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46 fs/cifs (smb3 client) changesets, 37 in fs/cifs and 9 for related helper functions and cleanup outside from Dave Howells and Willy

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Merge tag '6.3-rc-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs client updates from Steve French:
 "The largest subset of this is from David Howells et al: making the
  cifs/smb3 driver pass iov_iters down to the lowest layers, directly to
  the network transport rather than passing lists of pages around,
  helping multiple areas:

   - Pin user pages, thereby fixing the race between concurrent DIO read
     and fork, where the pages containing the DIO read buffer may end up
     belonging to the child process and not the parent - with the result
     that the parent might not see the retrieved data.

   - cifs shouldn't take refs on pages extracted from non-user-backed
     iterators (eg. KVEC). With these changes, cifs will apply the
     appropriate cleanup.

   - Making it easier to transition to using folios in cifs rather than
     pages by dealing with them through BVEC and XARRAY iterators.

   - Allowing cifs to use the new splice function

  The remainder are:

   - fixes for stable, including various fixes for uninitialized memory,
     wrong length field causing mount issue to very old servers,
     important directory lease fixes and reconnect fixes

   - cleanups (unused code removal, change one element array usage, and
     a change form strtobool to kstrtobool, and Kconfig cleanups)

   - SMBDIRECT (RDMA) fixes including iov_iter integration and UAF fixes

   - reconnect fixes

   - multichannel fixes, including improving channel allocation (to
     least used channel)

   - remove the last use of lock_page_killable by moving to
     folio_lock_killable"

* tag '6.3-rc-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6: (46 commits)
  update internal module version number for cifs.ko
  cifs: update ip_addr for ses only for primary chan setup
  cifs: use tcon allocation functions even for dummy tcon
  cifs: use the least loaded channel for sending requests
  cifs: DIO to/from KVEC-type iterators should now work
  cifs: Remove unused code
  cifs: Build the RDMA SGE list directly from an iterator
  cifs: Change the I/O paths to use an iterator rather than a page list
  cifs: Add a function to read into an iter from a socket
  cifs: Add some helper functions
  cifs: Add a function to Hash the contents of an iterator
  cifs: Add a function to build an RDMA SGE list from an iterator
  netfs: Add a function to extract an iterator into a scatterlist
  netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator
  cifs: Implement splice_read to pass down ITER_BVEC not ITER_PIPE
  splice: Export filemap/direct_splice_read()
  iov_iter: Add a function to extract a page list from an iterator
  iov_iter: Define flags to qualify page extraction.
  splice: Add a func to do a splice from an O_DIRECT file without ITER_PIPE
  splice: Add a func to do a splice from a buffered file without ITER_PIPE
  ...
This commit is contained in:
Linus Torvalds 2023-02-22 17:12:44 -08:00
parent d8ca6dbb8d fdbf807215
commit 307e14c039
50 changed files with 3243 additions and 2375 deletions
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6
block/bio.c
View file

@ -1236,11 +1236,11 @@ static int bio_iov_add_zone_append_page(struct bio *bio, struct page *page,
*/
static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
{
iov_iter_extraction_t extraction_flags = 0;
unsigned short nr_pages = bio->bi_max_vecs - bio->bi_vcnt;
unsigned short entries_left = bio->bi_max_vecs - bio->bi_vcnt;
struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt;
struct page **pages = (struct page **)bv;
unsigned int gup_flags = 0;
ssize_t size, left;
unsigned len, i = 0;
size_t offset, trim;
@ -1255,7 +1255,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
pages += entries_left * (PAGE_PTRS_PER_BVEC - 1);
if (bio->bi_bdev && blk_queue_pci_p2pdma(bio->bi_bdev->bd_disk->queue))
gup_flags |= FOLL_PCI_P2PDMA;
extraction_flags |= ITER_ALLOW_P2PDMA;
/*
* Each segment in the iov is required to be a block size multiple.
@ -1266,7 +1266,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
*/
size = iov_iter_get_pages(iter, pages,
UINT_MAX - bio->bi_iter.bi_size,
nr_pages, &offset, gup_flags);
nr_pages, &offset, extraction_flags);
if (unlikely(size <= 0))
return size ? size : -EFAULT;

8
block/blk-map.c
View file

@ -264,9 +264,9 @@ static struct bio *blk_rq_map_bio_alloc(struct request *rq,
static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
gfp_t gfp_mask)
{
iov_iter_extraction_t extraction_flags = 0;
unsigned int max_sectors = queue_max_hw_sectors(rq->q);
unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS);
unsigned int gup_flags = 0;
struct bio *bio;
int ret;
int j;
@ -279,7 +279,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
return -ENOMEM;
if (blk_queue_pci_p2pdma(rq->q))
gup_flags |= FOLL_PCI_P2PDMA;
extraction_flags |= ITER_ALLOW_P2PDMA;
while (iov_iter_count(iter)) {
struct page **pages, *stack_pages[UIO_FASTIOV];
@ -290,10 +290,10 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
if (nr_vecs <= ARRAY_SIZE(stack_pages)) {
pages = stack_pages;
bytes = iov_iter_get_pages(iter, pages, LONG_MAX,
nr_vecs, &offs, gup_flags);
nr_vecs, &offs, extraction_flags);
} else {
bytes = iov_iter_get_pages_alloc(iter, &pages,
LONG_MAX, &offs, gup_flags);
LONG_MAX, &offs, extraction_flags);
}
if (unlikely(bytes <= 0)) {
ret = bytes ? bytes : -EFAULT;

64
fs/cifs/Kconfig
View file

@ -18,40 +18,38 @@ config CIFS
select DNS_RESOLVER
select ASN1
select OID_REGISTRY
select NETFS_SUPPORT
help
This is the client VFS module for the SMB3 family of NAS protocols,
(including support for the most recent, most secure dialect SMB3.1.1)
as well as for earlier dialects such as SMB2.1, SMB2 and the older
Common Internet File System (CIFS) protocol. CIFS was the successor
to the original dialect, the Server Message Block (SMB) protocol, the
native file sharing mechanism for most early PC operating systems.
This is the client VFS module for the SMB3 family of network file
protocols (including the most recent, most secure dialect SMB3.1.1).
This module also includes support for earlier dialects such as
SMB2.1, SMB2 and even the old Common Internet File System (CIFS)
protocol. CIFS was the successor to the original network filesystem
protocol, Server Message Block (SMB ie SMB1), the native file sharing
mechanism for most early PC operating systems.
The SMB3 protocol is supported by most modern operating systems
and NAS appliances (e.g. Samba, Windows 10, Windows Server 2016,
MacOS) and even in the cloud (e.g. Microsoft Azure).
The older CIFS protocol was included in Windows NT4, 2000 and XP (and
later) as well by Samba (which provides excellent CIFS and SMB3
server support for Linux and many other operating systems). Use of
dialects older than SMB2.1 is often discouraged on public networks.
The SMB3.1.1 protocol is supported by most modern operating systems
and NAS appliances (e.g. Samba, Windows 11, Windows Server 2022,
MacOS) and even in the cloud (e.g. Microsoft Azure) and also by the
Linux kernel server, ksmbd. Support for the older CIFS protocol was
included in Windows NT4, 2000 and XP (and later). Use of dialects
older than SMB2.1 is often discouraged on public networks.
This module also provides limited support for OS/2 and Windows ME
and similar very old servers.
This module provides an advanced network file system client
for mounting to SMB3 (and CIFS) compliant servers. It includes
support for DFS (hierarchical name space), secure per-user
session establishment via Kerberos or NTLM or NTLMv2, RDMA
(smbdirect), advanced security features, per-share encryption,
directory leases, safe distributed caching (oplock), optional packet
signing, Unicode and other internationalization improvements.
This module provides an advanced network file system client for
mounting to SMB3 (and CIFS) compliant servers. It includes support
for DFS (hierarchical name space), secure per-user session
establishment via Kerberos or NTLMv2, RDMA (smbdirect), advanced
security features, per-share encryption, packet-signing, snapshots,
directory leases, safe distributed caching (leases), multichannel,
Unicode and other internationalization improvements.
In general, the default dialects, SMB3 and later, enable better
performance, security and features, than would be possible with CIFS.
Note that when mounting to Samba, due to the CIFS POSIX extensions,
CIFS mounts can provide slightly better POSIX compatibility
than SMB3 mounts. SMB2/SMB3 mount options are also
slightly simpler (compared to CIFS) due to protocol improvements.
If you need to mount to Samba, Azure, Macs or Windows from this machine, say Y.
If you need to mount to Samba, Azure, ksmbd, Macs or Windows from this
machine, say Y.
config CIFS_STATS2
bool "Extended statistics"
@ -111,12 +109,12 @@ config CIFS_POSIX
depends on CIFS && CIFS_ALLOW_INSECURE_LEGACY && CIFS_XATTR
help
Enabling this option will cause the cifs client to attempt to
negotiate a newer dialect with servers, such as Samba 3.0.5
or later, that optionally can handle more POSIX like (rather
than Windows like) file behavior. It also enables
support for POSIX ACLs (getfacl and setfacl) to servers
(such as Samba 3.10 and later) which can negotiate
CIFS POSIX ACL support. If unsure, say N.
negotiate a feature of the older cifs dialect with servers, such as
Samba 3.0.5 or later, that optionally can handle more POSIX like
(rather than Windows like) file behavior. It also enables support
for POSIX ACLs (getfacl and setfacl) to servers (such as Samba 3.10
and later) which can negotiate CIFS POSIX ACL support. This config
option is not needed when mounting with SMB3.1.1. If unsure, say N.
config CIFS_DEBUG
bool "Enable CIFS debugging routines"
@ -178,6 +176,8 @@ config CIFS_NFSD_EXPORT
help
Allows NFS server to export a CIFS mounted share (nfsd over cifs)
if CIFS
config CIFS_SMB_DIRECT
bool "SMB Direct support"
depends on CIFS=m && INFINIBAND && INFINIBAND_ADDR_TRANS || CIFS=y && INFINIBAND=y && INFINIBAND_ADDR_TRANS=y
@ -201,3 +201,5 @@ config CIFS_ROOT
Enables root file system support over SMB protocol.
Most people say N here.
endif

43
fs/cifs/cached_dir.c
View file

@ -14,6 +14,7 @@
static struct cached_fid *init_cached_dir(const char *path);
static void free_cached_dir(struct cached_fid *cfid);
static void smb2_close_cached_fid(struct kref *ref);
static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids,
const char *path,
@ -181,12 +182,13 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
rqst[0].rq_iov = open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
oparms.tcon = tcon;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_FILE);
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.fid = pfid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_FILE),
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.fid = pfid,
};
rc = SMB2_open_init(tcon, server,
&rqst[0], &oplock, &oparms, utf16_path);
@ -220,8 +222,8 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
}
goto oshr_free;
}
atomic_inc(&tcon->num_remote_opens);
cfid->tcon = tcon;
cfid->is_open = true;
o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
oparms.fid->persistent_fid = o_rsp->PersistentFileId;
@ -233,12 +235,12 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
if (o_rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
goto oshr_free;
smb2_parse_contexts(server, o_rsp,
&oparms.fid->epoch,
oparms.fid->lease_key, &oplock,
NULL, NULL);
if (!(oplock & SMB2_LEASE_READ_CACHING_HE))
goto oshr_free;
qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
goto oshr_free;
@ -259,9 +261,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
}
}
cfid->dentry = dentry;
cfid->tcon = tcon;
cfid->time = jiffies;
cfid->is_open = true;
cfid->has_lease = true;
oshr_free:
@ -271,7 +271,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
spin_lock(&cfids->cfid_list_lock);
if (!cfid->has_lease) {
if (rc && !cfid->has_lease) {
if (cfid->on_list) {
list_del(&cfid->entry);
cfid->on_list = false;
@ -280,13 +280,27 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
rc = -ENOENT;
}
spin_unlock(&cfids->cfid_list_lock);
if (!rc && !cfid->has_lease) {
/*
* We are guaranteed to have two references at this point.
* One for the caller and one for a potential lease.
* Release the Lease-ref so that the directory will be closed
* when the caller closes the cached handle.
*/
kref_put(&cfid->refcount, smb2_close_cached_fid);
}
if (rc) {
if (cfid->is_open)
SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
cfid->fid.volatile_fid);
free_cached_dir(cfid);
cfid = NULL;
}
if (rc == 0)
if (rc == 0) {
*ret_cfid = cfid;
atomic_inc(&tcon->num_remote_opens);
}
return rc;
}
@ -335,6 +349,7 @@ smb2_close_cached_fid(struct kref *ref)
if (cfid->is_open) {
SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
cfid->fid.volatile_fid);
atomic_dec(&cfid->tcon->num_remote_opens);
}
free_cached_dir(cfid);

11
fs/cifs/cifs_debug.c
View file

@ -8,6 +8,7 @@
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
@ -455,8 +456,10 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
spin_lock(&ses->iface_lock);
if (ses->iface_count)
seq_printf(m, "\n\n\tServer interfaces: %zu",
ses->iface_count);
seq_printf(m, "\n\n\tServer interfaces: %zu"
"\tLast updated: %lu seconds ago",
ses->iface_count,
(jiffies - ses->iface_last_update) / HZ);
j = 0;
list_for_each_entry(iface, &ses->iface_list,
iface_head) {
@ -787,7 +790,7 @@ static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
rc = get_user(c[0], buffer);
if (rc)
return rc;
if (strtobool(c, &bv) == 0)
if (kstrtobool(c, &bv) == 0)
cifsFYI = bv;
else if ((c[0] > '1') && (c[0] <= '9'))
cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
@ -947,7 +950,7 @@ static ssize_t cifs_security_flags_proc_write(struct file *file,
if (count < 3) {
/* single char or single char followed by null */
if (strtobool(flags_string, &bv) == 0) {
if (kstrtobool(flags_string, &bv) == 0) {
global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
return count;
} else if (!isdigit(flags_string[0])) {

2
fs/cifs/cifs_spnego.h
View file

@ -24,7 +24,7 @@ struct cifs_spnego_msg {
uint32_t flags;
uint32_t sesskey_len;
uint32_t secblob_len;
uint8_t data[1];
uint8_t data[];
};
#ifdef __KERNEL__

34
fs/cifs/cifsacl.c
View file

@ -1428,14 +1428,15 @@ static struct cifs_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb,
tcon = tlink_tcon(tlink);
xid = get_xid();
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = READ_CONTROL;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.disposition = FILE_OPEN;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = READ_CONTROL,
.create_options = cifs_create_options(cifs_sb, 0),
.disposition = FILE_OPEN,
.path = path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (!rc) {
@ -1494,14 +1495,15 @@ int set_cifs_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
else
access_flags = WRITE_DAC;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = access_flags;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.disposition = FILE_OPEN;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = access_flags,
.create_options = cifs_create_options(cifs_sb, 0),
.disposition = FILE_OPEN,
.path = path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (rc) {

172
fs/cifs/cifsencrypt.c
View file

@ -24,12 +24,156 @@
#include "../smbfs_common/arc4.h"
#include <crypto/aead.h>
/*
* Hash data from a BVEC-type iterator.
*/
static int cifs_shash_bvec(const struct iov_iter *iter, ssize_t maxsize,
struct shash_desc *shash)
{
const struct bio_vec *bv = iter->bvec;
unsigned long start = iter->iov_offset;
unsigned int i;
void *p;
int ret;
for (i = 0; i < iter->nr_segs; i++) {
size_t off, len;
len = bv[i].bv_len;
if (start >= len) {
start -= len;
continue;
}
len = min_t(size_t, maxsize, len - start);
off = bv[i].bv_offset + start;
p = kmap_local_page(bv[i].bv_page);
ret = crypto_shash_update(shash, p + off, len);
kunmap_local(p);
if (ret < 0)
return ret;
maxsize -= len;
if (maxsize <= 0)
break;
start = 0;
}
return 0;
}
/*
* Hash data from a KVEC-type iterator.
*/
static int cifs_shash_kvec(const struct iov_iter *iter, ssize_t maxsize,
struct shash_desc *shash)
{
const struct kvec *kv = iter->kvec;
unsigned long start = iter->iov_offset;
unsigned int i;
int ret;
for (i = 0; i < iter->nr_segs; i++) {
size_t len;
len = kv[i].iov_len;
if (start >= len) {
start -= len;
continue;
}
len = min_t(size_t, maxsize, len - start);
ret = crypto_shash_update(shash, kv[i].iov_base + start, len);
if (ret < 0)
return ret;
maxsize -= len;
if (maxsize <= 0)
break;
start = 0;
}
return 0;
}
/*
* Hash data from an XARRAY-type iterator.
*/
static ssize_t cifs_shash_xarray(const struct iov_iter *iter, ssize_t maxsize,
struct shash_desc *shash)
{
struct folio *folios[16], *folio;
unsigned int nr, i, j, npages;
loff_t start = iter->xarray_start + iter->iov_offset;
pgoff_t last, index = start / PAGE_SIZE;
ssize_t ret = 0;
size_t len, offset, foffset;
void *p;
if (maxsize == 0)
return 0;
last = (start + maxsize - 1) / PAGE_SIZE;
do {
nr = xa_extract(iter->xarray, (void **)folios, index, last,
ARRAY_SIZE(folios), XA_PRESENT);
if (nr == 0)
return -EIO;
for (i = 0; i < nr; i++) {
folio = folios[i];
npages = folio_nr_pages(folio);
foffset = start - folio_pos(folio);
offset = foffset % PAGE_SIZE;
for (j = foffset / PAGE_SIZE; j < npages; j++) {
len = min_t(size_t, maxsize, PAGE_SIZE - offset);
p = kmap_local_page(folio_page(folio, j));
ret = crypto_shash_update(shash, p, len);
kunmap_local(p);
if (ret < 0)
return ret;
maxsize -= len;
if (maxsize <= 0)
return 0;
start += len;
offset = 0;
index++;
}
}
} while (nr == ARRAY_SIZE(folios));
return 0;
}
/*
* Pass the data from an iterator into a hash.
*/
static int cifs_shash_iter(const struct iov_iter *iter, size_t maxsize,
struct shash_desc *shash)
{
if (maxsize == 0)
return 0;
switch (iov_iter_type(iter)) {
case ITER_BVEC:
return cifs_shash_bvec(iter, maxsize, shash);
case ITER_KVEC:
return cifs_shash_kvec(iter, maxsize, shash);
case ITER_XARRAY:
return cifs_shash_xarray(iter, maxsize, shash);
default:
pr_err("cifs_shash_iter(%u) unsupported\n", iov_iter_type(iter));
WARN_ON_ONCE(1);
return -EIO;
}
}
int __cifs_calc_signature(struct smb_rqst *rqst,
struct TCP_Server_Info *server, char *signature,
struct shash_desc *shash)
struct TCP_Server_Info *server, char *signature,
struct shash_desc *shash)
{
int i;
int rc;
ssize_t rc;
struct kvec *iov = rqst->rq_iov;
int n_vec = rqst->rq_nvec;
@ -61,25 +205,9 @@ int __cifs_calc_signature(struct smb_rqst *rqst,
}
}
/* now hash over the rq_pages array */
for (i = 0; i < rqst->rq_npages; i++) {
void *kaddr;
unsigned int len, offset;
rqst_page_get_length(rqst, i, &len, &offset);
kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
rc = crypto_shash_update(shash, kaddr, len);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with payload\n",
__func__);
kunmap(rqst->rq_pages[i]);
return rc;
}
kunmap(rqst->rq_pages[i]);
}
rc = cifs_shash_iter(&rqst->rq_iter, iov_iter_count(&rqst->rq_iter), shash);
if (rc < 0)
return rc;
rc = crypto_shash_final(shash, signature);
if (rc)

12
fs/cifs/cifsfs.c
View file

@ -1359,7 +1359,7 @@ const struct file_operations cifs_file_ops = {
.fsync = cifs_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.splice_read = cifs_splice_read,
.splice_write = iter_file_splice_write,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
@ -1379,7 +1379,7 @@ const struct file_operations cifs_file_strict_ops = {
.fsync = cifs_strict_fsync,
.flush = cifs_flush,
.mmap = cifs_file_strict_mmap,
.splice_read = generic_file_splice_read,
.splice_read = cifs_splice_read,
.splice_write = iter_file_splice_write,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
@ -1399,7 +1399,7 @@ const struct file_operations cifs_file_direct_ops = {
.fsync = cifs_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.splice_read = direct_splice_read,
.splice_write = iter_file_splice_write,
.unlocked_ioctl = cifs_ioctl,
.copy_file_range = cifs_copy_file_range,
@ -1417,7 +1417,7 @@ const struct file_operations cifs_file_nobrl_ops = {
.fsync = cifs_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.splice_read = cifs_splice_read,
.splice_write = iter_file_splice_write,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
@ -1435,7 +1435,7 @@ const struct file_operations cifs_file_strict_nobrl_ops = {
.fsync = cifs_strict_fsync,
.flush = cifs_flush,
.mmap = cifs_file_strict_mmap,
.splice_read = generic_file_splice_read,
.splice_read = cifs_splice_read,
.splice_write = iter_file_splice_write,
.llseek = cifs_llseek,
.unlocked_ioctl = cifs_ioctl,
@ -1453,7 +1453,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
.fsync = cifs_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.splice_read = direct_splice_read,
.splice_write = iter_file_splice_write,
.unlocked_ioctl = cifs_ioctl,
.copy_file_range = cifs_copy_file_range,

8
fs/cifs/cifsfs.h
View file

@ -100,6 +100,9 @@ extern ssize_t cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to);
extern ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from);
extern ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from);
extern ssize_t cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from);
extern ssize_t cifs_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags);
extern int cifs_flock(struct file *pfile, int cmd, struct file_lock *plock);
extern int cifs_lock(struct file *, int, struct file_lock *);
extern int cifs_fsync(struct file *, loff_t, loff_t, int);
@ -110,6 +113,9 @@ extern int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma);
extern const struct file_operations cifs_dir_ops;
extern int cifs_dir_open(struct inode *inode, struct file *file);
extern int cifs_readdir(struct file *file, struct dir_context *ctx);
extern void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len);
extern void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len);
extern void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len);
/* Functions related to dir entries */
extern const struct dentry_operations cifs_dentry_ops;
@ -154,5 +160,5 @@ extern const struct export_operations cifs_export_ops;
/* when changing internal version - update following two lines at same time */
#define SMB3_PRODUCT_BUILD 41
#define CIFS_VERSION "2.41"
#define CIFS_VERSION "2.42"
#endif /* _CIFSFS_H */

81
fs/cifs/cifsglob.h
View file

@ -78,10 +78,6 @@
#define SMB_ECHO_INTERVAL_MAX 600
#define SMB_ECHO_INTERVAL_DEFAULT 60
/* dns resolution intervals in seconds */
#define SMB_DNS_RESOLVE_INTERVAL_MIN 120
#define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600
/* smb multichannel query server interfaces interval in seconds */
#define SMB_INTERFACE_POLL_INTERVAL 600
@ -217,11 +213,9 @@ static inline void cifs_free_open_info(struct cifs_open_info_data *data)
struct smb_rqst {
struct kvec *rq_iov; /* array of kvecs */
unsigned int rq_nvec; /* number of kvecs in array */
struct page **rq_pages; /* pointer to array of page ptrs */
unsigned int rq_offset; /* the offset to the 1st page */
unsigned int rq_npages; /* number pages in array */
unsigned int rq_pagesz; /* page size to use */
unsigned int rq_tailsz; /* length of last page */
size_t rq_iter_size; /* Amount of data in ->rq_iter */
struct iov_iter rq_iter; /* Data iterator */
struct xarray rq_buffer; /* Page buffer for encryption */
};
struct mid_q_entry;
@ -692,7 +686,6 @@ struct TCP_Server_Info {
/* point to the SMBD connection if RDMA is used instead of socket */
struct smbd_connection *smbd_conn;
struct delayed_work echo; /* echo ping workqueue job */
struct delayed_work resolve; /* dns resolution workqueue job */
char *smallbuf; /* pointer to current "small" buffer */
char *bigbuf; /* pointer to current "big" buffer */
/* Total size of this PDU. Only valid from cifs_demultiplex_thread */
@ -1427,10 +1420,11 @@ struct cifs_aio_ctx {
struct cifsFileInfo *cfile;
struct bio_vec *bv;
loff_t pos;
unsigned int npages;
unsigned int nr_pinned_pages;
ssize_t rc;
unsigned int len;
unsigned int total_len;
unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */
bool should_dirty;
/*
* Indicates if this aio_ctx is for direct_io,
@ -1448,28 +1442,18 @@ struct cifs_readdata {
struct address_space *mapping;
struct cifs_aio_ctx *ctx;
__u64 offset;
ssize_t got_bytes;
unsigned int bytes;
unsigned int got_bytes;
pid_t pid;
int result;
struct work_struct work;
int (*read_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
unsigned int len);
int (*copy_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
struct iov_iter *iter);
struct iov_iter iter;
struct kvec iov[2];
struct TCP_Server_Info *server;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
struct cifs_credits credits;
unsigned int nr_pages;
struct page **pages;
};
/* asynchronous write support */
@ -1481,6 +1465,8 @@ struct cifs_writedata {
struct work_struct work;
struct cifsFileInfo *cfile;
struct cifs_aio_ctx *ctx;
struct iov_iter iter;
struct bio_vec *bv;
__u64 offset;
pid_t pid;
unsigned int bytes;
@ -1489,12 +1475,7 @@ struct cifs_writedata {
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
struct cifs_credits credits;
unsigned int nr_pages;
struct page **pages;
};
/*
@ -2154,15 +2135,21 @@ static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const
dst->FileNameLength = src->FileNameLength;
}
static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst,
int num_rqst,
const u8 *sig)
static inline int cifs_get_num_sgs(const struct smb_rqst *rqst,
int num_rqst,
const u8 *sig)
{
unsigned int len, skip;
unsigned int nents = 0;
unsigned long addr;
int i, j;
/*
* The first rqst has a transform header where the first 20 bytes are
* not part of the encrypted blob.
*/
skip = 20;
/* Assumes the first rqst has a transform header as the first iov.
* I.e.
* rqst[0].rq_iov[0] is transform header
@ -2170,14 +2157,22 @@ static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst,
* rqst[1+].rq_iov[0+] data to be encrypted/decrypted
*/
for (i = 0; i < num_rqst; i++) {
/*
* The first rqst has a transform header where the
* first 20 bytes are not part of the encrypted blob.
/* We really don't want a mixture of pinned and unpinned pages
* in the sglist. It's hard to keep track of which is what.
* Instead, we convert to a BVEC-type iterator higher up.
*/
if (WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter)))
return -EIO;
/* We also don't want to have any extra refs or pins to clean
* up in the sglist.
*/
if (WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter)))
return -EIO;
for (j = 0; j < rqst[i].rq_nvec; j++) {
struct kvec *iov = &rqst[i].rq_iov[j];
skip = (i == 0) && (j == 0) ? 20 : 0;
addr = (unsigned long)iov->iov_base + skip;
if (unlikely(is_vmalloc_addr((void *)addr))) {
len = iov->iov_len - skip;
@ -2186,8 +2181,9 @@ static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst,
} else {
nents++;
}
skip = 0;
}
nents += rqst[i].rq_npages;
nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX);
}
nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
return nents;
@ -2196,9 +2192,9 @@ static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst,
/* We can not use the normal sg_set_buf() as we will sometimes pass a
* stack object as buf.
*/
static inline struct scatterlist *cifs_sg_set_buf(struct scatterlist *sg,
const void *buf,
unsigned int buflen)
static inline void cifs_sg_set_buf(struct sg_table *sgtable,
const void *buf,
unsigned int buflen)
{
unsigned long addr = (unsigned long)buf;
unsigned int off = offset_in_page(addr);
@ -2208,16 +2204,17 @@ static inline struct scatterlist *cifs_sg_set_buf(struct scatterlist *sg,
do {
unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
sg_set_page(sg++, vmalloc_to_page((void *)addr), len, off);
sg_set_page(&sgtable->sgl[sgtable->nents++],
vmalloc_to_page((void *)addr), len, off);
off = 0;
addr += PAGE_SIZE;
buflen -= len;
} while (buflen);
} else {
sg_set_page(sg++, virt_to_page(addr), buflen, off);
sg_set_page(&sgtable->sgl[sgtable->nents++],
virt_to_page(addr), buflen, off);
}
return sg;
}
#endif /* _CIFS_GLOB_H */

98
fs/cifs/cifspdu.h
View file

@ -562,7 +562,7 @@ typedef union smb_com_session_setup_andx {
__u32 Reserved;
__le32 Capabilities; /* see below */
__le16 ByteCount;
unsigned char SecurityBlob[1]; /* followed by */
unsigned char SecurityBlob[]; /* followed by */
/* STRING NativeOS */
/* STRING NativeLanMan */
} __attribute__((packed)) req; /* NTLM request format (with
@ -582,7 +582,7 @@ typedef union smb_com_session_setup_andx {
__u32 Reserved; /* see below */
__le32 Capabilities;
__le16 ByteCount;
unsigned char CaseInsensitivePassword[1]; /* followed by: */
unsigned char CaseInsensitivePassword[]; /* followed by: */
/* unsigned char * CaseSensitivePassword; */
/* STRING AccountName */
/* STRING PrimaryDomain */
@ -599,7 +599,7 @@ typedef union smb_com_session_setup_andx {
__le16 Action; /* see below */
__le16 SecurityBlobLength;
__u16 ByteCount;
unsigned char SecurityBlob[1]; /* followed by */
unsigned char SecurityBlob[]; /* followed by */
/* unsigned char * NativeOS; */
/* unsigned char * NativeLanMan; */
/* unsigned char * PrimaryDomain; */
@ -618,7 +618,7 @@ typedef union smb_com_session_setup_andx {
__le16 PasswordLength;
__u32 Reserved; /* encrypt key len and offset */
__le16 ByteCount;
unsigned char AccountPassword[1]; /* followed by */
unsigned char AccountPassword[]; /* followed by */
/* STRING AccountName */
/* STRING PrimaryDomain */
/* STRING NativeOS */
@ -632,7 +632,7 @@ typedef union smb_com_session_setup_andx {
__le16 AndXOffset;
__le16 Action; /* see below */
__u16 ByteCount;
unsigned char NativeOS[1]; /* followed by */
unsigned char NativeOS[]; /* followed by */
/* unsigned char * NativeLanMan; */
/* unsigned char * PrimaryDomain; */
} __attribute__((packed)) old_resp; /* pre-NTLM (LANMAN2.1) response */
@ -693,7 +693,7 @@ typedef struct smb_com_tconx_req {
__le16 Flags; /* see below */
__le16 PasswordLength;
__le16 ByteCount;
unsigned char Password[1]; /* followed by */
unsigned char Password[]; /* followed by */
/* STRING Path *//* \\server\share name */
/* STRING Service */
} __attribute__((packed)) TCONX_REQ;
@ -705,7 +705,7 @@ typedef struct smb_com_tconx_rsp {
__le16 AndXOffset;
__le16 OptionalSupport; /* see below */
__u16 ByteCount;
unsigned char Service[1]; /* always ASCII, not Unicode */
unsigned char Service[]; /* always ASCII, not Unicode */
/* STRING NativeFileSystem */
} __attribute__((packed)) TCONX_RSP;
@ -718,7 +718,7 @@ typedef struct smb_com_tconx_rsp_ext {
__le32 MaximalShareAccessRights;
__le32 GuestMaximalShareAccessRights;
__u16 ByteCount;
unsigned char Service[1]; /* always ASCII, not Unicode */
unsigned char Service[]; /* always ASCII, not Unicode */
/* STRING NativeFileSystem */
} __attribute__((packed)) TCONX_RSP_EXT;
@ -755,14 +755,14 @@ typedef struct smb_com_echo_req {
struct smb_hdr hdr;
__le16 EchoCount;
__le16 ByteCount;
char Data[1];
char Data[];
} __attribute__((packed)) ECHO_REQ;
typedef struct smb_com_echo_rsp {
struct smb_hdr hdr;
__le16 SequenceNumber;
__le16 ByteCount;
char Data[1];
char Data[];
} __attribute__((packed)) ECHO_RSP;
typedef struct smb_com_logoff_andx_req {
@ -862,7 +862,7 @@ typedef struct smb_com_open_req { /* also handles create */
__le32 ImpersonationLevel;
__u8 SecurityFlags;
__le16 ByteCount;
char fileName[1];
char fileName[];
} __attribute__((packed)) OPEN_REQ;
/* open response: oplock levels */
@ -937,7 +937,7 @@ typedef struct smb_com_openx_req {
__le32 Timeout;
__le32 Reserved;
__le16 ByteCount; /* file name follows */
char fileName[1];
char fileName[];
} __attribute__((packed)) OPENX_REQ;
typedef struct smb_com_openx_rsp {
@ -1085,7 +1085,7 @@ typedef struct smb_com_lock_req {
__le16 NumberOfUnlocks;
__le16 NumberOfLocks;
__le16 ByteCount;
LOCKING_ANDX_RANGE Locks[1];
LOCKING_ANDX_RANGE Locks[];
} __attribute__((packed)) LOCK_REQ;
/* lock type */
@ -1114,7 +1114,7 @@ typedef struct smb_com_rename_req {
__le16 SearchAttributes; /* target file attributes */
__le16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII or Unicode */
unsigned char OldFileName[1];
unsigned char OldFileName[];
/* followed by __u8 BufferFormat2 */
/* followed by NewFileName */
} __attribute__((packed)) RENAME_REQ;
@ -1134,7 +1134,7 @@ typedef struct smb_com_copy_req {
__le16 Flags;
__le16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII or Unicode */
unsigned char OldFileName[1];
unsigned char OldFileName[];
/* followed by __u8 BufferFormat2 */
/* followed by NewFileName string */
} __attribute__((packed)) COPY_REQ;
@ -1144,7 +1144,7 @@ typedef struct smb_com_copy_rsp {
__le16 CopyCount; /* number of files copied */
__u16 ByteCount; /* may be zero */
__u8 BufferFormat; /* 0x04 - only present if errored file follows */
unsigned char ErrorFileName[1]; /* only present if error in copy */
unsigned char ErrorFileName[]; /* only present if error in copy */
} __attribute__((packed)) COPY_RSP;
#define CREATE_HARD_LINK 0x103
@ -1158,7 +1158,7 @@ typedef struct smb_com_nt_rename_req { /* A5 - also used for create hardlink */
__le32 ClusterCount;
__le16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII or Unicode */
unsigned char OldFileName[1];
unsigned char OldFileName[];
/* followed by __u8 BufferFormat2 */
/* followed by NewFileName */
} __attribute__((packed)) NT_RENAME_REQ;
@ -1173,7 +1173,7 @@ typedef struct smb_com_delete_file_req {
__le16 SearchAttributes;
__le16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII */
unsigned char fileName[1];
unsigned char fileName[];
} __attribute__((packed)) DELETE_FILE_REQ;
typedef struct smb_com_delete_file_rsp {
@ -1185,7 +1185,7 @@ typedef struct smb_com_delete_directory_req {
struct smb_hdr hdr; /* wct = 0 */
__le16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII */
unsigned char DirName[1];
unsigned char DirName[];
} __attribute__((packed)) DELETE_DIRECTORY_REQ;
typedef struct smb_com_delete_directory_rsp {
@ -1197,7 +1197,7 @@ typedef struct smb_com_create_directory_req {
struct smb_hdr hdr; /* wct = 0 */
__le16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII */
unsigned char DirName[1];
unsigned char DirName[];
} __attribute__((packed)) CREATE_DIRECTORY_REQ;
typedef struct smb_com_create_directory_rsp {
@ -1209,7 +1209,7 @@ typedef struct smb_com_query_information_req {
struct smb_hdr hdr; /* wct = 0 */
__le16 ByteCount; /* 1 + namelen + 1 */
__u8 BufferFormat; /* 4 = ASCII */
unsigned char FileName[1];
unsigned char FileName[];
} __attribute__((packed)) QUERY_INFORMATION_REQ;
typedef struct smb_com_query_information_rsp {
@ -1229,7 +1229,7 @@ typedef struct smb_com_setattr_req {
__le16 reserved[5]; /* must be zero */
__u16 ByteCount;
__u8 BufferFormat; /* 4 = ASCII */
unsigned char fileName[1];
unsigned char fileName[];
} __attribute__((packed)) SETATTR_REQ;
typedef struct smb_com_setattr_rsp {
@ -1311,7 +1311,7 @@ typedef struct smb_com_transaction_ioctl_req {
__u8 IsRootFlag; /* 1 = apply command to root of share (must be DFS) */
__le16 ByteCount;
__u8 Pad[3];
__u8 Data[1];
__u8 Data[];
} __attribute__((packed)) TRANSACT_IOCTL_REQ;
typedef struct smb_com_transaction_compr_ioctl_req {
@ -1430,7 +1430,7 @@ typedef struct smb_com_transaction_change_notify_req {
__u8 Reserved2;
__le16 ByteCount;
/* __u8 Pad[3];*/
/* __u8 Data[1];*/
/* __u8 Data[];*/
} __attribute__((packed)) TRANSACT_CHANGE_NOTIFY_REQ;
/* BB eventually change to use generic ntransact rsp struct
@ -1519,7 +1519,7 @@ struct cifs_quota_data {
__u64 space_used;
__u64 soft_limit;
__u64 hard_limit;
char sid[1]; /* variable size? */
char sid[]; /* variable size? */
} __attribute__((packed));
/* quota sub commands */
@ -1671,7 +1671,7 @@ typedef struct smb_com_transaction2_qpi_req {
__u8 Pad;
__le16 InformationLevel;
__u32 Reserved4;
char FileName[1];
char FileName[];
} __attribute__((packed)) TRANSACTION2_QPI_REQ;
typedef struct smb_com_transaction2_qpi_rsp {
@ -1704,7 +1704,7 @@ typedef struct smb_com_transaction2_spi_req {
__u16 Pad1;
__le16 InformationLevel;
__u32 Reserved4;
char FileName[1];
char FileName[];
} __attribute__((packed)) TRANSACTION2_SPI_REQ;
typedef struct smb_com_transaction2_spi_rsp {
@ -1809,7 +1809,7 @@ typedef struct smb_com_transaction2_ffirst_req {
__le16 SearchFlags;
__le16 InformationLevel;
__le32 SearchStorageType;
char FileName[1];
char FileName[];
} __attribute__((packed)) TRANSACTION2_FFIRST_REQ;
typedef struct smb_com_transaction2_ffirst_rsp {
@ -2020,7 +2020,7 @@ typedef struct smb_com_transaction2_get_dfs_refer_req {
perhaps?) followed by one byte pad - doesn't
seem to matter though */
__le16 MaxReferralLevel;
char RequestFileName[1];
char RequestFileName[];
} __attribute__((packed)) TRANSACTION2_GET_DFS_REFER_REQ;
#define DFS_VERSION cpu_to_le16(0x0003)
@ -2049,7 +2049,7 @@ struct get_dfs_referral_rsp {
__le16 PathConsumed;
__le16 NumberOfReferrals;
__le32 DFSFlags;
REFERRAL3 referrals[1]; /* array of level 3 dfs_referral structures */
REFERRAL3 referrals[]; /* array of level 3 dfs_referral structures */
/* followed by the strings pointed to by the referral structures */
} __packed;
@ -2284,7 +2284,10 @@ typedef struct { /* data block encoding of response to level 263 QPathInfo */
__le32 Mode;
__le32 AlignmentRequirement;
__le32 FileNameLength;
char FileName[1];
union {
char __pad;
DECLARE_FLEX_ARRAY(char, FileName);
};
} __attribute__((packed)) FILE_ALL_INFO; /* level 0x107 QPathInfo */
typedef struct {
@ -2322,7 +2325,7 @@ typedef struct {
} __attribute__((packed)) FILE_UNIX_BASIC_INFO; /* level 0x200 QPathInfo */
typedef struct {
char LinkDest[1];
DECLARE_FLEX_ARRAY(char, LinkDest);
} __attribute__((packed)) FILE_UNIX_LINK_INFO; /* level 0x201 QPathInfo */
/* The following three structures are needed only for
@ -2371,7 +2374,7 @@ struct file_end_of_file_info {
} __attribute__((packed)); /* size info, level 0x104 for set, 0x106 for query */
struct file_alt_name_info {
__u8 alt_name[1];
DECLARE_FLEX_ARRAY(__u8, alt_name);
} __attribute__((packed)); /* level 0x0108 */
struct file_stream_info {
@ -2480,7 +2483,10 @@ typedef struct {
__le32 NextEntryOffset;
__u32 ResumeKey; /* as with FileIndex - no need to convert */
FILE_UNIX_BASIC_INFO basic;
char FileName[1];
union {
char __pad;
DECLARE_FLEX_ARRAY(char, FileName);
};
} __attribute__((packed)) FILE_UNIX_INFO; /* level 0x202 */
typedef struct {
@ -2494,7 +2500,7 @@ typedef struct {
__le64 AllocationSize;
__le32 ExtFileAttributes;
__le32 FileNameLength;
char FileName[1];
char FileName[];
} __attribute__((packed)) FILE_DIRECTORY_INFO; /* level 0x101 FF resp data */
typedef struct {
@ -2509,7 +2515,7 @@ typedef struct {
__le32 ExtFileAttributes;
__le32 FileNameLength;
__le32 EaSize; /* length of the xattrs */
char FileName[1];
char FileName[];
} __attribute__((packed)) FILE_FULL_DIRECTORY_INFO; /* level 0x102 rsp data */
typedef struct {
@ -2526,7 +2532,7 @@ typedef struct {
__le32 EaSize; /* EA size */
__le32 Reserved;
__le64 UniqueId; /* inode num - le since Samba puts ino in low 32 bit*/
char FileName[1];
char FileName[];
} __attribute__((packed)) SEARCH_ID_FULL_DIR_INFO; /* level 0x105 FF rsp data */
typedef struct {
@ -2544,7 +2550,7 @@ typedef struct {
__u8 ShortNameLength;
__u8 Reserved;
__u8 ShortName[24];
char FileName[1];
char FileName[];
} __attribute__((packed)) FILE_BOTH_DIRECTORY_INFO; /* level 0x104 FFrsp data */
typedef struct {
@ -2559,7 +2565,7 @@ typedef struct {
__le32 AllocationSize;
__le16 Attributes; /* verify not u32 */
__u8 FileNameLength;
char FileName[1];
char FileName[];
} __attribute__((packed)) FIND_FILE_STANDARD_INFO; /* level 0x1 FF resp data */
@ -2569,21 +2575,11 @@ struct win_dev {
__le64 minor;
} __attribute__((packed));
struct gea {
unsigned char name_len;
char name[1];
} __attribute__((packed));
struct gealist {
unsigned long list_len;
struct gea list[1];
} __attribute__((packed));
struct fea {
unsigned char EA_flags;
__u8 name_len;
__le16 value_len;
char name[1];
char name[];
/* optionally followed by value */
} __attribute__((packed));
/* flags for _FEA.fEA */
@ -2591,7 +2587,7 @@ struct fea {
struct fealist {
__le32 list_len;
struct fea list[1];
struct fea list;
} __attribute__((packed));
/* used to hold an arbitrary blob of data */

11
fs/cifs/cifsproto.h
View file

@ -244,6 +244,9 @@ extern int cifs_read_page_from_socket(struct TCP_Server_Info *server,
struct page *page,
unsigned int page_offset,
unsigned int to_read);
int cifs_read_iter_from_socket(struct TCP_Server_Info *server,
struct iov_iter *iter,
unsigned int to_read);
extern int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb);
void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx);
int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx);
@ -581,10 +584,7 @@ int cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid);
int cifs_async_writev(struct cifs_writedata *wdata,
void (*release)(struct kref *kref));
void cifs_writev_complete(struct work_struct *work);
struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages,
work_func_t complete);
struct cifs_writedata *cifs_writedata_direct_alloc(struct page **pages,
work_func_t complete);
struct cifs_writedata *cifs_writedata_alloc(work_func_t complete);
void cifs_writedata_release(struct kref *refcount);
int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
@ -601,13 +601,10 @@ enum securityEnum cifs_select_sectype(struct TCP_Server_Info *,
enum securityEnum);
struct cifs_aio_ctx *cifs_aio_ctx_alloc(void);
void cifs_aio_ctx_release(struct kref *refcount);
int setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw);
int cifs_alloc_hash(const char *name, struct shash_desc **sdesc);
void cifs_free_hash(struct shash_desc **sdesc);
void rqst_page_get_length(const struct smb_rqst *rqst, unsigned int page,
unsigned int *len, unsigned int *offset);
struct cifs_chan *
cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server);
int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses);

48
fs/cifs/cifssmb.c
View file

@ -25,6 +25,7 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/uaccess.h>
#include "cifspdu.h"
#include "cifsfs.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
@ -1295,11 +1296,8 @@ cifs_readv_callback(struct mid_q_entry *mid)
struct TCP_Server_Info *server = tcon->ses->server;
struct smb_rqst rqst = { .rq_iov = rdata->iov,
.rq_nvec = 2,
.rq_pages = rdata->pages,
.rq_offset = rdata->page_offset,
.rq_npages = rdata->nr_pages,
.rq_pagesz = rdata->pagesz,
.rq_tailsz = rdata->tailsz };
.rq_iter_size = iov_iter_count(&rdata->iter),
.rq_iter = rdata->iter };
struct cifs_credits credits = { .value = 1, .instance = 0 };
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
@ -1738,11 +1736,8 @@ cifs_async_writev(struct cifs_writedata *wdata,
rqst.rq_iov = iov;
rqst.rq_nvec = 2;
rqst.rq_pages = wdata->pages;
rqst.rq_offset = wdata->page_offset;
rqst.rq_npages = wdata->nr_pages;
rqst.rq_pagesz = wdata->pagesz;
rqst.rq_tailsz = wdata->tailsz;
rqst.rq_iter = wdata->iter;
rqst.rq_iter_size = iov_iter_count(&wdata->iter);
cifs_dbg(FYI, "async write at %llu %u bytes\n",
wdata->offset, wdata->bytes);
@ -5373,14 +5368,15 @@ CIFSSMBSetPathInfoFB(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid fid;
int rc;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_WRITE;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.disposition = FILE_OPEN;
oparms.path = fileName;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_WRITE,
.create_options = cifs_create_options(cifs_sb, 0),
.disposition = FILE_OPEN,
.path = fileName,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (rc)
@ -5787,7 +5783,7 @@ CIFSSMBQAllEAs(const unsigned int xid, struct cifs_tcon *tcon,
/* account for ea list len */
list_len -= 4;
temp_fea = ea_response_data->list;
temp_fea = &ea_response_data->list;
temp_ptr = (char *)temp_fea;
while (list_len > 0) {
unsigned int name_len;
@ -5902,7 +5898,7 @@ CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
else
name_len = strnlen(ea_name, 255);
count = sizeof(*parm_data) + ea_value_len + name_len;
count = sizeof(*parm_data) + 1 + ea_value_len + name_len;
pSMB->MaxParameterCount = cpu_to_le16(2);
/* BB find max SMB PDU from sess */
pSMB->MaxDataCount = cpu_to_le16(1000);
@ -5926,14 +5922,14 @@ CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
byte_count = 3 /* pad */ + params + count;
pSMB->DataCount = cpu_to_le16(count);
parm_data->list_len = cpu_to_le32(count);
parm_data->list[0].EA_flags = 0;
parm_data->list.EA_flags = 0;
/* we checked above that name len is less than 255 */
parm_data->list[0].name_len = (__u8)name_len;
parm_data->list.name_len = (__u8)name_len;
/* EA names are always ASCII */
if (ea_name)
strncpy(parm_data->list[0].name, ea_name, name_len);
parm_data->list[0].name[name_len] = 0;
parm_data->list[0].value_len = cpu_to_le16(ea_value_len);
strncpy(parm_data->list.name, ea_name, name_len);
parm_data->list.name[name_len] = '\0';
parm_data->list.value_len = cpu_to_le16(ea_value_len);
/* caller ensures that ea_value_len is less than 64K but
we need to ensure that it fits within the smb */
@ -5941,7 +5937,7 @@ CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
negotiated SMB buffer size BB */
/* if (ea_value_len > buffer_size - 512 (enough for header)) */
if (ea_value_len)
memcpy(parm_data->list[0].name+name_len+1,
memcpy(parm_data->list.name + name_len + 1,
ea_value, ea_value_len);
pSMB->TotalDataCount = pSMB->DataCount;

179
fs/cifs/connect.c
View file

@ -79,8 +79,6 @@ static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
int len;
char *unc;
struct sockaddr_storage ss;
time64_t expiry, now;
unsigned long ttl = SMB_DNS_RESOLVE_INTERVAL_DEFAULT;
if (!server->hostname)
return -EINVAL;
@ -102,29 +100,19 @@ static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
ss = server->dstaddr;
spin_unlock(&server->srv_lock);
rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, &expiry);
rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, NULL);
kfree(unc);
if (rc < 0) {
cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
__func__, server->hostname, rc);
goto requeue_resolve;
} else {
spin_lock(&server->srv_lock);
memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
spin_unlock(&server->srv_lock);
rc = 0;
}
spin_lock(&server->srv_lock);
memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
spin_unlock(&server->srv_lock);
now = ktime_get_real_seconds();
if (expiry && expiry > now)
/* To make sure we don't use the cached entry, retry 1s */
ttl = max_t(unsigned long, expiry - now, SMB_DNS_RESOLVE_INTERVAL_MIN) + 1;
requeue_resolve:
cifs_dbg(FYI, "%s: next dns resolution scheduled for %lu seconds in the future\n",
__func__, ttl);
mod_delayed_work(cifsiod_wq, &server->resolve, (ttl * HZ));
return rc;
}
@ -148,26 +136,6 @@ static void smb2_query_server_interfaces(struct work_struct *work)
(SMB_INTERFACE_POLL_INTERVAL * HZ));
}
static void cifs_resolve_server(struct work_struct *work)
{
int rc;
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, resolve.work);
cifs_server_lock(server);
/*
* Resolve the hostname again to make sure that IP address is up-to-date.
*/
rc = reconn_set_ipaddr_from_hostname(server);
if (rc) {
cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
__func__, rc);
}
cifs_server_unlock(server);
}
/*
* Update the tcpStatus for the server.
* This is used to signal the cifsd thread to call cifs_reconnect
@ -766,6 +734,20 @@ cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
return cifs_readv_from_socket(server, &smb_msg);
}
int
cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
unsigned int to_read)
{
struct msghdr smb_msg = { .msg_iter = *iter };
int ret;
iov_iter_truncate(&smb_msg.msg_iter, to_read);
ret = cifs_readv_from_socket(server, &smb_msg);
if (ret > 0)
iov_iter_advance(iter, ret);
return ret;
}
static bool
is_smb_response(struct TCP_Server_Info *server, unsigned char type)
{
@ -926,7 +908,6 @@ static void clean_demultiplex_info(struct TCP_Server_Info *server)
spin_unlock(&server->srv_lock);
cancel_delayed_work_sync(&server->echo);
cancel_delayed_work_sync(&server->resolve);
spin_lock(&server->srv_lock);
server->tcpStatus = CifsExiting;
@ -1550,7 +1531,6 @@ cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
cifs_put_tcp_session(server->primary_server, from_reconnect);
cancel_delayed_work_sync(&server->echo);
cancel_delayed_work_sync(&server->resolve);
if (from_reconnect)
/*
@ -1656,7 +1636,6 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx,
INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
mutex_init(&tcp_ses->reconnect_mutex);
#ifdef CONFIG_CIFS_DFS_UPCALL
@ -1745,12 +1724,6 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx,
/* queue echo request delayed work */
queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
/* queue dns resolution delayed work */
cifs_dbg(FYI, "%s: next dns resolution scheduled for %d seconds in the future\n",
__func__, SMB_DNS_RESOLVE_INTERVAL_DEFAULT);
queue_delayed_work(cifsiod_wq, &tcp_ses->resolve, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT * HZ));
return tcp_ses;
out_err_crypto_release:
@ -2844,72 +2817,48 @@ ip_rfc1001_connect(struct TCP_Server_Info *server)
* negprot - BB check reconnection in case where second
* sessinit is sent but no second negprot
*/
struct rfc1002_session_packet *ses_init_buf;
unsigned int req_noscope_len;
struct smb_hdr *smb_buf;
struct rfc1002_session_packet req = {};
struct smb_hdr *smb_buf = (struct smb_hdr *)&req;
unsigned int len;
ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
GFP_KERNEL);
req.trailer.session_req.called_len = sizeof(req.trailer.session_req.called_name);
if (ses_init_buf) {
ses_init_buf->trailer.session_req.called_len = 32;
if (server->server_RFC1001_name[0] != 0)
rfc1002mangle(req.trailer.session_req.called_name,
server->server_RFC1001_name,
RFC1001_NAME_LEN_WITH_NULL);
else
rfc1002mangle(req.trailer.session_req.called_name,
DEFAULT_CIFS_CALLED_NAME,
RFC1001_NAME_LEN_WITH_NULL);
if (server->server_RFC1001_name[0] != 0)
rfc1002mangle(ses_init_buf->trailer.
session_req.called_name,
server->server_RFC1001_name,
RFC1001_NAME_LEN_WITH_NULL);
else
rfc1002mangle(ses_init_buf->trailer.
session_req.called_name,
DEFAULT_CIFS_CALLED_NAME,
RFC1001_NAME_LEN_WITH_NULL);
req.trailer.session_req.calling_len = sizeof(req.trailer.session_req.calling_name);
ses_init_buf->trailer.session_req.calling_len = 32;
/* calling name ends in null (byte 16) from old smb convention */
if (server->workstation_RFC1001_name[0] != 0)
rfc1002mangle(req.trailer.session_req.calling_name,
server->workstation_RFC1001_name,
RFC1001_NAME_LEN_WITH_NULL);
else
rfc1002mangle(req.trailer.session_req.calling_name,
"LINUX_CIFS_CLNT",
RFC1001_NAME_LEN_WITH_NULL);
/*
* calling name ends in null (byte 16) from old smb
* convention.
*/
if (server->workstation_RFC1001_name[0] != 0)
rfc1002mangle(ses_init_buf->trailer.
session_req.calling_name,
server->workstation_RFC1001_name,
RFC1001_NAME_LEN_WITH_NULL);
else
rfc1002mangle(ses_init_buf->trailer.
session_req.calling_name,
"LINUX_CIFS_CLNT",
RFC1001_NAME_LEN_WITH_NULL);
ses_init_buf->trailer.session_req.scope1 = 0;
ses_init_buf->trailer.session_req.scope2 = 0;
smb_buf = (struct smb_hdr *)ses_init_buf;
/* sizeof RFC1002_SESSION_REQUEST with no scopes */
req_noscope_len = sizeof(struct rfc1002_session_packet) - 2;
/* == cpu_to_be32(0x81000044) */
smb_buf->smb_buf_length =
cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | req_noscope_len);
rc = smb_send(server, smb_buf, 0x44);
kfree(ses_init_buf);
/*
* RFC1001 layer in at least one server
* requires very short break before negprot
* presumably because not expecting negprot
* to follow so fast. This is a simple
* solution that works without
* complicating the code and causes no
* significant slowing down on mount
* for everyone else
*/
usleep_range(1000, 2000);
}
/*
* else the negprot may still work without this
* even though malloc failed
* As per rfc1002, @len must be the number of bytes that follows the
* length field of a rfc1002 session request payload.
*/
len = sizeof(req) - offsetof(struct rfc1002_session_packet, trailer.session_req);
smb_buf->smb_buf_length = cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | len);
rc = smb_send(server, smb_buf, len);
/*
* RFC1001 layer in at least one server requires very short break before
* negprot presumably because not expecting negprot to follow so fast.
* This is a simple solution that works without complicating the code
* and causes no significant slowing down on mount for everyone else
*/
usleep_range(1000, 2000);
return rc;
}
@ -3760,16 +3709,12 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
struct nls_table *nls_info)
{
int rc = -ENOSYS;
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
struct TCP_Server_Info *pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&pserver->dstaddr;
struct sockaddr_in *addr = (struct sockaddr_in *)&pserver->dstaddr;
bool is_binding = false;
spin_lock(&ses->ses_lock);
if (server->dstaddr.ss_family == AF_INET6)
scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
else
scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
if (ses->ses_status != SES_GOOD &&
ses->ses_status != SES_NEW &&
ses->ses_status != SES_NEED_RECON) {
@ -3793,6 +3738,14 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
ses->ses_status = SES_IN_SETUP;
spin_unlock(&ses->ses_lock);
/* update ses ip_addr only for primary chan */
if (server == pserver) {
if (server->dstaddr.ss_family == AF_INET6)
scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
else
scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
}
if (!is_binding) {
ses->capabilities = server->capabilities;
if (!linuxExtEnabled)

19
fs/cifs/dir.c
View file

@ -304,15 +304,16 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned
if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
create_options |= CREATE_OPTION_READONLY;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = desired_access;
oparms.create_options = cifs_create_options(cifs_sb, create_options);
oparms.disposition = disposition;
oparms.path = full_path;
oparms.fid = fid;
oparms.reconnect = false;
oparms.mode = mode;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = desired_access,
.create_options = cifs_create_options(cifs_sb, create_options),
.disposition = disposition,
.path = full_path,
.fid = fid,
.mode = mode,
};
rc = server->ops->open(xid, &oparms, oplock, buf);
if (rc) {
cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);

1866
fs/cifs/file.c
View file

File diff suppressed because it is too large Load diff

20
fs/cifs/fscache.c
View file

@ -163,20 +163,16 @@ static int fscache_fallback_read_page(struct inode *inode, struct page *page)
/*
* Fallback page writing interface.
*/
static int fscache_fallback_write_page(struct inode *inode, struct page *page,
bool no_space_allocated_yet)
static int fscache_fallback_write_pages(struct inode *inode, loff_t start, size_t len,
bool no_space_allocated_yet)
{
struct netfs_cache_resources cres;
struct fscache_cookie *cookie = cifs_inode_cookie(inode);
struct iov_iter iter;
struct bio_vec bvec;
loff_t start = page_offset(page);
size_t len = PAGE_SIZE;
int ret;
memset(&cres, 0, sizeof(cres));
bvec_set_page(&bvec, page, PAGE_SIZE, 0);
iov_iter_bvec(&iter, ITER_SOURCE, &bvec, 1, PAGE_SIZE);
iov_iter_xarray(&iter, ITER_SOURCE, &inode->i_mapping->i_pages, start, len);
ret = fscache_begin_write_operation(&cres, cookie);
if (ret < 0)
@ -185,7 +181,7 @@ static int fscache_fallback_write_page(struct inode *inode, struct page *page,
ret = cres.ops->prepare_write(&cres, &start, &len, i_size_read(inode),
no_space_allocated_yet);
if (ret == 0)
ret = fscache_write(&cres, page_offset(page), &iter, NULL, NULL);
ret = fscache_write(&cres, start, &iter, NULL, NULL);
fscache_end_operation(&cres);
return ret;
}
@ -209,12 +205,12 @@ int __cifs_readpage_from_fscache(struct inode *inode, struct page *page)
return 0;
}
void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
void __cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len)
{
cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n",
__func__, cifs_inode_cookie(inode), page, inode);
cifs_dbg(FYI, "%s: (fsc: %p, p: %llx, l: %zx, i: %p)\n",
__func__, cifs_inode_cookie(inode), pos, len, inode);
fscache_fallback_write_page(inode, page, true);
fscache_fallback_write_pages(inode, pos, len, true);
}
/*

10
fs/cifs/fscache.h
View file

@ -90,7 +90,7 @@ static inline int cifs_fscache_query_occupancy(struct inode *inode,
}
extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
extern void __cifs_readpage_to_fscache(struct inode *pinode, struct page *ppage);
extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len);
static inline int cifs_readpage_from_fscache(struct inode *inode,
@ -101,11 +101,11 @@ static inline int cifs_readpage_from_fscache(struct inode *inode,
return -ENOBUFS;
}
static inline void cifs_readpage_to_fscache(struct inode *inode,
struct page *page)
static inline void cifs_readahead_to_fscache(struct inode *inode,
loff_t pos, size_t len)
{
if (cifs_inode_cookie(inode))
__cifs_readpage_to_fscache(inode, page);
__cifs_readahead_to_fscache(inode, pos, len);
}
#else /* CONFIG_CIFS_FSCACHE */
@ -141,7 +141,7 @@ cifs_readpage_from_fscache(struct inode *inode, struct page *page)
}
static inline
void cifs_readpage_to_fscache(struct inode *inode, struct page *page) {}
void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {}
#endif /* CONFIG_CIFS_FSCACHE */

53
fs/cifs/inode.c
View file

@ -508,14 +508,15 @@ cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_READ;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_READ,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_OPEN,
.path = path,
.fid = &fid,
};
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
@ -1518,14 +1519,15 @@ cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
goto out;
}
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.path = full_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = DELETE | FILE_WRITE_ATTRIBUTES,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_OPEN,
.path = full_path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (rc != 0)
@ -2112,15 +2114,16 @@ cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
if (to_dentry->d_parent != from_dentry->d_parent)
goto do_rename_exit;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
/* open the file to be renamed -- we need DELETE perms */
oparms.desired_access = DELETE;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.path = from_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
/* open the file to be renamed -- we need DELETE perms */
.desired_access = DELETE,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_OPEN,
.path = from_path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (rc == 0) {

66
fs/cifs/link.c
View file

@ -271,14 +271,15 @@ cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
int buf_type = CIFS_NO_BUFFER;
FILE_ALL_INFO file_info;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_READ;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_READ,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_OPEN,
.path = path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, &file_info);
if (rc)
@ -313,14 +314,15 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_open_parms oparms;
struct cifs_io_parms io_parms = {0};
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_WRITE;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_CREATE;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_WRITE,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_CREATE,
.path = path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (rc)
@ -355,13 +357,14 @@ smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
struct smb2_file_all_info *pfile_info = NULL;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_READ;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_READ,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_OPEN,
.fid = &fid,
};
utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
if (utf16_path == NULL)
@ -421,14 +424,15 @@ smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
if (!utf16_path)
return -ENOMEM;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_WRITE;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_CREATE;
oparms.fid = &fid;
oparms.reconnect = false;
oparms.mode = 0644;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_WRITE,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_CREATE,
.fid = &fid,
.mode = 0644,
};
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
NULL, NULL);

127
fs/cifs/misc.c
View file

@ -966,16 +966,22 @@ cifs_aio_ctx_release(struct kref *refcount)
/*
* ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
* which means that iov_iter_get_pages() was a success and thus that
* we have taken reference on pages.
* which means that iov_iter_extract_pages() was a success and thus
* that we may have references or pins on pages that we need to
* release.
*/
if (ctx->bv) {
unsigned i;
if (ctx->should_dirty || ctx->bv_need_unpin) {
unsigned int i;
for (i = 0; i < ctx->npages; i++) {
if (ctx->should_dirty)
set_page_dirty(ctx->bv[i].bv_page);
put_page(ctx->bv[i].bv_page);
for (i = 0; i < ctx->nr_pinned_pages; i++) {
struct page *page = ctx->bv[i].bv_page;
if (ctx->should_dirty)
set_page_dirty(page);
if (ctx->bv_need_unpin)
unpin_user_page(page);
}
}
kvfree(ctx->bv);
}
@ -983,94 +989,6 @@ cifs_aio_ctx_release(struct kref *refcount)
kfree(ctx);
}
#define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
int
setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw)
{
ssize_t rc;
unsigned int cur_npages;
unsigned int npages = 0;
unsigned int i;
size_t len;
size_t count = iov_iter_count(iter);
unsigned int saved_len;
size_t start;
unsigned int max_pages = iov_iter_npages(iter, INT_MAX);
struct page **pages = NULL;
struct bio_vec *bv = NULL;
if (iov_iter_is_kvec(iter)) {
memcpy(&ctx->iter, iter, sizeof(*iter));
ctx->len = count;
iov_iter_advance(iter, count);
return 0;
}
if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT)
bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL);
if (!bv) {
bv = vmalloc(array_size(max_pages, sizeof(*bv)));
if (!bv)
return -ENOMEM;
}
if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT)
pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
pages = vmalloc(array_size(max_pages, sizeof(*pages)));
if (!pages) {
kvfree(bv);
return -ENOMEM;
}
}
saved_len = count;
while (count && npages < max_pages) {
rc = iov_iter_get_pages2(iter, pages, count, max_pages, &start);
if (rc < 0) {
cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc);
break;
}
if (rc > count) {
cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc,
count);
break;
}
count -= rc;
rc += start;
cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE);
if (npages + cur_npages > max_pages) {
cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n",
npages + cur_npages, max_pages);
break;
}
for (i = 0; i < cur_npages; i++) {
len = rc > PAGE_SIZE ? PAGE_SIZE : rc;
bvec_set_page(&bv[npages + i], pages[i], len - start,
start);
rc -= len;
start = 0;
}
npages += cur_npages;
}
kvfree(pages);
ctx->bv = bv;
ctx->len = saved_len - count;
ctx->npages = npages;
iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len);
return 0;
}
/**
* cifs_alloc_hash - allocate hash and hash context together
* @name: The name of the crypto hash algo
@ -1128,25 +1046,6 @@ cifs_free_hash(struct shash_desc **sdesc)
*sdesc = NULL;
}
/**
* rqst_page_get_length - obtain the length and offset for a page in smb_rqst
* @rqst: The request descriptor
* @page: The index of the page to query
* @len: Where to store the length for this page:
* @offset: Where to store the offset for this page
*/
void rqst_page_get_length(const struct smb_rqst *rqst, unsigned int page,
unsigned int *len, unsigned int *offset)
{
*len = rqst->rq_pagesz;
*offset = (page == 0) ? rqst->rq_offset : 0;
if (rqst->rq_npages == 1 || page == rqst->rq_npages-1)
*len = rqst->rq_tailsz;
else if (page == 0)
*len = rqst->rq_pagesz - rqst->rq_offset;
}
void extract_unc_hostname(const char *unc, const char **h, size_t *len)
{
const char *end;

4
fs/cifs/ntlmssp.h
View file

@ -83,7 +83,7 @@ typedef struct _NEGOTIATE_MESSAGE {
SECURITY_BUFFER WorkstationName; /* RFC 1001 and ASCII */
/* SECURITY_BUFFER for version info not present since we
do not set the version is present flag */
char DomainString[0];
char DomainString[];
/* followed by WorkstationString */
} __attribute__((packed)) NEGOTIATE_MESSAGE, *PNEGOTIATE_MESSAGE;
@ -135,7 +135,7 @@ typedef struct _AUTHENTICATE_MESSAGE {
__le32 NegotiateFlags;
/* SECURITY_BUFFER for version info not present since we
do not set the version is present flag */
char UserString[0];
char UserString[];
} __attribute__((packed)) AUTHENTICATE_MESSAGE, *PAUTHENTICATE_MESSAGE;
/*

6
fs/cifs/readdir.c
View file

@ -495,7 +495,7 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
FIND_FILE_STANDARD_INFO *pfData;
pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 +
pfData->FileNameLength;
} else {
u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
@ -513,9 +513,9 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
new_entry, end_of_smb, old_entry);
return NULL;
} else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
(new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
(new_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 > end_of_smb))
|| ((level != SMB_FIND_FILE_INFO_STANDARD) &&
(new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
(new_entry + sizeof(FILE_DIRECTORY_INFO) + 1 > end_of_smb))) {
cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
new_entry, end_of_smb);
return NULL;

1
fs/cifs/sess.c
View file

@ -480,7 +480,6 @@ cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
* remove this channel
*/
cancel_delayed_work_sync(&chan->server->echo);
cancel_delayed_work_sync(&chan->server->resolve);
cancel_delayed_work_sync(&chan->server->reconnect);
spin_lock(&ses->chan_lock);

72
fs/cifs/smb1ops.c
View file

@ -576,14 +576,15 @@ static int cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
if (!(le32_to_cpu(fi.Attributes) & ATTR_REPARSE))
return 0;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.disposition = FILE_OPEN;
oparms.path = full_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = FILE_READ_ATTRIBUTES,
.create_options = cifs_create_options(cifs_sb, 0),
.disposition = FILE_OPEN,
.path = full_path,
.fid = &fid,
};
/* Need to check if this is a symbolic link or not */
tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
@ -823,14 +824,15 @@ smb_set_file_info(struct inode *inode, const char *full_path,
goto out;
}
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
oparms.disposition = FILE_OPEN;
oparms.path = full_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
.disposition = FILE_OPEN,
.path = full_path,
.fid = &fid,
};
cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
rc = CIFS_open(xid, &oparms, &oplock, NULL);
@ -998,15 +1000,16 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
goto out;
}
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.create_options = cifs_create_options(cifs_sb,
OPEN_REPARSE_POINT);
oparms.disposition = FILE_OPEN;
oparms.path = full_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = FILE_READ_ATTRIBUTES,
.create_options = cifs_create_options(cifs_sb,
OPEN_REPARSE_POINT),
.disposition = FILE_OPEN,
.path = full_path,
.fid = &fid,
};
rc = CIFS_open(xid, &oparms, &oplock, NULL);
if (rc)
@ -1115,15 +1118,16 @@ cifs_make_node(unsigned int xid, struct inode *inode,
cifs_dbg(FYI, "sfu compat create special file\n");
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_WRITE;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
CREATE_OPTION_SPECIAL);
oparms.disposition = FILE_CREATE;
oparms.path = full_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_WRITE,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
CREATE_OPTION_SPECIAL),
.disposition = FILE_CREATE,
.path = full_path,
.fid = &fid,
};
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;

2
fs/cifs/smb2file.c
View file

@ -35,7 +35,7 @@ static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov)
len = (u32)err->ErrorContextCount * (offsetof(struct smb2_error_context_rsp,
ErrorContextData) +
sizeof(struct smb2_symlink_err_rsp));
if (le32_to_cpu(err->ByteCount) < len || iov->iov_len < len + sizeof(*err))
if (le32_to_cpu(err->ByteCount) < len || iov->iov_len < len + sizeof(*err) + 1)
return ERR_PTR(-EINVAL);
p = (struct smb2_error_context_rsp *)err->ErrorData;

17
fs/cifs/smb2inode.c
View file

@ -105,14 +105,15 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
goto finished;
}
vars->oparms.tcon = tcon;
vars->oparms.desired_access = desired_access;
vars->oparms.disposition = create_disposition;
vars->oparms.create_options = cifs_create_options(cifs_sb, create_options);
vars->oparms.fid = &fid;
vars->oparms.reconnect = false;
vars->oparms.mode = mode;
vars->oparms.cifs_sb = cifs_sb;
vars->oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = desired_access,
.disposition = create_disposition,
.create_options = cifs_create_options(cifs_sb, create_options),
.fid = &fid,
.mode = mode,
.cifs_sb = cifs_sb,
};
rqst[num_rqst].rq_iov = &vars->open_iov[0];
rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;

2
fs/cifs/smb2misc.c
View file

@ -113,7 +113,7 @@ static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len,
} else if (nc_offset + 1 == non_ctxlen) {
cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n");
size_of_pad_before_neg_ctxts = 0;
} else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE)
} else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE + 1)
/* has padding, but no SPNEGO blob */
size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1;
else

602
fs/cifs/smb2ops.c
View file

@ -729,12 +729,13 @@ smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid fid;
struct cached_fid *cfid = NULL;
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = open_cached_dir(xid, tcon, "", cifs_sb, false, &cfid);
if (rc == 0)
@ -771,12 +772,13 @@ smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_open_parms oparms;
struct cifs_fid fid;
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
NULL, NULL);
@ -816,12 +818,13 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
if (!utf16_path)
return -ENOMEM;
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
&err_iov, &err_buftype);
@ -1097,13 +1100,13 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
rqst[0].rq_iov = open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
memset(&oparms, 0, sizeof(oparms));
oparms.tcon = tcon;
oparms.desired_access = FILE_WRITE_EA;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_WRITE_EA,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = SMB2_open_init(tcon, server,
&rqst[0], &oplock, &oparms, utf16_path);
@ -1453,12 +1456,12 @@ smb2_ioctl_query_info(const unsigned int xid,
rqst[0].rq_iov = &vars->open_iov[0];
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
memset(&oparms, 0, sizeof(oparms));
oparms.tcon = tcon;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, create_options);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, create_options),
.fid = &fid,
};
if (qi.flags & PASSTHRU_FSCTL) {
switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
@ -2088,12 +2091,13 @@ smb3_notify(const unsigned int xid, struct file *pfile,
}
tcon = cifs_sb_master_tcon(cifs_sb);
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
NULL);
@ -2159,12 +2163,13 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
rqst[0].rq_iov = open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = fid,
};
rc = SMB2_open_init(tcon, server,
&rqst[0], &oplock, &oparms, utf16_path);
@ -2490,12 +2495,13 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
rqst[0].rq_iov = open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
oparms.tcon = tcon;
oparms.desired_access = desired_access;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = desired_access,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = SMB2_open_init(tcon, server,
&rqst[0], &oplock, &oparms, utf16_path);
@ -2623,12 +2629,13 @@ smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
if (!tcon->posix_extensions)
return smb2_queryfs(xid, tcon, cifs_sb, buf);
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
};
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
NULL, NULL);
@ -2916,13 +2923,13 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
rqst[0].rq_iov = open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
memset(&oparms, 0, sizeof(oparms));
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, create_options);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, create_options),
.fid = &fid,
};
rc = SMB2_open_init(tcon, server,
&rqst[0], &oplock, &oparms, utf16_path);
@ -3056,13 +3063,13 @@ smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
rqst[0].rq_iov = open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
memset(&oparms, 0, sizeof(oparms));
oparms.tcon = tcon;
oparms.desired_access = FILE_READ_ATTRIBUTES;
oparms.disposition = FILE_OPEN;
oparms.create_options = cifs_create_options(cifs_sb, OPEN_REPARSE_POINT);
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = FILE_READ_ATTRIBUTES,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, OPEN_REPARSE_POINT),
.fid = &fid,
};
rc = SMB2_open_init(tcon, server,
&rqst[0], &oplock, &oparms, utf16_path);
@ -3196,17 +3203,20 @@ get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
return ERR_PTR(rc);
}
oparms.tcon = tcon;
oparms.desired_access = READ_CONTROL;
oparms.disposition = FILE_OPEN;
/*
* When querying an ACL, even if the file is a symlink we want to open
* the source not the target, and so the protocol requires that the
* client specify this flag when opening a reparse point
*/
oparms.create_options = cifs_create_options(cifs_sb, 0) | OPEN_REPARSE_POINT;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = READ_CONTROL,
.disposition = FILE_OPEN,
/*
* When querying an ACL, even if the file is a symlink
* we want to open the source not the target, and so
* the protocol requires that the client specify this
* flag when opening a reparse point
*/
.create_options = cifs_create_options(cifs_sb, 0) |
OPEN_REPARSE_POINT,
.fid = &fid,
};
if (info & SACL_SECINFO)
oparms.desired_access |= SYSTEM_SECURITY;
@ -3265,13 +3275,14 @@ set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
return rc;
}
oparms.tcon = tcon;
oparms.desired_access = access_flags;
oparms.create_options = cifs_create_options(cifs_sb, 0);
oparms.disposition = FILE_OPEN;
oparms.path = path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.desired_access = access_flags,
.create_options = cifs_create_options(cifs_sb, 0),
.disposition = FILE_OPEN,
.path = path,
.fid = &fid,
};
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
NULL, NULL);
@ -4227,8 +4238,8 @@ fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
static void *smb2_aead_req_alloc(struct crypto_aead *tfm, const struct smb_rqst *rqst,
int num_rqst, const u8 *sig, u8 **iv,
struct aead_request **req, struct scatterlist **sgl,
unsigned int *num_sgs)
struct aead_request **req, struct sg_table *sgt,
unsigned int *num_sgs, size_t *sensitive_size)
{
unsigned int req_size = sizeof(**req) + crypto_aead_reqsize(tfm);
unsigned int iv_size = crypto_aead_ivsize(tfm);
@ -4236,70 +4247,75 @@ static void *smb2_aead_req_alloc(struct crypto_aead *tfm, const struct smb_rqst
u8 *p;
*num_sgs = cifs_get_num_sgs(rqst, num_rqst, sig);
if (IS_ERR_VALUE((long)(int)*num_sgs))
return ERR_PTR(*num_sgs);
len = iv_size;
len += crypto_aead_alignmask(tfm) & ~(crypto_tfm_ctx_alignment() - 1);
len = ALIGN(len, crypto_tfm_ctx_alignment());
len += req_size;
len = ALIGN(len, __alignof__(struct scatterlist));
len += *num_sgs * sizeof(**sgl);
len += array_size(*num_sgs, sizeof(struct scatterlist));
*sensitive_size = len;
p = kmalloc(len, GFP_ATOMIC);
p = kvzalloc(len, GFP_NOFS);
if (!p)
return NULL;
return ERR_PTR(-ENOMEM);
*iv = (u8 *)PTR_ALIGN(p, crypto_aead_alignmask(tfm) + 1);
*req = (struct aead_request *)PTR_ALIGN(*iv + iv_size,
crypto_tfm_ctx_alignment());
*sgl = (struct scatterlist *)PTR_ALIGN((u8 *)*req + req_size,
__alignof__(struct scatterlist));
sgt->sgl = (struct scatterlist *)PTR_ALIGN((u8 *)*req + req_size,
__alignof__(struct scatterlist));
return p;
}
static void *smb2_get_aead_req(struct crypto_aead *tfm, const struct smb_rqst *rqst,
static void *smb2_get_aead_req(struct crypto_aead *tfm, struct smb_rqst *rqst,
int num_rqst, const u8 *sig, u8 **iv,
struct aead_request **req, struct scatterlist **sgl)
struct aead_request **req, struct scatterlist **sgl,
size_t *sensitive_size)
{
unsigned int off, len, skip;
struct scatterlist *sg;
unsigned int num_sgs;
unsigned long addr;
int i, j;
struct sg_table sgtable = {};
unsigned int skip, num_sgs, i, j;
ssize_t rc;
void *p;
p = smb2_aead_req_alloc(tfm, rqst, num_rqst, sig, iv, req, sgl, &num_sgs);
if (!p)
return NULL;
p = smb2_aead_req_alloc(tfm, rqst, num_rqst, sig, iv, req, &sgtable,
&num_sgs, sensitive_size);
if (IS_ERR(p))
return ERR_CAST(p);
sg_init_table(*sgl, num_sgs);
sg = *sgl;
sg_init_marker(sgtable.sgl, num_sgs);
/* Assumes the first rqst has a transform header as the first iov.
* I.e.
* rqst[0].rq_iov[0] is transform header
* rqst[0].rq_iov[1+] data to be encrypted/decrypted
* rqst[1+].rq_iov[0+] data to be encrypted/decrypted
/*
* The first rqst has a transform header where the
* first 20 bytes are not part of the encrypted blob.
*/
skip = 20;
for (i = 0; i < num_rqst; i++) {
/*
* The first rqst has a transform header where the
* first 20 bytes are not part of the encrypted blob.
*/
struct iov_iter *iter = &rqst[i].rq_iter;
size_t count = iov_iter_count(iter);
for (j = 0; j < rqst[i].rq_nvec; j++) {
struct kvec *iov = &rqst[i].rq_iov[j];
cifs_sg_set_buf(&sgtable,
rqst[i].rq_iov[j].iov_base + skip,
rqst[i].rq_iov[j].iov_len - skip);
skip = (i == 0) && (j == 0) ? 20 : 0;
addr = (unsigned long)iov->iov_base + skip;
len = iov->iov_len - skip;
sg = cifs_sg_set_buf(sg, (void *)addr, len);
}
for (j = 0; j < rqst[i].rq_npages; j++) {
rqst_page_get_length(&rqst[i], j, &len, &off);
sg_set_page(sg++, rqst[i].rq_pages[j], len, off);
/* See the above comment on the 'skip' assignment */
skip = 0;
}
sgtable.orig_nents = sgtable.nents;
rc = netfs_extract_iter_to_sg(iter, count, &sgtable,
num_sgs - sgtable.nents, 0);
iov_iter_revert(iter, rc);
sgtable.orig_nents = sgtable.nents;
}
cifs_sg_set_buf(sg, sig, SMB2_SIGNATURE_SIZE);
cifs_sg_set_buf(&sgtable, sig, SMB2_SIGNATURE_SIZE);
sg_mark_end(&sgtable.sgl[sgtable.nents - 1]);
*sgl = sgtable.sgl;
return p;
}
@ -4353,6 +4369,7 @@ crypt_message(struct TCP_Server_Info *server, int num_rqst,
struct crypto_aead *tfm;
unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
void *creq;
size_t sensitive_size;
rc = smb2_get_enc_key(server, le64_to_cpu(tr_hdr->SessionId), enc, key);
if (rc) {
@ -4386,9 +4403,10 @@ crypt_message(struct TCP_Server_Info *server, int num_rqst,
return rc;
}
creq = smb2_get_aead_req(tfm, rqst, num_rqst, sign, &iv, &req, &sg);
if (unlikely(!creq))
return -ENOMEM;
creq = smb2_get_aead_req(tfm, rqst, num_rqst, sign, &iv, &req, &sg,
&sensitive_size);
if (IS_ERR(creq))
return PTR_ERR(creq);
if (!enc) {
memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
@ -4416,22 +4434,35 @@ crypt_message(struct TCP_Server_Info *server, int num_rqst,
if (!rc && enc)
memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
kfree_sensitive(creq);
kvfree_sensitive(creq, sensitive_size);
return rc;
}
/*
* Clear a read buffer, discarding the folios which have XA_MARK_0 set.
*/
static void cifs_clear_xarray_buffer(struct xarray *buffer)
{
struct folio *folio;
XA_STATE(xas, buffer, 0);
rcu_read_lock();
xas_for_each_marked(&xas, folio, ULONG_MAX, XA_MARK_0) {
folio_put(folio);
}
rcu_read_unlock();
xa_destroy(buffer);
}
void
smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
{
int i, j;
int i;
for (i = 0; i < num_rqst; i++) {
if (rqst[i].rq_pages) {
for (j = rqst[i].rq_npages - 1; j >= 0; j--)
put_page(rqst[i].rq_pages[j]);
kfree(rqst[i].rq_pages);
}
}
for (i = 0; i < num_rqst; i++)
if (!xa_empty(&rqst[i].rq_buffer))
cifs_clear_xarray_buffer(&rqst[i].rq_buffer);
}
/*
@ -4451,9 +4482,8 @@ static int
smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
struct smb_rqst *new_rq, struct smb_rqst *old_rq)
{
struct page **pages;
struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
unsigned int npages;
struct page *page;
unsigned int orig_len = 0;
int i, j;
int rc = -ENOMEM;
@ -4461,40 +4491,45 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
for (i = 1; i < num_rqst; i++) {
struct smb_rqst *old = &old_rq[i - 1];
struct smb_rqst *new = &new_rq[i];
struct xarray *buffer = &new->rq_buffer;
size_t size = iov_iter_count(&old->rq_iter), seg, copied = 0;
orig_len += smb_rqst_len(server, old);
new->rq_iov = old->rq_iov;
new->rq_nvec = old->rq_nvec;
npages = old->rq_npages;
if (!npages)
continue;
xa_init(buffer);
pages = kmalloc_array(npages, sizeof(struct page *),
GFP_KERNEL);
if (!pages)
goto err_free;
if (size > 0) {
unsigned int npages = DIV_ROUND_UP(size, PAGE_SIZE);
new->rq_pages = pages;
new->rq_npages = npages;
new->rq_offset = old->rq_offset;
new->rq_pagesz = old->rq_pagesz;
new->rq_tailsz = old->rq_tailsz;
for (j = 0; j < npages; j++) {
void *o;
for (j = 0; j < npages; j++) {
pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
if (!pages[j])
goto err_free;
}
rc = -ENOMEM;
page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
if (!page)
goto err_free;
page->index = j;
o = xa_store(buffer, j, page, GFP_KERNEL);
if (xa_is_err(o)) {
rc = xa_err(o);
put_page(page);
goto err_free;
}
/* copy pages form the old */
for (j = 0; j < npages; j++) {
unsigned int offset, len;
xa_set_mark(buffer, j, XA_MARK_0);
rqst_page_get_length(new, j, &len, &offset);
memcpy_page(new->rq_pages[j], offset,
old->rq_pages[j], offset, len);
seg = min_t(size_t, size - copied, PAGE_SIZE);
if (copy_page_from_iter(page, 0, seg, &old->rq_iter) != seg) {
rc = -EFAULT;
goto err_free;
}
copied += seg;
}
iov_iter_xarray(&new->rq_iter, ITER_SOURCE,
buffer, 0, size);
new->rq_iter_size = size;
}
}
@ -4523,12 +4558,12 @@ smb3_is_transform_hdr(void *buf)
static int
decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
unsigned int buf_data_size, struct page **pages,
unsigned int npages, unsigned int page_data_size,
unsigned int buf_data_size, struct iov_iter *iter,
bool is_offloaded)
{
struct kvec iov[2];
struct smb_rqst rqst = {NULL};
size_t iter_size = 0;
int rc;
iov[0].iov_base = buf;
@ -4538,10 +4573,11 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
rqst.rq_iov = iov;
rqst.rq_nvec = 2;
rqst.rq_pages = pages;
rqst.rq_npages = npages;
rqst.rq_pagesz = PAGE_SIZE;
rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
if (iter) {
rqst.rq_iter = *iter;
rqst.rq_iter_size = iov_iter_count(iter);
iter_size = iov_iter_count(iter);
}
rc = crypt_message(server, 1, &rqst, 0);
cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
@ -4552,73 +4588,37 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
memmove(buf, iov[1].iov_base, buf_data_size);
if (!is_offloaded)
server->total_read = buf_data_size + page_data_size;
server->total_read = buf_data_size + iter_size;
return rc;
}
static int
read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
unsigned int npages, unsigned int len)
cifs_copy_pages_to_iter(struct xarray *pages, unsigned int data_size,
unsigned int skip, struct iov_iter *iter)
{
int i;
int length;
struct page *page;
unsigned long index;
for (i = 0; i < npages; i++) {
struct page *page = pages[i];
size_t n;
xa_for_each(pages, index, page) {
size_t n, len = min_t(unsigned int, PAGE_SIZE - skip, data_size);
n = len;
if (len >= PAGE_SIZE) {
/* enough data to fill the page */
n = PAGE_SIZE;
len -= n;
} else {
zero_user(page, len, PAGE_SIZE - len);
len = 0;
n = copy_page_to_iter(page, skip, len, iter);
if (n != len) {
cifs_dbg(VFS, "%s: something went wrong\n", __func__);
return -EIO;
}
length = cifs_read_page_from_socket(server, page, 0, n);
if (length < 0)
return length;
server->total_read += length;
data_size -= n;
skip = 0;
}
return 0;
}
static int
init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
unsigned int cur_off, struct bio_vec **page_vec)
{
struct bio_vec *bvec;
int i;
bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
if (!bvec)
return -ENOMEM;
for (i = 0; i < npages; i++) {
bvec_set_page(&bvec[i], pages[i],
min_t(unsigned int, PAGE_SIZE, data_size),
i == 0 ? cur_off : 0);
data_size -= bvec[i].bv_len;
}
if (data_size != 0) {
cifs_dbg(VFS, "%s: something went wrong\n", __func__);
kfree(bvec);
return -EIO;
}
*page_vec = bvec;
return 0;
}
static int
handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
char *buf, unsigned int buf_len, struct page **pages,
unsigned int npages, unsigned int page_data_size,
bool is_offloaded)
char *buf, unsigned int buf_len, struct xarray *pages,
unsigned int pages_len, bool is_offloaded)
{
unsigned int data_offset;
unsigned int data_len;
@ -4627,9 +4627,6 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
unsigned int pad_len;
struct cifs_readdata *rdata = mid->callback_data;
struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
struct bio_vec *bvec = NULL;
struct iov_iter iter;
struct kvec iov;
int length;
bool use_rdma_mr = false;
@ -4718,7 +4715,7 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
return 0;
}
if (data_len > page_data_size - pad_len) {
if (data_len > pages_len - pad_len) {
/* data_len is corrupt -- discard frame */
rdata->result = -EIO;
if (is_offloaded)
@ -4728,8 +4725,9 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
return 0;
}
rdata->result = init_read_bvec(pages, npages, page_data_size,
cur_off, &bvec);
/* Copy the data to the output I/O iterator. */
rdata->result = cifs_copy_pages_to_iter(pages, pages_len,
cur_off, &rdata->iter);
if (rdata->result != 0) {
if (is_offloaded)
mid->mid_state = MID_RESPONSE_MALFORMED;
@ -4737,14 +4735,16 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
dequeue_mid(mid, rdata->result);
return 0;
}
rdata->got_bytes = pages_len;
iov_iter_bvec(&iter, ITER_SOURCE, bvec, npages, data_len);
} else if (buf_len >= data_offset + data_len) {
/* read response payload is in buf */
WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
iov.iov_base = buf + data_offset;
iov.iov_len = data_len;
iov_iter_kvec(&iter, ITER_SOURCE, &iov, 1, data_len);
WARN_ONCE(pages && !xa_empty(pages),
"read data can be either in buf or in pages");
length = copy_to_iter(buf + data_offset, data_len, &rdata->iter);
if (length < 0)
return length;
rdata->got_bytes = data_len;
} else {
/* read response payload cannot be in both buf and pages */
WARN_ONCE(1, "buf can not contain only a part of read data");
@ -4756,26 +4756,18 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
return 0;
}
length = rdata->copy_into_pages(server, rdata, &iter);
kfree(bvec);
if (length < 0)
return length;
if (is_offloaded)
mid->mid_state = MID_RESPONSE_RECEIVED;
else
dequeue_mid(mid, false);
return length;
return 0;
}
struct smb2_decrypt_work {
struct work_struct decrypt;
struct TCP_Server_Info *server;
struct page **ppages;
struct xarray buffer;
char *buf;
unsigned int npages;
unsigned int len;
};
@ -4784,11 +4776,13 @@ static void smb2_decrypt_offload(struct work_struct *work)
{
struct smb2_decrypt_work *dw = container_of(work,
struct smb2_decrypt_work, decrypt);
int i, rc;
int rc;
struct mid_q_entry *mid;
struct iov_iter iter;
iov_iter_xarray(&iter, ITER_DEST, &dw->buffer, 0, dw->len);
rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size,
dw->ppages, dw->npages, dw->len, true);
&iter, true);
if (rc) {
cifs_dbg(VFS, "error decrypting rc=%d\n", rc);
goto free_pages;
@ -4802,7 +4796,7 @@ static void smb2_decrypt_offload(struct work_struct *work)
mid->decrypted = true;
rc = handle_read_data(dw->server, mid, dw->buf,
dw->server->vals->read_rsp_size,
dw->ppages, dw->npages, dw->len,
&dw->buffer, dw->len,
true);
if (rc >= 0) {
#ifdef CONFIG_CIFS_STATS2
@ -4835,10 +4829,7 @@ static void smb2_decrypt_offload(struct work_struct *work)
}
free_pages:
for (i = dw->npages-1; i >= 0; i--)
put_page(dw->ppages[i]);
kfree(dw->ppages);
cifs_clear_xarray_buffer(&dw->buffer);
cifs_small_buf_release(dw->buf);
kfree(dw);
}
@ -4848,47 +4839,66 @@ static int
receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
int *num_mids)
{
struct page *page;
char *buf = server->smallbuf;
struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
unsigned int npages;
struct page **pages;
unsigned int len;
struct iov_iter iter;
unsigned int len, npages;
unsigned int buflen = server->pdu_size;
int rc;
int i = 0;
struct smb2_decrypt_work *dw;
dw = kzalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
if (!dw)
return -ENOMEM;
xa_init(&dw->buffer);
INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
dw->server = server;
*num_mids = 1;
len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
if (rc < 0)
return rc;
goto free_dw;
server->total_read += rc;
len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
server->vals->read_rsp_size;
dw->len = len;
npages = DIV_ROUND_UP(len, PAGE_SIZE);
pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto discard_data;
}
rc = -ENOMEM;
for (; i < npages; i++) {
pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
if (!pages[i]) {
rc = -ENOMEM;
void *old;
page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
if (!page)
goto discard_data;
page->index = i;
old = xa_store(&dw->buffer, i, page, GFP_KERNEL);
if (xa_is_err(old)) {
rc = xa_err(old);
put_page(page);
goto discard_data;
}
xa_set_mark(&dw->buffer, i, XA_MARK_0);
}
/* read read data into pages */
rc = read_data_into_pages(server, pages, npages, len);
if (rc)
goto free_pages;
iov_iter_xarray(&iter, ITER_DEST, &dw->buffer, 0, npages * PAGE_SIZE);
/* Read the data into the buffer and clear excess bufferage. */
rc = cifs_read_iter_from_socket(server, &iter, dw->len);
if (rc < 0)
goto discard_data;
server->total_read += rc;
if (rc < npages * PAGE_SIZE)
iov_iter_zero(npages * PAGE_SIZE - rc, &iter);
iov_iter_revert(&iter, npages * PAGE_SIZE);
iov_iter_truncate(&iter, dw->len);
rc = cifs_discard_remaining_data(server);
if (rc)
@ -4901,39 +4911,28 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
if ((server->min_offload) && (server->in_flight > 1) &&
(server->pdu_size >= server->min_offload)) {
dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
if (dw == NULL)
goto non_offloaded_decrypt;
dw->buf = server->smallbuf;
server->smallbuf = (char *)cifs_small_buf_get();
INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
dw->npages = npages;
dw->server = server;
dw->ppages = pages;
dw->len = len;
queue_work(decrypt_wq, &dw->decrypt);
*num_mids = 0; /* worker thread takes care of finding mid */
return -1;
}
non_offloaded_decrypt:
rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
pages, npages, len, false);
&iter, false);
if (rc)
goto free_pages;
*mid = smb2_find_mid(server, buf);
if (*mid == NULL)
if (*mid == NULL) {
cifs_dbg(FYI, "mid not found\n");
else {
} else {
cifs_dbg(FYI, "mid found\n");
(*mid)->decrypted = true;
rc = handle_read_data(server, *mid, buf,
server->vals->read_rsp_size,
pages, npages, len, false);
&dw->buffer, dw->len, false);
if (rc >= 0) {
if (server->ops->is_network_name_deleted) {
server->ops->is_network_name_deleted(buf,
@ -4943,9 +4942,9 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
}
free_pages:
for (i = i - 1; i >= 0; i--)
put_page(pages[i]);
kfree(pages);
cifs_clear_xarray_buffer(&dw->buffer);
free_dw:
kfree(dw);
return rc;
discard_data:
cifs_discard_remaining_data(server);
@ -4983,7 +4982,7 @@ receive_encrypted_standard(struct TCP_Server_Info *server,
server->total_read += length;
buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false);
length = decrypt_raw_data(server, buf, buf_size, NULL, false);
if (length)
return length;
@ -5082,7 +5081,7 @@ smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
return handle_read_data(server, mid, buf, server->pdu_size,
NULL, 0, 0, false);
NULL, 0, false);
}
static int
@ -5134,15 +5133,16 @@ smb2_make_node(unsigned int xid, struct inode *inode,
cifs_dbg(FYI, "sfu compat create special file\n");
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_WRITE;
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
CREATE_OPTION_SPECIAL);
oparms.disposition = FILE_CREATE;
oparms.path = full_path;
oparms.fid = &fid;
oparms.reconnect = false;
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = GENERIC_WRITE,
.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
CREATE_OPTION_SPECIAL),
.disposition = FILE_CREATE,
.path = full_path,
.fid = &fid,
};
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
@ -5629,7 +5629,7 @@ struct smb_version_values smb20_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -5651,7 +5651,7 @@ struct smb_version_values smb21_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -5672,7 +5672,7 @@ struct smb_version_values smb3any_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -5693,7 +5693,7 @@ struct smb_version_values smbdefault_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -5714,7 +5714,7 @@ struct smb_version_values smb30_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -5735,7 +5735,7 @@ struct smb_version_values smb302_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -5756,7 +5756,7 @@ struct smb_version_values smb311_values = {
.header_size = sizeof(struct smb2_hdr),
.header_preamble_size = 0,
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,

291
fs/cifs/smb2pdu.c
View file

@ -139,6 +139,66 @@ smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
return;
}
static int wait_for_server_reconnect(struct TCP_Server_Info *server,
__le16 smb2_command, bool retry)
{
int timeout = 10;
int rc;
spin_lock(&server->srv_lock);
if (server->tcpStatus != CifsNeedReconnect) {
spin_unlock(&server->srv_lock);
return 0;
}
timeout *= server->nr_targets;
spin_unlock(&server->srv_lock);
/*
* Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
* here since they are implicitly done when session drops.
*/
switch (smb2_command) {
/*
* BB Should we keep oplock break and add flush to exceptions?
*/
case SMB2_TREE_DISCONNECT:
case SMB2_CANCEL:
case SMB2_CLOSE:
case SMB2_OPLOCK_BREAK:
return -EAGAIN;
}
/*
* Give demultiplex thread up to 10 seconds to each target available for
* reconnect -- should be greater than cifs socket timeout which is 7
* seconds.
*
* On "soft" mounts we wait once. Hard mounts keep retrying until
* process is killed or server comes back on-line.
*/
do {
rc = wait_event_interruptible_timeout(server->response_q,
(server->tcpStatus != CifsNeedReconnect),
timeout * HZ);
if (rc < 0) {
cifs_dbg(FYI, "%s: aborting reconnect due to received signal\n",
__func__);
return -ERESTARTSYS;
}
/* are we still trying to reconnect? */
spin_lock(&server->srv_lock);
if (server->tcpStatus != CifsNeedReconnect) {
spin_unlock(&server->srv_lock);
return 0;
}
spin_unlock(&server->srv_lock);
} while (retry);
cifs_dbg(FYI, "%s: gave up waiting on reconnect\n", __func__);
return -EHOSTDOWN;
}
static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server)
@ -146,7 +206,6 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
int rc = 0;
struct nls_table *nls_codepage;
struct cifs_ses *ses;
int retries;
/*
* SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
@ -184,61 +243,11 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
(!tcon->ses->server) || !server)
return -EIO;
rc = wait_for_server_reconnect(server, smb2_command, tcon->retry);
if (rc)
return rc;
ses = tcon->ses;
retries = server->nr_targets;
/*
* Give demultiplex thread up to 10 seconds to each target available for
* reconnect -- should be greater than cifs socket timeout which is 7
* seconds.
*/
while (server->tcpStatus == CifsNeedReconnect) {
/*
* Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
* here since they are implicitly done when session drops.
*/
switch (smb2_command) {
/*
* BB Should we keep oplock break and add flush to exceptions?
*/
case SMB2_TREE_DISCONNECT:
case SMB2_CANCEL:
case SMB2_CLOSE:
case SMB2_OPLOCK_BREAK:
return -EAGAIN;
}
rc = wait_event_interruptible_timeout(server->response_q,
(server->tcpStatus != CifsNeedReconnect),
10 * HZ);
if (rc < 0) {
cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
__func__);
return -ERESTARTSYS;
}
/* are we still trying to reconnect? */
spin_lock(&server->srv_lock);
if (server->tcpStatus != CifsNeedReconnect) {
spin_unlock(&server->srv_lock);
break;
}
spin_unlock(&server->srv_lock);
if (retries && --retries)
continue;
/*
* on "soft" mounts we wait once. Hard mounts keep
* retrying until process is killed or server comes
* back on-line
*/
if (!tcon->retry) {
cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
return -EHOSTDOWN;
}
retries = server->nr_targets;
}
spin_lock(&ses->chan_lock);
if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
@ -1364,7 +1373,7 @@ SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
/* Testing shows that buffer offset must be at location of Buffer[0] */
req->SecurityBufferOffset =
cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
cpu_to_le16(sizeof(struct smb2_sess_setup_req));
req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
memset(&rqst, 0, sizeof(struct smb_rqst));
@ -1858,12 +1867,12 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
if (unc_path == NULL)
return -ENOMEM;
unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
unc_path_len *= 2;
if (unc_path_len < 2) {
unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
if (unc_path_len <= 0) {
kfree(unc_path);
return -EINVAL;
}
unc_path_len *= 2;
/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
tcon->tid = 0;
@ -1883,9 +1892,8 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
iov[0].iov_len = total_len - 1;
/* Testing shows that buffer offset must be at location of Buffer[0] */
req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
- 1 /* pad */);
req->PathLength = cpu_to_le16(unc_path_len - 2);
req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
req->PathLength = cpu_to_le16(unc_path_len);
iov[1].iov_base = unc_path;
iov[1].iov_len = unc_path_len;
@ -3764,7 +3772,7 @@ SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
ses->Suid, (u8)watch_tree, completion_filter);
/* validate that notify information is plausible */
if ((rsp_iov.iov_base == NULL) ||
(rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp)))
(rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
goto cnotify_exit;
smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
@ -3898,7 +3906,7 @@ void smb2_reconnect_server(struct work_struct *work)
goto done;
/* allocate a dummy tcon struct used for reconnect */
tcon = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
tcon = tconInfoAlloc();
if (!tcon) {
resched = true;
list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
@ -3921,7 +3929,7 @@ void smb2_reconnect_server(struct work_struct *work)
list_del_init(&ses->rlist);
cifs_put_smb_ses(ses);
}
kfree(tcon);
tconInfoFree(tcon);
done:
cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
@ -4054,6 +4062,36 @@ SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
return rc;
}
#ifdef CONFIG_CIFS_SMB_DIRECT
static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
{
struct TCP_Server_Info *server = io_parms->server;
struct cifs_tcon *tcon = io_parms->tcon;
/* we can only offload if we're connected */
if (!server || !tcon)
return false;
/* we can only offload on an rdma connection */
if (!server->rdma || !server->smbd_conn)
return false;
/* we don't support signed offload yet */
if (server->sign)
return false;
/* we don't support encrypted offload yet */
if (smb3_encryption_required(tcon))
return false;
/* offload also has its overhead, so only do it if desired */
if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
return false;
return true;
}
#endif /* CONFIG_CIFS_SMB_DIRECT */
/*
* To form a chain of read requests, any read requests after the first should
* have the end_of_chain boolean set to true.
@ -4097,16 +4135,12 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
* If we want to do a RDMA write, fill in and append
* smbd_buffer_descriptor_v1 to the end of read request
*/
if (server->rdma && rdata && !server->sign &&
rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
if (smb3_use_rdma_offload(io_parms)) {
struct smbd_buffer_descriptor_v1 *v1;
bool need_invalidate = server->dialect == SMB30_PROT_ID;
rdata->mr = smbd_register_mr(
server->smbd_conn, rdata->pages,
rdata->nr_pages, rdata->page_offset,
rdata->tailsz, true, need_invalidate);
rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter,
true, need_invalidate);
if (!rdata->mr)
return -EAGAIN;
@ -4163,15 +4197,9 @@ smb2_readv_callback(struct mid_q_entry *mid)
(struct smb2_hdr *)rdata->iov[0].iov_base;
struct cifs_credits credits = { .value = 0, .instance = 0 };
struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
.rq_nvec = 1, };
if (rdata->got_bytes) {
rqst.rq_pages = rdata->pages;
rqst.rq_offset = rdata->page_offset;
rqst.rq_npages = rdata->nr_pages;
rqst.rq_pagesz = rdata->pagesz;
rqst.rq_tailsz = rdata->tailsz;
}
.rq_nvec = 1,
.rq_iter = rdata->iter,
.rq_iter_size = iov_iter_count(&rdata->iter), };
WARN_ONCE(rdata->server != mid->server,
"rdata server %p != mid server %p",
@ -4189,6 +4217,8 @@ smb2_readv_callback(struct mid_q_entry *mid)
if (server->sign && !mid->decrypted) {
int rc;
iov_iter_revert(&rqst.rq_iter, rdata->got_bytes);
iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
rc = smb2_verify_signature(&rqst, server);
if (rc)
cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
@ -4495,10 +4525,27 @@ smb2_async_writev(struct cifs_writedata *wdata,
struct kvec iov[1];
struct smb_rqst rqst = { };
unsigned int total_len;
struct cifs_io_parms _io_parms;
struct cifs_io_parms *io_parms = NULL;
if (!wdata->server)
server = wdata->server = cifs_pick_channel(tcon->ses);
/*
* in future we may get cifs_io_parms passed in from the caller,
* but for now we construct it here...
*/
_io_parms = (struct cifs_io_parms) {
.tcon = tcon,
.server = server,
.offset = wdata->offset,
.length = wdata->bytes,
.persistent_fid = wdata->cfile->fid.persistent_fid,
.volatile_fid = wdata->cfile->fid.volatile_fid,
.pid = wdata->pid,
};
io_parms = &_io_parms;
rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
(void **) &req, &total_len);
if (rc)
@ -4508,49 +4555,44 @@ smb2_async_writev(struct cifs_writedata *wdata,
flags |= CIFS_TRANSFORM_REQ;
shdr = (struct smb2_hdr *)req;
shdr->Id.SyncId.ProcessId = cpu_to_le32(wdata->cfile->pid);
shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = wdata->cfile->fid.persistent_fid;
req->VolatileFileId = wdata->cfile->fid.volatile_fid;
req->PersistentFileId = io_parms->persistent_fid;
req->VolatileFileId = io_parms->volatile_fid;
req->WriteChannelInfoOffset = 0;
req->WriteChannelInfoLength = 0;
req->Channel = 0;
req->Offset = cpu_to_le64(wdata->offset);
req->Channel = SMB2_CHANNEL_NONE;
req->Offset = cpu_to_le64(io_parms->offset);
req->DataOffset = cpu_to_le16(
offsetof(struct smb2_write_req, Buffer));
req->RemainingBytes = 0;
trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
trace_smb3_write_enter(0 /* xid */,
io_parms->persistent_fid,
io_parms->tcon->tid,
io_parms->tcon->ses->Suid,
io_parms->offset,
io_parms->length);
#ifdef CONFIG_CIFS_SMB_DIRECT
/*
* If we want to do a server RDMA read, fill in and append
* smbd_buffer_descriptor_v1 to the end of write request
*/
if (server->rdma && !server->sign && wdata->bytes >=
server->smbd_conn->rdma_readwrite_threshold) {
if (smb3_use_rdma_offload(io_parms)) {
struct smbd_buffer_descriptor_v1 *v1;
size_t data_size = iov_iter_count(&wdata->iter);
bool need_invalidate = server->dialect == SMB30_PROT_ID;
wdata->mr = smbd_register_mr(
server->smbd_conn, wdata->pages,
wdata->nr_pages, wdata->page_offset,
wdata->tailsz, false, need_invalidate);
wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter,
false, need_invalidate);
if (!wdata->mr) {
rc = -EAGAIN;
goto async_writev_out;
}
req->Length = 0;
req->DataOffset = 0;
if (wdata->nr_pages > 1)
req->RemainingBytes =
cpu_to_le32(
(wdata->nr_pages - 1) * wdata->pagesz -
wdata->page_offset + wdata->tailsz
);
else
req->RemainingBytes = cpu_to_le32(wdata->tailsz);
req->RemainingBytes = cpu_to_le32(data_size);
req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
if (need_invalidate)
req->Channel = SMB2_CHANNEL_RDMA_V1;
@ -4569,26 +4611,21 @@ smb2_async_writev(struct cifs_writedata *wdata,
rqst.rq_iov = iov;
rqst.rq_nvec = 1;
rqst.rq_pages = wdata->pages;
rqst.rq_offset = wdata->page_offset;
rqst.rq_npages = wdata->nr_pages;
rqst.rq_pagesz = wdata->pagesz;
rqst.rq_tailsz = wdata->tailsz;
rqst.rq_iter = wdata->iter;
rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
#ifdef CONFIG_CIFS_SMB_DIRECT
if (wdata->mr) {
if (wdata->mr)
iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
rqst.rq_npages = 0;
}
#endif
cifs_dbg(FYI, "async write at %llu %u bytes\n",
wdata->offset, wdata->bytes);
cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
#ifdef CONFIG_CIFS_SMB_DIRECT
/* For RDMA read, I/O size is in RemainingBytes not in Length */
if (!wdata->mr)
req->Length = cpu_to_le32(wdata->bytes);
req->Length = cpu_to_le32(io_parms->length);
#else
req->Length = cpu_to_le32(wdata->bytes);
req->Length = cpu_to_le32(io_parms->length);
#endif
if (wdata->credits.value > 0) {
@ -4596,7 +4633,7 @@ smb2_async_writev(struct cifs_writedata *wdata,
SMB2_MAX_BUFFER_SIZE));
shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
rc = adjust_credits(server, &wdata->credits, io_parms->length);
if (rc)
goto async_writev_out;
@ -4609,9 +4646,12 @@ smb2_async_writev(struct cifs_writedata *wdata,
if (rc) {
trace_smb3_write_err(0 /* no xid */,
req->PersistentFileId,
tcon->tid, tcon->ses->Suid, wdata->offset,
wdata->bytes, rc);
io_parms->persistent_fid,
io_parms->tcon->tid,
io_parms->tcon->ses->Suid,
io_parms->offset,
io_parms->length,
rc);
kref_put(&wdata->refcount, release);
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
}
@ -4906,7 +4946,7 @@ int SMB2_query_directory_init(const unsigned int xid,
memcpy(bufptr, &asteriks, len);
req->FileNameOffset =
cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
cpu_to_le16(sizeof(struct smb2_query_directory_req));
req->FileNameLength = cpu_to_le16(len);
/*
* BB could be 30 bytes or so longer if we used SMB2 specific
@ -4951,10 +4991,10 @@ smb2_parse_query_directory(struct cifs_tcon *tcon,
switch (srch_inf->info_level) {
case SMB_FIND_FILE_DIRECTORY_INFO:
info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
info_buf_size = sizeof(FILE_DIRECTORY_INFO);
break;
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
break;
case SMB_FIND_FILE_POSIX_INFO:
/* note that posix payload are variable size */
@ -5102,8 +5142,7 @@ SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
req->VolatileFileId = volatile_fid;
req->AdditionalInformation = cpu_to_le32(additional_info);
req->BufferOffset =
cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
req->BufferLength = cpu_to_le32(*size);
memcpy(req->Buffer, *data, *size);
@ -5337,9 +5376,9 @@ build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
req->VolatileFileId = volatile_fid;
/* 1 for pad */
req->InputBufferOffset =
cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
cpu_to_le16(sizeof(struct smb2_query_info_req));
req->OutputBufferLength = cpu_to_le32(
outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
outbuf_len + sizeof(struct smb2_query_info_rsp));
iov->iov_base = (char *)req;
iov->iov_len = total_len;

4
fs/cifs/smb2pdu.h
View file

@ -57,7 +57,7 @@ struct smb2_rdma_crypto_transform {
#define COMPOUND_FID 0xFFFFFFFFFFFFFFFFULL
#define SMB2_SYMLINK_STRUCT_SIZE \
(sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
(sizeof(struct smb2_err_rsp) + sizeof(struct smb2_symlink_err_rsp))
#define SYMLINK_ERROR_TAG 0x4c4d5953
@ -371,7 +371,7 @@ struct smb2_file_id_extd_directory_info {
__le32 EaSize; /* EA size */
__le32 ReparsePointTag; /* valid if FILE_ATTR_REPARSE_POINT set in FileAttributes */
__le64 UniqueId; /* inode num - le since Samba puts ino in low 32 bit */
char FileName[1];
char FileName[];
} __packed; /* level 60 */
extern char smb2_padding[7];

539
fs/cifs/smbdirect.c
View file

@ -34,16 +34,21 @@ static int smbd_post_recv(
struct smbd_response *response);
static int smbd_post_send_empty(struct smbd_connection *info);
static int smbd_post_send_data(
struct smbd_connection *info,
struct kvec *iov, int n_vec, int remaining_data_length);
static int smbd_post_send_page(struct smbd_connection *info,
struct page *page, unsigned long offset,
size_t size, int remaining_data_length);
static void destroy_mr_list(struct smbd_connection *info);
static int allocate_mr_list(struct smbd_connection *info);
struct smb_extract_to_rdma {
struct ib_sge *sge;
unsigned int nr_sge;
unsigned int max_sge;
struct ib_device *device;
u32 local_dma_lkey;
enum dma_data_direction direction;
};
static ssize_t smb_extract_iter_to_rdma(struct iov_iter *iter, size_t len,
struct smb_extract_to_rdma *rdma);
/* SMBD version number */
#define SMBD_V1 0x0100
@ -823,16 +828,16 @@ static int smbd_post_send(struct smbd_connection *info,
return rc;
}
static int smbd_post_send_sgl(struct smbd_connection *info,
struct scatterlist *sgl, int data_length, int remaining_data_length)
static int smbd_post_send_iter(struct smbd_connection *info,
struct iov_iter *iter,
int *_remaining_data_length)
{
int num_sgs;
int i, rc;
int header_length;
int data_length;
struct smbd_request *request;
struct smbd_data_transfer *packet;
int new_credits;
struct scatterlist *sg;
wait_credit:
/* Wait for send credits. A SMBD packet needs one credit */
@ -876,6 +881,30 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
}
request->info = info;
memset(request->sge, 0, sizeof(request->sge));
/* Fill in the data payload to find out how much data we can add */
if (iter) {
struct smb_extract_to_rdma extract = {
.nr_sge = 1,
.max_sge = SMBDIRECT_MAX_SEND_SGE,
.sge = request->sge,
.device = info->id->device,
.local_dma_lkey = info->pd->local_dma_lkey,
.direction = DMA_TO_DEVICE,
};
rc = smb_extract_iter_to_rdma(iter, *_remaining_data_length,
&extract);
if (rc < 0)
goto err_dma;
data_length = rc;
request->num_sge = extract.nr_sge;
*_remaining_data_length -= data_length;
} else {
data_length = 0;
request->num_sge = 1;
}
/* Fill in the packet header */
packet = smbd_request_payload(request);
@ -897,7 +926,7 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
else
packet->data_offset = cpu_to_le32(24);
packet->data_length = cpu_to_le32(data_length);
packet->remaining_data_length = cpu_to_le32(remaining_data_length);
packet->remaining_data_length = cpu_to_le32(*_remaining_data_length);
packet->padding = 0;
log_outgoing(INFO, "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n",
@ -913,7 +942,6 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
if (!data_length)
header_length = offsetof(struct smbd_data_transfer, padding);
request->num_sge = 1;
request->sge[0].addr = ib_dma_map_single(info->id->device,
(void *)packet,
header_length,
@ -927,23 +955,6 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
request->sge[0].length = header_length;
request->sge[0].lkey = info->pd->local_dma_lkey;
/* Fill in the packet data payload */
num_sgs = sgl ? sg_nents(sgl) : 0;
for_each_sg(sgl, sg, num_sgs, i) {
request->sge[i+1].addr =
ib_dma_map_page(info->id->device, sg_page(sg),
sg->offset, sg->length, DMA_TO_DEVICE);
if (ib_dma_mapping_error(
info->id->device, request->sge[i+1].addr)) {
rc = -EIO;
request->sge[i+1].addr = 0;
goto err_dma;
}
request->sge[i+1].length = sg->length;
request->sge[i+1].lkey = info->pd->local_dma_lkey;
request->num_sge++;
}
rc = smbd_post_send(info, request);
if (!rc)
return 0;
@ -975,24 +986,6 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
return rc;
}
/*
* Send a page
* page: the page to send
* offset: offset in the page to send
* size: length in the page to send
* remaining_data_length: remaining data to send in this payload
*/
static int smbd_post_send_page(struct smbd_connection *info, struct page *page,
unsigned long offset, size_t size, int remaining_data_length)
{
struct scatterlist sgl;
sg_init_table(&sgl, 1);
sg_set_page(&sgl, page, size, offset);
return smbd_post_send_sgl(info, &sgl, size, remaining_data_length);
}
/*
* Send an empty message
* Empty message is used to extend credits to peer to for keep live
@ -1000,37 +993,10 @@ static int smbd_post_send_page(struct smbd_connection *info, struct page *page,
*/
static int smbd_post_send_empty(struct smbd_connection *info)
{
int remaining_data_length = 0;
info->count_send_empty++;
return smbd_post_send_sgl(info, NULL, 0, 0);
}
/*
* Send a data buffer
* iov: the iov array describing the data buffers
* n_vec: number of iov array
* remaining_data_length: remaining data to send following this packet
* in segmented SMBD packet
*/
static int smbd_post_send_data(
struct smbd_connection *info, struct kvec *iov, int n_vec,
int remaining_data_length)
{
int i;
u32 data_length = 0;
struct scatterlist sgl[SMBDIRECT_MAX_SEND_SGE - 1];
if (n_vec > SMBDIRECT_MAX_SEND_SGE - 1) {
cifs_dbg(VFS, "Can't fit data to SGL, n_vec=%d\n", n_vec);
return -EINVAL;
}
sg_init_table(sgl, n_vec);
for (i = 0; i < n_vec; i++) {
data_length += iov[i].iov_len;
sg_set_buf(&sgl[i], iov[i].iov_base, iov[i].iov_len);
}
return smbd_post_send_sgl(info, sgl, data_length, remaining_data_length);
return smbd_post_send_iter(info, NULL, &remaining_data_length);
}
/*
@ -1700,6 +1666,7 @@ static struct smbd_connection *_smbd_get_connection(
allocate_mr_failed:
/* At this point, need to a full transport shutdown */
server->smbd_conn = info;
smbd_destroy(server);
return NULL;
@ -1985,18 +1952,10 @@ int smbd_send(struct TCP_Server_Info *server,
int num_rqst, struct smb_rqst *rqst_array)
{
struct smbd_connection *info = server->smbd_conn;
struct kvec vecs[SMBDIRECT_MAX_SEND_SGE - 1];
int nvecs;
int size;
unsigned int buflen, remaining_data_length;
unsigned int offset, remaining_vec_data_length;
int start, i, j;
int max_iov_size =
info->max_send_size - sizeof(struct smbd_data_transfer);
struct kvec *iov;
int rc;
struct smb_rqst *rqst;
int rqst_idx;
struct iov_iter iter;
unsigned int remaining_data_length, klen;
int rc, i, rqst_idx;
if (info->transport_status != SMBD_CONNECTED)
return -EAGAIN;
@ -2023,84 +1982,36 @@ int smbd_send(struct TCP_Server_Info *server,
rqst_idx = 0;
do {
rqst = &rqst_array[rqst_idx];
iov = rqst->rq_iov;
cifs_dbg(FYI, "Sending smb (RDMA): idx=%d smb_len=%lu\n",
rqst_idx, smb_rqst_len(server, rqst));
remaining_vec_data_length = 0;
for (i = 0; i < rqst->rq_nvec; i++) {
remaining_vec_data_length += iov[i].iov_len;
dump_smb(iov[i].iov_base, iov[i].iov_len);
rqst_idx, smb_rqst_len(server, rqst));
for (i = 0; i < rqst->rq_nvec; i++)
dump_smb(rqst->rq_iov[i].iov_base, rqst->rq_iov[i].iov_len);
log_write(INFO, "RDMA-WR[%u] nvec=%d len=%u iter=%zu rqlen=%lu\n",
rqst_idx, rqst->rq_nvec, remaining_data_length,
iov_iter_count(&rqst->rq_iter), smb_rqst_len(server, rqst));
/* Send the metadata pages. */
klen = 0;
for (i = 0; i < rqst->rq_nvec; i++)
klen += rqst->rq_iov[i].iov_len;
iov_iter_kvec(&iter, ITER_SOURCE, rqst->rq_iov, rqst->rq_nvec, klen);
rc = smbd_post_send_iter(info, &iter, &remaining_data_length);
if (rc < 0)
break;
if (iov_iter_count(&rqst->rq_iter) > 0) {
/* And then the data pages if there are any */
rc = smbd_post_send_iter(info, &rqst->rq_iter,
&remaining_data_length);
if (rc < 0)
break;
}
log_write(INFO, "rqst_idx=%d nvec=%d rqst->rq_npages=%d rq_pagesz=%d rq_tailsz=%d buflen=%lu\n",
rqst_idx, rqst->rq_nvec,
rqst->rq_npages, rqst->rq_pagesz,
rqst->rq_tailsz, smb_rqst_len(server, rqst));
start = 0;
offset = 0;
do {
buflen = 0;
i = start;
j = 0;
while (i < rqst->rq_nvec &&
j < SMBDIRECT_MAX_SEND_SGE - 1 &&
buflen < max_iov_size) {
vecs[j].iov_base = iov[i].iov_base + offset;
if (buflen + iov[i].iov_len > max_iov_size) {
vecs[j].iov_len =
max_iov_size - iov[i].iov_len;
buflen = max_iov_size;
offset = vecs[j].iov_len;
} else {
vecs[j].iov_len =
iov[i].iov_len - offset;
buflen += vecs[j].iov_len;
offset = 0;
++i;
}
++j;
}
remaining_vec_data_length -= buflen;
remaining_data_length -= buflen;
log_write(INFO, "sending %s iov[%d] from start=%d nvecs=%d remaining_data_length=%d\n",
remaining_vec_data_length > 0 ?
"partial" : "complete",
rqst->rq_nvec, start, j,
remaining_data_length);
start = i;
rc = smbd_post_send_data(info, vecs, j, remaining_data_length);
if (rc)
goto done;
} while (remaining_vec_data_length > 0);
/* now sending pages if there are any */
for (i = 0; i < rqst->rq_npages; i++) {
rqst_page_get_length(rqst, i, &buflen, &offset);
nvecs = (buflen + max_iov_size - 1) / max_iov_size;
log_write(INFO, "sending pages buflen=%d nvecs=%d\n",
buflen, nvecs);
for (j = 0; j < nvecs; j++) {
size = min_t(unsigned int, max_iov_size, remaining_data_length);
remaining_data_length -= size;
log_write(INFO, "sending pages i=%d offset=%d size=%d remaining_data_length=%d\n",
i, j * max_iov_size + offset, size,
remaining_data_length);
rc = smbd_post_send_page(
info, rqst->rq_pages[i],
j*max_iov_size + offset,
size, remaining_data_length);
if (rc)
goto done;
}
}
} while (++rqst_idx < num_rqst);
done:
/*
* As an optimization, we don't wait for individual I/O to finish
* before sending the next one.
@ -2191,10 +2102,10 @@ static void destroy_mr_list(struct smbd_connection *info)
cancel_work_sync(&info->mr_recovery_work);
list_for_each_entry_safe(mr, tmp, &info->mr_list, list) {
if (mr->state == MR_INVALIDATED)
ib_dma_unmap_sg(info->id->device, mr->sgl,
mr->sgl_count, mr->dir);
ib_dma_unmap_sg(info->id->device, mr->sgt.sgl,
mr->sgt.nents, mr->dir);
ib_dereg_mr(mr->mr);
kfree(mr->sgl);
kfree(mr->sgt.sgl);
kfree(mr);
}
}
@ -2217,6 +2128,7 @@ static int allocate_mr_list(struct smbd_connection *info)
atomic_set(&info->mr_ready_count, 0);
atomic_set(&info->mr_used_count, 0);
init_waitqueue_head(&info->wait_for_mr_cleanup);
INIT_WORK(&info->mr_recovery_work, smbd_mr_recovery_work);
/* Allocate more MRs (2x) than hardware responder_resources */
for (i = 0; i < info->responder_resources * 2; i++) {
smbdirect_mr = kzalloc(sizeof(*smbdirect_mr), GFP_KERNEL);
@ -2229,11 +2141,10 @@ static int allocate_mr_list(struct smbd_connection *info)
info->mr_type, info->max_frmr_depth);
goto out;
}
smbdirect_mr->sgl = kcalloc(
info->max_frmr_depth,
sizeof(struct scatterlist),
GFP_KERNEL);
if (!smbdirect_mr->sgl) {
smbdirect_mr->sgt.sgl = kcalloc(info->max_frmr_depth,
sizeof(struct scatterlist),
GFP_KERNEL);
if (!smbdirect_mr->sgt.sgl) {
log_rdma_mr(ERR, "failed to allocate sgl\n");
ib_dereg_mr(smbdirect_mr->mr);
goto out;
@ -2244,15 +2155,15 @@ static int allocate_mr_list(struct smbd_connection *info)
list_add_tail(&smbdirect_mr->list, &info->mr_list);
atomic_inc(&info->mr_ready_count);
}
INIT_WORK(&info->mr_recovery_work, smbd_mr_recovery_work);
return 0;
out:
kfree(smbdirect_mr);
list_for_each_entry_safe(smbdirect_mr, tmp, &info->mr_list, list) {
list_del(&smbdirect_mr->list);
ib_dereg_mr(smbdirect_mr->mr);
kfree(smbdirect_mr->sgl);
kfree(smbdirect_mr->sgt.sgl);
kfree(smbdirect_mr);
}
return -ENOMEM;
@ -2304,27 +2215,46 @@ static struct smbd_mr *get_mr(struct smbd_connection *info)
goto again;
}
/*
* Transcribe the pages from an iterator into an MR scatterlist.
*/
static int smbd_iter_to_mr(struct smbd_connection *info,
struct iov_iter *iter,
struct sg_table *sgt,
unsigned int max_sg)
{
int ret;
memset(sgt->sgl, 0, max_sg * sizeof(struct scatterlist));
ret = netfs_extract_iter_to_sg(iter, iov_iter_count(iter), sgt, max_sg, 0);
WARN_ON(ret < 0);
if (sgt->nents > 0)
sg_mark_end(&sgt->sgl[sgt->nents - 1]);
return ret;
}
/*
* Register memory for RDMA read/write
* pages[]: the list of pages to register memory with
* num_pages: the number of pages to register
* tailsz: if non-zero, the bytes to register in the last page
* iter: the buffer to register memory with
* writing: true if this is a RDMA write (SMB read), false for RDMA read
* need_invalidate: true if this MR needs to be locally invalidated after I/O
* return value: the MR registered, NULL if failed.
*/
struct smbd_mr *smbd_register_mr(
struct smbd_connection *info, struct page *pages[], int num_pages,
int offset, int tailsz, bool writing, bool need_invalidate)
struct smbd_mr *smbd_register_mr(struct smbd_connection *info,
struct iov_iter *iter,
bool writing, bool need_invalidate)
{
struct smbd_mr *smbdirect_mr;
int rc, i;
int rc, num_pages;
enum dma_data_direction dir;
struct ib_reg_wr *reg_wr;
num_pages = iov_iter_npages(iter, info->max_frmr_depth + 1);
if (num_pages > info->max_frmr_depth) {
log_rdma_mr(ERR, "num_pages=%d max_frmr_depth=%d\n",
num_pages, info->max_frmr_depth);
WARN_ON_ONCE(1);
return NULL;
}
@ -2333,45 +2263,31 @@ struct smbd_mr *smbd_register_mr(
log_rdma_mr(ERR, "get_mr returning NULL\n");
return NULL;
}
smbdirect_mr->need_invalidate = need_invalidate;
smbdirect_mr->sgl_count = num_pages;
sg_init_table(smbdirect_mr->sgl, num_pages);
log_rdma_mr(INFO, "num_pages=0x%x offset=0x%x tailsz=0x%x\n",
num_pages, offset, tailsz);
if (num_pages == 1) {
sg_set_page(&smbdirect_mr->sgl[0], pages[0], tailsz, offset);
goto skip_multiple_pages;
}
/* We have at least two pages to register */
sg_set_page(
&smbdirect_mr->sgl[0], pages[0], PAGE_SIZE - offset, offset);
i = 1;
while (i < num_pages - 1) {
sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0);
i++;
}
sg_set_page(&smbdirect_mr->sgl[i], pages[i],
tailsz ? tailsz : PAGE_SIZE, 0);
skip_multiple_pages:
dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
smbdirect_mr->dir = dir;
rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgl, num_pages, dir);
smbdirect_mr->need_invalidate = need_invalidate;
smbdirect_mr->sgt.nents = 0;
smbdirect_mr->sgt.orig_nents = 0;
log_rdma_mr(INFO, "num_pages=0x%x count=0x%zx depth=%u\n",
num_pages, iov_iter_count(iter), info->max_frmr_depth);
smbd_iter_to_mr(info, iter, &smbdirect_mr->sgt, info->max_frmr_depth);
rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgt.sgl,
smbdirect_mr->sgt.nents, dir);
if (!rc) {
log_rdma_mr(ERR, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n",
num_pages, dir, rc);
goto dma_map_error;
}
rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgl, num_pages,
NULL, PAGE_SIZE);
if (rc != num_pages) {
rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgt.sgl,
smbdirect_mr->sgt.nents, NULL, PAGE_SIZE);
if (rc != smbdirect_mr->sgt.nents) {
log_rdma_mr(ERR,
"ib_map_mr_sg failed rc = %d num_pages = %x\n",
rc, num_pages);
"ib_map_mr_sg failed rc = %d nents = %x\n",
rc, smbdirect_mr->sgt.nents);
goto map_mr_error;
}
@ -2403,8 +2319,8 @@ struct smbd_mr *smbd_register_mr(
/* If all failed, attempt to recover this MR by setting it MR_ERROR*/
map_mr_error:
ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgl,
smbdirect_mr->sgl_count, smbdirect_mr->dir);
ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgt.sgl,
smbdirect_mr->sgt.nents, smbdirect_mr->dir);
dma_map_error:
smbdirect_mr->state = MR_ERROR;
@ -2471,8 +2387,8 @@ int smbd_deregister_mr(struct smbd_mr *smbdirect_mr)
if (smbdirect_mr->state == MR_INVALIDATED) {
ib_dma_unmap_sg(
info->id->device, smbdirect_mr->sgl,
smbdirect_mr->sgl_count,
info->id->device, smbdirect_mr->sgt.sgl,
smbdirect_mr->sgt.nents,
smbdirect_mr->dir);
smbdirect_mr->state = MR_READY;
if (atomic_inc_return(&info->mr_ready_count) == 1)
@ -2490,3 +2406,206 @@ int smbd_deregister_mr(struct smbd_mr *smbdirect_mr)
return rc;
}
static bool smb_set_sge(struct smb_extract_to_rdma *rdma,
struct page *lowest_page, size_t off, size_t len)
{
struct ib_sge *sge = &rdma->sge[rdma->nr_sge];
u64 addr;
addr = ib_dma_map_page(rdma->device, lowest_page,
off, len, rdma->direction);
if (ib_dma_mapping_error(rdma->device, addr))
return false;
sge->addr = addr;
sge->length = len;
sge->lkey = rdma->local_dma_lkey;
rdma->nr_sge++;
return true;
}
/*
* Extract page fragments from a BVEC-class iterator and add them to an RDMA
* element list. The pages are not pinned.
*/
static ssize_t smb_extract_bvec_to_rdma(struct iov_iter *iter,
struct smb_extract_to_rdma *rdma,
ssize_t maxsize)
{
const struct bio_vec *bv = iter->bvec;
unsigned long start = iter->iov_offset;
unsigned int i;
ssize_t ret = 0;
for (i = 0; i < iter->nr_segs; i++) {
size_t off, len;
len = bv[i].bv_len;
if (start >= len) {
start -= len;
continue;
}
len = min_t(size_t, maxsize, len - start);
off = bv[i].bv_offset + start;
if (!smb_set_sge(rdma, bv[i].bv_page, off, len))
return -EIO;
ret += len;
maxsize -= len;
if (rdma->nr_sge >= rdma->max_sge || maxsize <= 0)
break;
start = 0;
}
return ret;
}
/*
* Extract fragments from a KVEC-class iterator and add them to an RDMA list.
* This can deal with vmalloc'd buffers as well as kmalloc'd or static buffers.
* The pages are not pinned.
*/
static ssize_t smb_extract_kvec_to_rdma(struct iov_iter *iter,
struct smb_extract_to_rdma *rdma,
ssize_t maxsize)
{
const struct kvec *kv = iter->kvec;
unsigned long start = iter->iov_offset;
unsigned int i;
ssize_t ret = 0;
for (i = 0; i < iter->nr_segs; i++) {
struct page *page;
unsigned long kaddr;
size_t off, len, seg;
len = kv[i].iov_len;
if (start >= len) {
start -= len;
continue;
}
kaddr = (unsigned long)kv[i].iov_base + start;
off = kaddr & ~PAGE_MASK;
len = min_t(size_t, maxsize, len - start);
kaddr &= PAGE_MASK;
maxsize -= len;
do {
seg = min_t(size_t, len, PAGE_SIZE - off);
if (is_vmalloc_or_module_addr((void *)kaddr))
page = vmalloc_to_page((void *)kaddr);
else
page = virt_to_page(kaddr);
if (!smb_set_sge(rdma, page, off, seg))
return -EIO;
ret += seg;
len -= seg;
kaddr += PAGE_SIZE;
off = 0;
} while (len > 0 && rdma->nr_sge < rdma->max_sge);
if (rdma->nr_sge >= rdma->max_sge || maxsize <= 0)
break;
start = 0;
}
return ret;
}
/*
* Extract folio fragments from an XARRAY-class iterator and add them to an
* RDMA list. The folios are not pinned.
*/
static ssize_t smb_extract_xarray_to_rdma(struct iov_iter *iter,
struct smb_extract_to_rdma *rdma,
ssize_t maxsize)
{
struct xarray *xa = iter->xarray;
struct folio *folio;
loff_t start = iter->xarray_start + iter->iov_offset;
pgoff_t index = start / PAGE_SIZE;
ssize_t ret = 0;
size_t off, len;
XA_STATE(xas, xa, index);
rcu_read_lock();
xas_for_each(&xas, folio, ULONG_MAX) {
if (xas_retry(&xas, folio))
continue;
if (WARN_ON(xa_is_value(folio)))
break;
if (WARN_ON(folio_test_hugetlb(folio)))
break;
off = offset_in_folio(folio, start);
len = min_t(size_t, maxsize, folio_size(folio) - off);
if (!smb_set_sge(rdma, folio_page(folio, 0), off, len)) {
rcu_read_unlock();
return -EIO;
}
maxsize -= len;
ret += len;
if (rdma->nr_sge >= rdma->max_sge || maxsize <= 0)
break;
}
rcu_read_unlock();
return ret;
}
/*
* Extract page fragments from up to the given amount of the source iterator
* and build up an RDMA list that refers to all of those bits. The RDMA list
* is appended to, up to the maximum number of elements set in the parameter
* block.
*
* The extracted page fragments are not pinned or ref'd in any way; if an
* IOVEC/UBUF-type iterator is to be used, it should be converted to a
* BVEC-type iterator and the pages pinned, ref'd or otherwise held in some
* way.
*/
static ssize_t smb_extract_iter_to_rdma(struct iov_iter *iter, size_t len,
struct smb_extract_to_rdma *rdma)
{
ssize_t ret;
int before = rdma->nr_sge;
switch (iov_iter_type(iter)) {
case ITER_BVEC:
ret = smb_extract_bvec_to_rdma(iter, rdma, len);
break;
case ITER_KVEC:
ret = smb_extract_kvec_to_rdma(iter, rdma, len);
break;
case ITER_XARRAY:
ret = smb_extract_xarray_to_rdma(iter, rdma, len);
break;
default:
WARN_ON_ONCE(1);
return -EIO;
}
if (ret > 0) {
iov_iter_advance(iter, ret);
} else if (ret < 0) {
while (rdma->nr_sge > before) {
struct ib_sge *sge = &rdma->sge[rdma->nr_sge--];
ib_dma_unmap_single(rdma->device, sge->addr, sge->length,
rdma->direction);
sge->addr = 0;
}
}
return ret;
}

7
fs/cifs/smbdirect.h
View file

@ -288,8 +288,7 @@ struct smbd_mr {
struct list_head list;
enum mr_state state;
struct ib_mr *mr;
struct scatterlist *sgl;
int sgl_count;
struct sg_table sgt;
enum dma_data_direction dir;
union {
struct ib_reg_wr wr;
@ -302,8 +301,8 @@ struct smbd_mr {
/* Interfaces to register and deregister MR for RDMA read/write */
struct smbd_mr *smbd_register_mr(
struct smbd_connection *info, struct page *pages[], int num_pages,
int offset, int tailsz, bool writing, bool need_invalidate);
struct smbd_connection *info, struct iov_iter *iter,
bool writing, bool need_invalidate);
int smbd_deregister_mr(struct smbd_mr *mr);
#else

87
fs/cifs/transport.c
View file

@ -270,26 +270,7 @@ smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst)
for (i = 0; i < nvec; i++)
buflen += iov[i].iov_len;
/*
* Add in the page array if there is one. The caller needs to make
* sure rq_offset and rq_tailsz are set correctly. If a buffer of
* multiple pages ends at page boundary, rq_tailsz needs to be set to
* PAGE_SIZE.
*/
if (rqst->rq_npages) {
if (rqst->rq_npages == 1)
buflen += rqst->rq_tailsz;
else {
/*
* If there is more than one page, calculate the
* buffer length based on rq_offset and rq_tailsz
*/
buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) -
rqst->rq_offset;
buflen += rqst->rq_tailsz;
}
}
buflen += iov_iter_count(&rqst->rq_iter);
return buflen;
}
@ -376,23 +357,15 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
total_len += sent;
/* now walk the page array and send each page in it */
for (i = 0; i < rqst[j].rq_npages; i++) {
struct bio_vec bvec;
bvec.bv_page = rqst[j].rq_pages[i];
rqst_page_get_length(&rqst[j], i, &bvec.bv_len,
&bvec.bv_offset);
iov_iter_bvec(&smb_msg.msg_iter, ITER_SOURCE,
&bvec, 1, bvec.bv_len);
if (iov_iter_count(&rqst[j].rq_iter) > 0) {
smb_msg.msg_iter = rqst[j].rq_iter;
rc = smb_send_kvec(server, &smb_msg, &sent);
if (rc < 0)
break;
total_len += sent;
}
}
}
unmask:
sigprocmask(SIG_SETMASK, &oldmask, NULL);
@ -1034,15 +1007,40 @@ cifs_cancelled_callback(struct mid_q_entry *mid)
struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses)
{
uint index = 0;
unsigned int min_in_flight = UINT_MAX, max_in_flight = 0;
struct TCP_Server_Info *server = NULL;
int i;
if (!ses)
return NULL;
/* round robin */
index = (uint)atomic_inc_return(&ses->chan_seq);
spin_lock(&ses->chan_lock);
index %= ses->chan_count;
for (i = 0; i < ses->chan_count; i++) {
server = ses->chans[i].server;
if (!server)
continue;
/*
* strictly speaking, we should pick up req_lock to read
* server->in_flight. But it shouldn't matter much here if we
* race while reading this data. The worst that can happen is
* that we could use a channel that's not least loaded. Avoiding
* taking the lock could help reduce wait time, which is
* important for this function
*/
if (server->in_flight < min_in_flight) {
min_in_flight = server->in_flight;
index = i;
}
if (server->in_flight > max_in_flight)
max_in_flight = server->in_flight;
}
/* if all channels are equally loaded, fall back to round-robin */
if (min_in_flight == max_in_flight) {
index = (uint)atomic_inc_return(&ses->chan_seq);
index %= ses->chan_count;
}
spin_unlock(&ses->chan_lock);
return ses->chans[index].server;
@ -1640,11 +1638,11 @@ int
cifs_discard_remaining_data(struct TCP_Server_Info *server)
{
unsigned int rfclen = server->pdu_size;
int remaining = rfclen + HEADER_PREAMBLE_SIZE(server) -
size_t remaining = rfclen + HEADER_PREAMBLE_SIZE(server) -
server->total_read;
while (remaining > 0) {
int length;
ssize_t length;
length = cifs_discard_from_socket(server,
min_t(size_t, remaining,
@ -1790,10 +1788,15 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
return cifs_readv_discard(server, mid);
}
length = rdata->read_into_pages(server, rdata, data_len);
if (length < 0)
return length;
#ifdef CONFIG_CIFS_SMB_DIRECT
if (rdata->mr)
length = data_len; /* An RDMA read is already done. */
else
#endif
length = cifs_read_iter_from_socket(server, &rdata->iter,
data_len);
if (length > 0)
rdata->got_bytes += length;
server->total_read += length;
cifs_dbg(FYI, "total_read=%u buflen=%u remaining=%u\n",

8
fs/ksmbd/smb2ops.c
View file

@ -26,7 +26,7 @@ static struct smb_version_values smb21_server_values = {
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
.header_size = sizeof(struct smb2_hdr),
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -52,7 +52,7 @@ static struct smb_version_values smb30_server_values = {
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
.header_size = sizeof(struct smb2_hdr),
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -79,7 +79,7 @@ static struct smb_version_values smb302_server_values = {
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
.header_size = sizeof(struct smb2_hdr),
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
@ -106,7 +106,7 @@ static struct smb_version_values smb311_server_values = {
.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
.header_size = sizeof(struct smb2_hdr),
.max_header_size = MAX_SMB2_HDR_SIZE,
.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
.read_rsp_size = sizeof(struct smb2_read_rsp),
.lock_cmd = SMB2_LOCK,
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,

6
fs/ksmbd/smb2pdu.c
View file

@ -274,8 +274,7 @@ int init_smb2_neg_rsp(struct ksmbd_work *work)
le16_to_cpu(rsp->SecurityBufferOffset));
inc_rfc1001_len(work->response_buf,
sizeof(struct smb2_negotiate_rsp) -
sizeof(struct smb2_hdr) - sizeof(rsp->Buffer) +
AUTH_GSS_LENGTH);
sizeof(struct smb2_hdr) + AUTH_GSS_LENGTH);
rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY)
rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
@ -1205,8 +1204,7 @@ int smb2_handle_negotiate(struct ksmbd_work *work)
ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
le16_to_cpu(rsp->SecurityBufferOffset));
inc_rfc1001_len(work->response_buf, sizeof(struct smb2_negotiate_rsp) -
sizeof(struct smb2_hdr) - sizeof(rsp->Buffer) +
AUTH_GSS_LENGTH);
sizeof(struct smb2_hdr) + AUTH_GSS_LENGTH);
rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
conn->use_spnego = true;

1
fs/netfs/Makefile
View file

@ -3,6 +3,7 @@
netfs-y := \
buffered_read.o \
io.o \
iterator.o \
main.o \
objects.o

369
fs/netfs/iterator.c Normal file
View file

@ -0,0 +1,369 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/* Iterator helpers.
*
* Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/scatterlist.h>
#include <linux/netfs.h>
#include "internal.h"
/**
* netfs_extract_user_iter - Extract the pages from a user iterator into a bvec
* @orig: The original iterator
* @orig_len: The amount of iterator to copy
* @new: The iterator to be set up
* @extraction_flags: Flags to qualify the request
*
* Extract the page fragments from the given amount of the source iterator and
* build up a second iterator that refers to all of those bits. This allows
* the original iterator to disposed of.
*
* @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA be
* allowed on the pages extracted.
*
* On success, the number of elements in the bvec is returned, the original
* iterator will have been advanced by the amount extracted.
*
* The iov_iter_extract_mode() function should be used to query how cleanup
* should be performed.
*/
ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,
struct iov_iter *new,
iov_iter_extraction_t extraction_flags)
{
struct bio_vec *bv = NULL;
struct page **pages;
unsigned int cur_npages;
unsigned int max_pages;
unsigned int npages = 0;
unsigned int i;
ssize_t ret;
size_t count = orig_len, offset, len;
size_t bv_size, pg_size;
if (WARN_ON_ONCE(!iter_is_ubuf(orig) && !iter_is_iovec(orig)))
return -EIO;
max_pages = iov_iter_npages(orig, INT_MAX);
bv_size = array_size(max_pages, sizeof(*bv));
bv = kvmalloc(bv_size, GFP_KERNEL);
if (!bv)
return -ENOMEM;
/* Put the page list at the end of the bvec list storage. bvec
* elements are larger than page pointers, so as long as we work
* 0->last, we should be fine.
*/
pg_size = array_size(max_pages, sizeof(*pages));
pages = (void *)bv + bv_size - pg_size;
while (count && npages < max_pages) {
ret = iov_iter_extract_pages(orig, &pages, count,
max_pages - npages, extraction_flags,
&offset);
if (ret < 0) {
pr_err("Couldn't get user pages (rc=%zd)\n", ret);
break;
}
if (ret > count) {
pr_err("get_pages rc=%zd more than %zu\n", ret, count);
break;
}
count -= ret;
ret += offset;
cur_npages = DIV_ROUND_UP(ret, PAGE_SIZE);
if (npages + cur_npages > max_pages) {
pr_err("Out of bvec array capacity (%u vs %u)\n",
npages + cur_npages, max_pages);
break;
}
for (i = 0; i < cur_npages; i++) {
len = ret > PAGE_SIZE ? PAGE_SIZE : ret;
bvec_set_page(bv + npages + i, *pages++, len - offset, offset);
ret -= len;
offset = 0;
}
npages += cur_npages;
}
iov_iter_bvec(new, orig->data_source, bv, npages, orig_len - count);
return npages;
}
EXPORT_SYMBOL_GPL(netfs_extract_user_iter);
/*
* Extract and pin a list of up to sg_max pages from UBUF- or IOVEC-class
* iterators, and add them to the scatterlist.
*/
static ssize_t netfs_extract_user_to_sg(struct iov_iter *iter,
ssize_t maxsize,
struct sg_table *sgtable,
unsigned int sg_max,
iov_iter_extraction_t extraction_flags)
{
struct scatterlist *sg = sgtable->sgl + sgtable->nents;
struct page **pages;
unsigned int npages;
ssize_t ret = 0, res;
size_t len, off;
/* We decant the page list into the tail of the scatterlist */
pages = (void *)sgtable->sgl + array_size(sg_max, sizeof(struct scatterlist));
pages -= sg_max;
do {
res = iov_iter_extract_pages(iter, &pages, maxsize, sg_max,
extraction_flags, &off);
if (res < 0)
goto failed;
len = res;
maxsize -= len;
ret += len;
npages = DIV_ROUND_UP(off + len, PAGE_SIZE);
sg_max -= npages;
for (; npages < 0; npages--) {
struct page *page = *pages;
size_t seg = min_t(size_t, PAGE_SIZE - off, len);
*pages++ = NULL;
sg_set_page(sg, page, len, off);
sgtable->nents++;
sg++;
len -= seg;
off = 0;
}
} while (maxsize > 0 && sg_max > 0);
return ret;
failed:
while (sgtable->nents > sgtable->orig_nents)
put_page(sg_page(&sgtable->sgl[--sgtable->nents]));
return res;
}
/*
* Extract up to sg_max pages from a BVEC-type iterator and add them to the
* scatterlist. The pages are not pinned.
*/
static ssize_t netfs_extract_bvec_to_sg(struct iov_iter *iter,
ssize_t maxsize,
struct sg_table *sgtable,
unsigned int sg_max,
iov_iter_extraction_t extraction_flags)
{
const struct bio_vec *bv = iter->bvec;
struct scatterlist *sg = sgtable->sgl + sgtable->nents;
unsigned long start = iter->iov_offset;
unsigned int i;
ssize_t ret = 0;
for (i = 0; i < iter->nr_segs; i++) {
size_t off, len;
len = bv[i].bv_len;
if (start >= len) {
start -= len;
continue;
}
len = min_t(size_t, maxsize, len - start);
off = bv[i].bv_offset + start;
sg_set_page(sg, bv[i].bv_page, len, off);
sgtable->nents++;
sg++;
sg_max--;
ret += len;
maxsize -= len;
if (maxsize <= 0 || sg_max == 0)
break;
start = 0;
}
if (ret > 0)
iov_iter_advance(iter, ret);
return ret;
}
/*
* Extract up to sg_max pages from a KVEC-type iterator and add them to the
* scatterlist. This can deal with vmalloc'd buffers as well as kmalloc'd or
* static buffers. The pages are not pinned.
*/
static ssize_t netfs_extract_kvec_to_sg(struct iov_iter *iter,
ssize_t maxsize,
struct sg_table *sgtable,
unsigned int sg_max,
iov_iter_extraction_t extraction_flags)
{
const struct kvec *kv = iter->kvec;
struct scatterlist *sg = sgtable->sgl + sgtable->nents;
unsigned long start = iter->iov_offset;
unsigned int i;
ssize_t ret = 0;
for (i = 0; i < iter->nr_segs; i++) {
struct page *page;
unsigned long kaddr;
size_t off, len, seg;
len = kv[i].iov_len;
if (start >= len) {
start -= len;
continue;
}
kaddr = (unsigned long)kv[i].iov_base + start;
off = kaddr & ~PAGE_MASK;
len = min_t(size_t, maxsize, len - start);
kaddr &= PAGE_MASK;
maxsize -= len;
ret += len;
do {
seg = min_t(size_t, len, PAGE_SIZE - off);
if (is_vmalloc_or_module_addr((void *)kaddr))
page = vmalloc_to_page((void *)kaddr);
else
page = virt_to_page(kaddr);
sg_set_page(sg, page, len, off);
sgtable->nents++;
sg++;
sg_max--;
len -= seg;
kaddr += PAGE_SIZE;
off = 0;
} while (len > 0 && sg_max > 0);
if (maxsize <= 0 || sg_max == 0)
break;
start = 0;
}
if (ret > 0)
iov_iter_advance(iter, ret);
return ret;
}
/*
* Extract up to sg_max folios from an XARRAY-type iterator and add them to
* the scatterlist. The pages are not pinned.
*/
static ssize_t netfs_extract_xarray_to_sg(struct iov_iter *iter,
ssize_t maxsize,
struct sg_table *sgtable,
unsigned int sg_max,
iov_iter_extraction_t extraction_flags)
{
struct scatterlist *sg = sgtable->sgl + sgtable->nents;
struct xarray *xa = iter->xarray;
struct folio *folio;
loff_t start = iter->xarray_start + iter->iov_offset;
pgoff_t index = start / PAGE_SIZE;
ssize_t ret = 0;
size_t offset, len;
XA_STATE(xas, xa, index);
rcu_read_lock();
xas_for_each(&xas, folio, ULONG_MAX) {
if (xas_retry(&xas, folio))
continue;
if (WARN_ON(xa_is_value(folio)))
break;
if (WARN_ON(folio_test_hugetlb(folio)))
break;
offset = offset_in_folio(folio, start);
len = min_t(size_t, maxsize, folio_size(folio) - offset);
sg_set_page(sg, folio_page(folio, 0), len, offset);
sgtable->nents++;
sg++;
sg_max--;
maxsize -= len;
ret += len;
if (maxsize <= 0 || sg_max == 0)
break;
}
rcu_read_unlock();
if (ret > 0)
iov_iter_advance(iter, ret);
return ret;
}
/**
* netfs_extract_iter_to_sg - Extract pages from an iterator and add ot an sglist
* @iter: The iterator to extract from
* @maxsize: The amount of iterator to copy
* @sgtable: The scatterlist table to fill in
* @sg_max: Maximum number of elements in @sgtable that may be filled
* @extraction_flags: Flags to qualify the request
*
* Extract the page fragments from the given amount of the source iterator and
* add them to a scatterlist that refers to all of those bits, to a maximum
* addition of @sg_max elements.
*
* The pages referred to by UBUF- and IOVEC-type iterators are extracted and
* pinned; BVEC-, KVEC- and XARRAY-type are extracted but aren't pinned; PIPE-
* and DISCARD-type are not supported.
*
* No end mark is placed on the scatterlist; that's left to the caller.
*
* @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA
* be allowed on the pages extracted.
*
* If successul, @sgtable->nents is updated to include the number of elements
* added and the number of bytes added is returned. @sgtable->orig_nents is
* left unaltered.
*
* The iov_iter_extract_mode() function should be used to query how cleanup
* should be performed.
*/
ssize_t netfs_extract_iter_to_sg(struct iov_iter *iter, size_t maxsize,
struct sg_table *sgtable, unsigned int sg_max,
iov_iter_extraction_t extraction_flags)
{
if (maxsize == 0)
return 0;
switch (iov_iter_type(iter)) {
case ITER_UBUF:
case ITER_IOVEC:
return netfs_extract_user_to_sg(iter, maxsize, sgtable, sg_max,
extraction_flags);
case ITER_BVEC:
return netfs_extract_bvec_to_sg(iter, maxsize, sgtable, sg_max,
extraction_flags);
case ITER_KVEC:
return netfs_extract_kvec_to_sg(iter, maxsize, sgtable, sg_max,
extraction_flags);
case ITER_XARRAY:
return netfs_extract_xarray_to_sg(iter, maxsize, sgtable, sg_max,
extraction_flags);
default:
pr_err("%s(%u) unsupported\n", __func__, iov_iter_type(iter));
WARN_ON_ONCE(1);
return -EIO;
}
}
EXPORT_SYMBOL_GPL(netfs_extract_iter_to_sg);

42
fs/smbfs_common/smb2pdu.h
View file

@ -167,7 +167,7 @@ struct smb2_err_rsp {
__u8 ErrorContextCount;
__u8 Reserved;
__le32 ByteCount; /* even if zero, at least one byte follows */
__u8 ErrorData[1]; /* variable length */
__u8 ErrorData[]; /* variable length */
} __packed;
#define SMB3_AES_CCM_NONCE 11
@ -308,7 +308,7 @@ struct smb2_tree_connect_req {
__le16 Flags; /* Flags in SMB3.1.1 */
__le16 PathOffset;
__le16 PathLength;
__u8 Buffer[1]; /* variable length */
__u8 Buffer[]; /* variable length */
} __packed;
/* Possible ShareType values */
@ -595,7 +595,7 @@ struct smb2_negotiate_rsp {
__le16 SecurityBufferOffset;
__le16 SecurityBufferLength;
__le32 NegotiateContextOffset; /* Pre:SMB3.1.1 was reserved/ignored */
__u8 Buffer[1]; /* variable length GSS security buffer */
__u8 Buffer[]; /* variable length GSS security buffer */
} __packed;
@ -616,7 +616,7 @@ struct smb2_sess_setup_req {
__le16 SecurityBufferOffset;
__le16 SecurityBufferLength;
__le64 PreviousSessionId;
__u8 Buffer[1]; /* variable length GSS security buffer */
__u8 Buffer[]; /* variable length GSS security buffer */
} __packed;
/* Currently defined SessionFlags */
@ -633,7 +633,7 @@ struct smb2_sess_setup_rsp {
__le16 SessionFlags;
__le16 SecurityBufferOffset;
__le16 SecurityBufferLength;
__u8 Buffer[1]; /* variable length GSS security buffer */
__u8 Buffer[]; /* variable length GSS security buffer */
} __packed;
@ -715,7 +715,7 @@ struct smb2_read_req {
__le32 RemainingBytes;
__le16 ReadChannelInfoOffset;
__le16 ReadChannelInfoLength;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
/* Read flags */
@ -730,7 +730,7 @@ struct smb2_read_rsp {
__le32 DataLength;
__le32 DataRemaining;
__le32 Flags;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
@ -754,7 +754,7 @@ struct smb2_write_req {
__le16 WriteChannelInfoOffset;
__le16 WriteChannelInfoLength;
__le32 Flags;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
struct smb2_write_rsp {
@ -765,7 +765,7 @@ struct smb2_write_rsp {
__le32 DataLength;
__le32 DataRemaining;
__u32 Reserved2;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
@ -812,7 +812,10 @@ struct smb2_lock_req {
__u64 PersistentFileId;
__u64 VolatileFileId;
/* Followed by at least one */
struct smb2_lock_element locks[1];
union {
struct smb2_lock_element lock;
DECLARE_FLEX_ARRAY(struct smb2_lock_element, locks);
};
} __packed;
struct smb2_lock_rsp {
@ -866,7 +869,7 @@ struct smb2_query_directory_req {
__le16 FileNameOffset;
__le16 FileNameLength;
__le32 OutputBufferLength;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
struct smb2_query_directory_rsp {
@ -874,7 +877,7 @@ struct smb2_query_directory_rsp {
__le16 StructureSize; /* Must be 9 */
__le16 OutputBufferOffset;
__le32 OutputBufferLength;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
/*
@ -897,7 +900,7 @@ struct smb2_set_info_req {
__le32 AdditionalInformation;
__u64 PersistentFileId;
__u64 VolatileFileId;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
struct smb2_set_info_rsp {
@ -952,7 +955,7 @@ struct smb2_change_notify_rsp {
__le16 StructureSize; /* Must be 9 */
__le16 OutputBufferOffset;
__le32 OutputBufferLength;
__u8 Buffer[1]; /* array of file notify structs */
__u8 Buffer[]; /* array of file notify structs */
} __packed;
@ -1158,7 +1161,7 @@ struct smb2_create_rsp {
__u64 VolatileFileId;
__le32 CreateContextsOffset;
__le32 CreateContextsLength;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
struct create_posix {
@ -1501,7 +1504,7 @@ struct smb2_query_info_req {
__le32 Flags;
__u64 PersistentFileId;
__u64 VolatileFileId;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
struct smb2_query_info_rsp {
@ -1509,7 +1512,7 @@ struct smb2_query_info_rsp {
__le16 StructureSize; /* Must be 9 */
__le16 OutputBufferOffset;
__le32 OutputBufferLength;
__u8 Buffer[1];
__u8 Buffer[];
} __packed;
/*
@ -1570,7 +1573,10 @@ struct smb2_file_all_info { /* data block encoding of response to level 18 */
__le32 Mode;
__le32 AlignmentRequirement;
__le32 FileNameLength;
char FileName[1];
union {
char __pad; /* Legacy structure padding */
DECLARE_FLEX_ARRAY(char, FileName);
};
} __packed; /* level 18 Query */
struct smb2_file_eof_info { /* encoding of request for level 10 */

93
fs/splice.c
View file

@ -282,6 +282,99 @@ void splice_shrink_spd(struct splice_pipe_desc *spd)
kfree(spd->partial);
}
/*
* Splice data from an O_DIRECT file into pages and then add them to the output
* pipe.
*/
ssize_t direct_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
struct iov_iter to;
struct bio_vec *bv;
struct kiocb kiocb;
struct page **pages;
ssize_t ret;
size_t used, npages, chunk, remain, reclaim;
int i;
/* Work out how much data we can actually add into the pipe */
used = pipe_occupancy(pipe->head, pipe->tail);
npages = max_t(ssize_t, pipe->max_usage - used, 0);
len = min_t(size_t, len, npages * PAGE_SIZE);
npages = DIV_ROUND_UP(len, PAGE_SIZE);
bv = kzalloc(array_size(npages, sizeof(bv[0])) +
array_size(npages, sizeof(struct page *)), GFP_KERNEL);
if (!bv)
return -ENOMEM;
pages = (void *)(bv + npages);
npages = alloc_pages_bulk_array(GFP_USER, npages, pages);
if (!npages) {
kfree(bv);
return -ENOMEM;
}
remain = len = min_t(size_t, len, npages * PAGE_SIZE);
for (i = 0; i < npages; i++) {
chunk = min_t(size_t, PAGE_SIZE, remain);
bv[i].bv_page = pages[i];
bv[i].bv_offset = 0;
bv[i].bv_len = chunk;
remain -= chunk;
}
/* Do the I/O */
iov_iter_bvec(&to, ITER_DEST, bv, npages, len);
init_sync_kiocb(&kiocb, in);
kiocb.ki_pos = *ppos;
ret = call_read_iter(in, &kiocb, &to);
reclaim = npages * PAGE_SIZE;
remain = 0;
if (ret > 0) {
reclaim -= ret;
remain = ret;
*ppos = kiocb.ki_pos;
file_accessed(in);
} else if (ret < 0) {
/*
* callers of ->splice_read() expect -EAGAIN on
* "can't put anything in there", rather than -EFAULT.
*/
if (ret == -EFAULT)
ret = -EAGAIN;
}
/* Free any pages that didn't get touched at all. */
reclaim /= PAGE_SIZE;
if (reclaim) {
npages -= reclaim;
release_pages(pages + npages, reclaim);
}
/* Push the remaining pages into the pipe. */
for (i = 0; i < npages; i++) {
struct pipe_buffer *buf = pipe_head_buf(pipe);
chunk = min_t(size_t, remain, PAGE_SIZE);
*buf = (struct pipe_buffer) {
.ops = &default_pipe_buf_ops,
.page = bv[i].bv_page,
.offset = 0,
.len = chunk,
};
pipe->head++;
remain -= chunk;
}
kfree(bv);
return ret;
}
EXPORT_SYMBOL(direct_splice_read);
/**
* generic_file_splice_read - splice data from file to a pipe
* @in: file to splice from

6
include/linux/fs.h
View file

@ -2728,6 +2728,12 @@ ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb,
struct iov_iter *iter);
/* fs/splice.c */
ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags);
ssize_t direct_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags);
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
struct pipe_inode_info *, size_t, unsigned int);
extern ssize_t iter_file_splice_write(struct pipe_inode_info *,

8
include/linux/netfs.h
View file

@ -17,6 +17,7 @@
#include <linux/workqueue.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/uio.h>
enum netfs_sreq_ref_trace;
@ -296,6 +297,13 @@ void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
void netfs_put_subrequest(struct netfs_io_subrequest *subreq,
bool was_async, enum netfs_sreq_ref_trace what);
void netfs_stats_show(struct seq_file *);
ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,
struct iov_iter *new,
iov_iter_extraction_t extraction_flags);
struct sg_table;
ssize_t netfs_extract_iter_to_sg(struct iov_iter *iter, size_t len,
struct sg_table *sgtable, unsigned int sg_max,
iov_iter_extraction_t extraction_flags);
/**
* netfs_inode - Get the netfs inode context from the inode

10
include/linux/pagemap.h
View file

@ -977,16 +977,6 @@ static inline int folio_lock_killable(struct folio *folio)
return 0;
}
/*
* lock_page_killable is like lock_page but can be interrupted by fatal
* signals. It returns 0 if it locked the page and -EINTR if it was
* killed while waiting.
*/
static inline int lock_page_killable(struct page *page)
{
return folio_lock_killable(page_folio(page));
}
/*
* folio_lock_or_retry - Lock the folio, unless this would block and the
* caller indicated that it can handle a retry.

20
include/linux/pipe_fs_i.h
View file

@ -156,6 +156,26 @@ static inline bool pipe_full(unsigned int head, unsigned int tail,
return pipe_occupancy(head, tail) >= limit;
}
/**
* pipe_buf - Return the pipe buffer for the specified slot in the pipe ring
* @pipe: The pipe to access
* @slot: The slot of interest
*/
static inline struct pipe_buffer *pipe_buf(const struct pipe_inode_info *pipe,
unsigned int slot)
{
return &pipe->bufs[slot & (pipe->ring_size - 1)];
}
/**
* pipe_head_buf - Return the pipe buffer at the head of the pipe ring
* @pipe: The pipe to access
*/
static inline struct pipe_buffer *pipe_head_buf(const struct pipe_inode_info *pipe)
{
return pipe_buf(pipe, pipe->head);
}
/**
* pipe_buf_get - get a reference to a pipe_buffer
* @pipe: the pipe that the buffer belongs to

35
include/linux/uio.h
View file

@ -13,6 +13,8 @@
struct page;
struct pipe_inode_info;
typedef unsigned int __bitwise iov_iter_extraction_t;
struct kvec {
void *iov_base; /* and that should *never* hold a userland pointer */
size_t iov_len;
@ -252,12 +254,12 @@ void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *
loff_t start, size_t count);
ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,
size_t maxsize, unsigned maxpages, size_t *start,
unsigned gup_flags);
iov_iter_extraction_t extraction_flags);
ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages,
size_t maxsize, unsigned maxpages, size_t *start);
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize, size_t *start,
unsigned gup_flags);
iov_iter_extraction_t extraction_flags);
ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages,
size_t maxsize, size_t *start);
int iov_iter_npages(const struct iov_iter *i, int maxpages);
@ -360,5 +362,34 @@ static inline void iov_iter_ubuf(struct iov_iter *i, unsigned int direction,
.count = count
};
}
/* Flags for iov_iter_get/extract_pages*() */
/* Allow P2PDMA on the extracted pages */
#define ITER_ALLOW_P2PDMA ((__force iov_iter_extraction_t)0x01)
ssize_t iov_iter_extract_pages(struct iov_iter *i, struct page ***pages,
size_t maxsize, unsigned int maxpages,
iov_iter_extraction_t extraction_flags,
size_t *offset0);
/**
* iov_iter_extract_will_pin - Indicate how pages from the iterator will be retained
* @iter: The iterator
*
* Examine the iterator and indicate by returning true or false as to how, if
* at all, pages extracted from the iterator will be retained by the extraction
* function.
*
* %true indicates that the pages will have a pin placed in them that the
* caller must unpin. This is must be done for DMA/async DIO to force fork()
* to forcibly copy a page for the child (the parent must retain the original
* page).
*
* %false indicates that no measures are taken and that it's up to the caller
* to retain the pages.
*/
static inline bool iov_iter_extract_will_pin(const struct iov_iter *iter)
{
return user_backed_iter(iter);
}
#endif

284
lib/iov_iter.c
View file

@ -186,12 +186,6 @@ static int copyin(void *to, const void __user *from, size_t n)
return res;
}
static inline struct pipe_buffer *pipe_buf(const struct pipe_inode_info *pipe,
unsigned int slot)
{
return &pipe->bufs[slot & (pipe->ring_size - 1)];
}
#ifdef PIPE_PARANOIA
static bool sanity(const struct iov_iter *i)
{
@ -1432,9 +1426,9 @@ static struct page *first_bvec_segment(const struct iov_iter *i,
static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
unsigned int maxpages, size_t *start,
unsigned int gup_flags)
iov_iter_extraction_t extraction_flags)
{
unsigned int n;
unsigned int n, gup_flags = 0;
if (maxsize > i->count)
maxsize = i->count;
@ -1442,6 +1436,8 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
return 0;
if (maxsize > MAX_RW_COUNT)
maxsize = MAX_RW_COUNT;
if (extraction_flags & ITER_ALLOW_P2PDMA)
gup_flags |= FOLL_PCI_P2PDMA;
if (likely(user_backed_iter(i))) {
unsigned long addr;
@ -1495,14 +1491,14 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
ssize_t iov_iter_get_pages(struct iov_iter *i,
struct page **pages, size_t maxsize, unsigned maxpages,
size_t *start, unsigned gup_flags)
size_t *start, iov_iter_extraction_t extraction_flags)
{
if (!maxpages)
return 0;
BUG_ON(!pages);
return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages,
start, gup_flags);
start, extraction_flags);
}
EXPORT_SYMBOL_GPL(iov_iter_get_pages);
@ -1515,14 +1511,14 @@ EXPORT_SYMBOL(iov_iter_get_pages2);
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
size_t *start, unsigned gup_flags)
size_t *start, iov_iter_extraction_t extraction_flags)
{
ssize_t len;
*pages = NULL;
len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start,
gup_flags);
extraction_flags);
if (len <= 0) {
kvfree(*pages);
*pages = NULL;
@ -1925,3 +1921,267 @@ void iov_iter_restore(struct iov_iter *i, struct iov_iter_state *state)
i->iov -= state->nr_segs - i->nr_segs;
i->nr_segs = state->nr_segs;
}
/*
* Extract a list of contiguous pages from an ITER_XARRAY iterator. This does not
* get references on the pages, nor does it get a pin on them.
*/
static ssize_t iov_iter_extract_xarray_pages(struct iov_iter *i,
struct page ***pages, size_t maxsize,
unsigned int maxpages,
iov_iter_extraction_t extraction_flags,
size_t *offset0)
{
struct page *page, **p;
unsigned int nr = 0, offset;
loff_t pos = i->xarray_start + i->iov_offset;
pgoff_t index = pos >> PAGE_SHIFT;
XA_STATE(xas, i->xarray, index);
offset = pos & ~PAGE_MASK;
*offset0 = offset;
maxpages = want_pages_array(pages, maxsize, offset, maxpages);
if (!maxpages)
return -ENOMEM;
p = *pages;
rcu_read_lock();
for (page = xas_load(&xas); page; page = xas_next(&xas)) {
if (xas_retry(&xas, page))
continue;
/* Has the page moved or been split? */
if (unlikely(page != xas_reload(&xas))) {
xas_reset(&xas);
continue;
}
p[nr++] = find_subpage(page, xas.xa_index);
if (nr == maxpages)
break;
}
rcu_read_unlock();
maxsize = min_t(size_t, nr * PAGE_SIZE - offset, maxsize);
iov_iter_advance(i, maxsize);
return maxsize;
}
/*
* Extract a list of contiguous pages from an ITER_BVEC iterator. This does
* not get references on the pages, nor does it get a pin on them.
*/
static ssize_t iov_iter_extract_bvec_pages(struct iov_iter *i,
struct page ***pages, size_t maxsize,
unsigned int maxpages,
iov_iter_extraction_t extraction_flags,
size_t *offset0)
{
struct page **p, *page;
size_t skip = i->iov_offset, offset;
int k;
for (;;) {
if (i->nr_segs == 0)
return 0;
maxsize = min(maxsize, i->bvec->bv_len - skip);
if (maxsize)
break;
i->iov_offset = 0;
i->nr_segs--;
i->bvec++;
skip = 0;
}
skip += i->bvec->bv_offset;
page = i->bvec->bv_page + skip / PAGE_SIZE;
offset = skip % PAGE_SIZE;
*offset0 = offset;
maxpages = want_pages_array(pages, maxsize, offset, maxpages);
if (!maxpages)
return -ENOMEM;
p = *pages;
for (k = 0; k < maxpages; k++)
p[k] = page + k;
maxsize = min_t(size_t, maxsize, maxpages * PAGE_SIZE - offset);
iov_iter_advance(i, maxsize);
return maxsize;
}
/*
* Extract a list of virtually contiguous pages from an ITER_KVEC iterator.
* This does not get references on the pages, nor does it get a pin on them.
*/
static ssize_t iov_iter_extract_kvec_pages(struct iov_iter *i,
struct page ***pages, size_t maxsize,
unsigned int maxpages,
iov_iter_extraction_t extraction_flags,
size_t *offset0)
{
struct page **p, *page;
const void *kaddr;
size_t skip = i->iov_offset, offset, len;
int k;
for (;;) {
if (i->nr_segs == 0)
return 0;
maxsize = min(maxsize, i->kvec->iov_len - skip);
if (maxsize)
break;
i->iov_offset = 0;
i->nr_segs--;
i->kvec++;
skip = 0;
}
kaddr = i->kvec->iov_base + skip;
offset = (unsigned long)kaddr & ~PAGE_MASK;
*offset0 = offset;
maxpages = want_pages_array(pages, maxsize, offset, maxpages);
if (!maxpages)
return -ENOMEM;
p = *pages;
kaddr -= offset;
len = offset + maxsize;
for (k = 0; k < maxpages; k++) {
size_t seg = min_t(size_t, len, PAGE_SIZE);
if (is_vmalloc_or_module_addr(kaddr))
page = vmalloc_to_page(kaddr);
else
page = virt_to_page(kaddr);
p[k] = page;
len -= seg;
kaddr += PAGE_SIZE;
}
maxsize = min_t(size_t, maxsize, maxpages * PAGE_SIZE - offset);
iov_iter_advance(i, maxsize);
return maxsize;
}
/*
* Extract a list of contiguous pages from a user iterator and get a pin on
* each of them. This should only be used if the iterator is user-backed
* (IOBUF/UBUF).
*
* It does not get refs on the pages, but the pages must be unpinned by the
* caller once the transfer is complete.
*
* This is safe to be used where background IO/DMA *is* going to be modifying
* the buffer; using a pin rather than a ref makes forces fork() to give the
* child a copy of the page.
*/
static ssize_t iov_iter_extract_user_pages(struct iov_iter *i,
struct page ***pages,
size_t maxsize,
unsigned int maxpages,
iov_iter_extraction_t extraction_flags,
size_t *offset0)
{
unsigned long addr;
unsigned int gup_flags = 0;
size_t offset;
int res;
if (i->data_source == ITER_DEST)
gup_flags |= FOLL_WRITE;
if (extraction_flags & ITER_ALLOW_P2PDMA)
gup_flags |= FOLL_PCI_P2PDMA;
if (i->nofault)
gup_flags |= FOLL_NOFAULT;
addr = first_iovec_segment(i, &maxsize);
*offset0 = offset = addr % PAGE_SIZE;
addr &= PAGE_MASK;
maxpages = want_pages_array(pages, maxsize, offset, maxpages);
if (!maxpages)
return -ENOMEM;
res = pin_user_pages_fast(addr, maxpages, gup_flags, *pages);
if (unlikely(res <= 0))
return res;
maxsize = min_t(size_t, maxsize, res * PAGE_SIZE - offset);
iov_iter_advance(i, maxsize);
return maxsize;
}
/**
* iov_iter_extract_pages - Extract a list of contiguous pages from an iterator
* @i: The iterator to extract from
* @pages: Where to return the list of pages
* @maxsize: The maximum amount of iterator to extract
* @maxpages: The maximum size of the list of pages
* @extraction_flags: Flags to qualify request
* @offset0: Where to return the starting offset into (*@pages)[0]
*
* Extract a list of contiguous pages from the current point of the iterator,
* advancing the iterator. The maximum number of pages and the maximum amount
* of page contents can be set.
*
* If *@pages is NULL, a page list will be allocated to the required size and
* *@pages will be set to its base. If *@pages is not NULL, it will be assumed
* that the caller allocated a page list at least @maxpages in size and this
* will be filled in.
*
* @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA
* be allowed on the pages extracted.
*
* The iov_iter_extract_will_pin() function can be used to query how cleanup
* should be performed.
*
* Extra refs or pins on the pages may be obtained as follows:
*
* (*) If the iterator is user-backed (ITER_IOVEC/ITER_UBUF), pins will be
* added to the pages, but refs will not be taken.
* iov_iter_extract_will_pin() will return true.
*
* (*) If the iterator is ITER_KVEC, ITER_BVEC or ITER_XARRAY, the pages are
* merely listed; no extra refs or pins are obtained.
* iov_iter_extract_will_pin() will return 0.
*
* Note also:
*
* (*) Use with ITER_DISCARD is not supported as that has no content.
*
* On success, the function sets *@pages to the new pagelist, if allocated, and
* sets *offset0 to the offset into the first page.
*
* It may also return -ENOMEM and -EFAULT.
*/
ssize_t iov_iter_extract_pages(struct iov_iter *i,
struct page ***pages,
size_t maxsize,
unsigned int maxpages,
iov_iter_extraction_t extraction_flags,
size_t *offset0)
{
maxsize = min_t(size_t, min_t(size_t, maxsize, i->count), MAX_RW_COUNT);
if (!maxsize)
return 0;
if (likely(user_backed_iter(i)))
return iov_iter_extract_user_pages(i, pages, maxsize,
maxpages, extraction_flags,
offset0);
if (iov_iter_is_kvec(i))
return iov_iter_extract_kvec_pages(i, pages, maxsize,
maxpages, extraction_flags,
offset0);
if (iov_iter_is_bvec(i))
return iov_iter_extract_bvec_pages(i, pages, maxsize,
maxpages, extraction_flags,
offset0);
if (iov_iter_is_xarray(i))
return iov_iter_extract_xarray_pages(i, pages, maxsize,
maxpages, extraction_flags,
offset0);
return -EFAULT;
}
EXPORT_SYMBOL_GPL(iov_iter_extract_pages);

157
mm/filemap.c
View file

@ -42,6 +42,8 @@
#include <linux/ramfs.h>
#include <linux/page_idle.h>
#include <linux/migrate.h>
#include <linux/pipe_fs_i.h>
#include <linux/splice.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include "internal.h"
@ -2440,21 +2442,19 @@ static int filemap_read_folio(struct file *file, filler_t filler,
}
static bool filemap_range_uptodate(struct address_space *mapping,
loff_t pos, struct iov_iter *iter, struct folio *folio)
loff_t pos, size_t count, struct folio *folio,
bool need_uptodate)
{
int count;
if (folio_test_uptodate(folio))
return true;
/* pipes can't handle partially uptodate pages */
if (iov_iter_is_pipe(iter))
if (need_uptodate)
return false;
if (!mapping->a_ops->is_partially_uptodate)
return false;
if (mapping->host->i_blkbits >= folio_shift(folio))
return false;
count = iter->count;
if (folio_pos(folio) > pos) {
count -= folio_pos(folio) - pos;
pos = 0;
@ -2466,8 +2466,8 @@ static bool filemap_range_uptodate(struct address_space *mapping,
}
static int filemap_update_page(struct kiocb *iocb,
struct address_space *mapping, struct iov_iter *iter,
struct folio *folio)
struct address_space *mapping, size_t count,
struct folio *folio, bool need_uptodate)
{
int error;
@ -2501,7 +2501,8 @@ static int filemap_update_page(struct kiocb *iocb,
goto unlock;
error = 0;
if (filemap_range_uptodate(mapping, iocb->ki_pos, iter, folio))
if (filemap_range_uptodate(mapping, iocb->ki_pos, count, folio,
need_uptodate))
goto unlock;
error = -EAGAIN;
@ -2577,8 +2578,8 @@ static int filemap_readahead(struct kiocb *iocb, struct file *file,
return 0;
}
static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
struct folio_batch *fbatch)
static int filemap_get_pages(struct kiocb *iocb, size_t count,
struct folio_batch *fbatch, bool need_uptodate)
{
struct file *filp = iocb->ki_filp;
struct address_space *mapping = filp->f_mapping;
@ -2589,7 +2590,7 @@ static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
int err = 0;
/* "last_index" is the index of the page beyond the end of the read */
last_index = DIV_ROUND_UP(iocb->ki_pos + iter->count, PAGE_SIZE);
last_index = DIV_ROUND_UP(iocb->ki_pos + count, PAGE_SIZE);
retry:
if (fatal_signal_pending(current))
return -EINTR;
@ -2622,7 +2623,8 @@ static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
if ((iocb->ki_flags & IOCB_WAITQ) &&
folio_batch_count(fbatch) > 1)
iocb->ki_flags |= IOCB_NOWAIT;
err = filemap_update_page(iocb, mapping, iter, folio);
err = filemap_update_page(iocb, mapping, count, folio,
need_uptodate);
if (err)
goto err;
}
@ -2692,7 +2694,8 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
if (unlikely(iocb->ki_pos >= i_size_read(inode)))
break;
error = filemap_get_pages(iocb, iter, &fbatch);
error = filemap_get_pages(iocb, iter->count, &fbatch,
iov_iter_is_pipe(iter));
if (error < 0)
break;
@ -2842,6 +2845,134 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
}
EXPORT_SYMBOL(generic_file_read_iter);
/*
* Splice subpages from a folio into a pipe.
*/
size_t splice_folio_into_pipe(struct pipe_inode_info *pipe,
struct folio *folio, loff_t fpos, size_t size)
{
struct page *page;
size_t spliced = 0, offset = offset_in_folio(folio, fpos);
page = folio_page(folio, offset / PAGE_SIZE);
size = min(size, folio_size(folio) - offset);
offset %= PAGE_SIZE;
while (spliced < size &&
!pipe_full(pipe->head, pipe->tail, pipe->max_usage)) {
struct pipe_buffer *buf = pipe_head_buf(pipe);
size_t part = min_t(size_t, PAGE_SIZE - offset, size - spliced);
*buf = (struct pipe_buffer) {
.ops = &page_cache_pipe_buf_ops,
.page = page,
.offset = offset,
.len = part,
};
folio_get(folio);
pipe->head++;
page++;
spliced += part;
offset = 0;
}
return spliced;
}
/*
* Splice folios from the pagecache of a buffered (ie. non-O_DIRECT) file into
* a pipe.
*/
ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
struct folio_batch fbatch;
struct kiocb iocb;
size_t total_spliced = 0, used, npages;
loff_t isize, end_offset;
bool writably_mapped;
int i, error = 0;
init_sync_kiocb(&iocb, in);
iocb.ki_pos = *ppos;
/* Work out how much data we can actually add into the pipe */
used = pipe_occupancy(pipe->head, pipe->tail);
npages = max_t(ssize_t, pipe->max_usage - used, 0);
len = min_t(size_t, len, npages * PAGE_SIZE);
folio_batch_init(&fbatch);
do {
cond_resched();
if (*ppos >= i_size_read(file_inode(in)))
break;
iocb.ki_pos = *ppos;
error = filemap_get_pages(&iocb, len, &fbatch, true);
if (error < 0)
break;
/*
* i_size must be checked after we know the pages are Uptodate.
*
* Checking i_size after the check allows us to calculate
* the correct value for "nr", which means the zero-filled
* part of the page is not copied back to userspace (unless
* another truncate extends the file - this is desired though).
*/
isize = i_size_read(file_inode(in));
if (unlikely(*ppos >= isize))
break;
end_offset = min_t(loff_t, isize, *ppos + len);
/*
* Once we start copying data, we don't want to be touching any
* cachelines that might be contended:
*/
writably_mapped = mapping_writably_mapped(in->f_mapping);
for (i = 0; i < folio_batch_count(&fbatch); i++) {
struct folio *folio = fbatch.folios[i];
size_t n;
if (folio_pos(folio) >= end_offset)
goto out;
folio_mark_accessed(folio);
/*
* If users can be writing to this folio using arbitrary
* virtual addresses, take care of potential aliasing
* before reading the folio on the kernel side.
*/
if (writably_mapped)
flush_dcache_folio(folio);
n = min_t(loff_t, len, isize - *ppos);
n = splice_folio_into_pipe(pipe, folio, *ppos, n);
if (!n)
goto out;
len -= n;
total_spliced += n;
*ppos += n;
in->f_ra.prev_pos = *ppos;
if (pipe_full(pipe->head, pipe->tail, pipe->max_usage))
goto out;
}
folio_batch_release(&fbatch);
} while (len);
out:
folio_batch_release(&fbatch);
file_accessed(in);
return total_spliced ? total_spliced : error;
}
EXPORT_SYMBOL(filemap_splice_read);
static inline loff_t folio_seek_hole_data(struct xa_state *xas,
struct address_space *mapping, struct folio *folio,
loff_t start, loff_t end, bool seek_data)

6
mm/internal.h
View file

@ -794,6 +794,12 @@ struct migration_target_control {
gfp_t gfp_mask;
};
/*
* mm/filemap.c
*/
size_t splice_folio_into_pipe(struct pipe_inode_info *pipe,
struct folio *folio, loff_t fpos, size_t size);
/*
* mm/vmalloc.c
*/

1
mm/vmalloc.c
View file

@ -656,6 +656,7 @@ int is_vmalloc_or_module_addr(const void *x)
#endif
return is_vmalloc_addr(x);
}
EXPORT_SYMBOL_GPL(is_vmalloc_or_module_addr);
/*
* Walk a vmap address to the struct page it maps. Huge vmap mappings will