linux/fs/erofs/inode.c
Jeffle Xu 0130e4e8e4 erofs: leave compressed inodes unsupported in fscache mode for now
erofs over fscache doesn't support the compressed layout yet. It will
cause NULL crash if there are compressed inodes contained when working
in fscache mode.

So far in the erofs based container image distribution scenarios
(RAFS v6), the compressed RAFS v6 images are downloaded and then
decompressed on demand as an uncompressed erofs image. Then the erofs
image is mounted in fscache mode for containers to use. IOWs, currently
compressed data is decompressed on the userspace side instead and
uncompressed erofs images will be finally cached.

The fscache support for the compressed layout is still under
development and it will be used for runtime decompression feature.
Anyway, to avoid the potential crash, let's leave the compressed inodes
unsupported in fscache mode until we support it later.

Fixes: 1442b02b66 ("erofs: implement fscache-based data read for non-inline layout")
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220526010344.118493-1-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2022-05-29 15:34:54 +08:00

399 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017-2018 HUAWEI, Inc.
* https://www.huawei.com/
* Copyright (C) 2021, Alibaba Cloud
*/
#include "xattr.h"
#include <trace/events/erofs.h>
static void *erofs_read_inode(struct erofs_buf *buf,
struct inode *inode, unsigned int *ofs)
{
struct super_block *sb = inode->i_sb;
struct erofs_sb_info *sbi = EROFS_SB(sb);
struct erofs_inode *vi = EROFS_I(inode);
const erofs_off_t inode_loc = iloc(sbi, vi->nid);
erofs_blk_t blkaddr, nblks = 0;
void *kaddr;
struct erofs_inode_compact *dic;
struct erofs_inode_extended *die, *copied = NULL;
unsigned int ifmt;
int err;
blkaddr = erofs_blknr(inode_loc);
*ofs = erofs_blkoff(inode_loc);
erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u",
__func__, vi->nid, *ofs, blkaddr);
kaddr = erofs_read_metabuf(buf, sb, blkaddr, EROFS_KMAP);
if (IS_ERR(kaddr)) {
erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
vi->nid, PTR_ERR(kaddr));
return kaddr;
}
dic = kaddr + *ofs;
ifmt = le16_to_cpu(dic->i_format);
if (ifmt & ~EROFS_I_ALL) {
erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu",
ifmt, vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
vi->datalayout = erofs_inode_datalayout(ifmt);
if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
vi->datalayout, vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
switch (erofs_inode_version(ifmt)) {
case EROFS_INODE_LAYOUT_EXTENDED:
vi->inode_isize = sizeof(struct erofs_inode_extended);
/* check if the extended inode acrosses block boundary */
if (*ofs + vi->inode_isize <= EROFS_BLKSIZ) {
*ofs += vi->inode_isize;
die = (struct erofs_inode_extended *)dic;
} else {
const unsigned int gotten = EROFS_BLKSIZ - *ofs;
copied = kmalloc(vi->inode_isize, GFP_NOFS);
if (!copied) {
err = -ENOMEM;
goto err_out;
}
memcpy(copied, dic, gotten);
kaddr = erofs_read_metabuf(buf, sb, blkaddr + 1,
EROFS_KMAP);
if (IS_ERR(kaddr)) {
erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",
vi->nid, PTR_ERR(kaddr));
kfree(copied);
return kaddr;
}
*ofs = vi->inode_isize - gotten;
memcpy((u8 *)copied + gotten, kaddr, *ofs);
die = copied;
}
vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
inode->i_mode = le16_to_cpu(die->i_mode);
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
case S_IFDIR:
case S_IFLNK:
vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr);
break;
case S_IFCHR:
case S_IFBLK:
inode->i_rdev =
new_decode_dev(le32_to_cpu(die->i_u.rdev));
break;
case S_IFIFO:
case S_IFSOCK:
inode->i_rdev = 0;
break;
default:
goto bogusimode;
}
i_uid_write(inode, le32_to_cpu(die->i_uid));
i_gid_write(inode, le32_to_cpu(die->i_gid));
set_nlink(inode, le32_to_cpu(die->i_nlink));
/* extended inode has its own timestamp */
inode->i_ctime.tv_sec = le64_to_cpu(die->i_mtime);
inode->i_ctime.tv_nsec = le32_to_cpu(die->i_mtime_nsec);
inode->i_size = le64_to_cpu(die->i_size);
/* total blocks for compressed files */
if (erofs_inode_is_data_compressed(vi->datalayout))
nblks = le32_to_cpu(die->i_u.compressed_blocks);
else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
/* fill chunked inode summary info */
vi->chunkformat = le16_to_cpu(die->i_u.c.format);
kfree(copied);
copied = NULL;
break;
case EROFS_INODE_LAYOUT_COMPACT:
vi->inode_isize = sizeof(struct erofs_inode_compact);
*ofs += vi->inode_isize;
vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
inode->i_mode = le16_to_cpu(dic->i_mode);
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
case S_IFDIR:
case S_IFLNK:
vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr);
break;
case S_IFCHR:
case S_IFBLK:
inode->i_rdev =
new_decode_dev(le32_to_cpu(dic->i_u.rdev));
break;
case S_IFIFO:
case S_IFSOCK:
inode->i_rdev = 0;
break;
default:
goto bogusimode;
}
i_uid_write(inode, le16_to_cpu(dic->i_uid));
i_gid_write(inode, le16_to_cpu(dic->i_gid));
set_nlink(inode, le16_to_cpu(dic->i_nlink));
/* use build time for compact inodes */
inode->i_ctime.tv_sec = sbi->build_time;
inode->i_ctime.tv_nsec = sbi->build_time_nsec;
inode->i_size = le32_to_cpu(dic->i_size);
if (erofs_inode_is_data_compressed(vi->datalayout))
nblks = le32_to_cpu(dic->i_u.compressed_blocks);
else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
vi->chunkformat = le16_to_cpu(dic->i_u.c.format);
break;
default:
erofs_err(inode->i_sb,
"unsupported on-disk inode version %u of nid %llu",
erofs_inode_version(ifmt), vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
erofs_err(inode->i_sb,
"unsupported chunk format %x of nid %llu",
vi->chunkformat, vi->nid);
err = -EOPNOTSUPP;
goto err_out;
}
vi->chunkbits = LOG_BLOCK_SIZE +
(vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
}
inode->i_mtime.tv_sec = inode->i_ctime.tv_sec;
inode->i_atime.tv_sec = inode->i_ctime.tv_sec;
inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec;
inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec;
inode->i_flags &= ~S_DAX;
if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
vi->datalayout == EROFS_INODE_FLAT_PLAIN)
inode->i_flags |= S_DAX;
if (!nblks)
/* measure inode.i_blocks as generic filesystems */
inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
else
inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
return kaddr;
bogusimode:
erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
inode->i_mode, vi->nid);
err = -EFSCORRUPTED;
err_out:
DBG_BUGON(1);
kfree(copied);
erofs_put_metabuf(buf);
return ERR_PTR(err);
}
static int erofs_fill_symlink(struct inode *inode, void *kaddr,
unsigned int m_pofs)
{
struct erofs_inode *vi = EROFS_I(inode);
char *lnk;
/* if it cannot be handled with fast symlink scheme */
if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
inode->i_size >= EROFS_BLKSIZ) {
inode->i_op = &erofs_symlink_iops;
return 0;
}
lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
if (!lnk)
return -ENOMEM;
m_pofs += vi->xattr_isize;
/* inline symlink data shouldn't cross block boundary */
if (m_pofs + inode->i_size > EROFS_BLKSIZ) {
kfree(lnk);
erofs_err(inode->i_sb,
"inline data cross block boundary @ nid %llu",
vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
memcpy(lnk, kaddr + m_pofs, inode->i_size);
lnk[inode->i_size] = '\0';
inode->i_link = lnk;
inode->i_op = &erofs_fast_symlink_iops;
return 0;
}
static int erofs_fill_inode(struct inode *inode, int isdir)
{
struct erofs_inode *vi = EROFS_I(inode);
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
void *kaddr;
unsigned int ofs;
int err = 0;
trace_erofs_fill_inode(inode, isdir);
/* read inode base data from disk */
kaddr = erofs_read_inode(&buf, inode, &ofs);
if (IS_ERR(kaddr))
return PTR_ERR(kaddr);
/* setup the new inode */
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_op = &erofs_generic_iops;
if (erofs_inode_is_data_compressed(vi->datalayout))
inode->i_fop = &generic_ro_fops;
else
inode->i_fop = &erofs_file_fops;
break;
case S_IFDIR:
inode->i_op = &erofs_dir_iops;
inode->i_fop = &erofs_dir_fops;
break;
case S_IFLNK:
err = erofs_fill_symlink(inode, kaddr, ofs);
if (err)
goto out_unlock;
inode_nohighmem(inode);
break;
case S_IFCHR:
case S_IFBLK:
case S_IFIFO:
case S_IFSOCK:
inode->i_op = &erofs_generic_iops;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
goto out_unlock;
default:
err = -EFSCORRUPTED;
goto out_unlock;
}
if (erofs_inode_is_data_compressed(vi->datalayout)) {
if (!erofs_is_fscache_mode(inode->i_sb))
err = z_erofs_fill_inode(inode);
else
err = -EOPNOTSUPP;
goto out_unlock;
}
inode->i_mapping->a_ops = &erofs_raw_access_aops;
#ifdef CONFIG_EROFS_FS_ONDEMAND
if (erofs_is_fscache_mode(inode->i_sb))
inode->i_mapping->a_ops = &erofs_fscache_access_aops;
#endif
out_unlock:
erofs_put_metabuf(&buf);
return err;
}
/*
* erofs nid is 64bits, but i_ino is 'unsigned long', therefore
* we should do more for 32-bit platform to find the right inode.
*/
static int erofs_ilookup_test_actor(struct inode *inode, void *opaque)
{
const erofs_nid_t nid = *(erofs_nid_t *)opaque;
return EROFS_I(inode)->nid == nid;
}
static int erofs_iget_set_actor(struct inode *inode, void *opaque)
{
const erofs_nid_t nid = *(erofs_nid_t *)opaque;
inode->i_ino = erofs_inode_hash(nid);
return 0;
}
static inline struct inode *erofs_iget_locked(struct super_block *sb,
erofs_nid_t nid)
{
const unsigned long hashval = erofs_inode_hash(nid);
return iget5_locked(sb, hashval, erofs_ilookup_test_actor,
erofs_iget_set_actor, &nid);
}
struct inode *erofs_iget(struct super_block *sb,
erofs_nid_t nid,
bool isdir)
{
struct inode *inode = erofs_iget_locked(sb, nid);
if (!inode)
return ERR_PTR(-ENOMEM);
if (inode->i_state & I_NEW) {
int err;
struct erofs_inode *vi = EROFS_I(inode);
vi->nid = nid;
err = erofs_fill_inode(inode, isdir);
if (!err)
unlock_new_inode(inode);
else {
iget_failed(inode);
inode = ERR_PTR(err);
}
}
return inode;
}
int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path,
struct kstat *stat, u32 request_mask,
unsigned int query_flags)
{
struct inode *const inode = d_inode(path->dentry);
if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
stat->attributes |= STATX_ATTR_COMPRESSED;
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
STATX_ATTR_IMMUTABLE);
generic_fillattr(mnt_userns, inode, stat);
return 0;
}
const struct inode_operations erofs_generic_iops = {
.getattr = erofs_getattr,
.listxattr = erofs_listxattr,
.get_acl = erofs_get_acl,
.fiemap = erofs_fiemap,
};
const struct inode_operations erofs_symlink_iops = {
.get_link = page_get_link,
.getattr = erofs_getattr,
.listxattr = erofs_listxattr,
.get_acl = erofs_get_acl,
};
const struct inode_operations erofs_fast_symlink_iops = {
.get_link = simple_get_link,
.getattr = erofs_getattr,
.listxattr = erofs_listxattr,
.get_acl = erofs_get_acl,
};