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ceph: add object version support for sync read

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Turn the guts of ceph_sync_read into a new helper that takes an inode
and an offset instead of a kiocb struct, and make ceph_sync_read call
the helper as a wrapper.

Make the new helper always return the last object's version.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2022-08-25 09:31:12 -04:00 committed by Ilya Dryomov
parent 4e8c4c2355
commit d4d5188715
2 changed files with 35 additions and 12 deletions
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44
fs/ceph/file.c
View file

@ -959,22 +959,24 @@ enum {
* If we get a short result from the OSD, check against i_size; we need to
* only return a short read to the caller if we hit EOF.
*/
static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
int *retry_op)
ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
struct iov_iter *to, int *retry_op,
u64 *last_objver)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_osd_client *osdc = &fsc->client->osdc;
ssize_t ret;
u64 off = iocb->ki_pos;
u64 off = *ki_pos;
u64 len = iov_iter_count(to);
u64 i_size = i_size_read(inode);
bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
u64 objver = 0;
dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
dout("sync_read on inode %p %llx~%llx\n", inode, *ki_pos, len);
if (ceph_inode_is_shutdown(inode))
return -EIO;
if (!len)
return 0;
@ -1042,6 +1044,9 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
req->r_end_latency,
len, ret);
if (ret > 0)
objver = req->r_version;
i_size = i_size_read(inode);
dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
off, len, ret, i_size, (more ? " MORE" : ""));
@ -1092,21 +1097,36 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
break;
}
if (off > iocb->ki_pos) {
if (off > *ki_pos) {
if (off >= i_size) {
*retry_op = CHECK_EOF;
ret = i_size - iocb->ki_pos;
iocb->ki_pos = i_size;
ret = i_size - *ki_pos;
*ki_pos = i_size;
} else {
ret = off - iocb->ki_pos;
iocb->ki_pos = off;
ret = off - *ki_pos;
*ki_pos = off;
}
}
if (last_objver && ret > 0)
*last_objver = objver;
dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
return ret;
}
static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
int *retry_op)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
dout("sync_read on file %p %llx~%zx %s\n", file, iocb->ki_pos,
iov_iter_count(to), (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
}
struct ceph_aio_request {
struct kiocb *iocb;
size_t total_len;

3
fs/ceph/super.h
View file

@ -1300,6 +1300,9 @@ extern int ceph_renew_caps(struct inode *inode, int fmode);
extern int ceph_open(struct inode *inode, struct file *file);
extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags, umode_t mode);
extern ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
struct iov_iter *to, int *retry_op,
u64 *last_objver);
extern int ceph_release(struct inode *inode, struct file *filp);
extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
char *data, size_t len);