[RFC PATCH v11 38/51] ceph: add object version support for sync read

Jeff Layton
2022-03-22T14:16:32Z

From: Xiubo Li <xiubli@redhat.com>

Always return the last object's version.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/ceph/file.c | 12 ++++++++++--
fs/ceph/super.h | 3 ++-
2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 0e91ae995f78..1985e3102533 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -924,7 +924,8 @@ enum {
* only return a short read to the caller if we hit EOF.
*/
ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
- struct iov_iter *to, int *retry_op)
+ struct iov_iter *to, int *retry_op,
+ u64 *last_objver)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
@@ -934,6 +935,7 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *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 inode %p %llx~%llx\n", inode, *ki_pos, len);

@@ -1004,6 +1006,9 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
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" : ""));
@@ -1065,6 +1070,9 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
}
}

+ if (last_objver && ret > 0)
+ *last_objver = objver;
+
dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
return ret;
}
@@ -1078,7 +1086,7 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
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);
+ return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
}

struct ceph_aio_request {
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 339284e90cb3..e3d63b727e52 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1267,7 +1267,8 @@ 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);
+ 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);
--
2.35.1