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NFSv4.2: Serialise O_DIRECT i/o and clone range 

[ Upstream commit c80ebeba11 ]

Ensure that all O_DIRECT reads and writes complete before cloning a file
range, so that both the source and destination are up to date.

Fixes: a5864c999d ("NFS: Do not serialise O_DIRECT reads and writes")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2025-09-06 10:40:24 -04:00 committed by Greg Kroah-Hartman
parent 5eb9e22919
commit fc0e6342ad
1 changed files with 2 additions and 0 deletions
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2
fs/nfs/nfs4file.c
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@ -283,9 +283,11 @@ static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
/* flush all pending writes on both src and dst so that server
* has the latest data */
nfs_file_block_o_direct(NFS_I(src_inode));
ret = nfs_sync_inode(src_inode);
if (ret)
goto out_unlock;
nfs_file_block_o_direct(NFS_I(dst_inode));
ret = nfs_sync_inode(dst_inode);
if (ret)
goto out_unlock;