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NFSv4: nfs_atomic_open() can race when looking up a non-regular file

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commit 1751fc1db36f6f411709e143d5393f92d12137a9 upstream.

If the file type changes back to being a regular file on the server
between the failed OPEN and our LOOKUP, then we need to re-run the OPEN.

Fixes: 0dd2b474d0b6 ("nfs: implement i_op->atomic_open()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2022-01-06 18:24:03 -05:00 committed by Greg Kroah-Hartman
parent 8788981e12
commit e3fef0d7ee
1 changed files with 5 additions and 0 deletions
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5
fs/nfs/dir.c
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@ -1607,12 +1607,17 @@ no_open:
if ((lookup_flags & LOOKUP_DIRECTORY) && inode &&
!S_ISDIR(inode->i_mode))
res = ERR_PTR(-ENOTDIR);
else if (inode && S_ISREG(inode->i_mode))
res = ERR_PTR(-EOPENSTALE);
} else if (!IS_ERR(res)) {
inode = d_inode(res);
if ((lookup_flags & LOOKUP_DIRECTORY) && inode &&
!S_ISDIR(inode->i_mode)) {
dput(res);
res = ERR_PTR(-ENOTDIR);
} else if (inode && S_ISREG(inode->i_mode)) {
dput(res);
res = ERR_PTR(-EOPENSTALE);
}
}
if (switched) {