| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.16 115/200] NFSv4: nfs_atomic_open() can race when looking up a non-regular file | Date | Mon, 31 Jan 2022 11:56:18 +0100 |
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From: Trond Myklebust <trond.myklebust@hammerspace.com>
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> --- fs/nfs/dir.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1972,12 +1972,17 @@ 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) {
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