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author | Miklos Szeredi <mszeredi@suse.cz> | 2012-05-21 17:30:20 +0200 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-06-01 12:12:02 -0400 |
commit | 0ef97dcfce4179a2eba046b855ee2f91d6f1b414 (patch) | |
tree | d5a29275a427dafd8fce0131b58f215c6252d3e2 /ipc | |
parent | 16b1c1cd71176ab0a76b26818fbf12db9183ed57 (diff) | |
download | linux-stable-0ef97dcfce4179a2eba046b855ee2f91d6f1b414.tar.gz linux-stable-0ef97dcfce4179a2eba046b855ee2f91d6f1b414.tar.bz2 linux-stable-0ef97dcfce4179a2eba046b855ee2f91d6f1b414.zip |
nfs: don't open in ->d_revalidate
NFSv4 can't do reliable opens in d_revalidate, since it cannot know whether a
mount needs to be followed or not. It does check d_mountpoint() on the dentry,
which can result in a weird error if the VFS found that the mount does not in
fact need to be followed, e.g.:
# mount --bind /mnt/nfs /mnt/nfs-clone
# echo something > /mnt/nfs/tmp/bar
# echo x > /tmp/file
# mount --bind /tmp/file /mnt/nfs-clone/tmp/bar
# cat /mnt/nfs/tmp/bar
cat: /mnt/nfs/tmp/bar: Not a directory
Which should, by any sane filesystem, result in "something" being printed.
So instead do the open in f_op->open() and in the unlikely case that the cached
dentry turned out to be invalid, drop the dentry and return EOPENSTALE to let
the VFS retry.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions