path: root/arch/arm/mach-omap2/devices.c
diff options
authorAl Viro <>2011-11-07 21:21:26 +0000
committerLinus Torvalds <>2011-11-07 14:58:06 -0800
commita3fbbde70a0cec017f2431e8f8de208708c76acc (patch)
treef584856e638ca916a8aca32eda58a8fe89722c9f /arch/arm/mach-omap2/devices.c
parent54a0f91301950af3d6ae2ff2bf710c9c68a9bfea (diff)
VFS: we need to set LOOKUP_JUMPED on mountpoint crossing
Mountpoint crossing is similar to following procfs symlinks - we do not get ->d_revalidate() called for dentry we have arrived at, with unpleasant consequences for NFS4. Simple way to reproduce the problem in mainline: cat >/tmp/a.c <<'EOF' #include <unistd.h> #include <fcntl.h> #include <stdio.h> main() { struct flock fl = {.l_type = F_RDLCK, .l_whence = SEEK_SET, .l_len = 1}; if (fcntl(0, F_SETLK, &fl)) perror("setlk"); } EOF cc /tmp/a.c -o /tmp/test then on nfs4: mount --bind file1 file2 /tmp/test < file1 # ok /tmp/test < file2 # spews "setlk: No locks available"... What happens is the missing call of ->d_revalidate() after mountpoint crossing and that's where NFS4 would issue OPEN request to server. The fix is simple - treat mountpoint crossing the same way we deal with following procfs-style symlinks. I.e. set LOOKUP_JUMPED... Cc: Signed-off-by: Al Viro <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'arch/arm/mach-omap2/devices.c')
0 files changed, 0 insertions, 0 deletions