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authorAl Viro <viro@zeniv.linux.org.uk>2012-01-10 22:35:38 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-11 00:20:12 -0500
commitd668dc56631da067540b2494d2a1f29ff7b5f15a (patch)
tree303ad17208838e8b9b1752f9427d55c84555f0f0 /fs/autofs4/inode.c
parent8753333266be67ff3a984ac1f6566d31c260bee4 (diff)
downloadop-kernel-dev-d668dc56631da067540b2494d2a1f29ff7b5f15a.zip
op-kernel-dev-d668dc56631da067540b2494d2a1f29ff7b5f15a.tar.gz
autofs4: deal with autofs4_write/autofs4_write races
Just serialize the actual writing of packets into pipe on a new mutex, independent from everything else in the locking hierarchy. As soon as something has started feeding a piece of packet into the pipe to daemon, we *want* everything else about to try the same to wait until we are done. Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/autofs4/inode.c')
-rw-r--r--fs/autofs4/inode.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 2ba44c7..e16980b 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -225,6 +225,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
sbi->min_proto = 0;
sbi->max_proto = 0;
mutex_init(&sbi->wq_mutex);
+ mutex_init(&sbi->pipe_mutex);
spin_lock_init(&sbi->fs_lock);
sbi->queues = NULL;
spin_lock_init(&sbi->lookup_lock);
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