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autofs4: deal with autofs4_write/autofs4_write races

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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>
This commit is contained in:
Al Viro
2012-01-10 22:35:38 -05:00
parent 8753333266
commit d668dc5663
3 changed files with 7 additions and 4 deletions
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1
fs/autofs4/inode.c
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@ -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);