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[PATCH] autofs4: tree race fix

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For tree mount maps, a call to chdir or chroot, to a directory above the
moint point directories at a certain time during the expire results in the
expire incorrectly thinking the tree is not busy.  This patch adds a check
to see if the filesystem above the tree mount points is busy and also locks
the filesystem during the tree mount expire to prevent the race.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ian Kent 2005-05-01 08:59:17 -07:00 • committed by Linus Torvalds
parent 4dcd00b181
commit 3a9720ce73
3 changed files with 27 additions and 4 deletions
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1
fs/autofs4/inode.c
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@ -206,6 +206,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
sbi->version = 0;
sbi->sub_version = 0;
init_MUTEX(&sbi->wq_sem);
spin_lock_init(&sbi->fs_lock);
sbi->queues = NULL;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;