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[PATCH] VFS: Fix an error in unused dentry counting

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With Vasily Averin <vvs@sw.ru>

Fix an error in unused dentry counting in shrink_dcache_for_umount_subtree()
in which the count is modified without the dcache_lock held.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Vasily Averin <vvs@sw.ru>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells 2006-10-28 10:38:46 -07:00 committed by Linus Torvalds
parent 6eac3f93f5
commit f87135762d
1 changed files with 8 additions and 2 deletions
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10
fs/dcache.c
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@ -557,6 +557,7 @@ void shrink_dcache_sb(struct super_block * sb)
static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
{
struct dentry *parent;
unsigned detached = 0;
BUG_ON(!IS_ROOT(dentry));
@ -621,7 +622,7 @@ static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
atomic_dec(&parent->d_count);
list_del(&dentry->d_u.d_child);
dentry_stat.nr_dentry--; /* For d_free, below */
detached++;
inode = dentry->d_inode;
if (inode) {
@ -639,7 +640,7 @@ static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
* otherwise we ascend to the parent and move to the
* next sibling if there is one */
if (!parent)
return;
goto out;
dentry = parent;
@ -648,6 +649,11 @@ static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
dentry = list_entry(dentry->d_subdirs.next,
struct dentry, d_u.d_child);
}
out:
/* several dentries were freed, need to correct nr_dentry */
spin_lock(&dcache_lock);
dentry_stat.nr_dentry -= detached;
spin_unlock(&dcache_lock);
}
/*