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authorDavid Howells <dhowells@redhat.com>2006-10-28 10:38:46 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-28 11:30:53 -0700
commitf87135762de4328c6f17897e803e6909bc056feb (patch)
treebf182df7b7ca8326c7ed3590693ac1e276b24a14
parent6eac3f93f5e6b7256fb20b7608d62ec192da12be (diff)
[PATCH] VFS: Fix an error in unused dentry counting
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>
-rw-r--r--fs/dcache.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index a5b76b647c6..fd4a428998e 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -557,6 +557,7 @@ repeat:
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);
}
/*