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authorEric W. Biederman <ebiederm@xmission.com>2009-01-21 11:55:11 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:38:24 -0700
commit4a67a1bc0b3a0db017b560cee27370d141c58e25 (patch)
treeab039581d41c9fa45a1bac9eb843baa1312a5969
parent8231f2f99a5e5fc45a25e8de09fd1ab9711babf1 (diff)
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sysfs: Take sysfs_mutex when fetching the root inode.
sysfs_get_inode ultimately calls sysfs_count_nlink when the a directory inode is fectched. sysfs_count_nlink needs to be called under the sysfs_mutex to guard against the unlikely but possible scenario that the root directory is changing as we are counting the number entries in it, and just in general to be consistent. Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/sysfs/mount.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 8133ca36ee0..84ef378673a 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -52,7 +52,9 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
sysfs_sb = sb;
/* get root inode, initialize and unlock it */
+ mutex_lock(&sysfs_mutex);
inode = sysfs_get_inode(&sysfs_root);
+ mutex_unlock(&sysfs_mutex);
if (!inode) {
pr_debug("sysfs: could not get root inode\n");
return -ENOMEM;