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authorLi Zefan <lizefan@huawei.com>2014-02-14 16:57:27 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-14 14:31:37 -0800
commitf41c593454943b80a2017c8a2a3d6b1d0b0a6f89 (patch)
tree3ecd1f3669b51386a716115a2da6809048149ce7 /fs/kernfs/dir.c
parent9383f4c6b66256c039c65ddc141f0caeeae51847 (diff)
downloadlinux-f41c593454943b80a2017c8a2a3d6b1d0b0a6f89.tar.bz2
kernfs: fix kernfs_node_from_dentry()
Currently kernfs_node_from_dentry() returns NULL for root dentry, because root_dentry->d_op == NULL. Due to this bug cgroupstats_build() returns -EINVAL for root cgroup. # mount -t cgroup -o cpuacct /cgroup # Documentation/accounting/getdelays -C /cgroup fatal reply error, errno -22 With this fix: # Documentation/accounting/getdelays -C /cgroup sleeping 305, blocked 0, running 1, stopped 0, uninterruptible 1 Signed-off-by: Li Zefan <lizefan@huawei.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs/dir.c')
-rw-r--r--fs/kernfs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index a0f99b7f84b2..8245d3b34894 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -500,7 +500,7 @@ const struct dentry_operations kernfs_dops = {
*/
struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry)
{
- if (dentry->d_op == &kernfs_dops)
+ if (dentry->d_sb->s_op == &kernfs_sops)
return dentry->d_fsdata;
return NULL;
}