[PATCH 54/75] sysfs: fix sysfs_chmod_file() such that it updates sd->s_mode too

[Greg Kroah-Hartman]

From: Tejun Heo <htejun@xxxxxxxxx>

sysfs_chmod_file() looked and updated only inode of the target file.
Dentry and inode are reclaimable and the update mode data will go away
when the inode is reclaimed.  This patch makes sysfs_chmod_file()
update sd->s_mode too such that the change is permanent.

Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
Acked-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 fs/sysfs/file.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index ff93c92..9fdf8da 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -521,10 +521,19 @@ int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
 	}
 
 	inode = victim->d_inode;
+
 	mutex_lock(&inode->i_mutex);
+
 	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
 	rc = notify_change(victim, &newattrs);
+
+	if (rc == 0) {
+		mutex_lock(&sysfs_mutex);
+		victim_sd->s_mode = newattrs.ia_mode;
+		mutex_unlock(&sysfs_mutex);
+	}
+
 	mutex_unlock(&inode->i_mutex);
  out:
 	dput(victim);
-- 
1.5.3.4

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