diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2009-11-20 16:08:54 -0800 |
---|---|---|
committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-12-09 10:16:07 +1100 |
commit | a7932514e1d5d3230f7de85ab9c77a658ea0eebe (patch) | |
tree | f19d72dc7dec2fc7046549c17f6a5c5d21f0a045 /fs/sysfs | |
parent | cc3b336a3a1116ce15552c124d94f850039d4aff (diff) |
sysfs: In sysfs_chmod_file lazily propagate the mode change.
Now that sysfs_getattr and sysfs_permission refresh the vfs
inode there is no need to immediatly push the mode change
into the vfs cache. Reducing the amount of work needed and
simplifying the locking.
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs')
-rw-r--r-- | fs/sysfs/file.c | 31 |
1 files changed, 8 insertions, 23 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index faa1a803caa9..dc30d9e31683 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -579,38 +579,23 @@ EXPORT_SYMBOL_GPL(sysfs_add_file_to_group); */ int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode) { - struct sysfs_dirent *victim_sd = NULL; - struct dentry *victim = NULL; - struct inode * inode; + struct sysfs_dirent *sd; struct iattr newattrs; int rc; - rc = -ENOENT; - victim_sd = sysfs_get_dirent(kobj->sd, attr->name); - if (!victim_sd) - goto out; + mutex_lock(&sysfs_mutex); - mutex_lock(&sysfs_rename_mutex); - victim = sysfs_get_dentry(victim_sd); - mutex_unlock(&sysfs_rename_mutex); - if (IS_ERR(victim)) { - rc = PTR_ERR(victim); - victim = NULL; + rc = -ENOENT; + sd = sysfs_find_dirent(kobj->sd, attr->name); + if (!sd) goto out; - } - - inode = victim->d_inode; - mutex_lock(&inode->i_mutex); - - newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); + newattrs.ia_mode = (mode & S_IALLUGO) | (sd->s_mode & ~S_IALLUGO); newattrs.ia_valid = ATTR_MODE; - rc = sysfs_setattr(victim, &newattrs); + rc = sysfs_sd_setattr(sd, &newattrs); - mutex_unlock(&inode->i_mutex); out: - dput(victim); - sysfs_put(victim_sd); + mutex_unlock(&sysfs_mutex); return rc; } EXPORT_SYMBOL_GPL(sysfs_chmod_file); |