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| author | Eric W. Biederman <ebiederm@xmission.com> | 2009-11-20 16:08:54 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-11 11:24:54 -0800 |
| commit | 06fc0d66f7ed3a3b08e8fcf8c325ecf0b8f93fea (patch) | |
| tree | a599fc1cabf3564745ac03bc3e70c7211dc8081e | |
| parent | e61ab4ae48fbf477f5b9fcbec9e1b8dc789920d0 (diff) | |
| download | linux-3.10-06fc0d66f7ed3a3b08e8fcf8c325ecf0b8f93fea.tar.gz linux-3.10-06fc0d66f7ed3a3b08e8fcf8c325ecf0b8f93fea.tar.bz2 linux-3.10-06fc0d66f7ed3a3b08e8fcf8c325ecf0b8f93fea.zip | |
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>
| -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 faa1a803caa..dc30d9e3168 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); |