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Message-ID: <m1ir7rghbg.fsf_-_@ebiederm.dsl.xmission.com>
Date: Tue, 07 Aug 2007 15:34:11 -0600
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Greg KH <greg@...ah.com>
Cc: linux-kernel@...r.kernel.org, satyam@...radead.org,
cornelia.huck@...ibm.com, stern@...land.harvard.edu,
Tejun Heo <htejun@...il.com>,
Linux Containers <containers@...ts.osdl.org>, gregkh@...e.de
Subject: [PATCH 22/25] sysfs: sysfs_uptdate_file handle multiple superblocks
Teach sysfs_update_file how to handle multiple sysfs
superblocks. Again we are just iterating over the superblocks
to so all of the filesystem modification notifications work
as expected.
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
fs/sysfs/file.c | 35 +++++++++++++++++++++--------------
1 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index cff054f..1e6f9df 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -462,7 +462,8 @@ EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
{
struct sysfs_dirent *victim_sd = NULL;
- struct dentry *victim = NULL;
+ struct super_block *sb;
+ struct dentry *victim;
int rc;
rc = -ENOENT;
@@ -471,21 +472,27 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
goto out;
mutex_lock(&sysfs_rename_mutex);
- victim = sysfs_get_dentry(sysfs_sb, victim_sd);
- mutex_unlock(&sysfs_rename_mutex);
- if (IS_ERR(victim)) {
- rc = PTR_ERR(victim);
- victim = NULL;
- goto out;
+ sysfs_grab_supers();
+ list_for_each_entry(sb, &sysfs_fs_type.fs_supers, s_instances) {
+ victim = sysfs_get_dentry(sb, victim_sd);
+ if (!victim)
+ continue;
+ if (IS_ERR(victim)) {
+ rc = PTR_ERR(victim);
+ victim = NULL;
+ goto out_unlock;
+ }
+ mutex_lock(&victim->d_inode->i_mutex);
+ victim->d_inode->i_mtime = CURRENT_TIME;
+ fsnotify_modify(victim);
+ mutex_unlock(&victim->d_inode->i_mutex);
+ rc = 0;
+ dput(victim);
}
-
- mutex_lock(&victim->d_inode->i_mutex);
- victim->d_inode->i_mtime = CURRENT_TIME;
- fsnotify_modify(victim);
- mutex_unlock(&victim->d_inode->i_mutex);
- rc = 0;
+ out_unlock:
+ sysfs_release_supers();
+ mutex_unlock(&sysfs_rename_mutex);
out:
- dput(victim);
sysfs_put(victim_sd);
return rc;
}
--
1.5.1.1.181.g2de0
-
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