This patch rewrites sysfs_rename_dir to perform it's checks
as much as possible on the underlying sysfs_dirents instead
of the contents of the dcache. It turns out that this version
is a little simpler, and a little more like the rest of
the sysfs directory modification code.
Signed-off-by: Eric W. Biederman <[EMAIL PROTECTED]>
---
fs/sysfs/dir.c | 36 ++++++++++++++++--------------------
1 files changed, 16 insertions(+), 20 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 1d53c2a..3228f5a 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -855,7 +855,7 @@ struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
{
- struct sysfs_dirent *sd;
+ struct sysfs_dirent *sd = kobj->sd;
struct dentry *parent = NULL;
struct dentry *old_dentry = NULL, *new_dentry = NULL;
const char *dup_name = NULL;
@@ -863,42 +863,41 @@ int sysfs_rename_dir(struct kobject * kobj, const char
*new_name)
mutex_lock(&sysfs_rename_mutex);
+ error = 0;
+ if (strcmp(sd->s_name, new_name) == 0)
+ goto out; /* nothing to rename */
+
/* get the original dentry */
- sd = kobj->sd;
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
error = PTR_ERR(old_dentry);
- goto out_dput;
+ goto out;
}
parent = old_dentry->d_parent;
/* lock parent and get dentry for new name */
mutex_lock(&parent->d_inode->i_mutex);
+ mutex_lock(&sysfs_mutex);
- new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
- if (IS_ERR(new_dentry)) {
- error = PTR_ERR(new_dentry);
- goto out_unlock;
- }
-
- error = -EINVAL;
- if (old_dentry == new_dentry)
+ error = -EEXIST;
+ if (sysfs_find_dirent(sd->s_parent, new_name))
goto out_unlock;
- error = -EEXIST;
- if (new_dentry->d_inode)
+ error = -ENOMEM;
+ new_dentry = d_alloc_name(parent, new_name);
+ if (!new_dentry)
goto out_unlock;
/* rename kobject and sysfs_dirent */
error = -ENOMEM;
new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
if (!new_name)
- goto out_drop;
+ goto out_unlock;
error = kobject_set_name(kobj, "%s", new_name);
if (error)
- goto out_drop;
+ goto out_unlock;
mutex_lock(&sysfs_mutex);
dup_name = sd->s_name;
@@ -910,16 +909,13 @@ int sysfs_rename_dir(struct kobject * kobj, const char
*new_name)
d_move(old_dentry, new_dentry);
error = 0;
- goto out_unlock;
-
- out_drop:
- d_drop(new_dentry);
out_unlock:
+ mutex_unlock(&sysfs_mutex);
mutex_unlock(&parent->d_inode->i_mutex);
- out_dput:
kfree(dup_name);
dput(old_dentry);
dput(new_dentry);
+ out:
mutex_unlock(&sysfs_rename_mutex);
return error;
}
--
1.5.1.1.181.g2de0
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