lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sysfs: add sysfs_dirent->s_name

Browse Source 
Add s_name to sysfs_dirent.  This is to further reduce dependency to
the associated dentry.  Name is copied for directories and symlinks
but not for attributes.

Where possible, name dereferences are converted to use sd->s_name.
sysfs_symlink->link_name and sysfs_get_name() are unused now and
removed.

This change allows symlink to be implemented using sysfs_dirent tree
proper, which is the last remaining dentry-dependent sysfs walk.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo
2007-06-14 03:45:15 +09:00
committed by Greg Kroah-Hartman
parent 13b3086d2e
commit 0c096b507f
6 changed files with 52 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files

69
fs/sysfs/dir.c
View File

@@ -54,10 +54,11 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
if (sd->s_type & SYSFS_KOBJ_LINK) {
struct sysfs_symlink * sl = sd->s_element;
kfree(sl->link_name);
kobject_put(sl->target_kobj);
kfree(sl);
}
if (sd->s_type & SYSFS_COPY_NAME)
kfree(sd->s_name);
kfree(sd->s_iattr);
sysfs_free_ino(sd->s_ino);
kmem_cache_free(sysfs_dir_cachep, sd);
@@ -94,29 +95,41 @@ static struct dentry_operations sysfs_dentry_ops = {
.d_iput = sysfs_d_iput,
};
struct sysfs_dirent *sysfs_new_dirent(void *element, umode_t mode, int type)
struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element,
umode_t mode, int type)
{
struct sysfs_dirent * sd;
char *dup_name = NULL;
struct sysfs_dirent *sd = NULL;
if (type & SYSFS_COPY_NAME) {
name = dup_name = kstrdup(name, GFP_KERNEL);
if (!name)
goto err_out;
}
sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL);
if (!sd)
return NULL;
goto err_out;
if (sysfs_alloc_ino(&sd->s_ino)) {
kmem_cache_free(sysfs_dir_cachep, sd);
return NULL;
}
if (sysfs_alloc_ino(&sd->s_ino))
goto err_out;
atomic_set(&sd->s_count, 1);
atomic_set(&sd->s_event, 1);
INIT_LIST_HEAD(&sd->s_children);
INIT_LIST_HEAD(&sd->s_sibling);
sd->s_name = name;
sd->s_element = element;
sd->s_mode = mode;
sd->s_type = type;
return sd;
err_out:
kfree(dup_name);
kmem_cache_free(sysfs_dir_cachep, sd);
return NULL;
}
void sysfs_attach_dirent(struct sysfs_dirent *sd,
@@ -148,8 +161,7 @@ int sysfs_dirent_exist(struct sysfs_dirent *parent_sd,
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (sd->s_element) {
const unsigned char *existing = sysfs_get_name(sd);
if (strcmp(existing, new))
if (strcmp(sd->s_name, new))
continue;
else
return -EEXIST;
@@ -203,7 +215,7 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
goto out_dput;
error = -ENOMEM;
sd = sysfs_new_dirent(kobj, mode, SYSFS_DIR);
sd = sysfs_new_dirent(name, kobj, mode, SYSFS_DIR);
if (!sd)
goto out_drop;
sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
@@ -334,9 +346,7 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (sd->s_type & SYSFS_NOT_PINNED) {
const unsigned char * name = sysfs_get_name(sd);
if (strcmp(name, dentry->d_name.name))
if (strcmp(sd->s_name, dentry->d_name.name))
continue;
if (sd->s_type & SYSFS_KOBJ_LINK)
@@ -427,9 +437,11 @@ void sysfs_remove_dir(struct kobject * kobj)
int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
const char *new_name)
{
struct sysfs_dirent *sd = kobj->dentry->d_fsdata;
struct sysfs_dirent *parent_sd = new_parent->d_fsdata;
struct dentry *new_dentry;
char *dup_name;
int error;
struct dentry * new_dentry;
struct sysfs_dirent *sd, *parent_sd;
if (!new_parent)
return -EFAULT;
@@ -457,22 +469,31 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
if (new_dentry->d_inode)
goto out_dput;
error = kobject_set_name(kobj, "%s", new_name);
if (error)
/* rename kobject and sysfs_dirent */
error = -ENOMEM;
new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
if (!new_name)
goto out_drop;
error = kobject_set_name(kobj, "%s", new_name);
if (error)
goto out_free;
kfree(sd->s_name);
sd->s_name = new_name;
/* move under the new parent */
d_add(new_dentry, NULL);
d_move(kobj->dentry, new_dentry);
sd = kobj->dentry->d_fsdata;
parent_sd = new_parent->d_fsdata;
list_del_init(&sd->s_sibling);
list_add(&sd->s_sibling, &parent_sd->s_children);
error = 0;
goto out_unlock;
out_free:
kfree(dup_name);
out_drop:
d_drop(new_dentry);
out_dput:
@@ -535,7 +556,7 @@ static int sysfs_dir_open(struct inode *inode, struct file *file)
struct sysfs_dirent * sd;
mutex_lock(&dentry->d_inode->i_mutex);
sd = sysfs_new_dirent(NULL, 0, 0);
sd = sysfs_new_dirent("_DIR_", NULL, 0, 0);
if (sd)
sysfs_attach_dirent(sd, parent_sd, NULL);
mutex_unlock(&dentry->d_inode->i_mutex);
@@ -605,7 +626,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
if (!next->s_element)
continue;
name = sysfs_get_name(next);
name = next->s_name;
len = strlen(name);
ino = next->s_ino;
@@ -717,7 +738,7 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
if (!shadow)
goto nomem;
sd = sysfs_new_dirent(kobj, inode->i_mode, SYSFS_DIR);
sd = sysfs_new_dirent("_SHADOW_", kobj, inode->i_mode, SYSFS_DIR);
if (!sd)
goto nomem;
/* point to parent_sd but don't attach to it */