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sysfs: move sysfs_dirent->s_children into sysfs_dirent->s_dir

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Children list head is only meaninful for directory nodes.  Move it
into s_dir.  This doesn't save any space currently but it will with
further changes.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo 2007-09-20 16:05:12 +09:00 committed by Greg Kroah-Hartman
parent dc2f75f0e0
commit bc747f37a0
3 changed files with 12 additions and 10 deletions
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17
fs/sysfs/dir.c
View file

@ -26,7 +26,7 @@ static DEFINE_IDA(sysfs_ino_ida);
* @sd: sysfs_dirent of interest
*
* Link @sd into its sibling list which starts from
* sd->s_parent->s_children.
* sd->s_parent->s_dir.children.
*
* Locking:
* mutex_lock(sysfs_mutex)
@ -40,9 +40,9 @@ static void sysfs_link_sibling(struct sysfs_dirent *sd)
/* Store directory entries in order by ino. This allows
* readdir to properly restart without having to add a
* cursor into the s_children list.
* cursor into the s_dir.children list.
*/
for (pos = &parent_sd->s_children; *pos; pos = &(*pos)->s_sibling) {
for (pos = &parent_sd->s_dir.children; *pos; pos = &(*pos)->s_sibling) {
if (sd->s_ino < (*pos)->s_ino)
break;
}
@ -55,7 +55,7 @@ static void sysfs_link_sibling(struct sysfs_dirent *sd)
* @sd: sysfs_dirent of interest
*
* Unlink @sd from its sibling list which starts from
* sd->s_parent->s_children.
* sd->s_parent->s_dir.children.
*
* Locking:
* mutex_lock(sysfs_mutex)
@ -64,7 +64,8 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
{
struct sysfs_dirent **pos;
for (pos = &sd->s_parent->s_children; *pos; pos = &(*pos)->s_sibling) {
for (pos = &sd->s_parent->s_dir.children; *pos;
pos = &(*pos)->s_sibling) {
if (*pos == sd) {
*pos = sd->s_sibling;
sd->s_sibling = NULL;
@ -570,7 +571,7 @@ struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
{
struct sysfs_dirent *sd;
for (sd = parent_sd->s_children; sd; sd = sd->s_sibling)
for (sd = parent_sd->s_dir.children; sd; sd = sd->s_sibling)
if (!strcmp(sd->s_name, name))
return sd;
return NULL;
@ -722,7 +723,7 @@ static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
sysfs_addrm_start(&acxt, dir_sd);
pos = &dir_sd->s_children;
pos = &dir_sd->s_dir.children;
while (*pos) {
struct sysfs_dirent *sd = *pos;
@ -922,7 +923,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
mutex_lock(&sysfs_mutex);
/* Skip the dentries we have already reported */
pos = parent_sd->s_children;
pos = parent_sd->s_dir.children;
while (pos && (filp->f_pos > pos->s_ino))
pos = pos->s_sibling;

2
fs/sysfs/inode.c
View file

@ -127,7 +127,7 @@ static int sysfs_count_nlink(struct sysfs_dirent *sd)
struct sysfs_dirent *child;
int nr = 0;
for (child = sd->s_children; child; child = child->s_sibling)
for (child = sd->s_dir.children; child; child = child->s_sibling)
if (sysfs_type(child) == SYSFS_DIR)
nr++;

3
fs/sysfs/sysfs.h
View file

@ -1,6 +1,8 @@
/* type-specific structures for sysfs_dirent->s_* union members */
struct sysfs_elem_dir {
struct kobject *kobj;
/* children list starts here and goes through sd->s_sibling */
struct sysfs_dirent *children;
};
struct sysfs_elem_symlink {
@ -28,7 +30,6 @@ struct sysfs_dirent {
atomic_t s_active;
struct sysfs_dirent *s_parent;
struct sysfs_dirent *s_sibling;
struct sysfs_dirent *s_children;
const char *s_name;
union {