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configfs: Convert subsystem semaphore to mutex

Browse source 
Convert the su_sem member of struct configfs_subsystem to a struct
mutex, as that's what it is. Also convert all the users and update
Documentation/configfs.txt and Documentation/configfs_example.c
accordingly.

[ Conflict in fs/dlm/config.c with commit
  3168b0780d manually resolved. --Mark ]

Inspired-by: Satyam Sharma <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
Signed-off-by: Mark Fasheh <[email protected]>
This commit is contained in:
Joel Becker 2007-07-06 23:33:17 -07:00 • committed by Mark Fasheh
commit e6bd07aee7
6 changed files with 26 additions and 26 deletions
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16
fs/configfs/dir.c
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@ -562,7 +562,7 @@ static int populate_groups(struct config_group *group)
/*
* All of link_obj/unlink_obj/link_group/unlink_group require that
* subsys->su_sem is held.
* subsys->su_mutex is held.
*/
static void unlink_obj(struct config_item *item)
@ -783,7 +783,7 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name);
down(&subsys->su_sem);
mutex_lock(&subsys->su_mutex);
group = NULL;
item = NULL;
if (type->ct_group_ops->make_group) {
@ -797,7 +797,7 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
if (item)
link_obj(parent_item, item);
}
up(&subsys->su_sem);
mutex_unlock(&subsys->su_mutex);
kfree(name);
if (!item) {
@ -841,13 +841,13 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
out_unlink:
if (ret) {
/* Tear down everything we built up */
down(&subsys->su_sem);
mutex_lock(&subsys->su_mutex);
if (group)
unlink_group(group);
else
unlink_obj(item);
client_drop_item(parent_item, item);
up(&subsys->su_sem);
mutex_unlock(&subsys->su_mutex);
if (module_got)
module_put(owner);
@ -910,17 +910,17 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
if (sd->s_type & CONFIGFS_USET_DIR) {
configfs_detach_group(item);
down(&subsys->su_sem);
mutex_lock(&subsys->su_mutex);
unlink_group(to_config_group(item));
} else {
configfs_detach_item(item);
down(&subsys->su_sem);
mutex_lock(&subsys->su_mutex);
unlink_obj(item);
}
client_drop_item(parent_item, item);
up(&subsys->su_sem);
mutex_unlock(&subsys->su_mutex);
/* Drop our reference from above */
config_item_put(item);