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authorTejun Heo2013-11-28 14:54:41 -0500
committerGreg Kroah-Hartman2013-11-29 18:10:48 -0800
commitbc755553df9ab33f389c1a0a8bd0b4f4646e80ef (patch)
treea77c1a97948ebaa6f9a31e9b580ccc0fb254bead /fs/kernfs/dir.c
parentba7443bc656e5236c316b2acacc8b551f872910f (diff)
sysfs, kernfs: make inode number ida per kernfs_root
kernfs is being updated to allow multiple sysfs_dirent hierarchies so that it can also be used by other users. Currently, inode number is allocated using a global ida, sysfs_ino_ida; however, inos for different hierarchies should be handled separately. This patch makes ino allocation per kernfs_root. sysfs_ino_ida is replaced by kernfs_root->ino_ida and sysfs_new_dirent() is updated to take @root and allocate ino from it. ida_simple_get/remove() are used instead of sysfs_ino_lock and sysfs_alloc/free_ino(). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs/dir.c')
-rw-r--r--fs/kernfs/dir.c47
1 files changed, 13 insertions, 34 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 246740a741ef..eaffa83719d5 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -21,9 +21,6 @@ DEFINE_MUTEX(sysfs_mutex);
#define to_sysfs_dirent(X) rb_entry((X), struct sysfs_dirent, s_rb)
-static DEFINE_SPINLOCK(sysfs_ino_lock);
-static DEFINE_IDA(sysfs_ino_ida);
-
/**
* sysfs_name_hash
* @name: Null terminated string to hash
@@ -205,32 +202,6 @@ static void sysfs_deactivate(struct sysfs_dirent *sd)
rwsem_release(&sd->dep_map, 1, _RET_IP_);
}
-static int sysfs_alloc_ino(unsigned int *pino)
-{
- int ino, rc;
-
- retry:
- spin_lock(&sysfs_ino_lock);
- rc = ida_get_new_above(&sysfs_ino_ida, 1, &ino);
- spin_unlock(&sysfs_ino_lock);
-
- if (rc == -EAGAIN) {
- if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL))
- goto retry;
- rc = -ENOMEM;
- }
-
- *pino = ino;
- return rc;
-}
-
-static void sysfs_free_ino(unsigned int ino)
-{
- spin_lock(&sysfs_ino_lock);
- ida_remove(&sysfs_ino_ida, ino);
- spin_unlock(&sysfs_ino_lock);
-}
-
/**
* kernfs_get - get a reference count on a sysfs_dirent
* @sd: the target sysfs_dirent
@@ -276,7 +247,7 @@ void kernfs_put(struct sysfs_dirent *sd)
security_release_secctx(sd->s_iattr->ia_secdata,
sd->s_iattr->ia_secdata_len);
kfree(sd->s_iattr);
- sysfs_free_ino(sd->s_ino);
+ ida_simple_remove(&root->ino_ida, sd->s_ino);
kmem_cache_free(sysfs_dir_cachep, sd);
sd = parent_sd;
@@ -285,6 +256,7 @@ void kernfs_put(struct sysfs_dirent *sd)
goto repeat;
} else {
/* just released the root sd, free @root too */
+ ida_destroy(&root->ino_ida);
kfree(root);
}
}
@@ -360,10 +332,12 @@ const struct dentry_operations sysfs_dentry_ops = {
.d_release = sysfs_dentry_release,
};
-struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
+struct sysfs_dirent *sysfs_new_dirent(struct kernfs_root *root,
+ const char *name, umode_t mode, int type)
{
char *dup_name = NULL;
struct sysfs_dirent *sd;
+ int ret;
if (type & SYSFS_COPY_NAME) {
name = dup_name = kstrdup(name, GFP_KERNEL);
@@ -375,8 +349,10 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
if (!sd)
goto err_out1;
- if (sysfs_alloc_ino(&sd->s_ino))
+ ret = ida_simple_get(&root->ino_ida, 1, 0, GFP_KERNEL);
+ if (ret < 0)
goto err_out2;
+ sd->s_ino = ret;
atomic_set(&sd->s_count, 1);
atomic_set(&sd->s_active, 0);
@@ -628,8 +604,11 @@ struct kernfs_root *kernfs_create_root(void *priv)
if (!root)
return ERR_PTR(-ENOMEM);
- sd = sysfs_new_dirent("", S_IFDIR | S_IRUGO | S_IXUGO, SYSFS_DIR);
+ ida_init(&root->ino_ida);
+
+ sd = sysfs_new_dirent(root, "", S_IFDIR | S_IRUGO | S_IXUGO, SYSFS_DIR);
if (!sd) {
+ ida_destroy(&root->ino_ida);
kfree(root);
return ERR_PTR(-ENOMEM);
}
@@ -674,7 +653,7 @@ struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent,
int rc;
/* allocate */
- sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
+ sd = sysfs_new_dirent(kernfs_root(parent), name, mode, SYSFS_DIR);
if (!sd)
return ERR_PTR(-ENOMEM);