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authorShaohua Li <shli@fb.com>2017-07-12 11:49:46 -0700
committerJens Axboe <axboe@kernel.dk>2017-07-29 09:00:03 -0600
commit7d35079f8277b653d6a3075eea9edd4dbf7c2b29 (patch)
treeba7fa95ee75d62694c4fa83e936709e9b4279954
parent0a07b238e5f488b459b6113a62e06b6aab017f71 (diff)
kernfs: use idr instead of ida to manage inode number
kernfs uses ida to manage inode number. The problem is we can't get kernfs_node from inode number with ida. Switching to use idr, next patch will add an API to get kernfs_node from inode number. Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--fs/kernfs/dir.c17
-rw-r--r--include/linux/kernfs.h2
2 files changed, 13 insertions, 6 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index db5900aaa55a..8ad7a17895fe 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -21,6 +21,7 @@
DEFINE_MUTEX(kernfs_mutex);
static DEFINE_SPINLOCK(kernfs_rename_lock); /* kn->parent and ->name */
static char kernfs_pr_cont_buf[PATH_MAX]; /* protected by rename_lock */
+static DEFINE_SPINLOCK(kernfs_idr_lock); /* root->ino_idr */
#define rb_to_kn(X) rb_entry((X), struct kernfs_node, rb)
@@ -533,7 +534,9 @@ void kernfs_put(struct kernfs_node *kn)
simple_xattrs_free(&kn->iattr->xattrs);
}
kfree(kn->iattr);
- ida_simple_remove(&root->ino_ida, kn->ino);
+ spin_lock(&kernfs_idr_lock);
+ idr_remove(&root->ino_idr, kn->ino);
+ spin_unlock(&kernfs_idr_lock);
kmem_cache_free(kernfs_node_cache, kn);
kn = parent;
@@ -542,7 +545,7 @@ void kernfs_put(struct kernfs_node *kn)
goto repeat;
} else {
/* just released the root kn, free @root too */
- ida_destroy(&root->ino_ida);
+ idr_destroy(&root->ino_idr);
kfree(root);
}
}
@@ -630,7 +633,11 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
if (!kn)
goto err_out1;
- ret = ida_simple_get(&root->ino_ida, 1, 0, GFP_KERNEL);
+ idr_preload(GFP_KERNEL);
+ spin_lock(&kernfs_idr_lock);
+ ret = idr_alloc(&root->ino_idr, kn, 1, 0, GFP_ATOMIC);
+ spin_unlock(&kernfs_idr_lock);
+ idr_preload_end();
if (ret < 0)
goto err_out2;
kn->ino = ret;
@@ -875,13 +882,13 @@ struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops,
if (!root)
return ERR_PTR(-ENOMEM);
- ida_init(&root->ino_ida);
+ idr_init(&root->ino_idr);
INIT_LIST_HEAD(&root->supers);
kn = __kernfs_new_node(root, "", S_IFDIR | S_IRUGO | S_IXUGO,
KERNFS_DIR);
if (!kn) {
- ida_destroy(&root->ino_ida);
+ idr_destroy(&root->ino_idr);
kfree(root);
return ERR_PTR(-ENOMEM);
}
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index a9b11b8d06f2..5f5d602eb433 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -163,7 +163,7 @@ struct kernfs_root {
unsigned int flags; /* KERNFS_ROOT_* flags */
/* private fields, do not use outside kernfs proper */
- struct ida ino_ida;
+ struct idr ino_idr;
struct kernfs_syscall_ops *syscall_ops;
/* list of kernfs_super_info of this root, protected by kernfs_mutex */