diff options
| author | Shaohua Li <shli@fb.com> | 2017-07-12 11:49:46 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-07-29 09:00:03 -0600 |
| commit | 7d35079f8277b653d6a3075eea9edd4dbf7c2b29 (patch) | |
| tree | ba7fa95ee75d62694c4fa83e936709e9b4279954 /fs | |
| parent | 0a07b238e5f488b459b6113a62e06b6aab017f71 (diff) | |
| download | linux-0-day-7d35079f8277b653d6a3075eea9edd4dbf7c2b29.tar.gz linux-0-day-7d35079f8277b653d6a3075eea9edd4dbf7c2b29.tar.xz | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/kernfs/dir.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index db5900aaa55a4..8ad7a17895fec 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); } |