From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762745AbdEVWxQ (ORCPT ); Mon, 22 May 2017 18:53:16 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:56028 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762712AbdEVWxM (ORCPT ); Mon, 22 May 2017 18:53:12 -0400 Smtp-Origin-Hostprefix: devbig From: Shaohua Li Smtp-Origin-Hostname: devbig638.prn2.facebook.com To: CC: , , , Smtp-Origin-Cluster: prn2c22 Subject: [PATCH 2/5] kernfs: use idr instead of ida to manage inode number Date: Mon, 22 May 2017 15:53:06 -0700 Message-ID: <4cd240bd00310abcf241ce0d7ac92babbcd9da21.1495490800.git.shli@fb.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: References: X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-05-22_12:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Signed-off-by: Shaohua Li --- fs/kernfs/dir.c | 17 ++++++++++++----- include/linux/kernfs.h | 2 +- 2 files changed, 13 insertions(+), 6 deletions(-) diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 09d093e..8e8545a 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; @@ -876,14 +883,14 @@ 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); atomic_set(&root->next_generation, 0); 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 c5f0fa7..61668d1 100644 --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -164,7 +164,7 @@ 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 */ -- 2.9.3