Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753759Ab0BWTvl (ORCPT ); Tue, 23 Feb 2010 14:51:41 -0500 Received: from mga14.intel.com ([143.182.124.37]:28158 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752656Ab0BWTvj (ORCPT ); Tue, 23 Feb 2010 14:51:39 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.49,527,1262592000"; d="scan'208";a="247253336" Subject: Re: [PATCH] btrfs: use RB_ROOT to intialize rb_trees instead of setting rb_node to NULL From: "Pallipadi, Venkatesh" To: Eric Paris Cc: "linux-btrfs@vger.kernel.org" , "chris.mason@oracle.com" , "mingo@elte.hu" , "hpa@zytor.com" , "tglx@linutronix.de" , "wstrepp@gmx.de" , "Siddha, Suresh B" , "linux-kernel@vger.kernel.org" In-Reply-To: <20100223194304.7963.98121.stgit@paris.rdu.redhat.com> References: <20100223194304.7963.98121.stgit@paris.rdu.redhat.com> Content-Type: text/plain Date: Tue, 23 Feb 2010 11:51:37 -0800 Message-Id: <1266954697.16916.904.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.24.3 (2.24.3-1.fc10) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8666 Lines: 211 Acked-by: Venkatesh Pallipadi Quick grep also shows similar initializations in jffs2, ext4 and ext3. Let me know if you already have patch for them, otherwise I can send in the fix for those. Thanks, Venki On Tue, 2010-02-23 at 11:43 -0800, Eric Paris wrote: > btrfs inialize rb trees in quite a number of places by settin rb_node = > NULL; The problem with this is that 17d9ddc72fb8bba0d4f678 in the > linux-next tree adds a new field to that struct which needs to be NULL for > the new rbtree library code to work properly. This patch uses RB_ROOT as > the intializer so all of the relevant fields will be NULL'd. Without the > patch I get a panic like that shown below and after the patch my system > boots. > > [ 5.314627] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 5.315518] last sysfs file: /sys/kernel/uevent_seqnum > [ 5.315518] CPU 0 > [ 5.315518] Modules linked in: [last unloaded: scsi_wait_scan] > [ 5.315518] > [ 5.315518] Pid: 1314, comm: mount Not tainted 2.6.33-rc8-next-20100223+ #21 /KVM > [ 5.315518] RIP: 0010:[] [] rb_insert_color+0x20/0x120 > [ 5.315518] RSP: 0018:ffff88003cc21a88 EFLAGS: 00010206 > [ 5.315518] RAX: 5a5a5a5a5a5a5a5a RBX: ffffea0000d5e5b8 RCX: 0000000000000000 > [ 5.315518] RDX: ffff88003d710080 RSI: ffff88003d710080 RDI: ffff88003d610058 > [ 5.315518] RBP: ffff88003cc21ab8 R08: 0000000000000002 R09: 0000000000000000 > [ 5.315518] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88003d710070 > [ 5.315518] R13: 0000000000000010 R14: ffff88003d610058 R15: ffff88003d710080 > [ 5.315518] FS: 00007ffe37b197e0(0000) GS:ffff880004000000(0000) knlGS:0000000000000000 > [ 5.315518] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 5.315518] CR2: 00007ffe36d7d010 CR3: 000000003cd94000 CR4: 00000000000006f0 > [ 5.315518] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 5.315518] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ 5.315518] Process mount (pid: 1314, threadinfo ffff88003cc20000, task ffff88003d100000) > [ 5.315518] Stack: > [ 5.315518] ffff88003cc21ab8 ffffea0000d5e5b8 ffff88003d710070 0000000000000010 > [ 5.315518] <0> ffff88003d7100e0 0000000000010000 ffff88003cc21b48 ffffffff812058b4 > [ 5.315518] <0> ffff88003cc2e060 ffff88003cc20000 0000000000000010 000000503cc2dff0 > [ 5.315518] Call Trace: > [ 5.315518] [] alloc_extent_buffer+0x294/0x410 > [ 5.315518] [] btrfs_find_create_tree_block+0x28/0x30 > [ 5.315518] [] btrfs_read_sys_array+0x31/0x150 > [ 5.315518] [] open_ctree+0x109a/0x1710 > [ 5.315518] [] ? sget+0x365/0x480 > [ 5.315518] [] ? strlcpy+0x4f/0x70 > [ 5.315518] [] btrfs_get_sb+0x41c/0x510 > [ 5.315518] [] ? alloc_vfsmnt+0xc6/0x1a0 > [ 5.315518] [] vfs_kern_mount+0x89/0x1a0 > [ 5.315518] [] do_kern_mount+0x4e/0x110 > [ 5.315518] [] do_mount+0x547/0x800 > [ 5.315518] [] ? strndup_user+0x80/0xb0 > [ 5.315518] [] sys_mount+0x8a/0xd0 > [ 5.315518] [] system_call_fastpath+0x16/0x1b > > Signed-off-by: Eric Paris > --- > > fs/btrfs/disk-io.c | 4 ++-- > fs/btrfs/extent_io.c | 4 ++-- > fs/btrfs/extent_map.c | 2 +- > fs/btrfs/free-space-cache.c | 4 ++-- > fs/btrfs/ordered-data.h | 2 +- > fs/btrfs/ref-cache.h | 2 +- > fs/btrfs/relocation.c | 4 ++-- > fs/btrfs/transaction.c | 2 +- > 8 files changed, 12 insertions(+), 12 deletions(-) > > diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c > index 2b59201..0427183 100644 > --- a/fs/btrfs/disk-io.c > +++ b/fs/btrfs/disk-io.c > @@ -901,7 +901,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, > root->highest_objectid = 0; > root->name = NULL; > root->in_sysfs = 0; > - root->inode_tree.rb_node = NULL; > + root->inode_tree = RB_ROOT; > > INIT_LIST_HEAD(&root->dirty_list); > INIT_LIST_HEAD(&root->orphan_list); > @@ -1673,7 +1673,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, > insert_inode_hash(fs_info->btree_inode); > > spin_lock_init(&fs_info->block_group_cache_lock); > - fs_info->block_group_cache_tree.rb_node = NULL; > + fs_info->block_group_cache_tree = RB_ROOT; > > extent_io_tree_init(&fs_info->freed_extents[0], > fs_info->btree_inode->i_mapping, GFP_NOFS); > diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c > index b177ed3..7073cbb 100644 > --- a/fs/btrfs/extent_io.c > +++ b/fs/btrfs/extent_io.c > @@ -104,8 +104,8 @@ void extent_io_exit(void) > void extent_io_tree_init(struct extent_io_tree *tree, > struct address_space *mapping, gfp_t mask) > { > - tree->state.rb_node = NULL; > - tree->buffer.rb_node = NULL; > + tree->state = RB_ROOT; > + tree->buffer = RB_ROOT; > tree->ops = NULL; > tree->dirty_bytes = 0; > spin_lock_init(&tree->lock); > diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c > index 428fcac..28d87ba 100644 > --- a/fs/btrfs/extent_map.c > +++ b/fs/btrfs/extent_map.c > @@ -35,7 +35,7 @@ void extent_map_exit(void) > */ > void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask) > { > - tree->map.rb_node = NULL; > + tree->map = RB_ROOT; > rwlock_init(&tree->lock); > } > > diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c > index cb2849f..dd831ed 100644 > --- a/fs/btrfs/free-space-cache.c > +++ b/fs/btrfs/free-space-cache.c > @@ -870,7 +870,7 @@ __btrfs_return_cluster_to_free_space( > tree_insert_offset(&block_group->free_space_offset, > entry->offset, &entry->offset_index, 0); > } > - cluster->root.rb_node = NULL; > + cluster->root = RB_ROOT; > > out: > spin_unlock(&cluster->lock); > @@ -1355,7 +1355,7 @@ void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) > { > spin_lock_init(&cluster->lock); > spin_lock_init(&cluster->refill_lock); > - cluster->root.rb_node = NULL; > + cluster->root = RB_ROOT; > cluster->max_size = 0; > cluster->points_to_bitmap = false; > INIT_LIST_HEAD(&cluster->block_group_list); > diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h > index 1fe1282..9116c6d 100644 > --- a/fs/btrfs/ordered-data.h > +++ b/fs/btrfs/ordered-data.h > @@ -129,7 +129,7 @@ static inline void > btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) > { > mutex_init(&t->mutex); > - t->tree.rb_node = NULL; > + t->tree = RB_ROOT; > t->last = NULL; > } > > diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h > index bc283ad..e2a55cb 100644 > --- a/fs/btrfs/ref-cache.h > +++ b/fs/btrfs/ref-cache.h > @@ -52,7 +52,7 @@ static inline size_t btrfs_leaf_ref_size(int nr_extents) > > static inline void btrfs_leaf_ref_tree_init(struct btrfs_leaf_ref_tree *tree) > { > - tree->root.rb_node = NULL; > + tree->root = RB_ROOT; > INIT_LIST_HEAD(&tree->list); > spin_lock_init(&tree->lock); > } > diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c > index ab7ab53..0109e56 100644 > --- a/fs/btrfs/relocation.c > +++ b/fs/btrfs/relocation.c > @@ -170,14 +170,14 @@ struct async_merge { > > static void mapping_tree_init(struct mapping_tree *tree) > { > - tree->rb_root.rb_node = NULL; > + tree->rb_root = RB_ROOT; > spin_lock_init(&tree->lock); > } > > static void backref_cache_init(struct backref_cache *cache) > { > int i; > - cache->rb_root.rb_node = NULL; > + cache->rb_root = RB_ROOT; > for (i = 0; i < BTRFS_MAX_LEVEL; i++) > INIT_LIST_HEAD(&cache->pending[i]); > spin_lock_init(&cache->lock); > diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c > index b2acc79..2a36e23 100644 > --- a/fs/btrfs/transaction.c > +++ b/fs/btrfs/transaction.c > @@ -69,7 +69,7 @@ static noinline int join_transaction(struct btrfs_root *root) > cur_trans->commit_done = 0; > cur_trans->start_time = get_seconds(); > > - cur_trans->delayed_refs.root.rb_node = NULL; > + cur_trans->delayed_refs.root = RB_ROOT; > cur_trans->delayed_refs.num_entries = 0; > cur_trans->delayed_refs.num_heads_ready = 0; > cur_trans->delayed_refs.num_heads = 0; > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/