From: Theodore Ts'o Subject: [PATCH 31/42] ext4: fix initialization of UNINIT bitmap blocks Date: Thu, 9 Oct 2008 00:05:49 -0400 Message-ID: <1223525160-9887-32-git-send-email-tytso@mit.edu> References: <1223525160-9887-1-git-send-email-tytso@mit.edu> <1223525160-9887-2-git-send-email-tytso@mit.edu> <1223525160-9887-3-git-send-email-tytso@mit.edu> <1223525160-9887-4-git-send-email-tytso@mit.edu> <1223525160-9887-5-git-send-email-tytso@mit.edu> <1223525160-9887-6-git-send-email-tytso@mit.edu> <1223525160-9887-7-git-send-email-tytso@mit.edu> <1223525160-9887-8-git-send-email-tytso@mit.edu> <1223525160-9887-9-git-send-email-tytso@mit.edu> <1223525160-9887-10-git-send-email-tytso@mit.edu> <1223525160-9887-11-git-send-email-tytso@mit.edu> <1223525160-9887-12-git-send-email-tytso@mit.edu> <1223525160-9887-13-git-send-email-tytso@mit.edu> <1223525160-9887-14-git-send-email-tytso@mit.edu> <1223525160-9887-15-git-send-email-tytso@mit.edu> <1223525160-9887-16-git-send-email-tytso@mit.edu> <1223525160-9887-17-git-send-email-tytso@mit.edu> <1223525160-9887-18-git-send-email-tytso@mit.edu> <1223525160-9887-19-git-send-email-tytso@mit.edu> <1223525160-9887-20-git-send-email-tytso@mit.edu> <1223525160-9887-21-git-send-email-tytso@mit.edu> <1223525160-9887-22-git-send-email-tytso@mit.edu> <1223525160-9887-23-git-send-email-tytso@mit.edu> <1223525160-9887-24-git-send-email-tytso@mit.edu> <1223525160-9887-25-git-send-email-tytso@mit.edu> <1223525160-9887-26-git-send-email-tytso@mit.edu> <1223525160-9887-27-git-send-email-tytso@mit.edu> <1223525160-9887-28-git-send-email-tytso@mit.edu> <1223525160-9887-29-git-send-email-tytso@mit.edu> <1223525160-9887-30-git-send-email-tytso@mit.edu> <1223525160-9887-31-git-send-email-tytso@mit.edu> Cc: Frederic Bohe , "Theodore Ts'o" To: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from www.church-of-our-saviour.org ([69.25.196.31]:44270 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757923AbYJIEaS (ORCPT ); Thu, 9 Oct 2008 00:30:18 -0400 In-Reply-To: <1223525160-9887-31-git-send-email-tytso@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: From: Frederic Bohe We must always initialize uninitialized bitmap blocks even if the buffer head is marked uptodate, since it could have been read in by a userspace program. So always initialized the bitmap block if it is marked uninitialzied and not dirty; it will marked initialized as soon as we allocate a block or inode out of that bitmap. Signed-off-by: Frederic Bohe Signed-off-by: "Theodore Ts'o" --- fs/ext4/balloc.c | 4 +++- fs/ext4/ialloc.c | 4 +++- fs/ext4/mballoc.c | 4 +++- 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 59566c0..bd2ece2 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -319,9 +319,11 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) block_group, bitmap_blk); return NULL; } - if (bh_uptodate_or_lock(bh)) + if (buffer_uptodate(bh) && + !(desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) return bh; + lock_buffer(bh); spin_lock(sb_bgl_lock(EXT4_SB(sb), block_group)); if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { ext4_init_block_bitmap(sb, bh, block_group, desc); diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 1343bf1..fe34d74 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -115,9 +115,11 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) block_group, bitmap_blk); return NULL; } - if (bh_uptodate_or_lock(bh)) + if (buffer_uptodate(bh) && + !(desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) return bh; + lock_buffer(bh); spin_lock(sb_bgl_lock(EXT4_SB(sb), block_group)); if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { ext4_init_inode_bitmap(sb, bh, block_group, desc); diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index c84b68f..28bf8ef 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -782,9 +782,11 @@ static int ext4_mb_init_cache(struct page *page, char *incore) if (bh[i] == NULL) goto out; - if (bh_uptodate_or_lock(bh[i])) + if (buffer_uptodate(bh[i]) && + !(desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) continue; + lock_buffer(bh[i]); spin_lock(sb_bgl_lock(EXT4_SB(sb), first_group + i)); if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { ext4_init_block_bitmap(sb, bh[i], -- 1.5.6.1.205.ge2c7.dirty