From: Joel Becker Date: Thu, 13 Nov 2008 22:49:16 +0000 (-0800) Subject: ocfs2: Wrap extent block reads in a dedicated function. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5e96581a377fc6bd76e9b112da9aeb8a7ae8bf22;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git ocfs2: Wrap extent block reads in a dedicated function. We weren't consistently checking extent blocks after we read them. Most places checked the signature, but none checked h_blkno or h_fs_signature. Create a toplevel ocfs2_read_extent_block() that does the read and the validation. Signed-off-by: Joel Becker Signed-off-by: Mark Fasheh --- diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index 320545b9fe12..f430cc6e0f35 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -678,6 +678,66 @@ struct ocfs2_merge_ctxt { int c_split_covers_rec; }; +static int ocfs2_validate_extent_block(struct super_block *sb, + struct buffer_head *bh) +{ + struct ocfs2_extent_block *eb = + (struct ocfs2_extent_block *)bh->b_data; + + if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { + ocfs2_error(sb, + "Extent block #%llu has bad signature %.*s", + (unsigned long long)bh->b_blocknr, 7, + eb->h_signature); + return -EINVAL; + } + + if (le64_to_cpu(eb->h_blkno) != bh->b_blocknr) { + ocfs2_error(sb, + "Extent block #%llu has an invalid h_blkno " + "of %llu", + (unsigned long long)bh->b_blocknr, + (unsigned long long)le64_to_cpu(eb->h_blkno)); + return -EINVAL; + } + + if (le32_to_cpu(eb->h_fs_generation) != OCFS2_SB(sb)->fs_generation) { + ocfs2_error(sb, + "Extent block #%llu has an invalid " + "h_fs_generation of #%u", + (unsigned long long)bh->b_blocknr, + le32_to_cpu(eb->h_fs_generation)); + return -EINVAL; + } + + return 0; +} + +int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno, + struct buffer_head **bh) +{ + int rc; + struct buffer_head *tmp = *bh; + + rc = ocfs2_read_block(inode, eb_blkno, &tmp); + if (rc) + goto out; + + rc = ocfs2_validate_extent_block(inode->i_sb, tmp); + if (rc) { + brelse(tmp); + goto out; + } + + /* If ocfs2_read_block() got us a new bh, pass it up. */ + if (!*bh) + *bh = tmp; + +out: + return rc; +} + + /* * How many free extents have we got before we need more meta data? */ @@ -697,8 +757,7 @@ int ocfs2_num_free_extents(struct ocfs2_super *osb, last_eb_blk = ocfs2_et_get_last_eb_blk(et); if (last_eb_blk) { - retval = ocfs2_read_block(inode, last_eb_blk, - &eb_bh); + retval = ocfs2_read_extent_block(inode, last_eb_blk, &eb_bh); if (retval < 0) { mlog_errno(retval); goto bail; @@ -900,11 +959,8 @@ static int ocfs2_add_branch(struct ocfs2_super *osb, for(i = 0; i < new_blocks; i++) { bh = new_eb_bhs[i]; eb = (struct ocfs2_extent_block *) bh->b_data; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - status = -EIO; - goto bail; - } + /* ocfs2_create_new_meta_bhs() should create it right! */ + BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb)); eb_el = &eb->h_list; status = ocfs2_journal_access(handle, inode, bh, @@ -1044,11 +1100,8 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb, } eb = (struct ocfs2_extent_block *) new_eb_bh->b_data; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - status = -EIO; - goto bail; - } + /* ocfs2_create_new_meta_bhs() should create it right! */ + BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb)); eb_el = &eb->h_list; root_el = et->et_root_el; @@ -1168,18 +1221,13 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb, brelse(bh); bh = NULL; - status = ocfs2_read_block(inode, blkno, &bh); + status = ocfs2_read_extent_block(inode, blkno, &bh); if (status < 0) { mlog_errno(status); goto bail; } eb = (struct ocfs2_extent_block *) bh->b_data; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - status = -EIO; - goto bail; - } el = &eb->h_list; if (le16_to_cpu(el->l_next_free_rec) < @@ -1532,7 +1580,7 @@ static int __ocfs2_find_path(struct inode *inode, brelse(bh); bh = NULL; - ret = ocfs2_read_block(inode, blkno, &bh); + ret = ocfs2_read_extent_block(inode, blkno, &bh); if (ret) { mlog_errno(ret); goto out; @@ -1540,11 +1588,6 @@ static int __ocfs2_find_path(struct inode *inode, eb = (struct ocfs2_extent_block *) bh->b_data; el = &eb->h_list; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - ret = -EIO; - goto out; - } if (le16_to_cpu(el->l_next_free_rec) > le16_to_cpu(el->l_count)) { @@ -4089,8 +4132,15 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path, le16_to_cpu(new_el->l_count)) { bh = path_leaf_bh(left_path); eb = (struct ocfs2_extent_block *)bh->b_data; - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, - eb); + ocfs2_error(inode->i_sb, + "Extent block #%llu has an " + "invalid l_next_free_rec of " + "%d. It should have " + "matched the l_count of %d", + (unsigned long long)le64_to_cpu(eb->h_blkno), + le16_to_cpu(new_el->l_next_free_rec), + le16_to_cpu(new_el->l_count)); + status = -EINVAL; goto out; } rec = &new_el->l_recs[ @@ -4139,8 +4189,12 @@ ocfs2_figure_merge_contig_type(struct inode *inode, struct ocfs2_path *path, if (le16_to_cpu(new_el->l_next_free_rec) <= 1) { bh = path_leaf_bh(right_path); eb = (struct ocfs2_extent_block *)bh->b_data; - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, - eb); + ocfs2_error(inode->i_sb, + "Extent block #%llu has an " + "invalid l_next_free_rec of %d", + (unsigned long long)le64_to_cpu(eb->h_blkno), + le16_to_cpu(new_el->l_next_free_rec)); + status = -EINVAL; goto out; } rec = &new_el->l_recs[1]; @@ -4286,7 +4340,9 @@ static int ocfs2_figure_insert_type(struct inode *inode, * ocfs2_figure_insert_type() and ocfs2_add_branch() * may want it later. */ - ret = ocfs2_read_block(inode, ocfs2_et_get_last_eb_blk(et), &bh); + ret = ocfs2_read_extent_block(inode, + ocfs2_et_get_last_eb_blk(et), + &bh); if (ret) { mlog_exit(ret); goto out; @@ -4752,20 +4808,15 @@ static int __ocfs2_mark_extent_written(struct inode *inode, if (path->p_tree_depth) { struct ocfs2_extent_block *eb; - ret = ocfs2_read_block(inode, ocfs2_et_get_last_eb_blk(et), - &last_eb_bh); + ret = ocfs2_read_extent_block(inode, + ocfs2_et_get_last_eb_blk(et), + &last_eb_bh); if (ret) { mlog_exit(ret); goto out; } eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - ret = -EROFS; - goto out; - } - rightmost_el = &eb->h_list; } else rightmost_el = path_root_el(path); @@ -4910,8 +4961,9 @@ static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et, depth = path->p_tree_depth; if (depth > 0) { - ret = ocfs2_read_block(inode, ocfs2_et_get_last_eb_blk(et), - &last_eb_bh); + ret = ocfs2_read_extent_block(inode, + ocfs2_et_get_last_eb_blk(et), + &last_eb_bh); if (ret < 0) { mlog_errno(ret); goto out; @@ -6231,11 +6283,10 @@ static int ocfs2_find_new_last_ext_blk(struct inode *inode, eb = (struct ocfs2_extent_block *) bh->b_data; el = &eb->h_list; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - ret = -EROFS; - goto out; - } + + /* ocfs2_find_leaf() gets the eb from ocfs2_read_extent_block(). + * Any corruption is a code bug. */ + BUG_ON(!OCFS2_IS_VALID_EXTENT_BLOCK(eb)); *new_last_eb = bh; get_bh(*new_last_eb); @@ -7140,20 +7191,14 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb, ocfs2_init_dealloc_ctxt(&(*tc)->tc_dealloc); if (fe->id2.i_list.l_tree_depth) { - status = ocfs2_read_block(inode, le64_to_cpu(fe->i_last_eb_blk), - &last_eb_bh); + status = ocfs2_read_extent_block(inode, + le64_to_cpu(fe->i_last_eb_blk), + &last_eb_bh); if (status < 0) { mlog_errno(status); goto bail; } eb = (struct ocfs2_extent_block *) last_eb_bh->b_data; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - - brelse(last_eb_bh); - status = -EIO; - goto bail; - } } (*tc)->tc_last_eb_bh = last_eb_bh; diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h index 0fbf8fc55a49..59d37d1b7d4c 100644 --- a/fs/ocfs2/alloc.h +++ b/fs/ocfs2/alloc.h @@ -73,6 +73,14 @@ void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et, struct buffer_head *bh, struct ocfs2_xattr_value_root *xv); +/* + * Read an extent block into *bh. If *bh is NULL, a bh will be + * allocated. This is a cached read. The extent block will be validated + * with ocfs2_validate_extent_block(). + */ +int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno, + struct buffer_head **bh); + struct ocfs2_alloc_context; int ocfs2_insert_extent(struct ocfs2_super *osb, handle_t *handle, diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c index b686b31cf49c..0bd9d9698a24 100644 --- a/fs/ocfs2/extent_map.c +++ b/fs/ocfs2/extent_map.c @@ -293,7 +293,7 @@ static int ocfs2_last_eb_is_empty(struct inode *inode, struct ocfs2_extent_block *eb; struct ocfs2_extent_list *el; - ret = ocfs2_read_block(inode, last_eb_blk, &eb_bh); + ret = ocfs2_read_extent_block(inode, last_eb_blk, &eb_bh); if (ret) { mlog_errno(ret); goto out; @@ -302,12 +302,6 @@ static int ocfs2_last_eb_is_empty(struct inode *inode, eb = (struct ocfs2_extent_block *) eb_bh->b_data; el = &eb->h_list; - if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) { - ret = -EROFS; - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb); - goto out; - } - if (el->l_tree_depth) { ocfs2_error(inode->i_sb, "Inode %lu has non zero tree depth in " @@ -381,23 +375,16 @@ static int ocfs2_figure_hole_clusters(struct inode *inode, if (le64_to_cpu(eb->h_next_leaf_blk) == 0ULL) goto no_more_extents; - ret = ocfs2_read_block(inode, - le64_to_cpu(eb->h_next_leaf_blk), - &next_eb_bh); + ret = ocfs2_read_extent_block(inode, + le64_to_cpu(eb->h_next_leaf_blk), + &next_eb_bh); if (ret) { mlog_errno(ret); goto out; } - next_eb = (struct ocfs2_extent_block *)next_eb_bh->b_data; - - if (!OCFS2_IS_VALID_EXTENT_BLOCK(next_eb)) { - ret = -EROFS; - OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, next_eb); - goto out; - } + next_eb = (struct ocfs2_extent_block *)next_eb_bh->b_data; el = &next_eb->h_list; - i = ocfs2_search_for_hole_index(el, v_cluster); } diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index 82ba887afa0d..f04b229fc757 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -447,14 +447,6 @@ static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) -#define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb) do { \ - typeof(__eb) ____eb = (__eb); \ - ocfs2_error((__sb), \ - "Extent Block # %llu has bad signature %.*s", \ - (unsigned long long)le64_to_cpu((____eb)->h_blkno), 7, \ - (____eb)->h_signature); \ -} while (0) - #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))