diff options
Diffstat (limited to 'fs/ocfs2')
| -rw-r--r-- | fs/ocfs2/alloc.c | 480 | ||||
| -rw-r--r-- | fs/ocfs2/file.c | 31 | ||||
| -rw-r--r-- | fs/ocfs2/inode.c | 46 |
3 files changed, 320 insertions, 237 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index 85a05f1..9a40603 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -2921,12 +2921,13 @@ int ocfs2_truncate_log_init(struct ocfs2_super *osb) * block will be so we can update his h_next_leaf_blk field, as well * as the dinodes i_last_eb_blk */ static int ocfs2_find_new_last_ext_blk(struct inode *inode, - u32 new_i_clusters, + unsigned int clusters_to_del, struct ocfs2_path *path, struct buffer_head **new_last_eb) { - int ret = 0; + int next_free, ret = 0; u32 cpos; + struct ocfs2_extent_rec *rec; struct ocfs2_extent_block *eb; struct ocfs2_extent_list *el; struct buffer_head *bh = NULL; @@ -2939,20 +2940,48 @@ static int ocfs2_find_new_last_ext_blk(struct inode *inode, /* trunc to zero special case - this makes tree_depth = 0 * regardless of what it is. */ - if (!new_i_clusters) + if (OCFS2_I(inode)->ip_clusters == clusters_to_del) goto out; el = path_leaf_el(path); BUG_ON(!el->l_next_free_rec); - /* Make sure that this guy will actually be empty after we - * clear away the data. */ + /* + * Make sure that this extent list will actually be empty + * after we clear away the data. We can shortcut out if + * there's more than one non-empty extent in the + * list. Otherwise, a check of the remaining extent is + * necessary. + */ + next_free = le16_to_cpu(el->l_next_free_rec); + rec = NULL; if (ocfs2_is_empty_extent(&el->l_recs[0])) { - if (le16_to_cpu(el->l_next_free_rec) > 1 && - le32_to_cpu(el->l_recs[1].e_cpos) < new_i_clusters) + if (next_free > 2) goto out; - } else if (le32_to_cpu(el->l_recs[0].e_cpos) < new_i_clusters) - goto out; + + /* We may have a valid extent in index 1, check it. */ + if (next_free == 2) + rec = &el->l_recs[1]; + + /* + * Fall through - no more nonempty extents, so we want + * to delete this leaf. + */ + } else { + if (next_free > 1) + goto out; + + rec = &el->l_recs[0]; + } + + if (rec) { + /* + * Check it we'll only be trimming off the end of this + * cluster. + */ + if (le16_to_cpu(rec->e_clusters) > clusters_to_del) + goto out; + } ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, path, &cpos); if (ret) { @@ -2984,6 +3013,223 @@ out: return ret; } +/* + * Trim some clusters off the rightmost edge of a tree. Only called + * during truncate. + * + * The caller needs to: + * - start journaling of each path component. + * - compute and fully set up any new last ext block + */ +static int ocfs2_trim_tree(struct inode *inode, struct ocfs2_path *path, + handle_t *handle, struct ocfs2_truncate_context *tc, + u32 clusters_to_del, u64 *delete_start) +{ + int ret, i, index = path->p_tree_depth; + u32 new_edge = 0; + u64 deleted_eb = 0; + struct buffer_head *bh; + struct ocfs2_extent_list *el; + struct ocfs2_extent_rec *rec; + + *delete_start = 0; + + while (index >= 0) { + bh = path->p_node[index].bh; + el = path->p_node[index].el; + + mlog(0, "traveling tree (index = %d, block = %llu)\n", + index, (unsigned long long)bh->b_blocknr); + + BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0); + + if (index != + (path->p_tree_depth - le16_to_cpu(el->l_tree_depth))) { + ocfs2_error(inode->i_sb, + "Inode %lu has invalid ext. block %llu", + inode->i_ino, + (unsigned long long)bh->b_blocknr); + ret = -EROFS; + goto out; + } + +find_tail_record: + i = le16_to_cpu(el->l_next_free_rec) - 1; + rec = &el->l_recs[i]; + + mlog(0, "Extent list before: record %d: (%u, %u, %llu), " + "next = %u\n", i, le32_to_cpu(rec->e_cpos), + le32_to_cpu(rec->e_clusters), + (unsigned long long)le64_to_cpu(rec->e_blkno), + le16_to_cpu(el->l_next_free_rec)); + + BUG_ON(le32_to_cpu(rec->e_clusters) < clusters_to_del); + + if (le16_to_cpu(el->l_tree_depth) == 0) { + /* + * If the leaf block contains a single empty + * extent and no records, we can just remove + * the block. + */ + if (i == 0 && ocfs2_is_empty_extent(rec)) { + memset(rec, 0, + sizeof(struct ocfs2_extent_rec)); + el->l_next_free_rec = cpu_to_le16(0); + + goto delete; + } + + /* + * Remove any empty extents by shifting things + * left. That should make life much easier on + * the code below. This condition is rare + * enough that we shouldn't see a performance + * hit. + */ + if (ocfs2_is_empty_extent(&el->l_recs[0])) { + le16_add_cpu(&el->l_next_free_rec, -1); + + for(i = 0; + i < le16_to_cpu(el->l_next_free_rec); i++) + el->l_recs[i] = el->l_recs[i + 1]; + + memset(&el->l_recs[i], 0, + sizeof(struct ocfs2_extent_rec)); + + /* + * We've modified our extent list. The + * simplest way to handle this change + * is to being the search from the + * start again. + */ + goto find_tail_record; + } + + le32_add_cpu(&rec->e_clusters, -clusters_to_del); + + /* + * We'll use "new_edge" on our way back up the + * tree to know what our rightmost cpos is. + */ + new_edge = le32_to_cpu(rec->e_clusters); + new_edge += le32_to_cpu(rec->e_cpos); + + /* + * The caller will use this to delete data blocks. + */ + *delete_start = le64_to_cpu(rec->e_blkno) + + ocfs2_clusters_to_blocks(inode->i_sb, + le32_to_cpu(rec->e_clusters)); + + /* + * If it's now empty, remove this record. + */ + if (le32_to_cpu(rec->e_clusters) == 0) { + memset(rec, 0, + sizeof(struct ocfs2_extent_rec)); + le16_add_cpu(&el->l_next_free_rec, -1); + } + } else { + if (le64_to_cpu(rec->e_blkno) == deleted_eb) { + memset(rec, 0, + sizeof(struct ocfs2_extent_rec)); + le16_add_cpu(&el->l_next_free_rec, -1); + + goto delete; + } + + /* Can this actually happen? */ + if (le16_to_cpu(el->l_next_free_rec) == 0) + goto delete; + + /* + * We never actually deleted any clusters + * because our leaf was empty. There's no + * reason to adjust the rightmost edge then. + */ + if (new_edge == 0) + goto delete; + + rec->e_clusters = cpu_to_le32(new_edge); + le32_add_cpu(&rec->e_clusters, + -le32_to_cpu(rec->e_cpos)); + + /* + * A deleted child record should have been + * caught above. + */ + BUG_ON(le32_to_cpu(rec->e_clusters) == 0); + } + +delete: + ret = ocfs2_journal_dirty(handle, bh); + if (ret) { + mlog_errno(ret); + goto out; + } + + mlog(0, "extent list container %llu, after: record %d: " + "(%u, %u, %llu), next = %u.\n", + (unsigned long long)bh->b_blocknr, i, + le32_to_cpu(rec->e_cpos), le32_to_cpu(rec->e_clusters), + (unsigned long long)le64_to_cpu(rec->e_blkno), + le16_to_cpu(el->l_next_free_rec)); + + /* + * We must be careful to only attempt delete of an + * extent block (and not the root inode block). + */ + if (index > 0 && le16_to_cpu(el->l_next_free_rec) == 0) { + struct ocfs2_extent_block *eb = + (struct ocfs2_extent_block *)bh->b_data; + + /* + * Save this for use when processing the + * parent block. + */ + deleted_eb = le64_to_cpu(eb->h_blkno); + + mlog(0, "deleting this extent block.\n"); + + ocfs2_remove_from_cache(inode, bh); + + BUG_ON(le32_to_cpu(el->l_recs[0].e_clusters)); + BUG_ON(le32_to_cpu(el->l_recs[0].e_cpos)); + BUG_ON(le64_to_cpu(el->l_recs[0].e_blkno)); + + if (le16_to_cpu(eb->h_suballoc_slot) == 0) { + /* + * This code only understands how to + * lock the suballocator in slot 0, + * which is fine because allocation is + * only ever done out of that + * suballocator too. A future version + * might change that however, so avoid + * a free if we don't know how to + * handle it. This way an fs incompat + * bit will not be necessary. + */ + ret = ocfs2_free_extent_block(handle, + tc->tc_ext_alloc_inode, + tc->tc_ext_alloc_bh, + eb); + + /* An error here is not fatal. */ + if (ret < 0) + mlog_errno(ret); + } + } else { + deleted_eb = 0; + } + + index--; + } + + ret = 0; +out: + return ret; +} + static int ocfs2_do_truncate(struct ocfs2_super *osb, unsigned int clusters_to_del, struct inode *inode, @@ -2992,20 +3238,16 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb, struct ocfs2_truncate_context *tc, struct ocfs2_path *path) { - int status, i, index; + int status; struct ocfs2_dinode *fe; - struct ocfs2_extent_block *eb; struct ocfs2_extent_block *last_eb = NULL; struct ocfs2_extent_list *el; - struct buffer_head *eb_bh = NULL; struct buffer_head *last_eb_bh = NULL; u64 delete_blk = 0; fe = (struct ocfs2_dinode *) fe_bh->b_data; - status = ocfs2_find_new_last_ext_blk(inode, - le32_to_cpu(fe->i_clusters) - - clusters_to_del, + status = ocfs2_find_new_last_ext_blk(inode, clusters_to_del, path, &last_eb_bh); if (status < 0) { mlog_errno(status); @@ -3016,14 +3258,10 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb, * Each component will be touched, so we might as well journal * here to avoid having to handle errors later. */ - for (i = 0; i < path_num_items(path); i++) { - status = ocfs2_journal_access(handle, inode, - path->p_node[i].bh, - OCFS2_JOURNAL_ACCESS_WRITE); - if (status < 0) { - mlog_errno(status); - goto bail; - } + status = ocfs2_journal_access_path(inode, handle, path); + if (status < 0) { + mlog_errno(status); + goto bail; } if (last_eb_bh) { @@ -3047,6 +3285,7 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb, ocfs2_error(inode->i_sb, "Inode %lu has an empty extent record, depth %u\n", inode->i_ino, le16_to_cpu(el->l_tree_depth)); + status = -EROFS; goto bail; } @@ -3056,38 +3295,11 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb, spin_unlock(&OCFS2_I(inode)->ip_lock); le32_add_cpu(&fe->i_clusters, -clusters_to_del); - i = le16_to_cpu(el->l_next_free_rec) - 1; - - BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del); - le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del); - /* tree depth zero, we can just delete the clusters, otherwise - * we need to record the offset of the next level extent block - * as we may overwrite it. */ - if (!el->l_tree_depth) { - delete_blk = le64_to_cpu(el->l_recs[i].e_blkno) - + ocfs2_clusters_to_blocks(osb->sb, - le32_to_cpu(el->l_recs[i].e_clusters)); - - if (!el->l_recs[i].e_clusters) { - /* if we deleted the whole extent record, then clear - * out the other fields and update the extent - * list. - */ - el->l_recs[i].e_cpos = 0; - el->l_recs[i].e_blkno = 0; - BUG_ON(!el->l_next_free_rec); - le16_add_cpu(&el->l_next_free_rec, -1); - - /* - * The leftmost record might be an empty extent - - * delete it here too. - */ - if (i == 1 && ocfs2_is_empty_extent(&el->l_recs[0])) { - el->l_recs[0].e_cpos = 0; - el->l_recs[0].e_blkno = 0; - el->l_next_free_rec = 0; - } - } + status = ocfs2_trim_tree(inode, path, handle, tc, + clusters_to_del, &delete_blk); + if (status) { + mlog_errno(status); + goto bail; } if (le32_to_cpu(fe->i_clusters) == 0) { @@ -3115,125 +3327,13 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb, } } - index = 1; - /* if our tree depth > 0, update all the tree blocks below us. */ - while (index <= path->p_tree_depth) { - eb_bh = path->p_node[index].bh; - eb = (struct ocfs2_extent_block *)eb_bh->b_data; - el = path->p_node[index].el; - - mlog(0, "traveling tree (index = %d, extent block: %llu)\n", - index, (unsigned long long)eb_bh->b_blocknr); - - BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0); - if (index != - (path->p_tree_depth - le16_to_cpu(el->l_tree_depth))) { - ocfs2_error(inode->i_sb, - "Inode %lu has invalid ext. block %llu\n", - inode->i_ino, - (unsigned long long)eb_bh->b_blocknr); - goto bail; - } - - i = le16_to_cpu(el->l_next_free_rec) - 1; - - mlog(0, "extent block %llu, before: record %d: " - "(%u, %u, %llu), next = %u\n", - (unsigned long long)le64_to_cpu(eb->h_blkno), i, - le32_to_cpu(el->l_recs[i].e_cpos), - le32_to_cpu(el->l_recs[i].e_clusters), - (unsigned long long)le64_to_cpu(el->l_recs[i].e_blkno), - le16_to_cpu(el->l_next_free_rec)); - - BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del); - le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del); - - /* bottom-most block requires us to delete data.*/ - if (!el->l_tree_depth) - delete_blk = le64_to_cpu(el->l_recs[i].e_blkno) - + ocfs2_clusters_to_blocks(osb->sb, - le32_to_cpu(el->l_recs[i].e_clusters)); - if (!el->l_recs[i].e_clusters) { - el->l_recs[i].e_cpos = 0; - el->l_recs[i].e_blkno = 0; - BUG_ON(!el->l_next_free_rec); - le16_add_cpu(&el->l_next_free_rec, -1); - } - if (i == 1 && ocfs2_is_empty_extent(&el->l_recs[0])) { - el->l_recs[0].e_cpos = 0; - el->l_recs[0].e_blkno = 0; - el->l_next_free_rec = 0; - } - - mlog(0, "extent block %llu, after: record %d: " - "(%u, %u, %llu), next = %u\n", - (unsigned long long)le64_to_cpu(eb->h_blkno), i, - le32_to_cpu(el->l_recs[i].e_cpos), - le32_to_cpu(el->l_recs[i].e_clusters), - (unsigned long long)le64_to_cpu(el->l_recs[i].e_blkno), - le16_to_cpu(el->l_next_free_rec)); - - status = ocfs2_journal_dirty(handle, eb_bh); + if (delete_blk) { + status = ocfs2_truncate_log_append(osb, handle, delete_blk, + clusters_to_del); if (status < 0) { mlog_errno(status); goto bail; } - - if (!el->l_next_free_rec) { - mlog(0, "deleting this extent block.\n"); - - ocfs2_remove_from_cache(inode, eb_bh); - - BUG_ON(el->l_recs[0].e_clusters); - BUG_ON(el->l_recs[0].e_cpos); - BUG_ON(el->l_recs[0].e_blkno); - - /* - * We need to remove this extent block from - * the list above it. - * - * Since we've passed it already in this loop, - * no need to worry about journaling. - */ - el = path->p_node[index - 1].el; - i = le16_to_cpu(el->l_next_free_rec) - 1; - BUG_ON(i < 0); - el->l_recs[i].e_cpos = 0; - el->l_recs[i].e_clusters = 0; - el->l_recs[i].e_blkno = 0; - le16_add_cpu(&el->l_next_free_rec, -1); - - if (eb->h_suballoc_slot == 0) { - /* - * This code only understands how to - * lock the suballocator in slot 0, - * which is fine because allocation is - * only ever done out of that - * suballocator too. A future version - * might change that however, so avoid - * a free if we don't know how to - * handle it. This way an fs incompat - * bit will not be necessary. - */ - status = ocfs2_free_extent_block(handle, - tc->tc_ext_alloc_inode, - tc->tc_ext_alloc_bh, - eb); - if (status < 0) { - mlog_errno(status); - goto bail; - } - } - } - index++; - } - - BUG_ON(!delete_blk); - status = ocfs2_truncate_log_append(osb, handle, delete_blk, - clusters_to_del); - if (status < 0) { - mlog_errno(status); - goto bail; } status = 0; bail: @@ -3275,6 +3375,14 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb, } start: /* + * Check that we still have allocation to delete. + */ + if (OCFS2_I(inode)->ip_clusters == 0) { + status = 0; + goto bail; + } + + /* * Truncate always works against the rightmost tree branch. */ status = ocfs2_find_path(inode, path, UINT_MAX); @@ -3298,6 +3406,15 @@ start: * - no record needs to be removed (truncate has completed) */ el = path_leaf_el(path); + if (le16_to_cpu(el->l_next_free_rec) == 0) { + ocfs2_error(inode->i_sb, + "Inode %llu has empty extent block at %llu\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)path_leaf_bh(path)->b_blocknr); + status = -EROFS; + goto bail; + } + i = le16_to_cpu(el->l_next_free_rec) - 1; range = le32_to_cpu(el->l_recs[i].e_cpos) + le32_to_cpu(el->l_recs[i].e_clusters); @@ -3359,10 +3476,11 @@ start: ocfs2_reinit_path(path, 1); /* - * Only loop if we still have allocation. + * The check above will catch the case where we've truncated + * away all allocation. */ - if (OCFS2_I(inode)->ip_clusters) - goto start; + goto start; + bail: up_write(&OCFS2_I(inode)->ip_alloc_sem); @@ -3414,22 +3532,6 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb, "%llu\n", fe->i_clusters, new_i_clusters, (unsigned long long)fe->i_size); - if (!ocfs2_sparse_alloc(osb) && - le32_to_cpu(fe->i_clusters) <= new_i_clusters) { - ocfs2_error(inode->i_sb, "Dinode %llu has cluster count " - "%u and size %llu whereas struct inode has " - "cluster count %u and size %llu which caused an " - "invalid truncate to %u clusters.", - (unsigned long long)le64_to_cpu(fe->i_blkno), - le32_to_cpu(fe->i_clusters), - (unsigned long long)le64_to_cpu(fe->i_size), - OCFS2_I(inode)->ip_clusters, i_size_read(inode), - new_i_clusters); - mlog_meta_lvb(ML_ERROR, &OCFS2_I(inode)->ip_meta_lockres); - status = -EIO; - goto bail; - } - *tc = kzalloc(sizeof(struct ocfs2_truncate_context), GFP_KERNEL); if (!(*tc)) { status = -ENOMEM; diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 8c97fa1..edc0b61 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -344,18 +344,6 @@ static int ocfs2_truncate_file(struct inode *inode, } ocfs2_data_unlock(inode, 1); - if (le32_to_cpu(fe->i_clusters) == - ocfs2_clusters_for_bytes(osb->sb, new_i_size)) { - mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n", - fe->i_clusters); - /* No allocation change is required, so lets fast path - * this truncate. */ - status = ocfs2_simple_size_update(inode, di_bh, new_i_size); - if (status < 0) - mlog_errno(status); - goto bail; - } - /* alright, we're going to need to do a full blown alloc size * change. Orphan the inode so that recovery can complete the * truncate if necessary. This does the task of marking @@ -785,7 +773,7 @@ static int ocfs2_extend_file(struct inode *inode, size_t tail_to_skip) { int ret = 0; - u32 clusters_to_add; + u32 clusters_to_add = 0; BUG_ON(!tail_to_skip && !di_bh); @@ -797,6 +785,11 @@ static int ocfs2_extend_file(struct inode *inode, goto out; BUG_ON(new_i_size < i_size_read(inode)); + if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { + BUG_ON(tail_to_skip != 0); + goto out_update_size; + } + clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - OCFS2_I(inode)->ip_clusters; @@ -832,6 +825,7 @@ static int ocfs2_extend_file(struct inode *inode, goto out_unlock; } +out_update_size: if (!tail_to_skip) { /* We're being called from ocfs2_setattr() which wants * us to update i_size */ @@ -841,7 +835,8 @@ static int ocfs2_extend_file(struct inode *inode, } out_unlock: - ocfs2_data_unlock(inode, 1); + if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) + ocfs2_data_unlock(inode, 1); out: return ret; @@ -1097,6 +1092,14 @@ static int ocfs2_prepare_inode_for_write(struct dentry *dentry, } else { saved_pos = *ppos; } + + /* + * The rest of this loop is concerned with legacy file + * systems which don't support sparse files. + */ + if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) + break; + newsize = count + saved_pos; mlog(0, "pos=%lld newsize=%lld cursize=%lld\n", diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c index 5ff8549..0bd86a1 100644 --- a/fs/ocfs2/inode.c +++ b/fs/ocfs2/inode.c @@ -487,7 +487,6 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb, struct buffer_head *fe_bh) { int status = 0; - handle_t *handle = NULL; struct ocfs2_truncate_context *tc = NULL; struct ocfs2_dinode *fe; @@ -495,41 +494,20 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb, fe = (struct ocfs2_dinode *) fe_bh->b_data; - /* zero allocation, zero truncate :) */ - if (!fe->i_clusters) - goto bail; - - handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); - if (IS_ERR(handle)) { - status = PTR_ERR(handle); - handle = NULL; - mlog_errno(status); - goto bail; - } - - status = ocfs2_set_inode_size(handle, inode, fe_bh, 0ULL); - if (status < 0) { - mlog_errno(status); - goto bail; - } - - ocfs2_commit_trans(osb, handle); - handle = NULL; - - status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc); - if (status < 0) { - mlog_errno(status); - goto bail; - } + if (fe->i_clusters) { + status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc); + if (status < 0) { + mlog_errno(status); + goto out; + } - status = ocfs2_commit_truncate(osb, inode, fe_bh, tc); - if (status < 0) { - mlog_errno(status); - goto bail; + status = ocfs2_commit_truncate(osb, inode, fe_bh, tc); + if (status < 0) { + mlog_errno(status); + goto out; + } } -bail: - if (handle) - ocfs2_commit_trans(osb, handle); +out: mlog_exit(status); return status; |
