diff options
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 763 |
1 files changed, 394 insertions, 369 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 3e0f6af9d08..42272d67955 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -149,7 +149,7 @@ int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, int ret; /* - * Drop i_data_sem to avoid deadlock with ext4_get_blocks At this + * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this * moment, get_block can be called only for blocks inside i_size since * page cache has been already dropped and writes are blocked by * i_mutex. So we can safely drop the i_data_sem here. @@ -348,9 +348,8 @@ static int __ext4_check_blockref(const char *function, struct inode *inode, if (blk && unlikely(!ext4_data_block_valid(EXT4_SB(inode->i_sb), blk, 1))) { - __ext4_error(inode->i_sb, function, - "invalid block reference %u " - "in inode #%lu", blk, inode->i_ino); + ext4_error_inode(function, inode, + "invalid block reference %u", blk); return -EIO; } } @@ -785,7 +784,7 @@ failed: /* Allocation failed, free what we already allocated */ ext4_free_blocks(handle, inode, 0, new_blocks[0], 1, 0); for (i = 1; i <= n ; i++) { - /* + /* * branch[i].bh is newly allocated, so there is no * need to revoke the block, which is why we don't * need to set EXT4_FREE_BLOCKS_METADATA. @@ -875,7 +874,7 @@ static int ext4_splice_branch(handle_t *handle, struct inode *inode, err_out: for (i = 1; i <= num; i++) { - /* + /* * branch[i].bh is newly allocated, so there is no * need to revoke the block, which is why we don't * need to set EXT4_FREE_BLOCKS_METADATA. @@ -890,9 +889,9 @@ err_out: } /* - * The ext4_ind_get_blocks() function handles non-extents inodes + * The ext4_ind_map_blocks() function handles non-extents inodes * (i.e., using the traditional indirect/double-indirect i_blocks - * scheme) for ext4_get_blocks(). + * scheme) for ext4_map_blocks(). * * Allocation strategy is simple: if we have to allocate something, we will * have to go the whole way to leaf. So let's do it before attaching anything @@ -917,9 +916,8 @@ err_out: * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system * blocks. */ -static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode, - ext4_lblk_t iblock, unsigned int maxblocks, - struct buffer_head *bh_result, +static int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, + struct ext4_map_blocks *map, int flags) { int err = -EIO; @@ -933,9 +931,9 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode, int count = 0; ext4_fsblk_t first_block = 0; - J_ASSERT(!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)); + J_ASSERT(!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))); J_ASSERT(handle != NULL || (flags & EXT4_GET_BLOCKS_CREATE) == 0); - depth = ext4_block_to_path(inode, iblock, offsets, + depth = ext4_block_to_path(inode, map->m_lblk, offsets, &blocks_to_boundary); if (depth == 0) @@ -946,10 +944,9 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode, /* Simplest case - block found, no allocation needed */ if (!partial) { first_block = le32_to_cpu(chain[depth - 1].key); - clear_buffer_new(bh_result); count++; /*map more blocks*/ - while (count < maxblocks && count <= blocks_to_boundary) { + while (count < map->m_len && count <= blocks_to_boundary) { ext4_fsblk_t blk; blk = le32_to_cpu(*(chain[depth-1].p + count)); @@ -969,7 +966,7 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode, /* * Okay, we need to do block allocation. */ - goal = ext4_find_goal(inode, iblock, partial); + goal = ext4_find_goal(inode, map->m_lblk, partial); /* the number of blocks need to allocate for [d,t]indirect blocks */ indirect_blks = (chain + depth) - partial - 1; @@ -979,11 +976,11 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode, * direct blocks to allocate for this branch. */ count = ext4_blks_to_allocate(partial, indirect_blks, - maxblocks, blocks_to_boundary); + map->m_len, blocks_to_boundary); /* * Block out ext4_truncate while we alter the tree */ - err = ext4_alloc_branch(handle, inode, iblock, indirect_blks, + err = ext4_alloc_branch(handle, inode, map->m_lblk, indirect_blks, &count, goal, offsets + (partial - chain), partial); @@ -995,18 +992,20 @@ static int ext4_ind_get_blocks(handle_t *handle, struct inode *inode, * may need to return -EAGAIN upwards in the worst case. --sct */ if (!err) - err = ext4_splice_branch(handle, inode, iblock, + err = ext4_splice_branch(handle, inode, map->m_lblk, partial, indirect_blks, count); if (err) goto cleanup; - set_buffer_new(bh_result); + map->m_flags |= EXT4_MAP_NEW; ext4_update_inode_fsync_trans(handle, inode, 1); got_it: - map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key)); + map->m_flags |= EXT4_MAP_MAPPED; + map->m_pblk = le32_to_cpu(chain[depth-1].key); + map->m_len = count; if (count > blocks_to_boundary) - set_buffer_boundary(bh_result); + map->m_flags |= EXT4_MAP_BOUNDARY; err = count; /* Clean up and exit */ partial = chain + depth - 1; /* the whole chain */ @@ -1016,7 +1015,6 @@ cleanup: brelse(partial->bh); partial--; } - BUFFER_TRACE(bh_result, "returned"); out: return err; } @@ -1061,7 +1059,7 @@ static int ext4_indirect_calc_metadata_amount(struct inode *inode, */ static int ext4_calc_metadata_amount(struct inode *inode, sector_t lblock) { - if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) return ext4_ext_calc_metadata_amount(inode, lblock); return ext4_indirect_calc_metadata_amount(inode, lblock); @@ -1076,7 +1074,6 @@ void ext4_da_update_reserve_space(struct inode *inode, { struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); struct ext4_inode_info *ei = EXT4_I(inode); - int mdb_free = 0, allocated_meta_blocks = 0; spin_lock(&ei->i_block_reservation_lock); trace_ext4_da_update_reserve_space(inode, used); @@ -1091,11 +1088,10 @@ void ext4_da_update_reserve_space(struct inode *inode, /* Update per-inode reservations */ ei->i_reserved_data_blocks -= used; - used += ei->i_allocated_meta_blocks; ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks; - allocated_meta_blocks = ei->i_allocated_meta_blocks; + percpu_counter_sub(&sbi->s_dirtyblocks_counter, + used + ei->i_allocated_meta_blocks); ei->i_allocated_meta_blocks = 0; - percpu_counter_sub(&sbi->s_dirtyblocks_counter, used); if (ei->i_reserved_data_blocks == 0) { /* @@ -1103,30 +1099,23 @@ void ext4_da_update_reserve_space(struct inode *inode, * only when we have written all of the delayed * allocation blocks. */ - mdb_free = ei->i_reserved_meta_blocks; + percpu_counter_sub(&sbi->s_dirtyblocks_counter, + ei->i_reserved_meta_blocks); ei->i_reserved_meta_blocks = 0; ei->i_da_metadata_calc_len = 0; - percpu_counter_sub(&sbi->s_dirtyblocks_counter, mdb_free); } spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); - /* Update quota subsystem */ - if (quota_claim) { + /* Update quota subsystem for data blocks */ + if (quota_claim) dquot_claim_block(inode, used); - if (mdb_free) - dquot_release_reservation_block(inode, mdb_free); - } else { + else { /* * We did fallocate with an offset that is already delayed * allocated. So on delayed allocated writeback we should - * not update the quota for allocated blocks. But then - * converting an fallocate region to initialized region would - * have caused a metadata allocation. So claim quota for - * that + * not re-claim the quota for fallocated blocks. */ - if (allocated_meta_blocks) - dquot_claim_block(inode, allocated_meta_blocks); - dquot_release_reservation_block(inode, mdb_free + used); + dquot_release_reservation_block(inode, used); } /* @@ -1139,15 +1128,15 @@ void ext4_da_update_reserve_space(struct inode *inode, ext4_discard_preallocations(inode); } -static int check_block_validity(struct inode *inode, const char *msg, - sector_t logical, sector_t phys, int len) +static int check_block_validity(struct inode *inode, const char *func, + struct ext4_map_blocks *map) { - if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), phys, len)) { - __ext4_error(inode->i_sb, msg, - "inode #%lu logical block %llu mapped to %llu " - "(size %d)", inode->i_ino, - (unsigned long long) logical, - (unsigned long long) phys, len); + if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), map->m_pblk, + map->m_len)) { + ext4_error_inode(func, inode, + "lblock %lu mapped to illegal pblock %llu " + "(length %d)", (unsigned long) map->m_lblk, + map->m_pblk, map->m_len); return -EIO; } return 0; @@ -1212,15 +1201,15 @@ static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, } /* - * The ext4_get_blocks() function tries to look up the requested blocks, + * The ext4_map_blocks() function tries to look up the requested blocks, * and returns if the blocks are already mapped. * * Otherwise it takes the write lock of the i_data_sem and allocate blocks * and store the allocated blocks in the result buffer head and mark it * mapped. * - * If file type is extents based, it will call ext4_ext_get_blocks(), - * Otherwise, call with ext4_ind_get_blocks() to handle indirect mapping + * If file type is extents based, it will call ext4_ext_map_blocks(), + * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping * based files * * On success, it returns the number of blocks being mapped or allocate. @@ -1233,35 +1222,29 @@ static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, * * It returns the error in case of allocation failure. */ -int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block, - unsigned int max_blocks, struct buffer_head *bh, - int flags) +int ext4_map_blocks(handle_t *handle, struct inode *inode, + struct ext4_map_blocks *map, int flags) { int retval; - clear_buffer_mapped(bh); - clear_buffer_unwritten(bh); - - ext_debug("ext4_get_blocks(): inode %lu, flag %d, max_blocks %u," - "logical block %lu\n", inode->i_ino, flags, max_blocks, - (unsigned long)block); + map->m_flags = 0; + ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u," + "logical block %lu\n", inode->i_ino, flags, map->m_len, + (unsigned long) map->m_lblk); /* * Try to see if we can get the block without requesting a new * file system block. */ down_read((&EXT4_I(inode)->i_data_sem)); - if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) { - retval = ext4_ext_get_blocks(handle, inode, block, max_blocks, - bh, 0); + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { + retval = ext4_ext_map_blocks(handle, inode, map, 0); } else { - retval = ext4_ind_get_blocks(handle, inode, block, max_blocks, - bh, 0); + retval = ext4_ind_map_blocks(handle, inode, map, 0); } up_read((&EXT4_I(inode)->i_data_sem)); - if (retval > 0 && buffer_mapped(bh)) { - int ret = check_block_validity(inode, "file system corruption", - block, bh->b_blocknr, retval); + if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { + int ret = check_block_validity(inode, __func__, map); if (ret != 0) return ret; } @@ -1277,7 +1260,7 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block, * ext4_ext_get_block() returns th create = 0 * with buffer head unmapped. */ - if (retval > 0 && buffer_mapped(bh)) + if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) return retval; /* @@ -1290,7 +1273,7 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block, * of BH_Unwritten and BH_Mapped flags being simultaneously * set on the buffer_head. */ - clear_buffer_unwritten(bh); + map->m_flags &= ~EXT4_MAP_UNWRITTEN; /* * New blocks allocate and/or writing to uninitialized extent @@ -1312,14 +1295,12 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block, * We need to check for EXT4 here because migrate * could have changed the inode type in between */ - if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) { - retval = ext4_ext_get_blocks(handle, inode, block, max_blocks, - bh, flags); + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { + retval = ext4_ext_map_blocks(handle, inode, map, flags); } else { - retval = ext4_ind_get_blocks(handle, inode, block, - max_blocks, bh, flags); + retval = ext4_ind_map_blocks(handle, inode, map, flags); - if (retval > 0 && buffer_new(bh)) { + if (retval > 0 && map->m_flags & EXT4_MAP_NEW) { /* * We allocated new blocks which will result in * i_data's format changing. Force the migrate @@ -1342,10 +1323,10 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block, EXT4_I(inode)->i_delalloc_reserved_flag = 0; up_write((&EXT4_I(inode)->i_data_sem)); - if (retval > 0 && buffer_mapped(bh)) { - int ret = check_block_validity(inode, "file system " - "corruption after allocation", - block, bh->b_blocknr, retval); + if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { + int ret = check_block_validity(inode, + "ext4_map_blocks_after_alloc", + map); if (ret != 0) return ret; } @@ -1355,109 +1336,109 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block, /* Maximum number of blocks we map for direct IO at once. */ #define DIO_MAX_BLOCKS 4096 -int ext4_get_block(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create) +static int _ext4_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh, int flags) { handle_t *handle = ext4_journal_current_handle(); + struct ext4_map_blocks map; int ret = 0, started = 0; - unsigned max_blocks = bh_result->b_size >> inode->i_blkbits; int dio_credits; - if (create && !handle) { + map.m_lblk = iblock; + map.m_len = bh->b_size >> inode->i_blkbits; + + if (flags && !handle) { /* Direct IO write... */ - if (max_blocks > DIO_MAX_BLOCKS) - max_blocks = DIO_MAX_BLOCKS; - dio_credits = ext4_chunk_trans_blocks(inode, max_blocks); + if (map.m_len > DIO_MAX_BLOCKS) + map.m_len = DIO_MAX_BLOCKS; + dio_credits = ext4_chunk_trans_blocks(inode, map.m_len); handle = ext4_journal_start(inode, dio_credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); - goto out; + return ret; } started = 1; } - ret = ext4_get_blocks(handle, inode, iblock, max_blocks, bh_result, - create ? EXT4_GET_BLOCKS_CREATE : 0); + ret = ext4_map_blocks(handle, inode, &map, flags); if (ret > 0) { - bh_result->b_size = (ret << inode->i_blkbits); + map_bh(bh, inode->i_sb, map.m_pblk); + bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; + bh->b_size = inode->i_sb->s_blocksize * map.m_len; ret = 0; } if (started) ext4_journal_stop(handle); -out: return ret; } +int ext4_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh, int create) +{ + return _ext4_get_block(inode, iblock, bh, + create ? EXT4_GET_BLOCKS_CREATE : 0); +} + /* * `handle' can be NULL if create is zero */ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, ext4_lblk_t block, int create, int *errp) { - struct buffer_head dummy; + struct ext4_map_blocks map; + struct buffer_head *bh; int fatal = 0, err; - int flags = 0; J_ASSERT(handle != NULL || create == 0); - dummy.b_state = 0; - dummy.b_blocknr = -1000; - buffer_trace_init(&dummy.b_history); - if (create) - flags |= EXT4_GET_BLOCKS_CREATE; - err = ext4_get_blocks(handle, inode, block, 1, &dummy, flags); - /* - * ext4_get_blocks() returns number of blocks mapped. 0 in - * case of a HOLE. - */ - if (err > 0) { - if (err > 1) - WARN_ON(1); - err = 0; + map.m_lblk = block; + map.m_len = 1; + err = ext4_map_blocks(handle, inode, &map, + create ? EXT4_GET_BLOCKS_CREATE : 0); + + if (err < 0) + *errp = err; + if (err <= 0) + return NULL; + *errp = 0; + + bh = sb_getblk(inode->i_sb, map.m_pblk); + if (!bh) { + *errp = -EIO; + return NULL; } - *errp = err; - if (!err && buffer_mapped(&dummy)) { - struct buffer_head *bh; - bh = sb_getblk(inode->i_sb, dummy.b_blocknr); - if (!bh) { - *errp = -EIO; - goto err; - } - if (buffer_new(&dummy)) { - J_ASSERT(create != 0); - J_ASSERT(handle != NULL); + if (map.m_flags & EXT4_MAP_NEW) { + J_ASSERT(create != 0); + J_ASSERT(handle != NULL); - /* - * Now that we do not always journal data, we should - * keep in mind whether this should always journal the - * new buffer as metadata. For now, regular file - * writes use ext4_get_block instead, so it's not a - * problem. - */ - lock_buffer(bh); - BUFFER_TRACE(bh, "call get_create_access"); - fatal = ext4_journal_get_create_access(handle, bh); - if (!fatal && !buffer_uptodate(bh)) { - memset(bh->b_data, 0, inode->i_sb->s_blocksize); - set_buffer_uptodate(bh); - } - unlock_buffer(bh); - BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); - err = ext4_handle_dirty_metadata(handle, inode, bh); - if (!fatal) - fatal = err; - } else { - BUFFER_TRACE(bh, "not a new buffer"); - } - if (fatal) { - *errp = fatal; - brelse(bh); - bh = NULL; + /* + * Now that we do not always journal data, we should + * keep in mind whether this should always journal the + * new buffer as metadata. For now, regular file + * writes use ext4_get_block instead, so it's not a + * problem. + */ + lock_buffer(bh); + BUFFER_TRACE(bh, "call get_create_access"); + fatal = ext4_journal_get_create_access(handle, bh); + if (!fatal && !buffer_uptodate(bh)) { + memset(bh->b_data, 0, inode->i_sb->s_blocksize); + set_buffer_uptodate(bh); } - return bh; + unlock_buffer(bh); + BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); + err = ext4_handle_dirty_metadata(handle, inode, bh); + if (!fatal) + fatal = err; + } else { + BUFFER_TRACE(bh, "not a new buffer"); } -err: - return NULL; + if (fatal) { + *errp = fatal; + brelse(bh); + bh = NULL; + } + return bh; } struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, @@ -1860,7 +1841,7 @@ static int ext4_da_reserve_space(struct inode *inode, sector_t lblock) int retries = 0; struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); struct ext4_inode_info *ei = EXT4_I(inode); - unsigned long md_needed, md_reserved; + unsigned long md_needed; int ret; /* @@ -1870,22 +1851,24 @@ static int ext4_da_reserve_space(struct inode *inode, sector_t lblock) */ repeat: spin_lock(&ei->i_block_reservation_lock); - md_reserved = ei->i_reserved_meta_blocks; md_needed = ext4_calc_metadata_amount(inode, lblock); trace_ext4_da_reserve_space(inode, md_needed); spin_unlock(&ei->i_block_reservation_lock); /* - * Make quota reservation here to prevent quota overflow - * later. Real quota accounting is done at pages writeout - * time. + * We will charge metadata quota at writeout time; this saves + * us from metadata over-estimation, though we may go over by + * a small amount in the end. Here we just reserve for data. */ - ret = dquot_reserve_block(inode, md_needed + 1); + ret = dquot_reserve_block(inode, 1); if (ret) return ret; - + /* + * We do still charge estimated metadata to the sb though; + * we cannot afford to run out of free blocks. + */ if (ext4_claim_free_blocks(sbi, md_needed + 1)) { - dquot_release_reservation_block(inode, md_needed + 1); + dquot_release_reservation_block(inode, 1); if (ext4_should_retry_alloc(inode->i_sb, &retries)) { yield(); goto repeat; @@ -1910,6 +1893,7 @@ static void ext4_da_release_space(struct inode *inode, int to_free) spin_lock(&EXT4_I(inode)->i_block_reservation_lock); + trace_ext4_da_release_space(inode, to_free); if (unlikely(to_free > ei->i_reserved_data_blocks)) { /* * if there aren't enough reserved blocks, then the @@ -1932,12 +1916,13 @@ static void ext4_da_release_space(struct inode *inode, int to_free) * only when we have written all of the delayed * allocation blocks. */ - to_free += ei->i_reserved_meta_blocks; + percpu_counter_sub(&sbi->s_dirtyblocks_counter, + ei->i_reserved_meta_blocks); ei->i_reserved_meta_blocks = 0; ei->i_da_metadata_calc_len = 0; } - /* update fs dirty blocks counter */ + /* update fs dirty data blocks counter */ percpu_counter_sub(&sbi->s_dirtyblocks_counter, to_free); spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); @@ -2042,28 +2027,23 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd) /* * mpage_put_bnr_to_bhs - walk blocks and assign them actual numbers * - * @mpd->inode - inode to walk through - * @exbh->b_blocknr - first block on a disk - * @exbh->b_size - amount of space in bytes - * @logical - first logical block to start assignment with - * * the function goes through all passed space and put actual disk * block numbers into buffer heads, dropping BH_Delay and BH_Unwritten */ -static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical, - struct buffer_head *exbh) +static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, + struct ext4_map_blocks *map) { struct inode *inode = mpd->inode; struct address_space *mapping = inode->i_mapping; - int blocks = exbh->b_size >> inode->i_blkbits; - sector_t pblock = exbh->b_blocknr, cur_logical; + int blocks = map->m_len; + sector_t pblock = map->m_pblk, cur_logical; struct buffer_head *head, *bh; pgoff_t index, end; struct pagevec pvec; int nr_pages, i; - index = logical >> (PAGE_CACHE_SHIFT - inode->i_blkbits); - end = (logical + blocks - 1) >> (PAGE_CACHE_SHIFT - inode->i_blkbits); + index = map->m_lblk >> (PAGE_CACHE_SHIFT - inode->i_blkbits); + end = (map->m_lblk + blocks - 1) >> (PAGE_CACHE_SHIFT - inode->i_blkbits); cur_logical = index << (PAGE_CACHE_SHIFT - inode->i_blkbits); pagevec_init(&pvec, 0); @@ -2090,17 +2070,16 @@ static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical, /* skip blocks out of the range */ do { - if (cur_logical >= logical) + if (cur_logical >= map->m_lblk) break; cur_logical++; } while ((bh = bh->b_this_page) != head); do { - if (cur_logical >= logical + blocks) + if (cur_logical >= map->m_lblk + blocks) break; - if (buffer_delay(bh) || - buffer_unwritten(bh)) { + if (buffer_delay(bh) || buffer_unwritten(bh)) { BUG_ON(bh->b_bdev != inode->i_sb->s_bdev); @@ -2119,7 +2098,7 @@ static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical, } else if (buffer_mapped(bh)) BUG_ON(bh->b_blocknr != pblock); - if (buffer_uninit(exbh)) + if (map->m_flags & EXT4_MAP_UNINIT) set_buffer_uninit(bh); cur_logical++; pblock++; @@ -2130,21 +2109,6 @@ static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical, } -/* - * __unmap_underlying_blocks - just a helper function to unmap - * set of blocks described by @bh - */ -static inline void __unmap_underlying_blocks(struct inode *inode, - struct buffer_head *bh) -{ - struct block_device *bdev = inode->i_sb->s_bdev; - int blocks, i; - - blocks = bh->b_size >> inode->i_blkbits; - for (i = 0; i < blocks; i++) - unmap_underlying_metadata(bdev, bh->b_blocknr + i); -} - static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd, sector_t logical, long blk_cnt) { @@ -2206,7 +2170,7 @@ static void ext4_print_free_blocks(struct inode *inode) static int mpage_da_map_blocks(struct mpage_da_data *mpd) { int err, blks, get_blocks_flags; - struct buffer_head new; + struct ext4_map_blocks map; sector_t next = mpd->b_blocknr; unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits; loff_t disksize = EXT4_I(mpd->inode)->i_disksize; @@ -2247,15 +2211,15 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd) * EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting * variables are updated after the blocks have been allocated. */ - new.b_state = 0; + map.m_lblk = next; + map.m_len = max_blocks; get_blocks_flags = EXT4_GET_BLOCKS_CREATE; if (ext4_should_dioread_nolock(mpd->inode)) get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT; if (mpd->b_state & (1 << BH_Delay)) get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE; - blks = ext4_get_blocks(handle, mpd->inode, next, max_blocks, - &new, get_blocks_flags); + blks = ext4_map_blocks(handle, mpd->inode, &map, get_blocks_flags); if (blks < 0) { err = blks; /* @@ -2282,7 +2246,7 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd) ext4_msg(mpd->inode->i_sb, KERN_CRIT, "delayed block allocation failed for inode %lu at " "logical offset %llu with max blocks %zd with " - "error %d\n", mpd->inode->i_ino, + "error %d", mpd->inode->i_ino, (unsigned long long) next, mpd->b_size >> mpd->inode->i_blkbits, err); printk(KERN_CRIT "This should not happen!! " @@ -2297,10 +2261,13 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd) } BUG_ON(blks == 0); - new.b_size = (blks << mpd->inode->i_blkbits); + if (map.m_flags & EXT4_MAP_NEW) { + struct block_device *bdev = mpd->inode->i_sb->s_bdev; + int i; - if (buffer_new(&new)) - __unmap_underlying_blocks(mpd->inode, &new); + for (i = 0; i < map.m_len; i++) + unmap_underlying_metadata(bdev, map.m_pblk + i); + } /* * If blocks are delayed marked, we need to @@ -2308,7 +2275,7 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd) */ if ((mpd->b_state & (1 << BH_Delay)) || (mpd->b_state & (1 << BH_Unwritten))) - mpage_put_bnr_to_bhs(mpd, next, &new); + mpage_put_bnr_to_bhs(mpd, &map); if (ext4_should_order_data(mpd->inode)) { err = ext4_jbd2_file_inode(handle, mpd->inode); @@ -2349,8 +2316,17 @@ static void mpage_add_bh_to_extent(struct mpage_da_data *mpd, sector_t next; int nrblocks = mpd->b_size >> mpd->inode->i_blkbits; + /* + * XXX Don't go larger than mballoc is willing to allocate + * This is a stopgap solution. We eventually need to fold + * mpage_da_submit_io() into this function and then call + * ext4_get_blocks() multiple times in a loop + */ + if (nrblocks >= 8*1024*1024/mpd->inode->i_sb->s_blocksize) + goto flush_it; + /* check if thereserved journal credits might overflow */ - if (!(EXT4_I(mpd->inode)->i_flags & EXT4_EXTENTS_FL)) { + if (!(ext4_test_inode_flag(mpd->inode, EXT4_INODE_EXTENTS))) { if (nrblocks >= EXT4_MAX_TRANS_DATA) { /* * With non-extent format we are limited by the journal @@ -2423,17 +2399,6 @@ static int __mpage_da_writepage(struct page *page, struct buffer_head *bh, *head; sector_t logical; - if (mpd->io_done) { - /* - * Rest of the page in the page_vec - * redirty then and skip then. We will - * try to write them again after - * starting a new transaction - */ - redirty_page_for_writepage(wbc, page); - unlock_page(page); - return MPAGE_DA_EXTENT_TAIL; - } /* * Can we merge this page to current extent? */ @@ -2528,8 +2493,9 @@ static int __mpage_da_writepage(struct page *page, * initialized properly. */ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create) + struct buffer_head *bh, int create) { + struct ext4_map_blocks map; int ret = 0; sector_t invalid_block = ~((sector_t) 0xffff); @@ -2537,16 +2503,22 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, invalid_block = ~0; BUG_ON(create == 0); - BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); + BUG_ON(bh->b_size != inode->i_sb->s_blocksize); + + map.m_lblk = iblock; + map.m_len = 1; /* * first, we need to know whether the block is allocated already * preallocated blocks are unmapped but should treated * the same as allocated blocks. */ - ret = ext4_get_blocks(NULL, inode, iblock, 1, bh_result, 0); - if ((ret == 0) && !buffer_delay(bh_result)) { - /* the block isn't (pre)allocated yet, let's reserve space */ + ret = ext4_map_blocks(NULL, inode, &map, 0); + if (ret < 0) + return ret; + if (ret == 0) { + if (buffer_delay(bh)) + return 0; /* Not sure this could or should happen */ /* * XXX: __block_prepare_write() unmaps passed block, * is it OK? @@ -2556,26 +2528,26 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, /* not enough space to reserve */ return ret; - map_bh(bh_result, inode->i_sb, invalid_block); - set_buffer_new(bh_result); - set_buffer_delay(bh_result); - } else if (ret > 0) { - bh_result->b_size = (ret << inode->i_blkbits); - if (buffer_unwritten(bh_result)) { - /* A delayed write to unwritten bh should - * be marked new and mapped. Mapped ensures - * that we don't do get_block multiple times - * when we write to the same offset and new - * ensures that we do proper zero out for - * partial write. - */ - set_buffer_new(bh_result); - set_buffer_mapped(bh_result); - } - ret = 0; + map_bh(bh, inode->i_sb, invalid_block); + set_buffer_new(bh); + set_buffer_delay(bh); + return 0; } - return ret; + map_bh(bh, inode->i_sb, map.m_pblk); + bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; + + if (buffer_unwritten(bh)) { + /* A delayed write to unwritten bh should be marked + * new and mapped. Mapped ensures that we don't do + * get_block multiple times when we write to the same + * offset and new ensures that we do proper zero out + * for partial write. + */ + set_buffer_new(bh); + set_buffer_mapped(bh); + } + return 0; } /* @@ -2597,21 +2569,8 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, static int noalloc_get_block_write(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { - int ret = 0; - unsigned max_blocks = bh_result->b_size >> inode->i_blkbits; - BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); - - /* - * we don't want to do block allocation in writepage - * so call get_block_wrap with create = 0 - */ - ret = ext4_get_blocks(NULL, inode, iblock, max_blocks, bh_result, 0); - if (ret > 0) { - bh_result->b_size = (ret << inode->i_blkbits); - ret = 0; - } - return ret; + return _ext4_get_block(inode, iblock, bh_result, 0); } static int bget_one(handle_t *handle, struct buffer_head *bh) @@ -2821,13 +2780,131 @@ static int ext4_da_writepages_trans_blocks(struct inode *inode) * number of contiguous block. So we will limit * number of contiguous block to a sane value */ - if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) && + if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) && (max_blocks > EXT4_MAX_TRANS_DATA)) max_blocks = EXT4_MAX_TRANS_DATA; return ext4_chunk_trans_blocks(inode, max_blocks); } +/* + * write_cache_pages_da - walk the list of dirty pages of the given + * address space and call the callback function (which usually writes + * the pages). + * + * This is a forked version of write_cache_pages(). Differences: + * Range cyclic is ignored. + * no_nrwrite_index_update is always presumed true + */ +static int write_cache_pages_da(struct address_space *mapping, + struct writeback_control *wbc, + struct mpage_da_data *mpd) +{ + int ret = 0; + int done = 0; + struct pagevec pvec; + int nr_pages; + pgoff_t index; + pgoff_t end; /* Inclusive */ + long nr_to_write = wbc->nr_to_write; + + pagevec_init(&pvec, 0); + index = wbc->range_start >> PAGE_CACHE_SHIFT; + end = wbc->range_end >> PAGE_CACHE_SHIFT; + + while (!done && (index <= end)) { + int i; + + nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, + PAGECACHE_TAG_DIRTY, + min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); + if (nr_pages == 0) + break; + + for (i = 0; i < nr_pages; i++) { + struct page *page = pvec.pages[i]; + + /* + * At this point, the page may be truncated or + * invalidated (changing page->mapping to NULL), or + * even swizzled back from swapper_space to tmpfs file + * mapping. However, page->index will not change + * because we have a reference on the page. + */ + if (page->index > end) { + done = 1; + break; + } + + lock_page(page); + + /* + * Page truncated or invalidated. We can freely skip it + * then, even for data integrity operations: the page + * has disappeared concurrently, so there could be no + * real expectation of this data interity operation + * even if there is now a new, dirty page at the same + * pagecache address. + */ + if (unlikely(page->mapping != mapping)) { +continue_unlock: + unlock_page(page); + continue; + } + + if (!PageDirty(page)) { + /* someone wrote it for us */ + goto continue_unlock; + } + + if (PageWriteback(page)) { + if (wbc->sync_mode != WB_SYNC_NONE) + wait_on_page_writeback(page); + else + goto continue_unlock; + } + + BUG_ON(PageWriteback(page)); + if (!clear_page_dirty_for_io(page)) + goto continue_unlock; + + ret = __mpage_da_writepage(page, wbc, mpd); + if (unlikely(ret)) { + if (ret == AOP_WRITEPAGE_ACTIVATE) { + unlock_page(page); + ret = 0; + } else { + done = 1; + break; + } + } + + if (nr_to_write > 0) { + nr_to_write--; + if (nr_to_write == 0 && + wbc->sync_mode == WB_SYNC_NONE) { + /* + * We stop writing back only if we are + * not doing integrity sync. In case of + * integrity sync we have to keep going + * because someone may be concurrently + * dirtying pages, and we might have + * synced a lot of newly appeared dirty + * pages, but have not synced all of the + * old dirty pages. + */ + done = 1; + break; + } + } + } + pagevec_release(&pvec); + cond_resched(); + } + return ret; +} + + static int ext4_da_writepages(struct address_space *mapping, struct writeback_control *wbc) { @@ -2836,7 +2913,6 @@ static int ext4_da_writepages(struct address_space *mapping, handle_t *handle = NULL; struct mpage_da_data mpd; struct inode *inode = mapping->host; - int no_nrwrite_index_update; int pages_written = 0; long pages_skipped; unsigned int max_pages; @@ -2916,12 +2992,6 @@ static int ext4_da_writepages(struct address_space *mapping, mpd.wbc = wbc; mpd.inode = mapping->host; - /* - * we don't want write_cache_pages to update - * nr_to_write and writeback_index - */ - no_nrwrite_index_update = wbc->no_nrwrite_index_update; - wbc->no_nrwrite_index_update = 1; pages_skipped = wbc->pages_skipped; retry: @@ -2941,7 +3011,7 @@ retry: if (IS_ERR(handle)) { ret = PTR_ERR(handle); ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " - "%ld pages, ino %lu; err %d\n", __func__, + "%ld pages, ino %lu; err %d", __func__, wbc->nr_to_write, inode->i_ino, ret); goto out_writepages; } @@ -2963,8 +3033,7 @@ retry: mpd.io_done = 0; mpd.pages_written = 0; mpd.retval = 0; - ret = write_cache_pages(mapping, wbc, __mpage_da_writepage, - &mpd); + ret = write_cache_pages_da(mapping, wbc, &mpd); /* * If we have a contiguous extent of pages and we |