ext4: reimplement convert and split_unwritten
Reimplement ext4_ext_convert_to_initialized() and ext4_split_unwritten_extents() using ext4_split_extent() Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Tested-by: Allison Henderson <achender@linux.vnet.ibm.com>
This commit is contained in:
Yongqiang Yang
Theodore Ts'o
Родитель
47ea3bb59c
Коммит
667eff35a1
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@ -2757,17 +2757,13 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
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struct ext4_map_blocks *map,
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struct ext4_ext_path *path)
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{
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struct ext4_extent *ex, newex, orig_ex;
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struct ext4_extent *ex1 = NULL;
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struct ext4_extent *ex2 = NULL;
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struct ext4_extent *ex3 = NULL;
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struct ext4_extent_header *eh;
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struct ext4_map_blocks split_map;
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struct ext4_extent zero_ex;
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struct ext4_extent *ex;
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ext4_lblk_t ee_block, eof_block;
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unsigned int allocated, ee_len, depth;
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ext4_fsblk_t newblock;
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int err = 0;
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int ret = 0;
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int may_zeroout;
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int split_flag = 0;
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ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical"
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"block %llu, max_blocks %u\n", inode->i_ino,
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@ -2779,280 +2775,87 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
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eof_block = map->m_lblk + map->m_len;
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depth = ext_depth(inode);
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eh = path[depth].p_hdr;
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ex = path[depth].p_ext;
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ee_block = le32_to_cpu(ex->ee_block);
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ee_len = ext4_ext_get_actual_len(ex);
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allocated = ee_len - (map->m_lblk - ee_block);
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newblock = map->m_lblk - ee_block + ext4_ext_pblock(ex);
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ex2 = ex;
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orig_ex.ee_block = ex->ee_block;
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orig_ex.ee_len = cpu_to_le16(ee_len);
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ext4_ext_store_pblock(&orig_ex, ext4_ext_pblock(ex));
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WARN_ON(map->m_lblk < ee_block);
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/*
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* It is safe to convert extent to initialized via explicit
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* zeroout only if extent is fully insde i_size or new_size.
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*/
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may_zeroout = ee_block + ee_len <= eof_block;
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split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
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err = ext4_ext_get_access(handle, inode, path + depth);
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if (err)
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goto out;
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/* If extent has less than 2*EXT4_EXT_ZERO_LEN zerout directly */
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if (ee_len <= 2*EXT4_EXT_ZERO_LEN && may_zeroout) {
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err = ext4_ext_zeroout(inode, &orig_ex);
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if (ee_len <= 2*EXT4_EXT_ZERO_LEN &&
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(EXT4_EXT_MAY_ZEROOUT & split_flag)) {
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err = ext4_ext_zeroout(inode, ex);
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if (err)
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goto fix_extent_len;
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/* update the extent length and mark as initialized */
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = orig_ex.ee_len;
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ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
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ext4_ext_dirty(handle, inode, path + depth);
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/* zeroed the full extent */
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return allocated;
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}
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/* ex1: ee_block to map->m_lblk - 1 : uninitialized */
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if (map->m_lblk > ee_block) {
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ex1 = ex;
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ex1->ee_len = cpu_to_le16(map->m_lblk - ee_block);
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ext4_ext_mark_uninitialized(ex1);
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ex2 = &newex;
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}
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/*
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* for sanity, update the length of the ex2 extent before
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* we insert ex3, if ex1 is NULL. This is to avoid temporary
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* overlap of blocks.
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*/
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if (!ex1 && allocated > map->m_len)
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ex2->ee_len = cpu_to_le16(map->m_len);
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/* ex3: to ee_block + ee_len : uninitialised */
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if (allocated > map->m_len) {
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unsigned int newdepth;
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/* If extent has less than EXT4_EXT_ZERO_LEN zerout directly */
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if (allocated <= EXT4_EXT_ZERO_LEN && may_zeroout) {
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/*
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* map->m_lblk == ee_block is handled by the zerouout
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* at the beginning.
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* Mark first half uninitialized.
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* Mark second half initialized and zero out the
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* initialized extent
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*/
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = cpu_to_le16(ee_len - allocated);
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ext4_ext_mark_uninitialized(ex);
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ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
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ext4_ext_dirty(handle, inode, path + depth);
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ex3 = &newex;
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ex3->ee_block = cpu_to_le32(map->m_lblk);
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ext4_ext_store_pblock(ex3, newblock);
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ex3->ee_len = cpu_to_le16(allocated);
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err = ext4_ext_insert_extent(handle, inode, path,
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ex3, 0);
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if (err == -ENOSPC) {
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err = ext4_ext_zeroout(inode, &orig_ex);
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if (err)
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goto fix_extent_len;
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = orig_ex.ee_len;
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ext4_ext_store_pblock(ex,
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ext4_ext_pblock(&orig_ex));
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ext4_ext_dirty(handle, inode, path + depth);
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/* blocks available from map->m_lblk */
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return allocated;
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} else if (err)
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goto fix_extent_len;
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/*
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* We need to zero out the second half because
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* an fallocate request can update file size and
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* converting the second half to initialized extent
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* implies that we can leak some junk data to user
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* space.
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*/
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err = ext4_ext_zeroout(inode, ex3);
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if (err) {
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/*
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* We should actually mark the
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* second half as uninit and return error
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* Insert would have changed the extent
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*/
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depth = ext_depth(inode);
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ext4_ext_drop_refs(path);
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path = ext4_ext_find_extent(inode, map->m_lblk,
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path);
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if (IS_ERR(path)) {
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err = PTR_ERR(path);
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return err;
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}
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/* get the second half extent details */
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ex = path[depth].p_ext;
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err = ext4_ext_get_access(handle, inode,
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path + depth);
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if (err)
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return err;
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ext4_ext_mark_uninitialized(ex);
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ext4_ext_dirty(handle, inode, path + depth);
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return err;
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}
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/* zeroed the second half */
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return allocated;
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}
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ex3 = &newex;
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ex3->ee_block = cpu_to_le32(map->m_lblk + map->m_len);
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ext4_ext_store_pblock(ex3, newblock + map->m_len);
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ex3->ee_len = cpu_to_le16(allocated - map->m_len);
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ext4_ext_mark_uninitialized(ex3);
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err = ext4_ext_insert_extent(handle, inode, path, ex3, 0);
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if (err == -ENOSPC && may_zeroout) {
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err = ext4_ext_zeroout(inode, &orig_ex);
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if (err)
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goto fix_extent_len;
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/* update the extent length and mark as initialized */
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = orig_ex.ee_len;
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ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
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ext4_ext_dirty(handle, inode, path + depth);
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/* zeroed the full extent */
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/* blocks available from map->m_lblk */
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return allocated;
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} else if (err)
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goto fix_extent_len;
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/*
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* The depth, and hence eh & ex might change
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* as part of the insert above.
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*/
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newdepth = ext_depth(inode);
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/*
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* update the extent length after successful insert of the
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* split extent
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*/
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ee_len -= ext4_ext_get_actual_len(ex3);
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orig_ex.ee_len = cpu_to_le16(ee_len);
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may_zeroout = ee_block + ee_len <= eof_block;
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depth = newdepth;
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ext4_ext_drop_refs(path);
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path = ext4_ext_find_extent(inode, map->m_lblk, path);
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if (IS_ERR(path)) {
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err = PTR_ERR(path);
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goto out;
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}
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eh = path[depth].p_hdr;
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ex = path[depth].p_ext;
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if (ex2 != &newex)
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ex2 = ex;
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err = ext4_ext_get_access(handle, inode, path + depth);
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if (err)
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goto out;
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allocated = map->m_len;
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/* If extent has less than EXT4_EXT_ZERO_LEN and we are trying
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* to insert a extent in the middle zerout directly
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* otherwise give the extent a chance to merge to left
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*/
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if (le16_to_cpu(orig_ex.ee_len) <= EXT4_EXT_ZERO_LEN &&
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map->m_lblk != ee_block && may_zeroout) {
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err = ext4_ext_zeroout(inode, &orig_ex);
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if (err)
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goto fix_extent_len;
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/* update the extent length and mark as initialized */
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = orig_ex.ee_len;
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ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
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ext4_ext_dirty(handle, inode, path + depth);
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/* zero out the first half */
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/* blocks available from map->m_lblk */
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return allocated;
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}
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ext4_ext_mark_initialized(ex);
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ext4_ext_try_to_merge(inode, path, ex);
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err = ext4_ext_dirty(handle, inode, path + depth);
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goto out;
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}
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/*
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* If there was a change of depth as part of the
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* insertion of ex3 above, we need to update the length
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* of the ex1 extent again here
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* four cases:
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* 1. split the extent into three extents.
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* 2. split the extent into two extents, zeroout the first half.
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* 3. split the extent into two extents, zeroout the second half.
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* 4. split the extent into two extents with out zeroout.
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*/
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if (ex1 && ex1 != ex) {
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ex1 = ex;
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ex1->ee_len = cpu_to_le16(map->m_lblk - ee_block);
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ext4_ext_mark_uninitialized(ex1);
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ex2 = &newex;
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}
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/* ex2: map->m_lblk to map->m_lblk + maxblocks-1 : initialised */
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ex2->ee_block = cpu_to_le32(map->m_lblk);
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ext4_ext_store_pblock(ex2, newblock);
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ex2->ee_len = cpu_to_le16(allocated);
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if (ex2 != ex)
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goto insert;
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/*
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* New (initialized) extent starts from the first block
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* in the current extent. i.e., ex2 == ex
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* We have to see if it can be merged with the extent
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* on the left.
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*/
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if (ex2 > EXT_FIRST_EXTENT(eh)) {
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/*
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* To merge left, pass "ex2 - 1" to try_to_merge(),
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* since it merges towards right _only_.
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*/
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ret = ext4_ext_try_to_merge(inode, path, ex2 - 1);
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if (ret) {
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err = ext4_ext_correct_indexes(handle, inode, path);
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split_map.m_lblk = map->m_lblk;
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split_map.m_len = map->m_len;
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if (allocated > map->m_len) {
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if (allocated <= EXT4_EXT_ZERO_LEN &&
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(EXT4_EXT_MAY_ZEROOUT & split_flag)) {
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/* case 3 */
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zero_ex.ee_block =
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cpu_to_le32(map->m_lblk + map->m_len);
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zero_ex.ee_len = cpu_to_le16(allocated - map->m_len);
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ext4_ext_store_pblock(&zero_ex,
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ext4_ext_pblock(ex) + map->m_lblk - ee_block);
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err = ext4_ext_zeroout(inode, &zero_ex);
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if (err)
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goto out;
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depth = ext_depth(inode);
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ex2--;
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split_map.m_lblk = map->m_lblk;
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split_map.m_len = allocated;
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} else if ((map->m_lblk - ee_block + map->m_len <
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EXT4_EXT_ZERO_LEN) &&
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(EXT4_EXT_MAY_ZEROOUT & split_flag)) {
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/* case 2 */
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if (map->m_lblk != ee_block) {
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zero_ex.ee_block = ex->ee_block;
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zero_ex.ee_len = cpu_to_le16(map->m_lblk -
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ee_block);
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ext4_ext_store_pblock(&zero_ex,
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ext4_ext_pblock(ex));
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err = ext4_ext_zeroout(inode, &zero_ex);
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if (err)
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goto out;
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}
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allocated = map->m_lblk - ee_block + map->m_len;
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split_map.m_lblk = ee_block;
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split_map.m_len = allocated;
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}
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}
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/*
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* Try to Merge towards right. This might be required
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* only when the whole extent is being written to.
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* i.e. ex2 == ex and ex3 == NULL.
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*/
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if (!ex3) {
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ret = ext4_ext_try_to_merge(inode, path, ex2);
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if (ret) {
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err = ext4_ext_correct_indexes(handle, inode, path);
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if (err)
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goto out;
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}
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}
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/* Mark modified extent as dirty */
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err = ext4_ext_dirty(handle, inode, path + depth);
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goto out;
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insert:
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err = ext4_ext_insert_extent(handle, inode, path, &newex, 0);
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if (err == -ENOSPC && may_zeroout) {
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err = ext4_ext_zeroout(inode, &orig_ex);
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if (err)
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goto fix_extent_len;
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/* update the extent length and mark as initialized */
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = orig_ex.ee_len;
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ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
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ext4_ext_dirty(handle, inode, path + depth);
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/* zero out the first half */
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return allocated;
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} else if (err)
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goto fix_extent_len;
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allocated = ext4_split_extent(handle, inode, path,
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&split_map, split_flag, 0);
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if (allocated < 0)
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err = allocated;
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out:
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ext4_ext_show_leaf(inode, path);
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return err ? err : allocated;
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fix_extent_len:
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ex->ee_block = orig_ex.ee_block;
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ex->ee_len = orig_ex.ee_len;
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ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
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ext4_ext_mark_uninitialized(ex);
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ext4_ext_dirty(handle, inode, path + depth);
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return err;
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}
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/*
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||||
|
|
@ -3083,15 +2886,11 @@ static int ext4_split_unwritten_extents(handle_t *handle,
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struct ext4_ext_path *path,
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int flags)
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||||
{
|
||||
struct ext4_extent *ex, newex, orig_ex;
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struct ext4_extent *ex1 = NULL;
|
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struct ext4_extent *ex2 = NULL;
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struct ext4_extent *ex3 = NULL;
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ext4_lblk_t ee_block, eof_block;
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unsigned int allocated, ee_len, depth;
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ext4_fsblk_t newblock;
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int err = 0;
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||||
int may_zeroout;
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||||
ext4_lblk_t eof_block;
|
||||
ext4_lblk_t ee_block;
|
||||
struct ext4_extent *ex;
|
||||
unsigned int ee_len;
|
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int split_flag = 0, depth;
|
||||
|
||||
ext_debug("ext4_split_unwritten_extents: inode %lu, logical"
|
||||
"block %llu, max_blocks %u\n", inode->i_ino,
|
||||
|
|
@ -3101,155 +2900,20 @@ static int ext4_split_unwritten_extents(handle_t *handle,
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inode->i_sb->s_blocksize_bits;
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||||
if (eof_block < map->m_lblk + map->m_len)
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||||
eof_block = map->m_lblk + map->m_len;
|
||||
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||||
depth = ext_depth(inode);
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||||
ex = path[depth].p_ext;
|
||||
ee_block = le32_to_cpu(ex->ee_block);
|
||||
ee_len = ext4_ext_get_actual_len(ex);
|
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allocated = ee_len - (map->m_lblk - ee_block);
|
||||
newblock = map->m_lblk - ee_block + ext4_ext_pblock(ex);
|
||||
|
||||
ex2 = ex;
|
||||
orig_ex.ee_block = ex->ee_block;
|
||||
orig_ex.ee_len = cpu_to_le16(ee_len);
|
||||
ext4_ext_store_pblock(&orig_ex, ext4_ext_pblock(ex));
|
||||
|
||||
/*
|
||||
* It is safe to convert extent to initialized via explicit
|
||||
* zeroout only if extent is fully insde i_size or new_size.
|
||||
*/
|
||||
may_zeroout = ee_block + ee_len <= eof_block;
|
||||
depth = ext_depth(inode);
|
||||
ex = path[depth].p_ext;
|
||||
ee_block = le32_to_cpu(ex->ee_block);
|
||||
ee_len = ext4_ext_get_actual_len(ex);
|
||||
|
||||
/*
|
||||
* If the uninitialized extent begins at the same logical
|
||||
* block where the write begins, and the write completely
|
||||
* covers the extent, then we don't need to split it.
|
||||
*/
|
||||
if ((map->m_lblk == ee_block) && (allocated <= map->m_len))
|
||||
return allocated;
|
||||
split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
|
||||
split_flag |= EXT4_EXT_MARK_UNINIT2;
|
||||
|
||||
err = ext4_ext_get_access(handle, inode, path + depth);
|
||||
if (err)
|
||||
goto out;
|
||||
/* ex1: ee_block to map->m_lblk - 1 : uninitialized */
|
||||
if (map->m_lblk > ee_block) {
|
||||
ex1 = ex;
|
||||
ex1->ee_len = cpu_to_le16(map->m_lblk - ee_block);
|
||||
ext4_ext_mark_uninitialized(ex1);
|
||||
ex2 = &newex;
|
||||
}
|
||||
/*
|
||||
* for sanity, update the length of the ex2 extent before
|
||||
* we insert ex3, if ex1 is NULL. This is to avoid temporary
|
||||
* overlap of blocks.
|
||||
*/
|
||||
if (!ex1 && allocated > map->m_len)
|
||||
ex2->ee_len = cpu_to_le16(map->m_len);
|
||||
/* ex3: to ee_block + ee_len : uninitialised */
|
||||
if (allocated > map->m_len) {
|
||||
unsigned int newdepth;
|
||||
ex3 = &newex;
|
||||
ex3->ee_block = cpu_to_le32(map->m_lblk + map->m_len);
|
||||
ext4_ext_store_pblock(ex3, newblock + map->m_len);
|
||||
ex3->ee_len = cpu_to_le16(allocated - map->m_len);
|
||||
ext4_ext_mark_uninitialized(ex3);
|
||||
err = ext4_ext_insert_extent(handle, inode, path, ex3, flags);
|
||||
if (err == -ENOSPC && may_zeroout) {
|
||||
err = ext4_ext_zeroout(inode, &orig_ex);
|
||||
if (err)
|
||||
goto fix_extent_len;
|
||||
/* update the extent length and mark as initialized */
|
||||
ex->ee_block = orig_ex.ee_block;
|
||||
ex->ee_len = orig_ex.ee_len;
|
||||
ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
|
||||
ext4_ext_dirty(handle, inode, path + depth);
|
||||
/* zeroed the full extent */
|
||||
/* blocks available from map->m_lblk */
|
||||
return allocated;
|
||||
|
||||
} else if (err)
|
||||
goto fix_extent_len;
|
||||
/*
|
||||
* The depth, and hence eh & ex might change
|
||||
* as part of the insert above.
|
||||
*/
|
||||
newdepth = ext_depth(inode);
|
||||
/*
|
||||
* update the extent length after successful insert of the
|
||||
* split extent
|
||||
*/
|
||||
ee_len -= ext4_ext_get_actual_len(ex3);
|
||||
orig_ex.ee_len = cpu_to_le16(ee_len);
|
||||
may_zeroout = ee_block + ee_len <= eof_block;
|
||||
|
||||
depth = newdepth;
|
||||
ext4_ext_drop_refs(path);
|
||||
path = ext4_ext_find_extent(inode, map->m_lblk, path);
|
||||
if (IS_ERR(path)) {
|
||||
err = PTR_ERR(path);
|
||||
goto out;
|
||||
}
|
||||
ex = path[depth].p_ext;
|
||||
if (ex2 != &newex)
|
||||
ex2 = ex;
|
||||
|
||||
err = ext4_ext_get_access(handle, inode, path + depth);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
allocated = map->m_len;
|
||||
}
|
||||
/*
|
||||
* If there was a change of depth as part of the
|
||||
* insertion of ex3 above, we need to update the length
|
||||
* of the ex1 extent again here
|
||||
*/
|
||||
if (ex1 && ex1 != ex) {
|
||||
ex1 = ex;
|
||||
ex1->ee_len = cpu_to_le16(map->m_lblk - ee_block);
|
||||
ext4_ext_mark_uninitialized(ex1);
|
||||
ex2 = &newex;
|
||||
}
|
||||
/*
|
||||
* ex2: map->m_lblk to map->m_lblk + map->m_len-1 : to be written
|
||||
* using direct I/O, uninitialised still.
|
||||
*/
|
||||
ex2->ee_block = cpu_to_le32(map->m_lblk);
|
||||
ext4_ext_store_pblock(ex2, newblock);
|
||||
ex2->ee_len = cpu_to_le16(allocated);
|
||||
ext4_ext_mark_uninitialized(ex2);
|
||||
if (ex2 != ex)
|
||||
goto insert;
|
||||
/* Mark modified extent as dirty */
|
||||
err = ext4_ext_dirty(handle, inode, path + depth);
|
||||
ext_debug("out here\n");
|
||||
goto out;
|
||||
insert:
|
||||
err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
|
||||
if (err == -ENOSPC && may_zeroout) {
|
||||
err = ext4_ext_zeroout(inode, &orig_ex);
|
||||
if (err)
|
||||
goto fix_extent_len;
|
||||
/* update the extent length and mark as initialized */
|
||||
ex->ee_block = orig_ex.ee_block;
|
||||
ex->ee_len = orig_ex.ee_len;
|
||||
ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
|
||||
ext4_ext_dirty(handle, inode, path + depth);
|
||||
/* zero out the first half */
|
||||
return allocated;
|
||||
} else if (err)
|
||||
goto fix_extent_len;
|
||||
out:
|
||||
ext4_ext_show_leaf(inode, path);
|
||||
return err ? err : allocated;
|
||||
|
||||
fix_extent_len:
|
||||
ex->ee_block = orig_ex.ee_block;
|
||||
ex->ee_len = orig_ex.ee_len;
|
||||
ext4_ext_store_pblock(ex, ext4_ext_pblock(&orig_ex));
|
||||
ext4_ext_mark_uninitialized(ex);
|
||||
ext4_ext_dirty(handle, inode, path + depth);
|
||||
return err;
|
||||
flags |= EXT4_GET_BLOCKS_PRE_IO;
|
||||
return ext4_split_extent(handle, inode, path, map, split_flag, flags);
|
||||
}
|
||||
|
||||
static int ext4_convert_unwritten_extents_endio(handle_t *handle,
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче