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Commit a9b82415 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Theodore Ts'o
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ext4: merge uninitialized extents 



Allow for merging uninitialized extents.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent e251f9bc

fs/ext4/extents.c

+17 −4
Original line number Diff line number Diff line
@@ -1691,7 +1691,7 @@ ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, 
	 * the extent that was written properly split out and conversion to

	 * initialized is trivial.

	 */

	if (ext4_ext_is_uninitialized(ex1) || ext4_ext_is_uninitialized(ex2))

	if (ext4_ext_is_uninitialized(ex1) != ext4_ext_is_uninitialized(ex2))

		return 0;



	ext1_ee_len = ext4_ext_get_actual_len(ex1);
@@ -1708,6 +1708,11 @@ ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, 
	 */

	if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN)

		return 0;

	if (ext4_ext_is_uninitialized(ex1) &&

	    (ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN) ||

	     atomic_read(&EXT4_I(inode)->i_unwritten) ||

	     (ext1_ee_len + ext2_ee_len > EXT_UNINIT_MAX_LEN)))

		return 0;

#ifdef AGGRESSIVE_TEST

	if (ext1_ee_len >= 4)

		return 0;
@@ -1731,7 +1736,7 @@ static int ext4_ext_try_to_merge_right(struct inode *inode, 
{

	struct ext4_extent_header *eh;

	unsigned int depth, len;

	int merge_done = 0;

	int merge_done = 0, uninit;



	depth = ext_depth(inode);

	BUG_ON(path[depth].p_hdr == NULL);
@@ -1741,8 +1746,11 @@ static int ext4_ext_try_to_merge_right(struct inode *inode, 
		if (!ext4_can_extents_be_merged(inode, ex, ex + 1))

			break;

		/* merge with next extent! */

		uninit = ext4_ext_is_uninitialized(ex);

		ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)

				+ ext4_ext_get_actual_len(ex + 1));

		if (uninit)

			ext4_ext_mark_uninitialized(ex);



		if (ex + 1 < EXT_LAST_EXTENT(eh)) {

			len = (EXT_LAST_EXTENT(eh) - ex - 1)
@@ -1896,7 +1904,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, 
	struct ext4_ext_path *npath = NULL;

	int depth, len, err;

	ext4_lblk_t next;

	int mb_flags = 0;

	int mb_flags = 0, uninit;



	if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {

		EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
@@ -1946,9 +1954,11 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, 
						  path + depth);

			if (err)

				return err;



			uninit = ext4_ext_is_uninitialized(ex);

			ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)

					+ ext4_ext_get_actual_len(newext));

			if (uninit)

				ext4_ext_mark_uninitialized(ex);

			eh = path[depth].p_hdr;

			nearex = ex;

			goto merge;
@@ -1971,10 +1981,13 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, 
			if (err)

				return err;



			uninit = ext4_ext_is_uninitialized(ex);

			ex->ee_block = newext->ee_block;

			ext4_ext_store_pblock(ex, ext4_ext_pblock(newext));

			ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)

					+ ext4_ext_get_actual_len(newext));

			if (uninit)

				ext4_ext_mark_uninitialized(ex);

			eh = path[depth].p_hdr;

			nearex = ex;

			goto merge;