Commit da85985c authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: speed up handling holes in fiemap 



This patch makes f2fs_map_blocks supporting returning next potential
page offset which skips hole region in indirect tree of inode, and
use it to speed up fiemap in handling big hole case.

Test method:
xfs_io -f /mnt/f2fs/file  -c "pwrite 1099511627776 4096"
time xfs_io -f /mnt/f2fs/file -c "fiemap -v"

Before:
time xfs_io -f /mnt/f2fs/file -c "fiemap -v"
/mnt/f2fs/file:
 EXT: FILE-OFFSET              BLOCK-RANGE      TOTAL FLAGS
   0: [0..2147483647]:         hole             2147483648
   1: [2147483648..2147483655]: 81920..81927         8   0x1

real    3m3.518s
user    0m0.000s
sys     3m3.456s

After:
time xfs_io -f /mnt/f2fs/file -c "fiemap -v"
/mnt/f2fs/file:
 EXT: FILE-OFFSET              BLOCK-RANGE      TOTAL FLAGS
   0: [0..2147483647]:         hole             2147483648
   1: [2147483648..2147483655]: 81920..81927         8   0x1

real    0m0.008s
user    0m0.000s
sys     0m0.008s

Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 3cf45747

fs/f2fs/data.c

+26 −9
Original line number Diff line number Diff line
@@ -539,6 +539,7 @@ static int __allocate_data_blocks(struct inode *inode, loff_t offset, 


	map.m_lblk = F2FS_BYTES_TO_BLK(offset);

	map.m_len = F2FS_BYTES_TO_BLK(count);

	map.m_next_pgofs = NULL;



	return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_DIO);

}
@@ -586,8 +587,12 @@ next_dnode: 
	set_new_dnode(&dn, inode, NULL, NULL, 0);

	err = get_dnode_of_data(&dn, pgofs, mode);

	if (err) {

		if (err == -ENOENT)

		if (err == -ENOENT) {

			err = 0;

			if (map->m_next_pgofs)

				*map->m_next_pgofs =

					get_next_page_offset(&dn, pgofs);

		}

		goto unlock_out;

	}
@@ -609,6 +614,11 @@ next_block: 
			map->m_flags = F2FS_MAP_NEW;

			blkaddr = dn.data_blkaddr;

		} else {

			if (flag == F2FS_GET_BLOCK_FIEMAP &&

						blkaddr == NULL_ADDR) {

				if (map->m_next_pgofs)

					*map->m_next_pgofs = pgofs + 1;

			}

			if (flag != F2FS_GET_BLOCK_FIEMAP ||

						blkaddr != NEW_ADDR) {

				if (flag == F2FS_GET_BLOCK_BMAP)
@@ -669,13 +679,15 @@ out: 
}



static int __get_data_block(struct inode *inode, sector_t iblock,

			struct buffer_head *bh, int create, int flag)

			struct buffer_head *bh, int create, int flag,

			pgoff_t *next_pgofs)

{

	struct f2fs_map_blocks map;

	int ret;



	map.m_lblk = iblock;

	map.m_len = bh->b_size >> inode->i_blkbits;

	map.m_next_pgofs = next_pgofs;



	ret = f2fs_map_blocks(inode, &map, create, flag);

	if (!ret) {
@@ -687,16 +699,18 @@ static int __get_data_block(struct inode *inode, sector_t iblock, 
}



static int get_data_block(struct inode *inode, sector_t iblock,

			struct buffer_head *bh_result, int create, int flag)

			struct buffer_head *bh_result, int create, int flag,

			pgoff_t *next_pgofs)

{

	return __get_data_block(inode, iblock, bh_result, create, flag);

	return __get_data_block(inode, iblock, bh_result, create,

							flag, next_pgofs);

}



static int get_data_block_dio(struct inode *inode, sector_t iblock,

			struct buffer_head *bh_result, int create)

{

	return __get_data_block(inode, iblock, bh_result, create,

						F2FS_GET_BLOCK_DIO);

						F2FS_GET_BLOCK_DIO, NULL);

}



static int get_data_block_bmap(struct inode *inode, sector_t iblock,
@@ -707,7 +721,7 @@ static int get_data_block_bmap(struct inode *inode, sector_t iblock, 
		return -EFBIG;



	return __get_data_block(inode, iblock, bh_result, create,

						F2FS_GET_BLOCK_BMAP);

						F2FS_GET_BLOCK_BMAP, NULL);

}



static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
@@ -725,6 +739,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 
{

	struct buffer_head map_bh;

	sector_t start_blk, last_blk;

	pgoff_t next_pgofs;

	loff_t isize;

	u64 logical = 0, phys = 0, size = 0;

	u32 flags = 0;
@@ -760,14 +775,15 @@ next: 
	map_bh.b_size = len;



	ret = get_data_block(inode, start_blk, &map_bh, 0,

					F2FS_GET_BLOCK_FIEMAP);

					F2FS_GET_BLOCK_FIEMAP, &next_pgofs);

	if (ret)

		goto out;



	/* HOLE */

	if (!buffer_mapped(&map_bh)) {

		start_blk = next_pgofs;

		/* Go through holes util pass the EOF */

		if (blk_to_logical(inode, start_blk++) < isize)

		if (blk_to_logical(inode, start_blk) < isize)

			goto prep_next;

		/* Found a hole beyond isize means no more extents.

		 * Note that the premise is that filesystems don't
@@ -835,6 +851,7 @@ static int f2fs_mpage_readpages(struct address_space *mapping, 
	map.m_lblk = 0;

	map.m_len = 0;

	map.m_flags = 0;

	map.m_next_pgofs = NULL;



	for (page_idx = 0; nr_pages; page_idx++, nr_pages--) {

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -383,6 +383,7 @@ struct f2fs_map_blocks { 
	block_t m_lblk;

	unsigned int m_len;

	unsigned int m_flags;

	pgoff_t *m_next_pgofs;		/* point next possible non-hole pgofs */

};



/* for flag in get_data_block */

fs/f2fs/file.c

+1 −1
Original line number Diff line number Diff line
@@ -1647,7 +1647,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi, 
					struct f2fs_defragment *range)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_map_blocks map;

	struct f2fs_map_blocks map = { .m_next_pgofs = NULL };

	struct extent_info ei;

	pgoff_t pg_start, pg_end;

	unsigned int blk_per_seg = sbi->blocks_per_seg;

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