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f2fs: preallocate blocks for buffered aio writes

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This patch preallocates data blocks for buffered aio writes.
With this patch, we can avoid redundant locking and unlocking of node pages
given consecutive aio request.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-02-03 13:49:44 -08:00
parent b439b103a6
commit 24b8491251
3 changed files with 32 additions and 8 deletions
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37
fs/f2fs/data.c
View File

@ -571,16 +571,25 @@ ssize_t f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret = 0;
map.m_lblk = F2FS_BYTES_TO_BLK(iocb->ki_pos);
map.m_len = F2FS_BYTES_TO_BLK(iov_iter_count(from));
map.m_len = F2FS_BLK_ALIGN(iov_iter_count(from));
map.m_next_pgofs = NULL;
if (iocb->ki_flags & IOCB_DIRECT &&
!(f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))) {
if (f2fs_encrypted_inode(inode))
return 0;
if (iocb->ki_flags & IOCB_DIRECT) {
ret = f2fs_convert_inline_inode(inode);
if (ret)
return ret;
ret = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
}
if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA) {
ret = f2fs_convert_inline_inode(inode);
if (ret)
return ret;
}
if (!f2fs_has_inline_data(inode))
return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
return ret;
}
@ -612,7 +621,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
/* it only supports block size == page size */
pgofs = (pgoff_t)map->m_lblk;
if (f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
map->m_pblk = ei.blk + pgofs - ei.fofs;
map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
map->m_flags = F2FS_MAP_MAPPED;
@ -647,7 +656,12 @@ next_block:
err = -EIO;
goto sync_out;
}
err = __allocate_data_block(&dn);
if (flag == F2FS_GET_BLOCK_PRE_AIO) {
if (blkaddr == NULL_ADDR)
err = reserve_new_block(&dn);
} else {
err = __allocate_data_block(&dn);
}
if (err)
goto sync_out;
allocated = true;
@ -679,7 +693,8 @@ next_block:
} else if ((map->m_pblk != NEW_ADDR &&
blkaddr == (map->m_pblk + ofs)) ||
(map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
flag == F2FS_GET_BLOCK_PRE_DIO) {
flag == F2FS_GET_BLOCK_PRE_DIO ||
flag == F2FS_GET_BLOCK_PRE_AIO) {
ofs++;
map->m_len++;
} else {
@ -1418,6 +1433,14 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
struct extent_info ei;
int err = 0;
/*
* we already allocated all the blocks, so we don't need to get
* the block addresses when there is no need to fill the page.
*/
if (!f2fs_has_inline_data(inode) && !f2fs_encrypted_inode(inode) &&
len == PAGE_CACHE_SIZE)
return 0;
if (f2fs_has_inline_data(inode) ||
(pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
f2fs_lock_op(sbi);

1
fs/f2fs/f2fs.h
View File

@ -392,6 +392,7 @@ struct f2fs_map_blocks {
#define F2FS_GET_BLOCK_FIEMAP 2
#define F2FS_GET_BLOCK_BMAP 3
#define F2FS_GET_BLOCK_PRE_DIO 4
#define F2FS_GET_BLOCK_PRE_AIO 5
/*
* i_advise uses FADVISE_XXX_BIT. We can add additional hints later.

2
include/linux/f2fs_fs.h
View File

@ -21,7 +21,7 @@
#define F2FS_BLKSIZE 4096 /* support only 4KB block */
#define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */
#define F2FS_MAX_EXTENSION 64 /* # of extension entries */
#define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) / F2FS_BLKSIZE)
#define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
#define NULL_ADDR ((block_t)0) /* used as block_t addresses */
#define NEW_ADDR ((block_t)-1) /* used as block_t addresses */