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f2fs: fallocate data blocks in single locked node page 

This patch is to improve the expand_inode speed in fallocate by allocating
data blocks as many as possible in single locked node page.

In SSD,
 # time fallocate -l 500G $MNT/testfile

Before : 1m 33.410 s
After  : 24.758 s

Reported-by: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-05-06 15:30:38 -07:00
parent f61cce5b81
commit e12dd7bd87
1 changed files with 22 additions and 29 deletions
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51
fs/f2fs/file.c
View File

@ -1158,10 +1158,11 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
loff_t len, int mode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
pgoff_t index, pg_start, pg_end;
struct f2fs_map_blocks map = { .m_next_pgofs = NULL };
pgoff_t pg_end;
loff_t new_size = i_size_read(inode);
loff_t off_start, off_end;
int ret = 0;
loff_t off_end;
int ret;
ret = inode_newsize_ok(inode, (len + offset));
if (ret)
@ -1173,43 +1174,35 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
f2fs_balance_fs(sbi, true);
pg_start = ((unsigned long long) offset) >> PAGE_SHIFT;
pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT;
off_start = offset & (PAGE_SIZE - 1);
pg_end = ((unsigned long long)offset + len) >> PAGE_SHIFT;
off_end = (offset + len) & (PAGE_SIZE - 1);
f2fs_lock_op(sbi);
map.m_lblk = ((unsigned long long)offset) >> PAGE_SHIFT;
map.m_len = pg_end - map.m_lblk;
if (off_end)
map.m_len++;
for (index = pg_start; index <= pg_end; index++) {
struct dnode_of_data dn;
ret = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
if (ret) {
pgoff_t last_off;
if (index == pg_end && !off_end)
goto noalloc;
if (!map.m_len)
return ret;
set_new_dnode(&dn, inode, NULL, NULL, 0);
ret = f2fs_reserve_block(&dn, index);
if (ret)
break;
noalloc:
if (pg_start == pg_end)
new_size = offset + len;
else if (index == pg_start && off_start)
new_size = (loff_t)(index + 1) << PAGE_SHIFT;
else if (index == pg_end)
new_size = ((loff_t)index << PAGE_SHIFT) +
off_end;
else
new_size += PAGE_SIZE;
last_off = map.m_lblk + map.m_len - 1;
/* update new size to the failed position */
new_size = (last_off == pg_end) ? offset + len:
(loff_t)(last_off + 1) << PAGE_SHIFT;
} else {
new_size = ((loff_t)pg_end << PAGE_SHIFT) + off_end;
}
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
i_size_read(inode) < new_size) {
if (!(mode & FALLOC_FL_KEEP_SIZE) && i_size_read(inode) < new_size) {
i_size_write(inode, new_size);
mark_inode_dirty(inode);
update_inode_page(inode);
}
f2fs_unlock_op(sbi);
return ret;
}