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>
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index dd50f30..fb8cc27 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1158,10 +1158,11 @@
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 @@
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;
}