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authorDongho Sim <dh.sim@samsung.com>2014-07-30 08:52:41 +0200
committerJaegeuk Kim <jaegeuk@kernel.org>2014-07-31 00:38:59 +0200
commit33be828ada7274ebcade2001f16e5b4e33a4636e (patch)
tree52cd85e9e0f6eb23c68ab6a75ad904603381c19d /fs/f2fs
parentf2fs: add tracepoint for f2fs_issue_flush (diff)
downloadlinux-33be828ada7274ebcade2001f16e5b4e33a4636e.tar.xz
linux-33be828ada7274ebcade2001f16e5b4e33a4636e.zip
f2fs: remove redundant lines in allocate_data_block
There are redundant lines in allocate_data_block. In this function, we call refresh_sit_entry with old seg and old curseg. After that, we call locate_dirty_segment with old curseg. But, the new address is always allocated from old curseg and we call locate_dirty_segment with old curseg in refresh_sit_entry. So, we do not need to call locate_dirty_segment with old curseg again. We've discussed like below: Jaegeuk said: "When considering SSR, we need to take care of the following scenario. - old segno : X - new address : Z - old curseg : Y This means, a new block is supposed to be written to Z from X. And Z is newly allocated in the same path from Y. In that case, we should trigger locate_dirty_segment for Y, since it was a current_segment and can be dirty owing to SSR. But that was not included in the dirty list." Changman said: "We already choosed old curseg(Y) and then we allocate new address(Z) from old curseg(Y). After that we call refresh_sit_entry(old address, new address). In the funcation, we call locate_dirty_segment with old seg and old curseg. So calling locate_dirty_segment after refresh_sit_entry again is redundant." Jaegeuk said: "Right. The new address is always allocated from old_curseg." Reviewed-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Dongho Sim <dh.sim@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/segment.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 5a53a0ac6e4f..c3b76d091450 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -976,14 +976,12 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
{
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg;
- unsigned int old_cursegno;
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
*new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
- old_cursegno = curseg->segno;
/*
* __add_sum_entry should be resided under the curseg_mutex
@@ -1004,7 +1002,6 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
* since SSR needs latest valid block information.
*/
refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
- locate_dirty_segment(sbi, old_cursegno);
mutex_unlock(&sit_i->sentry_lock);