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Message-ID: <20160908001855.GB14665@jaegeuk>
Date: Wed, 7 Sep 2016 17:18:55 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: check free_sections for defragmentation
On Wed, Sep 07, 2016 at 09:35:30PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
>
> On 2016/9/2 4:46, Jaegeuk Kim wrote:
> > Fix wrong condition check for defragmentation of a file.
> >
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> > fs/f2fs/file.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 37c24be..a8aa6fd 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -2037,7 +2037,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
> > * avoid defragment running in SSR mode when free section are allocated
> > * intensively
> > */
> > - if (has_not_enough_free_secs(sbi, sec_num)) {
> > + if (free_sections(sbi) <= sec_num) {
>
> Why don't we check dirty dentry/node/imeta blocks here? they will be generated
> at any time after f2fs_balance_fs. So, isn't original condition more strict than
> new one?
I just wanted to fix this without any multiple changes.
We can do like this as well. :)
>From 6526f0377fd6616ae65b854fbd614e8ed9598fdd Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@...nel.org>
Date: Thu, 1 Sep 2016 12:02:51 -0700
Subject: [PATCH] f2fs: check free_sections for defragmentation
Fix wrong condition check for defragmentation of a file.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/data.c | 4 ++--
fs/f2fs/file.c | 2 +-
fs/f2fs/gc.c | 10 +++++-----
fs/f2fs/segment.c | 6 +++---
fs/f2fs/segment.h | 7 ++++---
5 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9bfca4b..3e0ef2d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1298,7 +1298,7 @@ write:
if (!wbc->for_reclaim)
need_balance_fs = true;
- else if (has_not_enough_free_secs(sbi, 0))
+ else if (has_not_enough_free_secs(sbi, 0, 0))
goto redirty_out;
err = -EAGAIN;
@@ -1630,7 +1630,7 @@ repeat:
if (err)
goto fail;
- if (need_balance && has_not_enough_free_secs(sbi, 0)) {
+ if (need_balance && has_not_enough_free_secs(sbi, 0, 0)) {
unlock_page(page);
f2fs_balance_fs(sbi, true);
lock_page(page);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 47f6193..d5f60ad 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2037,7 +2037,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
* avoid defragment running in SSR mode when free section are allocated
* intensively
*/
- if (has_not_enough_free_secs(sbi, sec_num)) {
+ if (has_not_enough_free_secs(sbi, 0, sec_num)) {
err = -EAGAIN;
goto out;
}
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index cdc44a6..24acbbb 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -439,7 +439,7 @@ next_step:
struct node_info ni;
/* stop BG_GC if there is not enough free sections. */
- if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
return;
if (check_valid_map(sbi, segno, off) == 0)
@@ -715,7 +715,7 @@ next_step:
nid_t nid = le32_to_cpu(entry->nid);
/* stop BG_GC if there is not enough free sections. */
- if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
return;
if (check_valid_map(sbi, segno, off) == 0)
@@ -916,7 +916,7 @@ gc_more:
goto stop;
}
- if (gc_type == BG_GC && has_not_enough_free_secs(sbi, sec_freed)) {
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, sec_freed, 0)) {
gc_type = FG_GC;
/*
* If there is no victim and no prefree segment but still not
@@ -927,7 +927,7 @@ gc_more:
prefree_segments(sbi)) {
write_checkpoint(sbi, &cpc);
segno = NULL_SEGNO;
- } else if (has_not_enough_free_secs(sbi, 0)) {
+ } else if (has_not_enough_free_secs(sbi, 0, 0)) {
write_checkpoint(sbi, &cpc);
}
}
@@ -944,7 +944,7 @@ gc_more:
sbi->cur_victim_sec = NULL_SEGNO;
if (!sync) {
- if (has_not_enough_free_secs(sbi, sec_freed))
+ if (has_not_enough_free_secs(sbi, sec_freed, 0))
goto gc_more;
if (gc_type == FG_GC)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3ff4621..101b58f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -356,7 +356,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
* We should do GC or end up with checkpoint, if there are so many dirty
* dir/node pages without enough free segments.
*/
- if (has_not_enough_free_secs(sbi, 0)) {
+ if (has_not_enough_free_secs(sbi, 0, 0)) {
mutex_lock(&sbi->gc_mutex);
f2fs_gc(sbi, false);
}
@@ -1278,7 +1278,7 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
struct curseg_info *curseg = CURSEG_I(sbi, type);
const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
- if (IS_NODESEG(type) || !has_not_enough_free_secs(sbi, 0))
+ if (IS_NODESEG(type) || !has_not_enough_free_secs(sbi, 0, 0))
return v_ops->get_victim(sbi,
&(curseg)->next_segno, BG_GC, type, SSR);
@@ -1477,7 +1477,7 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
/* direct_io'ed data is aligned to the segment for better performance */
if (direct_io && curseg->next_blkoff &&
- !has_not_enough_free_secs(sbi, 0))
+ !has_not_enough_free_secs(sbi, 0, 0))
__allocate_new_segments(sbi, type);
*new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 87156c7..fecb856 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -479,7 +479,8 @@ static inline bool need_SSR(struct f2fs_sb_info *sbi)
reserved_sections(sbi) + 1);
}
-static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
+static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi,
+ int freed, int needed)
{
int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
@@ -489,8 +490,8 @@ static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
return false;
- return (free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +
- reserved_sections(sbi));
+ return (free_sections(sbi) + freed) <=
+ (node_secs + 2 * dent_secs + reserved_sections(sbi) + needed);
}
static inline bool excess_prefree_segs(struct f2fs_sb_info *sbi)
--
2.8.3
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