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f2fs: retry gc if one section is not successfully reclaimed 

If FG_GC failed to reclaim one section, let's retry with another section
from the start, since we can get anoterh good candidate.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-08-15 22:06:08 -07:00
parent 2286c0205d
commit 5ee5293c32
1 changed files with 20 additions and 26 deletions
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46
fs/f2fs/gc.c
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@ -391,7 +391,7 @@ static int check_valid_map(struct f2fs_sb_info *sbi,
* On validity, copy that node with cold status, otherwise (invalid node)
* ignore that.
*/
static void gc_node_segment(struct f2fs_sb_info *sbi,
static int gc_node_segment(struct f2fs_sb_info *sbi,
struct f2fs_summary *sum, unsigned int segno, int gc_type)
{
bool initial = true;
@ -411,7 +411,7 @@ next_step:
/* stop BG_GC if there is not enough free sections. */
if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
return;
return 0;
if (check_valid_map(sbi, segno, off) == 0)
continue;
@ -461,13 +461,11 @@ next_step:
};
sync_node_pages(sbi, 0, &wbc);
/*
* In the case of FG_GC, it'd be better to reclaim this victim
* completely.
*/
if (get_valid_blocks(sbi, segno, 1) != 0)
goto next_step;
/* return 1 only if FG_GC succefully reclaimed one */
if (get_valid_blocks(sbi, segno, 1) == 0)
return 1;
}
return 0;
}
/*
@ -649,7 +647,7 @@ out:
* If the parent node is not valid or the data block address is different,
* the victim data block is ignored.
*/
static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
struct gc_inode_list *gc_list, unsigned int segno, int gc_type)
{
struct super_block *sb = sbi->sb;
@ -672,7 +670,7 @@ next_step:
/* stop BG_GC if there is not enough free sections. */
if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
return;
return 0;
if (check_valid_map(sbi, segno, off) == 0)
continue;
@ -737,15 +735,11 @@ next_step:
if (gc_type == FG_GC) {
f2fs_submit_merged_bio(sbi, DATA, WRITE);
/*
* In the case of FG_GC, it'd be better to reclaim this victim
* completely.
*/
if (get_valid_blocks(sbi, segno, 1) != 0) {
phase = 2;
goto next_step;
}
/* return 1 only if FG_GC succefully reclaimed one */
if (get_valid_blocks(sbi, segno, 1) == 0)
return 1;
}
return 0;
}
static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
@ -761,12 +755,13 @@ static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
return ret;
}
static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
static int do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
struct gc_inode_list *gc_list, int gc_type)
{
struct page *sum_page;
struct f2fs_summary_block *sum;
struct blk_plug plug;
int nfree = 0;
/* read segment summary of victim */
sum_page = get_sum_page(sbi, segno);
@ -786,10 +781,11 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
switch (GET_SUM_TYPE((&sum->footer))) {
case SUM_TYPE_NODE:
gc_node_segment(sbi, sum->entries, segno, gc_type);
nfree = gc_node_segment(sbi, sum->entries, segno, gc_type);
break;
case SUM_TYPE_DATA:
gc_data_segment(sbi, sum->entries, gc_list, segno, gc_type);
nfree = gc_data_segment(sbi, sum->entries, gc_list,
segno, gc_type);
break;
}
blk_finish_plug(&plug);
@ -798,6 +794,7 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
stat_inc_call_count(sbi->stat_info);
f2fs_put_page(sum_page, 0);
return nfree;
}
int f2fs_gc(struct f2fs_sb_info *sbi)
@ -836,13 +833,10 @@ gc_more:
META_SSA);
for (i = 0; i < sbi->segs_per_sec; i++)
do_garbage_collect(sbi, segno + i, &gc_list, gc_type);
nfree += do_garbage_collect(sbi, segno + i, &gc_list, gc_type);
if (gc_type == FG_GC) {
if (gc_type == FG_GC)
sbi->cur_victim_sec = NULL_SEGNO;
nfree++;
WARN_ON(get_valid_blocks(sbi, segno, sbi->segs_per_sec));
}
if (has_not_enough_free_secs(sbi, nfree))
goto gc_more;