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f2fs: add a punch discard command function 

This patch add a function to punch discard command if one segment
reuse before discard. Split this segment from multi-segments discard
range, and discard the left bigger range.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yunlei He 2017-03-02 10:36:20 +08:00 committed by Jaegeuk Kim
parent c81abe34fe
commit 3d6a650feb
1 changed files with 20 additions and 2 deletions
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22
fs/f2fs/segment.c
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@ -759,6 +759,25 @@ static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
return 0;
}
static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
struct discard_cmd *dc, block_t blkaddr)
{
block_t end_block = START_BLOCK(sbi, GET_SEGNO(sbi, blkaddr) + 1);
if (dc->state == D_DONE || dc->lstart + dc->len <= end_block) {
__remove_discard_cmd(sbi, dc);
return;
}
if (blkaddr - dc->lstart < dc->lstart + dc->len - end_block) {
dc->start += (end_block - dc->lstart);
dc->len -= (end_block - dc->lstart);
dc->lstart = end_block;
} else {
dc->len = blkaddr - dc->lstart;
}
}
/* This should be covered by global mutex, &sit_i->sentry_lock */
void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
{
@ -781,8 +800,7 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
if (dc->lstart <= blkaddr && blkaddr < dc->lstart + dc->len) {
if (dc->state == D_SUBMIT)
wait_for_completion_io(&dc->wait);
else
__remove_discard_cmd(sbi, dc);
__punch_discard_cmd(sbi, dc, blkaddr);
}
}
blk_finish_plug(&plug);