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f2fs: do not issue next dnode discard redundantly 

We have a discard map, so that we can avoid redundant discard issues.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
steinar/wifi_calib_4_9_kernel
Jaegeuk Kim 2015-05-11 20:03:49 -07:00
parent 498c5e9fcd
commit 40a02be178
1 changed files with 14 additions and 1 deletions
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15
fs/f2fs/segment.c
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@ -486,7 +486,20 @@ static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)
{
if (f2fs_issue_discard(sbi, blkaddr, 1)) {
int err = -ENOTSUPP;
if (test_opt(sbi, DISCARD)) {
struct seg_entry *se = get_seg_entry(sbi,
GET_SEGNO(sbi, blkaddr));
unsigned int offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
if (f2fs_test_bit(offset, se->discard_map))
return;
err = f2fs_issue_discard(sbi, blkaddr, 1);
}
if (err) {
struct page *page = grab_meta_page(sbi, blkaddr);
/* zero-filled page */
set_page_dirty(page);