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f2fs: flush stale issued discard candidates 

Sometimes, I could observe # of issuing_discard to be 1 which blocks background
jobs due to is_idle()=false.
The only way to get out of it was to trigger gc_urgent. This patch avoids that
by checking any candidates as done in the list.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2018-12-13 20:50:51 -08:00
parent 72691af6db
commit 76c7bfb3a8
1 changed files with 4 additions and 0 deletions
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4
fs/f2fs/segment.c
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@ -1652,6 +1652,10 @@ static int issue_discard_thread(void *data)
if (dcc->discard_wake)
dcc->discard_wake = 0;
/* clean up pending candidates before going to sleep */
if (atomic_read(&dcc->queued_discard))
__wait_all_discard_cmd(sbi, NULL);
if (try_to_freeze())
continue;
if (f2fs_readonly(sbi->sb))