f2fs: combine huge num of discard rb tree consistence checks

Came across a hungtask caused by huge number of rb tree traversing
during adding discard addrs in cp. This patch combine these consistence
checks and move it to discard thread.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 46ee113..3c24a8c 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -917,7 +917,6 @@ static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
                dc->len = blkaddr - dc->lstart;
                dcc->undiscard_blks += dc->len;
                __relocate_discard_cmd(dcc, dc);
-               f2fs_bug_on(sbi, !__check_rb_tree_consistence(sbi, &dcc->root));
                modified = true;
        }
 
@@ -927,16 +926,12 @@ static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
                                        di.start + blkaddr + 1 - di.lstart,
                                        di.lstart + di.len - 1 - blkaddr,
                                        NULL, NULL);
-                       f2fs_bug_on(sbi,
-                               !__check_rb_tree_consistence(sbi, &dcc->root));
                } else {
                        dc->lstart++;
                        dc->len--;
                        dc->start++;
                        dcc->undiscard_blks += dc->len;
                        __relocate_discard_cmd(dcc, dc);
-                       f2fs_bug_on(sbi,
-                               !__check_rb_tree_consistence(sbi, &dcc->root));
                }
        }
 }
@@ -997,8 +992,6 @@ static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
                        prev_dc->di.len += di.len;
                        dcc->undiscard_blks += di.len;
                        __relocate_discard_cmd(dcc, prev_dc);
-                       f2fs_bug_on(sbi,
-                               !__check_rb_tree_consistence(sbi, &dcc->root));
                        di = prev_dc->di;
                        tdc = prev_dc;
                        merged = true;
@@ -1014,16 +1007,12 @@ static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
                        __relocate_discard_cmd(dcc, next_dc);
                        if (tdc)
                                __remove_discard_cmd(sbi, tdc);
-                       f2fs_bug_on(sbi,
-                               !__check_rb_tree_consistence(sbi, &dcc->root));
                        merged = true;
                }
 
                if (!merged) {
                        __insert_discard_tree(sbi, bdev, di.lstart, di.start,
                                                        di.len, NULL, NULL);
-                       f2fs_bug_on(sbi,
-                               !__check_rb_tree_consistence(sbi, &dcc->root));
                }
  next:
                prev_dc = next_dc;
@@ -1062,6 +1051,8 @@ static void __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond)
        int i, iter = 0;
 
        mutex_lock(&dcc->cmd_lock);
+       f2fs_bug_on(sbi,
+               !__check_rb_tree_consistence(sbi, &dcc->root));
        blk_start_plug(&plug);
        for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
                pend_list = &dcc->pend_list[i];