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btrfs-progs: qgroup-verify: Don't treat qgroup difference as error if the fs hasn't initialized a rescan 

During fstests/btrfs/166, it's possible to hit a certain case where
qgroup is just enabled but rescan hasn't kicked in.

Since at qgroup enable time, we set the flag INCONSISTENT, and let later
rescan clear that flag. If power loss occurs before the rescan starts,
it's possible we get a qgroup status item with ON|INCONSISTENT but
without the RESCAN flag.

And in that case, it will definitely cause difference in qgroup
accounting as all numbers in the qgroup tree are 0.

Fix this false alert by also checking rescan progress from
btrfs_status_item.  And if we find rescan progress is still 0,
INCONSISTENT flag set and no RESCAN flag set, we won't treat it as an
error.

Reported-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2018-07-26 14:39:00 +08:00 committed by David Sterba
parent 4dca0ccf3d
commit 1d5b2ad921
1 changed files with 13 additions and 1 deletions
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14
qgroup-verify.c
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@ -84,6 +84,7 @@ static struct counts_tree {
unsigned int num_groups;
unsigned int rescan_running:1;
unsigned int qgroup_inconsist:1;
u64 scan_progress;
} counts = { .root = RB_ROOT };
static LIST_HEAD(bad_qgroups);
@ -922,6 +923,7 @@ static void read_qgroup_status(struct extent_buffer *eb, int slot,
counts->qgroup_inconsist = !!(flags &
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT);
counts->rescan_running = !!(flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN);
counts->scan_progress = btrfs_qgroup_status_rescan(eb, status_item);
}
static int load_quota_info(struct btrfs_fs_info *info)
@ -1319,6 +1321,7 @@ int report_qgroups(int all)
struct rb_node *node;
struct qgroup_count *c;
bool found_err = false;
bool skip_err = false;
if (!repair && counts.rescan_running) {
if (all) {
@ -1330,6 +1333,15 @@ int report_qgroups(int all)
return 0;
}
}
/*
* It's possible that rescan hasn't been initialized yet.
*/
if (counts.qgroup_inconsist && !counts.rescan_running &&
counts.rescan_running == 0) {
printf(
"Rescan hasn't been initialzied, a difference in qgroup accounting is expected\n");
skip_err = true;
}
if (counts.qgroup_inconsist && !counts.rescan_running)
fprintf(stderr, "Qgroup are marked as inconsistent.\n");
node = rb_first(&counts.root);
@ -1343,7 +1355,7 @@ int report_qgroups(int all)
node = rb_next(node);
}
if (found_err)
if (found_err && !skip_err)
return -EUCLEAN;
return 0;
}