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From: Naohiro Aota <naohiro.aota@wdc.com>
To: linux-btrfs@vger.kernel.org, David Sterba <dsterba@suse.com>
Cc: Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>,
	Nikolay Borisov <nborisov@suse.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Matias Bjorling <Matias.Bjorling@wdc.com>,
	Johannes Thumshirn <jthumshirn@suse.de>,
	Hannes Reinecke <hare@suse.com>,
	Anand Jain <anand.jain@oracle.com>,
	linux-fsdevel@vger.kernel.org,
	Naohiro Aota <naohiro.aota@wdc.com>
Subject: [PATCH v4 11/27] btrfs: make unmirroed BGs readonly only if we have at least one writable BG
Date: Fri, 23 Aug 2019 19:10:20 +0900	[thread overview]
Message-ID: <20190823101036.796932-12-naohiro.aota@wdc.com> (raw)
In-Reply-To: <20190823101036.796932-1-naohiro.aota@wdc.com>

If the btrfs volume has mirrored block groups, it unconditionally makes
un-mirrored block groups read only. When we have mirrored block groups, but
don't have writable block groups, this will drop all writable block groups.
So, check if we have at least one writable mirrored block group before
setting un-mirrored block groups read only.

This change is necessary to handle e.g. xfstests btrfs/124 case.

When we mount degraded RAID1 FS and write to it, and then re-mount with
full device, the write pointers of corresponding zones of written BG
differ. We mark such block group as "wp_broken" and make it read only. In
this situation, we only have read only RAID1 BGs because of "wp_broken" and
un-mirrored BGs are also marked read only, because we have RAID1 BGs. As a
result, all the BGs are now read only, so that we cannot even start the
rebalance to fix the situation.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/extent-tree.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 922592e82fb9..0f845cfb2442 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8134,6 +8134,27 @@ static int check_chunk_block_group_mappings(struct btrfs_fs_info *fs_info)
 	return ret;
 }
 
+/*
+ * have_mirrored_block_group - check if we have at least one writable
+ *                             mirrored Block Group
+ */
+static bool have_mirrored_block_group(struct btrfs_space_info *space_info)
+{
+	struct btrfs_block_group_cache *cache;
+	int i;
+
+	for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
+		if (i == BTRFS_RAID_RAID0 || i == BTRFS_RAID_SINGLE)
+			continue;
+		list_for_each_entry(cache, &space_info->block_groups[i],
+				    list) {
+			if (!cache->ro)
+				return true;
+		}
+	}
+	return false;
+}
+
 int btrfs_read_block_groups(struct btrfs_fs_info *info)
 {
 	struct btrfs_path *path;
@@ -8321,6 +8342,10 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info)
 		       BTRFS_BLOCK_GROUP_RAID56_MASK |
 		       BTRFS_BLOCK_GROUP_DUP)))
 			continue;
+
+		if (!have_mirrored_block_group(space_info))
+			continue;
+
 		/*
 		 * avoid allocating from un-mirrored block group if there are
 		 * mirrored block groups.
-- 
2.23.0


  parent reply	other threads:[~2019-08-23 10:11 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 10:10 [PATCH v4 00/27] btrfs zoned block device support Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 01/27] btrfs: introduce HMZONED feature flag Naohiro Aota
2019-08-23 11:45   ` Johannes Thumshirn
2019-08-23 10:10 ` [PATCH v4 02/27] btrfs: Get zone information of zoned block devices Naohiro Aota
2019-08-23 11:57   ` Johannes Thumshirn
2019-08-26  6:29     ` Naohiro Aota
2019-08-24  9:22   ` kbuild test robot
2019-08-24 10:49   ` kbuild test robot
2019-08-23 10:10 ` [PATCH v4 03/27] btrfs: Check and enable HMZONED mode Naohiro Aota
2019-08-23 12:07   ` Johannes Thumshirn
2019-08-26  8:38     ` Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 04/27] btrfs: disallow RAID5/6 in " Naohiro Aota
2019-08-23 12:09   ` Johannes Thumshirn
2019-08-23 10:10 ` [PATCH v4 05/27] btrfs: disallow space_cache " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 06/27] btrfs: disallow NODATACOW " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 07/27] btrfs: disable tree-log " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 08/27] btrfs: disable fallocate " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 09/27] btrfs: align device extent allocation to zone boundary Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 10/27] btrfs: do sequential extent allocation in HMZONED mode Naohiro Aota
2019-08-23 10:10 ` Naohiro Aota [this message]
2019-08-23 10:10 ` [PATCH v4 12/27] btrfs: ensure metadata space available on/after degraded mount in HMZONED Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 13/27] btrfs: reset zones of unused block groups Naohiro Aota
2019-08-24 11:32   ` kbuild test robot
2019-08-25  4:56   ` kbuild test robot
2019-08-23 10:10 ` [PATCH v4 14/27] btrfs: limit super block locations in HMZONED mode Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 15/27] btrfs: redirty released extent buffers in sequential BGs Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 16/27] btrfs: serialize data allocation and submit IOs Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 17/27] btrfs: implement atomic compressed IO submission Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 18/27] btrfs: support direct write IO in HMZONED Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 19/27] btrfs: serialize meta IOs on HMZONED mode Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 20/27] btrfs: wait existing extents before truncating Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 21/27] btrfs: avoid async checksum/submit on HMZONED mode Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 22/27] btrfs: disallow mixed-bg in " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 23/27] btrfs: disallow inode_cache " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 24/27] btrfs: support dev-replace " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 25/27] btrfs: enable relocation " Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 26/27] btrfs: relocate block group to repair IO failure in HMZONED Naohiro Aota
2019-08-23 10:10 ` [PATCH v4 27/27] btrfs: enable to mount HMZONED incompat flag Naohiro Aota

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