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From: Naohiro Aota <naohiro.aota@wdc.com>
To: linux-btrfs@vger.kernel.org, dsterba@suse.com
Cc: hare@suse.com, linux-fsdevel@vger.kernel.org,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>,
	Filipe Manana <fdmanana@gmail.com>
Subject: [PATCH v15 43/43] btrfs: zoned: deal with holes writing out tree-log pages
Date: Fri, 5 Feb 2021 18:26:35 +0900	[thread overview]
Message-ID: <20210205092635.i6w3c7brawlv6pgs@naota-xeon> (raw)
In-Reply-To: <b36444df121d46c6d9638a8ae8eacecaa845fbe4.1612434091.git.naohiro.aota@wdc.com>

Since the zoned filesystem requires sequential write out of metadata, we
cannot proceed with a hole in tree-log pages. When such a hole exists,
btree_write_cache_pages() will return -EAGAIN. We cannot wait for the range
to be written, because it will cause a deadlock. So, let's bail out to a
full commit in this case.

Cc: Filipe Manana <fdmanana@gmail.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/tree-log.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

This patch solves a regression introduced by fixing patch 40. I'm
sorry for the confusing patch numbering.

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 4e72794342c0..629e605cd62d 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3120,6 +3120,14 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
 	 */
 	blk_start_plug(&plug);
 	ret = btrfs_write_marked_extents(fs_info, &log->dirty_log_pages, mark);
+	/*
+	 * There is a hole writing out the extents and cannot proceed it on
+	 * zoned filesystem, which require sequential writing. We can
+	 * ignore the error for now, since we don't wait for completion for
+	 * now.
+	 */
+	if (ret == -EAGAIN)
+		ret = 0;
 	if (ret) {
 		blk_finish_plug(&plug);
 		btrfs_abort_transaction(trans, ret);
@@ -3229,7 +3237,16 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
 					 &log_root_tree->dirty_log_pages,
 					 EXTENT_DIRTY | EXTENT_NEW);
 	blk_finish_plug(&plug);
-	if (ret) {
+	/*
+	 * There is a hole in the extents, and failed to sequential write
+	 * on zoned filesystem. We cannot wait for this write outs, sinc it
+	 * cause a deadlock. Bail out to the full commit, instead.
+	 */
+	if (ret == -EAGAIN) {
+		btrfs_wait_tree_log_extents(log, mark);
+		mutex_unlock(&log_root_tree->log_mutex);
+		goto out_wake_log_root;
+	} else if (ret) {
 		btrfs_set_log_full_commit(trans);
 		btrfs_abort_transaction(trans, ret);
 		mutex_unlock(&log_root_tree->log_mutex);
-- 
2.30.0


  parent reply	other threads:[~2021-02-05  9:31 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-04 10:21 [PATCH v15 00/42] btrfs: zoned block device support Naohiro Aota
2021-02-04 10:21 ` [PATCH v15 01/42] block: add bio_add_zone_append_page Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 02/42] iomap: support REQ_OP_ZONE_APPEND Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 03/42] btrfs: zoned: defer loading zone info after opening trees Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 04/42] btrfs: zoned: use regular super block location on zone emulation Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 05/42] btrfs: release path before calling to btrfs_load_block_group_zone_info Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 06/42] btrfs: zoned: do not load fs_info::zoned from incompat flag Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 07/42] btrfs: zoned: disallow fitrim on zoned filesystems Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 08/42] btrfs: zoned: allow zoned filesystems on non-zoned block devices Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 09/42] btrfs: zoned: implement zoned chunk allocator Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 10/42] btrfs: zoned: verify device extent is aligned to zone Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 11/42] btrfs: zoned: load zone's allocation offset Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 12/42] btrfs: zoned: calculate allocation offset for conventional zones Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 13/42] btrfs: zoned: track unusable bytes for zones Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 14/42] btrfs: zoned: implement sequential extent allocation Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 15/42] btrfs: zoned: redirty released extent buffers Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 16/42] btrfs: zoned: advance allocation pointer after tree log node Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 17/42] btrfs: zoned: reset zones of unused block groups Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 18/42] btrfs: factor out helper adding a page to bio Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 19/42] btrfs: zoned: use bio_add_zone_append_page Naohiro Aota
2021-02-04 10:21   ` [PATCH v15 20/42] btrfs: zoned: handle REQ_OP_ZONE_APPEND as writing Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 21/42] btrfs: zoned: split ordered extent when bio is sent Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 22/42] btrfs: zoned: check if bio spans across an ordered extent Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 23/42] btrfs: extend btrfs_rmap_block for specifying a device Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 24/42] btrfs: zoned: cache if block-group is on a sequential zone Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 25/42] btrfs: save irq flags when looking up an ordered extent Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 26/42] btrfs: zoned: use ZONE_APPEND write for zoned btrfs Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 27/42] btrfs: zoned: enable zone append writing for direct IO Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 28/42] btrfs: zoned: introduce dedicated data write path for zoned filesystems Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 29/42] btrfs: zoned: serialize metadata IO Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 30/42] btrfs: zoned: wait for existing extents before truncating Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 31/42] btrfs: zoned: do not use async metadata checksum on zoned filesystems Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 32/42] btrfs: zoned: mark block groups to copy for device-replace Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 33/42] btrfs: zoned: implement cloning for zoned device-replace Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 34/42] btrfs: zoned: implement copying " Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 35/42] btrfs: zoned: support dev-replace in zoned filesystems Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 36/42] btrfs: zoned: enable relocation on a zoned filesystem Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 37/42] btrfs: zoned: relocate block group to repair IO failure in zoned filesystems Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 38/42] btrfs: split alloc_log_tree() Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 39/42] btrfs: zoned: extend zoned allocator to use dedicated tree-log block group Naohiro Aota
2021-02-04 10:22   ` [PATCH v15 40/42] btrfs: zoned: serialize log transaction on zoned filesystems Naohiro Aota
2021-02-04 11:50     ` Filipe Manana
2021-02-05  7:21       ` Naohiro Aota
2021-02-05  9:15     ` Naohiro Aota
2021-02-05 11:21       ` Filipe Manana
2021-02-09  1:49       ` David Sterba
2021-02-04 10:22   ` [PATCH v15 41/42] btrfs: zoned: reorder log node allocation on zoned filesystem Naohiro Aota
2021-02-04 11:57     ` Filipe Manana
2021-02-04 14:54       ` Johannes Thumshirn
2021-02-04 15:48         ` David Sterba
2021-02-04 15:51           ` Johannes Thumshirn
2021-02-04 10:22   ` [PATCH v15 42/42] btrfs: zoned: enable to mount ZONED incompat flag Naohiro Aota
2021-02-05  9:26   ` Naohiro Aota [this message]
2021-02-05 11:49     ` [PATCH v15 43/43] btrfs: zoned: deal with holes writing out tree-log pages Filipe Manana
2021-02-05 12:55       ` Naohiro Aota
2021-02-05 13:07         ` Filipe Manana
2021-02-05 14:19       ` Filipe Manana
2021-02-05 14:46         ` Naohiro Aota
2021-02-05 14:58     ` [PATCH v15.1 " Naohiro Aota
2021-02-05 16:25       ` Filipe Manana
2021-02-09  1:55       ` David Sterba
2021-02-10 19:58 ` [PATCH v15 00/42] btrfs: zoned block device support David Sterba
2021-02-11  9:58   ` Johannes Thumshirn
2021-02-11 15:19     ` David Sterba
2021-02-11 15:26       ` Johannes Thumshirn
2021-02-11 15:46         ` David Sterba
2021-02-15 16:58           ` Johannes Thumshirn
2021-02-15 17:02             ` David Sterba
2021-02-16  4:33             ` Naohiro Aota
2021-02-16 11:46               ` David Sterba
2021-02-22  7:50                 ` Naohiro Aota
2021-02-22 16:00                   ` David Sterba

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