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btrfs: zoned: wait until zone is finished when allocation didn't progress

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When the allocated position doesn't progress, we cannot submit IOs to
finish a block group, but there should be ongoing IOs that will finish a
block group. So, in that case, we wait for a zone to be finished and retry
the allocation after that.

Introduce a new flag BTRFS_FS_NEED_ZONE_FINISH for fs_info->flags to
indicate we need a zone finish to have proceeded. The flag is set when the
allocator detected it cannot activate a new block group. And, it is cleared
once a zone is finished.

CC: stable@vger.kernel.org # 5.16+
Fixes: afba2bc036 ("btrfs: zoned: implement active zone tracking")
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2022-07-09 08:18:50 +09:00 committed by David Sterba
parent 898793d992
commit 2ce543f478
4 changed files with 19 additions and 2 deletions
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5
fs/btrfs/ctree.h
View File

@ -638,6 +638,9 @@ enum {
/* Indicate we have half completed snapshot deletions pending. */
BTRFS_FS_UNFINISHED_DROPS,
/* Indicate we have to finish a zone to do next allocation. */
BTRFS_FS_NEED_ZONE_FINISH,
#if BITS_PER_LONG == 32
/* Indicate if we have error/warn message printed on 32bit systems */
BTRFS_FS_32BIT_ERROR,
@ -1086,6 +1089,8 @@ struct btrfs_fs_info {
spinlock_t zone_active_bgs_lock;
struct list_head zone_active_bgs;
/* Waiters when BTRFS_FS_NEED_ZONE_FINISH is set */
wait_queue_head_t zone_finish_wait;
/* Updates are not protected by any lock */
struct btrfs_commit_stats commit_stats;

1
fs/btrfs/disk-io.c
View File

@ -3152,6 +3152,7 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
init_waitqueue_head(&fs_info->transaction_blocked_wait);
init_waitqueue_head(&fs_info->async_submit_wait);
init_waitqueue_head(&fs_info->delayed_iputs_wait);
init_waitqueue_head(&fs_info->zone_finish_wait);
/* Usable values until the real ones are cached from the superblock */
fs_info->nodesize = 4096;

9
fs/btrfs/inode.c
View File

@ -1643,8 +1643,13 @@ static noinline int run_delalloc_zoned(struct btrfs_inode *inode,
if (ret == 0)
done_offset = end;
if (done_offset == start)
return -ENOSPC;
if (done_offset == start) {
struct btrfs_fs_info *info = inode->root->fs_info;
wait_var_event(&info->zone_finish_wait,
!test_bit(BTRFS_FS_NEED_ZONE_FINISH, &info->flags));
continue;
}
if (!locked_page_done) {
__set_page_dirty_nobuffers(locked_page);

6
fs/btrfs/zoned.c
View File

@ -2007,6 +2007,9 @@ static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_writ
/* For active_bg_list */
btrfs_put_block_group(block_group);
clear_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
wake_up_all(&fs_info->zone_finish_wait);
return 0;
}
@ -2043,6 +2046,9 @@ bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
}
mutex_unlock(&fs_info->chunk_mutex);
if (!ret)
set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
return ret;
}