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@xxxxxxxxxxxxxxx # 5.16+
Fixes: afba2bc036b0 ("btrfs: zoned: implement active zone tracking")
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
---
fs/btrfs/ctree.h | 4 ++++
fs/btrfs/disk-io.c | 1 +
fs/btrfs/inode.c | 9 +++++++--
fs/btrfs/zoned.c | 6 ++++++
4 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c215e15baea2..ddecd92fa848 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -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,
@@ -1084,6 +1087,7 @@ struct btrfs_fs_info {
spinlock_t zone_active_bgs_lock;
struct list_head zone_active_bgs;
+ wait_queue_head_t zone_finish_wait;
/* Updates are not protected by any lock */
struct btrfs_commit_stats commit_stats;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 914557d59472..1fe5f79770a0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3135,6 +3135,7 @@ 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;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 681e2cb4dd9c..815121350d91 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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);
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 67098f3fcd14..471d870875ed 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -2006,6 +2006,9 @@ 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;
}
@@ -2042,6 +2045,9 @@ 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;
}
--
2.35.1
