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btrfs: add extra warning if delayed iput is added when it's not allowed

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Since I have triggered the ASSERT() on the delayed iput too many times,
now is the time to add some extra debug warnings for delayed iput.

All delayed iputs should be queued after all ordered extents finish
their IO and all involved workqueues are flushed.

Thus after the btrfs_run_delayed_iputs() inside close_ctree(), there
should be no more delayed puts added.

So introduce a new BTRFS_FS_STATE_NO_DELAYED_IPUT, set after the above
mentioned timing.  And all btrfs_add_delayed_iput() will check that flag
and give a WARN_ON_ONCE().

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2025-03-10 15:44:56 +10:30 committed by David Sterba
parent 0aaaf10ae9
commit 19e60b2a95
3 changed files with 6 additions and 0 deletions
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2
fs/btrfs/disk-io.c
View File

@ -4397,6 +4397,8 @@ void __cold close_ctree(struct btrfs_fs_info *fs_info)
/* Ordered extents for free space inodes. */
btrfs_flush_workqueue(fs_info->endio_freespace_worker);
btrfs_run_delayed_iputs(fs_info);
/* There should be no more workload to generate new delayed iputs. */
set_bit(BTRFS_FS_STATE_NO_DELAYED_IPUT, &fs_info->fs_state);
cancel_work_sync(&fs_info->async_reclaim_work);
cancel_work_sync(&fs_info->async_data_reclaim_work);

3
fs/btrfs/fs.h
View File

@ -117,6 +117,9 @@ enum {
/* Indicates there was an error cleaning up a log tree. */
BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
/* No more delayed iput can be queued. */
BTRFS_FS_STATE_NO_DELAYED_IPUT,
BTRFS_FS_STATE_COUNT
};

1
fs/btrfs/inode.c
View File

@ -3427,6 +3427,7 @@ void btrfs_add_delayed_iput(struct btrfs_inode *inode)
if (atomic_add_unless(&inode->vfs_inode.i_count, -1, 1))
return;
WARN_ON_ONCE(test_bit(BTRFS_FS_STATE_NO_DELAYED_IPUT, &fs_info->fs_state));
atomic_inc(&fs_info->nr_delayed_iputs);
/*
* Need to be irq safe here because we can be called from either an irq