From 1c11b63eff2a67906cb9137bc6b2ee27767f313b Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Wed, 27 Mar 2019 14:24:12 +0200 Subject: btrfs: replace pending/pinned chunks lists with io tree The pending chunks list contains chunks that are allocated in the current transaction but haven't been created yet. The pinned chunks list contains chunks that are being released in the current transaction. Both describe chunks that are not reflected on disk as in use but are unavailable just the same. The pending chunks list is anchored by the transaction handle, which means that we need to hold a reference to a transaction when working with the list. The way we use them is by iterating over both lists to perform comparisons on the stripes they describe for each device. This is backwards and requires that we keep a transaction handle open while we're trimming. This patchset adds an extent_io_tree to btrfs_device that maintains the allocation state of the device. Extents are set dirty when chunks are first allocated -- when the extent maps are added to the mapping tree. They're cleared when last removed -- when the extent maps are removed from the mapping tree. This matches the lifespan of the pending and pinned chunks list and allows us to do trims on unallocated space safely without pinning the transaction for what may be a lengthy operation. We can also use this io tree to mark which chunks have already been trimmed so we don't repeat the operation. Signed-off-by: Jeff Mahoney Signed-off-by: Nikolay Borisov Signed-off-by: David Sterba --- fs/btrfs/ctree.h | 6 ------ 1 file changed, 6 deletions(-) (limited to 'fs/btrfs/ctree.h') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 19833b4af630..93270e20a8e7 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1149,12 +1149,6 @@ struct btrfs_fs_info { struct mutex unused_bg_unpin_mutex; struct mutex delete_unused_bgs_mutex; - /* - * Chunks that can't be freed yet (under a trim/discard operation) - * and will be latter freed. Protected by fs_info->chunk_mutex. - */ - struct list_head pinned_chunks; - /* Cached block sizes */ u32 nodesize; u32 sectorsize; -- cgit v1.2.3-58-ga151