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authorJeff Mahoney <jeffm@suse.com>2019-03-27 15:24:12 +0300
committerDavid Sterba <dsterba@suse.com>2019-04-29 20:02:37 +0300
commit1c11b63eff2a67906cb9137bc6b2ee27767f313b (patch)
treeb68008df55c8d10a68832dacd19fa0f254b86f09 /fs/btrfs/transaction.h
parent68c94e55e1502868813a3cac2febc021d01edb75 (diff)
downloadlinux-1c11b63eff2a67906cb9137bc6b2ee27767f313b.tar.xz
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 <jeffm@suse.com> Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/transaction.h')
-rw-r--r--fs/btrfs/transaction.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 2bd76f681520..4419a4a0294b 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -51,7 +51,6 @@ struct btrfs_transaction {
wait_queue_head_t writer_wait;
wait_queue_head_t commit_wait;
struct list_head pending_snapshots;
- struct list_head pending_chunks;
struct list_head dev_update_list;
struct list_head switch_commits;
struct list_head dirty_bgs;