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d2311e6985
linux/fs/btrfs
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Qu Wenruo d2311e6985 btrfs: relocation: Delay reloc tree deletion after merge_reloc_roots 
Relocation code will drop btrfs_root::reloc_root as soon as
merge_reloc_root() finishes.

However later qgroup code will need to access btrfs_root::reloc_root
after merge_reloc_root() for delayed subtree rescan.

So alter the timming of resetting btrfs_root:::reloc_root, make it
happens after transaction commit.

With this patch, we will introduce a new btrfs_root::state,
BTRFS_ROOT_DEAD_RELOC_TREE, to info part of btrfs_root::reloc_tree user
that although btrfs_root::reloc_tree is still non-NULL, but still it's
not used any more.

The lifespan of btrfs_root::reloc tree will become:
          Old behavior            |              New
------------------------------------------------------------------------
btrfs_init_reloc_root()      ---  | btrfs_init_reloc_root()      ---
  set reloc_root              |   |   set reloc_root              |
                              |   |                               |
                              |   |                               |
merge_reloc_root()            |   | merge_reloc_root()            |
|- btrfs_update_reloc_root() ---  | |- btrfs_update_reloc_root() -+-
     clear btrfs_root::reloc_root |      set ROOT_DEAD_RELOC_TREE |
                                  |      record root into dirty   |
                                  |      roots rbtree             |
                                  |                               |
                                  | reloc_block_group() Or        |
                                  | btrfs_recover_relocation()    |
                                  | | After transaction commit    |
                                  | |- clean_dirty_subvols()     ---
                                  |     clear btrfs_root::reloc_root

During ROOT_DEAD_RELOC_TREE set lifespan, the only user of
btrfs_root::reloc_tree should be qgroup.

Since reloc root needs a longer life-span, this patch will also delay
btrfs_drop_snapshot() call.
Now btrfs_drop_snapshot() is called in clean_dirty_subvols().

This patch will increase the size of btrfs_root by 16 bytes.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25 14:13:25 +01:00
..
tests btrfs: remove always true if branch in find_delalloc_range 2018-12-17 14:51:44 +01:00
acl.c Btrfs: setup a nofs context for memory allocation at __btrfs_set_acl 2019-02-25 14:13:17 +01:00
async-thread.c btrfs: simplify workqueue name when allocating 2019-02-25 14:13:24 +01:00
async-thread.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
backref.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
backref.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
btrfs_inode.h Btrfs: fix fsync of files with multiple hard links in new directories 2018-12-17 14:51:43 +01:00
check-integrity.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
check-integrity.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
compression.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
compression.h btrfs: compression: Add linux/sizes.h for compression.h 2018-05-29 18:13:00 +02:00
ctree.c Btrfs: fix deadlock when allocating tree block during leaf/node split 2019-01-28 15:04:58 +01:00
ctree.h btrfs: relocation: Delay reloc tree deletion after merge_reloc_roots 2019-02-25 14:13:25 +01:00
dedupe.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
delayed-inode.c Btrfs: kill btrfs_clear_path_blocking 2018-10-15 17:23:38 +02:00
delayed-inode.h Btrfs: delayed-inode: use rb_first_cached for ins_root and del_root 2018-10-15 17:23:33 +02:00
delayed-ref.c btrfs: introduce delayed_refs_rsv 2018-12-17 14:51:46 +01:00
delayed-ref.h btrfs: add btrfs_delete_ref_head helper 2018-12-17 14:51:46 +01:00
dev-replace.c btrfs: merge btrfs_find_device and find_device 2019-02-25 14:13:24 +01:00
dev-replace.h btrfs: dev-replace: open code trivial locking helpers 2018-12-17 14:51:45 +01:00
dir-item.c btrfs: Remove root parameter from btrfs_insert_dir_item 2018-10-15 17:23:25 +02:00
disk-io.c btrfs: relocation: Delay reloc tree deletion after merge_reloc_roots 2019-02-25 14:13:25 +01:00
disk-io.h btrfs: drop extra enum initialization where using defaults 2018-12-17 14:51:43 +01:00
export.c btrfs: Remove 'objectid' member from struct btrfs_root 2018-10-15 17:23:25 +02:00
export.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
extent_io.c btrfs: Remove unused arguments from btrfs_get_extent_fiemap 2019-02-25 14:13:17 +01:00
extent_io.h btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
extent_map.c btrfs: Remove impossible condition from mergable_maps 2019-02-25 14:13:21 +01:00
extent_map.h btrfs: Remove impossible condition from mergable_maps 2019-02-25 14:13:21 +01:00
extent-tree.c btrfs: call btrfs_create_pending_block_groups unconditionally 2019-02-25 14:13:25 +01:00
file-item.c btrfs: replace btrfs_io_bio::end_io with a simple helper 2018-12-17 14:51:40 +01:00
file.c btrfs: Remove unused arguments from btrfs_get_extent_fiemap 2019-02-25 14:13:17 +01:00
free-space-cache.c Btrfs: fix deadlock on tree root leaf when finding free extent 2018-11-06 16:42:32 +01:00
free-space-cache.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
free-space-tree.c btrfs: use EXPORT_FOR_TESTS for conditionally exported functions 2018-12-17 14:51:37 +01:00
free-space-tree.h btrfs: Remove fs_info argument from add_to_free_space_tree 2018-05-28 18:07:36 +02:00
inode-item.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
inode-map.c btrfs: prune unused includes 2018-08-06 13:12:43 +02:00
inode-map.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
inode.c btrfs: Remove not_found_em label from btrfs_get_extent 2019-02-25 14:13:22 +01:00
ioctl.c btrfs: merge btrfs_find_device and find_device 2019-02-25 14:13:24 +01:00
Kconfig btrfs: add SPDX header to Kconfig 2018-04-12 16:29:55 +02:00
locking.c btrfs: replace waitqueue_actvie with cond_wake_up 2018-05-28 18:23:09 +02:00
locking.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
lzo.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
Makefile btrfs: Remove custom crc32c init code 2018-03-26 15:09:39 +02:00
math.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
ordered-data.c Btrfs: remove no longer used stuff for tracking pending ordered extents 2018-12-17 14:51:25 +01:00
ordered-data.h btrfs: switch BTRFS_ORDERED_* to enums 2018-12-17 14:51:43 +01:00
orphan.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
print-tree.c btrfs: annotate unlikely branches after V0 extent type removal 2018-08-06 13:12:41 +02:00
print-tree.h btrfs: print-tree: debugging output enhancement 2018-04-20 19:18:16 +02:00
props.c btrfs: property: Set incompat flag if lzo/zstd compression is set 2018-05-17 14:18:25 +02:00
props.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
qgroup.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
qgroup.h btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
raid56.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
raid56.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
rcu-string.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
reada.c btrfs: dev-replace: open code trivial locking helpers 2018-12-17 14:51:45 +01:00
ref-verify.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
ref-verify.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
relocation.c btrfs: relocation: Delay reloc tree deletion after merge_reloc_roots 2019-02-25 14:13:25 +01:00
root-tree.c btrfs: Remove fs_info from btrfs_add_root_ref 2018-08-06 13:13:00 +02:00
scrub.c btrfs: scrub: print messages when started or finished 2019-02-25 14:13:24 +01:00
send.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
send.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
struct-funcs.c btrfs: prune unused includes 2018-08-06 13:12:43 +02:00
super.c for-5.0-rc4-tag 2019-02-03 08:48:33 -08:00
sysfs.c btrfs: Add sysfs support for metadata_uuid feature 2018-12-17 14:51:37 +01:00
sysfs.h btrfs: drop extra enum initialization where using defaults 2018-12-17 14:51:43 +01:00
transaction.c btrfs: call btrfs_create_pending_block_groups unconditionally 2019-02-25 14:13:25 +01:00
transaction.h btrfs: drop extra enum initialization where using defaults 2018-12-17 14:51:43 +01:00
tree-checker.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
tree-checker.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
tree-defrag.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
tree-log.c btrfs: Fix typos in comments and strings 2018-12-17 14:51:50 +01:00
tree-log.h Btrfs: remove no longer used io_err from btrfs_log_ctx 2018-12-17 14:51:31 +01:00
ulist.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
ulist.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
uuid-tree.c btrfs: Remove fs_info argument from btrfs_uuid_tree_rem 2018-05-30 16:46:53 +02:00
volumes.c btrfs: merge btrfs_find_device and find_device 2019-02-25 14:13:24 +01:00
volumes.h btrfs: merge btrfs_find_device and find_device 2019-02-25 14:13:24 +01:00
xattr.c Btrfs: use nofs context when initializing security xattrs to avoid deadlock 2018-12-17 14:51:49 +01:00
xattr.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
zlib.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
zstd.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00