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cc4804bfd6
linux/fs/btrfs
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Boris Burkov cc4804bfd6 btrfs: skip reclaim if block_group is empty 
As we delete extents from a block group, at some deletion we cross below
the reclaim threshold. It is possible we are still in the middle of
deleting more extents and might soon hit 0. If the block group is empty
by the time the reclaim worker runs, we will still relocate it.

This works just fine, as relocating an empty block group ultimately
results in properly deleting it. However, we have more direct ways of
removing empty block groups in the cleaner thread. Those are either
async discard or the unused_bgs list. In fact, when we decide whether to
relocate a block group during extent deletion, we do check for emptiness
and prefer the discard/unused_bgs mechanisms when possible.

Not using relocation for this case reduces some modest overhead from
empty bg relocation:

- extra transactions
- extra metadata use/churn for creating relocation metadata
- trying to read the extent tree to look for extents (and in this case
  finding none)

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2022-12-05 18:00:39 +01:00
..
tests for-6.1-rc4-tag 2022-11-10 08:58:29 -08:00
acl.c btrfs: reserve correct number of items for inode creation 2022-05-16 17:03:08 +02:00
async-thread.c btrfs: simplify WQ_HIGHPRI handling in struct btrfs_workqueue 2022-05-16 17:03:15 +02:00
async-thread.h btrfs: remove unused typedefs get_extent_t and btrfs_work_func_t 2022-07-25 17:45:36 +02:00
backref.c btrfs: avoid unnecessary resolution of indirect backrefs during fiemap 2022-12-05 18:00:39 +01:00
backref.h btrfs: avoid duplicated resolution of indirect backrefs during fiemap 2022-12-05 18:00:39 +01:00
block-group.c btrfs: skip reclaim if block_group is empty 2022-12-05 18:00:39 +01:00
block-group.h btrfs: move btrfs_should_fragment_free_space into block-group.c 2022-12-05 18:00:37 +01:00
block-rsv.c btrfs: introduce BTRFS_RESERVE_FLUSH_EMERGENCY 2022-12-05 18:00:38 +01:00
block-rsv.h btrfs: add KCSAN annotations for unlocked access to block_rsv->full 2022-09-26 12:28:02 +02:00
btrfs_inode.h btrfs: move btrfs_print_data_csum_error into inode.c 2022-12-05 18:00:37 +01:00
check-integrity.c fs/btrfs: Use the enum req_op and blk_opf_t types 2022-07-14 12:14:32 -06:00
check-integrity.h btrfs: check-integrity: split submit_bio from btrfsic checking 2022-05-16 17:03:12 +02:00
compression.c fs: fix leaked psi pressure state 2022-11-08 15:57:25 -08:00
compression.h for-5.20-tag 2022-08-03 14:54:52 -07:00
ctree.c btrfs: move btrfs_next_old_item into ctree.c 2022-12-05 18:00:37 +01:00
ctree.h btrfs: move the btrfs_verity_descriptor_item defs up in ctree.h 2022-12-05 18:00:37 +01:00
delalloc-space.c btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
delalloc-space.h btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
delayed-inode.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
delayed-inode.h btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
delayed-ref.c btrfs: switch btrfs_block_rsv::full to bool 2022-07-25 17:45:40 +02:00
delayed-ref.h btrfs: remove btrfs_delayed_extent_op::is_data 2022-05-16 17:17:31 +02:00
dev-replace.c btrfs: don't take a bio_counter reference for cloned bios 2022-09-26 12:27:58 +02:00
dev-replace.h btrfs: add struct declarations in dev-replace.h 2022-09-26 12:28:07 +02:00
dir-item.c btrfs: use btrfs_for_each_slot in btrfs_search_dir_index_item 2022-05-16 17:03:07 +02:00
discard.c
discard.h
disk-io.c btrfs: move btrfs_get_block_group helper out of disk-io.h 2022-12-05 18:00:36 +01:00
disk-io.h btrfs: move btrfs_get_block_group helper out of disk-io.h 2022-12-05 18:00:36 +01:00
export.c btrfs: fix type of parameter generation in btrfs_get_dentry 2022-10-24 15:28:58 +02:00
export.h btrfs: fix type of parameter generation in btrfs_get_dentry 2022-10-24 15:28:58 +02:00
extent_io.c btrfs: avoid duplicated resolution of indirect backrefs during fiemap 2022-12-05 18:00:39 +01:00
extent_io.h btrfs: move extent io tree unrelated prototypes to their appropriate header 2022-09-26 12:28:04 +02:00
extent_map.c btrfs: get the next extent map during fiemap/lseek more efficiently 2022-12-05 18:00:38 +01:00
extent_map.h btrfs: get the next extent map during fiemap/lseek more efficiently 2022-12-05 18:00:38 +01:00
extent-io-tree.c btrfs: cache the failed state when locking extents 2022-12-05 18:00:36 +01:00
extent-io-tree.h btrfs: cache the failed state when locking extents 2022-12-05 18:00:36 +01:00
extent-tree.c btrfs: fix tree mod log mishandling of reallocated nodes 2022-10-24 15:28:07 +02:00
file-item.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
file.c btrfs: skip unnecessary delalloc search during fiemap and lseek 2022-12-05 18:00:38 +01:00
free-space-cache.c btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
free-space-cache.h btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
free-space-tree.c btrfs: get rid of block group caching progress logic 2022-09-26 12:27:58 +02:00
free-space-tree.h
inode-item.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
inode-item.h
inode.c btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
ioctl.c btrfs: free btrfs_path before copying subvol info to userspace 2022-11-15 17:15:45 +01:00
Kconfig
locking.c btrfs: implement a nowait option for tree searches 2022-09-26 12:46:42 +02:00
locking.h btrfs: implement a nowait option for tree searches 2022-09-26 12:46:42 +02:00
lzo.c btrfs: replace kmap() with kmap_local_page() in lzo.c 2022-07-25 17:45:33 +02:00
Makefile btrfs: move extent state init and alloc functions to their own file 2022-09-26 12:28:03 +02:00
misc.h btrfs: convert the io_failure_tree to a plain rb_tree 2022-09-26 12:28:02 +02:00
ordered-data.c btrfs: use cached_state for btrfs_check_nocow_lock 2022-12-05 18:00:36 +01:00
ordered-data.h btrfs: use cached_state for btrfs_check_nocow_lock 2022-12-05 18:00:36 +01:00
orphan.c
print-tree.c btrfs: unify the error handling pattern for read_tree_block() 2022-03-14 13:13:53 +01:00
print-tree.h
props.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
props.h btrfs: move common inode creation code into btrfs_create_new_inode() 2022-05-16 17:03:08 +02:00
qgroup.c btrfs: qgroup: fix sleep from invalid context bug in btrfs_qgroup_inherit() 2022-11-21 14:57:52 +01:00
qgroup.h btrfs: introduce BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING to skip qgroup accounting 2022-09-26 12:28:01 +02:00
raid56.c btrfs: raid56: make it more explicit that cache rbio should have all its data sectors uptodate 2022-12-05 18:00:38 +01:00
raid56.h btrfs: properly abstract the parity raid bio handling 2022-09-26 12:27:59 +02:00
rcu-string.h
ref-verify.c
ref-verify.h
reflink.c btrfs: replace delete argument with EXTENT_CLEAR_ALL_BITS 2022-09-26 12:28:05 +02:00
reflink.h
relocation.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
root-tree.c btrfs: simplify error handling at btrfs_del_root_ref() 2022-09-26 12:27:58 +02:00
scrub.c btrfs: move BTRFS_MAX_MIRRORS into scrub.c 2022-12-05 18:00:37 +01:00
send.c btrfs: send: avoid unaligned encoded writes when attempting to clone range 2022-11-21 14:41:41 +01:00
send.h btrfs: send: allow protocol version 3 with CONFIG_BTRFS_DEBUG 2022-10-11 14:46:55 +02:00
space-info.c btrfs: introduce BTRFS_RESERVE_FLUSH_EMERGENCY 2022-12-05 18:00:38 +01:00
space-info.h btrfs: introduce BTRFS_RESERVE_FLUSH_EMERGENCY 2022-12-05 18:00:38 +01:00
struct-funcs.c btrfs: remove redundant check in up check_setget_bounds 2022-07-25 17:45:33 +02:00
subpage.c btrfs: convert process_page_range() to use filemap_get_folios_contig() 2022-09-11 20:26:03 -07:00
subpage.h btrfs: make nodesize >= PAGE_SIZE case to reuse the non-subpage routine 2022-05-16 17:03:11 +02:00
super.c btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
sysfs.c btrfs: sysfs: normalize the error handling branch in btrfs_init_sysfs() 2022-11-23 16:52:22 +01:00
sysfs.h
transaction.c btrfs: move trans_handle_cachep out of ctree.h 2022-12-05 18:00:37 +01:00
transaction.h btrfs: move trans_handle_cachep out of ctree.h 2022-12-05 18:00:37 +01:00
tree-checker.c btrfs: tree-checker: check for overlapping extent items 2022-08-17 16:20:25 +02:00
tree-checker.h btrfs: tree-checker: check extent buffer owner against owner rootid 2022-05-16 17:03:09 +02:00
tree-defrag.c
tree-log.c btrfs: do not modify log tree while holding a leaf from fs tree locked 2022-11-23 16:52:15 +01:00
tree-log.h btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
tree-mod-log.c
tree-mod-log.h
ulist.c
ulist.h
uuid-tree.c
verity.c btrfs: send: add support for fs-verity 2022-09-26 12:27:55 +02:00
volumes.c btrfs: zoned: initialize device's zone info for seeding 2022-11-07 14:35:24 +01:00
volumes.h btrfs: zoned: initialize device's zone info for seeding 2022-11-07 14:35:24 +01:00
xattr.c btrfs: check if root is readonly while setting security xattr 2022-08-22 18:06:30 +02:00
xattr.h
zlib.c btrfs: zlib: replace kmap() with kmap_local_page() in zlib_decompress_bio() 2022-07-25 17:45:41 +02:00
zoned.c btrfs: use kvcalloc in btrfs_get_dev_zone_info 2022-11-23 16:51:50 +01:00
zoned.h btrfs: zoned: clone zoned device info when cloning a device 2022-11-07 14:35:21 +01:00
zstd.c btrfs: zstd: replace kmap() with kmap_local_page() 2022-07-25 17:45:40 +02:00