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bd610c0937
linux/fs/btrfs
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Qu Wenruo bd610c0937 btrfs: only unlock the to-be-submitted ranges inside a folio 
[SUBPAGE COMPRESSION LIMITS]
Currently inside writepage_delalloc(), if a delalloc range is going to
be submitted asynchronously (inline or compression, the page
dirty/writeback/unlock are all handled in at different time, not at the
submission time), then we return 1 and extent_writepage() will skip the
submission.

This is fine if every sector matches page size, but if a sector is
smaller than page size (aka, subpage case), then it can be very
problematic, for example for the following 64K page:

     0     16K     32K    48K     64K
     |/|   |///////|      |/|
       |                    |
       4K                   52K

Where |/| is the dirty range we need to submit.

In the above case, we need the following different handling for the 3
ranges:

- [0, 4K) needs to be submitted for regular write
  A single sector cannot be compressed.

- [16K, 32K) needs to be submitted for compressed write

- [48K, 52K) needs to be submitted for regular write.

Above, if we try to submit [16K, 32K) for compressed write, we will
return 1 and immediately, and without submitting the remaining
[48K, 52K) range.

Furthermore, since extent_writepage() will exit without unlocking any
sectors, the submitted range [0, 4K) will not have sector unlocked.

That's the reason why for now subpage is only allowed for full page
range.

[ENHANCEMENT]
- Introduce a submission bitmap at btrfs_bio_ctrl::submit_bitmap
  This records which sectors will be submitted by extent_writepage_io().
  This allows us to track which sectors needs to be submitted thus later
  to be properly unlocked.

  For asynchronously submitted range (inline/compression), the
  corresponding bits will be cleared from that bitmap.

- Only return 1 if no sector needs to be submitted in
  writepage_delalloc()

- Only submit sectors marked by submission bitmap inside
  extent_writepage_io()
  So we won't touch the asynchronously submitted part.

- Introduce btrfs_folio_end_writer_lock_bitmap() helper
  This will only unlock the involved sectors specified by @bitmap
  parameter, to avoid touching the range asynchronously submitted.

Please note that, since subpage compression is still limited to page
aligned range, this change is only a preparation for future sector
perfect compression support for subpage.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2024-09-10 16:51:22 +02:00
..
tests btrfs: convert find_lock_delalloc_range() to use a folio 2024-09-10 16:51:14 +02:00
accessors.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
accessors.h btrfs: remove raid-stripe-tree encoding field from stripe_extent 2024-07-11 15:33:28 +02:00
acl.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
acl.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
async-thread.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
async-thread.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
backref.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
backref.h btrfs: uninline some static inline helpers from backref.h 2024-03-04 16:24:53 +01:00
bio.c btrfs: merge btrfs_orig_bbio_end_io() into btrfs_bio_end_io() 2024-09-10 16:51:20 +02:00
bio.h btrfs: rename btrfs_submit_bio() to btrfs_submit_bbio() 2024-09-10 16:51:19 +02:00
block-group.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
block-group.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
block-rsv.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
block-rsv.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
btrfs_inode.h btrfs: rework BTRFS_I as macro to preserve parameter const 2024-09-10 16:51:22 +02:00
compression.c btrfs: convert btrfs_decompress() to take a folio 2024-09-10 16:51:21 +02:00
compression.h btrfs: convert btrfs_decompress() to take a folio 2024-09-10 16:51:21 +02:00
ctree.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
ctree.h btrfs: DEFINE_FREE for struct btrfs_path 2024-09-10 16:51:22 +02:00
defrag.c btrfs: always pass readahead state to defrag 2024-09-10 16:51:20 +02:00
defrag.h btrfs: drop transaction parameter from btrfs_add_inode_defrag() 2024-09-10 16:51:19 +02:00
delalloc-space.c btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
delalloc-space.h btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
delayed-inode.c btrfs: pass a btrfs_inode to btrfs_readdir_get_delayed_items() 2024-07-11 15:33:28 +02:00
delayed-inode.h btrfs: pass a btrfs_inode to btrfs_readdir_get_delayed_items() 2024-07-11 15:33:28 +02:00
delayed-ref.c btrfs: qgroup: use xarray to track dirty extents in transaction 2024-09-10 16:51:18 +02:00
delayed-ref.h btrfs: qgroup: use xarray to track dirty extents in transaction 2024-09-10 16:51:18 +02:00
dev-replace.c btrfs: more efficient chunk map iteration when device replace finishes 2024-09-10 16:51:17 +02:00
dev-replace.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
dir-item.c btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
dir-item.h btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
direct-io.c btrfs: do not hold the extent lock for entire read 2024-09-10 16:51:20 +02:00
direct-io.h btrfs: move the direct IO code into its own file 2024-07-11 15:33:29 +02:00
discard.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
discard.h
disk-io.c btrfs: convert try_release_extent_buffer() to take a folio 2024-09-10 16:51:20 +02:00
disk-io.h btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
export.c btrfs: remove super block argument from btrfs_iget() 2024-07-11 15:33:25 +02:00
export.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
extent_io.c btrfs: only unlock the to-be-submitted ranges inside a folio 2024-09-10 16:51:22 +02:00
extent_io.h btrfs: convert try_release_extent_mapping() to take a folio 2024-09-10 16:51:21 +02:00
extent_map.c btrfs: reduce size and overhead of extent_map_block_end() 2024-09-10 16:51:12 +02:00
extent_map.h btrfs: do not directly include rwlock_types.h 2024-07-11 15:33:22 +02:00
extent-io-tree.c btrfs: introduce EXTENT_DIO_LOCKED 2024-09-10 16:51:20 +02:00
extent-io-tree.h btrfs: introduce EXTENT_DIO_LOCKED 2024-09-10 16:51:20 +02:00
extent-tree.c btrfs: always update fstrim_range on failure in FITRIM ioctl 2024-09-10 16:51:21 +02:00
extent-tree.h btrfs: do not BUG_ON() when freeing tree block after error 2024-07-11 15:33:26 +02:00
fiemap.c btrfs: initialize last_extent_end to fix -Wmaybe-uninitialized warning in extent_fiemap() 2024-08-26 16:58:13 +02:00
fiemap.h btrfs: move fiemap code into its own file 2024-07-11 15:33:20 +02:00
file-item.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
file-item.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
file.c btrfs: add and use helper to verify the calling task has locked the inode 2024-09-10 16:51:22 +02:00
file.h btrfs: move the direct IO code into its own file 2024-07-11 15:33:29 +02:00
free-space-cache.c btrfs: zoned: properly take lock to read/update block group's zoned variables 2024-08-15 20:35:56 +02:00
free-space-cache.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
free-space-tree.c btrfs: do not BUG_ON() when freeing tree block after error 2024-07-11 15:33:26 +02:00
free-space-tree.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
fs.c
fs.h btrfs: subpage: remove btrfs_fs_info::subpage_info member 2024-09-10 16:51:18 +02:00
inode-item.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
inode-item.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
inode.c btrfs: convert btrfs_decompress() to take a folio 2024-09-10 16:51:21 +02:00
ioctl.c btrfs: always update fstrim_range on failure in FITRIM ioctl 2024-09-10 16:51:21 +02:00
ioctl.h btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
Kconfig btrfs: check-integrity: remove CONFIG_BTRFS_FS_CHECK_INTEGRITY option 2023-10-12 16:44:05 +02:00
locking.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
locking.h btrfs: cleanup recursive include of the same header 2024-07-11 15:33:22 +02:00
lru_cache.c btrfs: fix typos found by codespell 2023-12-15 23:00:04 +01:00
lru_cache.h btrfs: cleanup recursive include of the same header 2024-07-11 15:33:22 +02:00
lzo.c btrfs: convert lzo_decompress() to take a folio 2024-09-10 16:51:21 +02:00
Makefile btrfs: move the direct IO code into its own file 2024-07-11 15:33:29 +02:00
messages.c btrfs: introduce new "rescue=ignoremetacsums" mount option 2024-07-11 15:33:29 +02:00
messages.h btrfs: constify fs_info parameter in __btrfs_panic() 2023-12-15 20:27:02 +01:00
misc.h btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
ordered-data.c btrfs: add and use helper to verify the calling task has locked the inode 2024-09-10 16:51:22 +02:00
ordered-data.h btrfs: convert btrfs_mark_ordered_io_finished() to take a folio 2024-09-10 16:51:14 +02:00
orphan.c btrfs: BTRFS_PATH_AUTO_FREE in orphan.c 2024-09-10 16:51:22 +02:00
orphan.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
print-tree.c btrfs: avoid using fixed char array size for tree names 2024-08-02 22:44:27 +02:00
print-tree.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
props.c btrfs: pass a btrfs_inode to btrfs_set_prop() 2024-07-11 15:33:29 +02:00
props.h btrfs: pass a btrfs_inode to btrfs_set_prop() 2024-07-11 15:33:29 +02:00
qgroup.c btrfs: qgroup: use xarray to track dirty extents in transaction 2024-09-10 16:51:18 +02:00
qgroup.h btrfs: qgroup: use xarray to track dirty extents in transaction 2024-09-10 16:51:18 +02:00
raid56.c btrfs: rename the extra_gfp parameter of btrfs_alloc_page_array() 2024-07-11 15:33:30 +02:00
raid56.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
raid-stripe-tree.c btrfs: change RST lookup error message level to debug 2024-09-10 16:51:17 +02:00
raid-stripe-tree.h btrfs: remove raid-stripe-tree encoding field from stripe_extent 2024-07-11 15:33:28 +02:00
rcu-string.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
ref-verify.c btrfs: fix uninitialized return value in the ref-verify tool 2024-07-02 19:14:57 +02:00
ref-verify.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
reflink.c btrfs: convert copy_inline_to_page() to use folio 2024-09-10 16:51:21 +02:00
reflink.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
relocation.c btrfs: don't readahead the relocation inode on RST 2024-09-10 16:51:17 +02:00
relocation.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
root-tree.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
root-tree.h btrfs: qgroup: fix qgroup prealloc rsv leak in subvolume operations 2024-04-02 19:18:23 +02:00
scrub.c btrfs: rename btrfs_submit_bio() to btrfs_submit_bbio() 2024-09-10 16:51:19 +02:00
scrub.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
send.c btrfs: send: fix grammar in comments 2024-09-10 16:51:18 +02:00
send.h btrfs: pass a btrfs_inode to btrfs_ioctl_send() 2024-07-11 15:33:28 +02:00
space-info.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
space-info.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
subpage.c btrfs: only unlock the to-be-submitted ranges inside a folio 2024-09-10 16:51:22 +02:00
subpage.h btrfs: only unlock the to-be-submitted ranges inside a folio 2024-09-10 16:51:22 +02:00
super.c btrfs: only enable extent map shrinker for DEBUG builds 2024-08-16 21:22:39 +02:00
super.h btrfs: change BTRFS_MOUNT_* flags to 64bit type 2024-07-19 17:20:23 +02:00
sysfs.c btrfs: introduce new "rescue=ignoresuperflags" mount option 2024-07-11 15:33:30 +02:00
sysfs.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
transaction.c btrfs: qgroup: use xarray to track dirty extents in transaction 2024-09-10 16:51:18 +02:00
transaction.h btrfs: fix race between direct IO write and fsync when using same fd 2024-09-03 20:29:55 +02:00
tree-checker.c btrfs: tree-checker: add dev extent item checks 2024-08-15 20:35:52 +02:00
tree-checker.h btrfs: make sure that WRITTEN is set on all metadata blocks 2024-05-02 22:11:13 +02:00
tree-log.c btrfs: add and use helper to verify the calling task has locked the inode 2024-09-10 16:51:22 +02:00
tree-log.h btrfs: avoid transaction commit on any fsync after subvolume creation 2024-07-11 15:33:24 +02:00
tree-mod-log.c btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
tree-mod-log.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
ulist.c btrfs: preallocate ulist memory for qgroup rsv 2024-07-11 15:33:26 +02:00
ulist.h btrfs: preallocate ulist memory for qgroup rsv 2024-07-11 15:33:26 +02:00
uuid-tree.c btrfs: move uuid tree related code to uuid-tree.[ch] 2024-09-10 16:51:12 +02:00
uuid-tree.h btrfs: move uuid tree related code to uuid-tree.[ch] 2024-09-10 16:51:12 +02:00
verity.c btrfs: add and use helper to verify the calling task has locked the inode 2024-09-10 16:51:22 +02:00
verity.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
volumes.c btrfs: reduce chunk_map lookups in btrfs_map_block() 2024-09-10 16:51:18 +02:00
volumes.h btrfs: rename btrfs_io_stripe::is_scrub to rst_search_commit_root 2024-09-10 16:51:17 +02:00
xattr.c btrfs: add and use helper to verify the calling task has locked the inode 2024-09-10 16:51:22 +02:00
xattr.h btrfs: constify pointer parameters where applicable 2024-07-11 15:33:22 +02:00
zlib.c btrfs: convert zlib_decompress() to take a folio 2024-09-10 16:51:21 +02:00
zoned.c btrfs: use btrfs_path auto free in zoned.c 2024-09-10 16:51:22 +02:00
zoned.h btrfs: constify more pointer parameters 2024-09-10 16:51:22 +02:00
zstd.c btrfs: convert zstd_decompress() to take a folio 2024-09-10 16:51:21 +02:00