mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-09 20:32:04 +09:00
f1ee3b8829
Pull btrfs updates from David Sterba:
"We have a mix of all kinds of changes, feature updates, core stuff,
performance improvements and lots of cleanups and preparatory changes.
User visible:
- export filesystem generation in sysfs
- new features for mount option 'rescue':
- what's currently supported is exported in sysfs
- 'ignorebadroots'/'ibadroots' - continue even if some essential
tree roots are not usable (extent, uuid, data reloc, device,
csum, free space)
- 'ignoredatacsums'/'idatacsums' - skip checksum verification on
data
- 'all' - now enables 'ignorebadroots' + 'ignoredatacsums' +
'nologreplay'
- export read mirror policy settings to sysfs, new policies will be
added in the future
- remove inode number cache feature (mount -o inode_cache), obsoleted
in 5.9
User visible fixes:
- async discard scheduling fixes on high loads
- update inode byte counter atomically so stat() does not report
wrong value in some cases
- free space tree fixes:
- correctly report status of v2 after remount
- clear v1 cache inodes when v2 is newly enabled after remount
Core:
- switch own tree lock implementation to standard rw semaphore:
- one-level lock nesting is not required anymore, the last use of
this was in free space that's now loaded asynchronously
- own implementation of adaptive spinning before taking mutex has
been part of rwsem
- performance seems to be better in general, much better (+tens
of percents) for some workloads
- lockdep does not complain
- finish direct IO conversion to iomap infrastructure, remove
temporary workaround for DSYNC after iomap API updates
- preparatory work to support data and metadata blocks smaller than
page:
- generalize code that assumes sectorsize == PAGE_SIZE, lots of
refactoring
- planned namely for 64K pages (eg. arm64, ppc64)
- scrub read-only support
- preparatory work for zoned allocation mode (SMR/ZBC/ZNS friendly):
- disable incompatible features
- round-robin superblock write
- free space cache (v1) is loaded asynchronously, remove tree path
recursion
- slightly improved time tacking for transaction kthread wake ups
Performance improvements (note that the numbers depend on load type or
other features and weren't run on the same machine):
- skip unnecessary work:
- do not start readahead for csum tree when scrubbing non-data
block groups
- do not start and wait for delalloc on snapshot roots on
transaction commit
- fix race when defragmenting leads to unnecessary IO
- dbench speedups (+throughput%/-max latency%):
- skip unnecessary searches for xattrs when logging an inode
(+10.8/-8.2)
- stop incrementing log batch when joining log transaction (1-2)
- unlock path before checking if extent is shared during nocow
writeback (+5.0/-20.5), on fio load +9.7% throughput/-9.8%
runtime
- several tree log improvements, eg. removing unnecessary
operations, fixing races that lead to additional work
(+12.7/-8.2)
- tree-checker error branches annotated with unlikely() (+3%
throughput)
Other:
- cleanups
- lockdep fixes
- more btrfs_inode conversions
- error variable cleanups"
* tag 'for-5.11-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (198 commits)
btrfs: scrub: allow scrub to work with subpage sectorsize
btrfs: scrub: support subpage data scrub
btrfs: scrub: support subpage tree block scrub
btrfs: scrub: always allocate one full page for one sector for RAID56
btrfs: scrub: reduce width of extent_len/stripe_len from 64 to 32 bits
btrfs: refactor btrfs_lookup_bio_sums to handle out-of-order bvecs
btrfs: remove btrfs_find_ordered_sum call from btrfs_lookup_bio_sums
btrfs: handle sectorsize < PAGE_SIZE case for extent buffer accessors
btrfs: update num_extent_pages to support subpage sized extent buffer
btrfs: don't allow tree block to cross page boundary for subpage support
btrfs: calculate inline extent buffer page size based on page size
btrfs: factor out btree page submission code to a helper
btrfs: make btrfs_verify_data_csum follow sector size
btrfs: pass bio_offset to check_data_csum() directly
btrfs: rename bio_offset of extent_submit_bio_start_t to dio_file_offset
btrfs: fix lockdep warning when creating free space tree
btrfs: skip space_cache v1 setup when not using it
btrfs: remove free space items when disabling space cache v1
btrfs: warn when remount will not change the free space tree
btrfs: use superblock state to print space_cache mount option
...
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.