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Subject[GIT PULL] Btrfs updates for 5.5

there are some new features, followed by cleanups. Please pull, thanks.

User visible changes:

- new block group profiles: RAID1 with 3- and 4- copies
- RAID1 in btrfs has always 2 copies, now add support for 3 and 4
- this is an incompat feature (named RAID1C34)
- recommended use of RAID1C3 is replacement of RAID6 profile on metadata,
this brings a more reliable resiliency against 2 device loss/damage

- support for new checksums
- per-filesystem, set at mkfs time
- fast hash (crc32c successor): xxhash, 64bit digest
- strong hashes (both 256bit): sha256 (slower, FIPS), blake2b (faster)
- the blake2b module goes via the crypto tree, btrfs.ko has a soft

- speed up lseek, don't take inode locks unnecessarily, this can speed up
parallel SEEK_CUR/SEEK_SET/SEEK_END by 80%

- send:
- allow clone operations within the same file
- limit maximum number of sent clone references to avoid slow backref walking

- error message improvements: device scan prints process name and PID

Core changes:

- cleanups
- remove unique workqueue helpers, used to provide a way to avoid deadlocks
in the workqueue code, now done in a simpler way
- remove lots of indirect function calls in compression code
- extent IO tree code moved out of extent_io.c
- cleanup backup superblock handling at mount time
- transaction life cycle documentation and cleanups
- locking code cleanups, annotations and documentation
- add more cold, const, pure function attributes
- removal of unused or redundant struct members or variables

- new tree-checker sanity tests
- try to detect missing INODE_ITEM, cross-reference checks of DIR_ITEM,

- remove own bio scheduling code (used to avoid checksum submissions being
stuck behind other IO), replaced by cgroup controller-based code to allow
better control and avoid priority inversions in cases where the custom and
cgroup scheduling disagreed


- avoid getting stuck during cyclic writebacks

- fix trimming of ranges crossing block group boundaries

- fix rename exchange on subvolumes, all involved subvolumes need to be
recorded in the transaction

The following changes since commit af42d3466bdc8f39806b26f593604fdc54140bcb:

Linux 5.4-rc8 (2019-11-17 14:47:30 -0800)

are available in the Git repository at:

git:// for-5.5-tag

for you to fetch changes up to fa17ed069c61286b26382e23b57a62930657b9c1:

btrfs: drop bdev argument from submit_extent_page (2019-11-18 23:43:58 +0100)

Anand Jain (3):
btrfs: balance: use term redundancy instead of integrity in message
btrfs: print process name and pid that calls device scanning
btrfs: use bool argument in free_root_pointers()

Chengguang Xu (3):
btrfs: props: remove unnecessary hash_init()
btrfs: use enum for extent type defines
btrfs: use better definition of number of compression type

Chris Mason (5):
Btrfs: stop using btrfs_schedule_bio()
Btrfs: delete the entire async bio submission framework
Btrfs: only associate the locked page with one async_chunk struct
Btrfs: use REQ_CGROUP_PUNT for worker thread submitted bios
Btrfs: extent_write_locked_range() should attach inode->i_wb

Dan Carpenter (1):
btrfs: clean up locking name in scrub_enumerate_chunks()

David Sterba (54):
btrfs: make locking assertion helpers static inline
btrfs: make btrfs_assert_tree_locked static inline
btrfs: move btrfs_set_path_blocking to other locking functions
btrfs: move btrfs_unlock_up_safe to other locking functions
btrfs: add 64bit safe helper for power of two checks
btrfs: use has_single_bit_set for clarity
btrfs: drop unused parameter is_new from btrfs_iget
btrfs: add __cold attribute to more functions
btrfs: add const function attribute
btrfs: add __pure attribute to functions
btrfs: opencode extent_buffer_get
btrfs: export compression and decompression callbacks
btrfs: switch compression callbacks to direct calls
btrfs: compression: attach workspace manager to the ops
btrfs: compression: let workspace manager init take only the type
btrfs: compression: inline init_workspace_manager
btrfs: compression: let workspace manager cleanup take only the type
btrfs: compression: inline cleanup_workspace_manager
btrfs: compression: export alloc/free/get/put callbacks of all algos
btrfs: compression: inline get_workspace
btrfs: compression: inline put_workspace
btrfs: compression: pass type to btrfs_get_workspace
btrfs: compression: inline alloc_workspace
btrfs: compression: pass type to btrfs_put_workspace
btrfs: compression: inline free_workspace
btrfs: compression: remove ops pointer from workspace_manager
btrfs: tracepoints: drop typecasts from printk
btrfs: tracepoints: constify all pointers
btrfs: assert extent_map bdevs and lookup_map and split
btrfs: get bdev from latest_dev for dio bh_result
btrfs: sysfs: export supported checksums
btrfs: add member for a specific checksum driver
btrfs: add blake2b to checksumming algorithms
btrfs: move block_group_item::used to block group
btrfs: move block_group_item::flags to block group
btrfs: remove embedded block_group_cache::item
btrfs: rename block_group_item on-stack accessors to follow naming
btrfs: rename extent buffer block group item accessors
btrfs: add dedicated members for start and length of a block group
btrfs: sink write_flags to __extent_writepage_io
btrfs: sink write flags to cow_file_range_async
btrfs: add support for 3-copy replication (raid1c3)
btrfs: add support for 4-copy replication (raid1c4)
btrfs: add incompat for raid1 with 3, 4 copies
btrfs: drop incompat bit for raid1c34 after last block group is gone
btrfs: merge blocking_writers branches in btrfs_tree_read_lock
btrfs: set blocking_writers directly, no increment or decrement
btrfs: access eb::blocking_writers according to ACCESS_ONCE policies
btrfs: document extent buffer locking
btrfs: rename btrfs_block_group_cache
btrfs: get bdev directly from fs_devices in submit_extent_page
btrfs: drop bio_set_dev where not needed
btrfs: remove extent_map::bdev
btrfs: drop bdev argument from submit_extent_page

Filipe Manana (8):
Btrfs: make btrfs_wait_extents() static
Btrfs: fix negative subv_writers counter and data space leak after buffered write
Btrfs: fix metadata space leak on fixup worker failure to set range as delalloc
Btrfs: remove wait queue from space_info structure
Btrfs: remove unnecessary delalloc mutex for inodes
Btrfs: send, allow clone operations within the same file
Btrfs: send, skip backreference walking for extents with many references
Btrfs: fix block group remaining RO forever after error during device replace

Goldwyn Rodrigues (1):
btrfs: simplify inode locking for RWF_NOWAIT

Johannes Thumshirn (10):
btrfs: raid56: reduce indentation in lock_stripe_add
btrfs: remove pointless local variable in lock_stripe_add()
btrfs: reduce indentation in btrfs_may_alloc_data_chunk
btrfs: remove pointless indentation in btrfs_read_sys_array()
btrfs: add xxhash64 to checksumming algorithms
btrfs: add sha256 to checksumming algorithm
btrfs: sysfs: show used checksum driver per filesystem
btrfs: remove cached space_info in btrfs_statfs()
btrfs: change btrfs_fs_devices::seeding to bool
btrfs: change btrfs_fs_devices::rotating to bool

Josef Bacik (9):
btrfs: separate out the extent leak code
btrfs: separate out the extent io init function
btrfs: move extent_io_tree defs to their own header
btrfs: export find_delalloc_range
btrfs: move the failrec tree stuff into extent-io-tree.h
btrfs: use refcount_inc_not_zero in kill_all_nodes
btrfs: check page->mapping when loading free space cache
btrfs: use btrfs_block_group_cache_done in update_block_group
btrfs: record all roots for rename exchange on a subvol

Marcos Paulo de Souza (2):
btrfs: block-group: Rework documentation of check_system_chunk function
btrfs: ioctl: Try to use btrfs_fs_info instead of *file

Nikolay Borisov (17):
btrfs: Add assert to catch nested transaction commit
btrfs: Don't opencode btrfs_find_name_in_backref in backref_in_log
btrfs: Properly handle backref_in_log retval
btrfs: Open-code name_in_log_ref in replay_one_name
btrfs: User assert to document transaction requirement
btrfs: Rename btrfs_join_transaction_nolock
btrfs: Speed up btrfs_file_llseek
btrfs: Simplify btrfs_file_llseek
btrfs: Return offset from find_desired_extent
btrfs: Cleanup and simplify find_newest_super_backup
btrfs: Remove newest_gen argument from find_oldest_super_backup
btrfs: Add read_backup_root
btrfs: Factor out tree roots initialization during mount
btrfs: Don't use objectid_mutex during mount
btrfs: Remove unused next_root_backup function
btrfs: Rename find_oldest_super_backup to init_backup_root_slot
btrfs: Streamline btrfs_fs_info::backup_root_index semantics

Omar Sandoval (7):
btrfs: get rid of unnecessary memset() of work item
btrfs: don't prematurely free work in run_ordered_work()
btrfs: don't prematurely free work in end_workqueue_fn()
btrfs: don't prematurely free work in reada_start_machine_worker()
btrfs: don't prematurely free work in scrub_missing_raid56_worker()
btrfs: get rid of unique workqueue helper functions
btrfs: get rid of pointless wtag variable in async-thread.c

Qu Wenruo (16):
btrfs: tree-checker: Try to detect missing INODE_ITEM
btrfs: tree-checker: Add check for INODE_REF
btrfs: ctree: Reduce one indent level for btrfs_search_slot()
btrfs: ctree: Reduce one indent level for btrfs_search_old_slot()
btrfs: ctree: Remove stray comment of setting up path lock
btrfs: transaction: describe transaction states and transitions
btrfs: transaction: Cleanup unused TRANS_STATE_BLOCKED
btrfs: tree-checker: Refactor prev_key check for ino into a function
btrfs: Enhance error output for write time tree checker
btrfs: Remove btrfs_bio::flags member
btrfs: tree-checker: Check item size before reading file extent type
btrfs: volumes: Use more straightforward way to calculate map length
btrfs: Ensure we trim ranges across block group boundary
btrfs: block-group: Refactor btrfs_read_block_groups()
btrfs: block-group: Reuse the item key from caller of read_one_block_group()
btrfs: scrub: Don't check free space before marking a block group RO

Tejun Heo (1):
btrfs: Avoid getting stuck during cyclic writebacks

fs/btrfs/Kconfig | 2 +
fs/btrfs/async-thread.c | 113 +++----
fs/btrfs/async-thread.h | 37 +--
fs/btrfs/block-group.c | 589 +++++++++++++++++----------------
fs/btrfs/block-group.h | 51 +--
fs/btrfs/btrfs_inode.h | 3 -
fs/btrfs/compression.c | 269 +++++++++++----
fs/btrfs/compression.h | 46 +--
fs/btrfs/ctree.c | 287 +++++++---------
fs/btrfs/ctree.h | 51 +--
fs/btrfs/delalloc-space.c | 21 +-
fs/btrfs/delayed-inode.c | 18 +-
fs/btrfs/dev-replace.c | 2 +-
fs/btrfs/dev-replace.h | 2 +-
fs/btrfs/disk-io.c | 365 ++++++++++----------
fs/btrfs/disk-io.h | 4 +-
fs/btrfs/export.c | 4 +-
fs/btrfs/extent-io-tree.h | 248 ++++++++++++++
fs/btrfs/extent-tree.c | 146 ++++----
fs/btrfs/extent_io.c | 120 ++++---
fs/btrfs/extent_io.h | 231 +------------
fs/btrfs/extent_map.c | 6 +-
fs/btrfs/extent_map.h | 11 +-
fs/btrfs/file-item.c | 1 -
fs/btrfs/file.c | 74 ++---
fs/btrfs/free-space-cache.c | 118 +++----
fs/btrfs/free-space-cache.h | 39 +--
fs/btrfs/free-space-tree.c | 133 ++++----
fs/btrfs/free-space-tree.h | 18 +-
fs/btrfs/inode.c | 170 ++++++----
fs/btrfs/ioctl.c | 49 ++-
fs/btrfs/locking.c | 309 ++++++++++++++---
fs/btrfs/locking.h | 13 +-
fs/btrfs/lzo.c | 53 +--
fs/btrfs/misc.h | 11 +
fs/btrfs/ordered-data.c | 7 +-
fs/btrfs/ordered-data.h | 2 +-
fs/btrfs/print-tree.c | 6 +-
fs/btrfs/props.c | 6 +-
fs/btrfs/qgroup.c | 11 +-
fs/btrfs/qgroup.h | 2 +-
fs/btrfs/raid56.c | 101 +++---
fs/btrfs/reada.c | 19 +-
fs/btrfs/relocation.c | 43 ++-
fs/btrfs/scrub.c | 100 +++---
fs/btrfs/send.c | 45 ++-
fs/btrfs/space-info.c | 8 +-
fs/btrfs/space-info.h | 3 +-
fs/btrfs/super.c | 26 +-
fs/btrfs/sysfs.c | 47 ++-
fs/btrfs/sysfs.h | 2 +-
fs/btrfs/tests/btrfs-tests.c | 11 +-
fs/btrfs/tests/btrfs-tests.h | 4 +-
fs/btrfs/tests/free-space-tests.c | 15 +-
fs/btrfs/tests/free-space-tree-tests.c | 101 +++---
fs/btrfs/transaction.c | 98 +++++-
fs/btrfs/transaction.h | 5 +-
fs/btrfs/tree-checker.c | 211 +++++++++---
fs/btrfs/tree-log.c | 136 ++++----
fs/btrfs/volumes.c | 494 ++++++++-------------------
fs/btrfs/volumes.h | 24 +-
fs/btrfs/zlib.c | 52 +--
fs/btrfs/zstd.c | 47 +--
include/trace/events/btrfs.h | 131 ++++----
include/uapi/linux/btrfs.h | 5 +-
include/uapi/linux/btrfs_tree.h | 23 +-
66 files changed, 2780 insertions(+), 2619 deletions(-)
create mode 100644 fs/btrfs/extent-io-tree.h

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