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Subject[GIT PULL] Btrfs updates for 4.21

I've planned to merge a few more patches to the 1st pull branch that belong to
a core change mentioned below as 'delayed refs reserve'. There are review
comments that I think should be addressed, so the patches are postponed.

Technically they're fixes and I presume it's ok to take them in the -rc. I
didn't want to touch the pull request branch a few days before sending it,
though the patches have been in linux-next for some time. The bugs fixed are
not critical for testing so this should not block anybody.

No merge conflicts, please pull. Thanks.


New features:

* swapfile support - after a long time it's here, with some limitations where
COW design does not work well with the swap implementation (nodatacow file,
no compression, cannot be snapshotted, not possible on multiple devices,
...), as this is the most restricted but working setup, we'll try to improve
that in the future

* metadata uuid - an optional incompat feature to assign a new filesystem UUID
without overwriting all metadata blocks, stored only in superblock

* more balance messages are printed to system log, initial is in the format of
the command line that would be used to start it


* tag pages of a snapshot to better separate pages that are involved in the
snapshot (and need to get synced) from newly dirtied pages that could slow
down or even livelock the snapshot operation

* improved check of filesystem id associated with a device during scan to
detect duplicate devices that could be mixed up during mount

* fix device replace state transitions, eg. when it ends up interrupted and
reboot tries to restart balance too, or when start/cancel ioctls race

* fix a crash due to a race when quotas are enabled during snapshot creation

* GFP_NOFS/memalloc_nofs_* fixes due to GFP_KERNEL allocations in transaction

* fix fsync of files with multiple hard links in new directories

* fix race of send with transaction commits that create snapshots

Core changes:

* cleanups
* further removals of now-dead fsync code
* core function for finding free extent has been split and provides a base
for further cleanups to make the logic more understandable
* removed lot of indirect callbacks for data and metadata inodes
* simplified refcounting and locking for cloned extent buffers
* removed redundant function arguments
* defines converted to enums where appropriate

* separate reserve for delayed refs from global reserve, update logic to do
less trickery and ad-hoc heuristics, move out some related expensive
operations from transaction commit or file truncate

* dev-replace switched from custom locking scheme to semaphore

* remove first phase of balance that tried to make some space for the
relocation by calling shrink and grow, this did not work as expected and only
introduced more error states due to potential resize failures, slightly
improves the runtime as the chunks on all devices are not needlessly

* clone and deduplication now use generic helper that adds a few more checks
that were missing from the original btrfs implementation of the ioctls

The following changes since commit 7566ec393f4161572ba6f11ad5171fd5d59b0fbd:

Linux 4.20-rc7 (2018-12-16 15:46:55 -0800)

are available in the Git repository at:

git:// for-4.21-tag

for you to fetch changes up to 52042d8e82ff50d40e76a275ac0b97aa663328b0:

btrfs: Fix typos in comments and strings (2018-12-17 14:51:50 +0100)

Anand Jain (14):
btrfs: remove redundant replace_state init
btrfs: harden agaist duplicate fsid on scanned devices
btrfs: mark btrfs_dev_replace_start as static
btrfs: dev-replace: go back to suspended state if target device is missing
btrfs: dev-replace: go back to suspend state if another EXCL_OP is running
btrfs: fix use-after-free due to race between replace start and cancel
btrfs: dev-replace: set result code of cancel by status of scrub
btrfs: dev-replace: replace's scrub must not be running in suspended state
btrfs: dev-replace: add explicit check for replace result "no error"
btrfs: silence warning if replace is canceled
btrfs: don't report user-requested cancel as an error
btrfs: add helper to describe block group flags
btrfs: balance: print args during start and resume
btrfs: balance: print to system log when balance ends or is paused

Andrea Gelmini (1):
btrfs: Fix typos in comments and strings

David Sterba (18):
btrfs: merge btrfs_submit_bio_done to its caller
btrfs: replace async_cow::root with fs_info
btrfs: remove redundant csum buffer in btrfs_io_bio
btrfs: replace btrfs_io_bio::end_io with a simple helper
btrfs: switch BTRFS_FS_STATE_* to enums
btrfs: switch BTRFS_BLOCK_RSV_* to enums
btrfs: switch BTRFS_FS_* to enums
btrfs: switch BTRFS_ROOT_* to enums
btrfs: switch EXTENT_BUFFER_* to enums
btrfs: switch EXTENT_FLAG_* to enums
btrfs: switch BTRFS_ORDERED_* to enums
btrfs: drop extra enum initialization where using defaults
btrfs: reada: reorder dev-replace locks before radix tree preload
btrfs: dev-replace: swich locking to rw semaphore
btrfs: dev-replace: remove custom read/write blocking scheme
btrfs: dev-replace: open code trivial locking helpers
btrfs: scrub: pass fs_info to scrub_setup_ctx
btrfs: scrub: move scrub_setup_ctx allocation out of device_list_mutex

Ethan Lien (1):
btrfs: use tagged writepage to mitigate livelock of snapshot

Filipe Manana (13):
Btrfs: remove no longer used logged range variables when logging extents
Btrfs: remove no longer used stuff for tracking pending ordered extents
Btrfs: simpler and more efficient cleanup of a log tree's extent io tree
Btrfs: remove no longer used io_err from btrfs_log_ctx
Btrfs: allow clear_extent_dirty() to receive a cached extent state record
Btrfs: fix access to available allocation bits when starting balance
Btrfs: fix deadlock when enabling quotas due to concurrent snapshot creation
Btrfs: fix deadlock with memory reclaim during scrub
Btrfs: fix fsync of files with multiple hard links in new directories
Btrfs: scrub, move setup of nofs contexts higher in the stack
Btrfs: use nofs context when initializing security xattrs to avoid deadlock
Btrfs: send, fix race with transaction commits that create snapshots
Btrfs: use generic_remap_file_range_prep() for cloning and deduplication

Hans van Kranenburg (5):
btrfs: alloc_chunk: do not refurbish num_bytes
btrfs: alloc_chunk: improve chunk size variable name
btrfs: alloc_chunk: fix more DUP stripe size handling
btrfs: fix ncopies raid_attr for RAID56
btrfs: introduce nparity raid_attr

Johannes Thumshirn (9):
btrfs: remove unused drop_on_err in btrfs_mkdir
btrfs: introduce EXPORT_FOR_TESTS macro
btrfs: use EXPORT_FOR_TESTS for conditionally exported functions
btrfs: remove btrfs_bio_end_io_t
btrfs: don't initialize 'offset' in map_private_extent_buffer()
btrfs: document extent mapping assumptions in checksum
btrfs: use offset_in_page instead of open-coding it
btrfs: use PAGE_ALIGNED instead of open-coding it
btrfs: improve error handling of btrfs_add_link

Josef Bacik (12):
btrfs: add btrfs_delete_ref_head helper
btrfs: add cleanup_ref_head_accounting helper
btrfs: cleanup extent_op handling
btrfs: only track ref_heads in delayed_ref_updates
btrfs: introduce delayed_refs_rsv
btrfs: update may_commit_transaction to use the delayed refs rsv
btrfs: add new flushing states for the delayed refs rsv
btrfs: rework btrfs_check_space_for_delayed_refs
btrfs: don't run delayed refs in the end transaction logic
btrfs: fix truncate throttling
btrfs: catch cow on deleting snapshots
btrfs: run delayed items before dropping the snapshot

Lu Fengqi (4):
btrfs: extent-tree: Detect bytes_pinned underflow earlier
btrfs: cleanup the useless DEFINE_WAIT in cleanup_transaction
btrfs: skip file_extent generation check for free_space_inode in run_delalloc_nocow
btrfs: remove always true if branch in find_delalloc_range

Nikolay Borisov (36):
btrfs: Add function to distinguish between data and btree inode
btrfs: Remove extent_io_ops::fill_delalloc
btrfs: Remove extent_io_ops::writepage_start_hook
btrfs: Remove extent_io_ops::writepage_end_io_hook
btrfs: Remove extent_io_ops::check_extent_io_range callback
btrfs: Remove extent_io_ops::set_bit_hook extent_io callback
btrfs: Remove extent_io_ops::clear_bit_hook callback
btrfs: Remove extent_io_ops::merge_extent_hook callback
btrfs: Remove extent_io_ops::split_extent_hook callback
btrfs: Remove needless tree locking in iterate_inode_refs
btrfs: Remove needless tree locking in iterate_inode_extrefs
btrfs: Remove redundant extent_buffer_get in get_old_root
btrfs: Remove extraneous extent_buffer_get from tree_mod_log_rewind
btrfs: Remove extra reference count bumps in btrfs_compare_trees
btrfs: Remove unnecessary tree locking code in qgroup_rescan_leaf
btrfs: Remove special handling of EXTENT_BUFFER_UNMAPPED while freeing
btrfs: Adjust loop in free_extent_buffer
btrfs: Check for missing device before bio submission in btrfs_map_bio
btrfs: Move epd::extent_locked check to writepage_delalloc's caller
btrfs: Remove extent_page_data argument from writepage_delalloc
btrfs: Remove unused extent_state argument from btrfs_writepage_endio_finish_ordered
btrfs: Remove superfluous check form btrfs_remove_chunk
btrfs: Sink find_lock_delalloc_range's 'max_bytes' argument
btrfs: Replace BUG_ON with ASSERT in find_lock_delalloc_range
btrfs: Introduce support for FSID change without metadata rewrite
btrfs: Add sysfs support for metadata_uuid feature
btrfs: Remove fsid/metadata_fsid fields from btrfs_info
btrfs: Add handling for disk split-brain scenario during fsid change
btrfs: add members to fs_devices to track fsid changes
btrfs: Handle one more split-brain scenario during fsid change
btrfs: Handle final split-brain possibility during fsid change
btrfs: Remove extent_io_ops::readpage_io_failed_hook
btrfs: Refactor btrfs_merge_bio_hook
btrfs: Fix error handling in btrfs_cleanup_ordered_extents
btrfs: Remove 1st shrink/grow phase from balance
btrfs: Refactor main loop in extent_readpages

Omar Sandoval (3):
Btrfs: prevent ioctls from interfering with a swap file
Btrfs: rename and export get_chunk_map
Btrfs: support swap files

Qu Wenruo (9):
btrfs: extent-tree: Detect bytes_may_use underflow earlier
btrfs: Introduce find_free_extent_ctl structure for later rework
btrfs: Refactor clustered extent allocation into find_free_extent_clustered
btrfs: Refactor unclustered extent allocation into find_free_extent_unclustered()
btrfs: Refactor find_free_extent loops update into find_free_extent_update_loop
btrfs: volumes: Make sure there is no overlap of dev extents at mount time
btrfs: volumes: Make sure no dev extent is beyond device boundary
btrfs: tests: Use BTRFS_MAX_EXTENT_SIZE to replace the intermediate number
btrfs: extent-tree: cleanup one-shot usage of @blocksize in do_walk_down

fs/btrfs/backref.c | 13 +-
fs/btrfs/btrfs_inode.h | 14 +-
fs/btrfs/check-integrity.c | 24 +-
fs/btrfs/compression.c | 26 +-
fs/btrfs/ctree.c | 46 +-
fs/btrfs/ctree.h | 263 +++++---
fs/btrfs/delayed-ref.c | 61 +-
fs/btrfs/delayed-ref.h | 3 +-
fs/btrfs/dev-replace.c | 191 +++---
fs/btrfs/dev-replace.h | 8 -
fs/btrfs/disk-io.c | 117 ++--
fs/btrfs/disk-io.h | 10 +-
fs/btrfs/extent-tree.c | 1254 ++++++++++++++++++++++++--------------
fs/btrfs/extent_io.c | 414 ++++++-------
fs/btrfs/extent_io.h | 66 +-
fs/btrfs/extent_map.c | 3 +-
fs/btrfs/extent_map.h | 21 +-
fs/btrfs/file-item.c | 13 +-
fs/btrfs/file.c | 29 +-
fs/btrfs/free-space-tree.c | 15 +-
fs/btrfs/inode.c | 665 ++++++++++++++------
fs/btrfs/ioctl.c | 643 +++++--------------
fs/btrfs/lzo.c | 2 +-
fs/btrfs/ordered-data.c | 30 -
fs/btrfs/ordered-data.h | 47 +-
fs/btrfs/qgroup.c | 35 +-
fs/btrfs/qgroup.h | 6 +-
fs/btrfs/raid56.c | 2 +-
fs/btrfs/reada.c | 16 +-
fs/btrfs/ref-verify.c | 6 +-
fs/btrfs/relocation.c | 50 +-
fs/btrfs/scrub.c | 85 ++-
fs/btrfs/send.c | 6 +-
fs/btrfs/super.c | 10 +-
fs/btrfs/sysfs.c | 14 +
fs/btrfs/sysfs.h | 2 +-
fs/btrfs/tests/btrfs-tests.c | 4 +-
fs/btrfs/tests/extent-io-tests.c | 29 +-
fs/btrfs/tests/inode-tests.c | 6 -
fs/btrfs/transaction.c | 93 ++-
fs/btrfs/transaction.h | 16 +-
fs/btrfs/tree-checker.c | 6 +-
fs/btrfs/tree-log.c | 44 +-
fs/btrfs/tree-log.h | 2 -
fs/btrfs/volumes.c | 779 +++++++++++++++++------
fs/btrfs/volumes.h | 25 +-
fs/btrfs/xattr.c | 8 +
include/trace/events/btrfs.h | 4 +-
include/uapi/linux/btrfs.h | 1 +
include/uapi/linux/btrfs_tree.h | 1 +
50 files changed, 3030 insertions(+), 2198 deletions(-)

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