zygo: cherry-picked up to dd9ef13 (extra args linus/master --remotes=btrfs-next/...

Commits included:

++++ d3e46fe btrfs: sink blocksize parameter to readahead_tree_block
++++ b6ae40e btrfs: remove blocksize from reada_extent
++++ c0dcaa4 btrfs: sink blocksize parameter to reada_tree_block_flagged
++++ fe86457 btrfs: sink blocksize parameter to btrfs_init_new_buffer
++++ a83fffb btrfs: sink blocksize parameter to btrfs_find_create_tree_block
++++ 7476dfd btrfs: sink blocksize parameter to tree_block_processed
++++ 23d79d8 btrfs: use GFP_NOFS in __alloc_extent_buffer directly
++++ 3f556f7 btrfs: unify extent buffer allocation api
++++ ce3e698 btrfs: sink parameter len to alloc_extent_buffer
++++ d43955b Btrfs: change how we track dirty roots
---- fe7944d Btrfs: track dirty block groups on their own list
---- 7031479 Btrfs: abort transaction if we don't find the block group
++++ 83fe27e rcu: Make SRCU optional by using CONFIG_SRCU
---- 381cf65 btrfs: fix leak of path in btrfs_find_item
++++ 14692cc btrfs: cleanup, remove inode_item_info helper
++++ c234a24 btrfs: cleanup, remove inode_ref_info helper
++++ 9c4f61f btrfs: simplify insert_orphan_item
++++ 1d4c08e btrfs: expand btrfs_find_item if found_key is NULL
---- b4caecd fs: introduce f_op->mmap_capabilities for nommu mmap support
++++ de1414a fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info
---- b83ae6d fs: remove mapping->backing_dev_info
---- df0ce26 fs: remove default_backing_dev_info
---- e7070be Btrfs: change how we track dirty roots
++++ ce93ec5 Btrfs: track dirty block groups on their own list
++++ a8df6fe Btrfs: fix setup_leaf_for_split() to avoid leaf corruption
++++ 68b663d btrfs: update message levels for errors
++++ aa8ee31 btrfs: update message levels during failed mount
++++ f0954c6 btrfs: update message levels after checksum errors
---- 5efa049 btrfs: set proper message level for skinny metadata
++++ 9ee49a04 btrfs: switch extent_state state to unsigned
++++ 730a78c btrfs: remove a no-op unfreeze superbock callback
++++ 6219872 Btrfs: lookup for block group only if needed when freeing a tree block
++++ d36808e Btrfs: fix directory inconsistency after fsync log replay
++++ 2c2c452 Btrfs: fix fsync when extend references are added to an inode
++++ df8d116 Btrfs: fix fsync log replay for inodes with a mix of regular refs and extrefs
++++ e34c330 Btrfs: fix a out-of-bound access of raid_map
++++ cc7539e Btrfs: sort raid_map before adding tgtdev stripes
++++ 8e5cfb5 Btrfs: Make raid_map array be inlined in btrfs_bio structure
++++ 6e9606d Btrfs: add ref_count and free function for btrfs_bio
++++ b25c94c Btrfs: Fix a jump typo of nodatasum_case to avoid wrong WARN_ON()
++++ 114ab50 Btrfs: Remove noneed force_write in scrub_write_block_to_dev_replace
++++ 09dd7a0 Btrfs: Cleanup btrfs_bio_counter_inc_blocked()
++++ 7653947 Btrfs: btrfs_rm_dev_replace_blocked(): Use wait_event()
++++ dc5f7a3 Btrfs: Break loop when reach BTRFS_MAX_MIRRORS in scrub_setup_recheck_block()
++++ 8d6738c Btrfs: Separate finding-right-mirror and writing-to-target's process in scrub_handle_errored_block()
++++ b968fed Btrfs: Combine per-page recover in dev-replace and scrub
++++ be50a8d Btrfs: Simplify scrub_setup_recheck_block()'s argument
++++ 10f1190 Btrfs: Include map_type in raid_bio
++++ ffe2d20 Btrfs: Introduce BTRFS_BLOCK_GROUP_RAID56_MASK to check raid56 simply
++++ 5701934 Rename all ref_count to refs in struct
++++ 26455d3 Btrfs: cleanup unused run_most
++++ 0ee13fe btrfs: qgroup: move WARN_ON() to the correct location.
++++ 78f55e5 Btrfs: fix unused members in struct btrfs_root
++++ 95449a1 Btrfs: insert_new_root: Fix lock type of the extent buffer.
++++ a937b97 btrfs: kill btrfs_inode_*time helpers
++++ 9cc97d6 Btrfs: Add code to support file creation time
++++ 75d6ad3 btrfs: more superblock checks, lower bounds on devices and sectorsize/nodesize
++++ ce7fca5 btrfs: add checks for sys_chunk_array sizes
++++ 1ffb22c btrfs: cleanup, rename a few variables in btrfs_read_sys_array
++++ e3540ea btrfs: add more checks to btrfs_read_sys_array
++++ d4b450c Btrfs: fix race between transaction commit and empty block group removal
++++ 001a648 Btrfs: add missing cleanup on sysfs init failure
++++ de554a4 Btrfs: fix scrub race leading to use-after-free
++++ 289454a btrfs: clear bio reference after submit_one_bio()
++++ 2f08108 btrfs: delete chunk allocation attemp when setting block group ro
++++ b76808f btrfs: cleanup init for list in free-space-cache
---- d83a08d mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub
++++ 8d38633 page_writeback: put account_page_redirty() after set_page_dirty()
++++ 575849e Btrfs: fix scheduler warning when syncing log
++++ f55985f Btrfs: scrub, fix sleep in atomic context
++++ 13212b5 btrfs: Fix out-of-space bug
++++ 3e05bde Btrfs: only adjust outstanding_extents when we do a short write
++++ 3266789 Btrfs: don't set and clear delalloc for O_DIRECT writes
++++ dcab6a3 Btrfs: account for large extents with enospc
++++ 3d84be7 Btrfs: fix BUG_ON in btrfs_orphan_add() when delete unused block group
---- 1a4bcf4 Btrfs: fix fsync data loss after adding hard link to inode
++++ a742994 Btrfs: don't remove extents and xattrs when logging new names
++++ e57cf21 Btrfs: fix allocation size calculations in alloc_btrfs_bio
---- e36cb0b VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry)
++++ 4d884fc Btrfs: fix fsync race leading to ordered extent memory leaks
++++ 0c0ef4b Btrfs: abort the transaction if we fail to update the free space cache inode
++++ e8c1c76 Btrfs: add missing inode update when punching hole
++++ 5dfe2be Btrfs: fix off-by-one logic error in btrfs_realloc_node
++++ 5cdf83e Btrfs: do not ignore errors from btrfs_lookup_xattr in do_setxattr
++++ 1932b7b btrfs: fix lost return value due to variable shadowing
++++ 84471e2 Btrfs: incremental send, don't rename a directory too soon
++++ f5c0a12 Btrfs: remove extra run_delayed_refs in update_cowonly_root
++++ 3a8b36f Btrfs: fix data loss in the fast fsync path
++++ dd9ef13 Btrfs:__add_inode_ref: out of bounds memory read when looking for extended ref.