Merge tag 'for-7.2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "The most noticeable change is to enable large folios by default, it's
  been in testing for a few releases. Related to that is huge folio
  support (still under experimental config). Otherwise a few ioctl
  updates, performance improvements and usual fixes and core changes.

  User visible changes:

   - enable large folios by default, added in 6.17 (under experimental
     build), no feature limitations, a big change internally

   - new ioctl to return raw checksums to userspace (a bit tricky given
     compression and tail extents), can be used for mkfs and
     deduplication optimizations

   - provide stable UUID for e.g. overlayfs and temp_fsid, also
     reflected in statvfs() field f_fsid, internal dev_t is hashed in to
     allow cloning

   - add 32bit compat version of GET_SUBVOL_INFO ioctl

   - in experimental build, support huge folios (up to 2M)

  Performance related improvements/changes:

   - limit bio size to the estimated optimum derived from the queue,
     this prevents build up of too much data for writeback, which could
     cause latency spikes (reported improvement 15% on sequential
     writes)

   - don't force direct IO to be serialized, forgotten change during
     mount API port, brings back +60% of throughput

   - lockless calculation of number of shrinkable extent maps, improve
     performance with many memcg allocated objects

  Notable fixes:

   - in zoned mode, fix a deadlock due to zone reclaim and relocation
     when space needs to be flushed

   - don't trim device which is internally not tracked as writeable
     (e.g. when missing device is being rescanned)

   - fix deadlock when cloning inline extent and mounted with
     flushoncommit

   - fix false IO failures after direct IO falls back to buffered write
     in some cases

  Core:

   - remove COW fixup mechanism completely; detect and fix changes to
     pages outside of filesystem tracking, guaranteed since 5.8, grace
     period is over

   - remove 2K block size support, experimental to test subpage code on
     x86_64 but now it would block folio changes

   - tree-checker improvements of:
      - free-space cache and tree items
      - root reference and backref items
      - extent state exceptions in reloc tree

   - subpage mode updates:
      - code optimizations, simplify tracking bitmaps
      - re-enable readahead of compressed extent
      - extend bitmap size to cover huge folios

   - add tracepoints related to sync, tree-log and transactions

   - device stats item tracking unification, remove item if there are no
     stats recorded, also don't leave stale stats on replaced device

   - allow extent buffer pages to be allocated as movable, to help page
     migration

   - added checks for proper extent buffer release

   - btrfs.ko code size reduction due to transaction abort call
     simplifications

   - several struct size reductions

   - more auto free conversions

   - more verbose assertions"

* tag 'for-7.2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (130 commits)
  btrfs: fix use-after-free after relocation failure with concurrent COW
  btrfs: move WARN_ON on unexpected error in __add_tree_block()
  btrfs: move locking into btrfs_get_reloc_bg_bytenr()
  btrfs: lzo: reject compressed segment that overflows the compressed input
  btrfs: retry faulting in the pages after a zero sized short direct write
  btrfs: fix incorrect buffered IO fallback for append direct writes
  btrfs: fix false IO failure after falling back to buffered write
  btrfs: use verbose assertions in backref.c
  btrfs: print a message when a missing device re-appears
  btrfs: do not trim a device which is not writeable
  btrfs: return real error after lookup failure in btrfs_ioctl_default_subvol()
  btrfs: use mapping shared locking for reading super block
  btrfs: use lockless read in nr_cached_objects shrinker callback
  btrfs: switch local indicator variables to bools
  btrfs: send: pass bool for pending_move and refs_processed parameters
  btrfs: use shifts for sectorsize and nodesize
  btrfs: fix deadlock cloning inline extent when using flushoncommit
  btrfs: allocate eb-attached btree pages as movable
  btrfs: add 32-bit compat ioctl for BTRFS_IOC_GET_SUBVOL_INFO
  btrfs: derive f_fsid from on-disk fsid and dev_t
  ...

include/uapi/linux/btrfs.h

@@ -1100,6 +1100,38 @@ enum btrfs_err_code {
 	BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET,
 };
 
+/* Flags for struct btrfs_ioctl_get_csums_entry::type. */
+#define BTRFS_GET_CSUMS_HAS_CSUMS			(1U << 0)
+#define BTRFS_GET_CSUMS_ZEROED				(1U << 1)
+#define BTRFS_GET_CSUMS_NODATASUM			(1U << 2)
+#define BTRFS_GET_CSUMS_COMPRESSED			(1U << 3)
+#define BTRFS_GET_CSUMS_ENCRYPTED			(1U << 4)
+#define BTRFS_GET_CSUMS_INLINE				(1U << 5)
+
+struct btrfs_ioctl_get_csums_entry {
+	/* File offset of this range. */
+	__u64 offset;
+	/* Length in bytes. */
+	__u64 length;
+	/* One of BTRFS_GET_CSUMS_* types. */
+	__u32 type;
+	/* Padding, must be 0. */
+	__u32 reserved;
+};
+
+struct btrfs_ioctl_get_csums_args {
+	/* In/out: file offset in bytes. */
+	__u64 offset;
+	/* In/out: range length in bytes. */
+	__u64 length;
+	/* In/out: buffer capacity / bytes written. */
+	__u64 buf_size;
+	/* In: flags, must be 0 for now. */
+	__u64 flags;
+	/* Out: entries of type btrfs_ioctl_get_csums_entry + csum data */
+	__u8 buf[];
+};
+
 /* Flags for IOC_SHUTDOWN, must match XFS_FSOP_GOING_FLAGS_* flags. */
 #define BTRFS_SHUTDOWN_FLAGS_DEFAULT			0x0
 #define BTRFS_SHUTDOWN_FLAGS_LOGFLUSH			0x1
@@ -1226,6 +1258,8 @@ enum btrfs_err_code {
 				     struct btrfs_ioctl_encoded_io_args)
 #define BTRFS_IOC_SUBVOL_SYNC_WAIT _IOW(BTRFS_IOCTL_MAGIC, 65, \
 					struct btrfs_ioctl_subvol_wait)
+#define BTRFS_IOC_GET_CSUMS _IOWR(BTRFS_IOCTL_MAGIC, 66, \
+				  struct btrfs_ioctl_get_csums_args)
 
 /* Shutdown ioctl should follow XFS's interfaces, thus not using btrfs magic. */
 #define BTRFS_IOC_SHUTDOWN	_IOR('X', 125, __u32)