Merge tag 'exfat-for-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat

Pull exfat updates from Namjae Jeon:

 - Use the recalculated append position when advancing valid_size, dirty
   all pages involved in valid-data extension, and zero invalid tails on
   partial overwrites. Write-protect the folio spanning the old EOF and
   zero its post-EOF range when extending a file, ensuring subsequent
   mmap writes advance valid_size.

 - Make valid_size and zeroed_size atomic to prevent torn reads and lost
   updates. Hold the invalidate lock during truncation, and drain
   in-flight direct I/O before buffered writes, buffered fallback, and
   page-cache operations that extend valid_size.

 - Fall back to single-cluster allocation when a buffered write cannot
   allocate its entire range, allowing writes to consume the remaining
   free space and return a short count.

 - Free clusters allocated beyond EOF after failed or short writes to
   prevent leaked space and spurious ENOSPC errors on later writes or
   file extensions.

 - Clean block-device buffer aliases when allocating clusters so delayed
   directory metadata writeback cannot overwrite file data after cluster
   reuse.

 - Update used_clusters as each cluster is allocated so
   partial-allocation cleanup keeps free-space accounting consistent.
   Acquire bitmap_lock before checking available space to serialize the
   check with allocation.

 - Use swap-specific iomap operations to report allocated extents beyond
   valid_size as unwritten during swap activation, retaining
   byte-accurate SEEK_HOLE and SEEK_DATA reporting in regular I/O.

 - Check allocation flags, vendor GUIDs, cluster numbers, data lengths,
   and contiguous extents in Vendor Allocation directory entries. Read
   complete entry sets during lookup so malformed trailing entries
   cannot bypass validation.

 - Follow directory FAT chains to their actual end when the recorded
   size is too small, supporting devices that leave directory sizes
   stale. Handle reads after seeking past the directory end.

 - Clear the volume dirty flag during remount only when switching to
   read-only without SB_FORCE. Update percent_in_use when changing
   volume flags, reporting unknown usage while the volume is dirty or
   persistent flags prevent marking it clean.

 - Replace runtime division by powers of two with bit operations.

 - Document supported mount options, and exfatprogs, and add the
   documentation path to MAINTAINERS.

* tag 'exfat-for-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat:
  exfat: fix reading a directory whose FAT chain is longer than its size
  exfat: free clusters beyond EOF when a write fails or is short
  exfat: clean stale bdev buffers of newly allocated clusters
  exfat: mark straddling folio RO and zero the post-EOF range
  exfat: fix a large buffered write failing when the volume is nearly full
  exfat: zero invalid tail on partial overwrites
  exfat: drain in-flight DIO before buffered writes
  exfat: make valid_size and zeroed_size atomic
  exfat: dirty all new pages when extending valid_size
  exfat: hold the invalidate lock while truncating
  exfat: advance valid_size to EOF for append writes
  MAINTAINERS: add exFAT documentation
  exfat: remove runtime integer division
  exfat: update percent_in_use field when updating volume flags
  exfat: clear the volume dirty flag only when remounting read-only
  exfat: doc: add documentation
  exfat: validate vendor allocation directory entries
  exfat: take bitmap_lock at the start of exfat_alloc_cluster()
  exfat: fix used_clusters accounting during cluster allocation
  exfat: map allocated extents for swap activation

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