btrfs-progs: docs: update kernel feature updates 6.13..6.17

[ci skip]

Signed-off-by: David Sterba <[email protected]>

Author: kdave

Documentation/Feature-by-version.rst

@@ -193,7 +193,61 @@ features see :doc:`Status<Status>` page.
         not touch the superblock read-only status, preventing removal of
         accumulated deleted snapshots to be cleaned.
 
-6.13 - update tree-checker to detect more wrong inline extent references
+6.13 - tree-checker update for inline extent references
+        Update tree-checker to detect more wrong inline extent references.
+
+6.14 - support READ_VERITY_METADATA ioctl
+        Add support for FS_IOC_READ_VERITY_METADATA to directly query the
+        Merkle tree, descriptor and signature blocks for fs-verity enabled
+        files.
+
+6.14 - *experimental* read balancing policies
+        Add more read balancing policies, configurable in :file:`/sys/fs/btrfs/FSID/read_policy`
+        or as module parameter *read_policy*.  Newly added *round-robin*,
+        *devid:N* (select a specific mirror number *N*).
+
+6.14 - encoded write integration with io_uring
+        The io_uring subsystem understands a command that is directed to
+        Btrfs encoded write ioctl.
+
+6.15 - always do buffered IO for files with checksums
+        Direct IO may lead to data and their checksums mismatch. Use the direct
+        to buffered fallback in case the file has checksums. This has a negative
+        performance impact.
+
+6.15 - negative (fast) levels for zstd
+        Mount options for *zstd* compression accept negative values *-1..-15*
+        match the levels. They provide faster compression at the cost of worse
+        ratio.
+
+6.15 - *(debug builds)* accept 2K block size on x86_64
+        For testing the *subpage* block size feature, the size of 2K is accepted
+        on x86_64 which has 4K pages.
+
+6.15 - defrag ioctl accepts negative zstd levels
+        The defrag ioctl also accepts the negative zstd levels that can be set as
+        mount option.
+
+6.17 - track current commit duration in commit_stats
+        Add entry to :file:`commit_stats` to detect commit stalls, for
+        debugging or monitoring purposes.
+
+6.17 - *experimental* large folio support
+        Large folios abstract contiguous page ranges representing some filesystem
+        data or metadata as one structure instead of several ones. This simplifies
+        code and has a positive impact on performance. As it touches the core
+        data structure it is not enabled by default.
+
+6.17 - restrict writes to mounted devices
+        Any btrfs mounted device cannot be opened for writes.
+
+6.17 - defrag ioctl can force no compression
+        The defrag ioctl was not able to uncompress a given range, now it's
+        possible.
+
+6.17 - send (v2 protocol) uses fallocate for hole punching
+        File holes, ranges not representing data, were emulated by a zero
+        filled data. This is less efficient than puching holes.
 
 5.x
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