Merge tag 'f2fs-for-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs updates from Jaegeuk Kim:
 "This focuses on two primary updates for Android devices.

  First, it sets hash-based file name lookup as the default method to
  improve performance, while retaining an option to fall back to a
  linear lookup.

  Second, it resolves a persistent issue with the 'checkpoint=enable'
  feature.

  The update further boosts performance by prefetching node blocks,
  merging FUA writes more efficiently, and optimizing block allocation
  policies.

  The release is rounded out by a comprehensive set of bug fixes that
  address memory safety, data integrity, and potential system hangs,
  along with minor documentation and code clean-ups.

  Enhancements:
   - add mount option and sysfs entry to tune the lookup mode
   - dump more information and add a timeout when enabling/disabling
     checkpoints
   - readahead node blocks in F2FS_GET_BLOCK_PRECACHE mode
   - merge FUA command with the existing writes
   - allocate HOT_DATA for IPU writes
   - Use allocate_section_policy to control write priority in
     multi-devices setups
   - add reserved nodes for privileged users
   - Add bggc_io_aware to adjust the priority of BG_GC when issuing IO
   - show the list of donation files

  Bug fixes:
   - add missing dput() when printing the donation list
   - fix UAF issue in f2fs_merge_page_bio()
   - add sanity check on ei.len in __update_extent_tree_range()
   - fix infinite loop in __insert_extent_tree()
   - fix zero-sized extent for precache extents
   - fix to mitigate overhead of f2fs_zero_post_eof_page()
   - fix to avoid migrating empty section
   - fix to truncate first page in error path of f2fs_truncate()
   - fix to update map->m_next_extent correctly in f2fs_map_blocks()
   - fix wrong layout information on 16KB page
   - fix to do sanity check on node footer for non inode dnode
   - fix to avoid NULL pointer dereference in
     f2fs_check_quota_consistency()
   - fix to detect potential corrupted nid in free_nid_list
   - fix to clear unusable_cap for checkpoint=enable
   - fix to zero data after EOF for compressed file correctly
   - fix to avoid overflow while left shift operation
   - fix condition in __allow_reserved_blocks()"

* tag 'f2fs-for-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (43 commits)
  f2fs: add missing dput() when printing the donation list
  f2fs: fix UAF issue in f2fs_merge_page_bio()
  f2fs: readahead node blocks in F2FS_GET_BLOCK_PRECACHE mode
  f2fs: add sanity check on ei.len in __update_extent_tree_range()
  f2fs: fix infinite loop in __insert_extent_tree()
  f2fs: fix zero-sized extent for precache extents
  f2fs: fix to mitigate overhead of f2fs_zero_post_eof_page()
  f2fs: fix to avoid migrating empty section
  f2fs: fix to truncate first page in error path of f2fs_truncate()
  f2fs: fix to update map->m_next_extent correctly in f2fs_map_blocks()
  f2fs: fix wrong layout information on 16KB page
  f2fs: clean up error handing of f2fs_submit_page_read()
  f2fs: avoid unnecessary folio_clear_uptodate() for cleanup
  f2fs: merge FUA command with the existing writes
  f2fs: allocate HOT_DATA for IPU writes
  f2fs: Use allocate_section_policy to control write priority in multi-devices setups
  Documentation: f2fs: Reword title
  Documentation: f2fs: Indent compression_mode option list
  Documentation: f2fs: Wrap snippets in literal code blocks
  Documentation: f2fs: Span write hint table section rows
  ...

1 files changed, 53 insertions, 3 deletions

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index bc0e7fefc39d..b590809869ca 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -822,8 +822,8 @@ What:		/sys/fs/f2fs/<disk>/gc_valid_thresh_ratio
 Date:		September 2024
 Contact:	"Daeho Jeong" <daehojeong@google.com>
 Description:	It controls the valid block ratio threshold not to trigger excessive GC
-		for zoned deivces. The initial value of it is 95(%). F2FS will stop the
-		background GC thread from intiating GC for sections having valid blocks
+		for zoned devices. The initial value of it is 95(%). F2FS will stop the
+		background GC thread from initiating GC for sections having valid blocks
 		exceeding the ratio.
 
 What:		/sys/fs/f2fs/<disk>/max_read_extent_count
@@ -847,7 +847,7 @@ Description:	For several zoned storage devices, vendors will provide extra space
 		filesystem level GC. To do that, we can reserve the space using
 		reserved_blocks. However, it is not enough, since this extra space should
 		not be shown to users. So, with this new sysfs node, we can hide the space
-		by substracting reserved_blocks from total bytes.
+		by subtracting reserved_blocks from total bytes.
 
 What:		/sys/fs/f2fs/<disk>/encoding_flags
 Date:		April 2025
@@ -883,3 +883,53 @@ Date:		June 2025
 Contact:	"Daeho Jeong" <daehojeong@google.com>
 Description:	Control GC algorithm for boost GC. 0: cost benefit, 1: greedy
 		Default: 1
+
+What:		/sys/fs/f2fs/<disk>/effective_lookup_mode
+Date:		August 2025
+Contact:	"Daniel Lee" <chullee@google.com>
+Description:
+		This is a read-only entry to show the effective directory lookup mode
+		F2FS is currently using for casefolded directories.
+		This considers both the "lookup_mode" mount option and the on-disk
+		encoding flag, SB_ENC_NO_COMPAT_FALLBACK_FL.
+
+		Possible values are:
+		- "perf": Hash-only lookup.
+		- "compat": Hash-based lookup with a linear search fallback enabled
+		- "auto:perf": lookup_mode is auto and fallback is disabled on-disk
+		- "auto:compat": lookup_mode is auto and fallback is enabled on-disk
+
+What:		/sys/fs/f2fs/<disk>/bggc_io_aware
+Date:		August 2025
+Contact:	"Liao Yuanhong" <liaoyuanhong@vivo.com>
+Description:	Used to adjust the BG_GC priority when pending IO, with a default value
+		of 0. Specifically, for ZUFS, the default value is 1.
+
+		==================  ======================================================
+		value				description
+		bggc_io_aware = 0   skip background GC if there is any kind of pending IO
+		bggc_io_aware = 1   skip background GC if there is pending read IO
+		bggc_io_aware = 2   don't aware IO for background GC
+		==================  ======================================================
+
+What:		/sys/fs/f2fs/<disk>/allocate_section_hint
+Date:		August 2025
+Contact:	"Liao Yuanhong" <liaoyuanhong@vivo.com>
+Description:	Indicates the hint section between the first device and others in multi-devices
+		setup. It defaults to the end of the first device in sections. For a single storage
+		device, it defaults to the total number of sections. It can be manually set to match
+		scenarios where multi-devices are mapped to the same dm device.
+
+What:		/sys/fs/f2fs/<disk>/allocate_section_policy
+Date:		August 2025
+Contact:	"Liao Yuanhong" <liaoyuanhong@vivo.com>
+Description:	Controls write priority in multi-devices setups. A value of 0 means normal writing.
+		A value of 1 prioritizes writing to devices before the allocate_section_hint. A value of 2
+		prioritizes writing to devices after the allocate_section_hint. The default is 0.
+
+		===========================  ==========================================================
+		value					     description
+		allocate_section_policy = 0  Normal writing
+		allocate_section_policy = 1  Prioritize writing to section before allocate_section_hint
+		allocate_section_policy = 2  Prioritize writing to section after allocate_section_hint
+		===========================  ==========================================================