Merge tag 'f2fs-for-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs updates from Jaegeuk Kim:
 "In this round, we've improved the compression support especially for
  Android such as allowing compression for mmap files, replacing the
  immutable bit with internal bit to prohibits data writes explicitly,
  and adding a mount option, "compress_cache", to improve random reads.
  And, we added "readonly" feature to compact the partition w/
  compression enabled, which will be useful for Android RO partitions.

  Enhancements:
   - support compression for mmap file
   - use an f2fs flag instead of IMMUTABLE bit for compression
   - support RO feature w/ extent_cache
   - fully support swapfile with file pinning
   - improve atgc tunability
   - add nocompress extensions to unselect files for compression

  Bug fixes:
   - fix false alaram on iget failure during GC
   - fix race condition on global pointers when there are multiple f2fs
     instances
   - add MODULE_SOFTDEP for initramfs

  As usual, we've also cleaned up some places for better code
  readability (e.g., sysfs/feature, debugging messages, slab cache
  name, and docs)"

* tag 'f2fs-for-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (32 commits)
  f2fs: drop dirty node pages when cp is in error status
  f2fs: initialize page->private when using for our internal use
  f2fs: compress: add nocompress extensions support
  MAINTAINERS: f2fs: update my email address
  f2fs: remove false alarm on iget failure during GC
  f2fs: enable extent cache for compression files in read-only
  f2fs: fix to avoid adding tab before doc section
  f2fs: introduce f2fs_casefolded_name slab cache
  f2fs: swap: support migrating swapfile in aligned write mode
  f2fs: swap: remove dead codes
  f2fs: compress: add compress_inode to cache compressed blocks
  f2fs: clean up /sys/fs/f2fs/<disk>/features
  f2fs: add pin_file in feature list
  f2fs: Advertise encrypted casefolding in sysfs
  f2fs: Show casefolding support only when supported
  f2fs: support RO feature
  f2fs: logging neatening
  f2fs: introduce FI_COMPRESS_RELEASED instead of using IMMUTABLE bit
  f2fs: compress: remove unneeded preallocation
  f2fs: atgc: export entries for better tunability via sysfs
  ...

2 files changed, 97 insertions, 10 deletions

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 5d9ae27bd462..ef4b9218ae1e 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -203,7 +203,34 @@ Description:	Shows total written kbytes issued to disk.
 What:		/sys/fs/f2fs/<disk>/features
 Date:		July 2017
 Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
-Description:	Shows all enabled features in current device.
+Description:	<deprecated: should use /sys/fs/f2fs/<disk>/feature_list/
+		Shows all enabled features in current device.
+		Supported features:
+		encryption, blkzoned, extra_attr, projquota, inode_checksum,
+		flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
+		verity, sb_checksum, casefold, readonly, compression, pin_file.
+
+What:		/sys/fs/f2fs/<disk>/feature_list/
+Date:		June 2021
+Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:	Expand /sys/fs/f2fs/<disk>/features to meet sysfs rule.
+		Supported on-disk features:
+		encryption, block_zoned (aka blkzoned), extra_attr,
+		project_quota (aka projquota), inode_checksum,
+		flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
+		verity, sb_checksum, casefold, readonly, compression.
+		Note that, pin_file is moved into /sys/fs/f2fs/features/.
+
+What:		/sys/fs/f2fs/features/
+Date:		July 2017
+Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:	Shows all enabled kernel features.
+		Supported features:
+		encryption, block_zoned, extra_attr, project_quota,
+		inode_checksum, flexible_inline_xattr, quota_ino,
+		inode_crtime, lost_found, verity, sb_checksum,
+		casefold, readonly, compression, test_dummy_encryption_v2,
+		atomic_write, pin_file, encrypted_casefold.
 
 What:		/sys/fs/f2fs/<disk>/inject_rate
 Date:		May 2016
@@ -438,3 +465,31 @@ Description:	Show the count of inode newly enabled for compression since mount.
 		Note that when the compression is disabled for the files, this count
 		doesn't decrease. If you write "0" here, you can initialize
 		compr_new_inode to "0".
+
+What:		/sys/fs/f2fs/<disk>/atgc_candidate_ratio
+Date:		May 2021
+Contact:	"Chao Yu" <yuchao0@huawei.com>
+Description:	When ATGC is on, it controls candidate ratio in order to limit total
+		number of potential victim in all candidates, the value should be in
+		range of [0, 100], by default it was initialized as 20(%).
+
+What:		/sys/fs/f2fs/<disk>/atgc_candidate_count
+Date:		May 2021
+Contact:	"Chao Yu" <yuchao0@huawei.com>
+Description:	When ATGC is on, it controls candidate count in order to limit total
+		number of potential victim in all candidates, by default it was
+		initialized as 10 (sections).
+
+What:		/sys/fs/f2fs/<disk>/atgc_age_weight
+Date:		May 2021
+Contact:	"Chao Yu" <yuchao0@huawei.com>
+Description:	When ATGC is on, it controls age weight to balance weight proportion
+		in between aging and valid blocks, the value should be in range of
+		[0, 100], by default it was initialized as 60(%).
+
+What:		/sys/fs/f2fs/<disk>/atgc_age_threshold
+Date:		May 2021
+Contact:	"Chao Yu" <yuchao0@huawei.com>
+Description:	When ATGC is on, it controls age threshold to bypass GCing young
+		candidates whose age is not beyond the threshold, by default it was
+		initialized as 604800 seconds (equals to 7 days).
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index 992bf91eeec8..ff9e7cc97c65 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -281,6 +281,18 @@ compress_extension=%s	 Support adding specified extension, so that f2fs can enab
 			 For other files, we can still enable compression via ioctl.
 			 Note that, there is one reserved special extension '*', it
 			 can be set to enable compression for all files.
+nocompress_extension=%s	   Support adding specified extension, so that f2fs can disable
+			 compression on those corresponding files, just contrary to compression extension.
+			 If you know exactly which files cannot be compressed, you can use this.
+			 The same extension name can't appear in both compress and nocompress
+			 extension at the same time.
+			 If the compress extension specifies all files, the types specified by the
+			 nocompress extension will be treated as special cases and will not be compressed.
+			 Don't allow use '*' to specifie all file in nocompress extension.
+			 After add nocompress_extension, the priority should be:
+			 dir_flag < comp_extention,nocompress_extension < comp_file_flag,no_comp_file_flag.
+			 See more in compression sections.
+
 compress_chksum		 Support verifying chksum of raw data in compressed cluster.
 compress_mode=%s	 Control file compression mode. This supports "fs" and "user"
 			 modes. In "fs" mode (default), f2fs does automatic compression
@@ -289,6 +301,9 @@ compress_mode=%s	 Control file compression mode. This supports "fs" and "user"
 			 choosing the target file and the timing. The user can do manual
 			 compression/decompression on the compression enabled files using
 			 ioctls.
+compress_cache		 Support to use address space of a filesystem managed inode to
+			 cache compressed block, in order to improve cache hit ratio of
+			 random read.
 inlinecrypt		 When possible, encrypt/decrypt the contents of encrypted
 			 files using the blk-crypto framework rather than
 			 filesystem-layer encryption. This allows the use of
@@ -717,10 +732,10 @@ users.
 ===================== ======================== ===================
 User                  F2FS                     Block
 ===================== ======================== ===================
-                      META                     WRITE_LIFE_NOT_SET
-                      HOT_NODE                 "
-                      WARM_NODE                "
-                      COLD_NODE                "
+N/A                   META                     WRITE_LIFE_NOT_SET
+N/A                   HOT_NODE                 "
+N/A                   WARM_NODE                "
+N/A                   COLD_NODE                "
 ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
 extension list        "                        "
 
@@ -746,10 +761,10 @@ WRITE_LIFE_LONG       "                        WRITE_LIFE_LONG
 ===================== ======================== ===================
 User                  F2FS                     Block
 ===================== ======================== ===================
-                      META                     WRITE_LIFE_MEDIUM;
-                      HOT_NODE                 WRITE_LIFE_NOT_SET
-                      WARM_NODE                "
-                      COLD_NODE                WRITE_LIFE_NONE
+N/A                   META                     WRITE_LIFE_MEDIUM;
+N/A                   HOT_NODE                 WRITE_LIFE_NOT_SET
+N/A                   WARM_NODE                "
+N/A                   COLD_NODE                WRITE_LIFE_NONE
 ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
 extension list        "                        "
 
@@ -814,13 +829,30 @@ Compression implementation
   all logical blocks in cluster contain valid data and compress ratio of
   cluster data is lower than specified threshold.
 
-- To enable compression on regular inode, there are three ways:
+- To enable compression on regular inode, there are four ways:
 
   * chattr +c file
   * chattr +c dir; touch dir/file
   * mount w/ -o compress_extension=ext; touch file.ext
   * mount w/ -o compress_extension=*; touch any_file
 
+- To disable compression on regular inode, there are two ways:
+
+  * chattr -c file
+  * mount w/ -o nocompress_extension=ext; touch file.ext
+
+- Priority in between FS_COMPR_FL, FS_NOCOMP_FS, extensions:
+
+  * compress_extension=so; nocompress_extension=zip; chattr +c dir; touch
+    dir/foo.so; touch dir/bar.zip; touch dir/baz.txt; then foo.so and baz.txt
+    should be compresse, bar.zip should be non-compressed. chattr +c dir/bar.zip
+    can enable compress on bar.zip.
+  * compress_extension=so; nocompress_extension=zip; chattr -c dir; touch
+    dir/foo.so; touch dir/bar.zip; touch dir/baz.txt; then foo.so should be
+    compresse, bar.zip and baz.txt should be non-compressed.
+    chattr+c dir/bar.zip; chattr+c dir/baz.txt; can enable compress on bar.zip
+    and baz.txt.
+
 - At this point, compression feature doesn't expose compressed space to user
   directly in order to guarantee potential data updates later to the space.
   Instead, the main goal is to reduce data writes to flash disk as much as