linux-stable.git/include/linux/f2fs_fs.h, branch v6.3.8

f2fs: clarify compress level bit offset

2023-01-31T18:47:45+00:00

commit 3fde13f817e2 ("f2fs: compress: support compress level") introduce
compress level, which macro(COMPRESS_LEVEL_OFFSET) is 8, But use wrong
comment about compress level.

Let's fix it.

Signed-off-by: Yangtao Li 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: support recording errors into superblock

2022-10-04T20:31:45+00:00

This patch supports to record detail reason of FSCORRUPTED error into
f2fs_super_block.s_errors[].

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: support recording stop_checkpoint reason into super_block

2022-10-04T20:31:44+00:00

This patch supports to record stop_checkpoint error into
f2fs_super_block.s_stop_reason[].

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: compress: add compress_inode to cache compressed blocks

2021-06-23T08:09:35+00:00

Support to use address space of inner inode to cache compressed block,
in order to improve cache hit ratio of random read.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: introduce FI_COMPRESS_RELEASED instead of using IMMUTABLE bit

2021-06-23T08:09:34+00:00

Once we release compressed blocks, we used to set IMMUTABLE bit. But it turned
out it disallows every fs operations which we don't need for compression.

Let's just prevent writing data only.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: Replace one-element array with flexible-array member

2021-03-12T21:16:42+00:00

There is a regular need in the kernel to provide a way to declare having
a dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].

Refactor the code according to the use of a flexible-array member in
struct f2fs_checkpoint, instead of a one-element arrays.

Notice that a temporary pointer to void '*tmp_ptr' was used in order to
fix the following errors when using a flexible array instead of a one
element array in struct f2fs_checkpoint:

  CC [M]  fs/f2fs/dir.o
In file included from fs/f2fs/dir.c:13:
fs/f2fs/f2fs.h: In function ‘__bitmap_ptr’:
fs/f2fs/f2fs.h:2227:40: error: invalid use of flexible array member
 2227 |   return &ckpt->sit_nat_version_bitmap + offset + sizeof(__le32);
      |                                        ^
fs/f2fs/f2fs.h:2227:49: error: invalid use of flexible array member
 2227 |   return &ckpt->sit_nat_version_bitmap + offset + sizeof(__le32);
      |                                                 ^
fs/f2fs/f2fs.h:2238:40: error: invalid use of flexible array member
 2238 |   return &ckpt->sit_nat_version_bitmap + offset;
      |                                        ^
make[2]: *** [scripts/Makefile.build:287: fs/f2fs/dir.o] Error 1
make[1]: *** [scripts/Makefile.build:530: fs/f2fs] Error 2
make: *** [Makefile:1819: fs] Error 2

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.9/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/79
Build-tested-by: kernel test robot 
Link: https://lore.kernel.org/lkml/603647e4.DeEFbl4eqljuwAUe%25lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: compress: support compress level

2021-01-27T23:20:02+00:00

Expand 'compress_algorithm' mount option to accept parameter as format of
:, by this way, it gives a way to allow user to do more
specified config on lz4 and zstd compression level, then f2fs compression
can provide higher compress ratio.

In order to set compress level for lz4 algorithm, it needs to set
CONFIG_LZ4HC_COMPRESS and CONFIG_F2FS_FS_LZ4HC config to enable lz4hc
compress algorithm.

CR and performance number on lz4/lz4hc algorithm:

dd if=enwik9 of=compressed_file conv=fsync

Original blocks:	244382

			lz4			lz4hc-9
compressed blocks	170647			163270
compress ratio		69.8%			66.8%
speed			16.4207 s, 60.9 MB/s	26.7299 s, 37.4 MB/s

compress ratio = after / before

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: compress: support chksum

2020-12-03T06:00:22+00:00

This patch supports to store chksum value with compressed
data, and verify the integrality of compressed data while
reading the data.

The feature can be enabled through specifying mount option
'compress_chksum'.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: Use generic casefolding support

2020-09-10T21:03:31+00:00

This switches f2fs over to the generic support provided in
the previous patch.

Since casefolded dentries behave the same in ext4 and f2fs, we decrease
the maintenance burden by unifying them, and any optimizations will
immediately apply to both.

Signed-off-by: Daniel Rosenberg 
Reviewed-by: Eric Biggers 
Signed-off-by: Jaegeuk Kim

f2fs: Add a new CP flag to help fsck fix resize SPO issues

2020-03-23T04:16:28+00:00

Add and set a new CP flag CP_RESIZEFS_FLAG during
online resize FS to help fsck fix the metadata mismatch
that may happen due to SPO during resize, where SB
got updated but CP data couldn't be written yet.

fsck errors -
Info: CKPT version = 6ed7bccb
        Wrong user_block_count(2233856)
[f2fs_do_mount:3365] Checkpoint is polluted

Signed-off-by: Sahitya Tummala 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim