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| author | Gao Xiang <hsiangkao@redhat.com> | 2021-03-29 18:00:12 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@redhat.com> | 2021-03-29 18:01:42 +0800 |
| commit | 14373711dd54be8a84e2f4f624bc58787f80cfbd (patch) | |
| tree | 46b55e6a840c01886d88145052f5b2460dfbf0e8 /fs/erofs/decompressor.c | |
| parent | 46249cded18ac0c4ffb7b177219510a133a51c00 (diff) | |
| download | linux-14373711dd54be8a84e2f4f624bc58787f80cfbd.tar.gz linux-14373711dd54be8a84e2f4f624bc58787f80cfbd.tar.bz2 linux-14373711dd54be8a84e2f4f624bc58787f80cfbd.zip | |
erofs: add on-disk compression configurations
Add a bitmap for available compression algorithms and a variable-sized
on-disk table for compression options in preparation for upcoming big
pcluster and LZMA algorithm, which follows the end of super block.
To parse the compression options, the bitmap is scanned one by one.
For each available algorithm, there is data followed by 2-byte `length'
correspondingly (it's enough for most cases, or entire fs blocks should
be used.)
With such available algorithm bitmap, kernel itself can also refuse to
mount such filesystem if any unsupported compression algorithm exists.
Note that COMPR_CFGS feature will be enabled with BIG_PCLUSTER.
Link: https://lore.kernel.org/r/20210329100012.12980-1-hsiangkao@aol.com
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Diffstat (limited to 'fs/erofs/decompressor.c')
| -rw-r--r-- | fs/erofs/decompressor.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c index 97538ff24a19..27aa6a99b371 100644 --- a/fs/erofs/decompressor.c +++ b/fs/erofs/decompressor.c @@ -41,7 +41,7 @@ int z_erofs_load_lz4_config(struct super_block *sb, } distance = le16_to_cpu(lz4->max_distance); } else { - distance = le16_to_cpu(dsb->lz4_max_distance); + distance = le16_to_cpu(dsb->u1.lz4_max_distance); } EROFS_SB(sb)->lz4.max_distance_pages = distance ? |