diff options
| author | Gao Xiang <hsiangkao@redhat.com> | 2021-03-29 09:23:07 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@redhat.com> | 2021-03-29 10:24:58 +0800 |
| commit | 46249cded18ac0c4ffb7b177219510a133a51c00 (patch) | |
| tree | 71682f8e22563f0c126c81d6848b276f3284f239 /fs/erofs/decompressor.c | |
| parent | 5d50538fc567c6f3692dec1825fb38c5a0884d93 (diff) | |
erofs: introduce on-disk lz4 fs configurations
Introduce z_erofs_lz4_cfgs to store all lz4 configurations.
Currently it's only max_distance, but will be used for new
features later.
Link: https://lore.kernel.org/r/20210329012308.28743-4-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 | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c index 93411e9df9b6..97538ff24a19 100644 --- a/fs/erofs/decompressor.c +++ b/fs/erofs/decompressor.c @@ -29,9 +29,20 @@ struct z_erofs_decompressor { }; int z_erofs_load_lz4_config(struct super_block *sb, - struct erofs_super_block *dsb) + struct erofs_super_block *dsb, + struct z_erofs_lz4_cfgs *lz4, int size) { - u16 distance = le16_to_cpu(dsb->lz4_max_distance); + u16 distance; + + if (lz4) { + if (size < sizeof(struct z_erofs_lz4_cfgs)) { + erofs_err(sb, "invalid lz4 cfgs, size=%u", size); + return -EINVAL; + } + distance = le16_to_cpu(lz4->max_distance); + } else { + distance = le16_to_cpu(dsb->lz4_max_distance); + } EROFS_SB(sb)->lz4.max_distance_pages = distance ? DIV_ROUND_UP(distance, PAGE_SIZE) + 1 : |