diff options
Diffstat (limited to 'fs/erofs/decompressor.c')
| -rw-r--r-- | fs/erofs/decompressor.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c index 80e8871aef71..93411e9df9b6 100644 --- a/fs/erofs/decompressor.c +++ b/fs/erofs/decompressor.c @@ -28,6 +28,17 @@ struct z_erofs_decompressor { char *name; }; +int z_erofs_load_lz4_config(struct super_block *sb, + struct erofs_super_block *dsb) +{ + u16 distance = le16_to_cpu(dsb->lz4_max_distance); + + EROFS_SB(sb)->lz4.max_distance_pages = distance ? + DIV_ROUND_UP(distance, PAGE_SIZE) + 1 : + LZ4_MAX_DISTANCE_PAGES; + return 0; +} + static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq, struct list_head *pagepool) { @@ -36,6 +47,8 @@ static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq, struct page *availables[LZ4_MAX_DISTANCE_PAGES] = { NULL }; unsigned long bounced[DIV_ROUND_UP(LZ4_MAX_DISTANCE_PAGES, BITS_PER_LONG)] = { 0 }; + unsigned int lz4_max_distance_pages = + EROFS_SB(rq->sb)->lz4.max_distance_pages; void *kaddr = NULL; unsigned int i, j, top; @@ -44,14 +57,14 @@ static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq, struct page *const page = rq->out[i]; struct page *victim; - if (j >= LZ4_MAX_DISTANCE_PAGES) + if (j >= lz4_max_distance_pages) j = 0; /* 'valid' bounced can only be tested after a complete round */ if (test_bit(j, bounced)) { - DBG_BUGON(i < LZ4_MAX_DISTANCE_PAGES); - DBG_BUGON(top >= LZ4_MAX_DISTANCE_PAGES); - availables[top++] = rq->out[i - LZ4_MAX_DISTANCE_PAGES]; + DBG_BUGON(i < lz4_max_distance_pages); + DBG_BUGON(top >= lz4_max_distance_pages); + availables[top++] = rq->out[i - lz4_max_distance_pages]; } if (page) { |