diff options
Diffstat (limited to 'fs/btrfs/compression.c')
| -rw-r--r-- | fs/btrfs/compression.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 8bdd3dc6c4dc..3e452525f8ad 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -884,6 +884,11 @@ static void free_workspaces(void) * Given an address space and start and length, compress the bytes into @pages * that are allocated on demand. * + * @type_level is encoded algorithm and level, where level 0 means whatever + * default the algorithm chooses and is opaque here; + * - compression algo are 0-3 + * - the level are bits 4-7 + * * @out_pages is an in/out parameter, holds maximum number of pages to allocate * and returns number of actually allocated pages * @@ -898,7 +903,7 @@ static void free_workspaces(void) * @max_out tells us the max number of bytes that we're allowed to * stuff into pages */ -int btrfs_compress_pages(int type, struct address_space *mapping, +int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping, u64 start, struct page **pages, unsigned long *out_pages, unsigned long *total_in, @@ -906,9 +911,11 @@ int btrfs_compress_pages(int type, struct address_space *mapping, { struct list_head *workspace; int ret; + int type = type_level & 0xF; workspace = find_workspace(type); + btrfs_compress_op[type - 1]->set_level(workspace, type_level); ret = btrfs_compress_op[type-1]->compress_pages(workspace, mapping, start, pages, out_pages, @@ -1098,3 +1105,14 @@ int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end) return ret; } + +unsigned int btrfs_compress_str2level(const char *str) +{ + if (strncmp(str, "zlib", 4) != 0) + return 0; + + if ('1' <= str[4] && str[4] <= '9' ) + return str[4] - '0'; + + return 0; +} |