diff options
author | David Sterba <dsterba@suse.com> | 2017-09-15 17:36:57 +0200 |
---|---|---|
committer | David Sterba <dsterba@suse.com> | 2017-11-01 20:45:29 +0100 |
commit | f51d2b59120ff364a5e612a594ed358767e1cd09 (patch) | |
tree | 349ed68bde053fc040138f4255aca2dab83b0bba /fs/btrfs/compression.c | |
parent | d4417e22551377c6e589c15ff2b931610e5230bc (diff) | |
download | linux-stable-f51d2b59120ff364a5e612a594ed358767e1cd09.tar.gz linux-stable-f51d2b59120ff364a5e612a594ed358767e1cd09.tar.bz2 linux-stable-f51d2b59120ff364a5e612a594ed358767e1cd09.zip |
btrfs: allow to set compression level for zlib
Preliminary support for setting compression level for zlib, the
following works:
$ mount -o compess=zlib # default
$ mount -o compess=zlib0 # same
$ mount -o compess=zlib9 # level 9, slower sync, less data
$ mount -o compess=zlib1 # level 1, faster sync, more data
$ mount -o remount,compress=zlib3 # level set by remount
The compress-force works the same as compress'. The level is visible in
the same format in /proc/mounts. Level set via file property does not
work yet.
Required patch: "btrfs: prepare for extensions in compression options"
Signed-off-by: David Sterba <dsterba@suse.com>
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; +} |