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>
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 8bdd3dc..3e45252 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;
+}
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index d2781ff..da20755 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -76,7 +76,7 @@ struct compressed_bio {
void btrfs_init_compress(void);
void btrfs_exit_compress(void);
-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,
@@ -95,6 +95,8 @@ blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start,
blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
int mirror_num, unsigned long bio_flags);
+unsigned btrfs_compress_str2level(const char *str);
+
enum btrfs_compression_type {
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
@@ -124,6 +126,8 @@ struct btrfs_compress_op {
struct page *dest_page,
unsigned long start_byte,
size_t srclen, size_t destlen);
+
+ void (*set_level)(struct list_head *ws, unsigned int type);
};
extern const struct btrfs_compress_op btrfs_zlib_compress;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 7bda842..2c02d95 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -790,6 +790,7 @@ struct btrfs_fs_info {
*/
unsigned long pending_changes;
unsigned long compress_type:4;
+ unsigned int compress_level;
int commit_interval;
/*
* It is a suggestive number, the read side is safe even it gets a
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f2787ca..3f1b53f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -539,7 +539,10 @@ static noinline void compress_file_range(struct inode *inode,
*/
extent_range_clear_dirty_for_io(inode, start, end);
redirty = 1;
- ret = btrfs_compress_pages(compress_type,
+
+ /* Compression level is applied here and only here */
+ ret = btrfs_compress_pages(
+ compress_type | (fs_info->compress_level << 4),
inode->i_mapping, start,
pages,
&nr_pages,
diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index d433e75..6c7f18c 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -430,10 +430,15 @@ static int lzo_decompress(struct list_head *ws, unsigned char *data_in,
return ret;
}
+static void lzo_set_level(struct list_head *ws, unsigned int type)
+{
+}
+
const struct btrfs_compress_op btrfs_lzo_compress = {
.alloc_workspace = lzo_alloc_workspace,
.free_workspace = lzo_free_workspace,
.compress_pages = lzo_compress_pages,
.decompress_bio = lzo_decompress_bio,
.decompress = lzo_decompress,
+ .set_level = lzo_set_level,
};
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 4fb7eef..57f3f96 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -508,6 +508,8 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
strncmp(args[0].from, "zlib", 4) == 0) {
compress_type = "zlib";
info->compress_type = BTRFS_COMPRESS_ZLIB;
+ info->compress_level =
+ btrfs_compress_str2level(args[0].from);
btrfs_set_opt(info->mount_opt, COMPRESS);
btrfs_clear_opt(info->mount_opt, NODATACOW);
btrfs_clear_opt(info->mount_opt, NODATASUM);
@@ -555,9 +557,9 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
compress_force != saved_compress_force)) ||
(!btrfs_test_opt(info, COMPRESS) &&
no_compress == 1)) {
- btrfs_info(info, "%s %s compression",
+ btrfs_info(info, "%s %s compression, level %d",
(compress_force) ? "force" : "use",
- compress_type);
+ compress_type, info->compress_level);
}
compress_force = false;
break;
@@ -1258,6 +1260,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_printf(seq, ",compress-force=%s", compress_type);
else
seq_printf(seq, ",compress=%s", compress_type);
+ if (info->compress_level)
+ seq_printf(seq, "%d", info->compress_level);
}
if (btrfs_test_opt(info, NOSSD))
seq_puts(seq, ",nossd");
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index c248f92..2b52950 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -37,6 +37,7 @@ struct workspace {
z_stream strm;
char *buf;
struct list_head list;
+ int level;
};
static void zlib_free_workspace(struct list_head *ws)
@@ -96,7 +97,7 @@ static int zlib_compress_pages(struct list_head *ws,
*total_out = 0;
*total_in = 0;
- if (Z_OK != zlib_deflateInit(&workspace->strm, 3)) {
+ if (Z_OK != zlib_deflateInit(&workspace->strm, workspace->level)) {
pr_warn("BTRFS: deflateInit failed\n");
ret = -EIO;
goto out;
@@ -402,10 +403,22 @@ static int zlib_decompress(struct list_head *ws, unsigned char *data_in,
return ret;
}
+static void zlib_set_level(struct list_head *ws, unsigned int type)
+{
+ struct workspace *workspace = list_entry(ws, struct workspace, list);
+ unsigned level = (type & 0xF0) >> 4;
+
+ if (level > 9)
+ level = 9;
+
+ workspace->level = level > 0 ? level : 3;
+}
+
const struct btrfs_compress_op btrfs_zlib_compress = {
.alloc_workspace = zlib_alloc_workspace,
.free_workspace = zlib_free_workspace,
.compress_pages = zlib_compress_pages,
.decompress_bio = zlib_decompress_bio,
.decompress = zlib_decompress,
+ .set_level = zlib_set_level,
};
diff --git a/fs/btrfs/zstd.c b/fs/btrfs/zstd.c
index 607ce47..17f2dd8 100644
--- a/fs/btrfs/zstd.c
+++ b/fs/btrfs/zstd.c
@@ -423,10 +423,15 @@ static int zstd_decompress(struct list_head *ws, unsigned char *data_in,
return ret;
}
+static void zstd_set_level(struct list_head *ws, unsigned int type)
+{
+}
+
const struct btrfs_compress_op btrfs_zstd_compress = {
.alloc_workspace = zstd_alloc_workspace,
.free_workspace = zstd_free_workspace,
.compress_pages = zstd_compress_pages,
.decompress_bio = zstd_decompress_bio,
.decompress = zstd_decompress,
+ .set_level = zstd_set_level,
};