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bcachefs: Compression levels 

This allows including a compression level when specifying a compression
type, e.g.
  compression=zstd:15

Values from 1 through 15 indicate compression levels, 0 or unspecified
indicates the default.

For LZ4, values 3-15 specify that the HC algorithm should be used.

Note that for compatibility, extents themselves only include the
compression type, not the compression level. This means that specifying
the same compression algorithm but different compression levels for the
compression and background_compression options will have no effect.

XXX: perhaps we could add a warning for this

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-07-12 22:27:16 -04:00
parent e86e9124ca
commit 986e9842fb
10 changed files with 173 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/bcachefs/Kconfig
View File

@ -9,6 +9,8 @@ config BCACHEFS_FS
select FS_POSIX_ACL
select LZ4_COMPRESS
select LZ4_DECOMPRESS
select LZ4HC_COMPRESS
select LZ4HC_DECOMPRESS
select ZLIB_DEFLATE
select ZLIB_INFLATE
select ZSTD_COMPRESS

6
fs/bcachefs/checksum.h
View File

@ -120,12 +120,6 @@ static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
}
static const unsigned bch2_compression_opt_to_type[] = {
#define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_TYPE_##t,
BCH_COMPRESSION_OPTS()
#undef x
};
static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
unsigned type)
{

155
fs/bcachefs/compress.c
View File

@ -296,21 +296,32 @@ static int attempt_compress(struct bch_fs *c,
void *workspace,
void *dst, size_t dst_len,
void *src, size_t src_len,
enum bch_compression_type compression_type)
struct bch_compression_opt compression)
{
enum bch_compression_type compression_type =
__bch2_compression_opt_to_type[compression.type];
switch (compression_type) {
case BCH_COMPRESSION_TYPE_lz4: {
int len = src_len;
int ret = LZ4_compress_destSize(
src, dst,
&len, dst_len,
workspace);
case BCH_COMPRESSION_TYPE_lz4:
if (compression.level < LZ4HC_MIN_CLEVEL) {
int len = src_len;
int ret = LZ4_compress_destSize(
src, dst,
&len, dst_len,
workspace);
if (len < src_len)
return -len;
if (len < src_len)
return -len;
return ret;
} else {
int ret = LZ4_compress_HC(
src, dst,
src_len, dst_len,
compression.level,
workspace);
return ret;
}
return ret ?: -1;
}
case BCH_COMPRESSION_TYPE_gzip: {
z_stream strm = {
.next_in = src,
@ -320,7 +331,11 @@ static int attempt_compress(struct bch_fs *c,
};
zlib_set_workspace(&strm, workspace);
zlib_deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
zlib_deflateInit2(&strm,
compression.level
? clamp_t(unsigned, compression.level,
Z_BEST_SPEED, Z_BEST_COMPRESSION)
: Z_DEFAULT_COMPRESSION,
Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL,
Z_DEFAULT_STRATEGY);
@ -333,8 +348,14 @@ static int attempt_compress(struct bch_fs *c,
return strm.total_out;
}
case BCH_COMPRESSION_TYPE_zstd: {
/*
* rescale:
* zstd max compression level is 22, our max level is 15
*/
unsigned level = min((compression.level * 3) / 2, zstd_max_clevel());
ZSTD_parameters params = zstd_get_params(level, c->opts.encoded_extent_max);
ZSTD_CCtx *ctx = zstd_init_cctx(workspace,
zstd_cctx_workspace_bound(&c->zstd_params.cParams));
zstd_cctx_workspace_bound(&params.cParams));
/*
* ZSTD requires that when we decompress we pass in the exact
@ -365,10 +386,12 @@ static int attempt_compress(struct bch_fs *c,
static unsigned __bio_compress(struct bch_fs *c,
struct bio *dst, size_t *dst_len,
struct bio *src, size_t *src_len,
enum bch_compression_type compression_type)
struct bch_compression_opt compression)
{
struct bbuf src_data = { NULL }, dst_data = { NULL };
void *workspace;
enum bch_compression_type compression_type =
__bch2_compression_opt_to_type[compression.type];
unsigned pad;
int ret = 0;
@ -400,7 +423,7 @@ static unsigned __bio_compress(struct bch_fs *c,
ret = attempt_compress(c, workspace,
dst_data.b, *dst_len,
src_data.b, *src_len,
compression_type);
compression);
if (ret > 0) {
*dst_len = ret;
ret = 0;
@ -447,22 +470,24 @@ static unsigned __bio_compress(struct bch_fs *c,
BUG_ON(!*src_len || *src_len > src->bi_iter.bi_size);
BUG_ON(*dst_len & (block_bytes(c) - 1));
BUG_ON(*src_len & (block_bytes(c) - 1));
ret = compression_type;
out:
bio_unmap_or_unbounce(c, src_data);
bio_unmap_or_unbounce(c, dst_data);
return compression_type;
return ret;
err:
compression_type = BCH_COMPRESSION_TYPE_incompressible;
ret = BCH_COMPRESSION_TYPE_incompressible;
goto out;
}
unsigned bch2_bio_compress(struct bch_fs *c,
struct bio *dst, size_t *dst_len,
struct bio *src, size_t *src_len,
unsigned compression_type)
unsigned compression_opt)
{
unsigned orig_dst = dst->bi_iter.bi_size;
unsigned orig_src = src->bi_iter.bi_size;
unsigned compression_type;
/* Don't consume more than BCH_ENCODED_EXTENT_MAX from @src: */
src->bi_iter.bi_size = min_t(unsigned, src->bi_iter.bi_size,
@ -470,11 +495,9 @@ unsigned bch2_bio_compress(struct bch_fs *c,
/* Don't generate a bigger output than input: */
dst->bi_iter.bi_size = min(dst->bi_iter.bi_size, src->bi_iter.bi_size);
if (compression_type == BCH_COMPRESSION_TYPE_lz4_old)
compression_type = BCH_COMPRESSION_TYPE_lz4;
compression_type =
__bio_compress(c, dst, dst_len, src, src_len, compression_type);
__bio_compress(c, dst, dst_len, src, src_len,
bch2_compression_decode(compression_opt));
dst->bi_iter.bi_size = orig_dst;
src->bi_iter.bi_size = orig_src;
@ -521,8 +544,10 @@ static int __bch2_check_set_has_compressed_data(struct bch_fs *c, u64 f)
}
int bch2_check_set_has_compressed_data(struct bch_fs *c,
unsigned compression_type)
unsigned compression_opt)
{
unsigned compression_type = bch2_compression_decode(compression_opt).type;
BUG_ON(compression_type >= ARRAY_SIZE(bch2_compression_opt_to_feature));
return compression_type
@ -546,14 +571,16 @@ static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
{
size_t decompress_workspace_size = 0;
bool decompress_workspace_needed;
ZSTD_parameters params = zstd_get_params(0, c->opts.encoded_extent_max);
ZSTD_parameters params = zstd_get_params(zstd_max_clevel(),
c->opts.encoded_extent_max);
struct {
unsigned feature;
unsigned type;
size_t compress_workspace;
size_t decompress_workspace;
unsigned feature;
enum bch_compression_type type;
size_t compress_workspace;
size_t decompress_workspace;
} compression_types[] = {
{ BCH_FEATURE_lz4, BCH_COMPRESSION_TYPE_lz4, LZ4_MEM_COMPRESS, 0 },
{ BCH_FEATURE_lz4, BCH_COMPRESSION_TYPE_lz4,
max_t(size_t, LZ4_MEM_COMPRESS, LZ4HC_MEM_COMPRESS) },
{ BCH_FEATURE_gzip, BCH_COMPRESSION_TYPE_gzip,
zlib_deflate_workspacesize(MAX_WBITS, DEF_MEM_LEVEL),
zlib_inflate_workspacesize(), },
@ -612,16 +639,74 @@ static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
return 0;
}
static u64 compression_opt_to_feature(unsigned v)
{
unsigned type = bch2_compression_decode(v).type;
return 1ULL << bch2_compression_opt_to_feature[type];
}
int bch2_fs_compress_init(struct bch_fs *c)
{
u64 f = c->sb.features;
if (c->opts.compression)
f |= 1ULL << bch2_compression_opt_to_feature[c->opts.compression];
if (c->opts.background_compression)
f |= 1ULL << bch2_compression_opt_to_feature[c->opts.background_compression];
f |= compression_opt_to_feature(c->opts.compression);
f |= compression_opt_to_feature(c->opts.background_compression);
return __bch2_fs_compress_init(c, f);
}
int bch2_opt_compression_parse(struct bch_fs *c, const char *_val, u64 *res,
struct printbuf *err)
{
char *val = kstrdup(_val, GFP_KERNEL);
char *p = val, *type_str, *level_str;
struct bch_compression_opt opt = { 0 };
int ret;
if (!val)
return -ENOMEM;
type_str = strsep(&p, ":");
level_str = p;
ret = match_string(bch2_compression_opts, -1, type_str);
if (ret < 0 && err)
prt_str(err, "invalid compression type");
if (ret < 0)
goto err;
opt.type = ret;
if (level_str) {
unsigned level;
ret = kstrtouint(level_str, 10, &level);
if (!ret && !opt.type && level)
ret = -EINVAL;
if (!ret && level > 15)
ret = -EINVAL;
if (ret < 0 && err)
prt_str(err, "invalid compression level");
if (ret < 0)
goto err;
opt.level = level;
}
*res = bch2_compression_encode(opt);
err:
kfree(val);
return ret;
}
void bch2_opt_compression_to_text(struct printbuf *out,
struct bch_fs *c,
struct bch_sb *sb,
u64 v)
{
struct bch_compression_opt opt = bch2_compression_decode(v);
prt_str(out, bch2_compression_opts[opt.type]);
if (opt.level)
prt_printf(out, ":%u", opt.level);
}

37
fs/bcachefs/compress.h
View File

@ -4,6 +4,35 @@
#include "extents_types.h"
struct bch_compression_opt {
u8 type:4,
level:4;
};
static inline struct bch_compression_opt bch2_compression_decode(unsigned v)
{
return (struct bch_compression_opt) {
.type = v & 15,
.level = v >> 4,
};
}
static inline unsigned bch2_compression_encode(struct bch_compression_opt opt)
{
return opt.type|(opt.level << 4);
}
static const unsigned __bch2_compression_opt_to_type[] = {
#define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_TYPE_##t,
BCH_COMPRESSION_OPTS()
#undef x
};
static inline enum bch_compression_type bch2_compression_opt_to_type(unsigned v)
{
return __bch2_compression_opt_to_type[bch2_compression_decode(v).type];
}
int bch2_bio_uncompress_inplace(struct bch_fs *, struct bio *,
struct bch_extent_crc_unpacked *);
int bch2_bio_uncompress(struct bch_fs *, struct bio *, struct bio *,
@ -15,4 +44,12 @@ int bch2_check_set_has_compressed_data(struct bch_fs *, unsigned);
void bch2_fs_compress_exit(struct bch_fs *);
int bch2_fs_compress_init(struct bch_fs *);
int bch2_opt_compression_parse(struct bch_fs *, const char *, u64 *, struct printbuf *);
void bch2_opt_compression_to_text(struct printbuf *, struct bch_fs *, struct bch_sb *, u64);
#define bch2_opt_compression (struct bch_opt_fn) { \
.parse = bch2_opt_compression_parse, \
.to_text = bch2_opt_compression_to_text, \
}
#endif /* _BCACHEFS_COMPRESS_H */

4
fs/bcachefs/data_update.c
View File

@ -455,9 +455,7 @@ int bch2_data_update_init(struct btree_trans *trans,
BCH_WRITE_DATA_ENCODED|
BCH_WRITE_MOVE|
m->data_opts.write_flags;
m->op.compression_type =
bch2_compression_opt_to_type[io_opts.background_compression ?:
io_opts.compression];
m->op.compression_opt = io_opts.background_compression ?: io_opts.compression;
m->op.watermark = m->data_opts.btree_insert_flags & BCH_WATERMARK_MASK;
bkey_for_each_ptr(ptrs, ptr)

14
fs/bcachefs/io.c
View File

@ -1078,7 +1078,7 @@ static enum prep_encoded_ret {
/* Can we just write the entire extent as is? */
if (op->crc.uncompressed_size == op->crc.live_size &&
op->crc.compressed_size <= wp->sectors_free &&
(op->crc.compression_type == op->compression_type ||
(op->crc.compression_type == bch2_compression_opt_to_type(op->compression_opt) ||
op->incompressible)) {
if (!crc_is_compressed(op->crc) &&
op->csum_type != op->crc.csum_type &&
@ -1126,7 +1126,7 @@ static enum prep_encoded_ret {
/*
* If we want to compress the data, it has to be decrypted:
*/
if ((op->compression_type ||
if ((op->compression_opt ||
bch2_csum_type_is_encryption(op->crc.csum_type) !=
bch2_csum_type_is_encryption(op->csum_type)) &&
bch2_write_decrypt(op))
@ -1173,7 +1173,7 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
}
if (ec_buf ||
op->compression_type ||
op->compression_opt ||
(op->csum_type &&
!(op->flags & BCH_WRITE_PAGES_STABLE)) ||
(bch2_csum_type_is_encryption(op->csum_type) &&
@ -1196,16 +1196,16 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
dst->bi_iter.bi_size < c->opts.encoded_extent_max)
break;
BUG_ON(op->compression_type &&
BUG_ON(op->compression_opt &&
(op->flags & BCH_WRITE_DATA_ENCODED) &&
bch2_csum_type_is_encryption(op->crc.csum_type));
BUG_ON(op->compression_type && !bounce);
BUG_ON(op->compression_opt && !bounce);
crc.compression_type = op->incompressible
? BCH_COMPRESSION_TYPE_incompressible
: op->compression_type
: op->compression_opt
? bch2_bio_compress(c, dst, &dst_len, src, &src_len,
op->compression_type)
op->compression_opt)
: 0;
if (!crc_is_compressed(crc)) {
dst_len = min(dst->bi_iter.bi_size, src->bi_iter.bi_size);

2
fs/bcachefs/io.h
View File

@ -86,7 +86,7 @@ static inline void bch2_write_op_init(struct bch_write_op *op, struct bch_fs *c,
op->written = 0;
op->error = 0;
op->csum_type = bch2_data_checksum_type(c, opts);
op->compression_type = bch2_compression_opt_to_type[opts.compression];
op->compression_opt = opts.compression;
op->nr_replicas = 0;
op->nr_replicas_required = c->opts.data_replicas_required;
op->watermark = BCH_WATERMARK_normal;

2
fs/bcachefs/io_types.h
View File

@ -115,8 +115,8 @@ struct bch_write_op {
u16 flags;
s16 error; /* dio write path expects it to hold -ERESTARTSYS... */
unsigned compression_opt:8;
unsigned csum_type:4;
unsigned compression_type:4;
unsigned nr_replicas:4;
unsigned nr_replicas_required:4;
unsigned watermark:3;

4
fs/bcachefs/opts.h
View File

@ -174,12 +174,12 @@ enum fsck_err_opts {
NULL, NULL) \
x(compression, u8, \
OPT_FS|OPT_INODE|OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME, \
OPT_STR(bch2_compression_opts), \
OPT_FN(bch2_opt_compression), \
BCH_SB_COMPRESSION_TYPE, BCH_COMPRESSION_OPT_none, \
NULL, NULL) \
x(background_compression, u8, \
OPT_FS|OPT_INODE|OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME, \
OPT_STR(bch2_compression_opts), \
OPT_FN(bch2_opt_compression), \
BCH_SB_BACKGROUND_COMPRESSION_TYPE,BCH_COMPRESSION_OPT_none, \
NULL, NULL) \
x(str_hash, u8, \

3
fs/bcachefs/rebalance.c
View File

@ -5,6 +5,7 @@
#include "btree_iter.h"
#include "buckets.h"
#include "clock.h"
#include "compress.h"
#include "disk_groups.h"
#include "errcode.h"
#include "extents.h"
@ -45,7 +46,7 @@ static bool rebalance_pred(struct bch_fs *c, void *arg,
bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
if (!p.ptr.cached &&
p.crc.compression_type !=
bch2_compression_opt_to_type[io_opts->background_compression])
bch2_compression_opt_to_type(io_opts->background_compression))
data_opts->rewrite_ptrs |= 1U << i;
i++;
}