+// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "checksum.h"
#include "compress.h"
#include "extents.h"
-#include "io.h"
#include "super-io.h"
-#include "lz4.h"
#include <linux/lz4.h>
#include <linux/zlib.h>
#include <linux/zstd.h>
BB_NONE,
BB_VMAP,
BB_KMALLOC,
- BB_VMALLOC,
BB_MEMPOOL,
} type;
int rw;
{
void *b;
- BUG_ON(size > c->sb.encoded_extent_max << 9);
+ BUG_ON(size > c->opts.encoded_extent_max);
- b = kmalloc(size, GFP_NOIO|__GFP_NOWARN);
+ b = kmalloc(size, GFP_NOFS|__GFP_NOWARN);
if (b)
return (struct bbuf) { .b = b, .type = BB_KMALLOC, .rw = rw };
- b = mempool_alloc(&c->compression_bounce[rw], GFP_NOWAIT);
- b = b ? page_address(b) : NULL;
+ b = mempool_alloc(&c->compression_bounce[rw], GFP_NOFS);
if (b)
return (struct bbuf) { .b = b, .type = BB_MEMPOOL, .rw = rw };
- b = vmalloc(size);
- if (b)
- return (struct bbuf) { .b = b, .type = BB_VMALLOC, .rw = rw };
+ BUG();
+}
- b = mempool_alloc(&c->compression_bounce[rw], GFP_NOIO);
- b = b ? page_address(b) : NULL;
- if (b)
- return (struct bbuf) { .b = b, .type = BB_MEMPOOL, .rw = rw };
+static bool bio_phys_contig(struct bio *bio, struct bvec_iter start)
+{
+ struct bio_vec bv;
+ struct bvec_iter iter;
+ void *expected_start = NULL;
- BUG();
+ __bio_for_each_bvec(bv, bio, iter, start) {
+ if (expected_start &&
+ expected_start != page_address(bv.bv_page) + bv.bv_offset)
+ return false;
+
+ expected_start = page_address(bv.bv_page) +
+ bv.bv_offset + bv.bv_len;
+ }
+
+ return true;
}
static struct bbuf __bio_map_or_bounce(struct bch_fs *c, struct bio *bio,
unsigned nr_pages = 0;
struct page *stack_pages[16];
struct page **pages = NULL;
- bool first = true;
- unsigned prev_end = PAGE_SIZE;
void *data;
- BUG_ON(bvec_iter_sectors(start) > c->sb.encoded_extent_max);
+ BUG_ON(start.bi_size > c->opts.encoded_extent_max);
-#ifndef CONFIG_HIGHMEM
- __bio_for_each_contig_segment(bv, bio, iter, start) {
- if (bv.bv_len == start.bi_size)
- return (struct bbuf) {
- .b = page_address(bv.bv_page) + bv.bv_offset,
- .type = BB_NONE, .rw = rw
- };
- }
-#endif
+ if (!PageHighMem(bio_iter_page(bio, start)) &&
+ bio_phys_contig(bio, start))
+ return (struct bbuf) {
+ .b = page_address(bio_iter_page(bio, start)) +
+ bio_iter_offset(bio, start),
+ .type = BB_NONE, .rw = rw
+ };
+
+ /* check if we can map the pages contiguously: */
__bio_for_each_segment(bv, bio, iter, start) {
- if ((!first && bv.bv_offset) ||
- prev_end != PAGE_SIZE)
+ if (iter.bi_size != start.bi_size &&
+ bv.bv_offset)
+ goto bounce;
+
+ if (bv.bv_len < iter.bi_size &&
+ bv.bv_offset + bv.bv_len < PAGE_SIZE)
goto bounce;
- prev_end = bv.bv_offset + bv.bv_len;
nr_pages++;
}
BUG_ON(DIV_ROUND_UP(start.bi_size, PAGE_SIZE) > nr_pages);
pages = nr_pages > ARRAY_SIZE(stack_pages)
- ? kmalloc_array(nr_pages, sizeof(struct page *), GFP_NOIO)
+ ? kmalloc_array(nr_pages, sizeof(struct page *), GFP_NOFS)
: stack_pages;
if (!pages)
goto bounce;
case BB_KMALLOC:
kfree(buf.b);
break;
- case BB_VMALLOC:
- vfree(buf.b);
- break;
case BB_MEMPOOL:
- mempool_free(virt_to_page(buf.b),
- &c->compression_bounce[buf.rw]);
+ mempool_free(buf.b, &c->compression_bounce[buf.rw]);
break;
}
}
src_data = bio_map_or_bounce(c, src, READ);
switch (crc.compression_type) {
- case BCH_COMPRESSION_LZ4_OLD:
- ret = bch2_lz4_decompress(src_data.b, &src_len,
- dst_data, dst_len);
- if (ret)
- goto err;
- break;
- case BCH_COMPRESSION_LZ4:
+ case BCH_COMPRESSION_TYPE_lz4_old:
+ case BCH_COMPRESSION_TYPE_lz4:
ret = LZ4_decompress_safe_partial(src_data.b, dst_data,
src_len, dst_len, dst_len);
if (ret != dst_len)
goto err;
break;
- case BCH_COMPRESSION_GZIP: {
+ case BCH_COMPRESSION_TYPE_gzip: {
z_stream strm = {
.next_in = src_data.b,
.avail_in = src_len,
.avail_out = dst_len,
};
- workspace = mempool_alloc(&c->decompress_workspace, GFP_NOIO);
+ workspace = mempool_alloc(&c->decompress_workspace, GFP_NOFS);
zlib_set_workspace(&strm, workspace);
zlib_inflateInit2(&strm, -MAX_WBITS);
goto err;
break;
}
- case BCH_COMPRESSION_ZSTD: {
+ case BCH_COMPRESSION_TYPE_zstd: {
ZSTD_DCtx *ctx;
- size_t len;
+ size_t real_src_len = le32_to_cpup(src_data.b);
- workspace = mempool_alloc(&c->decompress_workspace, GFP_NOIO);
- ctx = ZSTD_initDCtx(workspace, ZSTD_DCtxWorkspaceBound());
+ if (real_src_len > src_len - 4)
+ goto err;
- src_len = le32_to_cpup(src_data.b);
+ workspace = mempool_alloc(&c->decompress_workspace, GFP_NOFS);
+ ctx = zstd_init_dctx(workspace, zstd_dctx_workspace_bound());
- len = ZSTD_decompressDCtx(ctx,
+ ret = zstd_decompress_dctx(ctx,
dst_data, dst_len,
- src_data.b + 4, src_len);
+ src_data.b + 4, real_src_len);
mempool_free(workspace, &c->decompress_workspace);
- if (len != dst_len)
+ if (ret != dst_len)
goto err;
break;
}
BUG_ON(!bio->bi_vcnt);
BUG_ON(DIV_ROUND_UP(crc->live_size, PAGE_SECTORS) > bio->bi_max_vecs);
- if (crc->uncompressed_size > c->sb.encoded_extent_max ||
- crc->compressed_size > c->sb.encoded_extent_max) {
+ if (crc->uncompressed_size << 9 > c->opts.encoded_extent_max ||
+ crc->compressed_size << 9 > c->opts.encoded_extent_max) {
bch_err(c, "error rewriting existing data: extent too big");
return -EIO;
}
data = __bounce_alloc(c, dst_len, WRITE);
if (__bio_uncompress(c, bio, data.b, *crc)) {
- bch_err(c, "error rewriting existing data: decompression error");
+ if (!c->opts.no_data_io)
+ bch_err(c, "error rewriting existing data: decompression error");
bio_unmap_or_unbounce(c, data);
return -EIO;
}
/*
- * might have to free existing pages and retry allocation from mempool -
- * do this _after_ decompressing:
+ * XXX: don't have a good way to assert that the bio was allocated with
+ * enough space, we depend on bch2_move_extent doing the right thing
*/
- bch2_bio_alloc_more_pages_pool(c, bio, crc->live_size << 9);
+ bio->bi_iter.bi_size = crc->live_size << 9;
memcpy_to_bio(bio, bio->bi_iter, data.b + (crc->offset << 9));
{
struct bbuf dst_data = { NULL };
size_t dst_len = crc.uncompressed_size << 9;
- int ret = -ENOMEM;
+ int ret;
- if (crc.uncompressed_size > c->sb.encoded_extent_max ||
- crc.compressed_size > c->sb.encoded_extent_max)
+ if (crc.uncompressed_size << 9 > c->opts.encoded_extent_max ||
+ crc.compressed_size << 9 > c->opts.encoded_extent_max)
return -EIO;
dst_data = dst_len == dst_iter.bi_size
if (ret)
goto err;
- if (dst_data.type != BB_NONE)
+ if (dst_data.type != BB_NONE &&
+ dst_data.type != BB_VMAP)
memcpy_to_bio(dst, dst_iter, dst_data.b + (crc.offset << 9));
err:
bio_unmap_or_unbounce(c, dst_data);
void *workspace,
void *dst, size_t dst_len,
void *src, size_t src_len,
- unsigned compression_type)
+ struct bch_compression_opt compression)
{
- switch (compression_type) {
- case BCH_COMPRESSION_LZ4: {
- int len = src_len;
- int ret = LZ4_compress_destSize(
- src, dst,
- &len, dst_len,
- workspace);
-
- if (len < src_len)
- return -len;
+ enum bch_compression_type compression_type =
+ __bch2_compression_opt_to_type[compression.type];
- return ret;
- }
- case BCH_COMPRESSION_GZIP: {
+ switch (compression_type) {
+ 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;
+
+ return ret;
+ } else {
+ int ret = LZ4_compress_HC(
+ src, dst,
+ src_len, dst_len,
+ compression.level,
+ workspace);
+
+ return ret ?: -1;
+ }
+ case BCH_COMPRESSION_TYPE_gzip: {
z_stream strm = {
.next_in = src,
.avail_in = src_len,
};
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);
return strm.total_out;
}
- case BCH_COMPRESSION_ZSTD: {
- ZSTD_CCtx *ctx = ZSTD_initCCtx(workspace,
- ZSTD_CCtxWorkspaceBound(c->zstd_params.cParams));
+ 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, c->zstd_workspace_size);
- size_t len = ZSTD_compressCCtx(ctx,
- dst + 4, dst_len - 4,
+ /*
+ * ZSTD requires that when we decompress we pass in the exact
+ * compressed size - rounding it up to the nearest sector
+ * doesn't work, so we use the first 4 bytes of the buffer for
+ * that.
+ *
+ * Additionally, the ZSTD code seems to have a bug where it will
+ * write just past the end of the buffer - so subtract a fudge
+ * factor (7 bytes) from the dst buffer size to account for
+ * that.
+ */
+ size_t len = zstd_compress_cctx(ctx,
+ dst + 4, dst_len - 4 - 7,
src, src_len,
- c->zstd_params);
- if (ZSTD_isError(len))
+ ¶ms);
+ if (zstd_is_error(len))
return 0;
*((__le32 *) dst) = cpu_to_le32(len);
static unsigned __bio_compress(struct bch_fs *c,
struct bio *dst, size_t *dst_len,
struct bio *src, size_t *src_len,
- unsigned 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;
- BUG_ON(compression_type >= BCH_COMPRESSION_NR);
+ BUG_ON(compression_type >= BCH_COMPRESSION_TYPE_NR);
BUG_ON(!mempool_initialized(&c->compress_workspace[compression_type]));
/* If it's only one block, don't bother trying to compress: */
- if (bio_sectors(src) <= c->opts.block_size)
- return 0;
+ if (src->bi_iter.bi_size <= c->opts.block_size)
+ return BCH_COMPRESSION_TYPE_incompressible;
dst_data = bio_map_or_bounce(c, dst, WRITE);
src_data = bio_map_or_bounce(c, src, READ);
- workspace = mempool_alloc(&c->compress_workspace[compression_type], GFP_NOIO);
+ workspace = mempool_alloc(&c->compress_workspace[compression_type], GFP_NOFS);
*src_len = src->bi_iter.bi_size;
*dst_len = dst->bi_iter.bi_size;
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;
memset(dst_data.b + *dst_len, 0, pad);
*dst_len += pad;
- if (dst_data.type != BB_NONE)
+ if (dst_data.type != BB_NONE &&
+ dst_data.type != BB_VMAP)
memcpy_to_bio(dst, dst->bi_iter, dst_data.b);
BUG_ON(!*dst_len || *dst_len > dst->bi_iter.bi_size);
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 = 0;
+ 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,
- c->sb.encoded_extent_max << 9);
+ c->opts.encoded_extent_max);
/* 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_LZ4_OLD)
- compression_type = BCH_COMPRESSION_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;
static int __bch2_fs_compress_init(struct bch_fs *, u64);
-#define BCH_FEATURE_NONE 0
+#define BCH_FEATURE_none 0
static const unsigned bch2_compression_opt_to_feature[] = {
-#define x(t) [BCH_COMPRESSION_OPT_##t] = BCH_FEATURE_##t,
- BCH_COMPRESSION_TYPES()
+#define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_FEATURE_##t,
+ BCH_COMPRESSION_OPTS()
#undef x
};
-#undef BCH_FEATURE_NONE
+#undef BCH_FEATURE_none
-int __bch2_check_set_has_compressed_data(struct bch_fs *c, u64 f)
+static int __bch2_check_set_has_compressed_data(struct bch_fs *c, u64 f)
{
int ret = 0;
}
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
mempool_exit(&c->compression_bounce[READ]);
}
-static void *mempool_kvpmalloc(gfp_t gfp_mask, void *pool_data)
-{
- size_t size = (size_t)pool_data;
- return kvpmalloc(size, gfp_mask);
-}
-
-void mempool_kvpfree(void *element, void *pool_data)
-{
- size_t size = (size_t)pool_data;
- kvpfree(element, size);
-}
-
-static int mempool_init_kvpmalloc_pool(mempool_t *pool, int min_nr, size_t size)
-{
- return !mempool_initialized(pool)
- ? mempool_init(pool, min_nr, mempool_kvpmalloc,
- mempool_kvpfree, (void *) size)
- : 0;
-}
-
static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
{
- size_t max_extent = c->sb.encoded_extent_max << 9;
- size_t order = get_order(max_extent);
size_t decompress_workspace_size = 0;
- bool decompress_workspace_needed;
- ZSTD_parameters params = ZSTD_getParams(0, max_extent, 0);
+ ZSTD_parameters params = zstd_get_params(zstd_max_clevel(),
+ c->opts.encoded_extent_max);
+
+ c->zstd_workspace_size = zstd_cctx_workspace_bound(¶ms.cParams);
+
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_LZ4, LZ4_MEM_COMPRESS, 0 },
- { BCH_FEATURE_GZIP, BCH_COMPRESSION_GZIP,
+ { BCH_FEATURE_lz4, BCH_COMPRESSION_TYPE_lz4,
+ max_t(size_t, LZ4_MEM_COMPRESS, LZ4HC_MEM_COMPRESS),
+ 0 },
+ { BCH_FEATURE_gzip, BCH_COMPRESSION_TYPE_gzip,
zlib_deflate_workspacesize(MAX_WBITS, DEF_MEM_LEVEL),
zlib_inflate_workspacesize(), },
- { BCH_FEATURE_ZSTD, BCH_COMPRESSION_ZSTD,
- ZSTD_CCtxWorkspaceBound(params.cParams),
- ZSTD_DCtxWorkspaceBound() },
+ { BCH_FEATURE_zstd, BCH_COMPRESSION_TYPE_zstd,
+ c->zstd_workspace_size,
+ zstd_dctx_workspace_bound() },
}, *i;
- int ret = 0;
-
- pr_verbose_init(c->opts, "");
-
- c->zstd_params = params;
+ bool have_compressed = false;
for (i = compression_types;
i < compression_types + ARRAY_SIZE(compression_types);
i++)
- if (features & (1 << i->feature))
- goto have_compressed;
+ have_compressed |= (features & (1 << i->feature)) != 0;
- goto out;
-have_compressed:
+ if (!have_compressed)
+ return 0;
- if (!mempool_initialized(&c->compression_bounce[READ])) {
- ret = mempool_init_page_pool(&c->compression_bounce[READ],
- 1, order);
- if (ret)
- goto out;
- }
+ if (!mempool_initialized(&c->compression_bounce[READ]) &&
+ mempool_init_kvmalloc_pool(&c->compression_bounce[READ],
+ 1, c->opts.encoded_extent_max))
+ return -BCH_ERR_ENOMEM_compression_bounce_read_init;
- if (!mempool_initialized(&c->compression_bounce[WRITE])) {
- ret = mempool_init_page_pool(&c->compression_bounce[WRITE],
- 1, order);
- if (ret)
- goto out;
- }
+ if (!mempool_initialized(&c->compression_bounce[WRITE]) &&
+ mempool_init_kvmalloc_pool(&c->compression_bounce[WRITE],
+ 1, c->opts.encoded_extent_max))
+ return -BCH_ERR_ENOMEM_compression_bounce_write_init;
for (i = compression_types;
i < compression_types + ARRAY_SIZE(compression_types);
if (!(features & (1 << i->feature)))
continue;
- if (i->decompress_workspace)
- decompress_workspace_needed = true;
+ if (mempool_initialized(&c->compress_workspace[i->type]))
+ continue;
- ret = mempool_init_kvpmalloc_pool(
+ if (mempool_init_kvmalloc_pool(
&c->compress_workspace[i->type],
- 1, i->compress_workspace);
- if (ret)
- goto out;
+ 1, i->compress_workspace))
+ return -BCH_ERR_ENOMEM_compression_workspace_init;
}
- ret = mempool_init_kmalloc_pool(
- &c->decompress_workspace,
- 1, decompress_workspace_size);
- if (ret)
- goto out;
-out:
- pr_verbose_init(c->opts, "ret %i", ret);
- return ret;
+ if (!mempool_initialized(&c->decompress_workspace) &&
+ mempool_init_kvmalloc_pool(&c->decompress_workspace,
+ 1, decompress_workspace_size))
+ return -BCH_ERR_ENOMEM_decompression_workspace_init;
+
+ return 0;
+}
+
+static u64 compression_opt_to_feature(unsigned v)
+{
+ unsigned type = bch2_compression_decode(v).type;
+
+ return BIT_ULL(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_compression_opt_to_text(struct printbuf *out, u64 v)
+{
+ struct bch_compression_opt opt = bch2_compression_decode(v);
+
+ if (opt.type < BCH_COMPRESSION_OPT_NR)
+ prt_str(out, bch2_compression_opts[opt.type]);
+ else
+ prt_printf(out, "(unknown compression opt %u)", opt.type);
+ if (opt.level)
+ prt_printf(out, ":%u", opt.level);
+}
+
+void bch2_opt_compression_to_text(struct printbuf *out,
+ struct bch_fs *c,
+ struct bch_sb *sb,
+ u64 v)
+{
+ return bch2_compression_opt_to_text(out, v);
+}
+
+int bch2_opt_compression_validate(u64 v, struct printbuf *err)
+{
+ if (!bch2_compression_opt_valid(v)) {
+ prt_printf(err, "invalid compression opt %llu", v);
+ return -BCH_ERR_invalid_sb_opt_compression;
+ }
+
+ return 0;
}
projects / bcachefs-tools-debian / blobdiff