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bcachefs: Fix zstd compress workspace size

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zstd apparently lies about the size of the compression workspace it
requires; if we double it compression succeeds.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-24 23:12:45 -05:00
parent 3f3ae1250e
commit bbc3a46065
2 changed files with 11 additions and 7 deletions
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2
fs/bcachefs/bcachefs.h
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@ -931,7 +931,7 @@ struct bch_fs {
mempool_t compression_bounce[2];
mempool_t compress_workspace[BCH_COMPRESSION_TYPE_NR];
mempool_t decompress_workspace;
ZSTD_parameters zstd_params;
size_t zstd_workspace_size;
struct crypto_shash *sha256;
struct crypto_sync_skcipher *chacha20;

16
fs/bcachefs/compress.c
View File

@ -354,8 +354,7 @@ static int attempt_compress(struct bch_fs *c,
*/
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(&params.cParams));
ZSTD_CCtx *ctx = zstd_init_cctx(workspace, c->zstd_workspace_size);
/*
* ZSTD requires that when we decompress we pass in the exact
@ -371,7 +370,7 @@ static int attempt_compress(struct bch_fs *c,
size_t len = zstd_compress_cctx(ctx,
dst + 4, dst_len - 4 - 7,
src, src_len,
&c->zstd_params);
&params);
if (zstd_is_error(len))
return 0;
@ -572,6 +571,13 @@ static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
size_t decompress_workspace_size = 0;
ZSTD_parameters params = zstd_get_params(zstd_max_clevel(),
c->opts.encoded_extent_max);
/*
* ZSTD is lying: if we allocate the size of the workspace it says it
* requires, it returns memory allocation errors
*/
c->zstd_workspace_size = zstd_cctx_workspace_bound(&params.cParams);
struct {
unsigned feature;
enum bch_compression_type type;
@ -585,13 +591,11 @@ static int __bch2_fs_compress_init(struct bch_fs *c, u64 features)
zlib_deflate_workspacesize(MAX_WBITS, DEF_MEM_LEVEL),
zlib_inflate_workspacesize(), },
{ BCH_FEATURE_zstd, BCH_COMPRESSION_TYPE_zstd,
zstd_cctx_workspace_bound(&params.cParams),
c->zstd_workspace_size,
zstd_dctx_workspace_bound() },
}, *i;
bool have_compressed = false;
c->zstd_params = params;
for (i = compression_types;
i < compression_types + ARRAY_SIZE(compression_types);
i++)