diff options
Diffstat (limited to 'libbcachefs/compress.c')
| -rw-r--r-- | libbcachefs/compress.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libbcachefs/compress.c b/libbcachefs/compress.c index aebf46bb..f63651d2 100644 --- a/libbcachefs/compress.c +++ b/libbcachefs/compress.c @@ -336,8 +336,19 @@ static int attempt_compress(struct bch_fs *c, ZSTD_CCtx *ctx = ZSTD_initCCtx(workspace, ZSTD_CCtxWorkspaceBound(c->zstd_params.cParams)); + /* + * 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_compressCCtx(ctx, - dst + 4, dst_len - 4, + dst + 4, dst_len - 4 - 7, src, src_len, c->zstd_params); if (ZSTD_isError(len)) |