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-rw-r--r--src/journal/compress.c307
1 files changed, 166 insertions, 141 deletions
diff --git a/src/journal/compress.c b/src/journal/compress.c
index 383f6a6e96..ba734b5561 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
@@ -19,23 +17,36 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/mman.h>
#include <unistd.h>
#ifdef HAVE_XZ
-# include <lzma.h>
+#include <lzma.h>
#endif
#ifdef HAVE_LZ4
-# include <lz4.h>
+#include <lz4.h>
+#include <lz4frame.h>
#endif
+#include "alloc-util.h"
#include "compress.h"
+#include "fd-util.h"
+#include "io-util.h"
+#include "journal-def.h"
#include "macro.h"
-#include "util.h"
#include "sparse-endian.h"
-#include "journal-def.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "util.h"
+
+#ifdef HAVE_LZ4
+DEFINE_TRIVIAL_CLEANUP_FUNC(LZ4F_compressionContext_t, LZ4F_freeCompressionContext);
+DEFINE_TRIVIAL_CLEANUP_FUNC(LZ4F_decompressionContext_t, LZ4F_freeDecompressionContext);
+#endif
#define ALIGN_8(l) ALIGN_TO(l, sizeof(size_t))
@@ -46,14 +57,16 @@ static const char* const object_compressed_table[_OBJECT_COMPRESSED_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(object_compressed, int);
-int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_size) {
+int compress_blob_xz(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size) {
#ifdef HAVE_XZ
static const lzma_options_lzma opt = {
1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT,
- LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4};
- static const lzma_filter filters[2] = {
- {LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt},
- {LZMA_VLI_UNKNOWN, NULL}
+ LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4
+ };
+ static const lzma_filter filters[] = {
+ { LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt },
+ { LZMA_VLI_UNKNOWN, NULL }
};
lzma_ret ret;
size_t out_pos = 0;
@@ -61,6 +74,7 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
assert(src);
assert(src_size > 0);
assert(dst);
+ assert(dst_alloc_size > 0);
assert(dst_size);
/* Returns < 0 if we couldn't compress the data or the
@@ -70,7 +84,7 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
return -ENOBUFS;
ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL,
- src, src_size, dst, &out_pos, src_size - 1);
+ src, src_size, dst, &out_pos, dst_alloc_size);
if (ret != LZMA_OK)
return -ENOBUFS;
@@ -81,13 +95,15 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_
#endif
}
-int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, size_t *dst_size) {
+int compress_blob_lz4(const void *src, uint64_t src_size,
+ void *dst, size_t dst_alloc_size, size_t *dst_size) {
#ifdef HAVE_LZ4
int r;
assert(src);
assert(src_size > 0);
assert(dst);
+ assert(dst_alloc_size > 0);
assert(dst_size);
/* Returns < 0 if we couldn't compress the data or the
@@ -96,7 +112,7 @@ int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, size_t *dst
if (src_size < 9)
return -ENOBUFS;
- r = LZ4_compress_limitedOutput(src, dst + 8, src_size, src_size - 8 - 1);
+ r = LZ4_compress_limitedOutput(src, (char*)dst + 8, src_size, (int) dst_alloc_size - 8);
if (r <= 0)
return -ENOBUFS;
@@ -160,7 +176,7 @@ int decompress_blob_xz(const void *src, uint64_t src_size,
return -ENOMEM;
s.avail_out = space - used;
- s.next_out = *dst + used;
+ s.next_out = *(uint8_t**)dst + used;
}
*dst_size = space - s.avail_out;
@@ -188,7 +204,7 @@ int decompress_blob_lz4(const void *src, uint64_t src_size,
return -EBADMSG;
size = le64toh( *(le64_t*)src );
- if (size < 0 || (le64_t) size != *(le64_t*)src)
+ if (size < 0 || (unsigned) size != le64toh(*(le64_t*)src))
return -EFBIG;
if ((size_t) size > *dst_alloc_size) {
out = realloc(*dst, size);
@@ -199,7 +215,7 @@ int decompress_blob_lz4(const void *src, uint64_t src_size,
} else
out = *dst;
- r = LZ4_decompress_safe(src + 8, out, src_size - 8, size);
+ r = LZ4_decompress_safe((char*)src + 8, out, src_size - 8, size);
if (r < 0 || r != size)
return -EBADMSG;
@@ -275,7 +291,7 @@ int decompress_startswith_xz(const void *src, uint64_t src_size,
if (!(greedy_realloc(buffer, buffer_size, *buffer_size * 2, 1)))
return -ENOMEM;
- s.next_out = *buffer + *buffer_size - s.avail_out;
+ s.next_out = *(uint8_t**)buffer + *buffer_size - s.avail_out;
}
#else
@@ -293,6 +309,7 @@ int decompress_startswith_lz4(const void *src, uint64_t src_size,
* prefix */
int r;
+ size_t size;
assert(src);
assert(src_size > 0);
@@ -307,12 +324,20 @@ int decompress_startswith_lz4(const void *src, uint64_t src_size,
if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1)))
return -ENOMEM;
- r = LZ4_decompress_safe_partial(src + 8, *buffer, src_size - 8,
+ r = LZ4_decompress_safe_partial((char*)src + 8, *buffer, src_size - 8,
prefix_len + 1, *buffer_size);
+ if (r >= 0)
+ size = (unsigned) r;
+ else {
+ /* lz4 always tries to decode full "sequence", so in
+ * pathological cases might need to decompress the
+ * full field. */
+ r = decompress_blob_lz4(src, src_size, buffer, buffer_size, &size, 0);
+ if (r < 0)
+ return r;
+ }
- if (r < 0)
- return -EBADMSG;
- if ((unsigned) r >= prefix_len + 1)
+ if (size >= prefix_len + 1)
return memcmp(*buffer, prefix, prefix_len) == 0 &&
((const uint8_t*) *buffer)[prefix_len] == extra;
else
@@ -342,11 +367,10 @@ int decompress_startswith(int compression,
return -EBADMSG;
}
-int compress_stream_xz(int fdf, int fdt, off_t max_bytes) {
+int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes) {
#ifdef HAVE_XZ
_cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
lzma_ret ret;
-
uint8_t buf[BUFSIZ], out[BUFSIZ];
lzma_action action = LZMA_RUN;
@@ -364,8 +388,8 @@ int compress_stream_xz(int fdf, int fdt, off_t max_bytes) {
size_t m = sizeof(buf);
ssize_t n;
- if (max_bytes != -1 && m > (size_t) max_bytes)
- m = max_bytes;
+ if (max_bytes != (uint64_t) -1 && (uint64_t) m > max_bytes)
+ m = (size_t) max_bytes;
n = read(fdf, buf, m);
if (n < 0)
@@ -376,8 +400,8 @@ int compress_stream_xz(int fdf, int fdt, off_t max_bytes) {
s.next_in = buf;
s.avail_in = n;
- if (max_bytes != -1) {
- assert(max_bytes >= n);
+ if (max_bytes != (uint64_t) -1) {
+ assert(max_bytes >= (uint64_t) n);
max_bytes -= n;
}
}
@@ -417,87 +441,102 @@ int compress_stream_xz(int fdf, int fdt, off_t max_bytes) {
#endif
}
-#define LZ4_BUFSIZE (512*1024)
+#define LZ4_BUFSIZE (512*1024u)
-int compress_stream_lz4(int fdf, int fdt, off_t max_bytes) {
+int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) {
#ifdef HAVE_LZ4
+ LZ4F_errorCode_t c;
+ _cleanup_(LZ4F_freeCompressionContextp) LZ4F_compressionContext_t ctx = NULL;
+ _cleanup_free_ char *buf = NULL;
+ char *src = NULL;
+ size_t size, n, total_in = 0, total_out, offset = 0, frame_size;
+ struct stat st;
+ int r;
+ static const LZ4F_compressOptions_t options = {
+ .stableSrc = 1,
+ };
+ static const LZ4F_preferences_t preferences = {
+ .frameInfo.blockSizeID = 5,
+ };
- _cleanup_free_ char *buf1 = NULL, *buf2 = NULL, *out = NULL;
- char *buf;
- LZ4_stream_t lz4_data = {};
- le32_t header;
- size_t total_in = 0, total_out = sizeof(header);
- ssize_t n;
+ c = LZ4F_createCompressionContext(&ctx, LZ4F_VERSION);
+ if (LZ4F_isError(c))
+ return -ENOMEM;
- assert(fdf >= 0);
- assert(fdt >= 0);
+ if (fstat(fdf, &st) < 0)
+ return log_debug_errno(errno, "fstat() failed: %m");
- buf1 = malloc(LZ4_BUFSIZE);
- buf2 = malloc(LZ4_BUFSIZE);
- out = malloc(LZ4_COMPRESSBOUND(LZ4_BUFSIZE));
- if (!buf1 || !buf2 || !out)
- return log_oom();
+ frame_size = LZ4F_compressBound(LZ4_BUFSIZE, &preferences);
+ size = frame_size + 64*1024; /* add some space for header and trailer */
+ buf = malloc(size);
+ if (!buf)
+ return -ENOMEM;
- buf = buf1;
- for (;;) {
- size_t m;
- int r;
+ n = offset = total_out = LZ4F_compressBegin(ctx, buf, size, &preferences);
+ if (LZ4F_isError(n))
+ return -EINVAL;
- m = LZ4_BUFSIZE;
- if (max_bytes != -1 && m > (size_t) max_bytes - total_in)
- m = max_bytes - total_in;
+ src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fdf, 0);
+ if (src == MAP_FAILED)
+ return -errno;
- n = read(fdf, buf, m);
- if (n < 0)
- return -errno;
- if (n == 0)
- break;
+ log_debug("Buffer size is %zu bytes, header size %zu bytes.", size, n);
- total_in += n;
+ while (total_in < (size_t) st.st_size) {
+ ssize_t k;
- r = LZ4_compress_continue(&lz4_data, buf, out, n);
- if (r == 0) {
- log_error("LZ4 compression failed.");
- return -EBADMSG;
+ k = MIN(LZ4_BUFSIZE, st.st_size - total_in);
+ n = LZ4F_compressUpdate(ctx, buf + offset, size - offset,
+ src + total_in, k, &options);
+ if (LZ4F_isError(n)) {
+ r = -ENOTRECOVERABLE;
+ goto cleanup;
}
- header = htole32(r);
- errno = 0;
+ total_in += k;
+ offset += n;
+ total_out += n;
- n = write(fdt, &header, sizeof(header));
- if (n < 0)
- return -errno;
- if (n != sizeof(header))
- return errno ? -errno : -EIO;
-
- n = loop_write(fdt, out, r, false);
- if (n < 0)
- return n;
+ if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) {
+ log_debug("Compressed stream longer than %"PRIu64" bytes", max_bytes);
+ return -EFBIG;
+ }
- total_out += sizeof(header) + r;
+ if (size - offset < frame_size + 4) {
+ k = loop_write(fdt, buf, offset, false);
+ if (k < 0) {
+ r = k;
+ goto cleanup;
+ }
+ offset = 0;
+ }
+ }
- buf = buf == buf1 ? buf2 : buf1;
+ n = LZ4F_compressEnd(ctx, buf + offset, size - offset, &options);
+ if (LZ4F_isError(n)) {
+ r = -ENOTRECOVERABLE;
+ goto cleanup;
}
- header = htole32(0);
- n = write(fdt, &header, sizeof(header));
- if (n < 0)
- return -errno;
- if (n != sizeof(header))
- return errno ? -errno : -EIO;
+ offset += n;
+ total_out += n;
+ r = loop_write(fdt, buf, offset, false);
+ if (r < 0)
+ goto cleanup;
log_debug("LZ4 compression finished (%zu -> %zu bytes, %.1f%%)",
total_in, total_out,
(double) total_out / total_in * 100);
-
- return 0;
+ cleanup:
+ munmap(src, st.st_size);
+ return r;
#else
return -EPROTONOSUPPORT;
#endif
}
-int decompress_stream_xz(int fdf, int fdt, off_t max_bytes) {
+int decompress_stream_xz(int fdf, int fdt, uint64_t max_bytes) {
#ifdef HAVE_XZ
_cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
@@ -511,7 +550,7 @@ int decompress_stream_xz(int fdf, int fdt, off_t max_bytes) {
ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
if (ret != LZMA_OK) {
- log_error("Failed to initialize XZ decoder: code %u", ret);
+ log_debug("Failed to initialize XZ decoder: code %u", ret);
return -ENOMEM;
}
@@ -537,7 +576,7 @@ int decompress_stream_xz(int fdf, int fdt, off_t max_bytes) {
ret = lzma_code(&s, action);
if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
- log_error("Decompression failed: code %u", ret);
+ log_debug("Decompression failed: code %u", ret);
return -EBADMSG;
}
@@ -546,8 +585,8 @@ int decompress_stream_xz(int fdf, int fdt, off_t max_bytes) {
n = sizeof(out) - s.avail_out;
- if (max_bytes != -1) {
- if (max_bytes < n)
+ if (max_bytes != (uint64_t) -1) {
+ if (max_bytes < (uint64_t) n)
return -EFBIG;
max_bytes -= n;
@@ -567,87 +606,73 @@ int decompress_stream_xz(int fdf, int fdt, off_t max_bytes) {
}
}
#else
- log_error("Cannot decompress file. Compiled without XZ support.");
+ log_debug("Cannot decompress file. Compiled without XZ support.");
return -EPROTONOSUPPORT;
#endif
}
-int decompress_stream_lz4(int fdf, int fdt, off_t max_bytes) {
-
+int decompress_stream_lz4(int in, int out, uint64_t max_bytes) {
#ifdef HAVE_LZ4
- _cleanup_free_ char *buf = NULL, *out = NULL;
- size_t buf_size = 0;
- LZ4_streamDecode_t lz4_data = {};
- le32_t header;
- size_t total_in = sizeof(header), total_out = 0;
-
- assert(fdf >= 0);
- assert(fdt >= 0);
+ size_t c;
+ _cleanup_(LZ4F_freeDecompressionContextp) LZ4F_decompressionContext_t ctx = NULL;
+ _cleanup_free_ char *buf = NULL;
+ char *src;
+ struct stat st;
+ int r = 0;
+ size_t total_in = 0, total_out = 0;
+
+ c = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION);
+ if (LZ4F_isError(c))
+ return -ENOMEM;
- out = malloc(4*LZ4_BUFSIZE);
- if (!out)
- return log_oom();
+ if (fstat(in, &st) < 0)
+ return log_debug_errno(errno, "fstat() failed: %m");
- for (;;) {
- ssize_t m;
- int r;
+ buf = malloc(LZ4_BUFSIZE);
+ if (!buf)
+ return -ENOMEM;
- r = loop_read_exact(fdf, &header, sizeof(header), false);
- if (r < 0)
- return r;
+ src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, in, 0);
+ if (src == MAP_FAILED)
+ return -errno;
- m = le32toh(header);
- if (m == 0)
- break;
+ while (total_in < (size_t) st.st_size) {
+ size_t produced = LZ4_BUFSIZE;
+ size_t used = st.st_size - total_in;
- /* We refuse to use a bigger decompression buffer than
- * the one used for compression by 4 times. This means
- * that compression buffer size can be enlarged 4
- * times. This can be changed, but old binaries might
- * not accept buffers compressed by newer binaries then.
- */
- if (m > LZ4_COMPRESSBOUND(LZ4_BUFSIZE * 4)) {
- log_error("Compressed stream block too big: %zd bytes", m);
- return -EBADMSG;
+ c = LZ4F_decompress(ctx, buf, &produced, src + total_in, &used, NULL);
+ if (LZ4F_isError(c)) {
+ r = -EBADMSG;
+ goto cleanup;
}
- total_in += sizeof(header) + m;
-
- if (!GREEDY_REALLOC(buf, buf_size, m))
- return log_oom();
-
- r = loop_read_exact(fdf, buf, m, false);
- if (r < 0)
- return r;
-
- r = LZ4_decompress_safe_continue(&lz4_data, buf, out, m, 4*LZ4_BUFSIZE);
- if (r <= 0)
- log_error("LZ4 decompression failed.");
+ total_in += used;
+ total_out += produced;
- total_out += r;
-
- if (max_bytes != -1 && total_out > (size_t) max_bytes) {
- log_debug("Decompressed stream longer than %zd bytes", max_bytes);
- return -EFBIG;
+ if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) {
+ log_debug("Decompressed stream longer than %"PRIu64" bytes", max_bytes);
+ r = -EFBIG;
+ goto cleanup;
}
- r = loop_write(fdt, out, r, false);
+ r = loop_write(out, buf, produced, false);
if (r < 0)
- return r;
+ goto cleanup;
}
log_debug("LZ4 decompression finished (%zu -> %zu bytes, %.1f%%)",
total_in, total_out,
(double) total_out / total_in * 100);
-
- return 0;
+ cleanup:
+ munmap(src, st.st_size);
+ return r;
#else
- log_error("Cannot decompress file. Compiled without LZ4 support.");
+ log_debug("Cannot decompress file. Compiled without LZ4 support.");
return -EPROTONOSUPPORT;
#endif
}
-int decompress_stream(const char *filename, int fdf, int fdt, off_t max_bytes) {
+int decompress_stream(const char *filename, int fdf, int fdt, uint64_t max_bytes) {
if (endswith(filename, ".lz4"))
return decompress_stream_lz4(fdf, fdt, max_bytes);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-22 23:44:38 +0000