@@ -25,6 +25,7 @@ ifeq ($(VSOCK_DEFINED), 1)
OBJS += trace-timesync-ptp.o
OBJS += trace-timesync-kvm.o
endif
+OBJS += trace-compress.o
# Additional util objects
OBJS += trace-blk-hack.o
@@ -35,6 +35,7 @@ int *tracecmd_add_id(int *list, int id, int len);
#define FILE_VERSION_MAX 7
#define FILE_VERSION_SECTIONS 7
+#define FILE_VERSION_COMPRESSION 7
enum {
RINGBUF_TYPE_PADDING = 29,
@@ -154,6 +155,7 @@ enum {
TRACECMD_FL_IN_USECS = (1 << 2),
TRACECMD_FL_RAW_TS = (1 << 3),
TRACECMD_FL_SECTIONED = (1 << 4),
+ TRACECMD_FL_COMPRESSION = (1 << 5),
};
struct tracecmd_ftrace {
@@ -485,6 +487,45 @@ void tracecmd_tsync_free(struct tracecmd_time_sync *tsync);
int tracecmd_write_guest_time_shift(struct tracecmd_output *handle,
struct tracecmd_time_sync *tsync);
+/* --- Compression --- */
+struct tracecmd_compress_chunk {
+ unsigned int size;
+ unsigned int zsize;
+ off64_t zoffset;
+ off64_t offset;
+};
+struct tracecmd_compression;
+struct tracecmd_compression *tracecmd_compress_alloc(const char *name, const char *version,
+ int fd, struct tep_handle *tep,
+ struct tracecmd_msg_handle *msg_handle);
+void tracecmd_compress_destroy(struct tracecmd_compression *handle);
+int tracecmd_compress_block(struct tracecmd_compression *handle);
+int tracecmd_uncompress_block(struct tracecmd_compression *handle);
+void tracecmd_compress_reset(struct tracecmd_compression *handle);
+int tracecmd_compress_read(struct tracecmd_compression *handle, char *dst, int len);
+int tracecmd_compress_pread(struct tracecmd_compression *handle, char *dst, int len, off_t offset);
+int tracecmd_compress_write(struct tracecmd_compression *handle,
+ const void *data, unsigned long long size);
+off64_t tracecmd_compress_lseek(struct tracecmd_compression *handle, off64_t offset, int whence);
+int tracecmd_compress_proto_get_name(struct tracecmd_compression *compress,
+ const char **name, const char **version);
+bool tracecmd_compress_is_supported(const char *name, const char *version);
+int tracecmd_compress_protos_get(char ***names, char ***versions);
+int tracecmd_compress_proto_register(const char *name, const char *version, int weight,
+ int (*compress)(const char *in, unsigned int in_bytes,
+ char *out, unsigned int *out_bytes),
+ int (*uncompress)(const char *in, unsigned int in_bytes,
+ char *out, unsigned int *out_bytes),
+ unsigned int (*comress_size)(unsigned int bytes),
+ bool (*is_supported)(const char *name, const char *version));
+int tracecmd_compress_copy_from(struct tracecmd_compression *handle, int fd, int chunk_size,
+ unsigned long long *read_size, unsigned long long *write_size);
+int tracecmd_uncompress_copy_to(struct tracecmd_compression *handle, int fd,
+ unsigned long long *read_size, unsigned long long *write_size);
+int tracecmd_uncompress_chunk(struct tracecmd_compression *handle,
+ struct tracecmd_compress_chunk *chunk, char *data);
+int tracecmd_load_chunks_info(struct tracecmd_compression *handle,
+ struct tracecmd_compress_chunk **chunks_info);
/* --- Plugin handling --- */
extern struct tep_plugin_option trace_ftrace_options[];
@@ -36,6 +36,9 @@ struct data_file_write {
unsigned long long file_data_offset;
};
+void tracecmd_compress_init(void);
+void tracecmd_compress_free(void);
+
bool check_file_state(unsigned long file_version, int current_state, int new_state);
bool check_out_state(struct tracecmd_output *handle, int new_state);
new file mode 100644
@@ -0,0 +1,907 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2021, VMware, Tzvetomir Stoyanov tz.stoyanov@gmail.com>
+ *
+ */
+#include <stdlib.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "trace-cmd-private.h"
+#include "trace-cmd-local.h"
+
+struct compress_proto {
+ struct compress_proto *next;
+ char *proto_name;
+ char *proto_version;
+ int weight;
+
+ int (*compress_block)(const char *in, unsigned int in_bytes,
+ char *out, unsigned int *out_bytes);
+ int (*uncompress_block)(const char *in, unsigned int in_bytes,
+ char *out, unsigned int *out_bytes);
+ unsigned int (*compress_size)(unsigned int bytes);
+ bool (*is_supported)(const char *name, const char *version);
+};
+
+static struct compress_proto *proto_list;
+
+struct tracecmd_compression {
+ int fd;
+ unsigned int capacity;
+ unsigned long pointer;
+ char *buffer;
+ struct compress_proto *proto;
+ struct tep_handle *tep;
+ struct tracecmd_msg_handle *msg_handle;
+};
+
+static int read_fd(int fd, char *dst, int len)
+{
+ size_t size = 0;
+ int r;
+
+ do {
+ r = read(fd, dst+size, len);
+ if (r > 0) {
+ size += r;
+ len -= r;
+ } else
+ break;
+ } while (r > 0);
+
+ if (len)
+ return -1;
+ return size;
+}
+
+static long long write_fd(int fd, const void *data, size_t size)
+{
+ long long tot = 0;
+ long long w;
+
+ do {
+ w = write(fd, data + tot, size - tot);
+ tot += w;
+
+ if (!w)
+ break;
+ if (w < 0)
+ return w;
+ } while (tot != size);
+
+ return tot;
+}
+
+static long long do_write(struct tracecmd_compression *handle,
+ const void *data, unsigned long long size)
+{
+ int ret;
+
+ if (handle->msg_handle) {
+ ret = tracecmd_msg_data_send(handle->msg_handle, data, size);
+ if (ret)
+ return -1;
+ return size;
+ }
+ return write_fd(handle->fd, data, size);
+}
+
+static inline int buffer_extend(struct tracecmd_compression *handle, unsigned int size)
+{
+ int extend;
+ char *buf;
+
+ if (size <= handle->capacity)
+ return 0;
+
+ extend = ((size - handle->capacity) / BUFSIZ + 1) * BUFSIZ;
+ buf = realloc(handle->buffer, handle->capacity + extend);
+ if (!buf)
+ return -1;
+ handle->buffer = buf;
+ handle->capacity += extend;
+
+ return 0;
+}
+
+/**
+ * tracecmd_compress_lseek - Move the read/write pointer into the compression buffer
+ * @handle: compression handle
+ * @offset: number of bytes to move the pointer, can be negative or positive
+ * @whence: the starting position of the pointer movement,
+ *
+ * Returns the new file pointer on success, or -1 in case of an error.
+ */
+off64_t tracecmd_compress_lseek(struct tracecmd_compression *handle, off64_t offset, int whence)
+{
+ unsigned long p;
+
+ if (!handle || !handle->buffer)
+ return (off64_t)-1;
+
+ switch (whence) {
+ case SEEK_CUR:
+ p = handle->pointer + offset;
+ break;
+ case SEEK_END:
+ p = handle->capacity + offset;
+ break;
+ case SEEK_SET:
+ p = offset;
+ break;
+ default:
+ return (off64_t)-1;
+ }
+
+ if (buffer_extend(handle, p))
+ return (off64_t)-1;
+
+ handle->pointer = p;
+
+ return p;
+}
+
+static int compress_read(struct tracecmd_compression *handle, char *dst, int len)
+{
+ int s;
+
+ if (handle->pointer + len > handle->capacity)
+ s = handle->capacity - handle->pointer;
+ else
+ s = len;
+ memcpy(dst, handle->buffer + handle->pointer, s);
+
+ return s;
+}
+
+/**
+ * tracecmd_compress_pread - pread() on compression buffer
+ * @handle: compression handle
+ * @dst: return, store the read data
+ * @len: length of data to be read
+ * @offset: offset in the buffer of data to be read
+ *
+ * Read a @len of data from the compression buffer at given @offset,
+ * without updating the buffer pointer.
+ *
+ * On success returns the number of bytes read, or -1 on failure.
+ */
+int tracecmd_compress_pread(struct tracecmd_compression *handle, char *dst, int len, off_t offset)
+{
+ int ret;
+
+ if (!handle || !handle->buffer || offset > handle->capacity)
+ return -1;
+
+ ret = tracecmd_compress_lseek(handle, offset, SEEK_SET);
+ if (ret < 0)
+ return ret;
+ return compress_read(handle, dst, len);
+}
+
+/**
+ * tracecmd_compress_read - read() from compression buffer
+ * @handle: compression handle
+ * @dst: return, store the read data
+ * @len: length of data to be read
+ *
+ * Read a @len of data from the compression buffer
+ *
+ * On success returns the number of bytes read, or -1 on failure.
+ */
+int tracecmd_compress_read(struct tracecmd_compression *handle, char *dst, int len)
+{
+ int ret;
+
+ if (!handle || !handle->buffer)
+ return -1;
+
+ ret = compress_read(handle, dst, len);
+ if (ret > 0)
+ handle->pointer += ret;
+
+ return ret;
+}
+
+/**
+ * tracecmd_compress_reset - Reset the compression buffer
+ * @handle: compression handle
+ *
+ * Reset the compression buffer, any data currently in the buffer will be destroyed.
+ *
+ */
+void tracecmd_compress_reset(struct tracecmd_compression *handle)
+{
+ if (!handle)
+ return;
+
+ free(handle->buffer);
+ handle->buffer = NULL;
+ handle->pointer = 0;
+ handle->capacity = 0;
+}
+
+/**
+ * tracecmd_uncompress_block - uncompress a memory block
+ * @handle: compression handle
+ *
+ * Read compressed memory block from the file and uncompress it into internal buffer.
+ * The tracecmd_compress_read() can be used to read the uncompressed data from the buffer
+ *
+ * Returns 0 on success, or -1 in case of an error.
+ */
+int tracecmd_uncompress_block(struct tracecmd_compression *handle)
+{
+ unsigned int s_uncompressed;
+ unsigned int s_compressed;
+ char *bytes = NULL;
+ char buf[4];
+ int ret;
+
+ if (!handle || !handle->proto || !handle->proto->uncompress_block)
+ return -1;
+ tracecmd_compress_reset(handle);
+
+ if (read(handle->fd, buf, 4) != 4)
+ return -1;
+ s_compressed = tep_read_number(handle->tep, buf, 4);
+ if (read(handle->fd, buf, 4) != 4)
+ return -1;
+ s_uncompressed = tep_read_number(handle->tep, buf, 4);
+
+ handle->buffer = malloc(s_uncompressed);
+ if (!handle->buffer)
+ return -1;
+ bytes = malloc(s_compressed);
+ if (!bytes)
+ goto error;
+
+ if (read_fd(handle->fd, bytes, s_compressed) < 0)
+ goto error;
+ ret = handle->proto->uncompress_block(bytes, s_compressed,
+ handle->buffer, &s_uncompressed);
+ if (ret)
+ goto error;
+ free(bytes);
+ handle->pointer = 0;
+ handle->capacity = s_uncompressed;
+ return 0;
+error:
+ tracecmd_compress_reset(handle);
+ free(bytes);
+ return -1;
+}
+
+/**
+ * tracecmd_compress_block - compress a memory block
+ * @handle: compression handle
+ *
+ * Compress the content of the internal memory buffer and write the compressed data in the file
+ * The tracecmd_compress_write() can be used to write data into the internal memory buffer, before
+ * calling this API.
+ *
+ * Returns 0 on success, or -1 in case of an error.
+ */
+int tracecmd_compress_block(struct tracecmd_compression *handle)
+{
+ unsigned int size;
+ char *buf;
+ int endian4;
+ int ret;
+
+ if (!handle || !handle->proto ||
+ !handle->proto->compress_size || !handle->proto->compress_block)
+ return -1;
+
+ size = handle->proto->compress_size(handle->pointer);
+ buf = malloc(size);
+ if (!buf)
+ return -1;
+ ret = handle->proto->compress_block(handle->buffer, handle->pointer, buf, &size);
+ if (ret < 0)
+ goto out;
+ /* Write compressed data size */
+ endian4 = tep_read_number(handle->tep, &size, 4);
+ ret = do_write(handle, &endian4, 4);
+ if (ret != 4)
+ goto out;
+ /* Write uncompressed data size */
+ endian4 = tep_read_number(handle->tep, &handle->pointer, 4);
+ ret = do_write(handle, &endian4, 4);
+ if (ret != 4)
+ goto out;
+ /* Write compressed data */
+ ret = do_write(handle, buf, size);
+ ret = ((ret == size) ? 0 : -1);
+out:
+ tracecmd_compress_reset(handle);
+ free(buf);
+ return ret;
+}
+
+/**
+ * tracecmd_compress_write - write() to compression buffer
+ * @handle: compression handle
+ * @data: data to be written
+ * @size: size of @data
+ *
+ * Write @data of @size in the compression buffer
+ *
+ * Returns 0 on success, or -1 on failure.
+ */
+int tracecmd_compress_write(struct tracecmd_compression *handle,
+ const void *data, unsigned long long size)
+{
+ if (!handle)
+ return -1;
+
+ if (buffer_extend(handle, (handle->pointer + size)))
+ return -1;
+
+ memcpy(&handle->buffer[handle->pointer], data, size);
+ handle->pointer += size;
+ return 0;
+}
+
+/**
+ * tracecmd_compress_init - initialize the library with available compression algorithms
+ */
+void tracecmd_compress_init(void)
+{
+ struct timeval time;
+
+ gettimeofday(&time, NULL);
+ srand((time.tv_sec * 1000) + (time.tv_usec / 1000));
+
+}
+
+static struct compress_proto *compress_proto_select(void)
+{
+ struct compress_proto *proto = proto_list;
+ struct compress_proto *selected = NULL;
+
+ while (proto) {
+ if (!selected || selected->weight > proto->weight)
+ selected = proto;
+ proto = proto->next;
+ }
+
+ return selected;
+}
+
+/**
+ * tracecmd_compress_alloc - Allocate a new compression context
+ * @name: name of the compression algorithm, if NULL - auto select the best available algorithm
+ * @version: version of the compression algorithm, can be NULL
+ * @fd: file descriptor for reading / writing data
+ * @tep: tep handle, used to encode the data
+ * @msg_handle: message handle, use it for reading / writing data instead of @fd
+ *
+ * Returns NULL on failure or pointer to allocated compression context.
+ * The returned context must be freed by tracecmd_compress_destroy()
+ */
+struct tracecmd_compression *tracecmd_compress_alloc(const char *name, const char *version,
+ int fd, struct tep_handle *tep,
+ struct tracecmd_msg_handle *msg_handle)
+{
+ struct tracecmd_compression *new;
+ struct compress_proto *proto;
+
+ if (name) {
+ proto = proto_list;
+ while (proto) {
+ if (proto->is_supported && proto->is_supported(name, version))
+ break;
+ proto = proto->next;
+ }
+ } else {
+ proto = compress_proto_select();
+ }
+ if (!proto)
+ return NULL;
+
+ new = calloc(1, sizeof(*new));
+ if (!new)
+ return NULL;
+ new->fd = fd;
+ new->tep = tep;
+ new->msg_handle = msg_handle;
+ new->proto = proto;
+ return new;
+}
+
+/**
+ * tracecmd_compress_destroy - Free a compression context
+ * @handle: handle to the compression context that will be freed
+ */
+void tracecmd_compress_destroy(struct tracecmd_compression *handle)
+{
+ tracecmd_compress_reset(handle);
+ free(handle);
+}
+
+/**
+ * tracecmd_compress_is_supported - check if compression algorithm with given name and
+ * version is supported
+ * @name: name of the compression algorithm.
+ * @version: version of the compression algorithm.
+ *
+ * Returns true if the algorithm with given name and version is supported or false if it is not.
+ */
+bool tracecmd_compress_is_supported(const char *name, const char *version)
+{
+ struct compress_proto *proto = proto_list;
+
+ if (!name)
+ return NULL;
+
+ while (proto) {
+ if (proto->is_supported && proto->is_supported(name, version))
+ return true;
+ proto = proto->next;
+ }
+ return false;
+}
+
+/**
+ * tracecmd_compress_proto_get_name - get name and version of compression algorithm
+ * @compress: compression handle.
+ * @name: return, name of the compression algorithm.
+ * @version: return, version of the compression algorithm.
+ *
+ * Returns 0 on success, or -1 in case of an error. If 0 is returned, the name and version of the
+ * algorithm are stored in @name and @version. The returned strings must *not* be freed.
+ */
+int tracecmd_compress_proto_get_name(struct tracecmd_compression *compress,
+ const char **name, const char **version)
+{
+ if (!compress || !compress->proto)
+ return -1;
+ if (name)
+ *name = compress->proto->proto_name;
+ if (version)
+ *version = compress->proto->proto_version;
+ return 0;
+}
+
+/**
+ * tracecmd_compress_proto_register - register a new compression algorithm
+ * @name: name of the compression algorithm.
+ * @version: version of the compression algorithm.
+ * @weight: weight of the compression algorithm, lower is better.
+ * @compress: compression hook, called to compress a memory block.
+ * @uncompress: uncompression hook, called to uncompress a memory block.
+ * @compress_size: hook, called to get the required minimum size of the buffer for compression
+ * given number of bytes.
+ * @is_supported: check hook, called to check if compression with given name and version is
+ * supported by this plugin.
+ *
+ * Returns 0 on success, or -1 in case of an error. If algorithm with given name and version is
+ * already registered, -1 is returned.
+ */
+int tracecmd_compress_proto_register(const char *name, const char *version, int weight,
+ int (*compress)(const char *in, unsigned int in_bytes,
+ char *out, unsigned int *out_bytes),
+ int (*uncompress)(const char *in, unsigned int in_bytes,
+ char *out, unsigned int *out_bytes),
+ unsigned int (*compress_size)(unsigned int bytes),
+ bool (*is_supported)(const char *name, const char *version))
+{
+ struct compress_proto *new;
+
+ if (!name || !compress || !uncompress)
+ return -1;
+ if (tracecmd_compress_is_supported(name, version))
+ return -1;
+
+ new = calloc(1, sizeof(*new));
+ if (!new)
+ return -1;
+
+ new->proto_name = strdup(name);
+ if (!new->proto_name)
+ goto error;
+ new->proto_version = strdup(version);
+ if (!new->proto_version)
+ goto error;
+ new->compress_block = compress;
+ new->uncompress_block = uncompress;
+ new->compress_size = compress_size;
+ new->is_supported = is_supported;
+ new->weight = weight;
+ new->next = proto_list;
+ proto_list = new;
+ return 0;
+
+error:
+ free(new->proto_name);
+ free(new->proto_version);
+ free(new);
+ return -1;
+}
+
+/**
+ * tracecmd_compress_free - free the library resources, related to available compression algorithms
+ *
+ */
+void tracecmd_compress_free(void)
+{
+ struct compress_proto *proto = proto_list;
+ struct compress_proto *del;
+
+ while (proto) {
+ del = proto;
+ proto = proto->next;
+ free(del->proto_name);
+ free(del->proto_version);
+ free(del);
+ }
+ proto_list = NULL;
+}
+
+/**
+ * tracecmd_compress_protos_get - get a list of all supported compression algorithms and versions
+ * @names: return, array with names of all supported compression algorithms
+ * @versions: return, array with versions of all supported compression algorithms
+ *
+ * On success, the size of @names and @versions arrays is returned. Those arrays are allocated by
+ * the API and must be freed with free() by the caller. Both arrays are with same size, each name
+ * from @names corresponds to a version from @versions.
+ * On error -1 is returned and @names and @versions arrays are not allocated.
+ */
+int tracecmd_compress_protos_get(char ***names, char ***versions)
+{
+ struct compress_proto *proto = proto_list;
+ char **n = NULL;
+ char **v = NULL;
+ int c, i;
+
+ for (c = 0; proto; proto = proto->next)
+ c++;
+
+ if (c < 1)
+ return c;
+
+ n = calloc(c, sizeof(char *));
+ if (!n)
+ goto error;
+ v = calloc(c, sizeof(char *));
+ if (!v)
+ goto error;
+
+ proto = proto_list;
+ for (i = 0; i < c && proto; i++) {
+ n[i] = proto->proto_name;
+ v[i] = proto->proto_version;
+ proto = proto->next;
+ }
+
+ *names = n;
+ *versions = v;
+ return c;
+
+error:
+ free(n);
+ free(v);
+ return -1;
+}
+
+/**
+ * tracecmd_compress_copy_from - Copy and compress data from a file
+ * @handle: compression handle
+ * @fd: file descriptor to uncompressed data to copy from
+ * @chunk_size: size of one compression chunk
+ * @read_size: in - max bytes to read from @fd, 0 to read till the EOF
+ * out - size of the uncompressed data read from @fd
+ * @write_size: return, size of the compressed data written into @handle
+ *
+ * This function reads uncompressed data from given @fd, compresses the data using the @handle
+ * compression context and writes the compressed data into the fd associated with the @handle.
+ * The data is compressed on chunks with given @chunk_size size.
+ * The compressed data is written in the format:
+ * - 4 bytes, chunks count
+ * - for each chunk:
+ * - 4 bytes, size of compressed data in this chunk
+ * - 4 bytes, uncompressed size of the data in this chunk
+ * - data, bytes of <size of compressed data in this chunk>
+ *
+ * On success 0 is returned, @read_size and @write_size are updated with the size of
+ * read and written data.
+ */
+int tracecmd_compress_copy_from(struct tracecmd_compression *handle, int fd, int chunk_size,
+ unsigned long long *read_size, unsigned long long *write_size)
+{
+ unsigned int rchunk = 0;
+ unsigned int chunks = 0;
+ unsigned int wsize = 0;
+ unsigned int rsize = 0;
+ unsigned int rmax = 0;
+ unsigned int csize;
+ unsigned int size;
+ unsigned int all;
+ unsigned int r;
+ off64_t offset;
+ char *buf_from;
+ char *buf_to;
+ int endian4;
+ int ret;
+
+ if (!handle || !handle->proto ||
+ !handle->proto->compress_block || !handle->proto->compress_size)
+ return 0;
+ if (read_size)
+ rmax = *read_size;
+ csize = handle->proto->compress_size(chunk_size);
+ buf_from = malloc(chunk_size);
+ if (!buf_from)
+ return -1;
+ buf_to = malloc(csize);
+ if (!buf_to)
+ return -1;
+ /* save the initial offset and write 0 chunks */
+ offset = lseek64(handle->fd, 0, SEEK_CUR);
+ write_fd(handle->fd, &chunks, 4);
+
+ do {
+ all = 0;
+ if (rmax > 0 && (rmax - rsize) < chunk_size)
+ rchunk = (rmax - rsize);
+ else
+ rchunk = chunk_size;
+
+ do {
+ r = read(fd, buf_from + all, rchunk - all);
+ all += r;
+
+ if (r <= 0)
+ break;
+ } while (all != rchunk);
+
+
+ if (r < 0 || (rmax > 0 && rsize >= rmax))
+ break;
+ rsize += all;
+ size = csize;
+ if (all > 0) {
+ ret = handle->proto->compress_block(buf_from, all, buf_to, &size);
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ /* Write compressed data size */
+ endian4 = tep_read_number(handle->tep, &size, 4);
+ ret = write_fd(handle->fd, &endian4, 4);
+ if (ret != 4)
+ break;
+ /* Write uncompressed data size */
+ endian4 = tep_read_number(handle->tep, &all, 4);
+ ret = write_fd(handle->fd, &endian4, 4);
+ if (ret != 4)
+ break;
+ /* Write the compressed data */
+ ret = write_fd(handle->fd, buf_to, size);
+ if (ret != size)
+ break;
+ /* data + compress header */
+ wsize += (size + 8);
+ chunks++;
+ }
+ } while (all > 0);
+ free(buf_from);
+ free(buf_to);
+ if (all)
+ return -1;
+ if (lseek64(handle->fd, offset, SEEK_SET) == (off_t)-1)
+ return -1;
+ endian4 = tep_read_number(handle->tep, &chunks, 4);
+ /* write chunks count*/
+ write_fd(handle->fd, &chunks, 4);
+ lseek64(handle->fd, offset, SEEK_SET);
+ if (lseek64(handle->fd, 0, SEEK_END) == (off_t)-1)
+ return -1;
+ if (read_size)
+ *read_size = rsize;
+ if (write_size)
+ *write_size = wsize;
+ return 0;
+}
+
+/**
+ * tracecmd_load_chunks_info - Read compression chunks information from the file
+ * @handle: compression handle
+ * @chunks_info: return, array with compression chunks information
+ *
+ * This function reads information of all compression chunks in the current compression block from
+ * the file and fills that information in a newly allocated array @chunks_info which is returned.
+ *
+ * On success count of compression chunks is returned. Array of that count is allocated and
+ * returned in @chunks_info. Each entry describes one compression chunk. On error -1 is returned.
+ * In case of success, @chunks_info must be freed by free().
+ */
+int tracecmd_load_chunks_info(struct tracecmd_compression *handle,
+ struct tracecmd_compress_chunk **chunks_info)
+{
+ struct tracecmd_compress_chunk *chunks = NULL;
+ unsigned long long size = 0;
+ unsigned int count = 0;
+ off64_t offset;
+ int ret = -1;
+ char buf[4];
+ int i;
+
+ if (!handle)
+ return -1;
+
+ offset = lseek64(handle->fd, 0, SEEK_CUR);
+ if (offset == (off64_t)-1)
+ return -1;
+
+ if (read(handle->fd, buf, 4) != 4)
+ return -1;
+ count = tep_read_number(handle->tep, buf, 4);
+ if (!count) {
+ ret = 0;
+ goto out;
+ }
+ chunks = calloc(count, sizeof(struct tracecmd_compress_chunk));
+ if (!chunks)
+ goto out;
+ for (i = 0; i < count; i++) {
+ chunks[i].zoffset = lseek64(handle->fd, 0, SEEK_CUR);
+ if (chunks[i].zoffset == (off_t)-1)
+ goto out;
+ if (read(handle->fd, buf, 4) != 4)
+ goto out;
+ chunks[i].zsize = tep_read_number(handle->tep, buf, 4);
+ chunks[i].offset = size;
+ if (read(handle->fd, buf, 4) != 4)
+ goto out;
+ chunks[i].size = tep_read_number(handle->tep, buf, 4);
+ size += chunks[i].size;
+ if (lseek64(handle->fd, chunks[i].zsize, SEEK_CUR) == (off64_t)-1)
+ goto out;
+ }
+
+ ret = count;
+out:
+ if (lseek64(handle->fd, offset, SEEK_SET) == (off64_t)-1)
+ ret = -1;
+
+ if (ret > 0 && chunks_info)
+ *chunks_info = chunks;
+ else
+ free(chunks);
+
+ return ret;
+}
+
+/**
+ * tracecmd_uncompress_chunk - Uncompress given compression chunk.
+ * @handle: compression handle
+ * @chunk: chunk, that will be uncompressed in @data
+ * @data: Preallocated memory for uncompressed data. Must have enough space to hold
+ * the uncompressed data
+ *
+ * This function uncompresses the chunk described by @chunk and stores the uncompressed data in
+ * the preallocated memory @data.
+ *
+ * On success 0 is returned and the uncompressed data is stored in @data. On error -1 is returned.
+ */
+int tracecmd_uncompress_chunk(struct tracecmd_compression *handle,
+ struct tracecmd_compress_chunk *chunk, char *data)
+{
+ char *bytes_in = NULL;
+ unsigned int size;
+ int ret = -1;
+
+ if (!handle || !handle->proto || !handle->proto->uncompress_block || !chunk || !data)
+ return -1;
+
+ if (lseek64(handle->fd, chunk->zoffset + 8, SEEK_SET) == (off_t)-1)
+ return -1;
+ bytes_in = malloc(chunk->zsize);
+ if (!bytes_in)
+ return -1;
+ if (read_fd(handle->fd, bytes_in, chunk->zsize) < 0)
+ goto out;
+ size = chunk->size;
+ if (handle->proto->uncompress_block(bytes_in, chunk->zsize, data, &size))
+ goto out;
+ ret = 0;
+out:
+ free(bytes_in);
+ return ret;
+}
+
+/**
+ * tracecmd_uncompress_copy_to - Uncompress data and copy to a file
+ * @handle: compression handle
+ * @fd: file descriptor to uncompressed data to copy into
+ * @read_size: return, size of the compressed data read from @handle
+ * @write_size: return, size of the uncompressed data written into @fd
+ *
+ * This function reads compressed data from the fd, associated with @handle, uncompresses it
+ * using the @handle compression context and writes the uncompressed data into the fd.
+ * The compressed data must be in the format:
+ * - 4 bytes, chunks count
+ * - for each chunk:
+ * - 4 bytes, size of compressed data in this chunk
+ * - 4 bytes, uncompressed size of the data in this chunk
+ * - data, bytes of <size of compressed data in this chunk>
+ *
+ * On success 0 is returned, @read_size and @write_size are updated with the size of
+ * read and written data.
+ */
+int tracecmd_uncompress_copy_to(struct tracecmd_compression *handle, int fd,
+ unsigned long long *read_size, unsigned long long *write_size)
+{
+ unsigned int s_uncompressed;
+ unsigned int s_compressed;
+ unsigned int rsize = 0;
+ unsigned int wsize = 0;
+ char *bytes_out = NULL;
+ char *bytes_in = NULL;
+ int size_out = 0;
+ int size_in = 0;
+ int chunks;
+ char buf[4];
+ char *tmp;
+ int ret;
+
+ if (!handle || !handle->proto || !handle->proto->uncompress_block)
+ return -1;
+
+ if (read(handle->fd, buf, 4) != 4)
+ return -1;
+ chunks = tep_read_number(handle->tep, buf, 4);
+ rsize += 4;
+ while (chunks) {
+ if (read(handle->fd, buf, 4) != 4)
+ break;
+ s_compressed = tep_read_number(handle->tep, buf, 4);
+ rsize += 4;
+ if (read(handle->fd, buf, 4) != 4)
+ break;
+ s_uncompressed = tep_read_number(handle->tep, buf, 4);
+ rsize += 4;
+ if (!bytes_in || size_in < s_compressed) {
+ tmp = realloc(bytes_in, s_compressed);
+ if (!tmp)
+ break;
+ bytes_in = tmp;
+ size_in = s_compressed;
+ }
+
+ if (!bytes_out || size_out < s_uncompressed) {
+ tmp = realloc(bytes_out, s_uncompressed);
+ if (!tmp)
+ break;
+ bytes_out = tmp;
+ size_out = s_uncompressed;
+ }
+
+ if (read_fd(handle->fd, bytes_in, s_compressed) < 0)
+ break;
+ rsize += s_compressed;
+ ret = handle->proto->uncompress_block(bytes_in, s_compressed,
+ bytes_out, &s_uncompressed);
+ if (ret)
+ break;
+ write_fd(fd, bytes_out, s_uncompressed);
+ wsize += s_uncompressed;
+ chunks--;
+ }
+ free(bytes_in);
+ free(bytes_out);
+ if (chunks)
+ return -1;
+ if (read_size)
+ *read_size = rsize;
+ if (write_size)
+ *write_size = wsize;
+ return 0;
+}
@@ -635,6 +635,16 @@ bool tracecmd_is_version_supported(unsigned int version)
return false;
}
+static void __attribute__ ((constructor)) tracecmd_lib_init(void)
+{
+ tracecmd_compress_init();
+}
+
+static void __attribute__((destructor)) tracecmd_lib_free(void)
+{
+ tracecmd_compress_free();
+}
+
__hidden bool check_file_state(unsigned long file_version, int current_state, int new_state)
{
switch (new_state) {
Added infrastructure to trace-cmd library for compression. Introduced various new APIs to work with this new functionality: struct tracecmd_compression tracecmd_compress_init() tracecmd_compress_free() tracecmd_compress_alloc() tracecmd_compress_destroy() tracecmd_compress_block() tracecmd_uncompress_block() tracecmd_compress_reset() tracecmd_compress_read() tracecmd_compress_pread() tracecmd_compress_write() tracecmd_compress_lseek() tracecmd_compress_proto_get_name() tracecmd_compress_is_supported() tracecmd_compress_protos_get() tracecmd_compress_proto_register() tracecmd_compress_copy_from() tracecmd_uncompress_copy_to() tracecmd_uncompress_chunk() tracecmd_load_chunks_info() The compression algorithms are not part of this patch. Added trace-cmd library constructor and destructor routines, used to initialize and free compression context. Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com> --- lib/trace-cmd/Makefile | 1 + .../include/private/trace-cmd-private.h | 41 + lib/trace-cmd/include/trace-cmd-local.h | 3 + lib/trace-cmd/trace-compress.c | 907 ++++++++++++++++++ lib/trace-cmd/trace-util.c | 10 + 5 files changed, 962 insertions(+) create mode 100644 lib/trace-cmd/trace-compress.c