X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fwrite.c;h=6663564585c299e9dcec970d42d3dc4fd5c6db8d;hp=b1a593f8d3f6f6888972e04713e4f2709db7a9eb;hb=6cca349b45e66a2b2b82aa5dcd269a4bf61c50db;hpb=558fbdac286438e57df64cf9c72e372bc2f3149c diff --git a/src/write.c b/src/write.c index b1a593f8..66635645 100644 --- a/src/write.c +++ b/src/write.c @@ -30,7 +30,24 @@ #include "dentry.h" #include "lookup_table.h" #include "xml.h" +#include "lzx.h" +#include "xpress.h" #include +#include +#include +#include + +#ifdef WITH_NTFS_3G +#include +#include +#include +#include +#endif + + +#ifdef HAVE_ALLOCA_H +#include +#endif /* Reopens the FILE* for a WIM read-write. */ @@ -111,6 +128,9 @@ WIMLIBAPI int wimlib_overwrite(WIMStruct *w, int write_flags) return WIMLIB_ERR_RENAME; } + if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE) + printf("Successfully renamed `%s' to `%s'\n", tmpfile, wimfile_name); + return 0; } @@ -291,11 +311,1150 @@ err: } -/* Write the file resources for the current image. */ -static int write_file_resources(WIMStruct *w) +/* Chunk table that's located at the beginning of each compressed resource in + * the WIM. (This is not the on-disk format; the on-disk format just has an + * array of offsets.) */ +struct chunk_table { + off_t file_offset; + u64 num_chunks; + u64 original_resource_size; + u64 bytes_per_chunk_entry; + u64 table_disk_size; + u64 cur_offset; + u64 *cur_offset_p; + u64 offsets[0]; +}; + +/* + * Allocates and initializes a chunk table, and reserves space for it in the + * output file. + */ +static int +begin_wim_resource_chunk_tab(const struct lookup_table_entry *lte, + FILE *out_fp, + off_t file_offset, + struct chunk_table **chunk_tab_ret) +{ + u64 size = wim_resource_size(lte); + u64 num_chunks = (size + WIM_CHUNK_SIZE - 1) / WIM_CHUNK_SIZE; + size_t alloc_size = sizeof(struct chunk_table) + num_chunks * sizeof(u64); + struct chunk_table *chunk_tab = CALLOC(1, alloc_size); + int ret; + + if (!chunk_tab) { + ERROR("Failed to allocate chunk table for %"PRIu64" byte " + "resource", size); + ret = WIMLIB_ERR_NOMEM; + goto out; + } + chunk_tab->file_offset = file_offset; + chunk_tab->num_chunks = num_chunks; + chunk_tab->original_resource_size = size; + chunk_tab->bytes_per_chunk_entry = (size >= (1ULL << 32)) ? 8 : 4; + chunk_tab->table_disk_size = chunk_tab->bytes_per_chunk_entry * + (num_chunks - 1); + chunk_tab->cur_offset = 0; + chunk_tab->cur_offset_p = chunk_tab->offsets; + + if (fwrite(chunk_tab, 1, chunk_tab->table_disk_size, out_fp) != + chunk_tab->table_disk_size) { + ERROR_WITH_ERRNO("Failed to write chunk table in compressed " + "file resource"); + ret = WIMLIB_ERR_WRITE; + goto out; + } + + ret = 0; +out: + *chunk_tab_ret = chunk_tab; + return ret; +} + +typedef int (*compress_func_t)(const void *, unsigned, void *, unsigned *); + +compress_func_t get_compress_func(int out_ctype) { - DEBUG("Writing file resources for image %u.", w->current_image); - return for_dentry_in_tree(wim_root_dentry(w), write_dentry_resources, w); + if (out_ctype == WIM_COMPRESSION_TYPE_LZX) + return lzx_compress; + else + return xpress_compress; +} + + +/* + * Compresses a chunk of a WIM resource. + * + * @chunk: Uncompressed data of the chunk. + * @chunk_size: Size of the uncompressed chunk in bytes. + * @compressed_chunk: Pointer to output buffer of size at least + * (@chunk_size - 1) bytes. + * @compressed_chunk_len_ret: Pointer to an unsigned int into which the size + * of the compressed chunk will be + * returned. + * @ctype: Type of compression to use. Must be WIM_COMPRESSION_TYPE_LZX + * or WIM_COMPRESSION_TYPE_XPRESS. + * + * Returns zero if compressed succeeded, and nonzero if the chunk could not be + * compressed to any smaller than @chunk_size. This function cannot fail for + * any other reasons. + */ +static int compress_chunk(const u8 chunk[], unsigned chunk_size, + u8 compressed_chunk[], + unsigned *compressed_chunk_len_ret, + int ctype) +{ + compress_func_t compress = get_compress_func(ctype); + return (*compress)(chunk, chunk_size, compressed_chunk, + compressed_chunk_len_ret); +} + +/* + * Writes a chunk of a WIM resource to an output file. + * + * @chunk: Uncompressed data of the chunk. + * @chunk_size: Size of the chunk (<= WIM_CHUNK_SIZE) + * @out_fp: FILE * to write tho chunk to. + * @out_ctype: Compression type to use when writing the chunk (ignored if no + * chunk table provided) + * @chunk_tab: Pointer to chunk table being created. It is updated with the + * offset of the chunk we write. + * + * Returns 0 on success; nonzero on failure. + */ +static int write_wim_resource_chunk(const u8 chunk[], unsigned chunk_size, + FILE *out_fp, int out_ctype, + struct chunk_table *chunk_tab) +{ + const u8 *out_chunk; + unsigned out_chunk_size; + + wimlib_assert(chunk_size <= WIM_CHUNK_SIZE); + + if (!chunk_tab) { + out_chunk = chunk; + out_chunk_size = chunk_size; + } else { + u8 *compressed_chunk = alloca(chunk_size); + int ret; + + ret = compress_chunk(chunk, chunk_size, compressed_chunk, + &out_chunk_size, out_ctype); + if (ret == 0) { + out_chunk = compressed_chunk; + } else { + out_chunk = chunk; + out_chunk_size = chunk_size; + } + *chunk_tab->cur_offset_p++ = chunk_tab->cur_offset; + chunk_tab->cur_offset += out_chunk_size; + } + + if (fwrite(out_chunk, 1, out_chunk_size, out_fp) != out_chunk_size) { + ERROR_WITH_ERRNO("Failed to write WIM resource chunk"); + return WIMLIB_ERR_WRITE; + } + return 0; +} + +/* + * Finishes a WIM chunk tale and writes it to the output file at the correct + * offset. + * + * The final size of the full compressed resource is returned in the + * @compressed_size_p. + */ +static int +finish_wim_resource_chunk_tab(struct chunk_table *chunk_tab, + FILE *out_fp, u64 *compressed_size_p) +{ + size_t bytes_written; + if (fseeko(out_fp, chunk_tab->file_offset, SEEK_SET) != 0) { + ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" of output " + "WIM file", chunk_tab->file_offset); + return WIMLIB_ERR_WRITE; + } + + if (chunk_tab->bytes_per_chunk_entry == 8) { + array_cpu_to_le64(chunk_tab->offsets, chunk_tab->num_chunks); + } else { + for (u64 i = 0; i < chunk_tab->num_chunks; i++) + ((u32*)chunk_tab->offsets)[i] = + cpu_to_le32(chunk_tab->offsets[i]); + } + bytes_written = fwrite((u8*)chunk_tab->offsets + + chunk_tab->bytes_per_chunk_entry, + 1, chunk_tab->table_disk_size, out_fp); + if (bytes_written != chunk_tab->table_disk_size) { + ERROR_WITH_ERRNO("Failed to write chunk table in compressed " + "file resource"); + return WIMLIB_ERR_WRITE; + } + if (fseeko(out_fp, 0, SEEK_END) != 0) { + ERROR_WITH_ERRNO("Failed to seek to end of output WIM file"); + return WIMLIB_ERR_WRITE; + } + *compressed_size_p = chunk_tab->cur_offset + chunk_tab->table_disk_size; + return 0; +} + +static int prepare_resource_for_read(struct lookup_table_entry *lte + + #ifdef WITH_NTFS_3G + , ntfs_inode **ni_ret + #endif + ) +{ + if (lte->resource_location == RESOURCE_IN_FILE_ON_DISK + && !lte->file_on_disk_fp) + { + wimlib_assert(lte->file_on_disk); + lte->file_on_disk_fp = fopen(lte->file_on_disk, "rb"); + if (!lte->file_on_disk_fp) { + ERROR_WITH_ERRNO("Failed to open the file `%s' for " + "reading", lte->file_on_disk); + return WIMLIB_ERR_OPEN; + } + } +#ifdef WITH_NTFS_3G + else if (lte->resource_location == RESOURCE_IN_NTFS_VOLUME + && !lte->attr) + { + struct ntfs_location *loc = lte->ntfs_loc; + ntfs_inode *ni; + wimlib_assert(loc); + ni = ntfs_pathname_to_inode(*loc->ntfs_vol_p, NULL, loc->path_utf8); + if (!ni) { + ERROR_WITH_ERRNO("Failed to open inode `%s' in NTFS " + "volume", loc->path_utf8); + return WIMLIB_ERR_NTFS_3G; + } + lte->attr = ntfs_attr_open(ni, + loc->is_reparse_point ? AT_REPARSE_POINT : AT_DATA, + (ntfschar*)loc->stream_name_utf16, + loc->stream_name_utf16_num_chars); + if (!lte->attr) { + ERROR_WITH_ERRNO("Failed to open attribute of `%s' in " + "NTFS volume", loc->path_utf8); + ntfs_inode_close(ni); + return WIMLIB_ERR_NTFS_3G; + } + *ni_ret = ni; + } +#endif + return 0; +} + +static void end_wim_resource_read(struct lookup_table_entry *lte + #ifdef WITH_NTFS_3G + , ntfs_inode *ni + #endif + ) +{ + if (lte->resource_location == RESOURCE_IN_FILE_ON_DISK + && lte->file_on_disk_fp) { + fclose(lte->file_on_disk_fp); + lte->file_on_disk_fp = NULL; + } +#ifdef WITH_NTFS_3G + else if (lte->resource_location == RESOURCE_IN_NTFS_VOLUME) { + if (lte->attr) { + ntfs_attr_close(lte->attr); + lte->attr = NULL; + } + if (ni) + ntfs_inode_close(ni); + } +#endif +} + +/* + * Writes a WIM resource to a FILE * opened for writing. The resource may be + * written uncompressed or compressed depending on the @out_ctype parameter. + * + * If by chance the resource compresses to more than the original size (this may + * happen with random data or files than are pre-compressed), the resource is + * instead written uncompressed (and this is reflected in the @out_res_entry by + * removing the WIM_RESHDR_FLAG_COMPRESSED flag). + * + * @lte: The lookup table entry for the WIM resource. + * @out_fp: The FILE * to write the resource to. + * @out_ctype: The compression type of the resource to write. Note: if this is + * the same as the compression type of the WIM resource we + * need to read, we simply copy the data (i.e. we do not + * uncompress it, then compress it again). + * @out_res_entry: If non-NULL, a resource entry that is filled in with the + * offset, original size, compressed size, and compression flag + * of the output resource. + * + * Returns 0 on success; nonzero on failure. + */ +int write_wim_resource(struct lookup_table_entry *lte, + FILE *out_fp, int out_ctype, + struct resource_entry *out_res_entry, + int flags) +{ + u64 bytes_remaining; + u64 original_size; + u64 old_compressed_size; + u64 new_compressed_size; + u64 offset; + int ret; + struct chunk_table *chunk_tab = NULL; + bool raw; + off_t file_offset; +#ifdef WITH_NTFS_3G + ntfs_inode *ni = NULL; +#endif + + wimlib_assert(lte); + + /* Original size of the resource */ + original_size = wim_resource_size(lte); + + /* Compressed size of the resource (as it exists now) */ + old_compressed_size = wim_resource_compressed_size(lte); + + /* Current offset in output file */ + file_offset = ftello(out_fp); + if (file_offset == -1) { + ERROR_WITH_ERRNO("Failed to get offset in output " + "stream"); + return WIMLIB_ERR_WRITE; + } + + /* Are the compression types the same? If so, do a raw copy (copy + * without decompressing and recompressing the data). */ + raw = (wim_resource_compression_type(lte) == out_ctype + && out_ctype != WIM_COMPRESSION_TYPE_NONE); + + if (raw) { + flags |= WIMLIB_RESOURCE_FLAG_RAW; + bytes_remaining = old_compressed_size; + } else { + flags &= ~WIMLIB_RESOURCE_FLAG_RAW; + bytes_remaining = original_size; + } + + /* Empty resource; nothing needs to be done, so just return success. */ + if (bytes_remaining == 0) + return 0; + + /* Buffer for reading chunks for the resource */ + u8 buf[min(WIM_CHUNK_SIZE, bytes_remaining)]; + + /* If we are writing a compressed resource and not doing a raw copy, we + * need to initialize the chunk table */ + if (out_ctype != WIM_COMPRESSION_TYPE_NONE && !raw) { + ret = begin_wim_resource_chunk_tab(lte, out_fp, file_offset, + &chunk_tab); + if (ret != 0) + goto out; + } + + /* If the WIM resource is in an external file, open a FILE * to it so we + * don't have to open a temporary one in read_wim_resource() for each + * chunk. */ +#ifdef WITH_NTFS_3G + ret = prepare_resource_for_read(lte, &ni); +#else + ret = prepare_resource_for_read(lte); +#endif + if (ret != 0) + goto out; + + /* If we aren't doing a raw copy, we will compute the SHA1 message + * digest of the resource as we read it, and verify it's the same as the + * hash given in the lookup table entry once we've finished reading the + * resource. */ + SHA_CTX ctx; + if (!raw) + sha1_init(&ctx); + + /* While there are still bytes remaining in the WIM resource, read a + * chunk of the resource, update SHA1, then write that chunk using the + * desired compression type. */ + offset = 0; + do { + u64 to_read = min(bytes_remaining, WIM_CHUNK_SIZE); + ret = read_wim_resource(lte, buf, to_read, offset, flags); + if (ret != 0) + goto out_fclose; + if (!raw) + sha1_update(&ctx, buf, to_read); + ret = write_wim_resource_chunk(buf, to_read, out_fp, + out_ctype, chunk_tab); + if (ret != 0) + goto out_fclose; + bytes_remaining -= to_read; + offset += to_read; + } while (bytes_remaining); + + /* Raw copy: The new compressed size is the same as the old compressed + * size + * + * Using WIM_COMPRESSION_TYPE_NONE: The new compressed size is the + * original size + * + * Using a different compression type: Call + * finish_wim_resource_chunk_tab() and it will provide the new + * compressed size. + */ + if (raw) { + new_compressed_size = old_compressed_size; + } else { + if (out_ctype == WIM_COMPRESSION_TYPE_NONE) + new_compressed_size = original_size; + else { + ret = finish_wim_resource_chunk_tab(chunk_tab, out_fp, + &new_compressed_size); + if (ret != 0) + goto out_fclose; + } + } + + /* Verify SHA1 message digest of the resource, unless we are doing a raw + * write (in which case we never even saw the uncompressed data). Or, + * if the hash we had before is all 0's, just re-set it to be the new + * hash. */ + if (!raw) { + u8 md[SHA1_HASH_SIZE]; + sha1_final(md, &ctx); + if (is_zero_hash(lte->hash)) { + copy_hash(lte->hash, md); + } else if (!hashes_equal(md, lte->hash)) { + ERROR("WIM resource has incorrect hash!"); + if (lte->resource_location == RESOURCE_IN_FILE_ON_DISK) { + ERROR("We were reading it from `%s'; maybe it changed " + "while we were reading it.", + lte->file_on_disk); + } + ret = WIMLIB_ERR_INVALID_RESOURCE_HASH; + goto out_fclose; + } + } + + if (!raw && new_compressed_size >= original_size && + out_ctype != WIM_COMPRESSION_TYPE_NONE) + { + /* Oops! We compressed the resource to larger than the original + * size. Write the resource uncompressed instead. */ + if (fseeko(out_fp, file_offset, SEEK_SET) != 0) { + ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" " + "of output WIM file", file_offset); + ret = WIMLIB_ERR_WRITE; + goto out_fclose; + } + ret = write_wim_resource(lte, out_fp, WIM_COMPRESSION_TYPE_NONE, + out_res_entry, flags); + if (ret != 0) + goto out_fclose; + if (fflush(out_fp) != 0) { + ERROR_WITH_ERRNO("Failed to flush output WIM file"); + ret = WIMLIB_ERR_WRITE; + goto out_fclose; + } + if (ftruncate(fileno(out_fp), file_offset + out_res_entry->size) != 0) { + ERROR_WITH_ERRNO("Failed to truncate output WIM file"); + ret = WIMLIB_ERR_WRITE; + goto out_fclose; + } + } else { + if (out_res_entry) { + out_res_entry->size = new_compressed_size; + out_res_entry->original_size = original_size; + out_res_entry->offset = file_offset; + out_res_entry->flags = lte->resource_entry.flags + & ~WIM_RESHDR_FLAG_COMPRESSED; + if (out_ctype != WIM_COMPRESSION_TYPE_NONE) + out_res_entry->flags |= WIM_RESHDR_FLAG_COMPRESSED; + } + } + ret = 0; +out_fclose: +#ifdef WITH_NTFS_3G + end_wim_resource_read(lte, ni); +#else + end_wim_resource_read(lte); +#endif +out: + FREE(chunk_tab); + return ret; +} + + +struct shared_queue { + sem_t filled_slots; + sem_t empty_slots; + pthread_mutex_t lock; + unsigned front; + unsigned back; + void **array; + unsigned size; +}; + +static int shared_queue_init(struct shared_queue *q, unsigned size) +{ + q->array = CALLOC(sizeof(q->array[0]), size); + if (!q->array) + return WIMLIB_ERR_NOMEM; + + sem_init(&q->filled_slots, 0, 0); + sem_init(&q->empty_slots, 0, size); + pthread_mutex_init(&q->lock, NULL); + q->front = 0; + q->back = size - 1; + q->size = size; + return 0; +} + +static void shared_queue_destroy(struct shared_queue *q) +{ + sem_destroy(&q->filled_slots); + sem_destroy(&q->empty_slots); + pthread_mutex_destroy(&q->lock); + FREE(q->array); +} + +static void shared_queue_put(struct shared_queue *q, void *obj) +{ + sem_wait(&q->empty_slots); + pthread_mutex_lock(&q->lock); + + q->back = (q->back + 1) % q->size; + q->array[q->back] = obj; + + sem_post(&q->filled_slots); + pthread_mutex_unlock(&q->lock); +} + +static void *shared_queue_get(struct shared_queue *q) +{ + sem_wait(&q->filled_slots); + pthread_mutex_lock(&q->lock); + + void *obj = q->array[q->front]; + q->array[q->front] = NULL; + q->front = (q->front + 1) % q->size; + + sem_post(&q->empty_slots); + pthread_mutex_unlock(&q->lock); + return obj; +} + +static inline int shared_queue_get_filled(struct shared_queue *q) +{ + int sval; + sem_getvalue(&q->filled_slots, &sval); + return sval; +} + +struct compressor_thread_params { + struct shared_queue *res_to_compress_queue; + struct shared_queue *compressed_res_queue; + compress_func_t compress; +}; + +#define MAX_CHUNKS_PER_MSG 2 + +struct message { + struct lookup_table_entry *lte; + u8 *uncompressed_chunks[MAX_CHUNKS_PER_MSG]; + u8 *out_compressed_chunks[MAX_CHUNKS_PER_MSG]; + u8 *compressed_chunks[MAX_CHUNKS_PER_MSG]; + unsigned uncompressed_chunk_sizes[MAX_CHUNKS_PER_MSG]; + unsigned compressed_chunk_sizes[MAX_CHUNKS_PER_MSG]; + unsigned num_chunks; + struct list_head list; + bool complete; + u64 begin_chunk; +}; + +static void compress_chunks(struct message *msg, compress_func_t compress) +{ + for (unsigned i = 0; i < msg->num_chunks; i++) { + DEBUG2("compress chunk %u of %u", i, msg->num_chunks); + int ret = compress(msg->uncompressed_chunks[i], + msg->uncompressed_chunk_sizes[i], + msg->compressed_chunks[i], + &msg->compressed_chunk_sizes[i]); + if (ret == 0) { + msg->out_compressed_chunks[i] = msg->compressed_chunks[i]; + } else { + msg->out_compressed_chunks[i] = msg->uncompressed_chunks[i]; + msg->compressed_chunk_sizes[i] = msg->uncompressed_chunk_sizes[i]; + } + } +} + +static void *compressor_thread_proc(void *arg) +{ + struct compressor_thread_params *params = arg; + struct shared_queue *res_to_compress_queue = params->res_to_compress_queue; + struct shared_queue *compressed_res_queue = params->compressed_res_queue; + compress_func_t compress = params->compress; + struct message *msg; + + DEBUG("Compressor thread ready"); + while ((msg = shared_queue_get(res_to_compress_queue)) != NULL) { + compress_chunks(msg, compress); + shared_queue_put(compressed_res_queue, msg); + } + DEBUG("Compressor thread terminating"); +} + +static int write_stream_list_serial(struct list_head *stream_list, + FILE *out_fp, int out_ctype, + int write_flags) +{ + struct lookup_table_entry *lte; + int ret; + + list_for_each_entry(lte, stream_list, staging_list) { + ret = write_wim_resource(lte, out_fp, out_ctype, + <e->output_resource_entry, 0); + if (ret != 0) + return ret; + } + return 0; +} + +static int write_wim_chunks(struct message *msg, FILE *out_fp, + struct chunk_table *chunk_tab) +{ + for (unsigned i = 0; i < msg->num_chunks; i++) { + unsigned chunk_csize = msg->compressed_chunk_sizes[i]; + + DEBUG2("Write wim chunk %u of %u (csize = %u)", + i, msg->num_chunks, chunk_csize); + + if (fwrite(msg->out_compressed_chunks[i], 1, chunk_csize, out_fp) + != chunk_csize) + { + ERROR_WITH_ERRNO("Failed to write WIM"); + return WIMLIB_ERR_WRITE; + } + + *chunk_tab->cur_offset_p++ = chunk_tab->cur_offset; + chunk_tab->cur_offset += chunk_csize; + } + return 0; +} + +static int main_writer_thread_proc(struct list_head *stream_list, + FILE *out_fp, + int out_ctype, + struct shared_queue *res_to_compress_queue, + struct shared_queue *compressed_res_queue, + size_t queue_size) +{ + int ret; + + + struct message msgs[queue_size]; + ZERO_ARRAY(msgs); + + LIST_HEAD(available_msgs); + + for (size_t i = 0; i < ARRAY_LEN(msgs); i++) + list_add(&msgs[i].list, &available_msgs); + + + struct list_head *next_resource = stream_list->next; + struct lookup_table_entry *next_lte = container_of(next_resource, + struct lookup_table_entry, + staging_list); + next_resource = next_resource->next; + u64 next_chunk = 0; + u64 next_num_chunks = wim_resource_chunks(next_lte); + INIT_LIST_HEAD(&next_lte->msg_list); + SHA_CTX next_sha_ctx; + sha1_init(&next_sha_ctx); + + u8 next_hash[SHA1_HASH_SIZE]; + + // Resources owning chunks that have been sent off for compression + LIST_HEAD(outstanding_resources); + + // Resources that are going to be written by the main thread + LIST_HEAD(my_resources); + + list_add_tail(&next_lte->staging_list, &outstanding_resources); + + struct lookup_table_entry *cur_lte = next_lte; + struct chunk_table *cur_chunk_tab = NULL; + struct lookup_table_entry *lte; + struct message *msg; + +#ifdef WITH_NTFS_3G + ntfs_inode *ni = NULL; +#endif + +#ifdef WITH_NTFS_3G + ret = prepare_resource_for_read(next_lte, &ni); +#else + ret = prepare_resource_for_read(next_lte); +#endif + + DEBUG("Initializing buffers for uncompressed " + "and compressed data (%zu bytes needed)", + queue_size * MAX_CHUNKS_PER_MSG * WIM_CHUNK_SIZE * 2); + + for (size_t i = 0; i < ARRAY_LEN(msgs); i++) { + for (size_t j = 0; j < MAX_CHUNKS_PER_MSG; j++) { + msgs[i].compressed_chunks[j] = MALLOC(WIM_CHUNK_SIZE); + msgs[i].uncompressed_chunks[j] = MALLOC(WIM_CHUNK_SIZE); + if (msgs[i].compressed_chunks[j] == NULL || + msgs[i].uncompressed_chunks[j] == NULL) + { + ERROR("Could not allocate enough memory for " + "multi-threaded compression"); + ret = WIMLIB_ERR_NOMEM; + goto out; + } + } + } + + while (1) { + // Send chunks to the compressor threads until either (a) there + // are no more messages available since they were all sent off, + // or (b) there are no more resources that need to be + // compressed. + while (!list_empty(&available_msgs) && next_lte != NULL) { + + wimlib_assert(next_chunk < next_num_chunks); + + // Get a message from the available messages + // list + msg = container_of(available_msgs.next, + struct message, + list); + + // ... and delete it from the available messages + // list + list_del(&msg->list); + + // Initialize the message with the chunks to + // compress. + msg->num_chunks = min(next_num_chunks - next_chunk, + MAX_CHUNKS_PER_MSG); + msg->lte = next_lte; + msg->complete = false; + msg->begin_chunk = next_chunk; + + unsigned size = WIM_CHUNK_SIZE; + for (unsigned i = 0; i < msg->num_chunks; i++) { + if (next_chunk == next_num_chunks - 1 && + wim_resource_size(next_lte) % WIM_CHUNK_SIZE != 0) + { + size = wim_resource_size(next_lte) % WIM_CHUNK_SIZE; + } + + DEBUG2("Read resource (size=%u, offset=%zu)", + size, next_chunk * WIM_CHUNK_SIZE); + + msg->uncompressed_chunk_sizes[i] = size; + + ret = read_wim_resource(next_lte, + msg->uncompressed_chunks[i], + size, + next_chunk * WIM_CHUNK_SIZE, + 0); + if (ret != 0) + goto out; + sha1_update(&next_sha_ctx, + msg->uncompressed_chunks[i], size); + next_chunk++; + } + + // Send the compression request + list_add_tail(&msg->list, &next_lte->msg_list); + shared_queue_put(res_to_compress_queue, msg); + DEBUG2("Compression request sent"); + + if (next_chunk != next_num_chunks) + // More chunks to send for this resource + continue; + + // Done sending compression requests for a resource! + // Check the SHA1 message digest. + DEBUG2("Finalize SHA1 md (next_num_chunks=%zu)", next_num_chunks); + sha1_final(next_hash, &next_sha_ctx); + if (!hashes_equal(next_lte->hash, next_hash)) { + ERROR("WIM resource has incorrect hash!"); + if (next_lte->resource_location == RESOURCE_IN_FILE_ON_DISK) { + ERROR("We were reading it from `%s'; maybe it changed " + "while we were reading it.", + next_lte->file_on_disk); + } + ret = WIMLIB_ERR_INVALID_RESOURCE_HASH; + goto out; + } + + // Advance to the next resource. + // + // If the next resource needs no compression, + // just write it with this thread (not now + // though--- we could be in the middle of + // writing another resource.) Keep doing this + // until we either get to the end of the + // resources list, or we get to a resource that + // needs compression. + + while (1) { + if (next_resource == stream_list) { + next_lte = NULL; + break; + } + #ifdef WITH_NTFS_3G + end_wim_resource_read(next_lte, ni); + ni = NULL; + #else + end_wim_resource_read(next_lte); + #endif + + next_lte = container_of(next_resource, + struct lookup_table_entry, + staging_list); + next_resource = next_resource->next; + if ((next_lte->resource_location == RESOURCE_IN_WIM + && wimlib_get_compression_type(next_lte->wim) == out_ctype) + || wim_resource_size(next_lte) == 0) + { + list_add_tail(&next_lte->staging_list, + &my_resources); + } else { + list_add_tail(&next_lte->staging_list, + &outstanding_resources); + next_chunk = 0; + next_num_chunks = wim_resource_chunks(next_lte); + sha1_init(&next_sha_ctx); + INIT_LIST_HEAD(&next_lte->msg_list); + #ifdef WITH_NTFS_3G + ret = prepare_resource_for_read(next_lte, &ni); + #else + ret = prepare_resource_for_read(next_lte); + #endif + if (ret != 0) + goto out; + DEBUG2("Updated next_lte"); + break; + } + } + } + + // If there are no outstanding resources, there are no more + // resources to compress. + if (list_empty(&outstanding_resources)) { + DEBUG("No outstanding resources! Done"); + ret = 0; + goto out; + } + + // Get the next message from the queue and process it. + // The message will contain 1 or more data chunks that have been + // compressed. + DEBUG2("Waiting for message"); + msg = shared_queue_get(compressed_res_queue); + msg->complete = true; + + DEBUG2("Received msg (begin_chunk=%"PRIu64")", msg->begin_chunk); + + list_for_each_entry(msg, &cur_lte->msg_list, list) { + DEBUG2("complete=%d", msg->complete); + } + + // Is this the next chunk in the current resource? If it's not + // (i.e., an earlier chunk in a same or different resource + // hasn't been compressed yet), do nothing, and keep this + // message around until all earlier chunks are received. + // + // Otherwise, write all the chunks we can. + while (!list_empty(&cur_lte->msg_list) + && (msg = container_of(cur_lte->msg_list.next, + struct message, + list))->complete) + { + DEBUG2("Complete msg (begin_chunk=%"PRIu64")", msg->begin_chunk); + if (msg->begin_chunk == 0) { + DEBUG2("Begin chunk tab"); + // This is the first set of chunks. + // Leave space for the chunk table in + // the output file. + off_t cur_offset = ftello(out_fp); + if (cur_offset == -1) { + ret = WIMLIB_ERR_WRITE; + goto out; + } + FREE(cur_chunk_tab); + cur_chunk_tab = NULL; + ret = begin_wim_resource_chunk_tab(cur_lte, + out_fp, + cur_offset, + &cur_chunk_tab); + if (ret != 0) + goto out; + } + ret = write_wim_chunks(msg, out_fp, cur_chunk_tab); + if (ret != 0) + goto out; + + list_del(&msg->list); + list_add(&msg->list, &available_msgs); + + if (list_empty(&cur_lte->msg_list) && + msg->begin_chunk + msg->num_chunks == cur_chunk_tab->num_chunks) + { + DEBUG2("Finish wim chunk tab"); + u64 res_csize; + ret = finish_wim_resource_chunk_tab(cur_chunk_tab, + out_fp, + &res_csize); + if (ret != 0) + return ret; + + cur_lte->output_resource_entry.size = + res_csize; + + cur_lte->output_resource_entry.original_size = + cur_lte->resource_entry.original_size; + + cur_lte->output_resource_entry.offset = + cur_chunk_tab->file_offset; + + cur_lte->output_resource_entry.flags = + cur_lte->resource_entry.flags | + WIM_RESHDR_FLAG_COMPRESSED; + + struct list_head *next = cur_lte->staging_list.next; + list_del(&cur_lte->staging_list); + + if (next == &outstanding_resources) { + DEBUG("No more outstanding resources"); + ret = 0; + goto out; + } else { + cur_lte = container_of(cur_lte->staging_list.next, + struct lookup_table_entry, + staging_list); + } + + struct lookup_table_entry *tmp; + list_for_each_entry_safe(lte, + tmp, + &my_resources, + staging_list) + { + ret = write_wim_resource(lte, + out_fp, + out_ctype, + <e->output_resource_entry, + 0); + list_del(<e->staging_list); + if (ret != 0) + goto out; + } + } + } + } + +out: +#ifdef WITH_NTFS_3G + end_wim_resource_read(cur_lte, ni); +#else + end_wim_resource_read(cur_lte); +#endif + if (ret == 0) { + list_for_each_entry(lte, &my_resources, staging_list) { + ret = write_wim_resource(lte, out_fp, + out_ctype, + <e->output_resource_entry, + 0); + if (ret != 0) + break; + } + } else { + size_t num_available_msgs = 0; + struct list_head *cur; + + list_for_each(cur, &available_msgs) { + num_available_msgs++; + } + + while (num_available_msgs < ARRAY_LEN(msgs)) { + msg = shared_queue_get(compressed_res_queue); + num_available_msgs++; + } + } + + DEBUG("Freeing messages"); + + for (size_t i = 0; i < ARRAY_LEN(msgs); i++) { + for (size_t j = 0; j < MAX_CHUNKS_PER_MSG; j++) { + FREE(msgs[i].compressed_chunks[j]); + FREE(msgs[i].uncompressed_chunks[j]); + } + } + + if (cur_chunk_tab != NULL) + FREE(cur_chunk_tab); + return ret; +} + +static int write_stream_list_parallel(struct list_head *stream_list, + FILE *out_fp, int out_ctype, + int write_flags) +{ + int ret; + long nthreads; + struct shared_queue res_to_compress_queue; + struct shared_queue compressed_res_queue; + + nthreads = sysconf(_SC_NPROCESSORS_ONLN); + if (nthreads < 1) { + WARNING("Could not determine number of processors! Assuming 1"); + goto out_serial; + } + + wimlib_assert(stream_list->next != stream_list); + + { + pthread_t compressor_threads[nthreads]; + + static const double MESSAGES_PER_THREAD = 2.0; + size_t queue_size = (size_t)(nthreads * MESSAGES_PER_THREAD); + + DEBUG("Initializing shared queues (queue_size=%zu)", queue_size); + + ret = shared_queue_init(&res_to_compress_queue, queue_size); + if (ret != 0) + goto out_serial; + + ret = shared_queue_init(&compressed_res_queue, queue_size); + if (ret != 0) + goto out_destroy_res_to_compress_queue; + + + struct compressor_thread_params params; + params.res_to_compress_queue = &res_to_compress_queue; + params.compressed_res_queue = &compressed_res_queue; + params.compress = get_compress_func(out_ctype); + + for (long i = 0; i < nthreads; i++) { + DEBUG("pthread_create thread %ld", i); + ret = pthread_create(&compressor_threads[i], NULL, + compressor_thread_proc, ¶ms); + if (ret != 0) { + ERROR_WITH_ERRNO("Failed to create compressor " + "thread %ld", i); + nthreads = i; + goto out_join; + } + } + + if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE) { + printf("Writing compressed data using %ld threads...\n", + nthreads); + } + + ret = main_writer_thread_proc(stream_list, + out_fp, + out_ctype, + &res_to_compress_queue, + &compressed_res_queue, + queue_size); + + out_join: + for (long i = 0; i < nthreads; i++) + shared_queue_put(&res_to_compress_queue, NULL); + + for (long i = 0; i < nthreads; i++) { + if (pthread_join(compressor_threads[i], NULL)) { + WARNING("Failed to join compressor thread %ld: %s", + i, strerror(errno)); + } + } + } + shared_queue_destroy(&compressed_res_queue); +out_destroy_res_to_compress_queue: + shared_queue_destroy(&res_to_compress_queue); + if (ret >= 0 && ret != WIMLIB_ERR_NOMEM) + return ret; +out_serial: + WARNING("Falling back to single-threaded compression"); + return write_stream_list_serial(stream_list, out_fp, + out_ctype, write_flags); +} + +static int write_stream_list(struct list_head *stream_list, FILE *out_fp, + int out_ctype, int write_flags) +{ + struct lookup_table_entry *lte; + size_t num_streams = 0; + u64 total_size = 0; + bool compression_needed = false; + + list_for_each_entry(lte, stream_list, staging_list) { + num_streams++; + total_size += wim_resource_size(lte); + if (!compression_needed + && out_ctype != WIM_COMPRESSION_TYPE_NONE + && (lte->resource_location != RESOURCE_IN_WIM + || wimlib_get_compression_type(lte->wim) != out_ctype) + && wim_resource_size(lte) != 0) + compression_needed = true; + } + + if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE) { + printf("Preparing to write %zu streams " + "(%"PRIu64" total bytes uncompressed)\n", + num_streams, total_size); + printf("Using compression type %s\n", + wimlib_get_compression_type_string(out_ctype)); + } + + if (compression_needed && total_size >= 0) { // XXX + return write_stream_list_parallel(stream_list, out_fp, + out_ctype, write_flags); + } else { + if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE) { + puts("Using 1 thread (no compression needed)"); + } + + return write_stream_list_serial(stream_list, out_fp, + out_ctype, write_flags); + } +} + + +static int dentry_find_streams_to_write(struct dentry *dentry, + void *wim) +{ + WIMStruct *w = wim; + struct list_head *stream_list = w->private; + struct lookup_table_entry *lte; + for (unsigned i = 0; i <= dentry->d_inode->num_ads; i++) { + lte = inode_stream_lte(dentry->d_inode, i, w->lookup_table); + if (lte && ++lte->out_refcnt == 1) + list_add(<e->staging_list, stream_list); + } + return 0; +} + +static int find_streams_to_write(WIMStruct *w) +{ + return for_dentry_in_tree(wim_root_dentry(w), + dentry_find_streams_to_write, w); +} + +static int write_wim_streams(WIMStruct *w, int image, int write_flags) +{ + + LIST_HEAD(stream_list); + + w->private = &stream_list; + for_image(w, image, find_streams_to_write); + return write_stream_list(&stream_list, w->out_fp, + wimlib_get_compression_type(w), write_flags); } /* @@ -490,11 +1649,10 @@ WIMLIBAPI int wimlib_write(WIMStruct *w, const char *path, for_lookup_table_entry(w->lookup_table, lte_zero_out_refcnt, NULL); - w->write_flags = write_flags; + ret = write_wim_streams(w, image, write_flags); - ret = for_image(w, image, write_file_resources); if (ret != 0) { - ERROR("Failed to write WIM file resources to `%s'", path); + /*ERROR("Failed to write WIM file resources to `%s'", path);*/ return ret; } @@ -505,5 +1663,11 @@ WIMLIBAPI int wimlib_write(WIMStruct *w, const char *path, return ret; } - return finish_write(w, image, write_flags); + ret = finish_write(w, image, write_flags); + if (ret != 0) + return ret; + + if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE) + printf("Successfully wrote `%s'\n", path); + return 0; }