X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fwrite.c;h=c63f0f706dae9f3ad63cc7a927f8721b77587449;hp=e4a0f3ad45712c6ce8ab5a5da345b9aeed0c0bf8;hb=5944d11442d5df847c3393951a8563412d16e640;hpb=b348831df3fcf7d8eb66d35e4d0cf8434e788473 diff --git a/src/write.c b/src/write.c index e4a0f3ad..c63f0f70 100644 --- a/src/write.c +++ b/src/write.c @@ -68,6 +68,53 @@ # include /* for `struct iovec' */ #endif +/* Return true if the specified resource is compressed and the compressed data + * can be reused with the specified output parameters. */ +static bool +can_raw_copy(const struct wim_lookup_table_entry *lte, + int write_resource_flags, int out_ctype, u32 out_chunk_size) +{ + return (out_ctype == wim_resource_compression_type(lte) + && out_chunk_size == wim_resource_chunk_size(lte) + && out_ctype != WIMLIB_COMPRESSION_TYPE_NONE); +} + + +/* Return true if the specified resource must be recompressed when the specified + * output parameters are used. */ +static bool +must_compress_stream(const struct wim_lookup_table_entry *lte, + int write_resource_flags, int out_ctype, u32 out_chunk_size) +{ + return (out_ctype != WIMLIB_COMPRESSION_TYPE_NONE + && ((write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS) + || !can_raw_copy(lte, write_resource_flags, + out_ctype, out_chunk_size))); +} + +static unsigned +compress_chunk(const void * uncompressed_data, + unsigned uncompressed_len, + void *compressed_data, + int out_ctype, + struct wimlib_lzx_context *comp_ctx) +{ + switch (out_ctype) { + case WIMLIB_COMPRESSION_TYPE_XPRESS: + return wimlib_xpress_compress(uncompressed_data, + uncompressed_len, + compressed_data); + case WIMLIB_COMPRESSION_TYPE_LZX: + return wimlib_lzx_compress2(uncompressed_data, + uncompressed_len, + compressed_data, + comp_ctx); + default: + wimlib_assert(0); + return 0; + } +} + /* 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.) */ @@ -92,6 +139,7 @@ struct chunk_table { static int begin_wim_resource_chunk_tab(const struct wim_lookup_table_entry *lte, struct filedes *out_fd, + u32 out_chunk_size, struct chunk_table **chunk_tab_ret, int resource_flags) { @@ -103,7 +151,7 @@ begin_wim_resource_chunk_tab(const struct wim_lookup_table_entry *lte, int ret; size = wim_resource_size(lte); - num_chunks = wim_resource_chunks(lte); + num_chunks = DIV_ROUND_UP(size, out_chunk_size); bytes_per_chunk_entry = (size > (1ULL << 32)) ? 8 : 4; alloc_size = sizeof(struct chunk_table) + num_chunks * sizeof(u64); chunk_tab = CALLOC(1, alloc_size); @@ -158,41 +206,6 @@ chunk_tab_record_chunk(struct chunk_table *chunk_tab, unsigned out_chunk_size) } } -/* - * compress_func_t- Pointer to a function to compresses a chunk - * of a WIM resource. This may be either - * wimlib_xpress_compress() (xpress-compress.c) or - * wimlib_lzx_compress() (lzx-compress.c). - * - * @chunk: Uncompressed data of the chunk. - * @chunk_size: Size of the uncompressed chunk, in bytes. - * @out: Pointer to output buffer of size at least (@chunk_size - 1) bytes. - * - * Returns the size of the compressed data written to @out in bytes, or 0 if the - * data could not be compressed to (@chunk_size - 1) bytes or fewer. - * - * As a special requirement, the compression code is optimized for the WIM - * format and therefore requires (@chunk_size <= 32768). - * - * As another special requirement, the compression code will read up to 8 bytes - * off the end of the @chunk array for performance reasons. The values of these - * bytes will not affect the output of the compression, but the calling code - * must make sure that the buffer holding the uncompressed chunk is actually at - * least (@chunk_size + 8) bytes, or at least that these extra bytes are in - * mapped memory that will not cause a memory access violation if accessed. - */ -typedef unsigned (*compress_func_t)(const void *chunk, unsigned chunk_size, - void *out); - -static compress_func_t -get_compress_func(int out_ctype) -{ - if (out_ctype == WIMLIB_COMPRESSION_TYPE_LZX) - return wimlib_lzx_compress; - else - return wimlib_xpress_compress; -} - /* Finishes a WIM chunk table and writes it to the output file at the correct * offset. */ static int @@ -209,16 +222,14 @@ finish_wim_resource_chunk_tab(struct chunk_table *chunk_tab, chunk_tab->bytes_per_chunk_entry, chunk_tab->table_disk_size); } else { - ret = full_pwrite(out_fd, - chunk_tab->offsets + - chunk_tab->bytes_per_chunk_entry, - chunk_tab->table_disk_size, - res_start_offset); - } - if (ret) { - ERROR_WITH_ERRNO("Failed to write chunk table in compressed " - "file resource"); + ret = full_pwrite(out_fd, + chunk_tab->offsets + + chunk_tab->bytes_per_chunk_entry, + chunk_tab->table_disk_size, + res_start_offset); } + if (ret) + ERROR_WITH_ERRNO("Write error"); return ret; } @@ -284,7 +295,9 @@ finalize_and_check_sha1(SHA_CTX *sha_ctx, struct wim_lookup_table_entry *lte) } struct write_resource_ctx { - compress_func_t compress; + int out_ctype; + u32 out_chunk_size; + struct wimlib_lzx_context *comp_ctx; struct chunk_table *chunk_tab; struct filedes *out_fd; SHA_CTX sha_ctx; @@ -299,21 +312,32 @@ write_resource_cb(const void *chunk, size_t chunk_size, void *_ctx) const void *out_chunk; unsigned out_chunk_size; int ret; + void *compressed_chunk = NULL; + unsigned compressed_size; + bool compressed_chunk_malloced = false; + size_t stack_max = 32768; if (ctx->doing_sha) sha1_update(&ctx->sha_ctx, chunk, chunk_size); out_chunk = chunk; out_chunk_size = chunk_size; - if (ctx->compress) { - void *compressed_chunk; - unsigned compressed_size; + if (ctx->out_ctype != WIMLIB_COMPRESSION_TYPE_NONE) { /* Compress the chunk. */ - compressed_chunk = alloca(chunk_size); - compressed_size = (*ctx->compress)(chunk, chunk_size, - compressed_chunk); + if (chunk_size <= stack_max) { + compressed_chunk = alloca(chunk_size); + } else { + compressed_chunk = MALLOC(chunk_size); + if (compressed_chunk == NULL) + return WIMLIB_ERR_NOMEM; + compressed_chunk_malloced = true; + } + compressed_size = compress_chunk(chunk, chunk_size, + compressed_chunk, + ctx->out_ctype, + ctx->comp_ctx); /* Use compressed data if compression to less than input size * was successful. */ if (compressed_size) { @@ -344,11 +368,15 @@ write_resource_cb(const void *chunk, size_t chunk_size, void *_ctx) ret = full_write(ctx->out_fd, out_chunk, out_chunk_size); if (ret) goto error; - return 0; + +out_free_memory: + if (compressed_chunk_malloced) + FREE(compressed_chunk); + return ret; error: ERROR_WITH_ERRNO("Failed to write WIM resource chunk"); - return ret; + goto out_free_memory; } /* @@ -367,30 +395,40 @@ error: * One of the WIMLIB_COMPRESSION_TYPE_* constants to indicate which * compression algorithm to use. * + * @out_chunk_size: + * Compressed chunk size to use. + * * @out_res_entry: * On success, this is filled in with the offset, flags, compressed size, * and uncompressed size of the resource in the output WIM. * - * @write_resource_flags: + * @resource_flags: * * WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS to force data to be recompressed even * if it could otherwise be copied directly from the input; * * WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE if writing a resource for a pipable WIM * (and the output file descriptor may be a pipe). * + * @comp_ctx: + * Location of LZX compression context pointer, which will be allocated or + * updated if needed. (Initialize to NULL.) + * * Additional notes: The SHA1 message digest of the uncompressed data is * calculated (except when doing a raw copy --- see below). If the @unhashed * flag is set on the lookup table entry, this message digest is simply copied * to it; otherwise, the message digest is compared with the existing one, and - * the function will fail if they do not match. + * this function will fail if they do not match. */ -int +static int write_wim_resource(struct wim_lookup_table_entry *lte, struct filedes *out_fd, int out_ctype, + u32 out_chunk_size, struct resource_entry *out_res_entry, - int resource_flags) + int resource_flags, + struct wimlib_lzx_context **comp_ctx) { struct write_resource_ctx write_ctx; off_t res_start_offset; + u32 in_chunk_size; u64 read_size; int ret; @@ -402,45 +440,55 @@ write_wim_resource(struct wim_lookup_table_entry *lte, res_start_offset = out_fd->offset; /* If we are not forcing the data to be recompressed, and the input - * resource is located in a WIM with the same compression type as that - * desired other than no compression, we can simply copy the compressed - * data without recompressing it. This also means we must skip - * calculating the SHA1, as we never will see the uncompressed data. */ - if (lte->resource_location == RESOURCE_IN_WIM && - out_ctype == wim_resource_compression_type(lte) && - out_ctype != WIMLIB_COMPRESSION_TYPE_NONE && - !(resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS)) - { - /* Normally we can request a RAW_FULL read, but if we're reading - * from a pipable resource and writing a non-pipable resource or - * vice versa, then a RAW_CHUNKS read needs to be requested so - * that the written resource can be appropriately formatted. - * However, in neither case is any actual decompression needed. - */ + * resource is located in a WIM with a compression mode compatible with + * the output, we can simply copy the compressed data without + * recompressing it. This also means we must skip calculating the SHA1, + * as we never will see the uncompressed data. */ + if (can_raw_copy(lte, resource_flags, out_ctype, out_chunk_size)) { + /* Normally, for raw copies we can request a RAW_FULL read, but + * if we're reading from a pipable resource and writing a + * non-pipable resource or vice versa, then a RAW_CHUNKS read + * needs to be requested so that the written resource can be + * appropriately formatted. However, in neither case is any + * actual decompression needed. */ if (lte->is_pipable == !!(resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE)) + { resource_flags |= WIMLIB_READ_RESOURCE_FLAG_RAW_FULL; - else + read_size = lte->resource_entry.size; + } else { resource_flags |= WIMLIB_READ_RESOURCE_FLAG_RAW_CHUNKS; + read_size = lte->resource_entry.original_size; + } write_ctx.doing_sha = false; - read_size = lte->resource_entry.size; } else { write_ctx.doing_sha = true; sha1_init(&write_ctx.sha_ctx); read_size = lte->resource_entry.original_size; } - /* If the output resource is to be compressed, initialize the chunk - * table and set the function to use for chunk compression. Exceptions: - * no compression function is needed if doing a raw copy; also, no chunk - * table is needed if doing a *full* (not per-chunk) raw copy. */ - write_ctx.compress = NULL; + /* Set the output compression mode and initialize chunk table if needed. + */ + write_ctx.out_ctype = WIMLIB_COMPRESSION_TYPE_NONE; + write_ctx.out_chunk_size = out_chunk_size; write_ctx.chunk_tab = NULL; if (out_ctype != WIMLIB_COMPRESSION_TYPE_NONE) { - if (!(resource_flags & WIMLIB_READ_RESOURCE_FLAG_RAW)) - write_ctx.compress = get_compress_func(out_ctype); + wimlib_assert(out_chunk_size > 0); + if (!(resource_flags & WIMLIB_READ_RESOURCE_FLAG_RAW)) { + /* Compression needed. */ + write_ctx.out_ctype = out_ctype; + if (out_ctype == WIMLIB_COMPRESSION_TYPE_LZX) { + ret = wimlib_lzx_alloc_context(out_chunk_size, + NULL, comp_ctx); + if (ret) + goto out; + } + write_ctx.comp_ctx = *comp_ctx; + } if (!(resource_flags & WIMLIB_READ_RESOURCE_FLAG_RAW_FULL)) { + /* Chunk table needed. */ ret = begin_wim_resource_chunk_tab(lte, out_fd, + out_chunk_size, &write_ctx.chunk_tab, resource_flags); if (ret) @@ -461,12 +509,17 @@ write_wim_resource(struct wim_lookup_table_entry *lte, } /* Write the entire resource by reading the entire resource and feeding - * the data through the write_resource_cb function. */ + * the data through write_resource_cb(). */ write_ctx.out_fd = out_fd; write_ctx.resource_flags = resource_flags; try_write_again: + if (write_ctx.out_ctype == WIMLIB_COMPRESSION_TYPE_NONE) + in_chunk_size = wim_resource_chunk_size(lte); + else + in_chunk_size = out_chunk_size; ret = read_resource_prefix(lte, read_size, - write_resource_cb, &write_ctx, resource_flags); + write_resource_cb, + in_chunk_size, &write_ctx, resource_flags); if (ret) goto out_free_chunk_tab; @@ -514,12 +567,12 @@ try_write_again: goto out_free_chunk_tab; out_ctype = WIMLIB_COMPRESSION_TYPE_NONE; FREE(write_ctx.chunk_tab); - write_ctx.compress = NULL; + write_ctx.out_ctype = WIMLIB_COMPRESSION_TYPE_NONE; write_ctx.chunk_tab = NULL; write_ctx.doing_sha = false; goto try_write_again; } - if (resource_flags & (WIMLIB_READ_RESOURCE_FLAG_RAW)) { + if (resource_flags & WIMLIB_READ_RESOURCE_FLAG_RAW) { DEBUG("Copied raw compressed data " "(%"PRIu64" => %"PRIu64" bytes @ +%"PRIu64", flags=0x%02x)", out_res_entry->original_size, out_res_entry->size, @@ -543,39 +596,50 @@ out: } /* Like write_wim_resource(), but the resource is specified by a buffer of - * uncompressed data rather a lookup table entry; also writes the SHA1 hash of - * the buffer to @hash_ret. */ + * uncompressed data rather a lookup table entry. Also writes the SHA1 message + * digest of the buffer to @hash_ret if it is non-NULL. */ int write_wim_resource_from_buffer(const void *buf, size_t buf_size, int reshdr_flags, struct filedes *out_fd, int out_ctype, + u32 out_chunk_size, struct resource_entry *out_res_entry, - u8 *hash_ret, int write_resource_flags) + u8 *hash_ret, int write_resource_flags, + struct wimlib_lzx_context **comp_ctx) { - /* Set up a temporary lookup table entry to provide to - * write_wim_resource(). */ - struct wim_lookup_table_entry lte; int ret; + struct wim_lookup_table_entry *lte; - lte.resource_location = RESOURCE_IN_ATTACHED_BUFFER; - lte.attached_buffer = (void*)buf; - lte.resource_entry.original_size = buf_size; - lte.resource_entry.flags = reshdr_flags; + /* Set up a temporary lookup table entry to provide to + * write_wim_resource(). */ + + lte = new_lookup_table_entry(); + if (lte == NULL) + return WIMLIB_ERR_NOMEM; + + lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER; + lte->attached_buffer = (void*)buf; + lte->resource_entry.original_size = buf_size; + lte->resource_entry.flags = reshdr_flags; if (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE) { - sha1_buffer(buf, buf_size, lte.hash); - lte.unhashed = 0; + sha1_buffer(buf, buf_size, lte->hash); + lte->unhashed = 0; } else { - lte.unhashed = 1; + lte->unhashed = 1; } - ret = write_wim_resource(<e, out_fd, out_ctype, out_res_entry, - write_resource_flags); + ret = write_wim_resource(lte, out_fd, out_ctype, out_chunk_size, + out_res_entry, write_resource_flags, comp_ctx); if (ret) - return ret; + goto out_free_lte; if (hash_ret) - copy_hash(hash_ret, lte.hash); - return 0; + copy_hash(hash_ret, lte->hash); + ret = 0; +out_free_lte: + lte->resource_location = RESOURCE_NONEXISTENT; + free_lookup_table_entry(lte); + return ret; } @@ -671,13 +735,15 @@ shared_queue_get(struct shared_queue *q) struct compressor_thread_params { struct shared_queue *res_to_compress_queue; struct shared_queue *compressed_res_queue; - compress_func_t compress; + int out_ctype; + struct wimlib_lzx_context *comp_ctx; }; #define MAX_CHUNKS_PER_MSG 2 struct message { struct wim_lookup_table_entry *lte; + u32 out_chunk_size; u8 *uncompressed_chunks[MAX_CHUNKS_PER_MSG]; u8 *compressed_chunks[MAX_CHUNKS_PER_MSG]; unsigned uncompressed_chunk_sizes[MAX_CHUNKS_PER_MSG]; @@ -689,12 +755,18 @@ struct message { }; static void -compress_chunks(struct message *msg, compress_func_t compress) +compress_chunks(struct message *msg, int out_ctype, + struct wimlib_lzx_context *comp_ctx) { for (unsigned i = 0; i < msg->num_chunks; i++) { - unsigned len = compress(msg->uncompressed_chunks[i], - msg->uncompressed_chunk_sizes[i], - msg->compressed_chunks[i]); + unsigned len; + + len = compress_chunk(msg->uncompressed_chunks[i], + msg->uncompressed_chunk_sizes[i], + msg->compressed_chunks[i], + out_ctype, + comp_ctx); + void *out_chunk; unsigned out_len; if (len) { @@ -722,12 +794,11 @@ 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); + compress_chunks(msg, params->out_ctype, params->comp_ctx); shared_queue_put(compressed_res_queue, msg); } DEBUG("Compressor thread terminating"); @@ -791,6 +862,8 @@ do_write_streams_progress(struct write_streams_progress_data *progress_data, struct serial_write_stream_ctx { struct filedes *out_fd; int out_ctype; + u32 out_chunk_size; + struct wimlib_lzx_context **comp_ctx; int write_resource_flags; }; @@ -799,8 +872,11 @@ serial_write_stream(struct wim_lookup_table_entry *lte, void *_ctx) { struct serial_write_stream_ctx *ctx = _ctx; return write_wim_resource(lte, ctx->out_fd, - ctx->out_ctype, <e->output_resource_entry, - ctx->write_resource_flags); + ctx->out_ctype, + ctx->out_chunk_size, + <e->output_resource_entry, + ctx->write_resource_flags, + ctx->comp_ctx); } @@ -831,19 +907,29 @@ do_write_stream_list(struct list_head *stream_list, * stream in the WIM we are writing. The stream must be * checksummed to know if we need to write it or not. */ struct wim_lookup_table_entry *tmp; - u32 orig_refcnt = lte->out_refcnt; + u32 orig_out_refcnt = lte->out_refcnt; ret = hash_unhashed_stream(lte, lookup_table, &tmp); if (ret) break; if (tmp != lte) { + /* We found a duplicate stream. 'lte' was + * freed, so replace it with the duplicate. */ lte = tmp; - /* We found a duplicate stream. */ - if (orig_refcnt != tmp->out_refcnt) { - /* We have already written, or are going - * to write, the duplicate stream. So - * just skip to the next stream. */ - DEBUG("Discarding duplicate stream of length %"PRIu64, + + /* 'out_refcnt' was transferred to the + * duplicate, and we can detect if the duplicate + * stream was already referenced for writing by + * checking if its 'out_refcnt' is higher than + * that of the original stream. In such cases, + * the current stream can be discarded. We can + * also discard the current stream if it was + * previously marked as filtered (e.g. already + * present in the WIM being written). */ + if (lte->out_refcnt > orig_out_refcnt || + lte->filtered) { + DEBUG("Discarding duplicate stream of " + "length %"PRIu64, wim_resource_size(lte)); lte->no_progress = 0; stream_discarded = true; @@ -866,7 +952,7 @@ do_write_stream_list(struct list_head *stream_list, if (ret) break; /* In parallel mode, some streams are deferred for later, - * serialized processing; ignore them here. */ + * serialized processing; ignore them here. */ if (lte->deferred) continue; if (lte->unhashed) { @@ -888,13 +974,17 @@ do_write_stream_list_serial(struct list_head *stream_list, struct wim_lookup_table *lookup_table, struct filedes *out_fd, int out_ctype, + u32 out_chunk_size, + struct wimlib_lzx_context **comp_ctx, int write_resource_flags, struct write_streams_progress_data *progress_data) { struct serial_write_stream_ctx ctx = { .out_fd = out_fd, .out_ctype = out_ctype, + .out_chunk_size = out_chunk_size, .write_resource_flags = write_resource_flags, + .comp_ctx = comp_ctx, }; return do_write_stream_list(stream_list, lookup_table, @@ -920,6 +1010,8 @@ write_stream_list_serial(struct list_head *stream_list, struct wim_lookup_table *lookup_table, struct filedes *out_fd, int out_ctype, + u32 out_chunk_size, + struct wimlib_lzx_context **comp_ctx, int write_resource_flags, struct write_streams_progress_data *progress_data) { @@ -935,6 +1027,8 @@ write_stream_list_serial(struct list_head *stream_list, lookup_table, out_fd, out_ctype, + out_chunk_size, + comp_ctx, write_resource_flags, progress_data); } @@ -974,7 +1068,7 @@ write_wim_chunks(struct message *msg, struct filedes *out_fd, } ret = full_writev(out_fd, vecs, nvecs); if (ret) - ERROR_WITH_ERRNO("Failed to write WIM chunks"); + ERROR_WITH_ERRNO("Write error"); return ret; } @@ -984,6 +1078,8 @@ struct main_writer_thread_ctx { struct filedes *out_fd; off_t res_start_offset; int out_ctype; + u32 out_chunk_size; + struct wimlib_lzx_context **comp_ctx; int write_resource_flags; struct shared_queue *res_to_compress_queue; struct shared_queue *compressed_res_queue; @@ -1006,11 +1102,12 @@ struct main_writer_thread_ctx { }; static int -init_message(struct message *msg) +init_message(struct message *msg, u32 out_chunk_size) { + msg->out_chunk_size = out_chunk_size; for (size_t i = 0; i < MAX_CHUNKS_PER_MSG; i++) { - msg->compressed_chunks[i] = MALLOC(WIM_CHUNK_SIZE); - msg->uncompressed_chunks[i] = MALLOC(WIM_CHUNK_SIZE); + msg->compressed_chunks[i] = MALLOC(out_chunk_size); + msg->uncompressed_chunks[i] = MALLOC(out_chunk_size); if (msg->compressed_chunks[i] == NULL || msg->uncompressed_chunks[i] == NULL) return WIMLIB_ERR_NOMEM; @@ -1038,15 +1135,15 @@ free_messages(struct message *msgs, size_t num_messages) } static struct message * -allocate_messages(size_t num_messages) +allocate_messages(size_t num_messages, u32 out_chunk_size) { struct message *msgs; msgs = CALLOC(num_messages, sizeof(struct message)); - if (!msgs) + if (msgs == NULL) return NULL; for (size_t i = 0; i < num_messages; i++) { - if (init_message(&msgs[i])) { + if (init_message(&msgs[i], out_chunk_size)) { free_messages(msgs, num_messages); return NULL; } @@ -1068,8 +1165,8 @@ main_writer_thread_init_ctx(struct main_writer_thread_ctx *ctx) { /* Pre-allocate all the buffers that will be needed to do the chunk * compression. */ - ctx->msgs = allocate_messages(ctx->num_messages); - if (!ctx->msgs) + ctx->msgs = allocate_messages(ctx->num_messages, ctx->out_chunk_size); + if (ctx->msgs == NULL) return WIMLIB_ERR_NOMEM; /* Initially, all the messages are available to use. */ @@ -1089,12 +1186,14 @@ main_writer_thread_init_ctx(struct main_writer_thread_ctx *ctx) INIT_LIST_HEAD(&ctx->outstanding_streams); ctx->num_outstanding_messages = 0; + /* Message currently being prepared. */ ctx->next_msg = NULL; /* Resources that don't need any chunks compressed are added to this - * list and written directly by the main thread. */ + * list and written directly by the main thread. */ INIT_LIST_HEAD(&ctx->serial_streams); + /* Pointer to chunk table for stream currently being written. */ ctx->cur_chunk_tab = NULL; return 0; @@ -1116,17 +1215,17 @@ receive_compressed_chunks(struct main_writer_thread_ctx *ctx) /* Get the next message from the queue and process it. * The message will contain 1 or more data chunks that have been - * compressed. */ + * compressed. */ msg = shared_queue_get(ctx->compressed_res_queue); msg->complete = true; --ctx->num_outstanding_messages; - /* 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. + /* 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. */ + * Otherwise, write all the chunks we can. */ while (cur_lte != NULL && !list_empty(&cur_lte->msg_list) && (msg = container_of(cur_lte->msg_list.next, @@ -1154,21 +1253,21 @@ receive_compressed_chunks(struct main_writer_thread_ctx *ctx) * it if needed. */ ret = begin_wim_resource_chunk_tab(cur_lte, ctx->out_fd, + ctx->out_chunk_size, &ctx->cur_chunk_tab, ctx->write_resource_flags); if (ret) return ret; - } - /* Write the compressed chunks from the message. */ + /* Write the compressed chunks from the message. */ ret = write_wim_chunks(msg, ctx->out_fd, ctx->cur_chunk_tab, ctx->write_resource_flags); if (ret) return ret; - /* Was this the last chunk of the stream? If so, finish - * it. */ + /* Was this the last chunk of the stream? If so, finish the + * stream by writing the chunk table. */ if (list_empty(&cur_lte->msg_list) && msg->begin_chunk + msg->num_chunks == ctx->cur_chunk_tab->num_chunks) { @@ -1204,8 +1303,10 @@ receive_compressed_chunks(struct main_writer_thread_ctx *ctx) ret = write_wim_resource(cur_lte, ctx->out_fd, WIMLIB_COMPRESSION_TYPE_NONE, + 0, &cur_lte->output_resource_entry, - ctx->write_resource_flags); + ctx->write_resource_flags, + ctx->comp_ctx); if (ret) return ret; } else { @@ -1238,19 +1339,21 @@ receive_compressed_chunks(struct main_writer_thread_ctx *ctx) * list for direct writing by the main thread (e.g. * resources that don't need to be compressed because * the desired compression type is the same as the - * previous compression type). */ + * previous compression type). */ if (!list_empty(&ctx->serial_streams)) { ret = do_write_stream_list_serial(&ctx->serial_streams, ctx->lookup_table, ctx->out_fd, ctx->out_ctype, + ctx->out_chunk_size, + ctx->comp_ctx, ctx->write_resource_flags, ctx->progress_data); if (ret) return ret; } - /* Advance to the next stream to write. */ + /* Advance to the next stream to write. */ if (list_empty(&ctx->outstanding_streams)) { cur_lte = NULL; } else { @@ -1263,7 +1366,7 @@ receive_compressed_chunks(struct main_writer_thread_ctx *ctx) return 0; } -/* Called when the main thread has read a new chunk of data. */ +/* Called when the main thread has read a new chunk of data. */ static int main_writer_thread_cb(const void *chunk, size_t chunk_size, void *_ctx) { @@ -1342,6 +1445,8 @@ main_writer_thread_finish(void *_ctx) ctx->lookup_table, ctx->out_fd, ctx->out_ctype, + ctx->out_chunk_size, + ctx->comp_ctx, ctx->write_resource_flags, ctx->progress_data); } @@ -1355,15 +1460,17 @@ submit_stream_for_compression(struct wim_lookup_table_entry *lte, /* Read the entire stream @lte, feeding its data chunks to the * compressor threads. Also SHA1-sum the stream; this is required in * the case that @lte is unhashed, and a nice additional verification - * when @lte is already hashed. */ + * when @lte is already hashed. */ sha1_init(&ctx->next_sha_ctx); ctx->next_chunk = 0; - ctx->next_num_chunks = wim_resource_chunks(lte); + ctx->next_num_chunks = DIV_ROUND_UP(wim_resource_size(lte), + ctx->out_chunk_size); ctx->next_lte = lte; INIT_LIST_HEAD(<e->msg_list); list_add_tail(<e->being_compressed_list, &ctx->outstanding_streams); ret = read_resource_prefix(lte, wim_resource_size(lte), - main_writer_thread_cb, ctx, 0); + main_writer_thread_cb, + ctx->out_chunk_size, ctx, 0); if (ret) return ret; wimlib_assert(ctx->next_chunk == ctx->next_num_chunks); @@ -1377,15 +1484,13 @@ main_thread_process_next_stream(struct wim_lookup_table_entry *lte, void *_ctx) int ret; if (wim_resource_size(lte) < 1000 || - ctx->out_ctype == WIMLIB_COMPRESSION_TYPE_NONE || - (lte->resource_location == RESOURCE_IN_WIM && - !(ctx->write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS) && - lte->wim->compression_type == ctx->out_ctype)) + !must_compress_stream(lte, ctx->write_resource_flags, + ctx->out_ctype, ctx->out_chunk_size)) { /* Stream is too small or isn't being compressed. Process it by * the main thread when we have a chance. We can't necessarily * process it right here, as the main thread could be in the - * middle of writing a different stream. */ + * middle of writing a different stream. */ list_add_tail(<e->write_streams_list, &ctx->serial_streams); lte->deferred = 1; ret = 0; @@ -1412,15 +1517,15 @@ get_default_num_threads(void) * create the number of threads requested. * * High level description of the algorithm for writing compressed streams in - * parallel: We perform compression on chunks of size WIM_CHUNK_SIZE bytes - * rather than on full files. The currently executing thread becomes the main - * thread and is entirely in charge of reading the data to compress (which may - * be in any location understood by the resource code--- such as in an external - * file being captured, or in another WIM file from which an image is being - * exported) and actually writing the compressed data to the output file. - * Additional threads are "compressor threads" and all execute the - * compressor_thread_proc, where they repeatedly retrieve buffers of data from - * the main thread, compress them, and hand them back to the main thread. + * parallel: We perform compression on chunks rather than on full files. The + * currently executing thread becomes the main thread and is entirely in charge + * of reading the data to compress (which may be in any location understood by + * the resource code--- such as in an external file being captured, or in + * another WIM file from which an image is being exported) and actually writing + * the compressed data to the output file. Additional threads are "compressor + * threads" and all execute the compressor_thread_proc, where they repeatedly + * retrieve buffers of data from the main thread, compress them, and hand them + * back to the main thread. * * Certain streams, such as streams that do not need to be compressed (e.g. * input compression type same as output compression type) or streams of very @@ -1430,13 +1535,14 @@ get_default_num_threads(void) * At any given point in time, multiple streams may be having chunks compressed * concurrently. The stream that the main thread is currently *reading* may be * later in the list that the stream that the main thread is currently - * *writing*. - */ + * *writing*. */ static int write_stream_list_parallel(struct list_head *stream_list, struct wim_lookup_table *lookup_table, struct filedes *out_fd, int out_ctype, + u32 out_chunk_size, + struct wimlib_lzx_context **comp_ctx, int write_resource_flags, struct write_streams_progress_data *progress_data, unsigned num_threads) @@ -1446,12 +1552,14 @@ write_stream_list_parallel(struct list_head *stream_list, struct shared_queue compressed_res_queue; pthread_t *compressor_threads = NULL; union wimlib_progress_info *progress = &progress_data->progress; + unsigned num_started_threads; + bool can_retry = true; if (num_threads == 0) { long nthreads = get_default_num_threads(); if (nthreads < 1 || nthreads > UINT_MAX) { WARNING("Could not determine number of processors! Assuming 1"); - goto out_serial; + goto out_serial_quiet; } else if (nthreads == 1) { goto out_serial_quiet; } else { @@ -1478,30 +1586,47 @@ write_stream_list_parallel(struct list_head *stream_list, if (ret) 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); + struct compressor_thread_params *params; - compressor_threads = MALLOC(num_threads * sizeof(pthread_t)); - if (!compressor_threads) { + params = CALLOC(num_threads, sizeof(params[0])); + if (params == NULL) { ret = WIMLIB_ERR_NOMEM; goto out_destroy_compressed_res_queue; } + for (unsigned i = 0; i < num_threads; i++) { + params[i].res_to_compress_queue = &res_to_compress_queue; + params[i].compressed_res_queue = &compressed_res_queue; + params[i].out_ctype = out_ctype; + if (out_ctype == WIMLIB_COMPRESSION_TYPE_LZX) { + ret = wimlib_lzx_alloc_context(out_chunk_size, + NULL, ¶ms[i].comp_ctx); + if (ret) + goto out_free_params; + } + } + + compressor_threads = MALLOC(num_threads * sizeof(pthread_t)); + if (compressor_threads == NULL) { + ret = WIMLIB_ERR_NOMEM; + goto out_free_params; + } + for (unsigned i = 0; i < num_threads; i++) { DEBUG("pthread_create thread %u of %u", i + 1, num_threads); ret = pthread_create(&compressor_threads[i], NULL, - compressor_thread_proc, ¶ms); - if (ret != 0) { + compressor_thread_proc, ¶ms[i]); + if (ret) { + errno = ret; ret = -1; ERROR_WITH_ERRNO("Failed to create compressor " "thread %u of %u", i + 1, num_threads); - num_threads = i; + num_started_threads = i; goto out_join; } } + num_started_threads = num_threads; if (progress_data->progress_func) { progress_data->progress_func(WIMLIB_PROGRESS_MSG_WRITE_STREAMS, @@ -1509,10 +1634,15 @@ write_stream_list_parallel(struct list_head *stream_list, } struct main_writer_thread_ctx ctx; + + memset(&ctx, 0, sizeof(ctx)); + ctx.stream_list = stream_list; ctx.lookup_table = lookup_table; ctx.out_fd = out_fd; ctx.out_ctype = out_ctype; + ctx.out_chunk_size = out_chunk_size; + ctx.comp_ctx = comp_ctx; ctx.res_to_compress_queue = &res_to_compress_queue; ctx.compressed_res_queue = &compressed_res_queue; ctx.num_messages = queue_size; @@ -1521,6 +1651,8 @@ write_stream_list_parallel(struct list_head *stream_list, ret = main_writer_thread_init_ctx(&ctx); if (ret) goto out_join; + + can_retry = false; ret = do_write_stream_list(stream_list, lookup_table, main_thread_process_next_stream, &ctx, progress_data); @@ -1532,15 +1664,15 @@ write_stream_list_parallel(struct list_head *stream_list, * chunks to be compressed so that the remaining streams can actually be * written to the output file. Furthermore, any remaining streams that * had processing deferred to the main thread need to be handled. These - * tasks are done by the main_writer_thread_finish() function. */ + * tasks are done by the main_writer_thread_finish() function. */ ret = main_writer_thread_finish(&ctx); out_destroy_ctx: main_writer_thread_destroy_ctx(&ctx); out_join: - for (unsigned i = 0; i < num_threads; i++) + for (unsigned i = 0; i < num_started_threads; i++) shared_queue_put(&res_to_compress_queue, NULL); - for (unsigned i = 0; i < num_threads; i++) { + for (unsigned i = 0; i < num_started_threads; i++) { if (pthread_join(compressor_threads[i], NULL)) { WARNING_WITH_ERRNO("Failed to join compressor " "thread %u of %u", @@ -1548,11 +1680,15 @@ out_join: } } FREE(compressor_threads); +out_free_params: + for (unsigned i = 0; i < num_threads; i++) + wimlib_lzx_free_context(params[i].comp_ctx); + FREE(params); out_destroy_compressed_res_queue: 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) + if (!can_retry || (ret >= 0 && ret != WIMLIB_ERR_NOMEM)) return ret; out_serial: WARNING("Falling back to single-threaded compression"); @@ -1561,63 +1697,74 @@ out_serial_quiet: lookup_table, out_fd, out_ctype, + out_chunk_size, + comp_ctx, write_resource_flags, progress_data); } #endif -/* - * Write a list of streams to a WIM (@out_fd) using the compression type - * @out_ctype and up to @num_threads compressor threads. - */ +/* Write a list of streams to a WIM (@out_fd) using the compression type + * @out_ctype, chunk size @out_chunk_size, and up to @num_threads compressor + * threads. */ static int write_stream_list(struct list_head *stream_list, struct wim_lookup_table *lookup_table, - struct filedes *out_fd, int out_ctype, int write_flags, + struct filedes *out_fd, int out_ctype, + u32 out_chunk_size, + struct wimlib_lzx_context **comp_ctx, + int write_flags, unsigned num_threads, wimlib_progress_func_t progress_func) { - struct wim_lookup_table_entry *lte; - size_t num_streams = 0; - u64 total_bytes = 0; - u64 total_compression_bytes = 0; - struct write_streams_progress_data progress_data; int ret; int write_resource_flags; - unsigned total_parts = 0; - WIMStruct *prev_wim_part = NULL; + u64 total_bytes; + u64 total_compression_bytes; + unsigned total_parts; + WIMStruct *prev_wim_part; + size_t num_streams; + struct wim_lookup_table_entry *lte; + struct write_streams_progress_data progress_data; - if (list_empty(stream_list)) + if (list_empty(stream_list)) { + DEBUG("No streams to write."); return 0; + } write_resource_flags = write_flags_to_resource_flags(write_flags); - DEBUG("write_resource_flags=0x%08x", write_resource_flags); + DEBUG("Writing stream list (offset = %"PRIu64", write_resource_flags=0x%08x)", + out_fd->offset, write_resource_flags); - sort_stream_list_by_sequential_order(stream_list, - offsetof(struct wim_lookup_table_entry, - write_streams_list)); + /* Sort the stream list into a good order for reading. */ + ret = sort_stream_list_by_sequential_order(stream_list, + offsetof(struct wim_lookup_table_entry, + write_streams_list)); + if (ret) + return ret; /* Calculate the total size of the streams to be written. Note: this * will be the uncompressed size, as we may not know the compressed size * yet, and also this will assume that every unhashed stream will be - * written (which will not necessarily be the case). */ + * written (which will not necessarily be the case). */ + total_bytes = 0; + total_compression_bytes = 0; + num_streams = 0; + total_parts = 0; + prev_wim_part = NULL; list_for_each_entry(lte, stream_list, write_streams_list) { num_streams++; total_bytes += wim_resource_size(lte); - if (out_ctype != WIMLIB_COMPRESSION_TYPE_NONE - && (wim_resource_compression_type(lte) != out_ctype || - (write_resource_flags & WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS))) - { + if (must_compress_stream(lte, write_resource_flags, + out_ctype, out_chunk_size)) total_compression_bytes += wim_resource_size(lte); - } if (lte->resource_location == RESOURCE_IN_WIM) { if (prev_wim_part != lte->wim) { prev_wim_part = lte->wim; total_parts++; } } - } memset(&progress_data, 0, sizeof(progress_data)); @@ -1641,6 +1788,8 @@ write_stream_list(struct list_head *stream_list, lookup_table, out_fd, out_ctype, + out_chunk_size, + comp_ctx, write_resource_flags, &progress_data, num_threads); @@ -1650,12 +1799,14 @@ write_stream_list(struct list_head *stream_list, lookup_table, out_fd, out_ctype, + out_chunk_size, + comp_ctx, write_resource_flags, &progress_data); if (ret == 0) DEBUG("Successfully wrote stream list."); else - DEBUG("Failed to write stream list."); + DEBUG("Failed to write stream list (ret=%d).", ret); return ret; } @@ -1705,136 +1856,52 @@ stream_size_table_insert(struct wim_lookup_table_entry *lte, void *_tab) return 0; } - -struct lte_overwrite_prepare_args { +struct find_streams_ctx { WIMStruct *wim; - off_t end_offset; + int write_flags; struct list_head stream_list; struct stream_size_table stream_size_tab; }; -/* First phase of preparing streams for an in-place overwrite. This is called - * on all streams, both hashed and unhashed, except the metadata resources. */ -static int -lte_overwrite_prepare(struct wim_lookup_table_entry *lte, void *_args) +static void +lte_reference_for_logical_write(struct wim_lookup_table_entry *lte, + struct find_streams_ctx *ctx, + unsigned nref) { - struct lte_overwrite_prepare_args *args = _args; - - wimlib_assert(!(lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)); - if (lte->resource_location != RESOURCE_IN_WIM || lte->wim != args->wim) - list_add_tail(<e->write_streams_list, &args->stream_list); - lte->out_refcnt = lte->refcnt; - stream_size_table_insert(lte, &args->stream_size_tab); - return 0; + if (lte->out_refcnt == 0) { + stream_size_table_insert(lte, &ctx->stream_size_tab); + list_add_tail(<e->write_streams_list, &ctx->stream_list); + } + lte->out_refcnt += nref; } -/* Second phase of preparing streams for an in-place overwrite. This is called - * on existing metadata resources and hashed streams, but not unhashed streams. - * - * NOTE: lte->output_resource_entry is in union with lte->hash_list_2, so - * lte_overwrite_prepare_2() must be called after lte_overwrite_prepare(), as - * the latter uses lte->hash_list_2, while the former expects to set - * lte->output_resource_entry. */ static int -lte_overwrite_prepare_2(struct wim_lookup_table_entry *lte, void *_args) +do_lte_full_reference_for_logical_write(struct wim_lookup_table_entry *lte, + void *_ctx) { - struct lte_overwrite_prepare_args *args = _args; - - if (lte->resource_location == RESOURCE_IN_WIM && lte->wim == args->wim) { - /* We can't do an in place overwrite on the WIM if there are - * streams after the XML data. */ - if (lte->resource_entry.offset + - lte->resource_entry.size > args->end_offset) - { - if (wimlib_print_errors) { - ERROR("The following resource is after the XML data:"); - print_lookup_table_entry(lte, stderr); - } - return WIMLIB_ERR_RESOURCE_ORDER; - } - copy_resource_entry(<e->output_resource_entry, - <e->resource_entry); - } + struct find_streams_ctx *ctx = _ctx; + lte->out_refcnt = 0; + lte_reference_for_logical_write(lte, ctx, + (lte->refcnt ? lte->refcnt : 1)); return 0; } -/* Given a WIM that we are going to overwrite in place with zero or more - * additional streams added, construct a list the list of new unique streams - * ('struct wim_lookup_table_entry's) that must be written, plus any unhashed - * streams that need to be added but may be identical to other hashed or - * unhashed streams. These unhashed streams are checksummed while the streams - * are being written. To aid this process, the member @unique_size is set to 1 - * on streams that have a unique size and therefore must be written. - * - * The out_refcnt member of each 'struct wim_lookup_table_entry' is set to - * indicate the number of times the stream is referenced in only the streams - * that are being written; this may still be adjusted later when unhashed - * streams are being resolved. - */ static int -prepare_streams_for_overwrite(WIMStruct *wim, off_t end_offset, - struct list_head *stream_list) -{ - int ret; - struct lte_overwrite_prepare_args args; - unsigned i; - - args.wim = wim; - args.end_offset = end_offset; - ret = init_stream_size_table(&args.stream_size_tab, - wim->lookup_table->capacity); - if (ret) - return ret; - - INIT_LIST_HEAD(&args.stream_list); - for (i = 0; i < wim->hdr.image_count; i++) { - struct wim_image_metadata *imd; - struct wim_lookup_table_entry *lte; - - imd = wim->image_metadata[i]; - image_for_each_unhashed_stream(lte, imd) - lte_overwrite_prepare(lte, &args); - } - for_lookup_table_entry(wim->lookup_table, lte_overwrite_prepare, &args); - list_transfer(&args.stream_list, stream_list); - - for (i = 0; i < wim->hdr.image_count; i++) { - ret = lte_overwrite_prepare_2(wim->image_metadata[i]->metadata_lte, - &args); - if (ret) - goto out_destroy_stream_size_table; - } - ret = for_lookup_table_entry(wim->lookup_table, - lte_overwrite_prepare_2, &args); -out_destroy_stream_size_table: - destroy_stream_size_table(&args.stream_size_tab); - return ret; -} - - -struct find_streams_ctx { - struct list_head stream_list; - struct stream_size_table stream_size_tab; -}; - -static void inode_find_streams_to_write(struct wim_inode *inode, struct wim_lookup_table *table, - struct list_head *stream_list, - struct stream_size_table *tab) + struct find_streams_ctx *ctx) { struct wim_lookup_table_entry *lte; - for (unsigned i = 0; i <= inode->i_num_ads; i++) { + unsigned i; + + for (i = 0; i <= inode->i_num_ads; i++) { lte = inode_stream_lte(inode, i, table); - if (lte) { - if (lte->out_refcnt == 0) { - if (lte->unhashed) - stream_size_table_insert(lte, tab); - list_add_tail(<e->write_streams_list, stream_list); - } - lte->out_refcnt += inode->i_nlink; - } + if (lte) + lte_reference_for_logical_write(lte, ctx, inode->i_nlink); + else if (!is_zero_hash(inode_stream_hash(inode, i))) + return WIMLIB_ERR_RESOURCE_NOT_FOUND; } + return 0; } static int @@ -1844,6 +1911,7 @@ image_find_streams_to_write(WIMStruct *wim) struct wim_image_metadata *imd; struct wim_inode *inode; struct wim_lookup_table_entry *lte; + int ret; ctx = wim->private; imd = wim_get_current_image_metadata(wim); @@ -1854,55 +1922,174 @@ image_find_streams_to_write(WIMStruct *wim) /* Go through this image's inodes to find any streams that have not been * found yet. */ image_for_each_inode(inode, imd) { - inode_find_streams_to_write(inode, wim->lookup_table, - &ctx->stream_list, - &ctx->stream_size_tab); + ret = inode_find_streams_to_write(inode, wim->lookup_table, ctx); + if (ret) + return ret; } return 0; } -/* Given a WIM that from which one or all of the images is being written, build - * the list of unique streams ('struct wim_lookup_table_entry's) that must be - * written, plus any unhashed streams that need to be written but may be - * identical to other hashed or unhashed streams being written. These unhashed - * streams are checksummed while the streams are being written. To aid this - * process, the member @unique_size is set to 1 on streams that have a unique - * size and therefore must be written. +/* + * Build a list of streams (via `struct wim_lookup_table_entry's) included in + * the "logical write" of the WIM, meaning all streams that are referenced at + * least once by dentries in the the image(s) being written. 'out_refcnt' on + * each stream being included in the logical write is set to the number of + * references from dentries in the image(s). Furthermore, 'unique_size' on each + * stream being included in the logical write is set to indicate whether that + * stream has a unique size relative to the streams being included in the + * logical write. Still furthermore, 'part_number' on each stream being + * included in the logical write is set to the part number given in the + * in-memory header of @p wim. * - * The out_refcnt member of each 'struct wim_lookup_table_entry' is set to - * indicate the number of times the stream is referenced in only the streams - * that are being written; this may still be adjusted later when unhashed - * streams are being resolved. + * This is considered a "logical write" because it does not take into account + * filtering out streams already present in the WIM (in the case of an in place + * overwrite) or present in other WIMs (in case of creating delta WIM). */ static int -prepare_stream_list(WIMStruct *wim, int image, struct list_head *stream_list) +prepare_logical_stream_list(WIMStruct *wim, int image, bool streams_ok, + struct find_streams_ctx *ctx) { int ret; - struct find_streams_ctx ctx; + struct wim_lookup_table_entry *lte; - DEBUG("Preparing list of streams to write for image %d.", image); + if (streams_ok && (image == WIMLIB_ALL_IMAGES || + (image == 1 && wim->hdr.image_count == 1))) + { + /* Fast case: Assume that all streams are being written and + * that the reference counts are correct. */ + struct wim_lookup_table_entry *lte; + struct wim_image_metadata *imd; + unsigned i; + + for_lookup_table_entry(wim->lookup_table, + do_lte_full_reference_for_logical_write, ctx); + for (i = 0; i < wim->hdr.image_count; i++) { + imd = wim->image_metadata[i]; + image_for_each_unhashed_stream(lte, imd) + do_lte_full_reference_for_logical_write(lte, ctx); + } + } else { + /* Slow case: Walk through the images being written and + * determine the streams referenced. */ + for_lookup_table_entry(wim->lookup_table, lte_zero_out_refcnt, NULL); + wim->private = ctx; + ret = for_image(wim, image, image_find_streams_to_write); + if (ret) + return ret; + } + + list_for_each_entry(lte, &ctx->stream_list, write_streams_list) + lte->part_number = wim->hdr.part_number; + return 0; +} + +static int +process_filtered_stream(struct wim_lookup_table_entry *lte, void *_ctx) +{ + struct find_streams_ctx *ctx = _ctx; + u16 filtered = 0; + + /* Calculate and set lte->filtered. */ + if (lte->resource_location == RESOURCE_IN_WIM) { + if (lte->wim == ctx->wim && + (ctx->write_flags & WIMLIB_WRITE_FLAG_OVERWRITE)) + filtered |= FILTERED_SAME_WIM; + if (lte->wim != ctx->wim && + (ctx->write_flags & WIMLIB_WRITE_FLAG_SKIP_EXTERNAL_WIMS)) + filtered |= FILTERED_EXTERNAL_WIM; + } + lte->filtered = filtered; + + /* Filtered streams get inserted into the stream size table too, unless + * they already were. This is because streams that are checksummed + * on-the-fly during the write should not be written if they are + * duplicates of filtered stream. */ + if (lte->filtered && lte->out_refcnt == 0) + stream_size_table_insert(lte, &ctx->stream_size_tab); + return 0; +} + +static int +mark_stream_not_filtered(struct wim_lookup_table_entry *lte, void *_ignore) +{ + lte->filtered = 0; + return 0; +} + +/* Given the list of streams to include in a logical write of a WIM, handle + * filtering out streams already present in the WIM or already present in + * external WIMs, depending on the write flags provided. */ +static void +handle_stream_filtering(struct find_streams_ctx *ctx) +{ + struct wim_lookup_table_entry *lte, *tmp; + + if (!(ctx->write_flags & (WIMLIB_WRITE_FLAG_OVERWRITE | + WIMLIB_WRITE_FLAG_SKIP_EXTERNAL_WIMS))) + { + for_lookup_table_entry(ctx->wim->lookup_table, + mark_stream_not_filtered, ctx); + return; + } + + for_lookup_table_entry(ctx->wim->lookup_table, + process_filtered_stream, ctx); + + /* Streams in logical write list that were filtered can be removed. */ + list_for_each_entry_safe(lte, tmp, &ctx->stream_list, + write_streams_list) + if (lte->filtered) + list_del(<e->write_streams_list); +} + +/* Prepares list of streams to write for the specified WIM image(s). This wraps + * around prepare_logical_stream_list() to handle filtering out streams already + * present in the WIM or already present in external WIMs, depending on the + * write flags provided. + * + * Note: some additional data is stored in each `struct wim_lookup_table_entry': + * + * - 'out_refcnt' is set to the number of references found for the logical write. + * This will be nonzero on all streams in the list returned by this function, + * but will also be nonzero on streams not in the list that were included in + * the logical write list, but filtered out from the returned list. + * - 'filtered' is set to nonzero if the stream was filtered. Filtered streams + * are not included in the list of streams returned by this function. + * - 'unique_size' is set if the stream has a unique size among all streams in + * the logical write plus any filtered streams in the entire WIM that could + * potentially turn out to have the same checksum as a yet-to-be-checksummed + * stream being written. + */ +static int +prepare_stream_list(WIMStruct *wim, int image, int write_flags, + struct list_head *stream_list) +{ + int ret; + bool streams_ok; + struct find_streams_ctx ctx; - for_lookup_table_entry(wim->lookup_table, lte_zero_out_refcnt, NULL); + INIT_LIST_HEAD(&ctx.stream_list); ret = init_stream_size_table(&ctx.stream_size_tab, wim->lookup_table->capacity); if (ret) return ret; - for_lookup_table_entry(wim->lookup_table, stream_size_table_insert, - &ctx.stream_size_tab); - INIT_LIST_HEAD(&ctx.stream_list); - wim->private = &ctx; - ret = for_image(wim, image, image_find_streams_to_write); - destroy_stream_size_table(&ctx.stream_size_tab); + ctx.write_flags = write_flags; + ctx.wim = wim; + + streams_ok = ((write_flags & WIMLIB_WRITE_FLAG_STREAMS_OK) != 0); + + ret = prepare_logical_stream_list(wim, image, streams_ok, &ctx); if (ret) - return ret; + goto out_destroy_table; + + handle_stream_filtering(&ctx); list_transfer(&ctx.stream_list, stream_list); - return 0; + ret = 0; +out_destroy_table: + destroy_stream_size_table(&ctx.stream_size_tab); + return ret; } -/* Writes the streams for the specified @image in @wim to @wim->out_fd. - * Alternatively, if @stream_list_override is specified, it is taken to be the - * list of streams to write (connected with 'write_streams_list') and @image is - * ignored. */ static int write_wim_streams(WIMStruct *wim, int image, int write_flags, unsigned num_threads, @@ -1914,26 +2101,30 @@ write_wim_streams(WIMStruct *wim, int image, int write_flags, struct list_head *stream_list; struct wim_lookup_table_entry *lte; - if (stream_list_override) { - stream_list = stream_list_override; - list_for_each_entry(lte, stream_list, write_streams_list) { - if (lte->refcnt) - lte->out_refcnt = lte->refcnt; - else - lte->out_refcnt = 1; - } - } else { + if (stream_list_override == NULL) { + /* Normal case: prepare stream list from image(s) being written. + */ stream_list = &_stream_list; - ret = prepare_stream_list(wim, image, stream_list); + ret = prepare_stream_list(wim, image, write_flags, stream_list); if (ret) return ret; + } else { + /* Currently only as a result of wimlib_split() being called: + * use stream list already explicitly provided. Use existing + * reference counts. */ + stream_list = stream_list_override; + list_for_each_entry(lte, stream_list, write_streams_list) { + lte->out_refcnt = (lte->refcnt ? lte->refcnt : 1); + lte->part_number = wim->hdr.part_number; + } } - list_for_each_entry(lte, stream_list, write_streams_list) - lte->part_number = wim->hdr.part_number; + return write_stream_list(stream_list, wim->lookup_table, &wim->out_fd, - wim->compression_type, + wim->out_compression_type, + wim->out_chunk_size, + &wim->lzx_context, write_flags, num_threads, progress_func); @@ -1948,8 +2139,10 @@ write_wim_metadata_resources(WIMStruct *wim, int image, int write_flags, int end_image; int write_resource_flags; - if (write_flags & WIMLIB_WRITE_FLAG_NO_METADATA) + if (write_flags & WIMLIB_WRITE_FLAG_NO_METADATA) { + DEBUG("Not writing any metadata resources."); return 0; + } write_resource_flags = write_flags_to_resource_flags(write_flags); @@ -1971,15 +2164,30 @@ write_wim_metadata_resources(WIMStruct *wim, int image, int write_flags, struct wim_image_metadata *imd; imd = wim->image_metadata[i - 1]; + /* Build a new metadata resource only if image was modified from + * the original (or was newly added). Otherwise just copy the + * existing one. */ if (imd->modified) { + DEBUG("Image %u was modified; building and writing new " + "metadata resource", i); ret = write_metadata_resource(wim, i, write_resource_flags); + } else if (write_flags & WIMLIB_WRITE_FLAG_OVERWRITE) { + DEBUG("Image %u was not modified; re-using existing " + "metadata resource.", i); + copy_resource_entry(&imd->metadata_lte->output_resource_entry, + &imd->metadata_lte->resource_entry); + ret = 0; } else { + DEBUG("Image %u was not modified; copying existing " + "metadata resource.", i); ret = write_wim_resource(imd->metadata_lte, &wim->out_fd, - wim->compression_type, + wim->out_compression_type, + wim->out_chunk_size, &imd->metadata_lte->output_resource_entry, - write_resource_flags); + write_resource_flags, + &wim->lzx_context); } if (ret) return ret; @@ -2009,18 +2217,22 @@ close_wim_writable(WIMStruct *wim, int write_flags) { int ret = 0; - if (!(write_flags & WIMLIB_WRITE_FLAG_FILE_DESCRIPTOR)) + if (!(write_flags & WIMLIB_WRITE_FLAG_FILE_DESCRIPTOR)) { + DEBUG("Closing WIM file."); if (filedes_valid(&wim->out_fd)) if (filedes_close(&wim->out_fd)) ret = WIMLIB_ERR_WRITE; + } filedes_invalidate(&wim->out_fd); return ret; } /* + * finish_write(): + * * Finish writing a WIM file: write the lookup table, xml data, and integrity - * table, then overwrite the WIM header. Always closes the WIM file descriptor - * (wim->out_fd). + * table, then overwrite the WIM header. By default, closes the WIM file + * descriptor (@wim->out_fd) if successful. * * write_flags is a bitwise OR of the following: * @@ -2030,7 +2242,7 @@ close_wim_writable(WIMStruct *wim, int write_flags) * (public) WIMLIB_WRITE_FLAG_FSYNC: * fsync() the output file before closing it. * - * (public) WIMLIB_WRITE_FLAG_PIPABLE: + * (public) WIMLIB_WRITE_FLAG_PIPABLE: * Writing a pipable WIM, possibly to a pipe; include pipable WIM * stream headers before the lookup table and XML data, and also * write the WIM header at the end instead of seeking to the @@ -2053,6 +2265,9 @@ close_wim_writable(WIMStruct *wim, int write_flags) * Instead of overwriting the WIM header at the beginning of the * file, simply append it to the end of the file. (Used when * writing to pipe.) + * (private) WIMLIB_WRITE_FLAG_FILE_DESCRIPTOR: + * Do not close the file descriptor @wim->out_fd on either success + * on failure. * (private) WIMLIB_WRITE_FLAG_USE_EXISTING_TOTALBYTES: * Use the existing stored in the in-memory XML * information, rather than setting it to the offset of the XML @@ -2070,6 +2285,8 @@ finish_write(WIMStruct *wim, int image, int write_flags, off_t new_lookup_table_end; u64 xml_totalbytes; + DEBUG("image=%d, write_flags=%08x", image, write_flags); + write_resource_flags = write_flags_to_resource_flags(write_flags); /* In the WIM header, there is room for the resource entry for a @@ -2093,7 +2310,7 @@ finish_write(WIMStruct *wim, int image, int write_flags, &wim->hdr.lookup_table_res_entry, stream_list_override); if (ret) - goto out_close_wim; + return ret; } /* Write XML data. */ @@ -2104,8 +2321,9 @@ finish_write(WIMStruct *wim, int image, int write_flags, &wim->hdr.xml_res_entry, write_resource_flags); if (ret) - goto out_close_wim; + return ret; + /* Write integrity table (optional). */ if (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) { if (write_flags & WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML) { struct wim_header checkpoint_hdr; @@ -2115,7 +2333,7 @@ finish_write(WIMStruct *wim, int image, int write_flags, ret = write_wim_header_at_offset(&checkpoint_hdr, &wim->out_fd, 0); if (ret) - goto out_close_wim; + return ret; } if (!(write_flags & WIMLIB_WRITE_FLAG_REUSE_INTEGRITY_TABLE)) @@ -2129,36 +2347,45 @@ finish_write(WIMStruct *wim, int image, int write_flags, old_lookup_table_end, progress_func); if (ret) - goto out_close_wim; + return ret; } else { + /* No integrity table. */ zero_resource_entry(&wim->hdr.integrity); } + /* Now that all information in the WIM header has been determined, the + * preliminary header written earlier can be overwritten, the header of + * the existing WIM file can be overwritten, or the final header can be + * written to the end of the pipable WIM. */ wim->hdr.flags &= ~WIM_HDR_FLAG_WRITE_IN_PROGRESS; hdr_offset = 0; if (write_flags & WIMLIB_WRITE_FLAG_HEADER_AT_END) hdr_offset = wim->out_fd.offset; + DEBUG("Writing new header @ %"PRIu64".", hdr_offset); ret = write_wim_header_at_offset(&wim->hdr, &wim->out_fd, hdr_offset); if (ret) - goto out_close_wim; + return ret; + /* Possibly sync file data to disk before closing. On POSIX systems, it + * is necessary to do this before using rename() to overwrite an + * existing file with a new file. Otherwise, data loss would occur if + * the system is abruptly terminated when the metadata for the rename + * operation has been written to disk, but the new file data has not. + */ if (write_flags & WIMLIB_WRITE_FLAG_FSYNC) { + DEBUG("Syncing WIM file."); if (fsync(wim->out_fd.fd)) { ERROR_WITH_ERRNO("Error syncing data to WIM file"); - ret = WIMLIB_ERR_WRITE; - goto out_close_wim; + return WIMLIB_ERR_WRITE; } } - ret = 0; -out_close_wim: if (close_wim_writable(wim, write_flags)) { - if (ret == 0) { - ERROR_WITH_ERRNO("Failed to close the output WIM file"); - ret = WIMLIB_ERR_WRITE; - } + ERROR_WITH_ERRNO("Failed to close the output WIM file"); + return WIMLIB_ERR_WRITE; } - return ret; + + return 0; } #if defined(HAVE_SYS_FILE_H) && defined(HAVE_FLOCK) @@ -2188,8 +2415,10 @@ lock_wim(WIMStruct *wim, int fd) #endif /* + * write_pipable_wim(): + * * Perform the intermediate stages of creating a "pipable" WIM (i.e. a WIM - * capable of being applied from a pipe). Such a WIM looks like: + * capable of being applied from a pipe). * * Pipable WIMs are a wimlib-specific modification of the WIM format such that * images can be applied from them sequentially when the file data is sent over @@ -2198,7 +2427,7 @@ lock_wim(WIMStruct *wim, int fd) * * - Magic characters in header are "WLPWM\0\0\0" (wimlib pipable WIM) instead * of "MSWIM\0\0\0". This lets wimlib know that the WIM is pipable and also - * should stop other software from trying to read the file as a normal WIM. + * stops other software from trying to read the file as a normal WIM. * * - The header at the beginning of the file does not contain all the normal * information; in particular it will have all 0's for the lookup table and @@ -2220,10 +2449,13 @@ lock_wim(WIMStruct *wim, int fd) * uncompressed stream size, and flags that indicate whether the stream is * compressed. The data of uncompressed streams then follows literally, while * the data of compressed streams follows in a modified format. Compressed - * streams have no chunk table, since the chunk table cannot be written until - * all chunks have been compressed; instead, each compressed chunk is prefixed - * by a `struct pwm_chunk_hdr' that gives its size. However, the offsets are - * given in the chunk table as if these chunk headers were not present. + * streams do not begin with a chunk table, since the chunk table cannot be + * written until all chunks have been compressed. Instead, each compressed + * chunk is prefixed by a `struct pwm_chunk_hdr' that gives its size. + * Furthermore, the chunk table is written at the end of the resource instead + * of the start. Note: chunk offsets are given in the chunk table as if the + * `struct pwm_chunk_hdr's were not present; also, the chunk table is only + * used if the WIM is being read from a seekable file (not a pipe). * * - Metadata resources always come before other file resources (streams). * (This does not by itself constitute an incompatibility with normal WIMs, @@ -2240,15 +2472,20 @@ lock_wim(WIMStruct *wim, int fd) * * Layout of pipable WIM: * - * ----------+----------+--------------------+----------------+--------------+------------+--------+ - * | Header | XML data | Metadata resources | File resources | Lookup table | XML data | Header | - * ----------+----------+--------------------+----------------+--------------+------------+--------+ + * ---------+----------+--------------------+----------------+--------------+-----------+--------+ + * | Header | XML data | Metadata resources | File resources | Lookup table | XML data | Header | + * ---------+----------+--------------------+----------------+--------------+-----------+--------+ * * Layout of normal WIM: * - * +---------+--------------------+----------------+--------------+----------+ - * | Header | Metadata resources | File resources | Lookup table | XML data | - * +---------+--------------------+----------------+--------------+----------+ + * +--------+-----------------------------+-------------------------+ + * | Header | File and metadata resources | Lookup table | XML data | + * +--------+-----------------------------+-------------------------+ + * + * An optional integrity table can follow the final XML data in both normal and + * pipable WIMs. However, due to implementation details, wimlib currently can + * only include an integrity table in a pipable WIM when writing it to a + * seekable file (not a pipe). * * Do note that since pipable WIMs are not supported by Microsoft's software, * wimlib does not create them unless explicitly requested (with @@ -2362,7 +2599,8 @@ write_wim_part(WIMStruct *wim, DEBUG("Number of threads: %u", num_threads); DEBUG("Progress function: %s", (progress_func ? "yes" : "no")); DEBUG("Stream list: %s", (stream_list_override ? "specified" : "autodetect")); - DEBUG("GUID: %s", (guid ? "specified" : "generate new")); + DEBUG("GUID: %s", ((guid || wim->guid_set_explicitly) ? + "specified" : "generate new")); /* Internally, this is always called with a valid part number and total * parts. */ @@ -2374,9 +2612,12 @@ write_wim_part(WIMStruct *wim, (image < 1 || image > wim->hdr.image_count)) return WIMLIB_ERR_INVALID_IMAGE; - /* @wim must specify a standalone WIM. */ - if (wim->hdr.total_parts != 1) - return WIMLIB_ERR_SPLIT_UNSUPPORTED; + /* If we need to write metadata resources, make sure the ::WIMStruct has + * the needed information attached (e.g. is not a resource-only WIM, + * such as a non-first part of a split WIM). */ + if (!wim_has_metadata(wim) && + !(write_flags & WIMLIB_WRITE_FLAG_NO_METADATA)) + return WIMLIB_ERR_METADATA_NOT_FOUND; /* Check for contradictory flags. */ if ((write_flags & (WIMLIB_WRITE_FLAG_CHECK_INTEGRITY | @@ -2426,10 +2667,19 @@ write_wim_part(WIMStruct *wim, wim->hdr.part_number = part_number; wim->hdr.total_parts = total_parts; + /* Set compression type if different. */ + if (wim->compression_type != wim->out_compression_type) { + ret = set_wim_hdr_cflags(wim->out_compression_type, &wim->hdr); + wimlib_assert(ret == 0); + } + + /* Set chunk size if different. */ + wim->hdr.chunk_size = wim->out_chunk_size; + /* Use GUID if specified; otherwise generate a new one. */ if (guid) memcpy(wim->hdr.guid, guid, WIMLIB_GUID_LEN); - else + else if (!wim->guid_set_explicitly) randomize_byte_array(wim->hdr.guid, WIMLIB_GUID_LEN); /* Clear references to resources that have not been written yet. */ @@ -2528,7 +2778,8 @@ write_wim_part(WIMStruct *wim, stream_list_override); out_restore_hdr: memcpy(&wim->hdr, &hdr_save, sizeof(struct wim_header)); - close_wim_writable(wim, write_flags); + (void)close_wim_writable(wim, write_flags); + DEBUG("ret=%d", ret); return ret; } @@ -2582,6 +2833,40 @@ any_images_modified(WIMStruct *wim) return false; } +static int +check_resource_offset(struct wim_lookup_table_entry *lte, void *_wim) +{ + const WIMStruct *wim = _wim; + off_t end_offset = *(const off_t*)wim->private; + + if (lte->resource_location == RESOURCE_IN_WIM && lte->wim == wim && + lte->resource_entry.offset + lte->resource_entry.size > end_offset) + return WIMLIB_ERR_RESOURCE_ORDER; + return 0; +} + +/* Make sure no file or metadata resources are located after the XML data (or + * integrity table if present)--- otherwise we can't safely overwrite the WIM in + * place and we return WIMLIB_ERR_RESOURCE_ORDER. */ +static int +check_resource_offsets(WIMStruct *wim, off_t end_offset) +{ + int ret; + unsigned i; + + wim->private = &end_offset; + ret = for_lookup_table_entry(wim->lookup_table, check_resource_offset, wim); + if (ret) + return ret; + + for (i = 0; i < wim->hdr.image_count; i++) { + ret = check_resource_offset(wim->image_metadata[i]->metadata_lte, wim); + if (ret) + return ret; + } + return 0; +} + /* * Overwrite a WIM, possibly appending streams to it. * @@ -2648,7 +2933,7 @@ overwrite_wim_inplace(WIMStruct *wim, int write_flags, struct list_head stream_list; off_t old_wim_end; u64 old_lookup_table_end, old_xml_begin, old_xml_end; - + struct wim_header hdr_save; DEBUG("Overwriting `%"TS"' in-place", wim->filename); @@ -2658,6 +2943,10 @@ overwrite_wim_inplace(WIMStruct *wim, int write_flags, if (wim_has_integrity_table(wim)) write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY; + /* Set additional flags for overwrite. */ + write_flags |= WIMLIB_WRITE_FLAG_OVERWRITE | + WIMLIB_WRITE_FLAG_STREAMS_OK; + /* Make sure that the integrity table (if present) is after the XML * data, and that there are no stream resources, metadata resources, or * lookup tables after the XML data. Otherwise, these data would be @@ -2667,12 +2956,12 @@ overwrite_wim_inplace(WIMStruct *wim, int write_flags, old_lookup_table_end = wim->hdr.lookup_table_res_entry.offset + wim->hdr.lookup_table_res_entry.size; if (wim->hdr.integrity.offset != 0 && wim->hdr.integrity.offset < old_xml_end) { - ERROR("Didn't expect the integrity table to be before the XML data"); + WARNING("Didn't expect the integrity table to be before the XML data"); return WIMLIB_ERR_RESOURCE_ORDER; } if (old_lookup_table_end > old_xml_begin) { - ERROR("Didn't expect the lookup table to be after the XML data"); + WARNING("Didn't expect the lookup table to be after the XML data"); return WIMLIB_ERR_RESOURCE_ORDER; } @@ -2701,7 +2990,12 @@ overwrite_wim_inplace(WIMStruct *wim, int write_flags, old_wim_end = old_xml_end; } - ret = prepare_streams_for_overwrite(wim, old_wim_end, &stream_list); + ret = check_resource_offsets(wim, old_wim_end); + if (ret) + return ret; + + ret = prepare_stream_list(wim, WIMLIB_ALL_IMAGES, write_flags, + &stream_list); if (ret) return ret; @@ -2710,58 +3004,65 @@ overwrite_wim_inplace(WIMStruct *wim, int write_flags, return ret; ret = lock_wim(wim, wim->out_fd.fd); - if (ret) { - close_wim_writable(wim, write_flags); - return ret; - } + if (ret) + goto out_close_wim; + + /* Save original header so it can be restored in case of error */ + memcpy(&hdr_save, &wim->hdr, sizeof(struct wim_header)); /* Set WIM_HDR_FLAG_WRITE_IN_PROGRESS flag in header. */ - ret = write_wim_header_flags(wim->hdr.flags | WIM_HDR_FLAG_WRITE_IN_PROGRESS, - &wim->out_fd); + wim->hdr.flags |= WIM_HDR_FLAG_WRITE_IN_PROGRESS; + ret = write_wim_header_flags(wim->hdr.flags, &wim->out_fd); if (ret) { ERROR_WITH_ERRNO("Error updating WIM header flags"); - close_wim_writable(wim, write_flags); - goto out_unlock_wim; + goto out_restore_memory_hdr; } if (filedes_seek(&wim->out_fd, old_wim_end) == -1) { ERROR_WITH_ERRNO("Can't seek to end of WIM"); - close_wim_writable(wim, write_flags); ret = WIMLIB_ERR_WRITE; - goto out_unlock_wim; + goto out_restore_physical_hdr; } - DEBUG("Writing newly added streams (offset = %"PRIu64")", - old_wim_end); ret = write_stream_list(&stream_list, wim->lookup_table, &wim->out_fd, wim->compression_type, + wim->chunk_size, + &wim->lzx_context, write_flags, num_threads, progress_func); if (ret) goto out_truncate; - for (unsigned i = 1; i <= wim->hdr.image_count; i++) { - if (wim->image_metadata[i - 1]->modified) { - ret = write_metadata_resource(wim, i, 0); - if (ret) - goto out_truncate; - } - } + ret = write_wim_metadata_resources(wim, WIMLIB_ALL_IMAGES, + write_flags, progress_func); + if (ret) + goto out_truncate; + write_flags |= WIMLIB_WRITE_FLAG_REUSE_INTEGRITY_TABLE; ret = finish_write(wim, WIMLIB_ALL_IMAGES, write_flags, progress_func, NULL); + if (ret) + goto out_truncate; + + goto out_unlock_wim; + out_truncate: - close_wim_writable(wim, write_flags); - if (ret && !(write_flags & WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE)) { + if (!(write_flags & WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE)) { WARNING("Truncating `%"TS"' to its original size (%"PRIu64" bytes)", wim->filename, old_wim_end); - /* Return value of truncate() is ignored because this is already - * an error path. */ - (void)ttruncate(wim->filename, old_wim_end); + /* Return value of ftruncate() is ignored because this is + * already an error path. */ + (void)ftruncate(wim->out_fd.fd, old_wim_end); } +out_restore_physical_hdr: + (void)write_wim_header_flags(hdr_save.flags, &wim->out_fd); +out_restore_memory_hdr: + memcpy(&wim->hdr, &hdr_save, sizeof(struct wim_header)); +out_close_wim: + (void)close_wim_writable(wim, write_flags); out_unlock_wim: wim->wim_locked = 0; return ret; @@ -2788,18 +3089,28 @@ overwrite_wim_via_tmpfile(WIMStruct *wim, int write_flags, ret = wimlib_write(wim, tmpfile, WIMLIB_ALL_IMAGES, write_flags | WIMLIB_WRITE_FLAG_FSYNC, num_threads, progress_func); - if (ret) - goto out_unlink; + if (ret) { + tunlink(tmpfile); + return ret; + } close_wim(wim); + /* Rename the new WIM file to the original WIM file. Note: on Windows + * this actually calls win32_rename_replacement(), not _wrename(), so + * that removing the existing destination file can be handled. */ DEBUG("Renaming `%"TS"' to `%"TS"'", tmpfile, wim->filename); - /* Rename the new file to the old file .*/ - if (trename(tmpfile, wim->filename) != 0) { + ret = trename(tmpfile, wim->filename); + if (ret) { ERROR_WITH_ERRNO("Failed to rename `%"TS"' to `%"TS"'", tmpfile, wim->filename); - ret = WIMLIB_ERR_RENAME; - goto out_unlink; + #ifdef __WIN32__ + if (ret < 0) + #endif + { + tunlink(tmpfile); + } + return WIMLIB_ERR_RENAME; } if (progress_func) { @@ -2809,11 +3120,6 @@ overwrite_wim_via_tmpfile(WIMStruct *wim, int write_flags, progress_func(WIMLIB_PROGRESS_MSG_RENAME, &progress); } return 0; - -out_unlink: - /* Remove temporary file. */ - tunlink(tmpfile); - return ret; } /* API function documented in wimlib.h */ @@ -2844,7 +3150,9 @@ wimlib_overwrite(WIMStruct *wim, int write_flags, if ((!wim->deletion_occurred || (write_flags & WIMLIB_WRITE_FLAG_SOFT_DELETE)) && !(write_flags & (WIMLIB_WRITE_FLAG_REBUILD | WIMLIB_WRITE_FLAG_PIPABLE)) - && !(wim_is_pipable(wim))) + && !(wim_is_pipable(wim)) + && wim->compression_type == wim->out_compression_type + && wim->chunk_size == wim->out_chunk_size) { ret = overwrite_wim_inplace(wim, write_flags, num_threads, progress_func);