#include <stdlib.h>
#endif
-/* Reopens the FILE* for a WIM read-write. */
-static int reopen_rw(WIMStruct *w)
+static int do_fflush(FILE *fp)
{
- FILE *fp;
-
- if (fclose(w->fp) != 0)
- ERROR_WITH_ERRNO("Failed to close the file `%s'", w->filename);
- w->fp = NULL;
- fp = fopen(w->filename, "r+b");
- if (!fp) {
- ERROR_WITH_ERRNO("Failed to open `%s' for reading and writing",
- w->filename);
- return WIMLIB_ERR_OPEN;
- }
- w->fp = fp;
- return 0;
-}
-
-
-
-/*
- * Writes a WIM file to the original file that it was read from, overwriting it.
- */
-WIMLIBAPI int wimlib_overwrite(WIMStruct *w, int write_flags,
- unsigned num_threads)
-{
- const char *wimfile_name;
- size_t wim_name_len;
- int ret;
-
- if (!w)
- return WIMLIB_ERR_INVALID_PARAM;
-
- write_flags &= ~WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE;
-
- wimfile_name = w->filename;
-
- DEBUG("Replacing WIM file `%s'.", wimfile_name);
-
- if (!wimfile_name)
- return WIMLIB_ERR_NO_FILENAME;
-
- /* Write the WIM to a temporary file. */
- /* XXX should the temporary file be somewhere else? */
- wim_name_len = strlen(wimfile_name);
- char tmpfile[wim_name_len + 10];
- memcpy(tmpfile, wimfile_name, wim_name_len);
- randomize_char_array_with_alnum(tmpfile + wim_name_len, 9);
- tmpfile[wim_name_len + 9] = '\0';
-
- ret = wimlib_write(w, tmpfile, WIM_ALL_IMAGES, write_flags,
- num_threads);
+ int ret = fflush(fp);
if (ret != 0) {
- ERROR("Failed to write the WIM file `%s'", tmpfile);
- if (unlink(tmpfile) != 0)
- WARNING("Failed to remove `%s'", tmpfile);
- return ret;
- }
-
- DEBUG("Closing original WIM file.");
- /* Close the original WIM file that was opened for reading. */
- if (w->fp) {
- if (fclose(w->fp) != 0) {
- WARNING("Failed to close the file `%s'", wimfile_name);
- }
- w->fp = NULL;
- }
-
- DEBUG("Renaming `%s' to `%s'", tmpfile, wimfile_name);
-
- /* Rename the new file to the old file .*/
- if (rename(tmpfile, wimfile_name) != 0) {
- ERROR_WITH_ERRNO("Failed to rename `%s' to `%s'",
- tmpfile, wimfile_name);
- /* Remove temporary file. */
- if (unlink(tmpfile) != 0)
- ERROR_WITH_ERRNO("Failed to remove `%s'", tmpfile);
- return WIMLIB_ERR_RENAME;
- }
-
- if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS)
- printf("Successfully renamed `%s' to `%s'\n", tmpfile, wimfile_name);
-
- return 0;
-}
-
-static int check_resource_offset(struct lookup_table_entry *lte, void *arg)
-{
- u64 xml_data_offset = *(u64*)arg;
- if (lte->resource_entry.offset > xml_data_offset) {
- ERROR("The following resource is *after* the XML data:");
- print_lookup_table_entry(lte);
- return WIMLIB_ERR_RESOURCE_ORDER;
+ ERROR_WITH_ERRNO("Failed to flush data to output WIM file");
+ return WIMLIB_ERR_WRITE;
}
return 0;
}
-WIMLIBAPI int wimlib_overwrite_xml_and_header(WIMStruct *w, int write_flags)
+static int fflush_and_ftruncate(FILE *fp, off_t size)
{
int ret;
- FILE *fp;
- u8 *integrity_table = NULL;
- off_t xml_end;
- off_t xml_size;
- size_t bytes_written;
-
- DEBUG("Overwriting XML and header of `%s', write_flags = %#x",
- w->filename, write_flags);
-
- if (!w->filename)
- return WIMLIB_ERR_NO_FILENAME;
-
- write_flags &= ~WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE;
-
- /* 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
- * destroyed by this function. */
- if (w->hdr.integrity.offset != 0 &&
- w->hdr.integrity.offset < w->hdr.xml_res_entry.offset) {
- ERROR("Didn't expect the integrity table to be before the XML data");
- return WIMLIB_ERR_RESOURCE_ORDER;
- }
-
- if (w->hdr.lookup_table_res_entry.offset >
- w->hdr.xml_res_entry.offset) {
- ERROR("Didn't expect the lookup table to be after the XML data");
- return WIMLIB_ERR_RESOURCE_ORDER;
- }
-
- ret = for_lookup_table_entry(w->lookup_table, check_resource_offset,
- &w->hdr.xml_res_entry.offset);
- if (ret != 0)
- return ret;
- ret = reopen_rw(w);
+ ret = do_fflush(fp);
if (ret != 0)
return ret;
-
- fp = w->fp;
-
- /* The old integrity table is still OK, as the SHA1 message digests in
- * the integrity table include neither the header nor the XML data.
- * Save it for later if it exists and an integrity table was required.
- * */
- if ((write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY)
- && w->hdr.integrity.offset != 0)
- {
- DEBUG("Reading existing integrity table.");
- integrity_table = MALLOC(w->hdr.integrity.size);
- if (!integrity_table)
- return WIMLIB_ERR_NOMEM;
-
- ret = read_uncompressed_resource(fp, w->hdr.integrity.offset,
- w->hdr.integrity.original_size,
- integrity_table);
- if (ret != 0)
- goto err;
- DEBUG("Done reading existing integrity table.");
- }
-
- DEBUG("Overwriting XML data.");
- /* Overwrite the XML data. */
- if (fseeko(fp, w->hdr.xml_res_entry.offset, SEEK_SET) != 0) {
- ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" "
- "for XML data", w->hdr.xml_res_entry.offset);
- ret = WIMLIB_ERR_WRITE;
- goto err;
- }
- ret = write_xml_data(w->wim_info, WIM_ALL_IMAGES, fp, 0);
- if (ret != 0)
- goto err;
-
- DEBUG("Updating XML resource entry.");
- /* Update the XML resource entry in the WIM header. */
- xml_end = ftello(fp);
- if (xml_end == -1) {
- ret = WIMLIB_ERR_WRITE;
- goto err;
- }
- xml_size = xml_end - w->hdr.xml_res_entry.offset;
- w->hdr.xml_res_entry.size = xml_size;
- w->hdr.xml_res_entry.original_size = xml_size;
- /* XML data offset is unchanged. */
-
- if (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) {
- DEBUG("Writing integrity table.");
- w->hdr.integrity.offset = xml_end;
- if (integrity_table) {
- /* The existing integrity table was saved. */
- bytes_written = fwrite(integrity_table, 1,
- w->hdr.integrity.size, fp);
- if (bytes_written != w->hdr.integrity.size) {
- ERROR_WITH_ERRNO("Failed to write integrity "
- "table");
- ret = WIMLIB_ERR_WRITE;
- goto err;
- }
- FREE(integrity_table);
- } else {
- /* There was no existing integrity table, so a new one
- * must be calculated. */
- ret = write_integrity_table(fp, WIM_HEADER_DISK_SIZE,
- w->hdr.lookup_table_res_entry.offset +
- w->hdr.lookup_table_res_entry.size,
- write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS);
- if (ret != 0)
- return ret;
-
- off_t end_integrity = ftello(fp);
- if (end_integrity == -1)
- return WIMLIB_ERR_WRITE;
-
- off_t integrity_size = end_integrity - xml_end;
- w->hdr.integrity.size = integrity_size;
- w->hdr.integrity.original_size = integrity_size;
- w->hdr.integrity.flags = 0;
- }
- } else {
- DEBUG("Truncating file to end of XML data.");
- /* No integrity table to write. The file should be truncated
- * because it's possible that the old file was longer (due to it
- * including an integrity table, or due to its XML data being
- * longer) */
- if (fflush(fp) != 0) {
- ERROR_WITH_ERRNO("Failed to flush stream for file `%s'",
- w->filename);
- return WIMLIB_ERR_WRITE;
- }
- if (ftruncate(fileno(fp), xml_end) != 0) {
- ERROR_WITH_ERRNO("Failed to truncate `%s' to %"PRIu64" "
- "bytes", w->filename, xml_end);
- return WIMLIB_ERR_WRITE;
- }
- memset(&w->hdr.integrity, 0, sizeof(struct resource_entry));
- }
-
- DEBUG("Overwriting header.");
- /* Overwrite the header. */
- if (fseeko(fp, 0, SEEK_SET) != 0) {
- ERROR_WITH_ERRNO("Failed to seek to beginning of `%s'",
- w->filename);
- return WIMLIB_ERR_WRITE;
- }
-
- ret = write_header(&w->hdr, fp);
- if (ret != 0)
- return ret;
-
- DEBUG("Closing `%s'.", w->filename);
- if (fclose(fp) != 0) {
- ERROR_WITH_ERRNO("Failed to close `%s'", w->filename);
+ ret = ftruncate(fileno(fp), size);
+ if (ret != 0) {
+ ERROR_WITH_ERRNO("Failed to truncate output WIM file to "
+ "%"PRIu64" bytes", size);
return WIMLIB_ERR_WRITE;
}
- w->fp = NULL;
- DEBUG("Done.");
return 0;
-err:
- FREE(integrity_table);
- return ret;
}
-
/* 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.) */
return ret;
}
-typedef int (*compress_func_t)(const void *, unsigned, void *, unsigned *);
-
-compress_func_t get_compress_func(int out_ctype)
-{
- if (out_ctype == WIM_COMPRESSION_TYPE_LZX)
- return lzx_compress;
- else
- return xpress_compress;
-}
-
-
/*
- * Compresses a chunk of a WIM resource.
+ * Pointer to function to compresses a chunk of a WIM resource.
*
* @chunk: Uncompressed data of the chunk.
* @chunk_size: Size of the uncompressed chunk in 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)
+typedef int (*compress_func_t)(const void *, unsigned, void *, unsigned *);
+
+compress_func_t get_compress_func(int out_ctype)
{
- compress_func_t compress = get_compress_func(ctype);
- return (*compress)(chunk, chunk_size, compressed_chunk,
- compressed_chunk_len_ret);
+ if (out_ctype == WIM_COMPRESSION_TYPE_LZX)
+ return lzx_compress;
+ else
+ return xpress_compress;
}
/*
* 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,
+ FILE *out_fp, compress_func_t compress,
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 {
+ if (chunk_tab) {
u8 *compressed_chunk = alloca(chunk_size);
int ret;
- ret = compress_chunk(chunk, chunk_size, compressed_chunk,
- &out_chunk_size, out_ctype);
+ ret = compress(chunk, chunk_size, compressed_chunk,
+ &out_chunk_size);
if (ret == 0) {
out_chunk = compressed_chunk;
} else {
}
*chunk_tab->cur_offset_p++ = chunk_tab->cur_offset;
chunk_tab->cur_offset += out_chunk_size;
+ } else {
+ out_chunk = chunk;
+ out_chunk_size = 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;
}
+/* Prepare for multiple reads to a resource by caching a FILE * or NTFS
+ * attribute pointer in the lookup table entry. */
static int prepare_resource_for_read(struct lookup_table_entry *lte
#ifdef WITH_NTFS_3G
return 0;
}
+/* Undo prepare_resource_for_read() by closing the cached FILE * or NTFS
+ * attribute. */
static void end_wim_resource_read(struct lookup_table_entry *lte
#ifdef WITH_NTFS_3G
, ntfs_inode *ni
struct chunk_table *chunk_tab = NULL;
bool raw;
off_t file_offset;
+ compress_func_t compress;
#ifdef WITH_NTFS_3G
ntfs_inode *ni = NULL;
#endif
/* 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);
+ && out_ctype != WIM_COMPRESSION_TYPE_NONE
+ && !(flags & WIMLIB_RESOURCE_FLAG_RECOMPRESS));
if (raw) {
flags |= WIMLIB_RESOURCE_FLAG_RAW;
* hash given in the lookup table entry once we've finished reading the
* resource. */
SHA_CTX ctx;
- if (!raw)
+ if (!raw) {
sha1_init(&ctx);
+ compress = get_compress_func(out_ctype);
+ }
+ offset = 0;
/* 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 (!raw)
sha1_update(&ctx, buf, to_read);
ret = write_wim_resource_chunk(buf, to_read, out_fp,
- out_ctype, chunk_tab);
+ compress, chunk_tab);
if (ret != 0)
goto out_fclose;
bytes_remaining -= to_read;
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;
+
+ ret = fflush_and_ftruncate(out_fp, file_offset + out_res_entry->size);
+ if (ret != 0)
goto out_fclose;
- }
} else {
if (out_res_entry) {
out_res_entry->size = new_compressed_size;
return ret;
}
-
#ifdef ENABLE_MULTITHREADED_COMPRESSION
struct shared_queue {
sem_t filled_slots;
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;
u64 cur_size = 0;
u64 next_size = 0;
unsigned cur_percent = 0;
+ int write_resource_flags = 0;
+
+ if (write_flags & WIMLIB_WRITE_FLAG_RECOMPRESS)
+ write_resource_flags |= WIMLIB_RESOURCE_FLAG_RECOMPRESS;
list_for_each_entry(lte, stream_list, staging_list) {
if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS) {
&cur_percent, lte);
}
ret = write_wim_resource(lte, out_fp, out_ctype,
- <e->output_resource_entry, 0);
+ <e->output_resource_entry,
+ write_resource_flags);
if (ret != 0)
return ret;
}
if (fwrite(msg->out_compressed_chunks[i], 1, chunk_csize, out_fp)
!= chunk_csize)
{
- ERROR_WITH_ERRNO("Failed to write WIM");
+ ERROR_WITH_ERRNO("Failed to write WIM chunk");
return WIMLIB_ERR_WRITE;
}
{
int ret;
-
struct message msgs[queue_size];
ZERO_ARRAY(msgs);
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)
+ if ((!(write_flags & WIMLIB_WRITE_FLAG_RECOMPRESS)
+ && 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,
wimlib_assert(stream_list->next != stream_list);
-
static const double MESSAGES_PER_THREAD = 2.0;
size_t queue_size = (size_t)(num_threads * MESSAGES_PER_THREAD);
}
if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS) {
- printf("Writing %s compressed data using %u threads...\n",
+ printf("Writing %s data using %u threads...\n",
get_data_type(out_ctype), num_threads);
}
}
#endif
+/*
+ * Write a list of streams to a WIM (@out_fp) using the compression type
+ * @out_ctype and up to @num_threads compressor threads.
+ */
static int write_stream_list(struct list_head *stream_list, FILE *out_fp,
int out_ctype, int write_flags,
unsigned num_threads)
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)
+ &&
+ (out_ctype != WIM_COMPRESSION_TYPE_NONE
+ && (lte->resource_location != RESOURCE_IN_WIM
+ || wimlib_get_compression_type(lte->wim) != out_ctype
+ || (write_flags & WIMLIB_WRITE_FLAG_REBUILD)))
&& wim_resource_size(lte) != 0)
compression_needed = true;
}
+ if (num_streams == 0) {
+ if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE)
+ printf("No streams to write\n");
+ return 0;
+ }
+
if (write_flags & WIMLIB_WRITE_FLAG_VERBOSE) {
printf("Preparing to write %zu streams "
"(%"PRIu64" total bytes uncompressed)\n",
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);
+ list_add_tail(<e->staging_list, stream_list);
}
return 0;
}
unsigned num_threads)
{
+ for_lookup_table_entry(w->lookup_table, lte_zero_out_refcnt, NULL);
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,
}
/*
- * Write the lookup table, xml data, and integrity table, then overwrite the WIM
- * header.
+ * Finish writing a WIM file: write the lookup table, xml data, and integrity
+ * table (optional), then overwrite the WIM header.
+ *
+ * write_flags is a bitwise OR of the following:
+ *
+ * (public) WIMLIB_WRITE_FLAG_CHECK_INTEGRITY:
+ * Include an integrity table.
+ *
+ * (public) WIMLIB_WRITE_FLAG_SHOW_PROGRESS:
+ * Show progress information when (if) writing the integrity table.
+ *
+ * (private) WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE:
+ * Don't write the lookup table.
+ *
+ * (private) WIMLIB_WRITE_FLAG_REUSE_INTEGRITY_TABLE:
+ * When (if) writing the integrity table, re-use entries from the
+ * existing integrity table, if possible.
+ *
+ * (private) WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML:
+ * After writing the XML data but before writing the integrity
+ * table, write a temporary WIM header and flush the stream so that
+ * the WIM is less likely to become corrupted upon abrupt program
+ * termination.
+ *
+ * (private) WIMLIB_WRITE_FLAG_FSYNC:
+ * fsync() the output file before closing it.
+ *
*/
int finish_write(WIMStruct *w, int image, int write_flags)
{
- off_t lookup_table_offset;
- off_t xml_data_offset;
- off_t lookup_table_size;
- off_t integrity_offset;
- off_t xml_data_size;
- off_t end_offset;
- off_t integrity_size;
int ret;
struct wim_header hdr;
FILE *out = w->out_fp;
- if (!(write_flags & WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE)) {
- /* Write the lookup table. */
- lookup_table_offset = ftello(out);
- if (lookup_table_offset == -1)
- return WIMLIB_ERR_WRITE;
-
- DEBUG("Writing lookup table (offset %"PRIu64")",
- lookup_table_offset);
- ret = write_lookup_table(w->lookup_table, out);
- if (ret != 0)
- return ret;
- }
-
- xml_data_offset = ftello(out);
- if (xml_data_offset == -1)
- return WIMLIB_ERR_WRITE;
-
/* @hdr will be the header for the new WIM. First copy all the data
* from the header in the WIMStruct; then set all the fields that may
* have changed, including the resource entries, boot index, and image
* count. */
memcpy(&hdr, &w->hdr, sizeof(struct wim_header));
+
if (!(write_flags & WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE)) {
- lookup_table_size = xml_data_offset - lookup_table_offset;
- hdr.lookup_table_res_entry.offset = lookup_table_offset;
- hdr.lookup_table_res_entry.size = lookup_table_size;
+ ret = write_lookup_table(w->lookup_table, out, &hdr.lookup_table_res_entry);
+ if (ret != 0)
+ goto out;
}
- hdr.lookup_table_res_entry.original_size = hdr.lookup_table_res_entry.size;
- hdr.lookup_table_res_entry.flags = WIM_RESHDR_FLAG_METADATA;
- DEBUG("Writing XML data (offset %"PRIu64")", xml_data_offset);
ret = write_xml_data(w->wim_info, image, out,
(write_flags & WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE) ?
- wim_info_get_total_bytes(w->wim_info) : 0);
+ wim_info_get_total_bytes(w->wim_info) : 0,
+ &hdr.xml_res_entry);
if (ret != 0)
- return ret;
+ goto out;
- integrity_offset = ftello(out);
- if (integrity_offset == -1)
- return WIMLIB_ERR_WRITE;
- xml_data_size = integrity_offset - xml_data_offset;
+ if (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) {
+ if (write_flags & WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML) {
+ struct wim_header checkpoint_hdr;
+ memcpy(&checkpoint_hdr, &hdr, sizeof(struct wim_header));
+ memset(&checkpoint_hdr.integrity, 0, sizeof(struct resource_entry));
+ if (fseeko(out, 0, SEEK_SET) != 0) {
+ ret = WIMLIB_ERR_WRITE;
+ goto out;
+ }
+ ret = write_header(&checkpoint_hdr, out);
+ if (ret != 0)
+ goto out;
- hdr.xml_res_entry.offset = xml_data_offset;
- hdr.xml_res_entry.size = xml_data_size;
- hdr.xml_res_entry.original_size = xml_data_size;
- hdr.xml_res_entry.flags = 0;
+ if (fflush(out) != 0) {
+ ERROR_WITH_ERRNO("Can't write data to WIM");
+ ret = WIMLIB_ERR_WRITE;
+ goto out;
+ }
- if (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) {
- ret = write_integrity_table(out, WIM_HEADER_DISK_SIZE,
- xml_data_offset,
- write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS);
+ if (fseeko(out, 0, SEEK_END) != 0) {
+ ret = WIMLIB_ERR_WRITE;
+ goto out;
+ }
+ }
+
+ off_t old_lookup_table_end;
+ off_t new_lookup_table_end;
+ bool show_progress;
+ if (write_flags & WIMLIB_WRITE_FLAG_REUSE_INTEGRITY_TABLE) {
+ old_lookup_table_end = w->hdr.lookup_table_res_entry.offset +
+ w->hdr.lookup_table_res_entry.size;
+ } else {
+ old_lookup_table_end = 0;
+ }
+ new_lookup_table_end = hdr.lookup_table_res_entry.offset +
+ hdr.lookup_table_res_entry.size;
+ show_progress = ((write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS) != 0);
+
+ ret = write_integrity_table(out,
+ &hdr.integrity,
+ new_lookup_table_end,
+ old_lookup_table_end,
+ show_progress);
if (ret != 0)
- return ret;
- end_offset = ftello(out);
- if (end_offset == -1)
- return WIMLIB_ERR_WRITE;
- integrity_size = end_offset - integrity_offset;
- hdr.integrity.offset = integrity_offset;
- hdr.integrity.size = integrity_size;
- hdr.integrity.original_size = integrity_size;
+ goto out;
} else {
- hdr.integrity.offset = 0;
- hdr.integrity.size = 0;
- hdr.integrity.original_size = 0;
+ memset(&hdr.integrity, 0, sizeof(struct resource_entry));
}
- hdr.integrity.flags = 0;
-
- DEBUG("Updating WIM header.");
/*
* In the WIM header, there is room for the resource entry for a
hdr.boot_idx = 0;
}
-
- if (fseeko(out, 0, SEEK_SET) != 0)
- return WIMLIB_ERR_WRITE;
+ if (fseeko(out, 0, SEEK_SET) != 0) {
+ ret = WIMLIB_ERR_WRITE;
+ goto out;
+ }
ret = write_header(&hdr, out);
if (ret != 0)
- return ret;
+ goto out;
- DEBUG("Closing output file.");
- wimlib_assert(w->out_fp != NULL);
- if (fclose(w->out_fp) != 0) {
+ if (write_flags & WIMLIB_WRITE_FLAG_FSYNC) {
+ if (fflush(out) != 0
+ || fsync(fileno(out)) != 0)
+ {
+ ERROR_WITH_ERRNO("Error flushing data to WIM file");
+ ret = WIMLIB_ERR_WRITE;
+ }
+ }
+out:
+ if (fclose(out) != 0) {
ERROR_WITH_ERRNO("Failed to close the WIM file");
- ret = WIMLIB_ERR_WRITE;
+ if (ret == 0)
+ ret = WIMLIB_ERR_WRITE;
}
w->out_fp = NULL;
return ret;
}
+static void close_wim_writable(WIMStruct *w)
+{
+ if (w->out_fp) {
+ if (fclose(w->out_fp) != 0) {
+ WARNING("Failed to close output WIM: %s",
+ strerror(errno));
+ }
+ w->out_fp = NULL;
+ }
+}
+
/* Open file stream and write dummy header for WIM. */
int begin_write(WIMStruct *w, const char *path, int write_flags)
{
- const char *mode;
- DEBUG("Opening `%s' for new WIM", path);
-
- /* checking the integrity requires going back over the file to read it.
- * XXX
- * (It also would be possible to keep a running sha1sum as the file is
- * written-- this would be faster, but a bit more complicated) */
+ int ret;
+ bool need_readable = false;
+ bool trunc = true;
if (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY)
- mode = "w+b";
- else
- mode = "wb";
-
- if (w->out_fp)
- fclose(w->out_fp);
-
- w->out_fp = fopen(path, mode);
- if (!w->out_fp) {
- ERROR_WITH_ERRNO("Failed to open the file `%s' for writing",
- path);
- return WIMLIB_ERR_OPEN;
- }
+ need_readable = true;
+ ret = open_wim_writable(w, path, trunc, need_readable);
+ if (ret != 0)
+ return ret;
/* Write dummy header. It will be overwritten later. */
return write_header(&w->hdr, w->out_fp);
}
if (!w || !path)
return WIMLIB_ERR_INVALID_PARAM;
- write_flags &= ~WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE;
+ write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
if (image != WIM_ALL_IMAGES &&
(image < 1 || image > w->hdr.image_count))
return WIMLIB_ERR_INVALID_IMAGE;
-
if (w->hdr.total_parts != 1) {
ERROR("Cannot call wimlib_write() on part of a split WIM");
return WIMLIB_ERR_SPLIT_UNSUPPORTED;
ret = begin_write(w, path, write_flags);
if (ret != 0)
- return ret;
-
- for_lookup_table_entry(w->lookup_table, lte_zero_out_refcnt, NULL);
+ goto out;
ret = write_wim_streams(w, image, write_flags, num_threads);
-
- if (ret != 0) {
- /*ERROR("Failed to write WIM file resources to `%s'", path);*/
- return ret;
- }
+ if (ret != 0)
+ goto out;
if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS)
printf("Writing image metadata...\n");
ret = for_image(w, image, write_metadata_resource);
+ if (ret != 0)
+ goto out;
- if (ret != 0) {
- /*ERROR("Failed to write WIM image metadata to `%s'", path);*/
+ ret = finish_write(w, image, write_flags);
+ if (ret == 0 && (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS))
+ printf("Successfully wrote `%s'\n", path);
+out:
+ close_wim_writable(w);
+ return ret;
+}
+
+static int lte_overwrite_prepare(struct lookup_table_entry *lte,
+ void *ignore)
+{
+ memcpy(<e->output_resource_entry, <e->resource_entry,
+ sizeof(struct resource_entry));
+ lte->out_refcnt = 0;
+ return 0;
+}
+
+static int check_resource_offset(struct lookup_table_entry *lte, void *arg)
+{
+ off_t end_offset = *(u64*)arg;
+
+ wimlib_assert(lte->out_refcnt <= lte->refcnt);
+ if (lte->out_refcnt < lte->refcnt) {
+ if (lte->resource_entry.offset + lte->resource_entry.size > end_offset) {
+ ERROR("The following resource is after the XML data:");
+ print_lookup_table_entry(lte);
+ return WIMLIB_ERR_RESOURCE_ORDER;
+ }
+ }
+ return 0;
+}
+
+static int find_new_streams(struct lookup_table_entry *lte, void *arg)
+{
+ if (lte->out_refcnt == lte->refcnt)
+ list_add(<e->staging_list, (struct list_head*)arg);
+ else
+ lte->out_refcnt = lte->refcnt;
+ return 0;
+}
+
+/*
+ * Overwrite a WIM, possibly appending streams to it.
+ *
+ * A WIM looks like (or is supposed to look like) the following:
+ *
+ * Header (212 bytes)
+ * Streams and metadata resources (variable size)
+ * Lookup table (variable size)
+ * XML data (variable size)
+ * Integrity table (optional) (variable size)
+ *
+ * If we are not adding any streams or metadata resources, the lookup table is
+ * unchanged--- so we only need to overwrite the XML data, integrity table, and
+ * header. This operation is potentially unsafe if the program is abruptly
+ * terminated while the XML data or integrity table are being overwritten, but
+ * before the new header has been written. To partially alleviate this problem,
+ * a special flag (WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML) is passed to
+ * finish_write() to cause a temporary WIM header to be written after the XML
+ * data has been written. This may prevent the WIM from becoming corrupted if
+ * the program is terminated while the integrity table is being calculated (but
+ * no guarantees, due to write re-ordering...).
+ *
+ * If we are adding new streams or images (metadata resources), the lookup table
+ * needs to be changed, and those streams need to be written. In this case, we
+ * try to perform a safe update of the WIM file by writing the streams *after*
+ * the end of the previous WIM, then writing the new lookup table, XML data, and
+ * (optionally) integrity table following the new streams. This will produce a
+ * layout like the following:
+ *
+ * Header (212 bytes)
+ * (OLD) Streams and metadata resources (variable size)
+ * (OLD) Lookup table (variable size)
+ * (OLD) XML data (variable size)
+ * (OLD) Integrity table (optional) (variable size)
+ * (NEW) Streams and metadata resources (variable size)
+ * (NEW) Lookup table (variable size)
+ * (NEW) XML data (variable size)
+ * (NEW) Integrity table (optional) (variable size)
+ *
+ * At all points, the WIM is valid as nothing points to the new data yet. Then,
+ * the header is overwritten to point to the new lookup table, XML data, and
+ * integrity table, to produce the following layout:
+ *
+ * Header (212 bytes)
+ * Streams and metadata resources (variable size)
+ * Nothing (variable size)
+ * More Streams and metadata resources (variable size)
+ * Lookup table (variable size)
+ * XML data (variable size)
+ * Integrity table (optional) (variable size)
+ *
+ * This method allows an image to be appended to a large WIM very quickly, and
+ * is is crash-safe except in the case of write re-ordering, but the
+ * disadvantage is that a small hole is left in the WIM where the old lookup
+ * table, xml data, and integrity table were. (These usually only take up a
+ * small amount of space compared to the streams, however.
+ */
+static int overwrite_wim_inplace(WIMStruct *w, int write_flags,
+ unsigned num_threads,
+ int modified_image_idx)
+{
+ int ret;
+ struct list_head stream_list;
+ off_t old_wim_end;
+
+ DEBUG("Overwriting `%s' in-place", w->filename);
+
+ /* 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
+ * overwritten. */
+ if (w->hdr.integrity.offset != 0 &&
+ w->hdr.integrity.offset < w->hdr.xml_res_entry.offset) {
+ ERROR("Didn't expect the integrity table to be before the XML data");
+ return WIMLIB_ERR_RESOURCE_ORDER;
+ }
+
+ if (w->hdr.lookup_table_res_entry.offset > w->hdr.xml_res_entry.offset) {
+ ERROR("Didn't expect the lookup table to be after the XML data");
+ return WIMLIB_ERR_RESOURCE_ORDER;
+ }
+
+ DEBUG("Identifying newly added streams");
+ for_lookup_table_entry(w->lookup_table, lte_overwrite_prepare, NULL);
+ INIT_LIST_HEAD(&stream_list);
+ for (int i = modified_image_idx; i < w->hdr.image_count; i++) {
+ DEBUG("Identifiying streams in image %d", i + 1);
+ wimlib_assert(w->image_metadata[i].modified);
+ wimlib_assert(!w->image_metadata[i].has_been_mounted_rw);
+ wimlib_assert(w->image_metadata[i].root_dentry != NULL);
+ wimlib_assert(w->image_metadata[i].metadata_lte != NULL);
+ w->private = &stream_list;
+ for_dentry_in_tree(w->image_metadata[i].root_dentry,
+ dentry_find_streams_to_write, w);
+ }
+
+ if (w->hdr.integrity.offset)
+ old_wim_end = w->hdr.integrity.offset + w->hdr.integrity.size;
+ else
+ old_wim_end = w->hdr.xml_res_entry.offset + w->hdr.xml_res_entry.size;
+
+ ret = for_lookup_table_entry(w->lookup_table, check_resource_offset,
+ &old_wim_end);
+ if (ret != 0)
return ret;
+
+ if (modified_image_idx == w->hdr.image_count && !w->deletion_occurred) {
+ /* If no images have been modified and no images have been
+ * deleted, a new lookup table does not need to be written. */
+ wimlib_assert(list_empty(&stream_list));
+ old_wim_end = w->hdr.lookup_table_res_entry.offset +
+ w->hdr.lookup_table_res_entry.size;
+ write_flags |= WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE |
+ WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML;
}
- ret = finish_write(w, image, write_flags);
+ INIT_LIST_HEAD(&stream_list);
+ for_lookup_table_entry(w->lookup_table, find_new_streams,
+ &stream_list);
+
+ ret = open_wim_writable(w, w->filename, false,
+ (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) != 0);
if (ret != 0)
return ret;
+ if (fseeko(w->out_fp, old_wim_end, SEEK_SET) != 0) {
+ ERROR_WITH_ERRNO("Can't seek to end of WIM");
+ return WIMLIB_ERR_WRITE;
+ }
+
+ if (!list_empty(&stream_list)) {
+ DEBUG("Writing newly added streams (offset = %"PRIu64")",
+ old_wim_end);
+ ret = write_stream_list(&stream_list, w->out_fp,
+ wimlib_get_compression_type(w),
+ write_flags, num_threads);
+ if (ret != 0)
+ goto out_ftruncate;
+ } else {
+ DEBUG("No new streams were added");
+ }
+
+ for (int i = modified_image_idx; i < w->hdr.image_count; i++) {
+ select_wim_image(w, i + 1);
+ ret = write_metadata_resource(w);
+ if (ret != 0)
+ goto out_ftruncate;
+ }
+ write_flags |= WIMLIB_WRITE_FLAG_REUSE_INTEGRITY_TABLE;
+ ret = finish_write(w, WIM_ALL_IMAGES, write_flags);
+out_ftruncate:
+ close_wim_writable(w);
+ if (ret != 0) {
+ WARNING("Truncating `%s' to its original size (%"PRIu64" bytes)",
+ w->filename, old_wim_end);
+ truncate(w->filename, old_wim_end);
+ }
+ return ret;
+}
+
+static int overwrite_wim_via_tmpfile(WIMStruct *w, int write_flags,
+ unsigned num_threads)
+{
+ size_t wim_name_len;
+ int ret;
+
+ DEBUG("Overwrining `%s' via a temporary file", w->filename);
+
+ /* Write the WIM to a temporary file in the same directory as the
+ * original WIM. */
+ wim_name_len = strlen(w->filename);
+ char tmpfile[wim_name_len + 10];
+ memcpy(tmpfile, w->filename, wim_name_len);
+ randomize_char_array_with_alnum(tmpfile + wim_name_len, 9);
+ tmpfile[wim_name_len + 9] = '\0';
+
+ ret = wimlib_write(w, tmpfile, WIM_ALL_IMAGES,
+ write_flags | WIMLIB_WRITE_FLAG_FSYNC,
+ num_threads);
+ if (ret != 0) {
+ ERROR("Failed to write the WIM file `%s'", tmpfile);
+ goto err;
+ }
+
+ /* Close the original WIM file that was opened for reading. */
+ if (w->fp != NULL) {
+ fclose(w->fp);
+ w->fp = NULL;
+ }
+
+ DEBUG("Renaming `%s' to `%s'", tmpfile, w->filename);
+
+ /* Rename the new file to the old file .*/
+ if (rename(tmpfile, w->filename) != 0) {
+ ERROR_WITH_ERRNO("Failed to rename `%s' to `%s'",
+ tmpfile, w->filename);
+ ret = WIMLIB_ERR_RENAME;
+ goto err;
+ }
+
if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS)
- printf("Successfully wrote `%s'\n", path);
- return 0;
+ printf("Successfully renamed `%s' to `%s'\n", tmpfile, w->filename);
+
+ /* Re-open the WIM read-only. */
+ w->fp = fopen(w->filename, "rb");
+ if (w->fp == NULL) {
+ ret = WIMLIB_ERR_REOPEN;
+ WARNING("Failed to re-open `%s' read-only: %s",
+ w->filename, strerror(errno));
+ }
+ return ret;
+err:
+ /* Remove temporary file. */
+ if (unlink(tmpfile) != 0)
+ WARNING("Failed to remove `%s': %s", tmpfile, strerror(errno));
+ return ret;
+}
+
+/*
+ * Writes a WIM file to the original file that it was read from, overwriting it.
+ */
+WIMLIBAPI int wimlib_overwrite(WIMStruct *w, int write_flags,
+ unsigned num_threads)
+{
+ if (!w)
+ return WIMLIB_ERR_INVALID_PARAM;
+
+ write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
+
+ if (!w->filename)
+ return WIMLIB_ERR_NO_FILENAME;
+
+ if (w->hdr.total_parts != 1) {
+ ERROR("Cannot modify a split WIM");
+ return WIMLIB_ERR_SPLIT_UNSUPPORTED;
+ }
+
+ if ((!w->deletion_occurred || (write_flags & WIMLIB_WRITE_FLAG_SOFT_DELETE))
+ && !(write_flags & WIMLIB_WRITE_FLAG_REBUILD))
+ {
+ int i, modified_image_idx;
+ for (i = 0; i < w->hdr.image_count && !w->image_metadata[i].modified; i++)
+ ;
+ modified_image_idx = i;
+ for (; i < w->hdr.image_count && w->image_metadata[i].modified &&
+ !w->image_metadata[i].has_been_mounted_rw; i++)
+ ;
+ if (i == w->hdr.image_count) {
+ return overwrite_wim_inplace(w, write_flags, num_threads,
+ modified_image_idx);
+ }
+ }
+ return overwrite_wim_via_tmpfile(w, write_flags, num_threads);
+}
+
+/* Deprecated */
+WIMLIBAPI int wimlib_overwrite_xml_and_header(WIMStruct *wim, int write_flags)
+{
+ return wimlib_overwrite(wim, write_flags, 1);
}
git://wimlib.net / wimlib / blobdiff