/* Read from the file NODE for user CRED starting at OFFSET and continuing for
up to *LEN bytes. Put the data at DATA. Set *LEN to the amount
successfully read upon return. */
error_t netfs_attempt_read (struct iouser *cred, struct node *node,
off_t offset, size_t *len, void *data)
{
error_t err = 0;
if (! node->nn->contents)
err = ccache_create (node, &node->nn->contents);
if (! err)
{
if (*len > node->nn_stat.st_size - offset)
*len = node->nn_stat.st_size - offset;
if (*len > 0)
err = ccache_read (node->nn->contents, offset, *len, data);
}
return err;
}
void
tarsnap_mode_c(struct bsdtar *bsdtar)
{
struct archive *a;
size_t i;
if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
bsdtar_errc(bsdtar, 1, 0, "no files or directories specified");
for (i = 0; bsdtar->argv[i] != NULL; i++) {
if (bsdtar->argv[i][0] == '-' && bsdtar->argv[i][1] == '-') {
bsdtar_warnc(bsdtar, 0,
"List of objects to archive includes '%s'."
" This might not be what you intended.",
bsdtar->argv[i]);
break;
}
}
a = archive_write_new();
/* We only support the pax restricted format. */
archive_write_set_format_pax_restricted(a);
/* Set the block size to zero -- we don't want buffering. */
archive_write_set_bytes_per_block(a, 0);
/* Open the archive, keeping a cookie for talking to the tape layer. */
bsdtar->write_cookie = archive_write_open_multitape(a,
bsdtar->machinenum, bsdtar->cachedir, bsdtar->tapenames[0],
bsdtar->argc_orig, bsdtar->argv_orig,
bsdtar->option_print_stats, bsdtar->option_dryrun,
bsdtar->creationtime);
if (bsdtar->write_cookie == NULL)
bsdtar_errc(bsdtar, 1, 0, "%s", archive_error_string(a));
/*
* Remember the device and inode numbers of the cache directory, so
* that we can skip is in write_hierarchy().
*/
if (getdevino(a, bsdtar->cachedir,
&bsdtar->cachedir_dev, &bsdtar->cachedir_ino))
bsdtar_errc(bsdtar, 1, 0, "%s", archive_error_string(a));
/* If the chunkification cache is enabled, read it. */
if ((bsdtar->cachecrunch < 2) && (bsdtar->cachedir != NULL)) {
bsdtar->chunk_cache = ccache_read(bsdtar->cachedir);
if (bsdtar->chunk_cache == NULL)
bsdtar_errc(bsdtar, 1, errno, "Error reading cache");
}
write_archive(a, bsdtar);
/*
* If this isn't a dry run and we're running with the chunkification
* cache enabled, write the cache back to disk.
*/
if ((bsdtar->option_dryrun == 0) && (bsdtar->cachecrunch < 2)) {
if (ccache_write(bsdtar->chunk_cache, bsdtar->cachedir))
bsdtar_errc(bsdtar, 1, errno, "Error writing cache");
}
/* Free the chunkification cache. */
if (bsdtar->cachecrunch < 2)
ccache_free(bsdtar->chunk_cache);
}