/*
* called from qmp_migrate_set_cache_size in main thread, possibly while
* a migration is in progress.
* A running migration maybe using the cache and might finish during this
* call, hence changes to the cache are protected by XBZRLE.lock().
*/
int64_t xbzrle_cache_resize(int64_t new_size)
{
PageCache *new_cache;
int64_t ret;
if (new_size < TARGET_PAGE_SIZE) {
return -1;
}
XBZRLE_cache_lock();
if (XBZRLE.cache != NULL) {
if (pow2floor(new_size) == migrate_xbzrle_cache_size()) {
goto out_new_size;
}
new_cache = cache_init(new_size / TARGET_PAGE_SIZE,
TARGET_PAGE_SIZE);
if (!new_cache) {
error_report("Error creating cache");
ret = -1;
goto out;
}
cache_fini(XBZRLE.cache);
XBZRLE.cache = new_cache;
}
out_new_size:
ret = pow2floor(new_size);
out:
XBZRLE_cache_unlock();
return ret;
}
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
int res, nb, fd;
FILE *f;
/* initialise cache system */
if (!wget_init()) {
fprintf(stderr, "Failed to initialize CURL library. Abort.\n");
exit(3);
}
if (!cache_init()) {
fprintf(stderr, "Failed to initialize cache system. Abort.\n");
exit(3);
}
res = fuse_opt_parse(&args, &mo, rofs_opts, rofs_parse_opt);
if (res != 0)
{
fprintf(stderr, "Invalid arguments\n");
fprintf(stderr, "see `%s -h' for usage\n", argv[0]);
exit(1);
}
/* copy args in local */
if (mo.path == NULL) {
fprintf(stderr, "Missing URL. See -h for help.\n");
exit(1);
}
/* if mo.metadata == NULL, keep default value */
url_path = strdup(mo.path);
if (mo.metadata != NULL)
url_metadata = strdup(mo.metadata);
if ((url_path == NULL)||(url_metadata == NULL)) {
fprintf(stderr, "Internal error while copying options. Abort.\n");
exit(1);
}
if ((mo.chunks > 0)&&(mo.chunks <= CACHE_MAX_CHUNK)) {
cache_chunks = mo.chunks;
} else {
if ((mo.chunks < 0)&&(mo.chunks > CACHE_MAX_CHUNK)) {
fprintf(stderr, "Invalid number of chunks '%d' (allowed: 1-%d)\n",
mo.chunks, CACHE_MAX_CHUNK);
exit(1);
}
}
if (mo.chunksize >= 512) {
cache_chunksize = mo.chunksize;
} else {
if (mo.chunksize > 0) {
fprintf(stderr, "Chunk size '%d' too small (min: 512).\n", mo.chunksize);
exit(1);
}
}
/* check: if using a updater program for metadata file,
this one must be set with --metafile */
if ((url_metadata[0] == '@')&&(mo.metafile == NULL)) {
fprintf(stderr, "Problem: you set a updater program name, but you\n"
"did not set a name for the local metafil (--metafile option), so\n"
"you program has no way to know which file to update.\n"
"Abort.\n");
exit(8);
}
/* temp file to get the metadata for filesystem */
/* does user gives a metafile name? */
tpl[0] = '\0';
if (mo.metafile != NULL) {
strcat(tpl, mo.metafile);
} else {
strcat(tpl, "/tmp/webfsdesc.XXXXXX");
fd = mkstemp(tpl);
if (fd < 0) {
fprintf(stderr, "Failed to create temporaty file.\n");
exit(5);
}
close(fd); /* we use a FILE, not a fd */
}
/* build URL of metadata */
metaurl[0] = '\0';
/* special case: if url_metadata starts by @ it is the
name of the program to use to update the code */
if (url_metadata[0] == '@') {
strcat(metaurl, url_metadata);
} else {
strcat(metaurl, wget_encode(url_path, url_metadata));
}
if (!load_metadata()) {
fprintf(stderr, "Failed to download metadata file.\n");
exit(5);
}
/* load metadata to create FS tree */
f = fopen(tpl, "r");
if (f == NULL) {
fprintf(stderr, "Failed to open description file. Abort.\n");
exit(9);
}
nb = tree_create(f);
if (nb <= 0) {
/* this is an error */
fprintf(stderr, "Error while loading filesystem description. Abort.\n");
exit(1);
}
printf("%d entries added in FS tree.\n", nb);
tree_print();
fclose(f);
update_ok = UP_OK;
update_nbent = nb;
printf("Info: chunksize: %d, #chunks: %d\n", cache_chunksize, cache_chunks);
/* only for fuse 26. else remove the final NULL */
fuse_main(args.argc, args.argv, &callback_oper, NULL);
/* terminate everythings */
tree_free();
cache_fini();
wget_fini();
/* remove temp file */
if (url_metadata[0] != '@') /* do not remove in this case */
unlink((const char *)tpl);
return(0);
}
