/**
* ubifs_run_commit - run or wait for commit.
* @c: UBIFS file-system description object
*
* This function runs commit and returns zero in case of success and a negative
* error code in case of failure.
*/
int ubifs_run_commit(struct ubifs_info *c)
{
int err = 0;
spin_lock(&c->cs_lock);
if (c->cmt_state == COMMIT_BROKEN) {
err = -EINVAL;
goto out;
}
if (c->cmt_state == COMMIT_RUNNING_BACKGROUND)
/*
* We set the commit state to 'running required' to indicate
* that we want it to complete as quickly as possible.
*/
c->cmt_state = COMMIT_RUNNING_REQUIRED;
if (c->cmt_state == COMMIT_RUNNING_REQUIRED) {
spin_unlock(&c->cs_lock);
return wait_for_commit(c);
}
spin_unlock(&c->cs_lock);
/* Ok, the commit is indeed needed */
down_write(&c->commit_sem);
spin_lock(&c->cs_lock);
/*
* Since we unlocked 'c->cs_lock', the state may have changed, so
* re-check it.
*/
if (c->cmt_state == COMMIT_BROKEN) {
err = -EINVAL;
goto out_cmt_unlock;
}
if (c->cmt_state == COMMIT_RUNNING_BACKGROUND)
c->cmt_state = COMMIT_RUNNING_REQUIRED;
if (c->cmt_state == COMMIT_RUNNING_REQUIRED) {
up_write(&c->commit_sem);
spin_unlock(&c->cs_lock);
return wait_for_commit(c);
}
c->cmt_state = COMMIT_RUNNING_REQUIRED;
spin_unlock(&c->cs_lock);
err = do_commit(c);
return err;
out_cmt_unlock:
up_write(&c->commit_sem);
out:
spin_unlock(&c->cs_lock);
return err;
}
static int sync_current_delta(struct sb *sb, enum unify_flags unify_flag)
{
struct delta_ref *delta_ref;
unsigned delta;
int err = 0;
#if TUX3_FLUSHER == TUX3_FLUSHER_SYNC
down_write(&sb->delta_lock);
#endif
/* Get delta that have to write */
delta_ref = delta_get(sb);
#ifdef UNIFY_DEBUG
delta_ref->unify_flag = unify_flag;
#endif
delta = delta_ref->delta;
delta_put(sb, delta_ref);
trace("delta %u", delta);
/* Make sure the delta transition was done for current delta */
err = wait_for_transition(sb, delta);
if (err)
return err;
assert(delta_after_eq(sb->staging_delta, delta));
/* Wait until committing the current delta */
err = wait_for_commit(sb, delta);
assert(err || delta_after_eq(sb->committed_delta, delta));
#if TUX3_FLUSHER == TUX3_FLUSHER_SYNC
up_write(&sb->delta_lock);
#endif
return err;
}
static int cmd_subvol_delete(int argc, char **argv)
{
int res, e, ret = 0;
int cnt;
int fd = -1;
struct btrfs_ioctl_vol_args args;
char *dname, *vname, *cpath;
char *dupdname = NULL;
char *dupvname = NULL;
char *path;
DIR *dirstream = NULL;
int verbose = 0;
int commit_mode = 0;
optind = 1;
while (1) {
int c;
static const struct option long_options[] = {
{"commit-after", no_argument, NULL, 'c'}, /* commit mode 1 */
{"commit-each", no_argument, NULL, 'C'}, /* commit mode 2 */
{NULL, 0, NULL, 0}
};
c = getopt_long(argc, argv, "cC", long_options, NULL);
if (c < 0)
break;
switch(c) {
case 'c':
commit_mode = 1;
break;
case 'C':
commit_mode = 2;
break;
case 'v':
verbose++;
break;
default:
usage(cmd_subvol_delete_usage);
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_subvol_delete_usage);
if (verbose > 0) {
printf("Transaction commit: %s\n",
!commit_mode ? "none (default)" :
commit_mode == 1 ? "at the end" : "after each");
}
cnt = optind;
again:
path = argv[cnt];
res = test_issubvolume(path);
if (res < 0) {
fprintf(stderr, "ERROR: error accessing '%s'\n", path);
ret = 1;
goto out;
}
if (!res) {
fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
ret = 1;
goto out;
}
cpath = realpath(path, NULL);
if (!cpath) {
ret = errno;
fprintf(stderr, "ERROR: finding real path for '%s': %s\n",
path, strerror(errno));
goto out;
}
dupdname = strdup(cpath);
dname = dirname(dupdname);
dupvname = strdup(cpath);
vname = basename(dupvname);
free(cpath);
fd = open_file_or_dir(dname, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", dname);
ret = 1;
goto out;
}
printf("Delete subvolume (%s): '%s/%s'\n",
commit_mode == 2 || (commit_mode == 1 && cnt + 1 == argc)
? "commit" : "no-commit", dname, vname);
memset(&args, 0, sizeof(args));
strncpy_null(args.name, vname);
res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
e = errno;
if(res < 0 ){
fprintf( stderr, "ERROR: cannot delete '%s/%s' - %s\n",
dname, vname, strerror(e));
ret = 1;
goto out;
}
if (commit_mode == 1) {
res = wait_for_commit(fd);
if (res < 0) {
fprintf(stderr,
"ERROR: unable to wait for commit after '%s': %s\n",
path, strerror(errno));
ret = 1;
}
}
out:
free(dupdname);
free(dupvname);
dupdname = NULL;
dupvname = NULL;
cnt++;
if (cnt < argc) {
close_file_or_dir(fd, dirstream);
/* avoid double free */
fd = -1;
dirstream = NULL;
goto again;
}
if (commit_mode == 2 && fd != -1) {
res = wait_for_commit(fd);
if (res < 0) {
fprintf(stderr,
"ERROR: unable to do final sync: %s\n",
strerror(errno));
ret = 1;
}
}
close_file_or_dir(fd, dirstream);
return ret;
}
