Below you can see the patch related to command implementation Goffredo
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
new file mode 100644
index 0000000..e112902
--- /dev/null
+++ b/btrfs_cmds.c
@@ -0,0 +1,647 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <limits.h>
+#include <uuid/uuid.h>
+
+#undef ULONG_MAX
+
+#include "kerncompat.h"
+#include "ctree.h"
+#include "transaction.h"
+#include "utils.h"
+#include "version.h"
+#include "ioctl.h"
+#include "volumes.h"
+
+#include "btrfs_cmds.h"
+
+#ifdef __CHECKER__
+#define BLKGETSIZE64 0
+#define BTRFS_IOC_SNAP_CREATE 0
+#define BTRFS_VOL_NAME_MAX 255
+struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
+static inline int ioctl(int fd, int define, void *arg) { return 0; }
+#endif
+
+/*
+ * test if path is a subvolume:
+ * this function return
+ * 0-> path exists but it is not a subvolume
+ * 1-> path exists and it is a subvolume
+ * -1 -> path is unaccessible
+ */
+static int test_issubvolume(char *path)
+{
+
+ struct stat st;
+ int res;
+
+ res = stat(path, &st);
+ if(res < 0 )
+ return -1;
+
+ return (st.st_ino == 256) && S_ISDIR(st.st_mode);
+
+}
+
+/*
+ * test if path is a directory
+ * this function return
+ * 0-> path exists but it is not a directory
+ * 1-> path exists and it is a directory
+ * -1 -> path is unaccessible
+ */
+static int test_isdir(char *path)
+{
+ struct stat st;
+ int res;
+
+ res = stat(path, &st);
+ if(res < 0 )
+ return -1;
+
+ return S_ISDIR(st.st_mode);
+
+}
+
+static int open_file_or_dir(const char *fname)
+{
+ int ret;
+ struct stat st;
+ DIR *dirstream;
+ int fd;
+
+ ret = stat(fname, &st);
+ if (ret < 0) {
+ return -1;
+ }
+ if (S_ISDIR(st.st_mode)) {
+ dirstream = opendir(fname);
+ if (!dirstream) {
+ return -2;
+ }
+ fd = dirfd(dirstream);
+ } else {
+ fd = open(fname, O_RDWR);
+ }
+ if (fd < 0) {
+ return -3;
+ }
+ return fd;
+}
+
+int do_clone(int argc, char **argv)
+{
+ char *subvol, *dst;
+ int res, fd, fddst, len;
+ char *newname;
+ char *dstdir;
+
+ subvol = argv[0];
+ dst = argv[1];
+ struct btrfs_ioctl_vol_args args;
+
+ res = test_issubvolume(subvol);
+ if(res<0){
+ fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
+ return 12;
+ }
+ if(!res){
+ fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
+ return 13;
+ }
+
+ res = test_isdir(dst);
+ if(res == 0 ){
+ fprintf(stderr, "ERROR: '%s' exists and it is not a
directory\n", dst);
+ return 12;
+ }
+
+ if(res>0){
+ newname = strdup(subvol);
+ newname = basename(newname);
+ dstdir = dst;
+ }else{
+ newname = strdup(dst);
+ newname = basename(newname);
+ dstdir = strdup(dst);
+ dstdir = dirname(dstdir);
+ }
+
+ if( !strcmp(newname,".") || !strcmp(newname,"..") ||
+ strchr(newname, '/') ){
+ fprintf(stderr, "ERROR: uncorrect snapshot name ('%s')\n",
+ newname);
+ return 14;
+ }
+
+ len = strlen(newname);
+ if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
+ fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
+ newname);
+ return 14;
+ }
+
+ fddst = open_file_or_dir(dstdir);
+ if (fddst < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
+ return 12;
+ }
+
+ fd = open_file_or_dir(subvol);
+ if (fd < 0) {
+ close(fddst);
+ fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
+ return 12;
+ }
+
+ printf("Create a snapshot of '%s' in '%s/%s'\n",
+ subvol, dstdir, newname);
+ args.fd = fd;
+ strcpy(args.name, newname);
+ res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE, &args);
+
+ close(fd);
+ close(fddst);
+
+ if(res < 0 ){
+ fprintf( stderr, "ERROR: cannot snapshot '%s'\n",subvol);
+ return 11;
+ }
+
+ return 0;
+
+}
+
+int do_delete_subvolume(int argc, char **argv)
+{
+ int res, fd, len;
+ struct btrfs_ioctl_vol_args args;
+ char *dname, *vname, *cpath;
+ char *path = argv[0];
+
+ res = test_issubvolume(path);
+ if(res<0){
+ fprintf(stderr, "ERROR: error accessing '%s'\n", path);
+ return 12;
+ }
+ if(!res){
+ fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
+ return 13;
+ }
+
+ cpath = realpath(path, 0);
+ dname = strdup(cpath);
+ dname = dirname(dname);
+ vname = strdup(cpath);
+ vname = basename(vname);
+ free(cpath);
+
+ if( !strcmp(vname,".") || !strcmp(vname,"..") ||
+ strchr(vname, '/') ){
+ fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
+ vname);
+ return 14;
+ }
+
+ len = strlen(vname);
+ if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
+ fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
+ vname);
+ return 14;
+ }
+
+ fd = open_file_or_dir(dname);
+ if (fd < 0) {
+ close(fd);
+ fprintf(stderr, "ERROR: can't access to '%s'\n", dname);
+ return 12;
+ }
+
+ printf("Delete subvolume '%s/%s'\n", dname, vname);
+ strcpy(args.name, vname);
+ res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
+
+ close(fd);
+
+ if(res < 0 ){
+ fprintf( stderr, "ERROR: cannot delete '%s/%s'\n",dname,
vname);
+ return 11;
+ }
+
+ return 0;
+
+}
+
+int do_create_subvol(int argc, char **argv)
+{
+ int res, fddst, len;
+ char *newname;
+ char *dstdir;
+ struct btrfs_ioctl_vol_args args;
+ char *dst = argv[0];
+
+ res = test_isdir(dst);
+ if(res >= 0 ){
+ fprintf(stderr, "ERROR: '%s' exists\n", dst);
+ return 12;
+ }
+
+ newname = strdup(dst);
+ newname = basename(newname);
+ dstdir = strdup(dst);
+ dstdir = dirname(dstdir);
+
+ if( !strcmp(newname,".") || !strcmp(newname,"..") ||
+ strchr(newname, '/') ){
+ fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
+ newname);
+ return 14;
+ }
+
+ len = strlen(newname);
+ if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
+ fprintf(stderr, "ERROR: subvolume name too long ('%s)\n",
+ newname);
+ return 14;
+ }
+
+ fddst = open_file_or_dir(dstdir);
+ if (fddst < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
+ return 12;
+ }
+
+ printf("Create subvolume '%s/%s'\n", dstdir, newname);
+ strcpy(args.name, newname);
+ res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
+
+ close(fddst);
+
+ if(res < 0 ){
+ fprintf( stderr, "ERROR: cannot create subvolume\n");
+ return 11;
+ }
+
+ return 0;
+
+}
+
+int do_fssync(int argc, char **argv)
+{
+ int fd, res;
+ char *path = argv[0];
+
+ fd = open_file_or_dir(path);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", path);
+ return 12;
+ }
+
+ printf("FSSync '%s'\n", path);
+ res = ioctl(fd, BTRFS_IOC_SYNC);
+ close(fd);
+ if( res < 0 ){
+ fprintf(stderr, "ERROR: unable to fs-syncing '%s'\n", path);
+ return 16;
+ }
+
+ return 0;
+}
+
+int do_scan(int nargs, char **argv)
+{
+ int i, fd;
+ if(!nargs){
+ int ret;
+
+ printf("Scanning for Btrfs filesystems\n");
+ ret = btrfs_scan_one_dir("/dev", 1);
+ if (ret){
+ fprintf(stderr, "ERROR: error %d while scanning\n",
ret);
+ return 18;
+ }
+ return 0;
+ }
+
+ fd = open("/dev/btrfs-control", O_RDWR);
+ if (fd < 0) {
+ perror("failed to open /dev/btrfs-control");
+ return 10;
+ }
+
+ for( i = 0 ; i < nargs ; i++ ){
+ struct btrfs_ioctl_vol_args args;
+ int ret;
+
+ printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
+
+ strcpy(args.name, argv[i]);
+ /*
+ * FIXME: which are the error code returned by this ioctl ?
+ * it seems that is impossible to undetand if there no is
+ * a btrfs filesystem from an I/O error !!!
+ */
+ ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
+
+ if( ret < 0 ){
+ close(fd);
+ fprintf(stderr, "ERROR: unable to scan the device
'%s'\n", argv[i]);
+ return 11;
+ }
+ }
+
+ close(fd);
+ return 0;
+
+}
+
+int do_defrag(int argc, char **argv)
+{
+
+ int i, ret=0;
+
+ for(i=0 ; i <argc ; i++){
+ int fd, res;
+ char *path = argv[i];
+ fd = open_file_or_dir(path);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n",
path);
+ ret++;
+ continue;
+ }
+
+ printf("Defrag '%s'\n", path);
+ res = ioctl(fd, BTRFS_IOC_DEFRAG);
+ close(fd);
+ if( res < 0 ){
+ fprintf(stderr, "ERROR: unable to defrag '%s'\n",
argv[i]);
+ ret++;
+ continue;
+ }
+ }
+
+ /*
+ * the return code is 0 (success) or the number of the failure + 20
+ */
+ if(ret)
+ ret+=20;
+ return ret;
+}
+
+int do_resize(int argc, char **argv)
+{
+
+ struct btrfs_ioctl_vol_args args;
+ int fd, res, len;
+ char *amount=argv[0], *path=argv[1];
+
+ fd = open_file_or_dir(path);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", path);
+ return 12;
+ }
+ len = strlen(amount);
+ if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
+ fprintf(stderr, "ERROR: size value too long ('%s)\n",
+ amount);
+ return 14;
+ }
+
+ printf("Resize '%s' of '%s'\n", path, amount);
+ strcpy(args.name, amount);
+ res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
+ close(fd);
+ if( res < 0 ){
+ fprintf(stderr, "ERROR: unable to resize '%s'\n", path);
+ return 30;
+ }
+ return 0;
+}
+
+static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
+{
+ struct list_head *cur;
+ struct btrfs_device *device;
+
+ list_for_each(cur, &fs_devices->devices) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ if ((device->label && strcmp(device->label, search) == 0) ||
+ strcmp(device->name, search) == 0)
+ return 1;
+ }
+ return 0;
+}
+
+static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
+{
+ char uuidbuf[37];
+ struct list_head *cur;
+ struct btrfs_device *device;
+ char *super_bytes_used;
+ u64 devs_found = 0;
+ u64 total;
+
+ uuid_unparse(fs_devices->fsid, uuidbuf);
+ device = list_entry(fs_devices->devices.next, struct btrfs_device,
+ dev_list);
+ if (device->label && device->label[0])
+ printf("Label: '%s' ", device->label);
+ else
+ printf("Label: none ");
+
+ super_bytes_used = pretty_sizes(device->super_bytes_used);
+
+ total = device->total_devs;
+ printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
+ (unsigned long long)total, super_bytes_used);
+
+ free(super_bytes_used);
+
+ list_for_each(cur, &fs_devices->devices) {
+ char *total_bytes;
+ char *bytes_used;
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ total_bytes = pretty_sizes(device->total_bytes);
+ bytes_used = pretty_sizes(device->bytes_used);
+ printf("\tdevid %4llu size %s used %s path %s\n",
+ (unsigned long long)device->devid,
+ total_bytes, bytes_used, device->name);
+ free(total_bytes);
+ free(bytes_used);
+ devs_found++;
+ }
+ if (devs_found < total) {
+ printf("\t*** Some devices missing\n");
+ }
+ printf("\n");
+}
+
+int do_show_filesystem(int argc, char **argv)
+{
+ struct list_head *all_uuids;
+ struct btrfs_fs_devices *fs_devices;
+ struct list_head *cur_uuid;
+ char *search = argv[0];
+ int ret;
+
+ ret = btrfs_scan_one_dir("/dev", 0);
+ if (ret){
+ fprintf(stderr, "ERROR: error %d while scanning\n", ret);
+ return 18;
+ }
+
+ all_uuids = btrfs_scanned_uuids();
+ list_for_each(cur_uuid, all_uuids) {
+ fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
+ list);
+ if (search && uuid_search(fs_devices, search) == 0)
+ continue;
+ print_one_uuid(fs_devices);
+ }
+ printf("%s\n", BTRFS_BUILD_VERSION);
+ return 0;
+}
+
+int do_add_volume(int nargs, char **args)
+{
+
+ char *mntpnt = args[nargs-1];
+ int i, fdmnt, ret=0;
+
+
+ fdmnt = open_file_or_dir(mntpnt);
+ if (fdmnt < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
+ return 12;
+ }
+
+ for(i=0 ; i < (nargs-1) ; i++ ){
+ struct btrfs_ioctl_vol_args ioctl_args;
+ int devfd, res;
+ u64 dev_block_count = 0;
+ struct stat st;
+
+ devfd = open(args[i], O_RDWR);
+ if (!devfd) {
+ fprintf(stderr, "ERROR: Unable to open device '%s'\n",
args[i]);
+ close(devfd);
+ ret++;
+ continue;
+ }
+ ret = fstat(devfd, &st);
+ if (ret) {
+ fprintf(stderr, "ERROR: Unable to stat '%s'\n",
args[i]);
+ close(devfd);
+ ret++;
+ continue;
+ }
+ if (!S_ISBLK(st.st_mode)) {
+ fprintf(stderr, "ERROR: '%s' is not a block device\n",
args[i]);
+ close(devfd);
+ ret++;
+ continue;
+ }
+
+ res = btrfs_prepare_device(devfd, args[i], 1,
&dev_block_count);
+ if (ret) {
+ fprintf(stderr, "ERROR: Unable to init '%s'\n",
args[i]);
+ close(devfd);
+ ret++;
+ continue;
+ }
+ close(devfd);
+
+ strcpy(ioctl_args.name, args[i]);
+ res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
+ if(res<0){
+ fprintf(stderr, "ERROR: error adding the device
'%s'\n", args[i]);
+ ret++;
+ }
+
+ }
+
+ close(fdmnt);
+ if( ret)
+ return ret+20;
+ else
+ return 0;
+
+}
+
+int do_balance(int argc, char **argv)
+{
+
+ int fdmnt, ret=0;
+ char *path = argv[0];
+
+ fdmnt = open_file_or_dir(path);
+ if (fdmnt < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", path);
+ return 12;
+ }
+
+ ret = ioctl(fdmnt, BTRFS_IOC_BALANCE);
+ close(fdmnt);
+ if(ret<0){
+ fprintf(stderr, "ERROR: balancing '%s'\n", path);
+
+ return 19;
+ }
+ return 0;
+}
+int do_remove_volume(int nargs, char **args)
+{
+
+ char *mntpnt = args[nargs-1];
+ int i, fdmnt, ret=0;
+
+ fdmnt = open_file_or_dir(mntpnt);
+ if (fdmnt < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
+ return 12;
+ }
+
+ for(i=0 ; i < (nargs-1) ; i++ ){
+ struct btrfs_ioctl_vol_args arg;
+ int res;
+
+ strcpy(arg.name, args[i]);
+ res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
+ if(res<0){
+ fprintf(stderr, "ERROR: error removing the device
'%s'\n", args[i]);
+ ret++;
+ }
+ }
+
+ close(fdmnt);
+ if( ret)
+ return ret+20;
+ else
+ return 0;
+}
\ No newline at end of file
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
new file mode 100644
index 0000000..d22d753
--- /dev/null
+++ b/btrfs_cmds.h
@@ -0,0 +1,28 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+/* btrfs_cmds.c*/
+int do_clone(int nargs, char **argv);
+int do_delete_subvolume(int nargs, char **argv);
+int do_create_subvol(int nargs, char **argv);
+int do_fssync(int nargs, char **argv);
+int do_defrag(int argc, char **argv);
+int do_show_filesystem(int nargs, char **argv);
+int do_add_volume(int nargs, char **args);
+int do_balance(int nargs, char **argv);
+int do_remove_volume(int nargs, char **args);
+int do_scan(int nargs, char **argv);
+int do_resize(int nargs, char **argv);
--
gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) <kreijackATinwind.it>
Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512
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