[PATCH 1/2 V2] btrfs, a new tool to manage a btrfs filesystem; source code

Goffredo Baroncelli
2010-02-17T20:02:24Z

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This is the source code of btrfs.c.
The main changes from my previous patch are:
- Rearranged the short command in order to avoid conflicts
- Renamed the 'create' verb is 'subvolume'
- Rearranged the parsing code, which now is integrated in the help in order to avoid mismatch

BR
G.Baroncelli

diff --git a/Makefile b/Makefile
index 02f881e..888ef8d 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ bindir = $(prefix)/bin
LIBS=-luuid

progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck \
- btrfs-map-logical
+ btrfs-map-logical btrfs

# make C=1 to enable sparse
ifdef C
@@ -36,6 +36,9 @@ all: version $(progs) manpages
version:
bash version.sh

+btrfs: $(objects) btrfs.o
+ gcc $(CFLAGS) -o btrfs btrfs.o $(objects) $(LDFLAGS) $(LIBS)
+
btrfsctl: $(objects) btrfsctl.o
gcc $(CFLAGS) -o btrfsctl btrfsctl.o $(objects) $(LDFLAGS) $(LIBS)

diff --git a/btrfs.c b/btrfs.c
new file mode 100644
index 0000000..cc55599
--- /dev/null
+++ b/btrfs.c
@@ -0,0 +1,775 @@
+/*
+ * 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"
+
+#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;
+}
+
+static int do_clone(char *subvol, char *dst)
+{
+ int res, fd, fddst;
+ char *newname;
+ char *dstdir;
+ 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;
+ }
+
+ 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;
+
+}
+
+static int do_delete_subvolume(char *path)
+{
+ int res, fd;
+ struct btrfs_ioctl_vol_args args;
+ char *dname, *vname, *cpath;
+
+ 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;
+ }
+
+ 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;
+
+}
+
+static int do_create_subvol(char *dst)
+{
+ int res, fddst;
+ char *newname;
+ char *dstdir;
+ struct btrfs_ioctl_vol_args args;
+
+ 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;
+ }
+
+ 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;
+
+}
+
+static int do_fssync(char *path)
+{
+ int fd, res;
+
+ 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;
+}
+
+static 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;
+
+}
+
+static 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;
+}
+
+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");
+}
+
+static int do_show_volume(char *search)
+{
+ struct list_head *all_uuids;
+ struct btrfs_fs_devices *fs_devices;
+ struct list_head *cur_uuid;
+ 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;
+}
+
+static 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;
+
+}
+
+static int do_balance(char *path)
+{
+
+ int fdmnt, ret=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;
+}
+static 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;
+}
+
+struct Command {
+ int nargs; /* if == 999, any number of arguments
+ if >= 0, number of arguments,
+ if < 0, _minimum_ number of arguments */
+ char *verb, *alias; /* verb and alias */
+ char *help; /* help lines; form the 2nd onward they are
+ indented */
+};
+
+static struct Command commands[] = {
+
+ /*
+ avoid short commands different for the case only
+ */
+ { 2, "snapshot", "-s", "[<dest>/]<name>\n"
+ "Create a writeble snapshot of the subvolume with\n"
+ "the name <name> in the <dest> directory."
+ },
+ { 1, "delete", "-D","<subvolume>\n"
+ "Delete the subvolume <subvolume>."
+ },
+ { 1, "subvolume", "-c", "[<dest>/]<name>\n"
+ "Create a subvolume in <dest> (or the current directory if\n"
+ "not passed)."
+ },
+ {-1, "defrag", "-f", "<file>| [<file>| ...]\n"
+ "Defragment a file or a directory."
+ },
+ { 999, "scan", "-n", "[<device> [<device>..]\n"
+ "Scan all device for or the passed device for a btrfs\n"
+ "filesystem."
+ },
+ { 1, "fssync", "-y", "<path>\n"
+ "Force a fs sync on the filesystem <path>"
+ },
+ { 2, "resize", "-z", "[+/-]<newsize>[gkm]|max <filesystem>\n"
+ "Resize the file system. If 'max' is passed, the filesystem\n"
+ "will occupe all available space on the device."
+ },
+ { 999, "show", "-l", "[<dev>| ...]\n"
+ "Show the btrfs devices"
+ },
+ { 1, "balance", "-b", "<path>\n"
+ "Balance the chunk across the device"
+ },
+ { -1, "add-dev", "-A", "<dev> [<dev>..] <path>\n"
+ "Add a device to a filesystem"
+ },
+ { -1, "rm-dev", "-R", "<dev> [<dev>..] <path>\n"
+ "Remove a device to a filesystem"
+ },
+ /* coming soon
+ { 2, "label", "-m", " <path>\n"
+ "Set the label of a filesystem"
+ }
+ { 2, "list", "-t", "<path>\n"
+ "List the snapshot/subvolume of a filesystem"
+ }
+ */
+
+ { 0, 0 , 0 }
+};
+
+static void help(char *programname)
+{
+ char *np, *pc;
+ struct Command *cp;
+
+ np = strrchr(programname,'/');
+ if(!np)
+ np = programname;
+ else
+ np++;
+
+ printf("Usage:\n");
+
+ for( cp = commands; cp->alias || cp->verb; cp++ ){
+ /* this syntax allows a command with a verb (or alias) only */
+ printf("\t%s %s%s%s ", np,
+ cp->verb ? cp->verb : "",
+ cp->verb && cp->alias ? "|": "",
+ cp->alias ? cp->alias : "");
+
+ for(pc = cp->help; *pc; pc++){
+ putchar(*pc);
+ if(*pc == '\n')
+ printf("\t\t");
+ }
+ putchar('\n');
+ }
+
+ printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np);
+ printf("\n%s\n", BTRFS_BUILD_VERSION);
+
+}
+
+static int parse_args(int argc, char **argv,
+ int *nargs_, char **cmd_, char ***args_ )
+{
+ struct Command *cp;
+ char *cmd=0, **args;
+ int nargs = argc -2;
+
+ if( argc < 2 || !strcmp(argv[1], "help") ||
+ !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")){
+ help(argv[0]);
+ return 0;
+ }
+
+ for( cp = commands; cp->alias || cp->verb; cp++ ){
+ if (strcmp(argv[1], cp->alias) && strcmp(argv[1], cp->verb))
+ continue;
+ if (cp->nargs < 0 && cp->nargs < -nargs ){
+ fprintf(stderr, "ERROR: '%s' requires minimum %d arg(s)\n",
+ argv[1], -cp->nargs);
+ exit(2);
+ }
+ if(cp->nargs >= 0 && cp->nargs != nargs && cp->nargs != 999 ){
+ fprintf(stderr, "ERROR: '%s' requires %d arg(s)\n",
+ argv[1], cp->nargs);
+ exit(2);
+ }
+
+ cmd = cp->verb ? cp->verb : cp->alias;
+ args = argv+2;
+ break;
+ }
+
+ if(!cmd){
+ fprintf( stderr, "ERROR: unknow command '%s'\n",argv[1]);
+ help(argv[0]);
+ return -1;
+ }
+
+ *cmd_ = cmd;
+ *args_ = args;
+ *nargs_ = nargs;
+ return 1;
+}
+
+int main(int ac, char **av )
+{
+
+ char *cmd, **args;
+ int nargs, r;
+
+ r = parse_args(ac, av, &nargs, &cmd, &args);
+ if( r <= 0 ){
+ /* error or no command to parse*/
+ exit(-r);
+ }
+
+ if( !strcmp(cmd, "scan") ){
+ exit(do_scan(nargs, args));
+
+ }else if( !strcmp(cmd, "defrag") ){
+ exit(do_defrag(nargs, args));
+
+ }else if( !strcmp(cmd, "snapshot")){
+ exit(do_clone(args[0], args[1]));
+
+ }else if( !strcmp(cmd, "subvolume")){
+ exit(do_create_subvol(args[0]));
+
+ }else if( !strcmp(cmd, "fssync") ){
+ exit(do_fssync(args[0]));
+
+ }else if( !strcmp(cmd, "delete")){
+ exit(do_delete_subvolume(args[0]));
+
+ }else if( !strcmp(cmd, "show")){
+ exit(do_show_volume(nargs ? args[0]:0));
+
+ }else if( !strcmp(cmd, "add-dev")){
+ exit(do_add_volume(nargs, args));
+
+ }else if( !strcmp(cmd, "rm-dev")){
+ exit(do_remove_volume(nargs, args));
+
+ }else if( !strcmp(cmd, "balance")){
+ exit(do_balance(args[0]));
+
+ }
+
+ fprintf(stderr, "ERROR: internal parsing error\n");
+ exit(111);
+
+}
+

--
gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) <kreijackATinwind.it>
Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512

[-- Attachment #2: This is a digitally signed message part. --]
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