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Add support for read-only subvolumes. 

Use BTRFS_IOC_CREATE_SNAP_V2 instead of BTRFS_IOC_CREATE_SNAP and add
an option for the creation of a readonly snapshot.

Signed-off-by: Andreas Philipp <philipp.andreas@gmail.com>
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
master
Andreas Philipp 2011-04-26 10:02:41 +02:00 committed by Chris Mason
parent 501a867d36
commit b19c828f16
1 changed files with 40 additions and 8 deletions
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48
btrfs_cmds.c
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@ -44,7 +44,7 @@
#ifdef __CHECKER__
#define BLKGETSIZE64 0
#define BTRFS_IOC_SNAP_CREATE 0
#define BTRFS_IOC_SNAP_CREATE_V2 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; }
@ -330,13 +330,38 @@ int do_subvol_list(int argc, char **argv)
int do_clone(int argc, char **argv)
{
char *subvol, *dst;
int res, fd, fddst, len, e;
int res, fd, fddst, len, e, optind = 0, readonly = 0;
char *newname;
char *dstdir;
struct btrfs_ioctl_vol_args_v2 args;
subvol = argv[1];
dst = argv[2];
struct btrfs_ioctl_vol_args args;
memset(&args, 0, sizeof(args));
while (1) {
int c = getopt(argc, argv, "r");
if (c < 0)
break;
switch (c) {
case 'r':
optind++;
readonly = 1;
break;
default:
fprintf(stderr,
"Invalid arguments for subvolume snapshot\n");
free(argv);
return 1;
}
}
if (argc - optind < 2) {
fprintf(stderr, "Invalid arguments for subvolume snapshot\n");
free(argv);
return 1;
}
subvol = argv[optind+1];
dst = argv[optind+2];
res = test_issubvolume(subvol);
if(res<0){
@ -392,11 +417,18 @@ int do_clone(int argc, char **argv)
return 12;
}
printf("Create a snapshot of '%s' in '%s/%s'\n",
subvol, dstdir, newname);
if (readonly) {
args.flags |= BTRFS_SUBVOL_RDONLY;
printf("Create a readonly snapshot of '%s' in '%s/%s'\n",
subvol, dstdir, newname);
} else {
printf("Create a snapshot of '%s' in '%s/%s'\n",
subvol, dstdir, newname);
}
args.fd = fd;
strncpy(args.name, newname, BTRFS_PATH_NAME_MAX);
res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE, &args);
res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_V2, &args);
e = errno;
close(fd);