resend Aaron Straus's patch
Signed-off-by: Yan Zheng <zheng....@oracle.com>
---
diff --git a/btrfsctl.c b/btrfsctl.c
index b323818..66c4e89 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -46,7 +46,7 @@ static inline int ioctl(int fd, int define, void *arg) {
return 0; }
static void print_usage(void)
{
printf("usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]\n");
- printf(" [-r size] [-A device] [-a] [-c]\n");
+ printf(" [-r size] [-A device] [-a] [-c] [-D dir .]\n");
printf("\t-d filename: defragments one file\n");
printf("\t-d directory: defragments the entire Btree\n");
printf("\t-s snap_name dir: creates a new snapshot of dir\n");
@@ -55,6 +55,7 @@ static void print_usage(void)
printf("\t-A device: scans the device file for a Btrfs filesystem\n");
printf("\t-a: scans all devices for Btrfs filesystems\n");
printf("\t-c: forces a single FS sync\n");
+ printf("\t-D: delete snapshot\n");
printf("%s\n", BTRFS_BUILD_VERSION);
exit(1);
}
@@ -158,6 +159,18 @@ int main(int ac, char **av)
print_usage();
}
command = BTRFS_IOC_DEFRAG;
+ } else if (strcmp(av[i], "-D") == 0) {
+ if (i >= ac - 1) {
+ fprintf(stderr, "-D requires an arg\n");
+ print_usage();
+ }
+ command = BTRFS_IOC_SNAP_DESTROY;
+ name = av[i + 1];
+ len = strlen(name);
+ if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
+ fprintf(stderr, "-D size too long\n");
+ exit(1);
+ }
} else if (strcmp(av[i], "-A") == 0) {
if (i >= ac - 1) {
fprintf(stderr, "-A requires an arg\n");
diff --git a/ioctl.h b/ioctl.h
index a084f33..4410ac0 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -56,4 +56,7 @@ struct btrfs_ioctl_vol_args {
/* 13 is for CLONE_RANGE */
#define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
struct btrfs_ioctl_vol_args)
+
+#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
+ struct btrfs_ioctl_vol_args)
#endif
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