Setting subvolume/snapshot readonly has been missing for a long time.
With this patch, we can set a subvolume/snapshot readonly via:
o btrfs subvolume set-ro <path>
Signed-off-by: Liu Bo <liubo2009@xxxxxxxxxxxxxx>
---
cmds-subvolume.c | 40 ++++++++++++++++++++++++++++++++++++++++
ioctl.h | 7 +++++++
2 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 950fa8f..5ee31cb 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -512,6 +512,44 @@ static int cmd_find_new(int argc, char **argv)
return 0;
}
+static const char * const cmd_subvol_set_ro_usage[] = {
+ "btrfs subvolume set-ro <path>",
+ "Set the subvolume ro",
+ NULL
+};
+
+static int cmd_subvol_set_ro(int argc, char **argv)
+{
+ int ret=0, fd, e;
+ char *path;
+ struct btrfs_ioctl_get_set_flags_args args;
+
+ if (check_argc_exact(argc, 2))
+ usage(cmd_subvol_set_ro_usage);
+
+ path = argv[1];
+
+ memset(&args, 0, sizeof(args));
+
+ fd = open_file_or_dir(path);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access to '%s'\n", path);
+ return 12;
+ }
+
+ args.flags |= BTRFS_SUBVOL_RDONLY;
+ args.objectid = 0;
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &args);
+ e = errno;
+ close(fd);
+ if( ret < 0 ){
+ fprintf(stderr, "ERROR: unable to set a subvolume RO- %s\n",
+ strerror(e));
+ return 30;
+ }
+ return 0;
+}
+
const struct cmd_group subvolume_cmd_group = {
subvolume_cmd_group_usage, NULL, {
{ "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 },
@@ -522,6 +560,8 @@ const struct cmd_group subvolume_cmd_group = {
cmd_subvol_get_default_usage, NULL, 0 },
{ "set-default", cmd_subvol_set_default,
cmd_subvol_set_default_usage, NULL, 0 },
+ { "set-ro", cmd_subvol_set_ro,
+ cmd_subvol_set_ro_usage, NULL, 0 },
{ "find-new", cmd_find_new, cmd_find_new_usage, NULL, 0 },
{ 0, 0, 0, 0, 0 }
}
diff --git a/ioctl.h b/ioctl.h
index f2e5d8d..9c066eb 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -42,6 +42,11 @@ struct btrfs_ioctl_vol_args_v2 {
char name[BTRFS_SUBVOL_NAME_MAX + 1];
};
+struct btrfs_ioctl_get_set_flags_args {
+ __u64 objectid;
+ __u64 flags;
+};
+
#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
@@ -312,6 +317,8 @@ struct btrfs_ioctl_logical_ino_args {
struct btrfs_ioctl_space_args)
#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
struct btrfs_ioctl_vol_args_v2)
+#define BTRFS_IOC_SUBVOL_GETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 25, __u64)
+#define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
#define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
struct btrfs_ioctl_scrub_args)
#define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
--
1.6.5.2
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
