@@ -329,6 +329,82 @@ out:
return !!ret;
}
+static const char * const cmd_device_forget_usage[] = {
+ "btrfs device forget [<device>]",
+ "Forget a scanned device or all stale devices in the btrfs.ko",
+ NULL
+};
+
+static int btrfs_forget_devices(void)
+{
+ struct btrfs_ioctl_vol_args_v2 args;
+ int fd;
+ int ret;
+
+ fd = open("/dev/btrfs-control", O_RDWR);
+ if (fd < 0)
+ return -errno;
+
+ memset(&args, 0, sizeof(args));
+ args.flags = BTRFS_DEVICE_SPEC_ALL;
+ ret = ioctl(fd, BTRFS_IOC_FORGET_DEV, &args);
+ if (ret)
+ ret = -errno;
+ close(fd);
+ return ret;
+
+}
+
+static int btrfs_forget_one_device(char *path)
+{
+ struct btrfs_ioctl_vol_args_v2 args;
+ int fd;
+ int ret;
+
+ fd = open("/dev/btrfs-control", O_RDWR);
+ if (fd < 0)
+ return -errno;
+
+ memset(&args, 0, sizeof(args));
+ strncpy_null(args.name, path);
+ ret = ioctl(fd, BTRFS_IOC_FORGET_DEV, &args);
+ if (ret)
+ ret = -errno;
+ close(fd);
+ return ret;
+}
+
+static int cmd_device_forget(int argc, char **argv)
+{
+ char *path;
+ int ret = 0;
+
+ if (check_argc_max(argc - optind, 1))
+ usage(cmd_device_forget_usage);
+
+ if (argc == 1) {
+ ret = btrfs_forget_devices();
+ if (ret)
+ error("Can't forget: %s", strerror(-ret));
+ return ret;
+ }
+
+ path = canonicalize_path(argv[1]);
+ if (!path) {
+ error("Could not canonicalize path '%s': %s",
+ argv[1], strerror(errno));
+ return -ENOENT;
+ }
+
+ ret = btrfs_forget_one_device(path);
+ if (ret)
+ error("Can't forget '%s': %s", path, strerror(-ret));
+
+ free(path);
+
+ return ret;
+}
+
static const char * const cmd_device_ready_usage[] = {
"btrfs device ready <device>",
"Check device to see if it has all of its devices in cache for mounting",
@@ -604,6 +680,7 @@ const struct cmd_group device_cmd_group = {
CMD_ALIAS },
{ "remove", cmd_device_remove, cmd_device_remove_usage, NULL, 0 },
{ "scan", cmd_device_scan, cmd_device_scan_usage, NULL, 0 },
+ { "forget", cmd_device_forget, cmd_device_forget_usage, NULL, 0 },
{ "ready", cmd_device_ready, cmd_device_ready_usage, NULL, 0 },
{ "stats", cmd_device_stats, cmd_device_stats_usage, NULL, 0 },
{ "usage", cmd_device_usage,
@@ -53,12 +53,14 @@ BUILD_ASSERT(sizeof(struct btrfs_ioctl_vol_args) == 4096);
#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
#define BTRFS_SUBVOL_QGROUP_INHERIT (1ULL << 2)
#define BTRFS_DEVICE_SPEC_BY_ID (1ULL << 3)
+#define BTRFS_DEVICE_SPEC_ALL (1ULL << 4)
#define BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED \
(BTRFS_SUBVOL_CREATE_ASYNC | \
BTRFS_SUBVOL_RDONLY | \
BTRFS_SUBVOL_QGROUP_INHERIT | \
- BTRFS_DEVICE_SPEC_BY_ID)
+ BTRFS_DEVICE_SPEC_BY_ID | \
+ BTRFS_DEVICE_SPEC_ALL)
#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
@@ -721,6 +723,8 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
struct btrfs_ioctl_vol_args)
+#define BTRFS_IOC_FORGET_DEV _IOW(BTRFS_IOCTL_MAGIC, 5, \
+ struct btrfs_ioctl_vol_args)
/* trans start and trans end are dangerous, and only for
* use by applications that know how to avoid the
* resulting deadlocks
This patch adds cli btrfs device forget [dev] which shall remove the relevant device entries in the kernel matching the dev. If no argument is given it shall remove all stale (device which are not mounted) from the kernel. Signed-off-by: Anand Jain <anand.jain@oracle.com> --- cmds-device.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ioctl.h | 6 ++++- 2 files changed, 82 insertions(+), 1 deletion(-)