On 06/21/2012 10:10 PM, Josef Bacik wrote:
> This command will be used by things like dracut that wish to know very
> simply if all of the devices have been added to the kernel cache yet for the
> device to be fully mounted. This keeps initrd's from constantly having to
> try to mount the file system until it succeeds every time a device is added
> to the system. Thanks,
>
Please Josef, when you submit a patch to btrfs-progs that adds a new
command pay attention to update the man page too.
Se below my other syggestions:
Thanks
G.Baroncelli
> Signed-off-by: Josef Bacik <jba...@fusionio.com>
> ---
> cmds-device.c | 35 +++++++++++++++++++++++++++++++++++
> ioctl.h | 2 ++
> 2 files changed, 37 insertions(+), 0 deletions(-)
>
> diff --git a/cmds-device.c b/cmds-device.c
> index db625a6..fccf870 100644
> --- a/cmds-device.c
> +++ b/cmds-device.c
> @@ -246,11 +246,46 @@ static int cmd_scan_dev(int argc, char **argv)
> return 0;
> }
>
> +static const char * const cmd_ready_dev_usage[] = {
> + "btrfs device ready <device>",
What about
btrfs device check-volume <device>
> + "Check device to see if it has all of it's devices in cache for
> mounting",
I suggest:
Check if all the devices of the volume which owns <device> are
registered.
> + NULL
> +};
> +
> +static int cmd_ready_dev(int argc, char **argv)
> +{
> + struct btrfs_ioctl_vol_args args;
> + int fd;
> + int ret;
> +
> + if (check_argc_min(argc, 2))
> + usage(cmd_ready_dev_usage);
> +
> + fd = open("/dev/btrfs-control", O_RDWR);
> + if (fd < 0) {
> + perror("failed to open /dev/btrfs-control");
> + return 10;
> + }
> +
> + strncpy(args.name, argv[argc - 1], BTRFS_PATH_NAME_MAX);
> + ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
> + if (ret < 0) {
> + fprintf(stderr, "ERROR: unable to determine if the device '%s'"
> + " is ready for mounting - %s\n", argv[argc - 1],
> + strerror(errno));
> + ret = 1;
> + }
> +
> + close(fd);
> + return ret;
> +}
> +
> const struct cmd_group device_cmd_group = {
> device_cmd_group_usage, NULL, {
> { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
> { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
> { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
> + { "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
> { 0, 0, 0, 0, 0 }
> }
> };
> diff --git a/ioctl.h b/ioctl.h
> index f2e5d8d..e5f8a94 100644
> --- a/ioctl.h
> +++ b/ioctl.h
> @@ -330,5 +330,7 @@ struct btrfs_ioctl_logical_ino_args {
> struct btrfs_ioctl_ino_path_args)
> #define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
> struct btrfs_ioctl_ino_path_args)
> +#define BTRFS_IOC_DEVICES_READY _IOW(BTRFS_IOCTL_MAGIC, 54, \
> + struct btrfs_ioctl_vol_args)
>
> #endif
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