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Btrfs-progs: add btrfs device ready command 

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,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Gene Czarcinski <gene@czarc.net>
master
Josef Bacik 2013-01-19 13:06:20 -05:00 committed by David Sterba
parent 124053b1d9
commit ce814a9378
2 changed files with 37 additions and 0 deletions
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35
cmds-device.c
View File

@ -250,11 +250,46 @@ static int cmd_scan_dev(int argc, char **argv)
return 0;
}
static const char * const cmd_ready_dev_usage[] = {
"btrfs device ready <device>",
"Check device to see if it has all of it's devices in cache for mounting",
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 }
}
};

2
ioctl.h
View File

@ -419,6 +419,8 @@ struct btrfs_ioctl_clone_range_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 _IOR(BTRFS_IOCTL_MAGIC, 39, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \
struct btrfs_ioctl_received_subvol_args)