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Btrfs-progs: quota rescan

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This adds the quota rescan command to be used if qgroup tracking should get
out of sync. Can also be used to query the status of a running rescan
operation.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt 2013-04-05 13:44:06 +02:00 committed by David Sterba
parent aa5f0626f8
commit e9217541db
2 changed files with 85 additions and 25 deletions
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64
cmds-quota.c
View file

@ -93,18 +93,70 @@ static int cmd_quota_disable(int argc, char **argv)
}
static const char * const cmd_quota_rescan_usage[] = {
"btrfs quota rescan <path>",
"Rescan the subvolume for a changed quota setting.",
"Not yet implemented.",
"btrfs quota rescan [-s] <path>",
"Trash all qgroup numbers and scan the metadata again with the current config.",
"",
"-s show status of a running rescan operation",
NULL
};
static int cmd_quota_rescan(int argc, char **argv)
{
int ret = quota_ctl(BTRFS_QUOTA_CTL_RESCAN, argc, argv);
if (ret < 0)
int ret = 0;
int fd;
int e;
char *path = NULL;
struct btrfs_ioctl_quota_rescan_args args;
int ioctlnum = BTRFS_IOC_QUOTA_RESCAN;
optind = 1;
while (1) {
int c = getopt(argc, argv, "s");
if (c < 0)
break;
switch (c) {
case 's':
ioctlnum = BTRFS_IOC_QUOTA_RESCAN_STATUS;
break;
default:
usage(cmd_quota_rescan_usage);
return ret;
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_quota_rescan_usage);
memset(&args, 0, sizeof(args));
path = argv[optind];
fd = open_file_or_dir(path);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 12;
}
ret = ioctl(fd, ioctlnum, &args);
e = errno;
close(fd);
if (ioctlnum == BTRFS_IOC_QUOTA_RESCAN) {
if (ret < 0) {
fprintf(stderr, "ERROR: quota rescan failed: "
"%s\n", strerror(e));
return 30;
} else {
printf("quota rescan started\n");
}
} else {
if (!args.flags) {
printf("no rescan operation in progress\n");
} else {
printf("rescan operation running (current key %lld)\n",
args.progress);
}
}
return 0;
}
const struct cmd_group quota_cmd_group = {

46
ioctl.h
View file

@ -384,25 +384,6 @@ struct btrfs_ioctl_send_args {
__u64 reserved[4]; /* in */
};
#define BTRFS_QUOTA_CTL_ENABLE 1
#define BTRFS_QUOTA_CTL_DISABLE 2
#define BTRFS_QUOTA_CTL_RESCAN 3
struct btrfs_ioctl_quota_ctl_args {
__u64 cmd;
__u64 status;
};
struct btrfs_ioctl_qgroup_assign_args {
__u64 assign;
__u64 src;
__u64 dst;
};
struct btrfs_ioctl_qgroup_create_args {
__u64 create;
__u64 qgroupid;
};
enum btrfs_dev_stat_values {
/* disk I/O failure stats */
BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
@ -437,6 +418,29 @@ struct btrfs_ioctl_get_dev_stats {
};
/* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
#define BTRFS_QUOTA_CTL_ENABLE 1
#define BTRFS_QUOTA_CTL_DISABLE 2
/* 3 has formerly been reserved for BTRFS_QUOTA_CTL_RESCAN */
struct btrfs_ioctl_quota_ctl_args {
__u64 cmd;
__u64 status;
};
struct btrfs_ioctl_quota_rescan_args {
__u64 flags;
__u64 progress;
};
struct btrfs_ioctl_qgroup_assign_args {
__u64 assign;
__u64 src;
__u64 dst;
};
struct btrfs_ioctl_qgroup_create_args {
__u64 create;
__u64 qgroupid;
};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@ -520,6 +524,10 @@ struct btrfs_ioctl_clone_range_args {
struct btrfs_ioctl_qgroup_create_args)
#define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
struct btrfs_ioctl_qgroup_limit_args)
#define BTRFS_IOC_QUOTA_RESCAN _IOW(BTRFS_IOCTL_MAGIC, 44, \
struct btrfs_ioctl_quota_rescan_args)
#define BTRFS_IOC_QUOTA_RESCAN_STATUS _IOR(BTRFS_IOCTL_MAGIC, 45, \
struct btrfs_ioctl_quota_rescan_args)
#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
char[BTRFS_LABEL_SIZE])
#define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \