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Add sync and transaction ioctl defs

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btrfsctl -c forces a single FS sync

The transaction ioctls are unsafe for general use because they can lead
to deadlocks if the application is not very careful.  But, ceph is
experimenting with btrfs as a backing store, and these ioctls are required
for testing.
This commit is contained in:
Chris Mason 2008-06-10 10:09:18 -04:00 committed by David Woodhouse
parent d8d4df9474
commit 969c548acb
2 changed files with 12 additions and 0 deletions
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3
btrfsctl.c
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@ -51,6 +51,7 @@ void print_usage(void)
printf("\t-r [+-]size[gkm] resize the FS\n");
printf("\t-A device scans the device for a Btrfs filesystem\n");
printf("\t-a scans all devices for Btrfs filesystems\n");
printf("\t-c forces a single FS sync\n");
exit(1);
}
@ -115,6 +116,8 @@ int main(int ac, char **av)
exit(1);
}
command = BTRFS_IOC_RESIZE;
} else if (strcmp(av[i], "-c") == 0) {
command = BTRFS_IOC_SYNC;
}
}
if (command == 0) {

9
ioctl.h
View file

@ -36,6 +36,14 @@ struct btrfs_ioctl_vol_args {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
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
*/
#define BTRFS_IOC_TRANS_START _IO(BTRFS_IOCTL_MAGIC, 6)
#define BTRFS_IOC_TRANS_END _IO(BTRFS_IOCTL_MAGIC, 7)
#define BTRFS_IOC_SYNC _IO(BTRFS_IOCTL_MAGIC, 8)
#define BTRFS_IOC_CLONE _IOW(BTRFS_IOCTL_MAGIC, 9, int)
#define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
struct btrfs_ioctl_vol_args)
@ -43,4 +51,5 @@ struct btrfs_ioctl_vol_args {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
struct btrfs_ioctl_vol_args)
#endif