| FSS(4) | Device Drivers Manual | FSS(4) |
fss —
pseudo-device fss 4
fss driver provides a read-only interface to the
snapshot of a currently mounted file system. Reading from a
fss device gives the view of the file system when the
snapshot was taken. It can be configured via
ioctl(2).
<sys/dev/fssvar.h>.
The (third) argument to ioctl(2) should be a pointer to the type indicated.
FSSIOCSET(struct
fss_set)fss device.
struct fss_set {
char *fss_mount;
char *fss_bstore;
blksize_t fss_csize;
int fss_flags;
};
The struct element fss_mount is the mount point of the file system. The struct element fss_bstore is either a regular file or a raw disk device where data overwritten on the file system will be saved. The struct element fss_csize is the preferred size of this data. The struct element fss_flags is the initial set of flags.
FSSIOCGET(struct
fss_get)fss device.
struct fss_get {
char fsg_mount[MNAMELEN];
struct timeval fsg_time;
blksize_t fsg_csize;
blkcnt_t fsg_mount_size;
blkcnt_t fsg_bs_size;
};
FSSIOCCLRfss device.FSSIOFSET(int)fss device. Possible flags
are:
FSS_UNCONFIG_ON_CLOSEfss device on the last
close.FSS_UNLINK_ON_CREATEfss device
is created.FSSIOFGET(int)fss device.fss device appeared in NetBSD
2.0.
| February 24, 2011 | NetBSD 9.2 |