sbread(3) [freebsd man page]

SBREAD(3)						   BSD Library Functions Manual 						 SBREAD(3)

NAME

     sbread, sbwrite -- read and write superblocks of a UFS file system

LIBRARY

     UFS File System Access Library (libufs, -lufs)

SYNOPSIS

     #include <sys/param.h>
     #include <sys/mount.h>
     #include <ufs/ufs/ufsmount.h>
     #include <ufs/ufs/dinode.h>
     #include <ufs/ffs/fs.h>
     #include <libufs.h>

     int
     sbread(struct uufsd *disk);

     int
     sbwrite(struct uufsd *disk, int all);

DESCRIPTION

     The sbread() and sbwrite() functions provide superblock reads and writes for libufs(3) consumers.	The sbread() and sbwrite() functions oper-
     ate on the superblock field, d_sb, associated with a given userland UFS disk structure.  Additionally, the sbwrite() function will write to
     all superblock locations if the all value is non-zero.

RETURN VALUES

     The sbread() and sbwrite() functions return the value 0 if successful; otherwise the value -1 is returned and the global variable errno is
     set to indicate the error.

ERRORS

     The function sbread() may fail and set errno for any of the errors specified for the library function bread(3).  Additionally, it may follow
     the libufs(3) error methodologies in situations where no usable superblock could be found.

     The function sbwrite() may fail and set errno for any of the errors specified for the library function bwrite(3).

SEE ALSO

     bread(3), bwrite(3), libufs(3)

HISTORY

     These functions first appeared as part of libufs(3) in FreeBSD 5.0.

AUTHORS

     Juli Mallett <jmallett@FreeBSD.org>

BSD
								   June 4, 2003 							       BSD

UFS_DISK_CLOSE(3)					   BSD Library Functions Manual 					 UFS_DISK_CLOSE(3)

NAME

     ufs_disk_close, ufs_disk_fillout, ufs_disk_fillout_blank, ufs_disk_write -- open and close userland UFS disks

LIBRARY

     UFS File System Access Library (libufs, -lufs)

SYNOPSIS

     #include <sys/param.h>
     #include <sys/mount.h>
     #include <ufs/ufs/ufsmount.h>
     #include <ufs/ufs/dinode.h>
     #include <ufs/ffs/fs.h>
     #include <libufs.h>

     int
     ufs_disk_close(struct uufsd *disk);

     int
     ufs_disk_fillout(struct uufsd *disk, const char *name);

     int
     ufs_disk_fillout_blank(struct uufsd *disk, const char *name);

     int
     ufs_disk_write(struct uufsd *disk);

DESCRIPTION

     The ufs_disk_close() function closes a disk and frees internal memory related to it.  It does not free the disk structure.

     The ufs_disk_fillout() and ufs_disk_fillout_blank() functions open a disk specified by name and populate the structure pointed to by disk.
     The disk is opened read-only.  The specified name may be either a mountpoint, a device name or a filesystem image.  The ufs_disk_fillout()
     function assumes there is a valid superblock and will fail if not, whereas the ufs_disk_fillout_blank() function makes no assumptions of that
     sort.

     The ufs_disk_write() function attempts to re-open a disk as writable if it is not currently.

ERRORS

     The function ufs_disk_close() has no failure points.

     The function ufs_disk_fillout() may fail for any of the reasons ufs_disk_fillout_blank() might, as well as for any reason sbread(3) might.

     The ufs_disk_fillout_blank() may fail and set errno for any of the errors specified for the library functions open(2), strdup(3).	Addition-
     ally, it may follow the libufs(3) error methodologies in situations where no device could be found to open.

     The function ufs_disk_write() may fail and set errno for any of the errors specified for the library functions open(2) and stat(2).  Namely,
     it will fail if the disk in question may not be written to.

SEE ALSO

     open(2), getfsfile(3), libufs(3), sbread(3)

HISTORY

     These functions first appeared as part of libufs(3) in FreeBSD 5.0.

AUTHORS

     Juli Mallett <jmallett@FreeBSD.org>

BSD
								   June 4, 2003 							       BSD