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cgread(3)

NAME

     cgread, cgread1 -- read cylinder groups of 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
     cgread(struct uufsd *disk);

     int
     cgread1(struct uufsd *disk, int c);

DESCRIPTION

     The cgread() and cgread1() functions provide cylinder group reads for
     libufs(3) consumers.  The cgread1() function reads from one cylinder
     group, specified by c into the d_cg field of a userland UFS disk struc-
     ture.  It sets the d_lcg field to the cylinder group number c.

     The cgread() function operates on sequential cylinder groups.  Calling
     the cgread() function is equivalent to calling cgread1() with a cylinder
     group specifier equivalent to the value of the current d_ccg field, and
     then incrementing the d_ccg field.

RETURN VALUES

     Both functions return 0 if there are no more cylinder groups to read, 1
     if there are more cylinder groups, and -1 on error.

ERRORS

     The function cgread() may fail and set errno for any of the errors speci-
     fied for the library function bread(3).

     The function cgread1() has semantically identical failure conditions to
     those of cgread().

SEE ALSO

     bread(3), libufs(3)

HISTORY

     These functions first appeared as part of libufs(3) in FreeBSD 5.1.

AUTHORS

     Juli Mallett <jmallett@FreeBSD.org>

FreeBSD 5.4			 June 4, 2003			   FreeBSD 5.4

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