NetBSD/lib/libc/sys/lfs_bmapv.2

.\"	$NetBSD: lfs_bmapv.2,v 1.4 2002/02/08 01:28:18 ross Exp $
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.Dd May 23, 2000
.Dt LFS_BMAPV 2
.Os
.Sh NAME
.Nm lfs_bmapv
.Nd retrieve disk addresses for arrays of blocks
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include \*[Lt]sys/types.h\*[Gt]
.Fd #include \*[Lt]ufs/lfs/lfs.h\*[Gt]
.Ft int
.Fn lfs_bmapv "fsid_t *fsidp" "BLOCK_INFO *blkiov" "int blkcnt"
.Sh DESCRIPTION
.Fn lfs_bmapv
fills in the bi_daddr field for every block listed in the block array
.Fa blkiov
with the disk address corrseponding to the logical block
.Fa bi_lbn
of the file with inode
.Fa bi_inode .
If
.Fa bi_lbn
is LFS_UNUSED_LBN, the disk location of the inode block containing the
file's inode will be returned in
.Fa bi_daddr
instead.
.Pp
The
.Fa fsidp
argument contains the id of the filesystem to which the inodes and
blocks belong.
The
.Fa blkiov
argument is an array of BLOCK_INFO structures (see below).  The
.Fa blkcnt
argument determines the size of the
.Fa blkiov
array.
.Bd -literal
typedef struct block_info {
    ino_t       bi_inode;     /* inode # */
    ufs_daddr_t bi_lbn;       /* logical block w/in file */
    ufs_daddr_t bi_daddr;     /* disk address of block */
    time_t      bi_segcreate; /* origin segment create time */
    int         bi_version;   /* file version number */
    void       *bi_bp;        /* data buffer */
    int         bi_size;      /* size of the block (if fragment) */
} BLOCK_INFO;
.Ed
.Sh RETURN VALUES
.Fn lfs_bmapv
returns 0 on success, or -1 on error.
.Sh ERRORS
An error return from
.Fn lfs_bmapv
indicates:
.Bl -tag -width Er
.It Bq Er EFAULT
.Fa fsidp
points outside the process's allocated address space.
.It Bq Er EINVAL
.Fa *fsidp
does not specify a valid filesystem.
.El
.Sh SEE ALSO
.Xr lfs_markv 2 ,
.Xr lfs_segclean 2 ,
.Xr lfs_segwait 2 ,
.Xr lfs_cleanerd 8
.Sh HISTORY
The
.Fn lfs_bmapv
function call appeared in
.Bx 4.4 .