CONTENTS

SYNOPSIS

DESCRIPTION

LOCKS

RETURN VALUES

If this is called from the NFS server, the extra arguments eofflag, ncookies and cookies are given. The value of *eofflag should be set to TRUE if the end of the directory is reached while reading. The directory seek cookies are returned to the NFS client and may be used later to restart a directory read part way through the directory. There should be one cookie returned per directory entry. The value of the cookie should be the offset within the directory where the on-disc version of the appropriate directory entry starts. Memory for the cookies should be allocated using:

/*
* Remember the original offset to use later in generating cookies.
*/
off = uio->uio_offset;

/*
* Read directory contents starting at uio->uio_offset into buffer
* pointed to by uio.
*/
...;

if (!error && ncookies != NULL) {
struct dirent *dpStart;
struct dirent *dpEnd;
struct dirent *dp;
int count;
u_int *cookiebuf;
u_int *cookiep;

if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
panic("vop_readdir: unexpected uio from NFS server");

/*
* Parse the stuff just read into the uio.
*/
dpStart = (struct dirent *)
((char *)uio->uio_iov->iov_base - (uio->uio_offset - off));
dpEnd = (struct dirent *) uio->uio_iov->iov_base;

/*
* Count number of entries.
*/
for (dp = dpStart, count = 0;
dp < dpEnd;
dp = (struct dirent *)((caddr_t) dp + dp->d_reclen))
count++;

cookiebuf = (u_int *) malloc(count * sizeof(u_int), M_TEMP, M_WAITOK);
for (dp = dpStart; cookiep = cookiebuf;
dp < dpEnd;
dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
off += dp->d_reclen;
*cookiep++ = (u_int) off;
}
*ncookies = count;
*cookies = cookiebuf;
}

if (eofflag && uio->uio_offset is past the end of the directory) {
*eofflag = TRUE;
}

SEE ALSO

AUTHORS