513 lines
10 KiB
C
513 lines
10 KiB
C
/*
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* $Id: isofs_vnops.c,v 1.4 1993/06/07 05:25:18 cgd Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "namei.h"
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#include "resourcevar.h"
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#include "kernel.h"
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#include "file.h"
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#include "stat.h"
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#include "buf.h"
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#include "proc.h"
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#include "conf.h"
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#include "mount.h"
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#include "vnode.h"
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#include "specdev.h"
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#include "fifo.h"
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#include "malloc.h"
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#include "dir.h"
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#include "iso.h"
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#include "isofs_node.h"
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/*
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* Open called.
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*
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* Nothing to do.
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*/
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/* ARGSUSED */
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isofs_open(vp, mode, cred, p)
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struct vnode *vp;
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int mode;
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struct ucred *cred;
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struct proc *p;
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{
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return (0);
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}
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/*
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* Close called
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*
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* Update the times on the inode on writeable file systems.
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*/
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/* ARGSUSED */
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isofs_close(vp, fflag, cred, p)
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struct vnode *vp;
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int fflag;
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struct ucred *cred;
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struct proc *p;
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{
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return (0);
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}
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/*
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* Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
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* The mode is shifted to select the owner/group/other fields. The
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* super user is granted all permissions.
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*/
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isofs_access(vp, mode, cred, p)
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struct vnode *vp;
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register int mode;
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struct ucred *cred;
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struct proc *p;
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{
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return (0);
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}
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/* ARGSUSED */
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isofs_getattr(vp, vap, cred, p)
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struct vnode *vp;
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register struct vattr *vap;
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struct ucred *cred;
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struct proc *p;
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{
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register struct iso_node *ip = VTOI(vp);
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int year, month, day, hour ,minute, second, tz;
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int crtime, days;
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int i;
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year = ip->iso_time[0] - 70;
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month = ip->iso_time[1];
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day = ip->iso_time[2];
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hour = ip->iso_time[3];
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minute = ip->iso_time[4];
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second = ip->iso_time[5];
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tz = ip->iso_time[6];
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if (year < 0) {
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crtime = 0;
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} else {
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int monlen[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
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days = year * 365;
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if (year > 2)
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days += (year+2) / 4;
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for (i = 1; i < month; i++)
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days += monlen[i-1];
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if (((year+2) % 4) == 0 && month > 2)
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days++;
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days += day - 1;
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crtime = ((((days * 24) + hour) * 60 + minute) * 60)
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+ second;
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/* sign extend */
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if (tz & 0x80)
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tz |= (-1 << 8);
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/* timezone offset is unreliable on some disks */
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if (-48 <= tz && tz <= 52)
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crtime += tz * 15 * 60;
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}
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vap->va_fsid = ip->i_dev;
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vap->va_fileid = ip->i_number;
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vap->va_mode = VREAD|VEXEC;
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vap->va_mode |= (vap->va_mode >> 3) | (vap->va_mode >> 6);
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if (vp->v_type == VDIR)
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vap->va_nlink = 2;
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else
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vap->va_nlink = 1;
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_rdev = 0;
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vap->va_size = ip->i_size;
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vap->va_size_rsv = 0;
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vap->va_atime.tv_sec = crtime;
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vap->va_atime.tv_usec = 0;
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vap->va_mtime.tv_sec = crtime;
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vap->va_mtime.tv_usec = 0;
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vap->va_ctime.tv_sec = crtime;
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vap->va_ctime.tv_usec = 0;
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vap->va_flags = 0;
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vap->va_gen = 1;
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vap->va_blocksize = ip->i_mnt->logical_block_size;
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vap->va_bytes = ip->i_size;
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vap->va_bytes_rsv = 0;
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vap->va_type = vp->v_type;
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return (0);
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}
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/*
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* Vnode op for reading.
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*/
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/* ARGSUSED */
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isofs_read(vp, uio, ioflag, cred)
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struct vnode *vp;
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register struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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register struct iso_node *ip = VTOI(vp);
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register struct iso_mnt *imp;
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struct buf *bp;
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daddr_t lbn, bn, rablock;
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int size, diff, error = 0;
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long n, on, type;
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#ifdef DIAGNOSTICx
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if (uio->uio_rw != UIO_READ)
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panic("isofs_read mode");
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type = ip->i_mode & IFMT;
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if (type != IFDIR && type != IFREG && type != IFLNK)
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panic("isofs_read type");
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#endif
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if (uio->uio_resid == 0)
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return (0);
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if (uio->uio_offset < 0)
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return (EINVAL);
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ip->i_flag |= IACC;
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imp = ip->i_mnt;
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do {
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lbn = iso_lblkno(imp, uio->uio_offset);
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on = iso_blkoff(imp, uio->uio_offset);
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n = MIN((unsigned)(imp->im_bsize - on), uio->uio_resid);
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diff = ip->i_size - uio->uio_offset;
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if (diff <= 0)
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return (0);
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if (diff < n)
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n = diff;
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size = iso_blksize(imp, ip, lbn);
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rablock = lbn + 1;
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if (vp->v_lastr + 1 == lbn &&
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iso_lblktosize(imp, rablock) < ip->i_size)
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error = breada(ITOV(ip), lbn, size, rablock,
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iso_blksize(imp, ip, rablock), NOCRED, &bp);
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else
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error = bread(ITOV(ip), lbn, size, NOCRED, &bp);
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vp->v_lastr = lbn;
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n = MIN(n, size - bp->b_resid);
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if (error) {
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brelse(bp);
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return (error);
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}
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error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
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if (n + on == imp->im_bsize || uio->uio_offset == ip->i_size)
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bp->b_flags |= B_AGE;
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brelse(bp);
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} while (error == 0 && uio->uio_resid > 0 && n != 0);
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return (error);
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}
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/* ARGSUSED */
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isofs_ioctl(vp, com, data, fflag, cred, p)
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struct vnode *vp;
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int com;
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caddr_t data;
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int fflag;
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struct ucred *cred;
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struct proc *p;
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{
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return (ENOTTY);
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}
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/* ARGSUSED */
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isofs_select(vp, which, fflags, cred, p)
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struct vnode *vp;
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int which, fflags;
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struct ucred *cred;
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struct proc *p;
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{
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/*
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* We should really check to see if I/O is possible.
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*/
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return (1);
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}
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/*
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* Mmap a file
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*
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* NB Currently unsupported.
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*/
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/* ARGSUSED */
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isofs_mmap(vp, fflags, cred, p)
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struct vnode *vp;
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int fflags;
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struct ucred *cred;
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struct proc *p;
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{
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return (EINVAL);
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}
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/*
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* Seek on a file
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*
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* Nothing to do, so just return.
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*/
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/* ARGSUSED */
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isofs_seek(vp, oldoff, newoff, cred)
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struct vnode *vp;
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off_t oldoff, newoff;
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struct ucred *cred;
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{
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return (0);
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}
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/*
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* Vnode op for readdir
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*/
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isofs_readdir(vp, uio, cred, eofflagp)
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struct vnode *vp;
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register struct uio *uio;
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struct ucred *cred;
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int *eofflagp;
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{
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struct dirent dirent;
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int iso_offset;
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int entryoffsetinblock;
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int error = 0;
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int endsearch;
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struct iso_directory_record *ep;
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int reclen;
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struct iso_mnt *imp;
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struct iso_node *ip;
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struct buf *bp = NULL;
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int i;
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int end_flag = 0;
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ip = VTOI (vp);
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imp = ip->i_mnt;
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iso_offset = uio->uio_offset;
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entryoffsetinblock = iso_blkoff(imp, iso_offset);
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if (entryoffsetinblock != 0) {
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if (error = iso_blkatoff(ip, iso_offset, (char **)0, &bp))
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return (error);
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}
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endsearch = ip->i_size;
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while (iso_offset < endsearch && uio->uio_resid > 0) {
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/*
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* If offset is on a block boundary,
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* read the next directory block.
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* Release previous if it exists.
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*/
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if (iso_blkoff(imp, iso_offset) == 0) {
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if (bp != NULL)
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brelse(bp);
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if (error = iso_blkatoff(ip, iso_offset,
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(char **)0, &bp))
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return (error);
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entryoffsetinblock = 0;
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}
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/*
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* Get pointer to next entry.
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*/
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ep = (struct iso_directory_record *)
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(bp->b_un.b_addr + entryoffsetinblock);
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reclen = isonum_711 (ep->length);
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if (reclen == 0) {
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/* skip to next block, if any */
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iso_offset = roundup (iso_offset,
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imp->logical_block_size);
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continue;
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}
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if (reclen < sizeof (struct iso_directory_record))
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/* illegal entry, stop */
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break;
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/* 10 Aug 92*/ if (entryoffsetinblock + reclen -1 >= imp->logical_block_size)
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/* illegal directory, so stop looking */
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break;
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dirent.d_fileno = isonum_733 (ep->extent);
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dirent.d_namlen = isonum_711 (ep->name_len);
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if (reclen < sizeof (struct iso_directory_record)
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+ dirent.d_namlen)
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/* illegal entry, stop */
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break;
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/*bcopy (ep->name, dirent.d_name, dirent.d_namlen);*/
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isofntrans(ep->name, dirent.d_namlen,
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dirent.d_name, &dirent.d_namlen);
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if (dirent.d_namlen == 1) {
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switch (dirent.d_name[0]) {
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case 0:
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dirent.d_name[0] = '.';
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break;
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case 1:
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dirent.d_name[0] = '.';
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dirent.d_name[1] = '.';
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dirent.d_namlen = 2;
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}
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}
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dirent.d_name[dirent.d_namlen] = 0;
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dirent.d_reclen = DIRSIZ (&dirent);
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if (uio->uio_resid < dirent.d_reclen)
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break;
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if (error = uiomove (&dirent, dirent.d_reclen, uio))
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break;
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iso_offset += reclen;
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entryoffsetinblock += reclen;
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}
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if (bp)
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brelse (bp);
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if (end_flag || (VTOI(vp)->i_size - iso_offset) <= 0)
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*eofflagp = 1;
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else
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*eofflagp = 0;
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uio->uio_offset = iso_offset;
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return (error);
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}
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/*
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* Ufs abort op, called after namei() when a CREATE/DELETE isn't actually
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* done. If a buffer has been saved in anticipation of a CREATE, delete it.
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*/
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/* ARGSUSED */
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isofs_abortop(ndp)
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struct nameidata *ndp;
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{
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if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF)
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FREE(ndp->ni_pnbuf, M_NAMEI);
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return (0);
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}
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/*
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* Lock an inode.
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*/
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isofs_lock(vp)
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struct vnode *vp;
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{
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register struct iso_node *ip = VTOI(vp);
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ISO_ILOCK(ip);
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return (0);
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}
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/*
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* Unlock an inode.
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*/
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isofs_unlock(vp)
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struct vnode *vp;
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{
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register struct iso_node *ip = VTOI(vp);
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if (!(ip->i_flag & ILOCKED))
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panic("isofs_unlock NOT LOCKED");
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ISO_IUNLOCK(ip);
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return (0);
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}
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/*
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* Check for a locked inode.
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*/
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isofs_islocked(vp)
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struct vnode *vp;
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{
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if (VTOI(vp)->i_flag & ILOCKED)
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return (1);
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return (0);
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}
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/*
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* Calculate the logical to physical mapping if not done already,
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* then call the device strategy routine.
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*/
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isofs_strategy(bp)
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register struct buf *bp;
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{
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register struct iso_node *ip = VTOI(bp->b_vp);
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struct vnode *vp;
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int error;
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if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
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panic("isofs_strategy: spec");
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if (bp->b_blkno == bp->b_lblkno) {
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if (error = iso_bmap(ip, bp->b_lblkno, &bp->b_blkno))
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return (error);
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if ((long)bp->b_blkno == -1)
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clrbuf(bp);
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}
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if ((long)bp->b_blkno == -1) {
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biodone(bp);
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return (0);
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}
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vp = ip->i_devvp;
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bp->b_dev = vp->v_rdev;
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(*(vp->v_op->vop_strategy))(bp);
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return (0);
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}
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/*
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* Print out the contents of an inode.
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*/
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isofs_print(vp)
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struct vnode *vp;
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{
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printf ("tag VT_ISOFS, isofs vnode\n");
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}
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extern int enodev ();
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/*
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* Global vfs data structures for isofs
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*/
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struct vnodeops isofs_vnodeops = {
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isofs_lookup, /* lookup */
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(void *)enodev, /* create */
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(void *)enodev, /* mknod */
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isofs_open, /* open */
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isofs_close, /* close */
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isofs_access, /* access */
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isofs_getattr, /* getattr */
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(void *)enodev, /* setattr */
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isofs_read, /* read */
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(void *)enodev, /* write */
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isofs_ioctl, /* ioctl */
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isofs_select, /* select */
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isofs_mmap, /* mmap */
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(void *)nullop, /* fsync */
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isofs_seek, /* seek */
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(void *)enodev, /* remove */
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(void *)enodev, /* link */
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(void *)enodev, /* rename */
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(void *)enodev, /* mkdir */
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(void *)enodev, /* rmdir */
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(void *)enodev, /* symlink */
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isofs_readdir, /* readdir */
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(void *)enodev, /* readlink */
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isofs_abortop, /* abortop */
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isofs_inactive, /* inactive */
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isofs_reclaim, /* reclaim */
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isofs_lock, /* lock */
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isofs_unlock, /* unlock */
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(void *)enodev, /* bmap */
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isofs_strategy, /* strategy */
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isofs_print, /* print */
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isofs_islocked, /* islocked */
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(void *)enodev, /* advlock */
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};
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