1608 lines
39 KiB
C
1608 lines
39 KiB
C
/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software,
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* just don't say you wrote it,
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* and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly
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* redistributed on the understanding that the author
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* is not responsible for the correct functioning of
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* this software in any circumstances and is not liable
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* for any damages caused by this software.
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*
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* October 1992
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*
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* $Id: pcfs_vnops.c,v 1.3 1993/05/20 03:34:24 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" /* defines plimit structure in proc struct */
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#include "kernel.h"
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#include "file.h" /* define FWRITE ... */
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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 "mount.h"
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#include "vnode.h"
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#include "specdev.h" /* defines plimit structure in the proc struct */
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#include "malloc.h"
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#include "dir.h" /* defines dirent structure */
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#include "bpb.h"
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#include "direntry.h"
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#include "denode.h"
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#include "pcfsmount.h"
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#include "fat.h"
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/*
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* Some general notes:
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*
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* In the ufs filesystem the inodes, superblocks, and indirect
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* blocks are read/written using the vnode for the filesystem.
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* Blocks that represent the contents of a file are read/written
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* using the vnode for the file (including directories when
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* they are read/written as files).
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* This presents problems for the dos filesystem because data
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* that should be in an inode (if dos had them) resides in the
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* directory itself. Since we must update directory entries
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* without the benefit of having the vnode for the directory
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* we must use the vnode for the filesystem. This means that
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* when a directory is actually read/written (via read, write,
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* or readdir, or seek) we must use the vnode for the filesystem
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* instead of the vnode for the directory as would happen in ufs.
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* This is to insure we retreive the correct block from the
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* buffer cache since the hash value is based upon the vnode
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* address and the desired block number.
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*/
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/*
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* Create a regular file.
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* On entry the directory to contain the file being
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* created is locked. We must release before we
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* return.
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* We must also free the pathname buffer pointed at
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* by ndp->ni_pnbuf, always on error, or only if the
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* SAVESTART bit in ni_nameiop is clear on success.
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*/
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int
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pcfs_create(ndp, vap, p)
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struct nameidata *ndp;
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struct vattr *vap;
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struct proc *p;
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{
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struct denode ndirent;
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struct direntry *ndirp = &ndirent.de_de;
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struct denode *dep;
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struct denode *pdep = VTODE(ndp->ni_dvp);
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int error;
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#if defined(PCFSDEBUG)
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printf("pcfs_create(ndp %08x, vap %08x, p %08x\n", ndp, vap, p);
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#endif /* defined(PCFSDEBUG) */
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/*
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* Create a directory entry for the file, then call
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* createde() to have it installed.
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* NOTE: DOS files are always executable. We use the
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* absence of the owner write bit to make the file readonly.
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*/
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bzero(&ndirent, sizeof(ndirent));
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unix2dostime(&time, (union dosdate *)&ndirp->deDate,
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(union dostime *)&ndirp->deTime);
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unix2dosfn((u_char *)ndp->ni_ptr, ndirp->deName, ndp->ni_namelen);
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ndirp->deAttributes = (vap->va_mode & VWRITE) ? 0 : ATTR_READONLY;
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ndirp->deStartCluster = 0;
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ndirp->deFileSize = 0;
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ndirent.de_pmp = pdep->de_pmp;
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ndirent.de_dev = pdep->de_dev;
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ndirent.de_devvp = pdep->de_devvp;
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if ((error = createde(&ndirent, ndp, &dep)) == 0) {
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ndp->ni_vp = DETOV(dep);
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if ((ndp->ni_nameiop & SAVESTART) == 0)
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free(ndp->ni_pnbuf, M_NAMEI);
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} else {
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free(ndp->ni_pnbuf, M_NAMEI);
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}
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deput(pdep); /* release parent dir */
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return error;
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}
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int
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pcfs_mknod(ndp, vap, cred, p)
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struct nameidata *ndp;
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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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int error;
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switch (vap->va_type) {
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case VDIR:
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error = pcfs_mkdir(ndp, vap, p);
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break;
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/*
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* pcfs_create() sets ndp->ni_vp.
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*/
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case VREG:
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error = pcfs_create(ndp, vap, p);
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break;
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default:
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error = EINVAL;
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break;
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}
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return error;
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}
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int
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pcfs_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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int
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pcfs_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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struct denode *dep = VTODE(vp);
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if (vp->v_usecount > 1 && !(dep->de_flag & DELOCKED))
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DETIMES(dep, &time);
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return 0;
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}
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int
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pcfs_access(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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int dosmode;
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struct denode *dep = VTODE(vp);
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/*
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* Root gets to do anything. Even execute a file
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* without the x-bit on? But, for dos filesystems
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* every file is executable. I may regret this.
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*/
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if (cred->cr_uid == 0)
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return 0;
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/*
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* mode is filled with a combination of VREAD, VWRITE,
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* and/or VEXEC bits turned on. In an octal number these
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* are the Y in 0Y00.
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*
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* Since the dos filesystem doesn't have the concept of
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* file ownership we just give everybody read and execute
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* access and write access if the readonly bit is off.
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*/
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dosmode = VEXEC | VREAD |
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((dep->de_Attributes & ATTR_READONLY) ? 0 : VWRITE);
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return ((dosmode & mode) != 0) ? 0 : EACCES;
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}
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int
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pcfs_getattr(vp, vap, cred, p)
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struct vnode *vp;
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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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u_int cn;
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struct denode *dep = VTODE(vp);
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DETIMES(dep, &time);
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vap->va_fsid = dep->de_dev;
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/* The following computation of the fileid must be the
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* same as that used in pcfs_readdir() to compute d_fileno.
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* If not, pwd doesn't work. */
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if (dep->de_Attributes & ATTR_DIRECTORY) {
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if ((cn = dep->de_StartCluster) == PCFSROOT)
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cn = 1;
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} else {
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if ((cn = dep->de_dirclust) == PCFSROOT)
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cn = 1;
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cn = (cn << 16) | (dep->de_diroffset & 0xffff);
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}
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vap->va_fileid = cn;
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vap->va_mode = (dep->de_Attributes & ATTR_READONLY) ? 0555 : 0777;
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if (dep->de_Attributes & ATTR_DIRECTORY)
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vap->va_mode |= S_IFDIR;
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vap->va_nlink = 1;
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vap->va_gid = 0;
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vap->va_uid = 0;
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vap->va_rdev = 0;
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vap->va_size = dep->de_FileSize;
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vap->va_size_rsv = 0;
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dos2unixtime((union dosdate *)&dep->de_Date,
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(union dostime *)&dep->de_Time, &vap->va_atime);
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vap->va_atime.tv_usec = 0;
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vap->va_mtime.tv_sec = vap->va_atime.tv_sec;
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vap->va_mtime.tv_usec = 0;
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vap->va_ctime.tv_sec = vap->va_atime.tv_sec;
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vap->va_ctime.tv_usec = 0;
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vap->va_flags = dep->de_flag;
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vap->va_gen = 0;
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vap->va_blocksize = dep->de_pmp->pm_bpcluster;
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vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) &
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~(dep->de_pmp->pm_crbomask);
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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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int
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pcfs_setattr(vp, vap, cred, p)
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struct vnode *vp;
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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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int error = 0;
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struct denode *dep = VTODE(vp);
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#if defined(PCFSDEBUG)
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printf("pcfs_setattr(): vp %08x, vap %08x, cred %08x, p %08x\n",
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vp, vap, cred, p);
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#endif /* defined(PCFSDEBUG) */
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if ((vap->va_type != VNON) ||
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(vap->va_nlink != VNOVAL) ||
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(vap->va_fsid != VNOVAL) ||
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(vap->va_fileid != VNOVAL) ||
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(vap->va_blocksize != VNOVAL) ||
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(vap->va_rdev != VNOVAL) ||
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(vap->va_bytes != VNOVAL) ||
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(vap->va_gen != VNOVAL) ||
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#if 0
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(vap->va_uid != (u_short)VNOVAL) ||
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(vap->va_gid != (u_short)VNOVAL) ||
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(vap->va_atime.tv_sec != VNOVAL) ||
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#endif
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0) {
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#if defined(PCFSDEBUG)
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printf("pcfs_setattr(): returning EINVAL\n");
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printf(" va_type %d, va_nlink %x, va_fsid %x, va_fileid %x\n",
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vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
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printf(" va_blocksize %x, va_rdev %x, va_bytes %x, va_gen %x\n",
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vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
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printf(" va_uid %x, va_gid %x, va_atime.tv_sec %x\n",
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vap->va_uid, vap->va_gid, vap->va_atime.tv_sec);
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#endif /* defined(PCFSDEBUG) */
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return EINVAL;
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}
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if (vap->va_size != VNOVAL) {
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if (vp->v_type == VDIR)
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return EISDIR;
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if (error = detrunc(dep, vap->va_size, 0))
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return error;
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}
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if (vap->va_mtime.tv_sec != VNOVAL) {
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dep->de_flag |= DEUPD;
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if (error = deupdat(dep, &vap->va_mtime, 1))
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return error;
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}
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/*
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* DOS files only have the ability to have thier
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* writability attribute set, so we use the owner
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* write bit to set the readonly attribute.
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*/
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if (vap->va_mode != (u_short)VNOVAL) {
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/* We ignore the read and execute bits */
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if (vap->va_mode & VWRITE)
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dep->de_Attributes &= ~ATTR_READONLY;
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else
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dep->de_Attributes |= ATTR_READONLY;
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dep->de_flag |= DEUPD;
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}
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if (vap->va_flags != VNOVAL) {
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if (error = suser(cred, &p->p_acflag))
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return error;
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if (cred->cr_uid == 0)
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dep->de_flag = vap->va_flags;
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else {
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dep->de_flag &= 0xffff0000;
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dep->de_flag |= (vap->va_flags & 0xffff);
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}
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dep->de_flag |= DEUPD;
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}
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return error;
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}
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int
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pcfs_read(vp, uio, ioflag, cred)
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struct vnode *vp;
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struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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int error = 0;
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int diff;
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int isadir;
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long n;
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long on;
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daddr_t bn;
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daddr_t lbn;
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daddr_t rablock;
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struct buf *bp;
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struct denode *dep = VTODE(vp);
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struct pcfsmount *pmp = dep->de_pmp;
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/*
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* If they didn't ask for any data, then we
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* are done.
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*/
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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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isadir = dep->de_Attributes & ATTR_DIRECTORY;
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do {
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lbn = uio->uio_offset >> pmp->pm_cnshift;
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on = uio->uio_offset & pmp->pm_crbomask;
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n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid);
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diff = dep->de_FileSize - uio->uio_offset;
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if (diff <= 0)
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return 0;
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/* convert cluster # to block # if a directory */
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if (isadir) {
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error = pcbmap(dep, lbn, &lbn, 0);
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if (error)
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return error;
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}
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if (diff < n)
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n = diff;
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/*
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* If we are operating on a directory file then be
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* sure to do i/o with the vnode for the filesystem
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* instead of the vnode for the directory.
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*/
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if (isadir) {
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error = bread(pmp->pm_devvp, lbn, pmp->pm_bpcluster,
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NOCRED, &bp);
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} else {
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rablock = lbn + 1;
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if (vp->v_lastr + 1 == lbn &&
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rablock * pmp->pm_bpcluster < dep->de_FileSize) {
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error = breada(vp, lbn, pmp->pm_bpcluster,
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rablock, pmp->pm_bpcluster, NOCRED, &bp);
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} else {
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error = bread(vp, lbn, pmp->pm_bpcluster, NOCRED,
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&bp);
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}
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vp->v_lastr = lbn;
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}
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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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n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
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error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
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/*
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* If we have read everything from this block or
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* have read to end of file then we are done with
|
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* this block. Mark it to say the buffer can be reused if
|
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* need be.
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*/
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#if 0
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if (n + on == pmp->pm_bpcluster ||
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uio->uio_offset == dep->de_FileSize)
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bp->b_flags |= B_AGE;
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#endif
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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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/*
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* Write data to a file or directory.
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*/
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int
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pcfs_write(vp, uio, ioflag, cred)
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struct vnode *vp;
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struct uio *uio;
|
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int ioflag;
|
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struct ucred *cred;
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{
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int n;
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int croffset;
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int resid;
|
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int osize;
|
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int error;
|
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u_long cluster;
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u_long nextcluster;
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u_long lastcluster;
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daddr_t bn;
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struct buf *bp;
|
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struct proc *p = uio->uio_procp;
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struct denode *dep = VTODE(vp);
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struct pcfsmount *pmp = dep->de_pmp;
|
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|
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#if defined(PCFSDEBUG)
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printf("pcfs_write(vp %08x, uio %08x, ioflag %08x, cred %08x\n",
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vp, uio, ioflag, cred);
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printf("pcfs_write(): diroff %d, dirclust %d, startcluster %d\n",
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dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
|
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#endif /* defined(PCFSDEBUG) */
|
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|
|
switch (vp->v_type) {
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case VREG:
|
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if (ioflag & IO_APPEND)
|
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uio->uio_offset = dep->de_FileSize;
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break;
|
|
|
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case VDIR:
|
|
/* In pcfs, directory updates don't use pcfs_write */
|
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panic("pcfs_write(): directory update");
|
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break;
|
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|
|
default:
|
|
panic("pcfs_write(): bad file type");
|
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break;
|
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}
|
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|
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if (uio->uio_offset < 0)
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return EINVAL;
|
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if (uio->uio_resid == 0)
|
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return 0;
|
|
|
|
/*
|
|
* If they've exceeded their filesize limit, tell them about it.
|
|
*/
|
|
if (vp->v_type == VREG && p &&
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((uio->uio_offset + uio->uio_resid) >
|
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p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
|
|
psignal(p, SIGXFSZ);
|
|
return EFBIG;
|
|
}
|
|
|
|
/*
|
|
* If the offset we are starting the write at is beyond the
|
|
* end of the file, then they've done a seek. Unix filesystems
|
|
* allow files with holes in them, DOS doesn't so we must
|
|
* fill the hole with zeroed blocks.
|
|
*/
|
|
if (uio->uio_offset > dep->de_FileSize) {
|
|
error = pcfsextend(vp, uio->uio_offset);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Remember some values in case the write fails.
|
|
*/
|
|
resid = uio->uio_resid;
|
|
osize = dep->de_FileSize;
|
|
|
|
do {
|
|
bn = uio->uio_offset >> pmp->pm_cnshift;
|
|
croffset = uio->uio_offset & pmp->pm_crbomask;
|
|
n = MIN(uio->uio_resid, pmp->pm_bpcluster-croffset);
|
|
/*
|
|
* If we are appending to the file and we are on a
|
|
* cluster boundary, then allocate a new cluster
|
|
* and chain it onto the file.
|
|
*/
|
|
if (uio->uio_offset == dep->de_FileSize &&
|
|
(uio->uio_offset & pmp->pm_crbomask) == 0) {
|
|
if (error = extendfile(dep, &bp, 0))
|
|
break;
|
|
} else {
|
|
/*
|
|
* The block we need to write into exists,
|
|
* so just read it in.
|
|
*/
|
|
if (n == pmp->pm_bpcluster)
|
|
/* We will overwrite the whole block, so
|
|
* dont read it*/
|
|
bp = getblk(vp, bn, pmp->pm_bpcluster);
|
|
else {
|
|
error = bread(vp, bn, pmp->pm_bpcluster, cred, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return error;
|
|
}
|
|
}
|
|
}
|
|
if (uio->uio_offset+n > dep->de_FileSize) {
|
|
dep->de_FileSize = uio->uio_offset + n;
|
|
vnode_pager_setsize(vp, dep->de_FileSize);
|
|
}
|
|
(void) vnode_pager_uncache(vp);
|
|
|
|
/*
|
|
* Copy the data from user space into the buf header.
|
|
*/
|
|
error = uiomove(bp->b_un.b_addr+croffset, n, uio);
|
|
|
|
/*
|
|
* If they want this synchronous then write it and wait
|
|
* for it. Otherwise, if on a cluster boundary write it
|
|
* asynchronously so we can move on to the next block
|
|
* without delay. Otherwise do a delayed write because
|
|
* we may want to write somemore into the block later.
|
|
*/
|
|
if (ioflag & IO_SYNC)
|
|
(void) bwrite(bp);
|
|
else
|
|
if (n + croffset == pmp->pm_bpcluster) {
|
|
bp->b_flags |= B_AGE;
|
|
bawrite(bp);
|
|
} else
|
|
bdwrite(bp);
|
|
dep->de_flag |= DEUPD;
|
|
} while (error == 0 && uio->uio_resid > 0);
|
|
|
|
/*
|
|
* If the write failed and they want us to, truncate
|
|
* the file back to the size it was before the write
|
|
* was attempted.
|
|
*/
|
|
if (error && (ioflag & IO_UNIT)) {
|
|
detrunc(dep, osize, ioflag & IO_SYNC);
|
|
uio->uio_offset -= resid - uio->uio_resid;
|
|
uio->uio_resid = resid;
|
|
}
|
|
if (!error && (ioflag & IO_UNIT))
|
|
error = deupdat(dep, &time, 1);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
pcfs_ioctl(vp, com, data, fflag, cred, p)
|
|
struct vnode *vp;
|
|
int com;
|
|
caddr_t data;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
return ENOTTY;
|
|
}
|
|
|
|
int
|
|
pcfs_select(vp, which, fflags, cred, p)
|
|
struct vnode *vp;
|
|
int which;
|
|
int fflags;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
return 1; /* DOS filesystems never block? */
|
|
}
|
|
|
|
int
|
|
pcfs_mmap(vp, fflags, cred, p)
|
|
struct vnode *vp;
|
|
int fflags;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Flush the blocks of a file to disk.
|
|
*
|
|
* This function is worthless for vnodes that represent
|
|
* directories.
|
|
* Maybe we could just do a sync if they try an fsync
|
|
* on a directory file.
|
|
*/
|
|
int
|
|
pcfs_fsync(vp, fflags, cred, waitfor, p)
|
|
struct vnode *vp;
|
|
int fflags;
|
|
struct ucred *cred;
|
|
int waitfor;
|
|
struct proc *p;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
if (fflags & FWRITE)
|
|
dep->de_flag |= DEUPD;
|
|
|
|
vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0);
|
|
return deupdat(dep, &time, waitfor == MNT_WAIT);
|
|
}
|
|
|
|
/*
|
|
* Since the dos filesystem does not allow files with
|
|
* holes in them we must fill the file with zeroed
|
|
* blocks when a write past the end of file happens.
|
|
*/
|
|
int
|
|
pcfsextend(vp, newoff)
|
|
struct vnode *vp;
|
|
off_t newoff;
|
|
{
|
|
int error = 0;
|
|
off_t foff;
|
|
struct buf *bp;
|
|
struct denode *dep = VTODE(vp);
|
|
struct pcfsmount *pmp = dep->de_pmp;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (dep->de_Attributes & ATTR_DIRECTORY)
|
|
/* should not happen */
|
|
return EISDIR;
|
|
#endif
|
|
|
|
/*
|
|
* Compute the offset of the first byte after the
|
|
* last block in the file.
|
|
* If writing beyond the end of file then fill the
|
|
* file with zeroed blocks up to the seek address.
|
|
*/
|
|
foff = (dep->de_FileSize + (pmp->pm_bpcluster-1)) & ~pmp->pm_crbomask;
|
|
if (newoff <= foff)
|
|
return 0;
|
|
|
|
/*
|
|
* Allocate and chain together as many clusters as
|
|
* are needed to get to newoff.
|
|
*/
|
|
while (foff < newoff) {
|
|
if (error = extendfile(dep, &bp, 0))
|
|
return error;
|
|
bdwrite(bp);
|
|
foff += pmp->pm_bpcluster;
|
|
dep->de_FileSize += pmp->pm_bpcluster;
|
|
}
|
|
dep->de_FileSize = newoff;
|
|
dep->de_flag |= DEUPD;
|
|
return deupdat(dep, &time);
|
|
}
|
|
|
|
/*
|
|
* Seek on a file
|
|
*
|
|
* Nothing to do, so just return.
|
|
*/
|
|
int
|
|
pcfs_seek(vp, oldoff, newoff, cred)
|
|
struct vnode *vp;
|
|
off_t oldoff;
|
|
off_t newoff;
|
|
struct ucred *cred;
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pcfs_remove(ndp, p)
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
struct denode *dep = VTODE(ndp->ni_vp);
|
|
struct denode *ddep = VTODE(ndp->ni_dvp);
|
|
|
|
error = removede(ndp);
|
|
#if defined(PCFSDEBUG)
|
|
printf("pcfs_remove(), dep %08x, v_usecount %d\n", dep, ndp->ni_vp->v_usecount);
|
|
#endif /* defined(PCFSDEBUG) */
|
|
if (ddep == dep)
|
|
vrele(DETOV(dep));
|
|
else
|
|
deput(dep); /* causes pcfs_inactive() to be called via vrele() */
|
|
deput(ddep);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* DOS filesystems don't know what links are.
|
|
*/
|
|
int
|
|
pcfs_link(vp, ndp, p)
|
|
struct vnode *vp;
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Renames on files require moving the denode to
|
|
* a new hash queue since the denode's location is
|
|
* used to compute which hash queue to put the file in.
|
|
* Unless it is a rename in place. For example "mv a b".
|
|
*
|
|
* What follows is the basic algorithm:
|
|
*
|
|
* if (file move) {
|
|
* if (dest file exists) {
|
|
* remove dest file
|
|
* }
|
|
* if (dest and src in same directory) {
|
|
* rewrite name in existing directory slot
|
|
* } else {
|
|
* write new entry in dest directory
|
|
* update offset and dirclust in denode
|
|
* move denode to new hash chain
|
|
* clear old directory entry
|
|
* }
|
|
* } else { directory move
|
|
* if (dest directory exists) {
|
|
* if (dest is not empty) {
|
|
* return ENOTEMPTY
|
|
* }
|
|
* remove dest directory
|
|
* }
|
|
* if (dest and src in same directory) {
|
|
* rewrite name in existing entry
|
|
* } else {
|
|
* be sure dest is not a child of src directory
|
|
* write entry in dest directory
|
|
* update "." and ".." in moved directory
|
|
* update offset and dirclust in denode
|
|
* move denode to new hash chain
|
|
* clear old directory entry for moved directory
|
|
* }
|
|
* }
|
|
*
|
|
* On entry:
|
|
* source's parent directory is unlocked
|
|
* source file or directory is unlocked
|
|
* destination's parent directory is locked
|
|
* destination file or directory is locked if it exists
|
|
*
|
|
* On exit:
|
|
* all denodes should be released
|
|
* Notes:
|
|
* I'm not sure how the memory containing the pathnames
|
|
* pointed at by the nameidata structures is freed, there
|
|
* may be some memory bleeding for each rename done.
|
|
*/
|
|
int
|
|
pcfs_rename(fndp, tndp, p)
|
|
struct nameidata *fndp;
|
|
struct nameidata *tndp;
|
|
struct proc *p;
|
|
{
|
|
u_char toname[11];
|
|
int error;
|
|
int newparent = 0;
|
|
int sourceisadirectory = 0;
|
|
u_long to_dirclust;
|
|
u_long to_diroffset;
|
|
u_long cn;
|
|
daddr_t bn;
|
|
struct denode *fddep; /* from file's parent directory */
|
|
struct denode *fdep; /* from file or directory */
|
|
struct denode *tddep; /* to file's parent directory */
|
|
struct denode *tdep; /* to file or directory */
|
|
struct pcfsmount *pmp;
|
|
struct direntry *dotdotp;
|
|
struct direntry *ep;
|
|
struct buf *bp;
|
|
|
|
#if defined(PCFSDEBUG)
|
|
printf("pcfs_rename(fndp %08x, tndp %08x, p %08x\n", fndp, tndp, p);
|
|
#endif /* defined(PCFSDEBUG) */
|
|
fddep = VTODE(fndp->ni_dvp);
|
|
fdep = VTODE(fndp->ni_vp);
|
|
tddep = VTODE(tndp->ni_dvp);
|
|
tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL;
|
|
pmp = fddep->de_pmp;
|
|
|
|
/*
|
|
* Convert the filename in tdnp into a dos filename.
|
|
* We copy this into the denode and directory entry
|
|
* for the destination file/directory.
|
|
*/
|
|
unix2dosfn((u_char *)tndp->ni_ptr, toname, tndp->ni_namelen);
|
|
|
|
/*
|
|
* At this point this is the lock state of the denodes:
|
|
* fddep referenced
|
|
* fdep referenced
|
|
* tddep locked
|
|
* tdep locked if it exists
|
|
*/
|
|
|
|
/*
|
|
* Be sure we are not renaming ".", "..", or an alias of ".".
|
|
* This leads to a crippled directory tree. It's pretty tough
|
|
* to do a "ls" or "pwd" with the "." directory entry missing,
|
|
* and "cd .." doesn't work if the ".." entry is missing.
|
|
*/
|
|
if (fdep->de_Attributes & ATTR_DIRECTORY) {
|
|
if ((fndp->ni_namelen == 1 && fndp->ni_ptr[0] == '.') ||
|
|
fddep == fdep || /* won't happen ? */
|
|
fndp->ni_isdotdot) {
|
|
VOP_ABORTOP(tndp);
|
|
vput(tndp->ni_dvp);
|
|
if (tndp->ni_vp)
|
|
vput(tndp->ni_vp);
|
|
VOP_ABORTOP(fndp);
|
|
vrele(fndp->ni_dvp);
|
|
vrele(fndp->ni_vp);
|
|
return EINVAL;
|
|
}
|
|
sourceisadirectory = 1;
|
|
}
|
|
|
|
/*
|
|
* If we are renaming a directory, and the directory
|
|
* is being moved to another directory, then we must
|
|
* be sure the destination directory is not in the
|
|
* subtree of the source directory. This could orphan
|
|
* everything under the source directory.
|
|
* doscheckpath() unlocks the destination's parent
|
|
* directory so we must look it up again to relock it.
|
|
*/
|
|
if (fddep->de_StartCluster != tddep->de_StartCluster)
|
|
newparent = 1;
|
|
if (sourceisadirectory && newparent) {
|
|
if (tdep) {
|
|
deput(tdep);
|
|
tdep = NULL;
|
|
}
|
|
/* doscheckpath() deput()'s tddep */
|
|
error = doscheckpath(fdep, tddep, tndp->ni_cred);
|
|
tddep = NULL;
|
|
if (error)
|
|
goto bad;
|
|
if ((tndp->ni_nameiop & SAVESTART) == 0)
|
|
panic("pcfs_rename(): lost to startdir");
|
|
if (error = lookup(tndp, p))
|
|
goto bad;
|
|
tddep = VTODE(tndp->ni_dvp);
|
|
tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL;
|
|
}
|
|
|
|
/*
|
|
* If the destination exists, then be sure its type (file or dir)
|
|
* matches that of the source. And, if it is a directory make
|
|
* sure it is empty. Then delete the destination.
|
|
*/
|
|
if (tdep) {
|
|
if (tdep->de_Attributes & ATTR_DIRECTORY) {
|
|
if (!sourceisadirectory) {
|
|
error = ENOTDIR;
|
|
goto bad;
|
|
}
|
|
if (!dosdirempty(tdep)) {
|
|
error = ENOTEMPTY;
|
|
goto bad;
|
|
}
|
|
} else { /* destination is file */
|
|
if (sourceisadirectory) {
|
|
error = EISDIR;
|
|
goto bad;
|
|
}
|
|
}
|
|
to_dirclust = tdep->de_dirclust;
|
|
to_diroffset = tdep->de_diroffset;
|
|
if (error = removede(tndp))
|
|
goto bad;
|
|
deput(tdep);
|
|
tdep = NULL;
|
|
|
|
/*
|
|
* Remember where the slot was for createde().
|
|
*/
|
|
tndp->ni_pcfs.pcfs_count = 1;
|
|
tndp->ni_pcfs.pcfs_cluster = to_dirclust;
|
|
tndp->ni_pcfs.pcfs_offset = to_diroffset;
|
|
}
|
|
|
|
/*
|
|
* If the source and destination are in the same
|
|
* directory then just read in the directory entry,
|
|
* change the name in the directory entry and
|
|
* write it back to disk.
|
|
*/
|
|
if (newparent == 0) {
|
|
/* tddep and fddep point to the same denode here */
|
|
DELOCK(fdep); /* tddep is already locked */
|
|
if (error = readde(fdep, &bp, &ep)) {
|
|
DEUNLOCK(fdep);
|
|
goto bad;
|
|
}
|
|
bcopy(toname, ep->deName, 11);
|
|
if (error = bwrite(bp)) {
|
|
DEUNLOCK(fdep);
|
|
goto bad;
|
|
}
|
|
bcopy(toname, fdep->de_Name, 11); /* update denode */
|
|
/*
|
|
* fdep locked
|
|
* fddep and tddep point to the same denode which is locked
|
|
* tdep is unlocked and unreferenced
|
|
*/
|
|
} else {
|
|
u_long dirsize;
|
|
/*
|
|
* If the source and destination are in different
|
|
* directories, then mark the entry in the source
|
|
* directory as deleted and write a new entry in the
|
|
* destination directory. Then move the denode to
|
|
* the correct hash chain for its new location in
|
|
* the filesystem. And, if we moved a directory,
|
|
* then update its .. entry to point to the new
|
|
* parent directory.
|
|
* If we moved a directory will also insure that
|
|
* the directory entry on disk has a filesize of
|
|
* zero.
|
|
*/
|
|
DELOCK(fdep);
|
|
bcopy(toname, fdep->de_Name, 11); /* update denode */
|
|
if (fdep->de_Attributes & ATTR_DIRECTORY) {
|
|
dirsize = fdep->de_FileSize;
|
|
fdep->de_FileSize = 0;
|
|
}
|
|
error = createde(fdep, tndp, (struct denode **)0);
|
|
if (fdep->de_Attributes & ATTR_DIRECTORY) {
|
|
fdep->de_FileSize = dirsize;
|
|
}
|
|
if (error) {
|
|
/* should put back filename */
|
|
DEUNLOCK(fdep);
|
|
goto bad;
|
|
}
|
|
DELOCK(fddep);
|
|
error = markdeleted (pmp,
|
|
fndp->ni_pcfs.pcfs_cluster,
|
|
fndp->ni_pcfs.pcfs_offset);
|
|
if (error) {
|
|
DEUNLOCK(fdep);
|
|
DEUNLOCK(fddep);
|
|
goto bad;
|
|
}
|
|
if (!(fdep->de_Attributes & ATTR_DIRECTORY)) {
|
|
fdep->de_dirclust = tndp->ni_pcfs.pcfs_cluster;
|
|
fdep->de_diroffset = tndp->ni_pcfs.pcfs_offset;
|
|
reinsert(fdep);
|
|
}
|
|
DEUNLOCK(fddep);
|
|
}
|
|
/* fdep is still locked here */
|
|
|
|
/*
|
|
* If we moved a directory to a new parent directory,
|
|
* then we must fixup the ".." entry in the moved
|
|
* directory.
|
|
*/
|
|
if (sourceisadirectory && newparent) {
|
|
cn = fdep->de_StartCluster;
|
|
if (cn == PCFSROOT)
|
|
/* this should never happen */
|
|
panic("pcfs_rename(): updating .. in root directory?\n");
|
|
error = readep(pmp, cn, 1, &bp, &dotdotp);
|
|
if (error) {
|
|
/* should really panic here, fs is corrupt */
|
|
DEUNLOCK(fdep);
|
|
goto bad;
|
|
}
|
|
dotdotp->deStartCluster = tddep->de_StartCluster;
|
|
error = bwrite(bp);
|
|
DEUNLOCK(fdep);
|
|
if (error)
|
|
/* should really panic here, fs is corrupt */
|
|
goto bad;
|
|
}
|
|
else
|
|
DEUNLOCK(fdep);
|
|
bad:;
|
|
vrele(DETOV(fdep));
|
|
vrele(DETOV(fddep));
|
|
if (tdep)
|
|
vput(DETOV(tdep));
|
|
if (tddep)
|
|
vput(DETOV(tddep));
|
|
return error;
|
|
}
|
|
|
|
struct {
|
|
struct direntry dot;
|
|
struct direntry dotdot;
|
|
} dosdirtemplate = {
|
|
". ", " ", /* the . entry */
|
|
ATTR_DIRECTORY, /* file attribute */
|
|
0,0,0,0,0,0,0,0,0,0, /* resevered */
|
|
1234, 1234, /* time and date */
|
|
0, /* startcluster */
|
|
0, /* filesize */
|
|
".. ", " ", /* the .. entry */
|
|
ATTR_DIRECTORY, /* file attribute */
|
|
0,0,0,0,0,0,0,0,0,0, /* resevered */
|
|
1234, 1234, /* time and date */
|
|
0, /* startcluster */
|
|
0, /* filesize */
|
|
};
|
|
|
|
int
|
|
pcfs_mkdir(ndp, vap, p)
|
|
struct nameidata *ndp;
|
|
struct vattr *vap;
|
|
struct proc *p;
|
|
{
|
|
int bn;
|
|
int error;
|
|
u_long newcluster;
|
|
struct denode *pdep;
|
|
struct denode *ndep;
|
|
struct vnode *pvp;
|
|
struct direntry *denp;
|
|
struct denode ndirent;
|
|
struct pcfsmount *pmp;
|
|
struct buf *bp;
|
|
|
|
pvp = ndp->ni_dvp;
|
|
pdep = VTODE(pvp);
|
|
|
|
/*
|
|
* If this is the root directory and there is no space left
|
|
* we can't do anything. This is because the root directory
|
|
* can not change size.
|
|
*/
|
|
if (pdep->de_StartCluster == PCFSROOT && ndp->ni_pcfs.pcfs_count == 0) {
|
|
free(ndp->ni_pnbuf, M_NAMEI);
|
|
deput(pdep);
|
|
return ENOSPC;
|
|
}
|
|
|
|
pmp = pdep->de_pmp;
|
|
|
|
/*
|
|
* Allocate a cluster to hold the about to be created directory.
|
|
*/
|
|
if (error = clusteralloc(pmp, &newcluster, CLUST_EOFE)) {
|
|
free(ndp->ni_pnbuf, M_NAMEI);
|
|
deput(pdep);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Now fill the cluster with the "." and ".." entries.
|
|
* And write the cluster to disk. This way it is there
|
|
* for the parent directory to be pointing at if there
|
|
* were a crash.
|
|
*/
|
|
bn = cntobn(pmp, newcluster);
|
|
bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster); /* always succeeds */
|
|
clrbuf(bp);
|
|
bcopy(&dosdirtemplate, bp->b_un.b_addr, sizeof dosdirtemplate);
|
|
denp = (struct direntry *)bp->b_un.b_addr;
|
|
denp->deStartCluster = newcluster;
|
|
unix2dostime(&time, (union dosdate *)&denp->deDate,
|
|
(union dostime *)&denp->deTime);
|
|
denp++;
|
|
denp->deStartCluster = pdep->de_StartCluster;
|
|
unix2dostime(&time, (union dosdate *)&denp->deDate,
|
|
(union dostime *)&denp->deTime);
|
|
if (error = bwrite(bp)) {
|
|
clusterfree(pmp, newcluster, NULL);
|
|
free(ndp->ni_pnbuf, M_NAMEI);
|
|
deput(pdep);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Now build up a directory entry pointing to the newly
|
|
* allocated cluster. This will be written to an empty
|
|
* slot in the parent directory.
|
|
*/
|
|
ndep = &ndirent;
|
|
bzero(ndep, sizeof(*ndep));
|
|
unix2dosfn((u_char *)ndp->ni_ptr, ndep->de_Name, ndp->ni_namelen);
|
|
unix2dostime(&time, (union dosdate *)&ndep->de_Date,
|
|
(union dostime *)&ndep->de_Time);
|
|
ndep->de_StartCluster = newcluster;
|
|
ndep->de_Attributes = ATTR_DIRECTORY;
|
|
ndep->de_pmp = pmp; /* createde() needs this */
|
|
|
|
error = createde(ndep, ndp, &ndep);
|
|
if (error) {
|
|
clusterfree(pmp, newcluster, NULL);
|
|
} else {
|
|
ndp->ni_vp = DETOV(ndep);
|
|
}
|
|
free(ndp->ni_pnbuf, M_NAMEI);
|
|
#if defined(PCFSDEBUG)
|
|
printf("pcfs_mkdir(): deput(%08x), vnode %08x\n", pdep, DETOV(pdep));
|
|
#endif /* defined(PCFSDEBUG) */
|
|
deput(pdep);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
pcfs_rmdir(ndp, p)
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
struct denode *ddep;
|
|
struct denode *dep;
|
|
int error = 0;
|
|
|
|
ddep = VTODE(ndp->ni_dvp); /* parent dir of dir to delete */
|
|
dep = VTODE(ndp->ni_vp); /* directory to delete */
|
|
|
|
/*
|
|
* Don't let "rmdir ." go thru.
|
|
*/
|
|
if (ddep == dep) {
|
|
vrele(DETOV(dep));
|
|
deput(dep);
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Be sure the directory being deleted is empty.
|
|
*/
|
|
if (dosdirempty(dep) == 0) {
|
|
error = ENOTEMPTY;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Delete the entry from the directory. For dos filesystems
|
|
* this gets rid of the directory entry on disk, the in memory
|
|
* copy still exists but the de_refcnt is <= 0. This prevents
|
|
* it from being found by deget(). When the deput() on dep is
|
|
* done we give up access and eventually pcfs_reclaim() will
|
|
* be called which will remove it from the denode cache.
|
|
*/
|
|
if (error = removede(ndp))
|
|
goto out;
|
|
|
|
/*
|
|
* This is where we decrement the link count in the parent
|
|
* directory. Since dos filesystems don't do this we just
|
|
* purge the name cache and let go of the parent directory
|
|
* denode.
|
|
*/
|
|
cache_purge(DETOV(ddep));
|
|
deput(ddep);
|
|
ndp->ni_dvp = NULL; /* getting rid of parent dir pointer? */
|
|
|
|
/*
|
|
* Truncate the directory that is being deleted.
|
|
*/
|
|
error = detrunc(dep, (u_long)0, IO_SYNC);
|
|
cache_purge(DETOV(dep));
|
|
|
|
out:;
|
|
if (ndp->ni_dvp)
|
|
deput(ddep);
|
|
deput(dep);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* DOS filesystems don't know what symlinks are.
|
|
*/
|
|
int
|
|
pcfs_symlink(ndp, vap, target, p)
|
|
struct nameidata *ndp;
|
|
struct vattr *vap;
|
|
char *target;
|
|
struct proc *p;
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Dummy dirents to simulate the "." and ".." entries
|
|
* of the root directory in a dos filesystem. Dos doesn't
|
|
* provide these.
|
|
* Note that each entry must be the same size as a dos
|
|
* directory entry (32 bytes).
|
|
*/
|
|
struct dos_dirent {
|
|
u_long d_fileno;
|
|
u_short d_reclen;
|
|
u_short d_namlen;
|
|
u_char d_name[24];
|
|
} rootdots[2] = {
|
|
{
|
|
1, /* d_fileno */
|
|
sizeof(struct direntry), /* d_reclen */
|
|
1, /* d_namlen */
|
|
"." /* d_name */
|
|
},
|
|
{
|
|
1, /* d_fileno */
|
|
sizeof(struct direntry), /* d_reclen */
|
|
2, /* d_namlen */
|
|
".." /* d_name */
|
|
}
|
|
};
|
|
|
|
int
|
|
pcfs_readdir(vp, uio, cred, eofflagp)
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
int *eofflagp;
|
|
{
|
|
int error = 0;
|
|
int diff;
|
|
char pushout;
|
|
long n;
|
|
long on;
|
|
long lost;
|
|
long count;
|
|
u_long cn;
|
|
u_long fileno;
|
|
long bias = 0;
|
|
daddr_t bn;
|
|
daddr_t lbn;
|
|
struct buf *bp;
|
|
struct denode *dep = VTODE(vp);
|
|
struct pcfsmount *pmp = dep->de_pmp;
|
|
struct direntry *dentp;
|
|
struct dirent *prev;
|
|
struct dirent *crnt;
|
|
u_char dirbuf[512]; /* holds converted dos directories */
|
|
int i=0;
|
|
|
|
#if defined(PCFSDEBUG)
|
|
printf("pcfs_readdir(): vp %08x, uio %08x, cred %08x, eofflagp %08x\n",
|
|
vp, uio, cred, eofflagp);
|
|
#endif /* defined(PCFSDEBUG) */
|
|
|
|
/*
|
|
* pcfs_readdir() won't operate properly on regular files
|
|
* since it does i/o only with the the filesystem vnode,
|
|
* and hence can retrieve the wrong block from the buffer
|
|
* cache for a plain file. So, fail attempts to readdir()
|
|
* on a plain file.
|
|
*/
|
|
if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
|
|
return ENOTDIR;
|
|
|
|
/*
|
|
* If the user buffer is smaller than the size of one dos
|
|
* directory entry or the file offset is not a multiple of
|
|
* the size of a directory entry, then we fail the read.
|
|
*/
|
|
count = uio->uio_resid & ~(sizeof(struct direntry)-1);
|
|
lost = uio->uio_resid - count;
|
|
if (count < sizeof(struct direntry) ||
|
|
(uio->uio_offset & (sizeof(struct direntry)-1)))
|
|
return EINVAL;
|
|
uio->uio_resid = count;
|
|
uio->uio_iov->iov_len = count;
|
|
|
|
/*
|
|
* If they are reading from the root directory then,
|
|
* we simulate the . and .. entries since these don't
|
|
* exist in the root directory. We also set the offset
|
|
* bias to make up for having to simulate these entries.
|
|
* By this I mean that at file offset 64 we read the first entry
|
|
* in the root directory that lives on disk.
|
|
*/
|
|
if (dep->de_StartCluster == PCFSROOT) {
|
|
/*printf("pcfs_readdir(): going after . or .. in root dir, offset %d\n",
|
|
uio->uio_offset);*/
|
|
bias = 2*sizeof(struct direntry);
|
|
if (uio->uio_offset < 2*sizeof(struct direntry)) {
|
|
error = uiomove((char *)rootdots + uio->uio_offset,
|
|
sizeof rootdots - uio->uio_offset, uio);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
}
|
|
do {
|
|
lbn = (uio->uio_offset-bias) >> pmp->pm_cnshift;
|
|
on = (uio->uio_offset-bias) & pmp->pm_crbomask;
|
|
n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid);
|
|
diff = dep->de_FileSize - (uio->uio_offset - bias);
|
|
if (diff <= 0)
|
|
return 0;
|
|
if (diff < n)
|
|
n = diff;
|
|
error = pcbmap(dep, lbn, &bn, &cn);
|
|
if (error)
|
|
break;
|
|
error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return error;
|
|
}
|
|
n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
|
|
|
|
/*
|
|
* code to convert from dos directory entries to ufs directory entries
|
|
*/
|
|
pushout = 0;
|
|
dentp = (struct direntry *)(bp->b_un.b_addr + on);
|
|
prev = 0;
|
|
crnt = (struct dirent *)dirbuf;
|
|
while ((char *)dentp < bp->b_un.b_addr + on + n) {
|
|
/*printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
|
|
dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);*/
|
|
/*
|
|
* If we have an empty entry or a slot from a deleted
|
|
* file, or a volume label entry just concatenate its
|
|
* space onto the end of the previous entry or,
|
|
* manufacture an empty entry if there is no previous
|
|
* entry.
|
|
*/
|
|
if (dentp->deName[0] == SLOT_EMPTY ||
|
|
dentp->deName[0] == SLOT_DELETED ||
|
|
(dentp->deAttributes & ATTR_VOLUME)) {
|
|
if (prev) {
|
|
prev->d_reclen += sizeof(struct direntry);
|
|
} else {
|
|
prev = crnt;
|
|
prev->d_fileno = 0;
|
|
prev->d_reclen = sizeof(struct direntry);
|
|
prev->d_namlen = 0;
|
|
prev->d_name[0] = 0;
|
|
}
|
|
} else {
|
|
/* this computation of d_fileno must match
|
|
* the computation of va_fileid in pcfs_getattr */
|
|
if (dentp->deAttributes & ATTR_DIRECTORY) {
|
|
/* if this is the root directory */
|
|
if ((fileno = dentp->deStartCluster) == PCFSROOT)
|
|
fileno = 1;
|
|
} else {
|
|
/* if the file's dirent lives in root dir */
|
|
if ((fileno = cn) == PCFSROOT)
|
|
fileno = 1;
|
|
fileno = (fileno << 16) |
|
|
((dentp - (struct direntry *)bp->b_un.b_addr) & 0xffff);
|
|
}
|
|
crnt->d_fileno = fileno;
|
|
crnt->d_reclen = sizeof(struct direntry);
|
|
crnt->d_namlen = dos2unixfn(dentp->deName,
|
|
(u_char *)crnt->d_name);
|
|
/*printf("readdir: file %s, fileno %08x, attr %02x, start %08x\n",
|
|
crnt->d_name, crnt->d_fileno, dentp->deAttributes, dentp->deStartCluster);*/
|
|
prev = crnt;
|
|
}
|
|
crnt = (struct dirent *)((char *)crnt + sizeof(struct direntry));
|
|
pushout = 1;
|
|
|
|
/*
|
|
* If our intermediate buffer is full then copy
|
|
* its contents to user space.
|
|
*/
|
|
if ((u_char *)crnt >= &dirbuf[sizeof dirbuf]) {
|
|
pushout = 0;
|
|
error = uiomove(dirbuf, sizeof(dirbuf), uio);
|
|
if (error)
|
|
break;
|
|
prev = 0;
|
|
crnt = (struct dirent *)dirbuf;
|
|
}
|
|
dentp++;
|
|
}
|
|
if (pushout) {
|
|
pushout = 0;
|
|
error = uiomove(dirbuf, (char *)crnt - (char *)dirbuf,
|
|
uio);
|
|
}
|
|
|
|
/*
|
|
* If we have read everything from this block or
|
|
* have read to end of file then we are done with
|
|
* this block. Mark it to say the buffer can be reused if
|
|
* need be.
|
|
*/
|
|
#if 0
|
|
if (n + on == pmp->pm_bpcluster ||
|
|
(uio->uio_offset-bias) == dep->de_FileSize)
|
|
bp->b_flags |= B_AGE;
|
|
#endif
|
|
brelse(bp);
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
out:;
|
|
uio->uio_resid += lost;
|
|
|
|
/*
|
|
* I don't know why we bother setting this eofflag, getdirentries()
|
|
* in vfs_syscalls.c doesn't bother to look at it when we return.
|
|
* But nfsrv_readdir does.
|
|
*/
|
|
if (dep->de_FileSize - uio->uio_offset - bias <= 0)
|
|
*eofflagp = 1;
|
|
else
|
|
*eofflagp = 0;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* DOS filesystems don't know what symlinks are.
|
|
*/
|
|
int
|
|
pcfs_readlink(vp, uio, cred)
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
int
|
|
pcfs_abortop(ndp)
|
|
struct nameidata *ndp;
|
|
{
|
|
if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF)
|
|
FREE(ndp->ni_pnbuf, M_NAMEI);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pcfs_lock(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
DELOCK(dep);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pcfs_unlock(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
if (!(dep->de_flag & DELOCKED))
|
|
panic("pcfs_unlock: denode not locked");
|
|
DEUNLOCK(dep);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pcfs_islocked(vp)
|
|
struct vnode *vp;
|
|
{
|
|
return VTODE(vp)->de_flag & DELOCKED ? 1 : 0;
|
|
}
|
|
|
|
/*
|
|
* vp - address of vnode file the file
|
|
* bn - which cluster we are interested in mapping to
|
|
* a filesystem block number.
|
|
* vpp - returns the vnode for the block special file
|
|
* holding the filesystem containing the file of interest
|
|
* bnp - address of where to return the filesystem
|
|
* relative block number
|
|
*/
|
|
int
|
|
pcfs_bmap(vp, bn, vpp, bnp)
|
|
struct vnode *vp;
|
|
daddr_t bn;
|
|
struct vnode **vpp;
|
|
daddr_t *bnp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
struct pcfsmount *pmp = dep->de_pmp;
|
|
|
|
if (vpp != NULL)
|
|
*vpp = dep->de_devvp;
|
|
if (bnp == NULL)
|
|
return 0;
|
|
return pcbmap(dep, bn << (pmp->pm_cnshift - pmp->pm_bnshift), bnp, 0);
|
|
}
|
|
|
|
int
|
|
pcfs_strategy(bp)
|
|
struct buf *bp;
|
|
{
|
|
struct denode *dep = VTODE(bp->b_vp);
|
|
struct pcfsmount *pmp = dep->de_pmp;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
|
|
panic("pcfs_strategy: spec");
|
|
/*
|
|
* If we don't already know the filesystem relative
|
|
* block number then get it using pcbmap(). If pcbmap()
|
|
* returns the block number as -1 then we've got a hole
|
|
* in the file. DOS filesystems don't allow files with
|
|
* holes, so we shouldn't ever see this.
|
|
*/
|
|
if (bp->b_blkno == bp->b_lblkno) {
|
|
if (error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0))
|
|
return error;
|
|
if ((long)bp->b_blkno == -1)
|
|
clrbuf(bp);
|
|
}
|
|
if ((long)bp->b_blkno == -1) {
|
|
biodone(bp);
|
|
return 0;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
#endif /* defined(DIAGNOSTIC) */
|
|
/*
|
|
* Read/write the block from/to the disk that contains the desired
|
|
* file block.
|
|
*/
|
|
vp = dep->de_devvp;
|
|
bp->b_dev = vp->v_rdev;
|
|
(*(vp->v_op->vop_strategy))(bp);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
pcfs_print(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
printf("tag VT_PCFS, startcluster %d, dircluster %d, diroffset %d ",
|
|
dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
|
|
printf(" dev %d, %d, %s\n",
|
|
major(dep->de_dev), minor(dep->de_dev),
|
|
dep->de_flag & DELOCKED ? "(LOCKED)" : "");
|
|
if (dep->de_spare0) {
|
|
printf(" owner pid %d", dep->de_spare0);
|
|
if (dep->de_spare1)
|
|
printf(" waiting pid %d", dep->de_spare1);
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
int
|
|
pcfs_advlock(vp, id, op, fl, flags)
|
|
struct vnode *vp;
|
|
caddr_t id;
|
|
int op;
|
|
struct flock *fl;
|
|
int flags;
|
|
{
|
|
return EINVAL; /* we don't do locking yet */
|
|
}
|
|
|
|
struct vnodeops pcfs_vnodeops = {
|
|
pcfs_lookup,
|
|
pcfs_create,
|
|
pcfs_mknod,
|
|
pcfs_open,
|
|
pcfs_close,
|
|
pcfs_access,
|
|
pcfs_getattr,
|
|
pcfs_setattr,
|
|
pcfs_read,
|
|
pcfs_write,
|
|
pcfs_ioctl,
|
|
pcfs_select,
|
|
pcfs_mmap,
|
|
pcfs_fsync,
|
|
pcfs_seek,
|
|
pcfs_remove,
|
|
pcfs_link,
|
|
pcfs_rename,
|
|
pcfs_mkdir,
|
|
pcfs_rmdir,
|
|
pcfs_symlink,
|
|
pcfs_readdir,
|
|
pcfs_readlink,
|
|
pcfs_abortop,
|
|
pcfs_inactive,
|
|
pcfs_reclaim,
|
|
pcfs_lock,
|
|
pcfs_unlock,
|
|
pcfs_bmap,
|
|
pcfs_strategy,
|
|
pcfs_print,
|
|
pcfs_islocked,
|
|
pcfs_advlock,
|
|
};
|