1706 lines
43 KiB
C
1706 lines
43 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, just don't say you wrote
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* it, 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 redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*
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* msdosfs_vnops.c,v 1.1 1993/08/13 11:35:40 cgd Exp
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
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#include <sys/kernel.h>
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#include <sys/file.h> /* define FWRITE ... */
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#include <sys/stat.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
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#include <sys/malloc.h>
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#include <sys/dir.h> /* defines dirent structure */
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#include <msdosfs/bpb.h>
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#include <msdosfs/direntry.h>
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#include <msdosfs/denode.h>
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#include <msdosfs/msdosfsmount.h>
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#include <msdosfs/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 blocks are
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* read/written using the vnode for the filesystem. Blocks that represent
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* the contents of a file are read/written using the vnode for the file
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* (including directories when they are read/written as files). This
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* presents problems for the dos filesystem because data that should be in
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* an inode (if dos had them) resides in the directory itself. Since we
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* must update directory entries without the benefit of having the vnode
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* for the directory we must use the vnode for the filesystem. This means
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* that when a directory is actually read/written (via read, write, or
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* readdir, or seek) we must use the vnode for the filesystem instead of
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* the vnode for the directory as would happen in ufs. This is to insure we
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* retreive the correct block from the buffer cache since the hash value is
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* based upon the vnode address and the desired block number.
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*/
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/*
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* Create a regular file. On entry the directory to contain the file being
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* created is locked. We must release before we return. We must also free
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* the pathname buffer pointed at by ndp->ni_pnbuf, always on error, or
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* only if the SAVESTART bit in ni_nameiop is clear on success.
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*/
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int
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msdosfs_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(MSDOSFSDEBUG)
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printf("msdosfs_create(ndp %08x, vap %08x, p %08x\n", ndp, vap, p);
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#endif /* defined(MSDOSFSDEBUG) */
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/*
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* Create a directory entry for the file, then call createde() to
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* have it installed. NOTE: DOS files are always executable. We
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* use the absence of the owner write bit to make the file
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* 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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}
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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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msdosfs_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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struct denode *pdep = VTODE(ndp->ni_dvp);
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switch (vap->va_type) {
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case VDIR:
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error = msdosfs_mkdir(ndp, vap, p);
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break;
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/*
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* msdosfs_create() sets ndp->ni_vp.
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*/
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case VREG:
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error = msdosfs_create(ndp, vap, p);
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break;
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default:
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error = EINVAL;
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free(ndp->ni_pnbuf, M_NAMEI);
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deput(pdep);
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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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msdosfs_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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msdosfs_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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msdosfs_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 without the x-bit
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* on? But, for dos filesystems every file is executable. I may
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* 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, and/or VEXEC
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* bits turned on. In an octal number these are the Y in 0Y00.
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*
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* Since the dos filesystem doesn't have the concept of file ownership
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* we just give everybody read and execute access and write access
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* 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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msdosfs_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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/*
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* The following computation of the fileid must be the same as that
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* used in msdosfs_readdir() to compute d_fileno. If not, pwd
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* doesn't work.
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*/
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if (dep->de_Attributes & ATTR_DIRECTORY) {
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if ((cn = dep->de_StartCluster) == MSDOSFSROOT)
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cn = 1;
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}
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else {
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if ((cn = dep->de_dirclust) == MSDOSFSROOT)
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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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#ifndef MSDOSFS_NODIRMOD
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if (vap->va_mode & S_IFDIR) {
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vap->va_mtime.tv_sec = time.tv_sec;
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vap->va_mtime.tv_usec = time.tv_usec;
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}
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#endif
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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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msdosfs_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(MSDOSFSDEBUG)
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printf("msdosfs_setattr(): vp %08x, vap %08x, cred %08x, p %08x\n",
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vp, vap, cred, p);
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#endif /* defined(MSDOSFSDEBUG) */
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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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(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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#if defined(MSDOSFSDEBUG)
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printf("msdosfs_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(MSDOSFSDEBUG) */
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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 writability
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* attribute set, so we use the owner write bit to set the readonly
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* 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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msdosfs_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 msdosfsmount *pmp = dep->de_pmp;
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/*
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* If they didn't ask for any data, then we 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 sure to
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* do i/o with the vnode for the filesystem instead of the
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* 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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}
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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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}
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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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n = MIN(n, pmp->pm_bpcluster - 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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/*
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* If we have read everything from this block or have read
|
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* to end of file then we are done with this block. Mark
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* it to say the buffer can be reused if 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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/*
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* Write data to a file or directory.
|
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*/
|
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int
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msdosfs_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;
|
|
int isadir;
|
|
int croffset;
|
|
int resid;
|
|
int osize;
|
|
int error;
|
|
u_long cluster;
|
|
u_long nextcluster;
|
|
u_long lastcluster;
|
|
daddr_t bn;
|
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struct buf *bp;
|
|
struct proc *p = uio->uio_procp;
|
|
struct vnode *thisvp;
|
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struct denode *dep = VTODE(vp);
|
|
struct msdosfsmount *pmp = dep->de_pmp;
|
|
|
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#if defined(MSDOSFSDEBUG)
|
|
printf("msdosfs_write(vp %08x, uio %08x, ioflag %08x, cred %08x\n",
|
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vp, uio, ioflag, cred);
|
|
printf("msdosfs_write(): diroff %d, dirclust %d, startcluster %d\n",
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dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
|
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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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isadir = 0;
|
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thisvp = vp;
|
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break;
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|
|
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case VDIR:
|
|
if ((ioflag & IO_SYNC) == 0)
|
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panic("msdosfs_write(): non-sync directory update");
|
|
isadir = 1;
|
|
thisvp = pmp->pm_devvp;
|
|
break;
|
|
|
|
default:
|
|
panic("msdosfs_write(): bad file type");
|
|
break;
|
|
}
|
|
|
|
if (uio->uio_offset < 0) {
|
|
return EINVAL;
|
|
}
|
|
if (uio->uio_resid == 0)
|
|
return 0;
|
|
|
|
/*
|
|
* If they've exceeded their filesize limit, tell them about it.
|
|
*/
|
|
if (vp->v_type == VREG && p &&
|
|
((uio->uio_offset + uio->uio_resid) >
|
|
p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
|
|
psignal(p, SIGXFSZ);
|
|
return EFBIG;
|
|
}
|
|
|
|
/*
|
|
* If attempting to write beyond the end of the root directory we
|
|
* stop that here because the root directory can not grow.
|
|
*/
|
|
if ((dep->de_Attributes & ATTR_DIRECTORY) &&
|
|
dep->de_StartCluster == MSDOSFSROOT &&
|
|
(uio->uio_offset + uio->uio_resid) > dep->de_FileSize)
|
|
return ENOSPC;
|
|
|
|
/*
|
|
* 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. We do this by calling our seek function.
|
|
* This could probably be cleaned up someday.
|
|
*/
|
|
if (uio->uio_offset > dep->de_FileSize) {
|
|
error = msdosfs_seek(vp, (off_t) 0, uio->uio_offset, cred);
|
|
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;
|
|
/*
|
|
* 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 (isadir) {
|
|
error = pcbmap(dep, bn, &bn, 0);
|
|
if (error)
|
|
return error;
|
|
}
|
|
error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
croffset = uio->uio_offset & pmp->pm_crbomask;
|
|
n = MIN(uio->uio_resid, pmp->pm_bpcluster - croffset);
|
|
if (uio->uio_offset + n > dep->de_FileSize) {
|
|
dep->de_FileSize = uio->uio_offset + n;
|
|
vnode_pager_setsize(vp, dep->de_FileSize); /* why? */
|
|
}
|
|
(void) vnode_pager_uncache(vp); /* why not? */
|
|
/*
|
|
* Should these vnode_pager_* functions be done on dir
|
|
* files?
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
msdosfs_ioctl(vp, com, data, fflag, cred, p)
|
|
struct vnode *vp;
|
|
int com;
|
|
caddr_t data;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
return ENOTTY;
|
|
}
|
|
|
|
int
|
|
msdosfs_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
|
|
msdosfs_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
|
|
msdosfs_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;
|
|
/*
|
|
* Does this call to vflushbuf() do anything? I can find no code
|
|
* anywhere that sets v_dirtyblkhd in the vnode, which vflushbuf()
|
|
* seems to depend upon.
|
|
*/
|
|
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 seek past the end of file
|
|
* happens.
|
|
*
|
|
* It seems that nothing in the kernel calls the filesystem specific file seek
|
|
* functions. And, someone on the net told me that NFS never sends
|
|
* announcements of seeks to the server. So, if msdosfs ever becomes NFS
|
|
* mountable it will have to use other means to fill in holes in what would
|
|
* be a sparse file. (This appears fixed since msdosfs_write() calls seek
|
|
* before writing if the offset is past EOF)
|
|
*/
|
|
int
|
|
msdosfs_seek(vp, oldoff, newoff, cred)
|
|
struct vnode *vp;
|
|
off_t oldoff;
|
|
off_t newoff;
|
|
struct ucred *cred;
|
|
{
|
|
int error = 0;
|
|
off_t foff;
|
|
daddr_t bn;
|
|
u_long cluster;
|
|
u_long lastcluster;
|
|
struct buf *bp;
|
|
struct denode *dep = VTODE(vp);
|
|
struct msdosfsmount *pmp = dep->de_pmp;
|
|
|
|
#if defined(MSDOSFSDEBUG)
|
|
printf("msdosfs_seek(vp %08x, oldoff %d, newoff %d, cred %08x)\n",
|
|
vp, oldoff, newoff, cred);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
|
|
/*
|
|
* Compute the offset of the first byte after the last block in the
|
|
* file. If seeking 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 defined(MSDOSFSDEBUG)
|
|
printf("seek: newoff %d > foff %d\n", newoff, foff);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
if (newoff > foff) {
|
|
/*
|
|
* If this is the root directory and we are attempting to
|
|
* seek beyond the end disallow it. DOS filesystem root
|
|
* directories can not grow.
|
|
*/
|
|
if (vp->v_flag & VROOT)
|
|
return EINVAL;
|
|
/*
|
|
* If this is a directory and the caller is not root, then
|
|
* do not let them seek beyond the end of file. If we
|
|
* allowed this then users could cause directories to grow.
|
|
* Is this really that important?
|
|
*/
|
|
if (dep->de_Attributes & ATTR_DIRECTORY) {
|
|
if (error = suser(cred, NULL)) {
|
|
return error;
|
|
}
|
|
}
|
|
/*
|
|
* 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;
|
|
dep->de_flag |= DEUPD;
|
|
bdwrite(bp);
|
|
foff += pmp->pm_bpcluster;
|
|
dep->de_FileSize += pmp->pm_bpcluster;
|
|
} /* end while() */
|
|
dep->de_FileSize = newoff;
|
|
return deupdat(dep, &time);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
msdosfs_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(MSDOSFSDEBUG)
|
|
printf("msdosfs_remove(), dep %08x, v_usecount %d\n", dep, ndp->ni_vp->v_usecount);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
if (ddep == dep)
|
|
vrele(DETOV(dep));
|
|
else
|
|
deput(dep); /* causes msdosfs_inactive() to be called
|
|
* via vrele() */
|
|
deput(ddep);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* DOS filesystems don't know what links are. But since we already called
|
|
* msdosfs_lookup() with create and lockparent, the parent is locked so we
|
|
* have to free it before we return the error.
|
|
*/
|
|
int
|
|
msdosfs_link(vp, ndp, p)
|
|
struct vnode *vp;
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
struct denode *pdep = VTODE(ndp->ni_dvp);
|
|
|
|
free(ndp->ni_pnbuf, M_NAMEI);
|
|
deput(pdep);
|
|
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
|
|
msdosfs_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 msdosfsmount *pmp;
|
|
struct direntry *dotdotp;
|
|
struct direntry *ep;
|
|
struct buf *bp;
|
|
|
|
#if defined(MSDOSFSDEBUG)
|
|
printf("msdosfs_rename(fndp %08x, tndp %08x, p %08x\n", fndp, tndp, p);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
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;
|
|
|
|
#ifdef __NetBSD__
|
|
/* Check for cross-device rename */
|
|
if ((fndp->ni_vp->v_mount != tndp->ni_dvp->v_mount) ||
|
|
(tndp->ni_vp && (fndp->ni_vp->v_mount != tndp->ni_vp->v_mount))) {
|
|
error = EXDEV;
|
|
goto bad;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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("msdosfs_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_msdosfs.msdosfs_count = 1;
|
|
tndp->ni_msdosfs.msdosfs_cluster = to_dirclust;
|
|
tndp->ni_msdosfs.msdosfs_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 = readep(fdep->de_pmp,
|
|
fndp->ni_msdosfs.msdosfs_cluster,
|
|
fndp->ni_msdosfs.msdosfs_offset,
|
|
&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);
|
|
if (error = readep(fdep->de_pmp,
|
|
fndp->ni_msdosfs.msdosfs_cluster,
|
|
fndp->ni_msdosfs.msdosfs_offset,
|
|
&bp, &ep)) {
|
|
DEUNLOCK(fdep);
|
|
DEUNLOCK(fddep);
|
|
goto bad;
|
|
}
|
|
ep->deName[0] = SLOT_DELETED;
|
|
if (error = bwrite(bp)) {
|
|
DEUNLOCK(fdep);
|
|
DEUNLOCK(fddep);
|
|
goto bad;
|
|
}
|
|
fdep->de_dirclust = tndp->ni_msdosfs.msdosfs_cluster;
|
|
fdep->de_diroffset = tndp->ni_msdosfs.msdosfs_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 == MSDOSFSROOT) {
|
|
/* this should never happen */
|
|
panic("msdosfs_rename(): updating .. in root directory?\n");
|
|
}
|
|
else {
|
|
bn = cntobn(pmp, cn);
|
|
}
|
|
error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
|
|
NOCRED, &bp);
|
|
if (error) {
|
|
/* should really panic here, fs is corrupt */
|
|
DEUNLOCK(fdep);
|
|
goto bad;
|
|
}
|
|
dotdotp = (struct direntry *) bp->b_un.b_addr + 1;
|
|
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
|
|
msdosfs_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 msdosfsmount *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 == MSDOSFSROOT && ndp->ni_msdosfs.msdosfs_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 */
|
|
bzero(bp->b_un.b_addr, pmp->pm_bpcluster);
|
|
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(MSDOSFSDEBUG)
|
|
printf("msdosfs_mkdir(): deput(%08x), vnode %08x\n", pdep, DETOV(pdep));
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
deput(pdep);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
msdosfs_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 msdosfs_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
|
|
msdosfs_symlink(ndp, vap, target, p)
|
|
struct nameidata *ndp;
|
|
struct vattr *vap;
|
|
char *target;
|
|
struct proc *p;
|
|
{
|
|
struct denode *pdep = VTODE(ndp->ni_dvp);
|
|
|
|
free(ndp->ni_pnbuf, M_NAMEI);
|
|
deput(pdep);
|
|
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
|
|
msdosfs_readdir(vp, uio, cred, eofflagp, cookies, ncookies)
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
int *eofflagp;
|
|
u_int *cookies;
|
|
int ncookies;
|
|
{
|
|
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 msdosfsmount *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(MSDOSFSDEBUG)
|
|
printf("msdosfs_readdir(): vp %08x, uio %08x, cred %08x, eofflagp %08x\n",
|
|
vp, uio, cred, eofflagp);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
|
|
if (!cookies)
|
|
ncookies = 1;
|
|
|
|
/*
|
|
* msdosfs_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 == MSDOSFSROOT) {
|
|
/*
|
|
* printf("msdosfs_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)) {
|
|
if (uio->uio_offset
|
|
&& uio->uio_offset != sizeof(struct direntry)) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
n = 1;
|
|
if (!uio->uio_offset) {
|
|
n = 2;
|
|
if (cookies) {
|
|
*cookies++ = sizeof(struct direntry);
|
|
ncookies--;
|
|
}
|
|
}
|
|
if (cookies) {
|
|
if (ncookies-- <= 0)
|
|
n--;
|
|
else
|
|
*cookies++ = 2 * sizeof(struct direntry);
|
|
}
|
|
|
|
error = uiomove((char *) rootdots + uio->uio_offset,
|
|
n * sizeof(struct direntry), uio);
|
|
}
|
|
}
|
|
while (!error && uio->uio_resid > 0 && ncookies > 0) {
|
|
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);
|
|
n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
|
|
if (error) {
|
|
brelse(bp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
if (cookies) {
|
|
ncookies++;
|
|
cookies--;
|
|
}
|
|
}
|
|
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
|
|
* msdosfs_getattr
|
|
*/
|
|
if (dentp->deAttributes & ATTR_DIRECTORY) {
|
|
/* if this is the root directory */
|
|
if ((fileno = dentp->deStartCluster) == MSDOSFSROOT)
|
|
fileno = 1;
|
|
}
|
|
else {
|
|
/*
|
|
* if the file's dirent lives in
|
|
* root dir
|
|
*/
|
|
if ((fileno = cn) == MSDOSFSROOT)
|
|
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;
|
|
}
|
|
dentp++;
|
|
if (cookies) {
|
|
*cookies++ = (u_int)((char *)dentp - bp->b_un.b_addr - on)
|
|
+ uio->uio_offset;
|
|
ncookies--;
|
|
}
|
|
|
|
crnt = (struct dirent *) ((char *) crnt + sizeof(struct direntry));
|
|
pushout = 1;
|
|
|
|
/*
|
|
* If our intermediate buffer is full then copy its
|
|
* contents to user space. I would just use the
|
|
* buffer the buf header points to but, I'm afraid
|
|
* that when we brelse() it someone else might find
|
|
* it in the cache and think its contents are
|
|
* valid. Maybe there is a way to invalidate the
|
|
* buffer before brelse()'ing it.
|
|
*/
|
|
if ((u_char *) crnt >= &dirbuf[sizeof dirbuf]) {
|
|
pushout = 0;
|
|
error = uiomove(dirbuf, sizeof(dirbuf), uio);
|
|
if (error)
|
|
break;
|
|
prev = 0;
|
|
crnt = (struct dirent *) dirbuf;
|
|
}
|
|
if (ncookies <= 0)
|
|
break;
|
|
}
|
|
if (pushout) {
|
|
pushout = 0;
|
|
error = uiomove(dirbuf, (char *) crnt - (char *) dirbuf,
|
|
uio);
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* 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 (n + on == pmp->pm_bpcluster ||
|
|
(uio->uio_offset - bias) == dep->de_FileSize)
|
|
bp->b_flags |= B_AGE;
|
|
#endif /* if 0 */
|
|
brelse(bp);
|
|
if (n == 0)
|
|
break;
|
|
}
|
|
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.
|
|
* (because NFS uses it in nfs_serv.c -- JMP)
|
|
*/
|
|
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
|
|
msdosfs_readlink(vp, uio, cred)
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
int
|
|
msdosfs_abortop(ndp)
|
|
struct nameidata *ndp;
|
|
{
|
|
if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF)
|
|
FREE(ndp->ni_pnbuf, M_NAMEI);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
msdosfs_lock(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
DELOCK(dep);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
msdosfs_unlock(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
if (!(dep->de_flag & DELOCKED))
|
|
panic("msdosfs_unlock: denode not locked");
|
|
DEUNLOCK(dep);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
msdosfs_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
|
|
msdosfs_bmap(vp, bn, vpp, bnp)
|
|
struct vnode *vp;
|
|
daddr_t bn;
|
|
struct vnode **vpp;
|
|
daddr_t *bnp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
struct msdosfsmount *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
|
|
msdosfs_strategy(bp)
|
|
struct buf *bp;
|
|
{
|
|
struct denode *dep = VTODE(bp->b_vp);
|
|
struct msdosfsmount *pmp = dep->de_pmp;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
|
|
panic("msdosfs_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
|
|
msdosfs_print(vp)
|
|
struct vnode *vp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
|
|
printf("tag VT_MSDOSFS, 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
|
|
msdosfs_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 msdosfs_vnodeops = {
|
|
msdosfs_lookup,
|
|
msdosfs_create,
|
|
msdosfs_mknod,
|
|
msdosfs_open,
|
|
msdosfs_close,
|
|
msdosfs_access,
|
|
msdosfs_getattr,
|
|
msdosfs_setattr,
|
|
msdosfs_read,
|
|
msdosfs_write,
|
|
msdosfs_ioctl,
|
|
msdosfs_select,
|
|
msdosfs_mmap,
|
|
msdosfs_fsync,
|
|
msdosfs_seek,
|
|
msdosfs_remove,
|
|
msdosfs_link,
|
|
msdosfs_rename,
|
|
msdosfs_mkdir,
|
|
msdosfs_rmdir,
|
|
msdosfs_symlink,
|
|
msdosfs_readdir,
|
|
msdosfs_readlink,
|
|
msdosfs_abortop,
|
|
msdosfs_inactive,
|
|
msdosfs_reclaim,
|
|
msdosfs_lock,
|
|
msdosfs_unlock,
|
|
msdosfs_bmap,
|
|
msdosfs_strategy,
|
|
msdosfs_print,
|
|
msdosfs_islocked,
|
|
msdosfs_advlock,
|
|
};
|