int
msdosfs_inactive(void *v)
{
	struct vop_inactive_args *ap = v;
	struct vnode *vp = ap->a_vp;
	struct denode *dep = VTODE(vp);
	struct proc *p = ap->a_p;
	int error;
#ifdef DIAGNOSTIC
	extern int prtactive;

	if (prtactive && vp->v_usecount != 0)
		vprint("msdosfs_inactive(): pushing active", vp);
#endif
	
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_inactive(): dep %08x, de_Name[0] %x\n", dep,
	    dep->de_Name[0]);
#endif

	error = 0;

	/*
	 * Get rid of denodes related to stale file handles.
	 */
	if (dep->de_Name[0] == SLOT_DELETED) 
		goto out;

	/*
	 * If the file has been deleted and it is on a read/write
	 * filesystem, then truncate the file, and mark the directory slot
	 * as empty.  (This may not be necessary for the dos filesystem.)
	 */
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_inactive(): dep %08x, refcnt %d, mntflag %x, MNT_RDONLY %x\n",
	       dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
#endif
	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
		error = detrunc(dep, (uint32_t)0, 0, NOCRED, NULL);
		dep->de_Name[0] = SLOT_DELETED;
	}
	deupdat(dep, 0);

out:
	VOP_UNLOCK(vp, 0, p);
	/*
	 * If we are done with the denode, reclaim it
	 * so that it can be reused immediately.
	 */
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
	    vp->v_usecount, dep->de_Name[0]);
#endif
	if (dep->de_Name[0] == SLOT_DELETED)
		vrecycle(vp, p);
	return (error);
}
Beispiel #2
0
/*
 * 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(void *v)
{
	struct vop_fsync_args *ap = v;
	struct vnode *vp = ap->a_vp;

	vflushbuf(vp, ap->a_waitfor == MNT_WAIT);
	return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT));
}
int
msdosfs_inactive(struct vop_inactive_args *ap)
{
	struct vnode *vp = ap->a_vp;
	struct denode *dep = VTODE(vp);
	int error = 0;

#ifdef MSDOSFS_DEBUG
	printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
#endif

	/*
	 * Ignore denodes related to stale file handles.
	 */
	if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
		goto out;

	/*
	 * If the file has been deleted and it is on a read/write
	 * filesystem, then truncate the file, and mark the directory slot
	 * as empty.  (This may not be necessary for the dos filesystem.)
	 */
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %llx, MNT_RDONLY %llx\n",
	    dep, dep->de_refcnt, (unsigned long long)vp->v_mount->mnt_flag,
	    (unsigned long long)MNT_RDONLY);
#endif
	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
		error = detrunc(dep, (u_long) 0, 0, NOCRED);
		dep->de_flag |= DE_UPDATE;
		dep->de_Name[0] = SLOT_DELETED;
	}
	deupdat(dep, 0);

out:
	/*
	 * If we are done with the denode, reclaim it
	 * so that it can be reused immediately.
	 */
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
	       vrefcnt(vp), dep->de_Name[0]);
#endif
	if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
		vrecycle(vp);
	return (error);
}
/*
 * Extend the file described by dep to length specified by length.
 */
int
deextend(struct denode *dep, uint32_t length, struct ucred *cred)
{
	struct msdosfsmount *pmp = dep->de_pmp;
	uint32_t count;
	int error;
	
	/*
	 * The root of a DOS filesystem cannot be extended.
	 */
	if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
		return (EINVAL);

	/*
	 * Directories cannot be extended.
	 */
	if (dep->de_Attributes & ATTR_DIRECTORY)
		return (EISDIR);

	if (length <= dep->de_FileSize)
		panic("deextend: file too large");
	
	/*
	 * Compute the number of clusters to allocate.
	 */
	count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
	if (count > 0) {
		if (count > pmp->pm_freeclustercount)
			return (ENOSPC);
		error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
		if (error) {
			/* truncate the added clusters away again */
			(void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
			return (error);
		}
	}
		
	dep->de_FileSize = length;
	dep->de_flag |= DE_UPDATE|DE_MODIFIED;
	return (deupdat(dep, 1));
}
Beispiel #5
0
/*
 * Truncate the file described by dep to the length specified by length.
 */
int
detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred)
{
	int error;
	int allerror;
	u_long eofentry;
	u_long chaintofree;
	daddr_t bn;
	int boff;
	int isadir = dep->de_Attributes & ATTR_DIRECTORY;
	struct buf *bp;
	struct msdosfsmount *pmp = dep->de_pmp;

#ifdef MSDOSFS_DEBUG
	printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
#endif

	/*
	 * Disallow attempts to truncate the root directory since it is of
	 * fixed size.  That's just the way dos filesystems are.  We use
	 * the VROOT bit in the vnode because checking for the directory
	 * bit and a startcluster of 0 in the denode is not adequate to
	 * recognize the root directory at this point in a file or
	 * directory's life.
	 */
	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
#ifdef MSDOSFS_DEBUG
		printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
		    dep->de_dirclust, dep->de_diroffset);
#endif
		return (EINVAL);
	}

	if (dep->de_FileSize < length) {
		vnode_pager_setsize(DETOV(dep), length);
		return deextend(dep, length, cred);
	}

	/*
	 * If the desired length is 0 then remember the starting cluster of
	 * the file and set the StartCluster field in the directory entry
	 * to 0.  If the desired length is not zero, then get the number of
	 * the last cluster in the shortened file.  Then get the number of
	 * the first cluster in the part of the file that is to be freed.
	 * Then set the next cluster pointer in the last cluster of the
	 * file to CLUST_EOFE.
	 */
	if (length == 0) {
		chaintofree = dep->de_StartCluster;
		dep->de_StartCluster = 0;
		eofentry = ~0;
	} else {
		error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 
			       &eofentry, 0);
		if (error) {
#ifdef MSDOSFS_DEBUG
			printf("detrunc(): pcbmap fails %d\n", error);
#endif
			return (error);
		}
	}

	fc_purge(dep, de_clcount(pmp, length));

	/*
	 * If the new length is not a multiple of the cluster size then we
	 * must zero the tail end of the new last cluster in case it
	 * becomes part of the file again because of a seek.
	 */
	if ((boff = length & pmp->pm_crbomask) != 0) {
		if (isadir) {
			bn = cntobn(pmp, eofentry);
			error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
			    NOCRED, &bp);
			if (error) {
				brelse(bp);
#ifdef MSDOSFS_DEBUG
				printf("detrunc(): bread fails %d\n", error);
#endif
				return (error);
			}
			bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
			if (flags & IO_SYNC)
				bwrite(bp);
			else
				bdwrite(bp);
		}
	}

	/*
	 * Write out the updated directory entry.  Even if the update fails
	 * we free the trailing clusters.
	 */
	dep->de_FileSize = length;
	if (!isadir)
		dep->de_flag |= DE_UPDATE | DE_MODIFIED;
	allerror = vtruncbuf(DETOV(dep), cred, length, pmp->pm_bpcluster);
#ifdef MSDOSFS_DEBUG
	if (allerror)
		printf("detrunc(): vtruncbuf error %d\n", allerror);
#endif
	error = deupdat(dep, !DOINGASYNC((DETOV(dep))));
	if (error != 0 && allerror == 0)
		allerror = error;
#ifdef MSDOSFS_DEBUG
	printf("detrunc(): allerror %d, eofentry %lu\n",
	       allerror, eofentry);
#endif

	/*
	 * If we need to break the cluster chain for the file then do it
	 * now.
	 */
	if (eofentry != ~0) {
		error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
				 &chaintofree, CLUST_EOFE);
		if (error) {
#ifdef MSDOSFS_DEBUG
			printf("detrunc(): fatentry errors %d\n", error);
#endif
			return (error);
		}
		fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
			    eofentry);
	}

	/*
	 * Now free the clusters removed from the file because of the
	 * truncation.
	 */
	if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
		freeclusterchain(pmp, chaintofree);

	return (allerror);
}
Beispiel #6
0
/*
 * Write data to a file or directory.
 */
int
msdosfs_write(void *v)
{
	struct vop_write_args *ap = v;
	int n;
	int croffset;
	int resid;
	uint32_t osize;
	int error = 0;
	uint32_t count, lastcn;
	daddr64_t bn;
	struct buf *bp;
	int ioflag = ap->a_ioflag;
	struct uio *uio = ap->a_uio;
	struct proc *p = uio->uio_procp;
	struct vnode *vp = ap->a_vp;
	struct vnode *thisvp;
	struct denode *dep = VTODE(vp);
	struct msdosfsmount *pmp = dep->de_pmp;
	struct ucred *cred = ap->a_cred;

#ifdef MSDOSFS_DEBUG
	printf("msdosfs_write(vp %08x, uio %08x, ioflag %08x, cred %08x\n",
	    vp, uio, ioflag, cred);
	printf("msdosfs_write(): diroff %d, dirclust %d, startcluster %d\n",
	    dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
#endif

	switch (vp->v_type) {
	case VREG:
		if (ioflag & IO_APPEND)
			uio->uio_offset = dep->de_FileSize;
		thisvp = vp;
		break;
	case VDIR:
		return EISDIR;
	default:
		panic("msdosfs_write(): bad file type");
	}

	if (uio->uio_offset < 0)
		return (EINVAL);

	if (uio->uio_resid == 0)
		return (0);

	/* Don't bother to try to write files larger than the f/s limit */
	if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX)
		return (EFBIG);

	/*
	 * If they've exceeded their filesize limit, tell them about it.
	 */
	if (p &&
	    ((uio->uio_offset + uio->uio_resid) >
	    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) {
		if ((error = deextend(dep, uio->uio_offset, cred)) != 0)
			return (error);
	}

	/*
	 * Remember some values in case the write fails.
	 */
	resid = uio->uio_resid;
	osize = dep->de_FileSize;

	/*
	 * If we write beyond the end of the file, extend it to its ultimate
	 * size ahead of the time to hopefully get a contiguous area.
	 */
	if (uio->uio_offset + resid > osize) {
		count = de_clcount(pmp, uio->uio_offset + resid) -
			de_clcount(pmp, osize);
		if ((error = extendfile(dep, count, NULL, NULL, 0)) &&
		    (error != ENOSPC || (ioflag & IO_UNIT)))
			goto errexit;
		lastcn = dep->de_fc[FC_LASTFC].fc_frcn;
	} else
		lastcn = de_clcount(pmp, osize) - 1;

	do {
		if (de_cluster(pmp, uio->uio_offset) > lastcn) {
			error = ENOSPC;
			break;
		}

		bn = de_blk(pmp, uio->uio_offset);
		if ((uio->uio_offset & pmp->pm_crbomask) == 0
		    && (de_blk(pmp, uio->uio_offset + uio->uio_resid) > de_blk(pmp, uio->uio_offset)
			|| uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) {
			/*
			 * If either the whole cluster gets written,
			 * or we write the cluster from its start beyond EOF,
			 * then no need to read data from disk.
			 */
			bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0);
			clrbuf(bp);
			/*
			 * Do the bmap now, since pcbmap needs buffers
			 * for the fat table. (see msdosfs_strategy)
			 */
			if (bp->b_blkno == bp->b_lblkno) {
				error = pcbmap(dep,
					       de_bn2cn(pmp, bp->b_lblkno),
					       &bp->b_blkno, 0, 0);
				if (error)
					bp->b_blkno = -1;
			}
			if (bp->b_blkno == -1) {
				brelse(bp);
				if (!error)
					error = EIO;		/* XXX */
				break;
			}
		} else {
			/*
			 * The block we need to write into exists, so read it in.
			 */
			error = bread(thisvp, bn, pmp->pm_bpcluster,
				      NOCRED, &bp);
			if (error) {
				brelse(bp);
				break;
			}
		}

		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;
			uvm_vnp_setsize(vp, dep->de_FileSize);
		}
		uvm_vnp_uncache(vp);
		/*
		 * Should these vnode_pager_* functions be done on dir
		 * files?
		 */

		/*
		 * Copy the data from user space into the buf header.
		 */
		error = uiomove(bp->b_data + 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)
			bawrite(bp);
		else
			bdwrite(bp);
		dep->de_flag |= DE_UPDATE;
	} 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.
	 */
errexit:
	if (error) {
		if (ioflag & IO_UNIT) {
			detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
			uio->uio_offset -= resid - uio->uio_resid;
			uio->uio_resid = resid;
		} else {
			detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
			if (uio->uio_resid != resid)
				error = 0;
		}
	} else if (ioflag & IO_SYNC)
		error = deupdat(dep, 1);
	return (error);
}
Beispiel #7
0
int
msdosfs_setattr(void *v)
{
	struct vop_setattr_args *ap = v;
	int error = 0;
	struct denode *dep = VTODE(ap->a_vp);
	struct vattr *vap = ap->a_vap;
	struct ucred *cred = ap->a_cred;

#ifdef MSDOSFS_DEBUG
	printf("msdosfs_setattr(): vp %08x, vap %08x, cred %08x, p %08x\n",
	    ap->a_vp, vap, cred, ap->a_p);
#endif
	if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
	    (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
	    (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
	    (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) ||
	    (vap->va_uid != VNOVAL) || (vap->va_gid != VNOVAL)) {
#ifdef MSDOSFS_DEBUG
		printf("msdosfs_setattr(): returning EINVAL\n");
		printf("    va_type %d, va_nlink %x, va_fsid %x, va_fileid %x\n",
		    vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
		printf("    va_blocksize %x, va_rdev %x, va_bytes %x, va_gen %x\n",
		    vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
		printf("    va_uid %x, va_gid %x\n",
		    vap->va_uid, vap->va_gid);
#endif
		return (EINVAL);
	}
	/*
	 * Directories must not ever get their attributes modified
	 */
	if (ap->a_vp->v_type == VDIR)
		return (0);

	if (vap->va_size != VNOVAL) {
		error = detrunc(dep, (uint32_t)vap->va_size, 0, cred, ap->a_p);
		if (error)
			return (error);
	}
	if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
		if (cred->cr_uid != dep->de_pmp->pm_uid &&
		    (error = suser_ucred(cred)) &&
		    ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
		    (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p))))
			return (error);
		if (!(dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95)
		    && vap->va_atime.tv_sec != VNOVAL)
			unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL);
		if (vap->va_mtime.tv_sec != VNOVAL)
			unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL);
		dep->de_Attributes |= ATTR_ARCHIVE;
		dep->de_flag |= DE_MODIFIED;
	}
	/*
	 * DOS files only have the ability to have their writability
	 * attribute set, so we use the owner write bit to set the readonly
	 * attribute.
	 */
	if (vap->va_mode != (mode_t)VNOVAL) {
		if (cred->cr_uid != dep->de_pmp->pm_uid &&
		    (error = suser_ucred(cred)))
			return (error);
		/* We ignore the read and execute bits. */
		if (vap->va_mode & VWRITE)
			dep->de_Attributes &= ~ATTR_READONLY;
		else
			dep->de_Attributes |= ATTR_READONLY;
		dep->de_flag |= DE_MODIFIED;
	}
	/*
	 * Allow the `archived' bit to be toggled.
	 */
	if (vap->va_flags != VNOVAL) {
		if (cred->cr_uid != dep->de_pmp->pm_uid &&
		    (error = suser_ucred(cred)))
			return (error);
		if (vap->va_flags & SF_ARCHIVED)
			dep->de_Attributes &= ~ATTR_ARCHIVE;
		else
			dep->de_Attributes |= ATTR_ARCHIVE;
		dep->de_flag |= DE_MODIFIED;
	}
	return (deupdat(dep, 1));
}