680 lines
18 KiB
C
680 lines
18 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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* $Id: msdosfs_vfsops.c,v 1.9 1994/04/07 07:30:23 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/proc.h>
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#include <sys/kernel.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/mount.h>
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#include <sys/buf.h>
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#include <sys/file.h>
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#include <sys/malloc.h>
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#include <msdosfs/bpb.h>
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#include <msdosfs/bootsect.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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int msdosfsdoforce = 0; /* 1 = force unmount */
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/*
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* mp - path - addr in user space of mount point (ie /usr or whatever)
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* data - addr in user space of mount params including the name of the block
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* special file to treat as a filesystem.
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*/
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int
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msdosfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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struct vnode *devvp; /* vnode for blk device to mount */
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struct msdosfs_args args; /* will hold data from mount request */
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struct msdosfsmount *pmp; /* msdosfs specific mount control block */
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struct ucred *cred, *scred;
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struct vattr va;
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int error;
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u_int size;
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/*
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* Copy in the args for the mount request.
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*/
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if (error = copyin(data, (caddr_t) & args, sizeof(struct msdosfs_args)))
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return error;
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#ifndef __NetBSD__
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/*
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* Check to see if they want it to be an exportable filesystem via
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* nfs. And, if they do, should it be read only, and what uid is
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* root to be mapped to.
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*
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* This is done in a completely different (and fs-indepdent) way
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* in NetBSD.
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*/
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if ((args.exflags & MNT_EXPORTED) || (mp->mnt_flag & MNT_EXPORTED)) {
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if (args.exflags & MNT_EXPORTED)
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mp->mnt_flag |= MNT_EXPORTED;
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else
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mp->mnt_flag &= ~MNT_EXPORTED;
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if (args.exflags & MNT_EXRDONLY)
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mp->mnt_flag |= MNT_EXRDONLY;
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else
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mp->mnt_flag &= ~MNT_EXRDONLY;
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mp->mnt_exroot = args.exroot;
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}
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#endif /* __NetBSD__ */
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/*
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* If they just want to update then be sure we can do what is
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* asked. Can't change a filesystem from read/write to read only.
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* Why? And if they've supplied a new device file name then we
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* continue, otherwise return.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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pmp = (struct msdosfsmount *) mp->mnt_data;
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if (pmp->pm_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
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pmp->pm_ronly = 0;
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if (args.fspec == 0)
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return 0;
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}
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/*
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* check to see that the user in owns the target directory.
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* Note the very XXX trick to make sure we're checking as the
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* real user -- were mount() executable by anyone, this wouldn't
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* be a problem.
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*
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* XXX there should be one consistent error out.
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*/
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cred = crdup(p->p_ucred); /* XXX */
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cred->cr_uid = p->p_cred->p_ruid; /* XXX */
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error = VOP_GETATTR(mp->mnt_vnodecovered, &va, cred, p);
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if (error) {
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crfree(cred); /* XXX */
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return (error);
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}
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if ((va.va_uid != cred->cr_uid) &&
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(cred->cr_uid != 0)) {
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error = EACCES;
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crfree(cred); /* XXX */
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return (error);
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}
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/* a user mounted it; we'll verify permissions when unmounting */
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mp->mnt_flag |= MNT_USER;
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/*
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* Now, lookup the name of the block device this mount or name
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* update request is to apply to.
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*/
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ndp->ni_nameiop = LOOKUP | FOLLOW;
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ndp->ni_segflg = UIO_USERSPACE;
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ndp->ni_dirp = args.fspec;
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scred = p->p_ucred; /* XXX */
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error = namei(ndp, p);
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p->p_ucred = scred; /* XXX */
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crfree(cred); /* XXX */
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if (error != 0)
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return error;
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/*
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* Be sure they've given us a block device to treat as a
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* filesystem. And, that its major number is within the bdevsw
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* table.
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*/
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devvp = ndp->ni_vp;
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if (devvp->v_type != VBLK) {
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vrele(devvp); /* namei() acquires this? */
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return ENOTBLK;
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}
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if (major(devvp->v_rdev) >= nblkdev) {
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vrele(devvp);
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return ENXIO;
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}
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/*
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* If this is an update, then make sure the vnode for the block
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* special device is the same as the one our filesystem is in.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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if (devvp != pmp->pm_devvp)
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error = EINVAL;
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else
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vrele(devvp);
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}
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else {
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/*
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* Well, it's not an update, it's a real mount request.
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* Time to get dirty.
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*/
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error = mountmsdosfs(devvp, mp, p);
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}
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if (error) {
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vrele(devvp);
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return error;
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}
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/*
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* Copy in the name of the directory the filesystem is to be
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* mounted on. Then copy in the name of the block special file
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* representing the filesystem being mounted. And we clear the
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* remainder of the character strings to be tidy. Set up the
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* user id/group id/mask as specified by the user. Then, we try to
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* fill in the filesystem stats structure as best we can with
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* whatever applies from a dos file system.
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*/
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pmp = (struct msdosfsmount *) mp->mnt_data;
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copyinstr(path, (caddr_t) mp->mnt_stat.f_mntonname,
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sizeof(mp->mnt_stat.f_mntonname) - 1, &size);
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bzero(mp->mnt_stat.f_mntonname + size,
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sizeof(mp->mnt_stat.f_mntonname) - size);
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copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntfromname + size,
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MNAMELEN - size);
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pmp->pm_mounter = p->p_cred->p_ruid;
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pmp->pm_gid = args.gid;
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pmp->pm_uid = args.uid;
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pmp->pm_mask = args.mask;
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(void) msdosfs_statfs(mp, &mp->mnt_stat, p);
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#if defined(MSDOSFSDEBUG)
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printf("msdosfs_mount(): mp %x, pmp %x, inusemap %x\n", mp, pmp, pmp->pm_inusemap);
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#endif /* defined(MSDOSFSDEBUG) */
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return 0;
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}
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int
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mountmsdosfs(devvp, mp, p)
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struct vnode *devvp;
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struct mount *mp;
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struct proc *p;
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{
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int i;
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int bpc;
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int bit;
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int error = 0;
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int needclose;
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int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
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dev_t dev = devvp->v_rdev;
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union bootsector *bsp;
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struct msdosfsmount *pmp = NULL;
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struct buf *bp0 = NULL;
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struct byte_bpb33 *b33;
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struct byte_bpb50 *b50;
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/*
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* Multiple mounts of the same block special file aren't allowed.
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* Make sure no one else has the special file open. And flush any
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* old buffers from this filesystem. Presumably this prevents us
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* from running into buffers that are the wrong blocksize. NOTE:
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* mountedon() is a part of the ufs filesystem. If the ufs
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* filesystem is not gen'ed into the system we will get an
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* unresolved reference.
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*/
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if (error = mountedon(devvp)) {
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return error;
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}
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if (vcount(devvp) > 1)
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return EBUSY;
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vinvalbuf(devvp, 1);
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/*
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* Now open the block special file.
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*/
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if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p))
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return error;
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needclose = 1;
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#if defined(HDSUPPORT)
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/*
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* Put this in when we support reading dos filesystems from
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* partitioned harddisks.
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*/
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if (VOP_IOCTL(devvp, DIOCGPART, &msdosfspart, FREAD, NOCRED, p) == 0) {
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}
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#endif /* defined(HDSUPPORT) */
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/*
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* Read the boot sector of the filesystem, and then check the boot
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* signature. If not a dos boot sector then error out. We could
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* also add some checking on the bsOemName field. So far I've seen
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* the following values: "IBM 3.3" "MSDOS3.3" "MSDOS5.0"
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*/
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if (error = bread(devvp, 0, 512, NOCRED, &bp0))
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goto error_exit;
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bp0->b_flags |= B_AGE;
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bsp = (union bootsector *) bp0->b_un.b_addr;
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b33 = (struct byte_bpb33 *) bsp->bs33.bsBPB;
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b50 = (struct byte_bpb50 *) bsp->bs50.bsBPB;
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#ifdef MSDOSFS_CHECKSIG
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if (bsp->bs50.bsBootSectSig != BOOTSIG) {
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error = EINVAL;
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goto error_exit;
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}
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#endif
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if ( bsp->bs50.bsJump[0] != 0xe9 &&
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(bsp->bs50.bsJump[0] != 0xeb || bsp->bs50.bsJump[2] != 0x90)) {
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error = EINVAL;
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goto error_exit;
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}
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pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
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pmp->pm_inusemap = NULL;
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pmp->pm_fmod = 0;
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pmp->pm_mountp = mp;
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/*
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* Compute several useful quantities from the bpb in the
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* bootsector. Copy in the dos 5 variant of the bpb then fix up
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* the fields that are different between dos 5 and dos 3.3.
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*/
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pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
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pmp->pm_SectPerClust = b50->bpbSecPerClust;
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pmp->pm_ResSectors = getushort(b50->bpbResSectors);
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pmp->pm_FATs = b50->bpbFATs;
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pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
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pmp->pm_Sectors = getushort(b50->bpbSectors);
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pmp->pm_Media = b50->bpbMedia;
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pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
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pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
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pmp->pm_Heads = getushort(b50->bpbHeads);
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/* XXX - We should probably check more values here */
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if (!pmp->pm_BytesPerSec || !pmp->pm_SectPerClust ||
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!pmp->pm_Heads || pmp->pm_Heads > 255 ||
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!pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
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error = EINVAL;
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goto error_exit;
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}
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if (pmp->pm_Sectors == 0) {
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pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
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pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
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}
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else {
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pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
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pmp->pm_HugeSectors = pmp->pm_Sectors;
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}
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pmp->pm_fatblk = pmp->pm_ResSectors;
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pmp->pm_rootdirblk = pmp->pm_fatblk +
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(pmp->pm_FATs * pmp->pm_FATsecs);
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pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry))
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/
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pmp->pm_BytesPerSec;/* in sectors */
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pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
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pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
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pmp->pm_SectPerClust;
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pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
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pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec;
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if (FAT12(pmp))
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/*
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* This will usually be a floppy disk. This size makes sure
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* that one fat entry will not be split across multiple
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* blocks.
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*/
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pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
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else
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/*
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* This will usually be a hard disk. Reading or writing one
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* block should be quite fast.
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*/
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pmp->pm_fatblocksize = MAXBSIZE;
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pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec;
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if ((pmp->pm_rootdirsize % pmp->pm_SectPerClust) != 0)
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printf("mountmsdosfs(): root directory is not a multiple of the clustersize in length\n");
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/*
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* Compute mask and shift value for isolating cluster relative byte
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* offsets and cluster numbers from a file offset.
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*/
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bpc = pmp->pm_SectPerClust * pmp->pm_BytesPerSec;
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pmp->pm_bpcluster = bpc;
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pmp->pm_depclust = bpc / sizeof(struct direntry);
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pmp->pm_crbomask = bpc - 1;
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if (bpc == 0) {
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error = EINVAL;
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goto error_exit;
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}
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bit = 1;
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for (i = 0; i < 32; i++) {
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if (bit & bpc) {
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if (bit ^ bpc) {
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error = EINVAL;
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goto error_exit;
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}
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pmp->pm_cnshift = i;
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break;
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}
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bit <<= 1;
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}
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pmp->pm_brbomask = 0x01ff; /* 512 byte blocks only (so far) */
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pmp->pm_bnshift = 9; /* shift right 9 bits to get bn */
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/*
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* Release the bootsector buffer.
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*/
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brelse(bp0);
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bp0 = NULL;
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/*
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* Allocate memory for the bitmap of allocated clusters, and then
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* fill it in.
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*/
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pmp->pm_inusemap = malloc((pmp->pm_maxcluster >> 3) + 1,
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M_MSDOSFSFAT, M_WAITOK);
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/*
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* fillinusemap() needs pm_devvp.
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*/
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pmp->pm_dev = dev;
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pmp->pm_devvp = devvp;
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/*
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* Have the inuse map filled in.
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*/
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error = fillinusemap(pmp);
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if (error)
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goto error_exit;
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/*
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* If they want fat updates to be synchronous then let them suffer
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* the performance degradation in exchange for the on disk copy of
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* the fat being correct just about all the time. I suppose this
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* would be a good thing to turn on if the kernel is still flakey.
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*/
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pmp->pm_waitonfat = mp->mnt_flag & MNT_SYNCHRONOUS;
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/*
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* Finish up.
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*/
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pmp->pm_ronly = ronly;
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if (ronly == 0)
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pmp->pm_fmod = 1;
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mp->mnt_data = (qaddr_t) pmp;
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mp->mnt_stat.f_fsid.val[0] = (long) dev;
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mp->mnt_stat.f_fsid.val[1] = MOUNT_MSDOS;
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mp->mnt_flag |= MNT_LOCAL;
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#if defined(QUOTA)
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/*
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* If we ever do quotas for DOS filesystems this would be a place
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* to fill in the info in the msdosfsmount structure. You dolt,
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* quotas on dos filesystems make no sense because files have no
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* owners on dos filesystems. of course there is some empty space
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* in the directory entry where we could put uid's and gid's.
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*/
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#endif /* defined(QUOTA) */
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devvp->v_specflags |= SI_MOUNTEDON;
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return 0;
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error_exit:;
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if (bp0)
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brelse(bp0);
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if (needclose)
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(void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE,
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NOCRED, p);
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if (pmp) {
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if (pmp->pm_inusemap)
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free((caddr_t) pmp->pm_inusemap, M_MSDOSFSFAT);
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free((caddr_t) pmp, M_MSDOSFSMNT);
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mp->mnt_data = (qaddr_t) 0;
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}
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return error;
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}
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int
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msdosfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return 0;
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}
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/*
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* Unmount the filesystem described by mp.
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*/
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int
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msdosfs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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int flags = 0;
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int error;
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struct msdosfsmount *pmp = (struct msdosfsmount *) mp->mnt_data;
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struct vnode *vp = pmp->pm_devvp;
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/* only the mounter, or superuser can unmount */
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if ((p->p_cred->p_ruid != pmp->pm_mounter) &&
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(error = suser(p->p_ucred, &p->p_acflag)))
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return (error);
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|
|
if (mntflags & MNT_FORCE) {
|
|
if (!msdosfsdoforce)
|
|
return EINVAL;
|
|
flags |= FORCECLOSE;
|
|
}
|
|
mntflushbuf(mp, 0);
|
|
if (mntinvalbuf(mp))
|
|
return EBUSY;
|
|
#if defined(QUOTA)
|
|
#endif /* defined(QUOTA) */
|
|
if (error = vflush(mp, NULLVP, flags))
|
|
return error;
|
|
pmp->pm_devvp->v_specflags &= ~SI_MOUNTEDON;
|
|
#if defined(MSDOSFSDEBUG)
|
|
printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
|
|
printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n",
|
|
vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
|
|
printf("lastr %d, id %d, mount %08x, op %08x\n",
|
|
vp->v_lastr, vp->v_id, vp->v_mount, vp->v_op);
|
|
printf("freef %08x, freeb %08x, mountf %08x, mountb %08x\n",
|
|
vp->v_freef, vp->v_freeb, vp->v_mountf, vp->v_mountb);
|
|
printf("cleanblkhd %08x, dirtyblkhd %08x, numoutput %d, type %d\n",
|
|
vp->v_cleanblkhd, vp->v_dirtyblkhd, vp->v_numoutput, vp->v_type);
|
|
printf("union %08x, tag %d, data[0] %08x, data[1] %08x\n",
|
|
vp->v_socket, vp->v_tag, vp->v_data[0], vp->v_data[1]);
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
error = VOP_CLOSE(pmp->pm_devvp, pmp->pm_ronly ? FREAD : FREAD | FWRITE,
|
|
NOCRED, p);
|
|
vrele(pmp->pm_devvp);
|
|
free((caddr_t) pmp->pm_inusemap, M_MSDOSFSFAT);
|
|
free((caddr_t) pmp, M_MSDOSFSMNT);
|
|
mp->mnt_data = (qaddr_t) 0;
|
|
mp->mnt_flag &= ~MNT_LOCAL;
|
|
return error;
|
|
}
|
|
|
|
int
|
|
msdosfs_root(mp, vpp)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct denode *ndep;
|
|
struct msdosfsmount *pmp = (struct msdosfsmount *) (mp->mnt_data);
|
|
int error;
|
|
|
|
error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, NULL, &ndep);
|
|
#if defined(MSDOSFSDEBUG)
|
|
printf("msdosfs_root(); mp %08x, pmp %08x, ndep %08x, vp %08x\n",
|
|
mp, pmp, ndep, DETOV(ndep));
|
|
#endif /* defined(MSDOSFSDEBUG) */
|
|
if (error == 0)
|
|
*vpp = DETOV(ndep);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
msdosfs_quotactl(mp, cmds, uid, arg, p)
|
|
struct mount *mp;
|
|
int cmds;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct proc *p;
|
|
{
|
|
#if defined(QUOTA)
|
|
#else
|
|
return EOPNOTSUPP;
|
|
#endif /* defined(QUOTA) */
|
|
}
|
|
|
|
int
|
|
msdosfs_statfs(mp, sbp, p)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct proc *p;
|
|
{
|
|
struct msdosfsmount *pmp = (struct msdosfsmount *) mp->mnt_data;
|
|
|
|
/*
|
|
* Fill in the stat block.
|
|
*/
|
|
sbp->f_type = MOUNT_MSDOS;
|
|
sbp->f_fsize = pmp->pm_bpcluster;
|
|
sbp->f_bsize = pmp->pm_bpcluster;
|
|
sbp->f_blocks = pmp->pm_nmbrofclusters;
|
|
sbp->f_bfree = pmp->pm_freeclustercount;
|
|
sbp->f_bavail = pmp->pm_freeclustercount;
|
|
sbp->f_files = pmp->pm_RootDirEnts;
|
|
sbp->f_ffree = 0; /* what to put in here? */
|
|
|
|
/*
|
|
* Copy the mounted on and mounted from names into the passed in
|
|
* stat block, if it is not the one in the mount structure.
|
|
*/
|
|
if (sbp != &mp->mnt_stat) {
|
|
bcopy((caddr_t) mp->mnt_stat.f_mntonname,
|
|
(caddr_t) & sbp->f_mntonname[0], MNAMELEN);
|
|
bcopy((caddr_t) mp->mnt_stat.f_mntfromname,
|
|
(caddr_t) & sbp->f_mntfromname[0], MNAMELEN);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
msdosfs_sync(mp, waitfor)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
{
|
|
struct vnode *vp;
|
|
struct denode *dep;
|
|
struct msdosfsmount *pmp;
|
|
int error;
|
|
int allerror = 0;
|
|
|
|
pmp = (struct msdosfsmount *) mp->mnt_data;
|
|
|
|
/*
|
|
* If we ever switch to not updating all of the fats all the time,
|
|
* this would be the place to update them from the first one.
|
|
*/
|
|
if (pmp->pm_fmod)
|
|
if (pmp->pm_ronly)
|
|
panic("msdosfs_sync: rofs mod");
|
|
else {
|
|
/* update fats here */
|
|
}
|
|
|
|
/*
|
|
* Go thru in memory denodes and write them out along with
|
|
* unwritten file blocks.
|
|
*/
|
|
loop:
|
|
for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) {
|
|
if (vp->v_mount != mp) /* not ours anymore */
|
|
goto loop;
|
|
if (VOP_ISLOCKED(vp)) /* file is busy */
|
|
continue;
|
|
dep = VTODE(vp);
|
|
if ((dep->de_flag & DEUPD) == 0 && vp->v_dirtyblkhd == NULL)
|
|
continue;
|
|
if (vget(vp)) /* not there anymore? */
|
|
goto loop;
|
|
if (vp->v_dirtyblkhd) /* flush dirty file blocks */
|
|
vflushbuf(vp, 0);
|
|
if ((dep->de_flag & DEUPD) &&
|
|
(error = deupdat(dep, &time, 0)))
|
|
allerror = error;
|
|
vput(vp); /* done with this one */
|
|
}
|
|
|
|
/*
|
|
* Flush filesystem control info.
|
|
*/
|
|
vflushbuf(pmp->pm_devvp, waitfor == MNT_WAIT ? B_SYNC : 0);
|
|
return allerror;
|
|
}
|
|
|
|
int
|
|
msdosfs_fhtovp(mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct msdosfsmount *pmp = (struct msdosfsmount *) mp->mnt_data;
|
|
struct defid *defhp = (struct defid *) fhp;
|
|
struct denode *dep;
|
|
int error;
|
|
|
|
error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs,
|
|
NULL, &dep);
|
|
if (error)
|
|
return (error);
|
|
*vpp = DETOV(dep);
|
|
return (0);
|
|
}
|
|
|
|
|
|
int
|
|
msdosfs_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
struct denode *dep = VTODE(vp);
|
|
struct defid *defhp = (struct defid *) fhp;
|
|
|
|
defhp->defid_len = sizeof(struct defid);
|
|
defhp->defid_dirclust = dep->de_dirclust;
|
|
defhp->defid_dirofs = dep->de_diroffset;
|
|
/* defhp->defid_gen = ip->i_gen; */
|
|
return (0);
|
|
}
|
|
|
|
struct vfsops msdosfs_vfsops = {
|
|
msdosfs_mount,
|
|
msdosfs_start,
|
|
msdosfs_unmount,
|
|
msdosfs_root,
|
|
msdosfs_quotactl,
|
|
msdosfs_statfs,
|
|
msdosfs_sync,
|
|
msdosfs_fhtovp,
|
|
msdosfs_vptofh,
|
|
msdosfs_init
|
|
};
|