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NetBSD/sys/msdosfs/msdosfs_vnops.c

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/* $NetBSD: msdosfs_vnops.c,v 1.25 1994/10/30 21:48:39 cgd Exp $ */
/*-
* Copyright (C) 1994 Wolfgang Solfrank.
* Copyright (C) 1994 TooLs GmbH.
* All rights reserved.
* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Written by Paul Popelka (paulp@uts.amdahl.com)
*
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
*
* This software is provided "as is".
*
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
*
* October 1992
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
#include <sys/kernel.h>
#include <sys/file.h> /* define FWRITE ... */
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
#include <sys/malloc.h>
#include <sys/dir.h> /* defines dirent structure */
#include <msdosfs/bpb.h>
#include <msdosfs/direntry.h>
#include <msdosfs/denode.h>
#include <msdosfs/msdosfsmount.h>
#include <msdosfs/fat.h>
/*
* Some general notes:
*
* In the ufs filesystem the inodes, superblocks, and indirect blocks are
* read/written using the vnode for the filesystem. Blocks that represent
* the contents of a file are read/written using the vnode for the file
* (including directories when they are read/written as files). This
* presents problems for the dos filesystem because data that should be in
* an inode (if dos had them) resides in the directory itself. Since we
* must update directory entries without the benefit of having the vnode
* for the directory we must use the vnode for the filesystem. This means
* that when a directory is actually read/written (via read, write, or
* readdir, or seek) we must use the vnode for the filesystem instead of
* the vnode for the directory as would happen in ufs. This is to insure we
* retreive the correct block from the buffer cache since the hash value is
* based upon the vnode address and the desired block number.
*/
/*
* Create a regular file. On entry the directory to contain the file being
* created is locked. We must release before we return. We must also free
* the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or
* only if the SAVESTART bit in cn_flags is clear on success.
*/
int
msdosfs_create(ap)
struct vop_create_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
struct componentname *cnp = ap->a_cnp;
struct denode ndirent;
struct denode *dep;
struct denode *pdep = VTODE(ap->a_dvp);
struct timespec ts;
int error;
#ifdef MSDOSFS_DEBUG
printf("msdosfs_create(cnp %08x, vap %08x\n", cnp, ap->a_vap);
#endif
/*
* 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 && pdep->de_fndclust == (u_long)-1) {
error = ENOSPC;
goto bad;
}
bzero(&ndirent, sizeof(ndirent));
TIMEVAL_TO_TIMESPEC(&time, &ts);
unix2dostime(&ts, &ndirent.de_Date, &ndirent.de_Time);
/*
* Create a directory entry for the file, then call createde() to
* have it installed. NOTE: DOS files are always executable. We
* use the absence of the owner write bit to make the file
* readonly.
*/
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("msdosfs_create: no name");
#endif
unix2dosfn((u_char *)cnp->cn_nameptr, ndirent.de_Name, cnp->cn_namelen);
ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 0 : ATTR_READONLY;
ndirent.de_StartCluster = 0;
ndirent.de_FileSize = 0;
ndirent.de_dev = pdep->de_dev;
ndirent.de_devvp = pdep->de_devvp;
if (error = createde(&ndirent, pdep, &dep))
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(ap->a_dvp);
*ap->a_vpp = DETOV(dep);
return (0);
bad:
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(ap->a_dvp);
return (error);
}
int
msdosfs_mknod(ap)
struct vop_mknod_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
int error;
switch (ap->a_vap->va_type) {
case VDIR:
return (msdosfs_mkdir((struct vop_mkdir_args *)ap));
break;
case VREG:
return (msdosfs_create((struct vop_create_args *)ap));
break;
default:
FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
vput(ap->a_dvp);
return (EINVAL);
}
/* NOTREACHED */
}
int
msdosfs_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (0);
}
int
msdosfs_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(vp);
struct timespec ts;
if (vp->v_usecount > 1 && !(dep->de_flag & DE_LOCKED)) {
TIMEVAL_TO_TIMESPEC(&time, &ts);
DE_TIMES(dep, &ts);
}
return (0);
}
int
msdosfs_access(ap)
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct denode *dep = VTODE(ap->a_vp);
struct msdosfsmount *pmp = dep->de_pmp;
struct ucred *cred = ap->a_cred;
mode_t dosmode, mask, mode = ap->a_mode;
register gid_t *gp;
int i;
dosmode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
dosmode &= pmp->pm_mask;
/* User id 0 always gets access. */
if (cred->cr_uid == 0)
return (0);
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == pmp->pm_uid) {
if (mode & VEXEC)
mask |= S_IXUSR;
if (mode & VREAD)
mask |= S_IRUSR;
if (mode & VWRITE)
mask |= S_IWUSR;
return ((dosmode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check the groups. */
for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
if (pmp->pm_gid == *gp) {
if (mode & VEXEC)
mask |= S_IXGRP;
if (mode & VREAD)
mask |= S_IRGRP;
if (mode & VWRITE)
mask |= S_IWGRP;
return ((dosmode & mask) == mask ? 0 : EACCES);
}
/* Otherwise, check everyone else. */
if (mode & VEXEC)
mask |= S_IXOTH;
if (mode & VREAD)
mask |= S_IROTH;
if (mode & VWRITE)
mask |= S_IWOTH;
return ((dosmode & mask) == mask ? 0 : EACCES);
}
int
msdosfs_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
u_int cn;
struct denode *dep = VTODE(ap->a_vp);
struct vattr *vap = ap->a_vap;
struct timespec ts;
TIMEVAL_TO_TIMESPEC(&time, &ts);
DE_TIMES(dep, &ts);
vap->va_fsid = dep->de_dev;
/*
* The following computation of the fileid must be the same as that
* used in msdosfs_readdir() to compute d_fileno. If not, pwd
* doesn't work.
*/
if (dep->de_Attributes & ATTR_DIRECTORY) {
if ((cn = dep->de_StartCluster) == MSDOSFSROOT)
cn = 1;
} else {
if ((cn = dep->de_dirclust) == MSDOSFSROOT)
cn = 1;
cn = (cn << 16) | (dep->de_diroffset & 0xffff);
}
vap->va_fileid = cn;
vap->va_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) |
((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH));
vap->va_mode &= dep->de_pmp->pm_mask;
if (dep->de_Attributes & ATTR_DIRECTORY)
vap->va_mode |= S_IFDIR;
vap->va_nlink = 1;
vap->va_gid = dep->de_pmp->pm_gid;
vap->va_uid = dep->de_pmp->pm_uid;
vap->va_rdev = 0;
vap->va_size = dep->de_FileSize;
dos2unixtime(dep->de_Date, dep->de_Time, &vap->va_atime);
vap->va_mtime = vap->va_atime;
#ifndef MSDOSFS_NODIRMOD
if (vap->va_mode & S_IFDIR)
TIMEVAL_TO_TIMESPEC(&time, &vap->va_mtime);
#endif
vap->va_ctime = vap->va_atime;
vap->va_flags = dep->de_flag;
vap->va_gen = 0;
vap->va_blocksize = dep->de_pmp->pm_bpcluster;
vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) &
~(dep->de_pmp->pm_crbomask);
vap->va_type = ap->a_vp->v_type;
return (0);
}
int
msdosfs_setattr(ap)
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
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) ||
(vap->va_flags != 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);
}
if (vap->va_size != VNOVAL) {
if (ap->a_vp->v_type == VDIR)
return (EISDIR);
if (error = detrunc(dep, (u_long)vap->va_size, 0, cred, ap->a_p))
return (error);
}
if (vap->va_mtime.ts_sec != VNOVAL) {
dep->de_flag |= DE_UPDATE;
if (error = deupdat(dep, &vap->va_mtime, 1))
return (error);
}
/*
* DOS files only have the ability to have thier writability
* attribute set, so we use the owner write bit to set the readonly
* attribute.
*/
if (vap->va_mode != (mode_t)VNOVAL) {
/* 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_UPDATE;
}
return (0);
}
int
msdosfs_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
int error = 0;
int diff;
int isadir;
long n;
long on;
daddr_t lbn;
daddr_t rablock;
struct buf *bp;
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(vp);
struct msdosfsmount *pmp = dep->de_pmp;
struct uio *uio = ap->a_uio;
/*
* If they didn't ask for any data, then we are done.
*/
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
isadir = dep->de_Attributes & ATTR_DIRECTORY;
do {
lbn = uio->uio_offset >> pmp->pm_cnshift;
on = uio->uio_offset & pmp->pm_crbomask;
n = min((u_long) (pmp->pm_bpcluster - on), uio->uio_resid);
diff = dep->de_FileSize - uio->uio_offset;
if (diff <= 0)
return (0);
/* convert cluster # to block # if a directory */
if (isadir) {
error = pcbmap(dep, lbn, &lbn, 0);
if (error)
return (error);
}
if (diff < n)
n = diff;
/*
* If we are operating on a directory file then be sure to
* do i/o with the vnode for the filesystem instead of the
* vnode for the directory.
*/
if (isadir) {
error = bread(pmp->pm_devvp, lbn, pmp->pm_bpcluster,
NOCRED, &bp);
} else {
rablock = lbn + 1;
if (vp->v_lastr + 1 == lbn &&
rablock * pmp->pm_bpcluster < dep->de_FileSize) {
error = breada(vp, lbn, pmp->pm_bpcluster,
rablock, pmp->pm_bpcluster, NOCRED, &bp);
} else {
error = bread(vp, lbn, pmp->pm_bpcluster, NOCRED,
&bp);
}
vp->v_lastr = lbn;
}
n = min(n, pmp->pm_bpcluster - bp->b_resid);
if (error) {
brelse(bp);
return (error);
}
error = uiomove(bp->b_data + on, (int) n, uio);
/*
* If we have read everything from this block or have read
* to end of file then we are done with this block. Mark
* it to say the buffer can be reused if need be.
*/
#if 0
if (n + on == pmp->pm_bpcluster ||
uio->uio_offset == dep->de_FileSize)
bp->b_flags |= B_AGE;
#endif
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
}
/*
* Write data to a file or directory.
*/
int
msdosfs_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
int n;
int isadir;
int croffset;
int resid;
u_long osize;
int error;
u_long count;
daddr_t bn, lastcn;
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;
struct timespec ts;
#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;
isadir = 0;
thisvp = vp;
break;
case VDIR:
if ((ioflag & IO_SYNC) == 0)
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.
*/
if (uio->uio_offset > dep->de_FileSize) {
if (error = deextend(dep, uio->uio_offset, cred))
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 {
bn = de_blk(pmp, uio->uio_offset);
if (isadir) {
if (error = pcbmap(dep, bn, &bn, 0))
break;
} else if (bn > lastcn) {
error = ENOSPC;
break;
}
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 (!isadir) {
if (bp->b_blkno == bp->b_lblkno) {
if (error = pcbmap(dep, bp->b_lblkno,
&bp->b_blkno, 0))
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.
*/
if (error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &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;
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_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) {
bp->b_flags |= B_AGE;
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 {
TIMEVAL_TO_TIMESPEC(&time, &ts);
error = deupdat(dep, &ts, 1);
}
return (error);
}
int
msdosfs_ioctl(ap)
struct vop_ioctl_args /* {
struct vnode *a_vp;
u_long a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (ENOTTY);
}
int
msdosfs_select(ap)
struct vop_select_args /* {
struct vnode *a_vp;
int a_which;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (1); /* DOS filesystems never block? */
}
int
msdosfs_mmap(ap)
struct vop_mmap_args /* {
struct vnode *a_vp;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
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(ap)
struct vop_fsync_args /* {
struct vnode *a_vp;
struct ucred *a_cred;
int a_waitfor;
struct proc *a_p;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct timespec ts;
vflushbuf(vp, ap->a_waitfor == MNT_WAIT);
TIMEVAL_TO_TIMESPEC(&time, &ts);
return (deupdat(VTODE(vp), &ts, ap->a_waitfor == MNT_WAIT));
}
/*
* Now the whole work of extending a file is done in the write function.
* So nothing to do here.
*/
int
msdosfs_seek(ap)
struct vop_seek_args /* {
struct vnode *a_vp;
off_t a_oldoff;
off_t a_newoff;
struct ucred *a_cred;
} */ *ap;
{
return (0);
}
int
msdosfs_remove(ap)
struct vop_remove_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
struct denode *dep = VTODE(ap->a_vp);
struct denode *ddep = VTODE(ap->a_dvp);
int error;
error = removede(ddep, dep);
#ifdef MSDOSFS_DEBUG
printf("msdosfs_remove(), dep %08x, v_usecount %d\n", dep, ap->a_vp->v_usecount);
#endif
if (ddep == dep)
vrele(ap->a_vp);
else
vput(ap->a_vp); /* causes msdosfs_inactive() to be called
* via vrele() */
vput(ap->a_dvp);
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(ap)
struct vop_link_args /* {
struct vnode *a_vp;
struct vnode *a_tdvp;
struct componentname *a_cnp;
} */ *ap;
{
return (VOP_ABORTOP(ap->a_vp, ap->a_cnp));
}
/*
* 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
* componentname structures is freed, there may be some memory bleeding
* for each rename done.
*/
int
msdosfs_rename(ap)
struct vop_rename_args /* {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
} */ *ap;
{
struct vnode *tvp = ap->a_tvp;
register struct vnode *tdvp = ap->a_tdvp;
struct vnode *fvp = ap->a_fvp;
register struct vnode *fdvp = ap->a_fdvp;
register struct componentname *tcnp = ap->a_tcnp;
register struct componentname *fcnp = ap->a_fcnp;
register struct denode *ip, *xp, *dp;
u_char toname[11];
int doingdirectory = 0, newparent = 0;
int error;
u_long cn;
daddr_t bn;
struct msdosfsmount *pmp;
struct direntry *dotdotp;
struct direntry *ep;
struct buf *bp;
pmp = VFSTOMSDOSFS(fdvp->v_mount);
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("msdosfs_rename: no name");
#endif
/*
* Check for cross-device rename.
*/
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
abortit:
VOP_ABORTOP(tdvp, tcnp);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp);
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* Convert the filename in tcnp into a dos filename. We copy this
* into the denode and directory entry for the destination
* file/directory.
*/
unix2dosfn((u_char *)tcnp->cn_nameptr, toname, tcnp->cn_namelen);
/* */
if (error = VOP_LOCK(fvp))
goto abortit;
dp = VTODE(fdvp);
ip = VTODE(fvp);
/*
* 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 (ip->de_Attributes & ATTR_DIRECTORY) {
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
dp == ip || (fcnp->cn_flags & ISDOTDOT)) {
VOP_UNLOCK(fvp);
error = EINVAL;
goto abortit;
}
doingdirectory++;
}
/*
* When the target exists, both the directory
* and target vnodes are returned locked.
*/
dp = VTODE(tdvp);
xp = tvp ? VTODE(tvp) : NULL;
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory heirarchy above the target, as this would
* orphan everything below the source directory. Also
* the user must have write permission in the source so
* as to be able to change "..". We must repeat the call
* to namei, as the parent directory is unlocked by the
* call to doscheckpath().
*/
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
VOP_UNLOCK(fvp);
if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
newparent = 1;
if (doingdirectory && newparent) {
if (error) /* write access check above */
goto bad;
if (xp != NULL)
vput(tvp);
/* doscheckpath() vput()'s dp */
if (error = doscheckpath(ip, dp))
goto out;
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("msdosfs_rename: lost to startdir");
if (error = relookup(tdvp, &tvp, tcnp))
goto out;
dp = VTODE(tdvp);
xp = tvp ? VTODE(tvp) : NULL;
}
if (xp != NULL) {
u_long to_dirclust, to_diroffset;
/*
* Target must be empty if a directory and have no links
* to it. Also, ensure source and target are compatible
* (both directories, or both not directories).
*/
if (xp->de_Attributes & ATTR_DIRECTORY) {
if (!dosdirempty(xp)) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(tdvp);
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
to_dirclust = xp->de_dirclust;
to_diroffset = xp->de_diroffset;
if (error = removede(dp, xp))
goto bad;
vput(tvp);
xp = NULL;
/*
* Remember where the slot was for createde().
*/
dp->de_fndclust = to_dirclust;
dp->de_fndoffset = 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.
*/
VOP_LOCK(fvp);
if (newparent == 0) {
if (error = readep(dp->de_pmp,
ip->de_dirclust,
ip->de_diroffset,
&bp, &ep)) {
VOP_UNLOCK(fvp);
goto bad;
}
bcopy(toname, ep->deName, 11);
if (error = bwrite(bp)) {
VOP_UNLOCK(fvp);
goto bad;
}
bcopy(toname, ip->de_Name, 11); /* update denode */
} else {
struct denode *zp;
/*
* 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.
*/
bcopy(toname, ip->de_Name, 11); /* update denode */
if (error = createde(ip, dp, (struct denode **)0)) {
/* XXX should put back filename */
VOP_UNLOCK(fvp);
goto bad;
}
VOP_LOCK(fdvp);
zp = VTODE(fdvp);
if (error = readep(zp->de_pmp, zp->de_fndclust, zp->de_fndoffset,
&bp, &ep)) {
VOP_UNLOCK(fvp);
VOP_UNLOCK(fdvp);
goto bad;
}
ep->deName[0] = SLOT_DELETED;
if (error = bwrite(bp)) {
VOP_UNLOCK(fvp);
VOP_UNLOCK(fdvp);
goto bad;
}
ip->de_dirclust = dp->de_fndclust;
ip->de_diroffset = dp->de_fndoffset;
reinsert(ip);
VOP_UNLOCK(fdvp);
}
/*
* If we moved a directory to a new parent directory, then we must
* fixup the ".." entry in the moved directory.
*/
if (doingdirectory && newparent) {
cn = ip->de_StartCluster;
if (cn == MSDOSFSROOT) {
/* this should never happen */
panic("msdosfs_rename: updating .. in root directory?\n");
} else
bn = cntobn(pmp, cn);
if (error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, NOCRED,
&bp)) {
/* XXX should really panic here, fs is corrupt */
VOP_UNLOCK(fvp);
goto bad;
}
dotdotp = (struct direntry *)bp->b_data + 1;
putushort(dotdotp->deStartCluster, dp->de_StartCluster);
if (error = bwrite(bp)) {
/* XXX should really panic here, fs is corrupt */
VOP_UNLOCK(fvp);
goto bad;
}
}
VOP_UNLOCK(fvp);
bad:
if (xp)
vput(tvp);
vput(tdvp);
out:
vrele(fdvp);
vrele(fvp);
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 */
210, 4, 210, 4, /* time and date */
0, 0, /* startcluster */
0, 0, 0, 0, /* filesize */
".. ", " ", /* the .. entry */
ATTR_DIRECTORY, /* file attribute */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* resevered */
210, 4, 210, 4, /* time and date */
0, 0, /* startcluster */
0, 0, 0, 0, /* filesize */
};
int
msdosfs_mkdir(ap)
struct vop_mkdir_args /* {
struct vnode *a_dvp;
struvt vnode **a_vpp;
struvt componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
struct componentname *cnp = ap->a_cnp;
struct denode ndirent;
struct denode *dep;
struct denode *pdep = VTODE(ap->a_dvp);
struct timespec ts;
int error;
int bn;
u_long newcluster;
struct direntry *denp;
struct msdosfsmount *pmp = pdep->de_pmp;
struct buf *bp;
/*
* 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 && pdep->de_fndclust == (u_long)-1) {
error = ENOSPC;
goto bad2;
}
/*
* Allocate a cluster to hold the about to be created directory.
*/
if (error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL))
goto bad2;
bzero(&ndirent, sizeof(ndirent));
TIMEVAL_TO_TIMESPEC(&time, &ts);
unix2dostime(&ts, &ndirent.de_Date, &ndirent.de_Time);
/*
* 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);
/* always succeeds */
bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0);
bzero(bp->b_data, pmp->pm_bpcluster);
bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate);
denp = (struct direntry *)bp->b_data;
putushort(denp[0].deStartCluster, newcluster);
putushort(denp[0].deDate, ndirent.de_Date);
putushort(denp[0].deTime, ndirent.de_Time);
putushort(denp[1].deStartCluster, pdep->de_StartCluster);
putushort(denp[1].deDate, ndirent.de_Date);
putushort(denp[1].deTime, ndirent.de_Time);
if (error = bwrite(bp))
goto bad;
/*
* Now build up a directory entry pointing to the newly allocated
* cluster. This will be written to an empty slot in the parent
* directory.
*/
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("msdosfs_mkdir: no name");
#endif
unix2dosfn((u_char *)cnp->cn_nameptr, ndirent.de_Name, cnp->cn_namelen);
ndirent.de_Attributes = ATTR_DIRECTORY;
ndirent.de_StartCluster = newcluster;
ndirent.de_FileSize = 0;
ndirent.de_dev = pdep->de_dev;
ndirent.de_devvp = pdep->de_devvp;
if (error = createde(&ndirent, pdep, &dep))
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(ap->a_dvp);
*ap->a_vpp = DETOV(dep);
return (0);
bad:
clusterfree(pmp, newcluster, NULL);
bad2:
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(ap->a_dvp);
return (error);
}
int
msdosfs_rmdir(ap)
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct vnode *dvp = ap->a_dvp;
register struct componentname *cnp = ap->a_cnp;
register struct denode *ip, *dp;
int error;
ip = VTODE(vp);
dp = VTODE(dvp);
/*
* No rmdir "." please.
*/
if (dp == ip) {
vrele(dvp);
vput(vp);
return (EINVAL);
}
/*
* Verify the directory is empty (and valid).
* (Rmdir ".." won't be valid since
* ".." will contain a reference to
* the current directory and thus be
* non-empty.)
*/
error = 0;
if (!dosdirempty(ip)) {
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 vput() 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(dp, ip))
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(dvp);
vput(dvp);
dvp = NULL;
/*
* Truncate the directory that is being deleted.
*/
error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, cnp->cn_proc);
cache_purge(vp);
out:
if (dvp)
vput(dvp);
vput(vp);
return (error);
}
/*
* DOS filesystems don't know what symlinks are.
*/
int
msdosfs_symlink(ap)
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap;
{
register struct vnode *dvp = ap->a_dvp;
register struct componentname *cnp = ap->a_cnp;
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
return (EINVAL);
}
int
msdosfs_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
u_long *a_cookies;
int a_ncookies;
} */ *ap;
{
int error = 0;
int diff;
long n;
long on;
long lost;
long count;
u_long cn;
u_long fileno;
long bias = 0;
daddr_t bn, lbn;
struct buf *bp;
struct denode *dep = VTODE(ap->a_vp);
struct msdosfsmount *pmp = dep->de_pmp;
struct direntry *dentp;
struct dirent dirbuf;
int i = 0;
struct uio *uio = ap->a_uio;
u_long *cookies;
int ncookies;
off_t offset;
#ifdef MSDOSFS_DEBUG
printf("msdosfs_readdir(): vp %08x, uio %08x, cred %08x, eofflagp %08x\n",
ap->a_vp, uio, ap->a_cred, ap->a_eofflag);
#endif
/*
* 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);
offset = uio->uio_offset;
if (count < sizeof(struct direntry) ||
(offset & (sizeof(struct direntry) - 1)))
return (EINVAL);
lost = uio->uio_resid - count;
uio->uio_resid = count;
cookies = ap->a_cookies;
ncookies = ap->a_ncookies;
/*
* 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",
* offset);
*/
bias = 2 * sizeof(struct direntry);
if (offset < bias) {
for (n = offset / sizeof(struct direntry);
n < 2; n++) {
dirbuf.d_fileno = 1;
dirbuf.d_type = DT_DIR;
switch (n) {
case 0:
dirbuf.d_namlen = 1;
strcpy(dirbuf.d_name, ".");
break;
case 1:
dirbuf.d_namlen = 2;
strcpy(dirbuf.d_name, "..");
break;
}
dirbuf.d_reclen = DIRSIZ(&dirbuf);
if (uio->uio_resid < dirbuf.d_reclen)
goto out;
if (error = uiomove(&dirbuf, dirbuf.d_reclen, uio))
goto out;
offset += sizeof(struct direntry);
if (cookies) {
*cookies++ = offset;
if (!--ncookies)
goto out;
}
}
}
}
while (uio->uio_resid > 0) {
lbn = (offset - bias) >> pmp->pm_cnshift;
on = (offset - bias) & pmp->pm_crbomask;
n = min(pmp->pm_bpcluster - on, uio->uio_resid);
diff = dep->de_FileSize - (offset - bias);
if (diff <= 0)
break;
n = min(n, diff);
if (error = pcbmap(dep, lbn, &bn, &cn))
break;
if (error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, NOCRED, &bp)) {
brelse(bp);
return (error);
}
n = min(n, pmp->pm_bpcluster - bp->b_resid);
/*
* Convert from dos directory entries to fs-independent
* directory entries.
*/
for (dentp = (struct direntry *)(bp->b_data + on);
(char *)dentp < bp->b_data + on + n;
dentp++) {
/*
* printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
* dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);
*/
/*
* If this is an unused entry, we can stop.
*/
if (dentp->deName[0] == SLOT_EMPTY) {
brelse(bp);
goto out;
}
/*
* Skip deleted entries and volume labels.
*/
if (dentp->deName[0] == SLOT_DELETED ||
(dentp->deAttributes & ATTR_VOLUME)) {
offset += sizeof(struct direntry);
continue;
}
/*
* 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 */
fileno = getushort(dentp->deStartCluster);
if (fileno == 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_data) & 0xffff);
}
dirbuf.d_fileno = fileno;
dirbuf.d_type =
(dentp->deAttributes & ATTR_DIRECTORY) ? DT_DIR : DT_REG;
dirbuf.d_namlen = dos2unixfn(dentp->deName,
(u_char *)dirbuf.d_name);
dirbuf.d_reclen = DIRSIZ(&dirbuf);
if (uio->uio_resid < dirbuf.d_reclen) {
brelse(bp);
goto out;
}
if (error = uiomove(&dirbuf, dirbuf.d_reclen, uio)) {
brelse(bp);
goto out;
}
offset += sizeof(struct direntry);
if (cookies) {
*cookies++ = offset;
if (--ncookies) {
brelse(bp);
goto out;
}
}
}
#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 ||
dep->de_FileSize - (offset - bias) == 0)
bp->b_flags |= B_AGE;
#endif /* if 0 */
brelse(bp);
}
out:
uio->uio_offset = offset;
uio->uio_resid += lost;
if (dep->de_FileSize - (offset - bias) <= 0)
*ap->a_eofflag = 1;
else
*ap->a_eofflag = 0;
return (error);
}
/*
* DOS filesystems don't know what symlinks are.
*/
int
msdosfs_readlink(ap)
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap;
{
return (EINVAL);
}
int
msdosfs_abortop(ap)
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */ *ap;
{
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
return (0);
}
int
msdosfs_lock(ap)
struct vop_lock_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct denode *dep;
struct proc *p = curproc; /* XXX */
start:
while (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
sleep((caddr_t)vp, PINOD);
}
if (vp->v_tag == VT_NON)
return (ENOENT);
dep = VTODE(vp);
if (dep->de_flag & DE_LOCKED) {
dep->de_flag |= DE_WANTED;
#ifdef DIAGNOSTIC
if (p) {
if (p->p_pid == dep->de_lockholder)
panic("locking against myself");
dep->de_lockwaiter = p->p_pid;
} else
dep->de_lockwaiter = -1;
#endif
(void) sleep((caddr_t)dep, PINOD);
goto start;
}
#ifdef DIAGNOSTIC
dep->de_lockwaiter = 0;
if (dep->de_lockholder != 0)
panic("lockholder (%d) != 0", dep->de_lockholder);
if (p && p->p_pid == 0)
printf("locking by process 0\n");
if (p)
dep->de_lockholder = p->p_pid;
else
dep->de_lockholder = -1;
#endif
dep->de_flag |= DE_LOCKED;
return (0);
}
int
msdosfs_unlock(ap)
struct vop_unlock_args /* {
struct vnode *vp;
} */ *ap;
{
register struct denode *dep = VTODE(ap->a_vp);
struct proc *p = curproc; /* XXX */
#ifdef DIAGNOSTIC
if ((dep->de_flag & DE_LOCKED) == 0) {
vprint("msdosfs_unlock: unlocked denode", ap->a_vp);
panic("msdosfs_unlock NOT LOCKED");
}
if (p && p->p_pid != dep->de_lockholder && p->p_pid > -1 &&
dep->de_lockholder > -1/* && lockcount++ < 100*/)
panic("unlocker (%d) != lock holder (%d)",
p->p_pid, dep->de_lockholder);
dep->de_lockholder = 0;
#endif
dep->de_flag &= ~DE_LOCKED;
if (dep->de_flag & DE_WANTED) {
dep->de_flag &= ~DE_WANTED;
wakeup((caddr_t)dep);
}
return (0);
}
int
msdosfs_islocked(ap)
struct vop_islocked_args /* {
struct vnode *a_vp;
} */ *ap;
{
if (VTODE(ap->a_vp)->de_flag & DE_LOCKED)
return (1);
return (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(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap;
{
struct denode *dep = VTODE(ap->a_vp);
struct msdosfsmount *pmp = dep->de_pmp;
if (ap->a_vpp != NULL)
*ap->a_vpp = dep->de_devvp;
if (ap->a_bnp == NULL)
return (0);
if (ap->a_runp) {
/*
* Sequential clusters should be counted here.
*/
*ap->a_runp = 0;
}
return (pcbmap(dep, ap->a_bn << (pmp->pm_cnshift - pmp->pm_bnshift),
ap->a_bnp, 0));
}
int msdosfs_reallocblks(ap)
struct vop_reallocblks_args /* {
struct vnode *a_vp;
struct cluster_save *a_buflist;
} */ *ap;
{
/* Currently no support for clustering */ /* XXX */
return (ENOSPC);
}
int
msdosfs_strategy(ap)
struct vop_strategy_args /* {
struct buf *a_bp;
} */ *ap;
{
struct buf *bp = ap->a_bp;
struct denode *dep = VTODE(bp->b_vp);
struct msdosfsmount *pmp = dep->de_pmp;
struct vnode *vp;
int error = 0;
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))
bp->b_blkno = -1;
if (bp->b_blkno == -1)
clrbuf(bp);
}
if (bp->b_blkno == -1) {
biodone(bp);
return (error);
}
#ifdef DIAGNOSTIC
#endif
/*
* Read/write the block from/to the disk that contains the desired
* file block.
*/
vp = dep->de_devvp;
bp->b_dev = vp->v_rdev;
VOCALL(vp->v_op, VOFFSET(vop_strategy), ap);
return (0);
}
int
msdosfs_print(ap)
struct vop_print_args /* {
struct vnode *vp;
} */ *ap;
{
struct denode *dep = VTODE(ap->a_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 & DE_LOCKED ? "(LOCKED)" : "");
if (dep->de_lockholder) {
printf(" owner pid %d", dep->de_lockholder);
if (dep->de_lockwaiter)
printf(" waiting pid %d", dep->de_lockwaiter);
printf("\n");
}
}
int
msdosfs_advlock(ap)
struct vop_advlock_args /* {
struct vnode *a_vp;
caddr_t a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap;
{
return (EINVAL); /* we don't do locking yet */
}
int
msdosfs_pathconf(ap)
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap;
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = 1;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = 12;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = PATH_MAX;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 0;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/* Global vfs data structures for msdosfs */
int (**msdosfs_vnodeop_p)();
struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, msdosfs_lookup }, /* lookup */
{ &vop_create_desc, msdosfs_create }, /* create */
{ &vop_mknod_desc, msdosfs_mknod }, /* mknod */
{ &vop_open_desc, msdosfs_open }, /* open */
{ &vop_close_desc, msdosfs_close }, /* close */
{ &vop_access_desc, msdosfs_access }, /* access */
{ &vop_getattr_desc, msdosfs_getattr }, /* getattr */
{ &vop_setattr_desc, msdosfs_setattr }, /* setattr */
{ &vop_read_desc, msdosfs_read }, /* read */
{ &vop_write_desc, msdosfs_write }, /* write */
{ &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */
{ &vop_select_desc, msdosfs_select }, /* select */
{ &vop_mmap_desc, msdosfs_mmap }, /* mmap */
{ &vop_fsync_desc, msdosfs_fsync }, /* fsync */
{ &vop_seek_desc, msdosfs_seek }, /* seek */
{ &vop_remove_desc, msdosfs_remove }, /* remove */
{ &vop_link_desc, msdosfs_link }, /* link */
{ &vop_rename_desc, msdosfs_rename }, /* rename */
{ &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */
{ &vop_symlink_desc, msdosfs_symlink }, /* symlink */
{ &vop_readdir_desc, msdosfs_readdir }, /* readdir */
{ &vop_readlink_desc, msdosfs_readlink }, /* readlink */
{ &vop_abortop_desc, msdosfs_abortop }, /* abortop */
{ &vop_inactive_desc, msdosfs_inactive }, /* inactive */
{ &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */
{ &vop_lock_desc, msdosfs_lock }, /* lock */
{ &vop_unlock_desc, msdosfs_unlock }, /* unlock */
{ &vop_bmap_desc, msdosfs_bmap }, /* bmap */
{ &vop_strategy_desc, msdosfs_strategy }, /* strategy */
{ &vop_print_desc, msdosfs_print }, /* print */
{ &vop_islocked_desc, msdosfs_islocked }, /* islocked */
{ &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, msdosfs_advlock }, /* advlock */
{ &vop_reallocblks_desc, msdosfs_reallocblks }, /* reallocblks */
{ &vop_bwrite_desc, vn_bwrite },
{ (struct vnodeop_desc *)NULL, (int (*)())NULL }
};
struct vnodeopv_desc msdosfs_vnodeop_opv_desc =
{ &msdosfs_vnodeop_p, msdosfs_vnodeop_entries };
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