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This commit was manufactured by cvs2svn to create tag 'FreeBSD-release/1.0'.
[unix-history] / sys / pcfs / pcfs_vnops.c
/*
* 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
*
* $Id$
*/
#include "param.h"
#include "systm.h"
#include "namei.h"
#include "resourcevar.h" /* defines plimit structure in proc struct */
#include "kernel.h"
#include "file.h" /* define FWRITE ... */
#include "stat.h"
#include "buf.h"
#include "proc.h"
#include "mount.h"
#include "vnode.h"
#include "specdev.h" /* defines plimit structure in the proc struct */
#include "malloc.h"
#include "dir.h" /* defines dirent structure */
#include "bpb.h"
#include "direntry.h"
#include "denode.h"
#include "pcfsmount.h"
#include "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 ndp->ni_pnbuf, always on error, or only if the
* SAVESTART bit in ni_nameiop is clear on success.
*/
int
pcfs_create(ndp, vap, p)
struct nameidata *ndp;
struct vattr *vap;
struct proc *p;
{
struct denode ndirent;
struct direntry *ndirp = &ndirent.de_de;
struct denode *dep;
struct denode *pdep = VTODE(ndp->ni_dvp);
int error;
#if defined(PCFSDEBUG)
printf("pcfs_create(ndp %08x, vap %08x, p %08x\n", ndp, vap, p);
#endif /* defined(PCFSDEBUG) */
/*
* 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.
*/
bzero(&ndirent, sizeof(ndirent));
unix2dostime(&time, (union dosdate *)&ndirp->deDate,
(union dostime *)&ndirp->deTime);
unix2dosfn((u_char *)ndp->ni_ptr, ndirp->deName, ndp->ni_namelen);
ndirp->deAttributes = (vap->va_mode & VWRITE) ? 0 : ATTR_READONLY;
ndirp->deStartCluster = 0;
ndirp->deFileSize = 0;
ndirent.de_pmp = pdep->de_pmp;
ndirent.de_dev = pdep->de_dev;
ndirent.de_devvp = pdep->de_devvp;
if ((error = createde(&ndirent, ndp, &dep)) == 0) {
ndp->ni_vp = DETOV(dep);
if ((ndp->ni_nameiop & SAVESTART) == 0)
free(ndp->ni_pnbuf, M_NAMEI);
} else {
free(ndp->ni_pnbuf, M_NAMEI);
}
deput(pdep); /* release parent dir */
return error;
}
int
pcfs_mknod(ndp, vap, cred, p)
struct nameidata *ndp;
struct vattr *vap;
struct ucred *cred;
struct proc *p;
{
int error;
switch (vap->va_type) {
case VDIR:
error = pcfs_mkdir(ndp, vap, p);
break;
/*
* pcfs_create() sets ndp->ni_vp.
*/
case VREG:
error = pcfs_create(ndp, vap, p);
break;
default:
error = EINVAL;
break;
}
return error;
}
int
pcfs_open(vp, mode, cred, p)
struct vnode *vp;
int mode;
struct ucred *cred;
struct proc *p;
{
return 0;
}
int
pcfs_close(vp, fflag, cred, p)
struct vnode *vp;
int fflag;
struct ucred *cred;
struct proc *p;
{
struct denode *dep = VTODE(vp);
if (vp->v_usecount > 1 && !(dep->de_flag & DELOCKED))
DETIMES(dep, &time);
return 0;
}
int
pcfs_access(vp, mode, cred, p)
struct vnode *vp;
int mode;
struct ucred *cred;
struct proc *p;
{
int dosmode;
struct denode *dep = VTODE(vp);
/*
* Root gets to do anything. Even execute a file
* without the x-bit on? But, for dos filesystems
* every file is executable. I may regret this.
*/
if (cred->cr_uid == 0)
return 0;
/*
* mode is filled with a combination of VREAD, VWRITE,
* and/or VEXEC bits turned on. In an octal number these
* are the Y in 0Y00.
*
* Since the dos filesystem doesn't have the concept of
* file ownership we just give everybody read and execute
* access and write access if the readonly bit is off.
*/
dosmode = VEXEC | VREAD |
((dep->de_Attributes & ATTR_READONLY) ? 0 : VWRITE);
return ((dosmode & mode) != 0) ? 0 : EACCES;
}
int
pcfs_getattr(vp, vap, cred, p)
struct vnode *vp;
struct vattr *vap;
struct ucred *cred;
struct proc *p;
{
u_int cn;
struct denode *dep = VTODE(vp);
DETIMES(dep, &time);
vap->va_fsid = dep->de_dev;
/* The following computation of the fileid must be the
* same as that used in pcfs_readdir() to compute d_fileno.
* If not, pwd doesn't work. */
if (dep->de_Attributes & ATTR_DIRECTORY) {
if ((cn = dep->de_StartCluster) == PCFSROOT)
cn = 1;
} else {
if ((cn = dep->de_dirclust) == PCFSROOT)
cn = 1;
cn = (cn << 16) | (dep->de_diroffset & 0xffff);
}
vap->va_fileid = cn;
vap->va_mode = (dep->de_Attributes & ATTR_READONLY) ? 0555 : 0777;
if (dep->de_Attributes & ATTR_DIRECTORY)
vap->va_mode |= S_IFDIR;
vap->va_nlink = 1;
vap->va_gid = 0;
vap->va_uid = 0;
vap->va_rdev = 0;
vap->va_size = dep->de_FileSize;
vap->va_size_rsv = 0;
dos2unixtime((union dosdate *)&dep->de_Date,
(union dostime *)&dep->de_Time, &vap->va_atime);
vap->va_atime.tv_usec = 0;
vap->va_mtime.tv_sec = vap->va_atime.tv_sec;
vap->va_mtime.tv_usec = 0;
vap->va_ctime.tv_sec = vap->va_atime.tv_sec;
vap->va_ctime.tv_usec = 0;
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_bytes_rsv = 0;
vap->va_type = vp->v_type;
return 0;
}
int
pcfs_setattr(vp, vap, cred, p)
struct vnode *vp;
struct vattr *vap;
struct ucred *cred;
struct proc *p;
{
int error = 0;
struct denode *dep = VTODE(vp);
#if defined(PCFSDEBUG)
printf("pcfs_setattr(): vp %08x, vap %08x, cred %08x, p %08x\n",
vp, vap, cred, p);
#endif /* defined(PCFSDEBUG) */
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 != (u_short)VNOVAL) ||
(vap->va_gid != (u_short)VNOVAL) ||
(vap->va_atime.tv_sec != VNOVAL)) {
#if defined(PCFSDEBUG)
printf("pcfs_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, va_atime.tv_sec %x\n",
vap->va_uid, vap->va_gid, vap->va_atime.tv_sec);
#endif /* defined(PCFSDEBUG) */
return EINVAL;
}
if (vap->va_size != VNOVAL) {
if (vp->v_type == VDIR)
return EISDIR;
if (error = detrunc(dep, vap->va_size, 0))
return error;
}
if (vap->va_mtime.tv_sec != VNOVAL) {
dep->de_flag |= DEUPD;
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 != (u_short)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 |= DEUPD;
}
if (vap->va_flags != VNOVAL) {
if (error = suser(cred, &p->p_acflag))
return error;
if (cred->cr_uid == 0)
dep->de_flag = vap->va_flags;
else {
dep->de_flag &= 0xffff0000;
dep->de_flag |= (vap->va_flags & 0xffff);
}
dep->de_flag |= DEUPD;
}
return error;
}
int
pcfs_read(vp, uio, ioflag, cred)
struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
int error = 0;
int diff;
int isadir;
long n;
long on;
daddr_t bn;
daddr_t lbn;
daddr_t rablock;
struct buf *bp;
struct denode *dep = VTODE(vp);
struct pcfsmount *pmp = dep->de_pmp;
/*
* 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_un.b_addr + 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
pcfs_write(vp, uio, ioflag, cred)
struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
int n;
int isadir;
int croffset;
int resid;
int osize;
int error;
u_long cluster;
u_long nextcluster;
u_long lastcluster;
daddr_t bn;
struct buf *bp;
struct proc *p = uio->uio_procp;
struct vnode *thisvp;
struct denode *dep = VTODE(vp);
struct pcfsmount *pmp = dep->de_pmp;
#if defined(PCFSDEBUG)
printf("pcfs_write(vp %08x, uio %08x, ioflag %08x, cred %08x\n",
vp, uio, ioflag, cred);
printf("pcfs_write(): diroff %d, dirclust %d, startcluster %d\n",
dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
#endif /* defined(PCFSDEBUG) */
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("pcfs_write(): non-sync directory update");
isadir = 1;
thisvp = pmp->pm_devvp;
break;
default:
panic("pcfs_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 == PCFSROOT &&
(uio->uio_offset+uio->uio_resid) > dep->de_FileSize)
return ENOSPC;
/*
* If the offset we are starting the write at is beyond the
* end of the file, then they've done a seek. Unix filesystems
* allow files with holes in them, DOS doesn't so we must
* fill the hole with zeroed blocks. We do this by calling
* our seek function. This could probably be cleaned up
* someday.
*/
if (uio->uio_offset > dep->de_FileSize) {
error = pcfs_seek(vp, (off_t)0, uio->uio_offset, cred);
if (error)
return error;
}
/*
* Remember some values in case the write fails.
*/
resid = uio->uio_resid;
osize = dep->de_FileSize;
do {
bn = uio->uio_offset >> pmp->pm_cnshift;
/*
* If we are appending to the file and we are on a
* cluster boundary, then allocate a new cluster
* and chain it onto the file.
*/
if (uio->uio_offset == dep->de_FileSize &&
(uio->uio_offset & pmp->pm_crbomask) == 0) {
if (error = extendfile(dep, &bp, 0))
break;
} else {
/*
* The block we need to write into exists,
* so just read it in.
*/
if (isadir) {
error = pcbmap(dep, bn, &bn, 0);
if (error)
return error;
}
error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp);
if (error)
return error;
}
croffset = uio->uio_offset & pmp->pm_crbomask;
n = MIN(uio->uio_resid, pmp->pm_bpcluster-croffset);
if (uio->uio_offset+n > dep->de_FileSize) {
dep->de_FileSize = uio->uio_offset + n;
vnode_pager_setsize(vp, dep->de_FileSize); /* why? */
}
(void) vnode_pager_uncache(vp); /* why not? */
/* Should these vnode_pager_* functions be done on dir files? */
/*
* Copy the data from user space into the buf header.
*/
error = uiomove(bp->b_un.b_addr+croffset, n, uio);
/*
* If they want this synchronous then write it and wait
* for it. Otherwise, if on a cluster boundary write it
* asynchronously so we can move on to the next block
* without delay. Otherwise do a delayed write because
* we may want to write somemore into the block later.
*/
if (ioflag & IO_SYNC)
(void) bwrite(bp);
else
if (n + croffset == pmp->pm_bpcluster) {
bp->b_flags |= B_AGE;
bawrite(bp);
} else
bdwrite(bp);
dep->de_flag |= DEUPD;
} while (error == 0 && uio->uio_resid > 0);
/*
* If the write failed and they want us to, truncate
* the file back to the size it was before the write
* was attempted.
*/
if (error && (ioflag & IO_UNIT)) {
detrunc(dep, osize, ioflag & IO_SYNC);
uio->uio_offset -= resid - uio->uio_resid;
uio->uio_resid = resid;
}
if (!error && (ioflag & IO_UNIT))
error = deupdat(dep, &time, 1);
return error;
}
int
pcfs_ioctl(vp, com, data, fflag, cred, p)
struct vnode *vp;
int com;
caddr_t data;
struct ucred *cred;
struct proc *p;
{
return ENOTTY;
}
int
pcfs_select(vp, which, fflags, cred, p)
struct vnode *vp;
int which;
int fflags;
struct ucred *cred;
struct proc *p;
{
return 1; /* DOS filesystems never block? */
}
int
pcfs_mmap(vp, fflags, cred, p)
struct vnode *vp;
int fflags;
struct ucred *cred;
struct proc *p;
{
return EINVAL;
}
/*
* Flush the blocks of a file to disk.
*
* This function is worthless for vnodes that represent
* directories.
* Maybe we could just do a sync if they try an fsync
* on a directory file.
*/
int
pcfs_fsync(vp, fflags, cred, waitfor, p)
struct vnode *vp;
int fflags;
struct ucred *cred;
int waitfor;
struct proc *p;
{
struct denode *dep = VTODE(vp);
if (fflags & FWRITE)
dep->de_flag |= DEUPD;
/*
* Does this call to vflushbuf() do anything? I can
* find no code anywhere that sets v_dirtyblkhd in the
* vnode, which vflushbuf() seems to depend upon.
*/
vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0);
return deupdat(dep, &time, waitfor == MNT_WAIT);
}
/*
* Since the dos filesystem does not allow files with
* holes in them we must fill the file with zeroed
* blocks when a seek past the end of file happens.
*
* It seems that nothing in the kernel calls the filesystem
* specific file seek functions. And, someone on the
* net told me that NFS never sends announcements of
* seeks to the server. So, if pcfs ever becomes
* NFS mountable it will have to use other means to
* fill in holes in what would be a sparse file.
*/
int
pcfs_seek(vp, oldoff, newoff, cred)
struct vnode *vp;
off_t oldoff;
off_t newoff;
struct ucred *cred;
{
int error = 0;
off_t foff;
daddr_t bn;
u_long cluster;
u_long lastcluster;
struct buf *bp;
struct denode *dep = VTODE(vp);
struct pcfsmount *pmp = dep->de_pmp;
#if defined(PCFSDEBUG)
printf("pcfs_seek(vp %08x, oldoff %d, newoff %d, cred %08x)\n",
vp, oldoff, newoff, cred);
#endif /* defined(PCFSDEBUG) */
/*
* Compute the offset of the first byte after the
* last block in the file.
* If seeking beyond the end of file then fill the
* file with zeroed blocks up to the seek address.
*/
foff = (dep->de_FileSize + (pmp->pm_bpcluster-1)) & ~pmp->pm_crbomask;
#if defined(PCFSDEBUG)
printf("seek: newoff %d > foff %d\n", newoff, foff);
#endif /* defined(PCFSDEBUG) */
if (newoff > foff) {
/*
* If this is the root directory and we are
* attempting to seek beyond the end disallow
* it. DOS filesystem root directories can
* not grow.
*/
if (vp->v_flag & VROOT)
return EINVAL;
/*
* If this is a directory and the caller is not
* root, then do not let them seek beyond the end
* of file. If we allowed this then users could
* cause directories to grow. Is this really that
* important?
*/
if (dep->de_Attributes & ATTR_DIRECTORY) {
if (error = suser(cred, NULL)) {
return error;
}
}
/*
* Allocate and chain together as many clusters as
* are needed to get to newoff.
*/
while (foff < newoff) {
if (error = extendfile(dep, &bp, 0))
return error;
dep->de_flag |= DEUPD;
bdwrite(bp);
foff += pmp->pm_bpcluster;
dep->de_FileSize += pmp->pm_bpcluster;
} /* end while() */
dep->de_FileSize = newoff;
return deupdat(dep, &time);
}
return 0;
}
int
pcfs_remove(ndp, p)
struct nameidata *ndp;
struct proc *p;
{
int error;
struct denode *dep = VTODE(ndp->ni_vp);
struct denode *ddep = VTODE(ndp->ni_dvp);
error = removede(ndp);
#if defined(PCFSDEBUG)
printf("pcfs_remove(), dep %08x, v_usecount %d\n", dep, ndp->ni_vp->v_usecount);
#endif /* defined(PCFSDEBUG) */
if (ddep == dep)
vrele(DETOV(dep));
else
deput(dep); /* causes pcfs_inactive() to be called via vrele() */
deput(ddep);
return error;
}
/*
* DOS filesystems don't know what links are.
*/
int
pcfs_link(vp, ndp, p)
struct vnode *vp;
struct nameidata *ndp;
struct proc *p;
{
return EINVAL;
}
/*
* Renames on files require moving the denode to
* a new hash queue since the denode's location is
* used to compute which hash queue to put the file in.
* Unless it is a rename in place. For example "mv a b".
*
* What follows is the basic algorithm:
*
* if (file move) {
* if (dest file exists) {
* remove dest file
* }
* if (dest and src in same directory) {
* rewrite name in existing directory slot
* } else {
* write new entry in dest directory
* update offset and dirclust in denode
* move denode to new hash chain
* clear old directory entry
* }
* } else { directory move
* if (dest directory exists) {
* if (dest is not empty) {
* return ENOTEMPTY
* }
* remove dest directory
* }
* if (dest and src in same directory) {
* rewrite name in existing entry
* } else {
* be sure dest is not a child of src directory
* write entry in dest directory
* update "." and ".." in moved directory
* update offset and dirclust in denode
* move denode to new hash chain
* clear old directory entry for moved directory
* }
* }
*
* On entry:
* source's parent directory is unlocked
* source file or directory is unlocked
* destination's parent directory is locked
* destination file or directory is locked if it exists
*
* On exit:
* all denodes should be released
* Notes:
* I'm not sure how the memory containing the pathnames
* pointed at by the nameidata structures is freed, there
* may be some memory bleeding for each rename done.
*/
int
pcfs_rename(fndp, tndp, p)
struct nameidata *fndp;
struct nameidata *tndp;
struct proc *p;
{
u_char toname[11];
int error;
int newparent = 0;
int sourceisadirectory = 0;
u_long to_dirclust;
u_long to_diroffset;
u_long cn;
daddr_t bn;
struct denode *fddep; /* from file's parent directory */
struct denode *fdep; /* from file or directory */
struct denode *tddep; /* to file's parent directory */
struct denode *tdep; /* to file or directory */
struct pcfsmount *pmp;
struct direntry *dotdotp;
struct direntry *ep;
struct buf *bp;
#if defined(PCFSDEBUG)
printf("pcfs_rename(fndp %08x, tndp %08x, p %08x\n", fndp, tndp, p);
#endif /* defined(PCFSDEBUG) */
fddep = VTODE(fndp->ni_dvp);
fdep = VTODE(fndp->ni_vp);
tddep = VTODE(tndp->ni_dvp);
tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL;
pmp = fddep->de_pmp;
/*
* Convert the filename in tdnp into a dos filename.
* We copy this into the denode and directory entry
* for the destination file/directory.
*/
unix2dosfn((u_char *)tndp->ni_ptr, toname, tndp->ni_namelen);
/*
* At this point this is the lock state of the denodes:
* fddep referenced
* fdep referenced
* tddep locked
* tdep locked if it exists
*/
/*
* Be sure we are not renaming ".", "..", or an alias of ".".
* This leads to a crippled directory tree. It's pretty tough
* to do a "ls" or "pwd" with the "." directory entry missing,
* and "cd .." doesn't work if the ".." entry is missing.
*/
if (fdep->de_Attributes & ATTR_DIRECTORY) {
if ((fndp->ni_namelen == 1 && fndp->ni_ptr[0] == '.') ||
fddep == fdep || /* won't happen ? */
fndp->ni_isdotdot) {
VOP_ABORTOP(tndp);
vput(tndp->ni_dvp);
if (tndp->ni_vp)
vput(tndp->ni_vp);
VOP_ABORTOP(fndp);
vrele(fndp->ni_dvp);
vrele(fndp->ni_vp);
return EINVAL;
}
sourceisadirectory = 1;
}
/*
* If we are renaming a directory, and the directory
* is being moved to another directory, then we must
* be sure the destination directory is not in the
* subtree of the source directory. This could orphan
* everything under the source directory.
* doscheckpath() unlocks the destination's parent
* directory so we must look it up again to relock it.
*/
if (fddep->de_StartCluster != tddep->de_StartCluster)
newparent = 1;
if (sourceisadirectory && newparent) {
if (tdep) {
deput(tdep);
tdep = NULL;
}
/* doscheckpath() deput()'s tddep */
error = doscheckpath(fdep, tddep, tndp->ni_cred);
tddep = NULL;
if (error) {
goto bad;
}
if ((tndp->ni_nameiop & SAVESTART) == 0)
panic("pcfs_rename(): lost to startdir");
if (error = lookup(tndp, p)) {
goto bad;
}
tddep = VTODE(tndp->ni_dvp);
tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL;
}
/*
* If the destination exists, then be sure its type (file or dir)
* matches that of the source. And, if it is a directory make
* sure it is empty. Then delete the destination.
*/
if (tdep) {
if (tdep->de_Attributes & ATTR_DIRECTORY) {
if (!sourceisadirectory) {
error = ENOTDIR;
goto bad;
}
if (!dosdirempty(tdep)) {
error = ENOTEMPTY;
goto bad;
}
} else { /* destination is file */
if (sourceisadirectory) {
error = EISDIR;
goto bad;
}
}
to_dirclust = tdep->de_dirclust;
to_diroffset = tdep->de_diroffset;
if (error = removede(tndp)) {
goto bad;
}
deput(tdep);
tdep = NULL;
/*
* Remember where the slot was for createde().
*/
tndp->ni_pcfs.pcfs_count = 1;
tndp->ni_pcfs.pcfs_cluster = to_dirclust;
tndp->ni_pcfs.pcfs_offset = to_diroffset;
}
/*
* If the source and destination are in the same
* directory then just read in the directory entry,
* change the name in the directory entry and
* write it back to disk.
*/
if (newparent == 0) {
/* tddep and fddep point to the same denode here */
DELOCK(fdep); /* tddep is already locked */
if (error = readde(fdep, &bp, &ep)) {
DEUNLOCK(fdep);
goto bad;
}
bcopy(toname, ep->deName, 11);
if (error = bwrite(bp)) {
DEUNLOCK(fdep);
goto bad;
}
bcopy(toname, fdep->de_Name, 11); /* update denode */
/*
* fdep locked
* fddep and tddep point to the same denode which is locked
* tdep is unlocked and unreferenced
*/
} else {
u_long dirsize;
/*
* If the source and destination are in different
* directories, then mark the entry in the source
* directory as deleted and write a new entry in the
* destination directory. Then move the denode to
* the correct hash chain for its new location in
* the filesystem. And, if we moved a directory,
* then update its .. entry to point to the new
* parent directory.
* If we moved a directory will also insure that
* the directory entry on disk has a filesize of
* zero.
*/
DELOCK(fdep);
bcopy(toname, fdep->de_Name, 11); /* update denode */
if (fdep->de_Attributes & ATTR_DIRECTORY) {
dirsize = fdep->de_FileSize;
fdep->de_FileSize = 0;
}
error = createde(fdep, tndp, (struct denode **)0);
if (fdep->de_Attributes & ATTR_DIRECTORY) {
fdep->de_FileSize = dirsize;
}
if (error) {
/* should put back filename */
DEUNLOCK(fdep);
goto bad;
}
DELOCK(fddep);
if (error = readde(fdep, &bp, &ep)) { /* read source de */
DEUNLOCK(fdep);
DEUNLOCK(fddep);
goto bad;
}
ep->deName[0] = SLOT_DELETED;
if (error = bwrite(bp)) {
DEUNLOCK(fdep);
DEUNLOCK(fddep);
goto bad;
}
fdep->de_dirclust = tndp->ni_pcfs.pcfs_cluster;
fdep->de_diroffset = tndp->ni_pcfs.pcfs_offset;
reinsert(fdep);
DEUNLOCK(fddep);
}
/* fdep is still locked here */
/*
* If we moved a directory to a new parent directory,
* then we must fixup the ".." entry in the moved
* directory.
*/
if (sourceisadirectory && newparent) {
cn = fdep->de_StartCluster;
if (cn == PCFSROOT) {
/* this should never happen */
panic("pcfs_rename(): updating .. in root directory?\n");
} else {
bn = cntobn(pmp, cn);
}
error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
NOCRED, &bp);
if (error) {
/* should really panic here, fs is corrupt */
DEUNLOCK(fdep);
goto bad;
}
dotdotp = (struct direntry *)bp->b_un.b_addr + 1;
dotdotp->deStartCluster = tddep->de_StartCluster;
error = bwrite(bp);
DEUNLOCK(fdep);
if (error) {
/* should really panic here, fs is corrupt */
goto bad;
}
} else {
DEUNLOCK(fdep);
}
bad:;
vrele(DETOV(fdep));
vrele(DETOV(fddep));
if (tdep)
vput(DETOV(tdep));
if (tddep)
vput(DETOV(tddep));
return error;
}
struct {
struct direntry dot;
struct direntry dotdot;
} dosdirtemplate = {
". ", " ", /* the . entry */
ATTR_DIRECTORY, /* file attribute */
0,0,0,0,0,0,0,0,0,0, /* resevered */
1234, 1234, /* time and date */
0, /* startcluster */
0, /* filesize */
".. ", " ", /* the .. entry */
ATTR_DIRECTORY, /* file attribute */
0,0,0,0,0,0,0,0,0,0, /* resevered */
1234, 1234, /* time and date */
0, /* startcluster */
0, /* filesize */
};
int
pcfs_mkdir(ndp, vap, p)
struct nameidata *ndp;
struct vattr *vap;
struct proc *p;
{
int bn;
int error;
u_long newcluster;
struct denode *pdep;
struct denode *ndep;
struct vnode *pvp;
struct direntry *denp;
struct denode ndirent;
struct pcfsmount *pmp;
struct buf *bp;
pvp = ndp->ni_dvp;
pdep = VTODE(pvp);
/*
* If this is the root directory and there is no space left
* we can't do anything. This is because the root directory
* can not change size.
*/
if (pdep->de_StartCluster == PCFSROOT && ndp->ni_pcfs.pcfs_count == 0) {
free(ndp->ni_pnbuf, M_NAMEI);
deput(pdep);
return ENOSPC;
}
pmp = pdep->de_pmp;
/*
* Allocate a cluster to hold the about to be created directory.
*/
if (error = clusteralloc(pmp, &newcluster, CLUST_EOFE)) {
free(ndp->ni_pnbuf, M_NAMEI);
deput(pdep);
return error;
}
/*
* Now fill the cluster with the "." and ".." entries.
* And write the cluster to disk. This way it is there
* for the parent directory to be pointing at if there
* were a crash.
*/
bn = cntobn(pmp, newcluster);
bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster); /* always succeeds */
bzero(bp->b_un.b_addr, pmp->pm_bpcluster);
bcopy(&dosdirtemplate, bp->b_un.b_addr, sizeof dosdirtemplate);
denp = (struct direntry *)bp->b_un.b_addr;
denp->deStartCluster = newcluster;
unix2dostime(&time, (union dosdate *)&denp->deDate,
(union dostime *)&denp->deTime);
denp++;
denp->deStartCluster = pdep->de_StartCluster;
unix2dostime(&time, (union dosdate *)&denp->deDate,
(union dostime *)&denp->deTime);
if (error = bwrite(bp)) {
clusterfree(pmp, newcluster, NULL);
free(ndp->ni_pnbuf, M_NAMEI);
deput(pdep);
return error;
}
/*
* Now build up a directory entry pointing to the newly
* allocated cluster. This will be written to an empty
* slot in the parent directory.
*/
ndep = &ndirent;
bzero(ndep, sizeof(*ndep));
unix2dosfn((u_char *)ndp->ni_ptr, ndep->de_Name, ndp->ni_namelen);
unix2dostime(&time, (union dosdate *)&ndep->de_Date,
(union dostime *)&ndep->de_Time);
ndep->de_StartCluster = newcluster;
ndep->de_Attributes = ATTR_DIRECTORY;
ndep->de_pmp = pmp; /* createde() needs this */
error = createde(ndep, ndp, &ndep);
if (error) {
clusterfree(pmp, newcluster, NULL);
} else {
ndp->ni_vp = DETOV(ndep);
}
free(ndp->ni_pnbuf, M_NAMEI);
#if defined(PCFSDEBUG)
printf("pcfs_mkdir(): deput(%08x), vnode %08x\n", pdep, DETOV(pdep));
#endif /* defined(PCFSDEBUG) */
deput(pdep);
return error;
}
int
pcfs_rmdir(ndp, p)
struct nameidata *ndp;
struct proc *p;
{
struct denode *ddep;
struct denode *dep;
int error = 0;
ddep = VTODE(ndp->ni_dvp); /* parent dir of dir to delete */
dep = VTODE(ndp->ni_vp); /* directory to delete */
/*
* Don't let "rmdir ." go thru.
*/
if (ddep == dep) {
vrele(DETOV(dep));
deput(dep);
return EINVAL;
}
/*
* Be sure the directory being deleted is empty.
*/
if (dosdirempty(dep) == 0) {
error = ENOTEMPTY;
goto out;
}
/*
* Delete the entry from the directory. For dos filesystems
* this gets rid of the directory entry on disk, the in memory
* copy still exists but the de_refcnt is <= 0. This prevents
* it from being found by deget(). When the deput() on dep is
* done we give up access and eventually pcfs_reclaim() will
* be called which will remove it from the denode cache.
*/
if (error = removede(ndp))
goto out;
/*
* This is where we decrement the link count in the parent
* directory. Since dos filesystems don't do this we just
* purge the name cache and let go of the parent directory
* denode.
*/
cache_purge(DETOV(ddep));
deput(ddep);
ndp->ni_dvp = NULL; /* getting rid of parent dir pointer? */
/*
* Truncate the directory that is being deleted.
*/
error = detrunc(dep, (u_long)0, IO_SYNC);
cache_purge(DETOV(dep));
out:;
if (ndp->ni_dvp)
deput(ddep);
deput(dep);
return error;
}
/*
* DOS filesystems don't know what symlinks are.
*/
int
pcfs_symlink(ndp, vap, target, p)
struct nameidata *ndp;
struct vattr *vap;
char *target;
struct proc *p;
{
return EINVAL;
}
/*
* Dummy dirents to simulate the "." and ".." entries
* of the root directory in a dos filesystem. Dos doesn't
* provide these.
* Note that each entry must be the same size as a dos
* directory entry (32 bytes).
*/
struct dos_dirent {
u_long d_fileno;
u_short d_reclen;
u_short d_namlen;
u_char d_name[24];
} rootdots[2] = {
{
1, /* d_fileno */
sizeof(struct direntry), /* d_reclen */
1, /* d_namlen */
"." /* d_name */
},
{
1, /* d_fileno */
sizeof(struct direntry), /* d_reclen */
2, /* d_namlen */
".." /* d_name */
}
};
int
pcfs_readdir(vp, uio, cred, eofflagp)
struct vnode *vp;
struct uio *uio;
struct ucred *cred;
int *eofflagp;
{
int error = 0;
int diff;
char pushout;
long n;
long on;
long lost;
long count;
u_long cn;
u_long fileno;
long bias = 0;
daddr_t bn;
daddr_t lbn;
struct buf *bp;
struct denode *dep = VTODE(vp);
struct pcfsmount *pmp = dep->de_pmp;
struct direntry *dentp;
struct dirent *prev;
struct dirent *crnt;
u_char dirbuf[512]; /* holds converted dos directories */
int i=0;
#if defined(PCFSDEBUG)
printf("pcfs_readdir(): vp %08x, uio %08x, cred %08x, eofflagp %08x\n",
vp, uio, cred, eofflagp);
#endif /* defined(PCFSDEBUG) */
/*
* pcfs_readdir() won't operate properly on regular files
* since it does i/o only with the the filesystem vnode,
* and hence can retrieve the wrong block from the buffer
* cache for a plain file. So, fail attempts to readdir()
* on a plain file.
*/
if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
return ENOTDIR;
/*
* If the user buffer is smaller than the size of one dos
* directory entry or the file offset is not a multiple of
* the size of a directory entry, then we fail the read.
*/
count = uio->uio_resid & ~(sizeof(struct direntry)-1);
lost = uio->uio_resid - count;
if (count < sizeof(struct direntry) ||
(uio->uio_offset & (sizeof(struct direntry)-1)))
return EINVAL;
uio->uio_resid = count;
uio->uio_iov->iov_len = count;
/*
* If they are reading from the root directory then,
* we simulate the . and .. entries since these don't
* exist in the root directory. We also set the offset
* bias to make up for having to simulate these entries.
* By this I mean that at file offset 64 we read the first entry
* in the root directory that lives on disk.
*/
if (dep->de_StartCluster == PCFSROOT) {
/*printf("pcfs_readdir(): going after . or .. in root dir, offset %d\n",
uio->uio_offset);*/
bias = 2*sizeof(struct direntry);
if (uio->uio_offset < 2*sizeof(struct direntry)) {
error = uiomove((char *)rootdots + uio->uio_offset,
sizeof rootdots - uio->uio_offset, uio);
if (error)
goto out;
}
}
do {
lbn = (uio->uio_offset-bias) >> pmp->pm_cnshift;
on = (uio->uio_offset-bias) & pmp->pm_crbomask;
n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid);
diff = dep->de_FileSize - (uio->uio_offset - bias);
if (diff <= 0)
return 0;
if (diff < n)
n = diff;
error = pcbmap(dep, lbn, &bn, &cn);
if (error)
break;
error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, NOCRED, &bp);
n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
if (error) {
brelse(bp);
return error;
}
/*
* code to convert from dos directory entries to ufs directory entries
*/
pushout = 0;
dentp = (struct direntry *)(bp->b_un.b_addr + on);
prev = 0;
crnt = (struct dirent *)dirbuf;
while ((char *)dentp < bp->b_un.b_addr + on + n) {
/*printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);*/
/*
* If we have an empty entry or a slot from a deleted
* file, or a volume label entry just concatenate its
* space onto the end of the previous entry or,
* manufacture an empty entry if there is no previous
* entry.
*/
if (dentp->deName[0] == SLOT_EMPTY ||
dentp->deName[0] == SLOT_DELETED ||
(dentp->deAttributes & ATTR_VOLUME)) {
if (prev) {
prev->d_reclen += sizeof(struct direntry);
} else {
prev = crnt;
prev->d_fileno = 0;
prev->d_reclen = sizeof(struct direntry);
prev->d_namlen = 0;
prev->d_name[0] = 0;
}
} else {
/* this computation of d_fileno must match
* the computation of va_fileid in pcfs_getattr */
if (dentp->deAttributes & ATTR_DIRECTORY) {
/* if this is the root directory */
if ((fileno = dentp->deStartCluster) == PCFSROOT)
fileno = 1;
} else {
/* if the file's dirent lives in root dir */
if ((fileno = cn) == PCFSROOT)
fileno = 1;
fileno = (fileno << 16) |
((dentp - (struct direntry *)bp->b_un.b_addr) & 0xffff);
}
crnt->d_fileno = fileno;
crnt->d_reclen = sizeof(struct direntry);
crnt->d_namlen = dos2unixfn(dentp->deName,
(u_char *)crnt->d_name);
/*printf("readdir: file %s, fileno %08x, attr %02x, start %08x\n",
crnt->d_name, crnt->d_fileno, dentp->deAttributes, dentp->deStartCluster);*/
prev = crnt;
}
crnt = (struct dirent *)((char *)crnt + sizeof(struct direntry));
pushout = 1;
/*
* If our intermediate buffer is full then copy
* its contents to user space. I would just
* use the buffer the buf header points to but,
* I'm afraid that when we brelse() it someone else
* might find it in the cache and think its contents
* are valid. Maybe there is a way to invalidate
* the buffer before brelse()'ing it.
*/
if ((u_char *)crnt >= &dirbuf[sizeof dirbuf]) {
pushout = 0;
error = uiomove(dirbuf, sizeof(dirbuf), uio);
if (error)
break;
prev = 0;
crnt = (struct dirent *)dirbuf;
}
dentp++;
}
if (pushout) {
pushout = 0;
error = uiomove(dirbuf, (char *)crnt - (char *)dirbuf,
uio);
}
/*
* If we have read everything from this block or
* have read to end of file then we are done with
* this block. Mark it to say the buffer can be reused if
* need be.
*/
#if 0
if (n + on == pmp->pm_bpcluster ||
(uio->uio_offset-bias) == dep->de_FileSize)
bp->b_flags |= B_AGE;
#endif
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
out:;
uio->uio_resid += lost;
/*
* I don't know why we bother setting this eofflag, getdirentries()
* in vfs_syscalls.c doesn't bother to look at it when we return.
*/
if (dep->de_FileSize - uio->uio_offset - bias <= 0)
*eofflagp = 1;
else
*eofflagp = 0;
return error;
}
/*
* DOS filesystems don't know what symlinks are.
*/
int
pcfs_readlink(vp, uio, cred)
struct vnode *vp;
struct uio *uio;
struct ucred *cred;
{
return EINVAL;
}
int
pcfs_abortop(ndp)
struct nameidata *ndp;
{
if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF)
FREE(ndp->ni_pnbuf, M_NAMEI);
return 0;
}
int
pcfs_lock(vp)
struct vnode *vp;
{
struct denode *dep = VTODE(vp);
DELOCK(dep);
return 0;
}
int
pcfs_unlock(vp)
struct vnode *vp;
{
struct denode *dep = VTODE(vp);
if (!(dep->de_flag & DELOCKED))
panic("pcfs_unlock: denode not locked");
DEUNLOCK(dep);
return 0;
}
int
pcfs_islocked(vp)
struct vnode *vp;
{
return VTODE(vp)->de_flag & DELOCKED ? 1 : 0;
}
/*
* vp - address of vnode file the file
* bn - which cluster we are interested in mapping to
* a filesystem block number.
* vpp - returns the vnode for the block special file
* holding the filesystem containing the file of interest
* bnp - address of where to return the filesystem
* relative block number
*/
int
pcfs_bmap(vp, bn, vpp, bnp)
struct vnode *vp;
daddr_t bn;
struct vnode **vpp;
daddr_t *bnp;
{
struct denode *dep = VTODE(vp);
struct pcfsmount *pmp = dep->de_pmp;
if (vpp != NULL)
*vpp = dep->de_devvp;
if (bnp == NULL)
return 0;
return pcbmap(dep, bn << (pmp->pm_cnshift - pmp->pm_bnshift), bnp, 0);
}
int
pcfs_strategy(bp)
struct buf *bp;
{
struct denode *dep = VTODE(bp->b_vp);
struct pcfsmount *pmp = dep->de_pmp;
struct vnode *vp;
int error;
if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
panic("pcfs_strategy: spec");
/*
* If we don't already know the filesystem relative
* block number then get it using pcbmap(). If pcbmap()
* returns the block number as -1 then we've got a hole
* in the file. DOS filesystems don't allow files with
* holes, so we shouldn't ever see this.
*/
if (bp->b_blkno == bp->b_lblkno) {
if (error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0))
return error;
if ((long)bp->b_blkno == -1)
clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
biodone(bp);
return 0;
}
#ifdef DIAGNOSTIC
#endif /* defined(DIAGNOSTIC) */
/*
* Read/write the block from/to the disk that contains the desired
* file block.
*/
vp = dep->de_devvp;
bp->b_dev = vp->v_rdev;
(*(vp->v_op->vop_strategy))(bp);
return 0;
}
int
pcfs_print(vp)
struct vnode *vp;
{
struct denode *dep = VTODE(vp);
printf("tag VT_PCFS, startcluster %d, dircluster %d, diroffset %d ",
dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
printf(" dev %d, %d, %s\n",
major(dep->de_dev), minor(dep->de_dev),
dep->de_flag & DELOCKED ? "(LOCKED)" : "");
if (dep->de_spare0) {
printf(" owner pid %d", dep->de_spare0);
if (dep->de_spare1)
printf(" waiting pid %d", dep->de_spare1);
printf("\n");
}
}
int
pcfs_advlock(vp, id, op, fl, flags)
struct vnode *vp;
caddr_t id;
int op;
struct flock *fl;
int flags;
{
return EINVAL; /* we don't do locking yet */
}
struct vnodeops pcfs_vnodeops = {
pcfs_lookup,
pcfs_create,
pcfs_mknod,
pcfs_open,
pcfs_close,
pcfs_access,
pcfs_getattr,
pcfs_setattr,
pcfs_read,
pcfs_write,
pcfs_ioctl,
pcfs_select,
pcfs_mmap,
pcfs_fsync,
pcfs_seek,
pcfs_remove,
pcfs_link,
pcfs_rename,
pcfs_mkdir,
pcfs_rmdir,
pcfs_symlink,
pcfs_readdir,
pcfs_readlink,
pcfs_abortop,
pcfs_inactive,
pcfs_reclaim,
pcfs_lock,
pcfs_unlock,
pcfs_bmap,
pcfs_strategy,
pcfs_print,
pcfs_islocked,
pcfs_advlock,
};
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.