/* $NetBSD: msdosfs_vnops.c,v 1.23 1994/09/28 15:00:31 mycroft 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 #include #include #include /* defines plimit structure in proc struct */ #include #include /* define FWRITE ... */ #include #include #include #include #include #include /* XXX */ /* defines v_rdev */ #include #include /* defines dirent structure */ #include #include #include #include #include /* * 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; int 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; int *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 };