/* $Id: msdosfs_vnops.c,v 1.42 1997/05/17 18:32:40 phk Exp $ */ /* $NetBSD: msdosfs_vnops.c,v 1.20 1994/08/21 18:44:13 ws 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 #include #include #include #include #include #include /* XXX */ /* defines v_rdev */ #include #include #include #include #include #include #include #include #include #include /* * Prototypes for MSDOSFS vnode operations */ static int msdosfs_create __P((struct vop_create_args *)); static int msdosfs_mknod __P((struct vop_mknod_args *)); static int msdosfs_open __P((struct vop_open_args *)); static int msdosfs_close __P((struct vop_close_args *)); static int msdosfs_access __P((struct vop_access_args *)); static int msdosfs_getattr __P((struct vop_getattr_args *)); static int msdosfs_setattr __P((struct vop_setattr_args *)); static int msdosfs_read __P((struct vop_read_args *)); static int msdosfs_write __P((struct vop_write_args *)); static int msdosfs_ioctl __P((struct vop_ioctl_args *)); static int msdosfs_select __P((struct vop_select_args *)); static int msdosfs_mmap __P((struct vop_mmap_args *)); static int msdosfs_fsync __P((struct vop_fsync_args *)); static int msdosfs_seek __P((struct vop_seek_args *)); static int msdosfs_remove __P((struct vop_remove_args *)); static int msdosfs_link __P((struct vop_link_args *)); static int msdosfs_rename __P((struct vop_rename_args *)); static int msdosfs_mkdir __P((struct vop_mkdir_args *)); static int msdosfs_rmdir __P((struct vop_rmdir_args *)); static int msdosfs_symlink __P((struct vop_symlink_args *)); static int msdosfs_readdir __P((struct vop_readdir_args *)); static int msdosfs_readlink __P((struct vop_readlink_args *)); static int msdosfs_abortop __P((struct vop_abortop_args *)); static int msdosfs_lock __P((struct vop_lock_args *)); static int msdosfs_unlock __P((struct vop_unlock_args *)); static int msdosfs_bmap __P((struct vop_bmap_args *)); static int msdosfs_strategy __P((struct vop_strategy_args *)); static int msdosfs_print __P((struct vop_print_args *)); static int msdosfs_islocked __P((struct vop_islocked_args *)); static int msdosfs_advlock __P((struct vop_advlock_args *)); static int msdosfs_pathconf __P((struct vop_pathconf_args *ap)); static int msdosfs_reallocblks __P((struct vop_reallocblks_args *)); /* * 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. */ static 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 /* * 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 & SAVENAME) == 0) panic("msdosfs_create: no name"); #endif bzero(&ndirent, sizeof(ndirent)); TIMEVAL_TO_TIMESPEC(&time, &ts); unix2dostime(&ts, &ndirent.de_Date, &ndirent.de_Time); unix2dosfn((u_char *)cnp->cn_nameptr, ndirent.de_Name, cnp->cn_namelen); ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? ATTR_ARCHIVE : ATTR_ARCHIVE | 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)) == 0) { *ap->a_vpp = DETOV(dep); if ((cnp->cn_flags & SAVESTART) == 0) free(cnp->cn_pnbuf, M_NAMEI); } else { free(cnp->cn_pnbuf, M_NAMEI); } vput(ap->a_dvp); /* release parent dir */ return error; } static 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: error = msdosfs_mkdir((struct vop_mkdir_args *)ap); break; case VREG: error = msdosfs_create((struct vop_create_args *)ap); break; default: error = EINVAL; free(ap->a_cnp->cn_pnbuf, M_NAMEI); vput(ap->a_dvp); break; } return error; } static 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; } static 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); simple_lock(&vp->v_interlock); if (vp->v_usecount > 1) DE_TIMES(dep, &time); simple_unlock(&vp->v_interlock); return 0; } static 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 vnode *vp = ap->a_vp; struct denode *dep = VTODE(ap->a_vp); struct msdosfsmount *pmp = dep->de_pmp; struct ucred *cred = ap->a_cred; mode_t mask, file_mode, mode = ap->a_mode; register gid_t *gp; int i; file_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)); file_mode &= pmp->pm_mask; /* * Disallow write attempts on read-only file systems; * unless the file is a socket, fifo, or a block or * character device resident on the file system. */ if (mode & VWRITE) { switch (vp->v_type) { case VDIR: case VLNK: case VREG: if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); break; } } /* 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 (file_mode & 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 (file_mode & 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 (file_mode & mask) == mask ? 0 : EACCES; } static 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; DE_TIMES(dep, &time); 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; #if 0 #ifndef MSDOSFS_NODIRMOD if (vap->va_mode & S_IFDIR) TIMEVAL_TO_TIMESPEC(&time, &vap->va_mtime); #endif #endif vap->va_ctime = vap->va_atime; vap->va_flags = (dep->de_Attributes & ATTR_ARCHIVE) ? 0 : SF_ARCHIVED; 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; vap->va_filerev = dep->de_modrev; return 0; } static 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; { struct vnode *vp = ap->a_vp; struct denode *dep = VTODE(ap->a_vp); struct vattr *vap = ap->a_vap; struct ucred *cred = ap->a_cred; int error = 0; /* * Check for unsettable attributes. */ 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)) { return (EINVAL); } if (vap->va_flags != VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); if (cred->cr_uid != dep->de_pmp->pm_uid && (error = suser(cred, &ap->a_p->p_acflag))) return (error); /* * We are very inconsistent about handling unsupported * attributes. We ignored the the access time and the * read and execute bits. We were strict for the other * attributes. * * Here we are strict, stricter than ufs in not allowing * users to attempt to set SF_SETTABLE bits or anyone to * set unsupported bits. However, we ignore attempts to * set ATTR_ARCHIVE for directories `cp -pr' from a more * sensible file system attempts it a lot. */ if (cred->cr_uid != 0) { if (vap->va_flags & SF_SETTABLE) return EPERM; } if (vap->va_flags & ~SF_ARCHIVED) return EINVAL; if (vap->va_flags & SF_ARCHIVED) dep->de_Attributes &= ~ATTR_ARCHIVE; else if (!(dep->de_Attributes & ATTR_DIRECTORY)) dep->de_Attributes |= ATTR_ARCHIVE; dep->de_flag |= DE_MODIFIED; } if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (uid_t)VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); if ((cred->cr_uid != dep->de_pmp->pm_uid || vap->va_uid != dep->de_pmp->pm_uid || (vap->va_gid != dep->de_pmp->pm_gid && !groupmember(vap->va_gid, cred))) && (error = suser(cred, &ap->a_p->p_acflag))) return error; if (vap->va_uid != dep->de_pmp->pm_uid || vap->va_gid != dep->de_pmp->pm_gid) return EINVAL; } if (vap->va_size != VNOVAL) { /* * Disallow write attempts on read-only file systems; * unless the file is a socket, fifo, or a block or * character device resident on the file system. */ switch (vp->v_type) { case VDIR: return (EISDIR); case VLNK: case VREG: if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); break; } error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); if (error) return error; } if (vap->va_mtime.tv_sec != VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); if (cred->cr_uid != dep->de_pmp->pm_uid && (error = suser(cred, &ap->a_p->p_acflag)) && ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || (error = VOP_ACCESS(vp, VWRITE, cred, ap->a_p)))) return error; dep->de_flag |= DE_UPDATE; error = deupdat(dep, &vap->va_mtime, 1); if (error) return error; } /* * DOS files only have the ability to have their writability * attribute set, so we use the owner write bit to set the readonly * attribute. */ error = 0; if (vap->va_mode != (u_short) VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); if (cred->cr_uid != dep->de_pmp->pm_uid && (error = suser(cred, &ap->a_p->p_acflag))) return error; /* We ignore the read and execute bits */ if (vap->va_mode & VWRITE) dep->de_Attributes &= ~ATTR_READONLY; else dep->de_Attributes |= ATTR_READONLY; dep->de_flag |= DE_MODIFIED; } return error; } static 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; int rasize; 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; #ifdef PC98 /* * 1024byte/sector support */ if (pmp->pm_BytesPerSec == 1024) vp->v_flag |= 0x10000; #endif if (vp->v_lastr + 1 == lbn && rablock * pmp->pm_bpcluster < dep->de_FileSize) { rasize = pmp->pm_bpcluster; error = breadn(vp, lbn, pmp->pm_bpcluster, &rablock, &rasize, 1, 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. */ static 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; int osize; int error = 0; 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) { error = deextend(dep, uio->uio_offset, cred); if (error) return error; } /* * Remember some values in case the write fails. */ resid = uio->uio_resid; osize = dep->de_FileSize; #ifdef PC98 /* * 1024byte/sector support */ if (pmp->pm_BytesPerSec == 1024) thisvp->v_flag |= 0x10000; #endif /* * 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) { error = pcbmap(dep, bn, &bn, 0); if (error) break; } else if (bn > lastcn) { error = ENOSPC; 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; /* The object size needs to be set before buffer is allocated */ vnode_pager_setsize(vp, dep->de_FileSize); } 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) { error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0); if (error) bp->b_blkno = -1; } if (bp->b_blkno == -1) { brelse(bp); if (!error) error = EIO; /* XXX */ break; } } } else { /* * The block we need to write into exists, so read it in. */ error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); if (error) break; } /* * Should these vnode_pager_* functions be done on dir * files? */ /* * Copy the data from user space into the buf header. */ error = uiomove(bp->b_data + croffset, n, uio); /* * If they want this synchronous then write it and wait for * it. Otherwise, if on a cluster boundary write it * asynchronously so we can move on to the next block * without delay. Otherwise do a delayed write because we * may want to write somemore into the block later. */ if (ioflag & IO_SYNC) (void) bwrite(bp); else if (n + croffset == pmp->pm_bpcluster) { bawrite(bp); } else bdwrite(bp); dep->de_flag |= DE_UPDATE; } while (error == 0 && uio->uio_resid > 0); /* * If the write failed and they want us to, truncate the file back * to the size it was before the write was attempted. */ errexit: if (error) { if (ioflag & IO_UNIT) { detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); uio->uio_offset -= resid - uio->uio_resid; uio->uio_resid = resid; } else { detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); if (uio->uio_resid != resid) error = 0; } } else if (ioflag & IO_SYNC) { TIMEVAL_TO_TIMESPEC(&time, &ts); error = deupdat(dep, &ts, 1); } return error; } static 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; } static 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? */ } static 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. */ static int msdosfs_fsync(ap) struct vop_fsync_args /* { struct vnode *a_vp; struct ucred *a_cred; int a_waitfor; struct proc *a_p; } */ *ap; { register struct vnode *vp = ap->a_vp; register struct buf *bp; int wait = ap->a_waitfor == MNT_WAIT; struct timespec ts; struct buf *nbp; int s; /* * Flush all dirty buffers associated with a vnode. */ loop: s = splbio(); for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) { nbp = bp->b_vnbufs.le_next; if ((bp->b_flags & B_BUSY)) continue; if ((bp->b_flags & B_DELWRI) == 0) panic("msdosfs_fsync: not dirty"); bremfree(bp); bp->b_flags |= B_BUSY; splx(s); (void) bwrite(bp); goto loop; } while (vp->v_numoutput) { vp->v_flag |= VBWAIT; (void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "msdosfsn", 0); } #ifdef DIAGNOSTIC if (vp->v_dirtyblkhd.lh_first) { vprint("msdosfs_fsync: dirty", vp); goto loop; } #endif splx(s); TIMEVAL_TO_TIMESPEC(&time, &ts); return deupdat(VTODE(vp), &ts, wait); } /* * Now the whole work of extending a file is done in the write function. * So nothing to do here. */ static 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; } static int msdosfs_remove(ap) struct vop_remove_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap; { int error; struct denode *dep = VTODE(ap->a_vp); struct denode *ddep = VTODE(ap->a_dvp); 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. */ static int msdosfs_link(ap) struct vop_link_args /* { struct vnode *a_tdvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap; { VOP_ABORTOP(ap->a_tdvp, ap->a_cnp); vput(ap->a_tdvp); return EOPNOTSUPP; } /* * 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 * 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. */ static 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; { u_char toname[11]; int error; int newparent = 0; int sourceisadirectory = 0; u_long cn; daddr_t bn; struct vnode *tvp = ap->a_tvp; struct componentname *fcnp = ap->a_fcnp; struct proc *p = fcnp->cn_proc; 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 msdosfsmount *pmp; struct direntry *dotdotp; struct direntry *ep; struct buf *bp; fddep = VTODE(ap->a_fdvp); fdep = VTODE(ap->a_fvp); tddep = VTODE(ap->a_tdvp); tdep = tvp ? VTODE(tvp) : NULL; pmp = fddep->de_pmp; /* Check for cross-device rename */ if ((ap->a_fvp->v_mount != ap->a_tdvp->v_mount) || (tvp && (ap->a_fvp->v_mount != tvp->v_mount))) { error = EXDEV; goto bad; } /* * 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 *) ap->a_tcnp->cn_nameptr, toname, ap->a_tcnp->cn_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 ((ap->a_fcnp->cn_namelen == 1 && ap->a_fcnp->cn_nameptr[0] == '.') || fddep == fdep || (ap->a_fcnp->cn_flags | ap->a_tcnp->cn_flags) & ISDOTDOT) { VOP_ABORTOP(ap->a_tdvp, ap->a_tcnp); vput(ap->a_tdvp); if (tvp) vput(tvp); VOP_ABORTOP(ap->a_fdvp, ap->a_fcnp); vrele(ap->a_fdvp); vrele(ap->a_fvp); 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) { vput(ap->a_tvp); tdep = NULL; } /* doscheckpath() vput()'s tddep */ error = doscheckpath(fdep, tddep); tddep = NULL; if (error) goto bad; if ((ap->a_tcnp->cn_flags & SAVESTART) == 0) panic("msdosfs_rename(): lost to startdir"); error = relookup(ap->a_tdvp, &tvp, ap->a_tcnp); if (error) goto bad; tddep = VTODE(ap->a_tdvp); tdep = tvp ? VTODE(tvp) : 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; } cache_purge(DETOV(tddep)); } else { /* destination is file */ if (sourceisadirectory) { error = EISDIR; goto bad; } } error = removede(tddep,tdep); if (error) goto bad; vput(ap->a_tvp); tdep = NULL; } /* * 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 */ vn_lock(ap->a_fvp, LK_EXCLUSIVE, p); /* ap->a_fdvp is already locked */ error = readep(fddep->de_pmp, fdep->de_dirclust, fdep->de_diroffset, &bp, &ep); if (error) { VOP_UNLOCK(ap->a_fvp, 0, p); goto bad; } bcopy(toname, ep->deName, 11); error = bwrite(bp); if (error) { VOP_UNLOCK(ap->a_fvp, 0, p); 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 NULL */ } else { u_long dirsize = 0L; /* * 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. */ vn_lock(ap->a_fvp, LK_EXCLUSIVE, p); 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, tddep, (struct denode **) 0); if (fdep->de_Attributes & ATTR_DIRECTORY) { fdep->de_FileSize = dirsize; } if (error) { /* should put back filename */ VOP_UNLOCK(ap->a_fvp, 0, p); goto bad; } vn_lock(ap->a_fdvp, LK_EXCLUSIVE, p); error = readep(fddep->de_pmp, fddep->de_fndclust, fddep->de_fndoffset, &bp, &ep); if (error) { VOP_UNLOCK(ap->a_fvp, 0, p); VOP_UNLOCK(ap->a_fdvp, 0, p); goto bad; } ep->deName[0] = SLOT_DELETED; error = bwrite(bp); if (error) { VOP_UNLOCK(ap->a_fvp, 0, p); VOP_UNLOCK(ap->a_fdvp, 0, p); goto bad; } if (!sourceisadirectory) { fdep->de_dirclust = tddep->de_fndclust; fdep->de_diroffset = tddep->de_fndoffset; reinsert(fdep); } VOP_UNLOCK(ap->a_fdvp, 0, p); } /* 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 == MSDOSFSROOT) { /* this should never happen */ panic("msdosfs_rename(): updating .. in root directory?"); } 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 */ VOP_UNLOCK(ap->a_fvp, 0, p); goto bad; } dotdotp = (struct direntry *) bp->b_data + 1; putushort(dotdotp->deStartCluster, tddep->de_StartCluster); error = bwrite(bp); VOP_UNLOCK(ap->a_fvp, 0, p); if (error) { /* should really panic here, fs is corrupt */ goto bad; } } else VOP_UNLOCK(ap->a_fvp, 0, p); bad: ; vrele(DETOV(fdep)); vrele(DETOV(fddep)); if (tdep) vput(DETOV(tdep)); if (tddep) vput(DETOV(tddep)); return error; } static 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 */ } }; static 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; { int bn; int error; u_long newcluster; struct denode *pdep; struct denode *ndep; struct direntry *denp; struct denode ndirent; struct msdosfsmount *pmp; struct buf *bp; struct timespec ts; u_short dDate, dTime; pdep = VTODE(ap->a_dvp); /* * 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) { free(ap->a_cnp->cn_pnbuf, M_NAMEI); vput(ap->a_dvp); return ENOSPC; } pmp = pdep->de_pmp; /* * Allocate a cluster to hold the about to be created directory. */ error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); if (error) { free(ap->a_cnp->cn_pnbuf, M_NAMEI); vput(ap->a_dvp); 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); /* 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->deStartCluster, newcluster); TIMEVAL_TO_TIMESPEC(&time, &ts); unix2dostime(&ts, &dDate, &dTime); putushort(denp->deDate, dDate); putushort(denp->deTime, dTime); denp++; putushort(denp->deStartCluster, pdep->de_StartCluster); putushort(denp->deDate, dDate); putushort(denp->deTime, dTime); error = bwrite(bp); if (error) { clusterfree(pmp, newcluster, NULL); free(ap->a_cnp->cn_pnbuf, M_NAMEI); vput(ap->a_dvp); 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 *)ap->a_cnp->cn_nameptr, ndep->de_Name, ap->a_cnp->cn_namelen); TIMEVAL_TO_TIMESPEC(&time, &ts); unix2dostime(&ts, &ndep->de_Date, &ndep->de_Time); ndep->de_StartCluster = newcluster; ndep->de_Attributes = ATTR_DIRECTORY; error = createde(ndep, pdep, &ndep); if (error) { clusterfree(pmp, newcluster, NULL); } else { *ap->a_vpp = DETOV(ndep); } free(ap->a_cnp->cn_pnbuf, M_NAMEI); #ifdef MSDOSFS_DEBUG printf("msdosfs_mkdir(): vput(%08x)\n", ap->a_dvp); #endif vput(ap->a_dvp); return error; } static int msdosfs_rmdir(ap) struct vop_rmdir_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap; { struct denode *ddep; struct denode *dep; int error = 0; ddep = VTODE(ap->a_dvp); /* parent dir of dir to delete */ dep = VTODE(ap->a_vp);/* directory to delete */ /* * 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 vput() on dep is done we give * up access and eventually msdosfs_reclaim() will be called which * will remove it from the denode cache. */ error = removede(ddep,dep); if (error) 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)); vput(ap->a_dvp); ap->a_dvp = NULL; /* * Truncate the directory that is being deleted. */ error = detrunc(dep, (u_long) 0, IO_SYNC, NOCRED, NULL); cache_purge(DETOV(dep)); out: ; if (ap->a_dvp) vput(ap->a_dvp); vput(ap->a_vp); return error; } /* * DOS filesystems don't know what symlinks are. */ static 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; { free(ap->a_cnp->cn_pnbuf, M_NAMEI); vput(ap->a_dvp); 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). */ static struct dos_dirent { u_long d_fileno; u_short d_reclen; u_char d_type; u_char d_namlen; u_char d_name[24]; } rootdots[2] = { { 1, /* d_fileno */ sizeof(struct direntry), /* d_reclen */ DT_DIR, /* d_type */ 1, /* d_namlen */ "." /* d_name */ }, { 1, /* d_fileno */ sizeof(struct direntry), /* d_reclen */ DT_DIR, /* d_type */ 2, /* d_namlen */ ".." /* d_name */ } }; static int msdosfs_readdir(ap) struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; int *a_ncookies; u_long **a_cookies; } */ *ap; { 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(ap->a_vp); struct msdosfsmount *pmp = dep->de_pmp; struct direntry *dentp; struct dirent *prev; struct dirent *crnt; u_char dirbuf[512]; /* holds converted dos directories */ struct uio *uio = ap->a_uio; off_t off; int ncookies = 0; #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); 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; off = uio->uio_offset; /* * 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", * uio->uio_offset); */ bias = 2 * sizeof(struct direntry); if (uio->uio_offset < 2 * sizeof(struct direntry)) { if (uio->uio_offset && uio->uio_offset != sizeof(struct direntry)) { error = EINVAL; goto out; } n = 1; if (!uio->uio_offset) { n = 2; ncookies++; } ncookies++; error = uiomove((char *) rootdots + uio->uio_offset, n * sizeof(struct direntry), uio); } } while (!error && uio->uio_resid > 0) { 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) break; 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_data + on); prev = 0; crnt = (struct dirent *) dirbuf; while ((char *) dentp < bp->b_data + 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_type = DT_UNKNOWN; prev->d_namlen = 0; prev->d_name[0] = 0; ncookies++; } } else { /* * 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); } crnt->d_fileno = fileno; crnt->d_reclen = sizeof(struct direntry); crnt->d_type = (dentp->deAttributes & ATTR_DIRECTORY) ? DT_DIR : DT_REG; 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; ncookies++; } dentp++; 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; } } if (pushout) { pushout = 0; error = uiomove(dirbuf, (char *) crnt - (char *) dirbuf, uio); } #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 || (uio->uio_offset - bias) == dep->de_FileSize) bp->b_flags |= B_AGE; #endif /* if 0 */ brelse(bp); if (n == 0) break; } out: ; uio->uio_resid += lost; if (!error && ap->a_ncookies != NULL) { struct dirent* dpStart; struct dirent* dpEnd; struct dirent* dp; u_long *cookies; u_long *cookiep; if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) panic("msdosfs_readdir: unexpected uio from NFS server"); dpStart = (struct dirent *) (uio->uio_iov->iov_base - (uio->uio_offset - off)); dpEnd = (struct dirent *) uio->uio_iov->iov_base; cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK); for (dp = dpStart, cookiep = cookies; dp < dpEnd; dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { off += dp->d_reclen; *cookiep++ = (u_long) off; } *ap->a_ncookies = ncookies; *ap->a_cookies = cookies; } /* * Set the eofflag (NFS uses it) */ if (ap->a_eofflag) if (dep->de_FileSize - (uio->uio_offset - bias) <= 0) *ap->a_eofflag = 1; else *ap->a_eofflag = 0; return error; } /* * DOS filesystems don't know what symlinks are. */ static int msdosfs_readlink(ap) struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *ap; { return EINVAL; } static 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; } static int msdosfs_lock(ap) struct vop_lock_args /* { struct vnode *a_vp; int a_flags; struct proc *a_p; } */ *ap; { struct vnode *vp = ap->a_vp; return (lockmgr(&VTODE(vp)->de_lock, ap->a_flags, &vp->v_interlock, ap->a_p)); } int msdosfs_unlock(ap) struct vop_unlock_args /* { struct vnode *a_vp; int a_flags; struct proc *a_p; } */ *ap; { struct vnode *vp = ap->a_vp; return (lockmgr(&VTODE(vp)->de_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock, ap->a_p)); } int msdosfs_islocked(ap) struct vop_islocked_args /* { struct vnode *a_vp; } */ *ap; { return (lockstatus(&VTODE(ap->a_vp)->de_lock)); } /* * 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 */ static 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; int *a_runb; } */ *ap; { struct denode *dep = VTODE(ap->a_vp); 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; } if (ap->a_runb) { *ap->a_runb = 0; } return pcbmap(dep, ap->a_bn, ap->a_bnp, 0); } static 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; } static 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 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) { error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0); if (error) 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; } static 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 %ld, diroffset %ld ", dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); printf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev)); lockmgr_printinfo(&dep->de_lock); printf("\n"); return 0; } static 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 */ } static 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; /* 255? */ 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; } } /* Global vfs data structures for msdosfs */ vop_t **msdosfs_vnodeop_p; static struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { { &vop_default_desc, (vop_t *)vn_default_error }, { &vop_lookup_desc, (vop_t *)vfs_cache_lookup }, /* lookup */ { &vop_cachedlookup_desc, (vop_t *)msdosfs_lookup }, /* lookup */ { &vop_create_desc, (vop_t *)msdosfs_create }, /* create */ { &vop_mknod_desc, (vop_t *)msdosfs_mknod }, /* mknod */ { &vop_open_desc, (vop_t *)msdosfs_open }, /* open */ { &vop_close_desc, (vop_t *)msdosfs_close }, /* close */ { &vop_access_desc, (vop_t *)msdosfs_access }, /* access */ { &vop_getattr_desc, (vop_t *)msdosfs_getattr }, /* getattr */ { &vop_setattr_desc, (vop_t *)msdosfs_setattr }, /* setattr */ { &vop_read_desc, (vop_t *)msdosfs_read }, /* read */ { &vop_write_desc, (vop_t *)msdosfs_write }, /* write */ { &vop_ioctl_desc, (vop_t *)msdosfs_ioctl }, /* ioctl */ { &vop_select_desc, (vop_t *)msdosfs_select }, /* select */ { &vop_mmap_desc, (vop_t *)msdosfs_mmap }, /* mmap */ { &vop_fsync_desc, (vop_t *)msdosfs_fsync }, /* fsync */ { &vop_seek_desc, (vop_t *)msdosfs_seek }, /* seek */ { &vop_remove_desc, (vop_t *)msdosfs_remove }, /* remove */ { &vop_link_desc, (vop_t *)msdosfs_link }, /* link */ { &vop_rename_desc, (vop_t *)msdosfs_rename }, /* rename */ { &vop_mkdir_desc, (vop_t *)msdosfs_mkdir }, /* mkdir */ { &vop_rmdir_desc, (vop_t *)msdosfs_rmdir }, /* rmdir */ { &vop_symlink_desc, (vop_t *)msdosfs_symlink }, /* symlink */ { &vop_readdir_desc, (vop_t *)msdosfs_readdir }, /* readdir */ { &vop_readlink_desc, (vop_t *)msdosfs_readlink }, /* readlink */ { &vop_abortop_desc, (vop_t *)msdosfs_abortop }, /* abortop */ { &vop_inactive_desc, (vop_t *)msdosfs_inactive }, /* inactive */ { &vop_reclaim_desc, (vop_t *)msdosfs_reclaim }, /* reclaim */ { &vop_lock_desc, (vop_t *)msdosfs_lock }, /* lock */ { &vop_unlock_desc, (vop_t *)msdosfs_unlock }, /* unlock */ { &vop_bmap_desc, (vop_t *)msdosfs_bmap }, /* bmap */ { &vop_strategy_desc, (vop_t *)msdosfs_strategy }, /* strategy */ { &vop_print_desc, (vop_t *)msdosfs_print }, /* print */ { &vop_islocked_desc, (vop_t *)msdosfs_islocked }, /* islocked */ { &vop_pathconf_desc, (vop_t *)msdosfs_pathconf }, /* pathconf */ { &vop_advlock_desc, (vop_t *)msdosfs_advlock }, /* advlock */ { &vop_reallocblks_desc, (vop_t *)msdosfs_reallocblks }, /* reallocblks */ { &vop_bwrite_desc, (vop_t *)vn_bwrite }, /* bwrite */ { NULL, NULL } }; static struct vnodeopv_desc msdosfs_vnodeop_opv_desc = { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; VNODEOP_SET(msdosfs_vnodeop_opv_desc);