diff options
Diffstat (limited to 'sys/msdosfs/msdosfs_vnops.c')
-rw-r--r-- | sys/msdosfs/msdosfs_vnops.c | 1905 |
1 files changed, 0 insertions, 1905 deletions
diff --git a/sys/msdosfs/msdosfs_vnops.c b/sys/msdosfs/msdosfs_vnops.c deleted file mode 100644 index b942d30a8b9bf..0000000000000 --- a/sys/msdosfs/msdosfs_vnops.c +++ /dev/null @@ -1,1905 +0,0 @@ -/* $FreeBSD$ */ -/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ - -/*- - * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. - * Copyright (C) 1994, 1995, 1997 TooLs GmbH. - * All rights reserved. - * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by TooLs GmbH. - * 4. The name of TooLs GmbH may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; - * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR - * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF - * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ -/* - * Written by Paul Popelka (paulp@uts.amdahl.com) - * - * You can do anything you want with this software, just don't say you wrote - * it, and don't remove this notice. - * - * This software is provided "as is". - * - * The author supplies this software to be publicly redistributed on the - * understanding that the author is not responsible for the correct - * functioning of this software in any circumstances and is not liable for - * any damages caused by this software. - * - * October 1992 - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/namei.h> -#include <sys/resourcevar.h> /* defines plimit structure in proc struct */ -#include <sys/kernel.h> -#include <sys/stat.h> -#include <sys/bio.h> -#include <sys/buf.h> -#include <sys/proc.h> -#include <sys/mount.h> -#include <sys/unistd.h> -#include <sys/vnode.h> -#include <sys/malloc.h> -#include <sys/dirent.h> -#include <sys/signalvar.h> - -#include <vm/vm.h> -#include <vm/vm_extern.h> -#include <vm/vnode_pager.h> - -#include <machine/mutex.h> - -#include <msdosfs/bpb.h> -#include <msdosfs/direntry.h> -#include <msdosfs/denode.h> -#include <msdosfs/msdosfsmount.h> -#include <msdosfs/fat.h> - -#define DOS_FILESIZE_MAX 0xffffffff - -/* - * 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_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_fsync __P((struct vop_fsync_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_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_pathconf __P((struct vop_pathconf_args *ap)); - -/* - * 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 %p, vap %p\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_fndoffset >= pdep->de_FileSize) { - error = ENOSPC; - goto bad; - } - - /* - * 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 - bzero(&ndirent, sizeof(ndirent)); - error = uniqdosname(pdep, cnp, ndirent.de_Name); - if (error) - goto bad; - - ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? - ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; - ndirent.de_LowerCase = 0; - ndirent.de_StartCluster = 0; - ndirent.de_FileSize = 0; - ndirent.de_dev = pdep->de_dev; - ndirent.de_devvp = pdep->de_devvp; - ndirent.de_pmp = pdep->de_pmp; - ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; - getnanotime(&ts); - DETIMES(&ndirent, &ts, &ts, &ts); - error = createde(&ndirent, pdep, &dep, cnp); - if (error) - goto bad; - *ap->a_vpp = DETOV(dep); - return (0); - -bad: - 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; -{ - - 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: - return (EINVAL); - } - /* NOTREACHED */ -} - -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); - struct timespec ts; - - mtx_lock(&vp->v_interlock); - if (vp->v_usecount > 1) { - getnanotime(&ts); - DETIMES(dep, &ts, &ts, &ts); - } - mtx_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; - mode_t file_mode, mode = ap->a_mode; - - 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; - default: - break; - } - } - - return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, - ap->a_mode, ap->a_cred, NULL)); -} - -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; -{ - struct denode *dep = VTODE(ap->a_vp); - struct msdosfsmount *pmp = dep->de_pmp; - struct vattr *vap = ap->a_vap; - mode_t mode; - struct timespec ts; - u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); - u_long fileid; - - getnanotime(&ts); - DETIMES(dep, &ts, &ts, &ts); - vap->va_fsid = dev2udev(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) { - fileid = cntobn(pmp, dep->de_StartCluster) * dirsperblk; - if (dep->de_StartCluster == MSDOSFSROOT) - fileid = 1; - } else { - fileid = cntobn(pmp, dep->de_dirclust) * dirsperblk; - if (dep->de_dirclust == MSDOSFSROOT) - fileid = roottobn(pmp, 0) * dirsperblk; - fileid += dep->de_diroffset / sizeof(struct direntry); - } - vap->va_fileid = fileid; - if ((dep->de_Attributes & ATTR_READONLY) == 0) - mode = S_IRWXU|S_IRWXG|S_IRWXO; - else - mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; - vap->va_mode = mode & pmp->pm_mask; - vap->va_uid = pmp->pm_uid; - vap->va_gid = pmp->pm_gid; - vap->va_nlink = 1; - vap->va_rdev = 0; - vap->va_size = dep->de_FileSize; - dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); - if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { - dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); - dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); - } else { - vap->va_atime = vap->va_mtime; - vap->va_ctime = vap->va_mtime; - } - vap->va_flags = 0; - if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) - vap->va_flags |= SF_ARCHIVED; - vap->va_gen = 0; - vap->va_blocksize = pmp->pm_bpcluster; - vap->va_bytes = - (dep->de_FileSize + pmp->pm_crbomask) & ~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 msdosfsmount *pmp = dep->de_pmp; - struct vattr *vap = ap->a_vap; - struct ucred *cred = ap->a_cred; - int error = 0; - -#ifdef MSDOSFS_DEBUG - printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", - ap->a_vp, vap, cred, ap->a_p); -#endif - - /* - * 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)) { -#ifdef MSDOSFS_DEBUG - printf("msdosfs_setattr(): returning EINVAL\n"); - printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", - vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); - printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\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_flags != VNOVAL) { - if (vp->v_mount->mnt_flag & MNT_RDONLY) - return (EROFS); - if (cred->cr_uid != pmp->pm_uid && - (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) - return (error); - /* - * We are very inconsistent about handling unsupported - * attributes. We ignored 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 EOPNOTSUPP; - 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 != (gid_t)VNOVAL) { - uid_t uid; - gid_t gid; - - if (vp->v_mount->mnt_flag & MNT_RDONLY) - return (EROFS); - uid = vap->va_uid; - if (uid == (uid_t)VNOVAL) - uid = pmp->pm_uid; - gid = vap->va_gid; - if (gid == (gid_t)VNOVAL) - gid = pmp->pm_gid; - if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || - (gid != pmp->pm_gid && !groupmember(gid, cred))) && - (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) - return error; - if (uid != pmp->pm_uid || gid != 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); - /* NOT REACHED */ - case VLNK: - case VREG: - if (vp->v_mount->mnt_flag & MNT_RDONLY) - return (EROFS); - break; - default: - break; - } - error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); - if (error) - return error; - } - if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { - if (vp->v_mount->mnt_flag & MNT_RDONLY) - return (EROFS); - if (cred->cr_uid != pmp->pm_uid && - (error = suser_xxx(cred, ap->a_p, PRISON_ROOT)) && - ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || - (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p)))) - return (error); - if (vp->v_type != VDIR) { - if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && - vap->va_atime.tv_sec != VNOVAL) - unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL); - if (vap->va_mtime.tv_sec != VNOVAL) - unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL); - dep->de_Attributes |= ATTR_ARCHIVE; - dep->de_flag |= DE_MODIFIED; - } - } - /* - * DOS files only have the ability to have their writability - * attribute set, so we use the owner write bit to set the readonly - * attribute. - */ - if (vap->va_mode != (mode_t)VNOVAL) { - if (vp->v_mount->mnt_flag & MNT_RDONLY) - return (EROFS); - if (cred->cr_uid != pmp->pm_uid && - (error = suser_xxx(cred, ap->a_p, PRISON_ROOT))) - return (error); - if (vp->v_type != VDIR) { - /* 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 (deupdat(dep, 1)); -} - -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 blsize; - int isadir; - int orig_resid; - u_int n; - u_long diff; - u_long on; - daddr_t lbn; - daddr_t rablock; - int rasize; - int seqcount; - 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 (uio->uio_offset < 0) - return (EINVAL); - - if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) - return (0); - /* - * If they didn't ask for any data, then we are done. - */ - orig_resid = uio->uio_resid; - if (orig_resid <= 0) - return (0); - - seqcount = ap->a_ioflag >> 16; - - isadir = dep->de_Attributes & ATTR_DIRECTORY; - do { - if (uio->uio_offset >= dep->de_FileSize) - break; - lbn = de_cluster(pmp, uio->uio_offset); - /* - * 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) { - /* convert cluster # to block # */ - error = pcbmap(dep, lbn, &lbn, 0, &blsize); - if (error == E2BIG) { - error = EINVAL; - break; - } else if (error) - break; - error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); - } else { - blsize = pmp->pm_bpcluster; - rablock = lbn + 1; - if (seqcount > 1 && - de_cn2off(pmp, rablock) < dep->de_FileSize) { - rasize = pmp->pm_bpcluster; - error = breadn(vp, lbn, blsize, - &rablock, &rasize, 1, NOCRED, &bp); - } else { - error = bread(vp, lbn, blsize, NOCRED, &bp); - } - } - if (error) { - brelse(bp); - break; - } - on = uio->uio_offset & pmp->pm_crbomask; - diff = pmp->pm_bpcluster - on; - n = diff > uio->uio_resid ? uio->uio_resid : diff; - diff = dep->de_FileSize - uio->uio_offset; - if (diff < n) - n = diff; - diff = blsize - bp->b_resid; - if (diff < n) - n = diff; - error = uiomove(bp->b_data + on, (int) n, uio); - brelse(bp); - } while (error == 0 && uio->uio_resid > 0 && n != 0); - if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && - (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) - dep->de_flag |= DE_ACCESS; - 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 croffset; - int resid; - u_long 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; - -#ifdef MSDOSFS_DEBUG - printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", - vp, uio, ioflag, cred); - printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\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; - thisvp = vp; - break; - case VDIR: - return EISDIR; - default: - panic("msdosfs_write(): bad file type"); - } - - if (uio->uio_offset < 0) - return (EFBIG); - - if (uio->uio_resid == 0) - return (0); - - /* - * If they've exceeded their filesize limit, tell them about it. - */ - if (p && - ((uoff_t)uio->uio_offset + uio->uio_resid > - p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { - PROC_LOCK(p); - psignal(p, SIGXFSZ); - PROC_UNLOCK(p); - return (EFBIG); - } - - if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) - return (EFBIG); - - /* - * 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; - - /* - * 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); - error = extendfile(dep, count, NULL, NULL, 0); - if (error && (error != ENOSPC || (ioflag & IO_UNIT))) - goto errexit; - lastcn = dep->de_fc[FC_LASTFC].fc_frcn; - } else - lastcn = de_clcount(pmp, osize) - 1; - - do { - if (de_cluster(pmp, uio->uio_offset) > 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); - } - - bn = de_cluster(pmp, uio->uio_offset); - if ((uio->uio_offset & pmp->pm_crbomask) == 0 - && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) - > de_cluster(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 (bp->b_blkno == bp->b_lblkno) { - error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, - 0, 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) { - brelse(bp); - 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 (error) { - brelse(bp); - break; - } - - /* - * 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) - error = deupdat(dep, 1); - return (error); -} - -/* - * 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; -{ - struct vnode *vp = ap->a_vp; - int s; - struct buf *bp, *nbp; - - /* - * Flush all dirty buffers associated with a vnode. - */ -loop: - s = splbio(); - for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { - nbp = TAILQ_NEXT(bp, b_vnbufs); - if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) - continue; - if ((bp->b_flags & B_DELWRI) == 0) - panic("msdosfs_fsync: not dirty"); - bremfree(bp); - 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 (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { - vprint("msdosfs_fsync: dirty", vp); - goto loop; - } -#endif - splx(s); - return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); -} - -static 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; - - if (ap->a_vp->v_type == VDIR) - error = EPERM; - else - error = removede(ddep, dep); -#ifdef MSDOSFS_DEBUG - printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); -#endif - return (error); -} - -/* - * DOS filesystems don't know what links are. - */ -static int -msdosfs_link(ap) - struct vop_link_args /* { - struct vnode *a_tdvp; - struct vnode *a_vp; - struct componentname *a_cnp; - } */ *ap; -{ - 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 - */ -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; -{ - struct vnode *tdvp = ap->a_tdvp; - struct vnode *fvp = ap->a_fvp; - struct vnode *fdvp = ap->a_fdvp; - struct vnode *tvp = ap->a_tvp; - struct componentname *tcnp = ap->a_tcnp; - struct componentname *fcnp = ap->a_fcnp; - struct proc *p = fcnp->cn_proc; - struct denode *ip, *xp, *dp, *zp; - u_char toname[11], oldname[11]; - u_long from_diroffset, to_diroffset; - u_char to_count; - int doingdirectory = 0, newparent = 0; - int error; - u_long cn; - daddr_t bn; - struct denode *fddep; /* from file's parent directory */ - struct denode *fdep; /* from file or directory */ - struct denode *tddep; /* to file's parent directory */ - struct denode *tdep; /* to file or directory */ - struct msdosfsmount *pmp; - struct direntry *dotdotp; - 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; - - 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: - if (tdvp == tvp) - vrele(tdvp); - else - vput(tdvp); - if (tvp) - vput(tvp); - vrele(fdvp); - vrele(fvp); - return (error); - } - - /* - * If source and dest are the same, do nothing. - */ - if (tvp == fvp) { - error = 0; - goto abortit; - } - - error = vn_lock(fvp, LK_EXCLUSIVE, p); - if (error) - 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) || - (tcnp->cn_flags & ISDOTDOT) || - (ip->de_flag & DE_RENAME)) { - VOP_UNLOCK(fvp, 0, p); - error = EINVAL; - goto abortit; - } - ip->de_flag |= DE_RENAME; - doingdirectory++; - } - - /* - * When the target exists, both the directory - * and target vnodes are returned locked. - */ - dp = VTODE(tdvp); - xp = tvp ? VTODE(tvp) : NULL; - /* - * Remember direntry place to use for destination - */ - to_diroffset = dp->de_fndoffset; - to_count = dp->de_fndcnt; - - /* - * 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, 0, p); - 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, - * so we have to do a relookup afterwards - */ - error = doscheckpath(ip, dp); - if (error) - goto out; - if ((tcnp->cn_flags & SAVESTART) == 0) - panic("msdosfs_rename: lost to startdir"); - error = relookup(tdvp, &tvp, tcnp); - if (error) - goto out; - dp = VTODE(tdvp); - xp = tvp ? VTODE(tvp) : NULL; - } - - if (xp != NULL) { - /* - * 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; - } - error = removede(dp, xp); - if (error) - goto bad; - vput(tvp); - xp = NULL; - } - - /* - * Convert the filename in tcnp into a dos filename. We copy this - * into the denode and directory entry for the destination - * file/directory. - */ - error = uniqdosname(VTODE(tdvp), tcnp, toname); - if (error) - goto abortit; - - /* - * Since from wasn't locked at various places above, - * have to do a relookup here. - */ - fcnp->cn_flags &= ~MODMASK; - fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; - if ((fcnp->cn_flags & SAVESTART) == 0) - panic("msdosfs_rename: lost from startdir"); - if (!newparent) - VOP_UNLOCK(tdvp, 0, p); - if (relookup(fdvp, &fvp, fcnp) == 0) - vrele(fdvp); - if (fvp == NULL) { - /* - * From name has disappeared. - */ - if (doingdirectory) - panic("rename: lost dir entry"); - vrele(ap->a_fvp); - if (newparent) - VOP_UNLOCK(tdvp, 0, p); - vrele(tdvp); - return 0; - } - xp = VTODE(fvp); - zp = VTODE(fdvp); - from_diroffset = zp->de_fndoffset; - - /* - * Ensure that the directory entry still exists and has not - * changed till now. If the source is a file the entry may - * have been unlinked or renamed. In either case there is - * no further work to be done. If the source is a directory - * then it cannot have been rmdir'ed or renamed; this is - * prohibited by the DE_RENAME flag. - */ - if (xp != ip) { - if (doingdirectory) - panic("rename: lost dir entry"); - vrele(ap->a_fvp); - VOP_UNLOCK(fvp, 0, p); - if (newparent) - VOP_UNLOCK(fdvp, 0, p); - xp = NULL; - } else { - vrele(fvp); - xp = NULL; - - /* - * First write a new entry in the destination - * directory and mark the entry in the source directory - * as deleted. 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(ip->de_Name, oldname, 11); - bcopy(toname, ip->de_Name, 11); /* update denode */ - dp->de_fndoffset = to_diroffset; - dp->de_fndcnt = to_count; - error = createde(ip, dp, (struct denode **)0, tcnp); - if (error) { - bcopy(oldname, ip->de_Name, 11); - if (newparent) - VOP_UNLOCK(fdvp, 0, p); - VOP_UNLOCK(fvp, 0, p); - goto bad; - } - ip->de_refcnt++; - zp->de_fndoffset = from_diroffset; - error = removede(zp, ip); - if (error) { - /* XXX should really panic here, fs is corrupt */ - if (newparent) - VOP_UNLOCK(fdvp, 0, p); - VOP_UNLOCK(fvp, 0, p); - goto bad; - } - if (!doingdirectory) { - error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, - &ip->de_dirclust, 0); - if (error) { - /* XXX should really panic here, fs is corrupt */ - if (newparent) - VOP_UNLOCK(fdvp, 0, p); - VOP_UNLOCK(fvp, 0, p); - goto bad; - } - if (ip->de_dirclust == MSDOSFSROOT) - ip->de_diroffset = to_diroffset; - else - ip->de_diroffset = to_diroffset & pmp->pm_crbomask; - } - reinsert(ip); - if (newparent) - VOP_UNLOCK(fdvp, 0, p); - } - - /* - * 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?"); - } else - bn = cntobn(pmp, cn); - error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, - NOCRED, &bp); - if (error) { - /* XXX should really panic here, fs is corrupt */ - brelse(bp); - VOP_UNLOCK(fvp, 0, p); - goto bad; - } - dotdotp = (struct direntry *)bp->b_data + 1; - putushort(dotdotp->deStartCluster, dp->de_StartCluster); - if (FAT32(pmp)) - putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); - error = bwrite(bp); - if (error) { - /* XXX should really panic here, fs is corrupt */ - VOP_UNLOCK(fvp, 0, p); - goto bad; - } - } - - VOP_UNLOCK(fvp, 0, p); -bad: - if (xp) - vput(tvp); - vput(tdvp); -out: - ip->de_flag &= ~DE_RENAME; - vrele(fdvp); - vrele(fvp); - return (error); - -} - -static struct { - struct direntry dot; - struct direntry dotdot; -} dosdirtemplate = { - { ". ", " ", /* the . entry */ - ATTR_DIRECTORY, /* file attribute */ - 0, /* reserved */ - 0, { 0, 0 }, { 0, 0 }, /* create time & date */ - { 0, 0 }, /* access date */ - { 0, 0 }, /* high bits of start cluster */ - { 210, 4 }, { 210, 4 }, /* modify time & date */ - { 0, 0 }, /* startcluster */ - { 0, 0, 0, 0 } /* filesize */ - }, - { ".. ", " ", /* the .. entry */ - ATTR_DIRECTORY, /* file attribute */ - 0, /* reserved */ - 0, { 0, 0 }, { 0, 0 }, /* create time & date */ - { 0, 0 }, /* access date */ - { 0, 0 }, /* high bits of start cluster */ - { 210, 4 }, { 210, 4 }, /* modify time & 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; -{ - struct componentname *cnp = ap->a_cnp; - struct denode *dep; - struct denode *pdep = VTODE(ap->a_dvp); - struct direntry *denp; - struct msdosfsmount *pmp = pdep->de_pmp; - struct buf *bp; - u_long newcluster, pcl; - int bn; - int error; - struct denode ndirent; - struct timespec ts; - - /* - * 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_fndoffset >= pdep->de_FileSize) { - error = ENOSPC; - goto bad2; - } - - /* - * Allocate a cluster to hold the about to be created directory. - */ - error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); - if (error) - goto bad2; - - bzero(&ndirent, sizeof(ndirent)); - ndirent.de_pmp = pmp; - ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; - getnanotime(&ts); - DETIMES(&ndirent, &ts, &ts, &ts); - - /* - * 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].deCDate, ndirent.de_CDate); - putushort(denp[0].deCTime, ndirent.de_CTime); - denp[0].deCHundredth = ndirent.de_CHun; - putushort(denp[0].deADate, ndirent.de_ADate); - putushort(denp[0].deMDate, ndirent.de_MDate); - putushort(denp[0].deMTime, ndirent.de_MTime); - pcl = pdep->de_StartCluster; - if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) - pcl = 0; - putushort(denp[1].deStartCluster, pcl); - putushort(denp[1].deCDate, ndirent.de_CDate); - putushort(denp[1].deCTime, ndirent.de_CTime); - denp[1].deCHundredth = ndirent.de_CHun; - putushort(denp[1].deADate, ndirent.de_ADate); - putushort(denp[1].deMDate, ndirent.de_MDate); - putushort(denp[1].deMTime, ndirent.de_MTime); - if (FAT32(pmp)) { - putushort(denp[0].deHighClust, newcluster >> 16); - putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); - } - - error = bwrite(bp); - if (error) - 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 - error = uniqdosname(pdep, cnp, ndirent.de_Name); - if (error) - goto bad; - - ndirent.de_Attributes = ATTR_DIRECTORY; - ndirent.de_LowerCase = 0; - ndirent.de_StartCluster = newcluster; - ndirent.de_FileSize = 0; - ndirent.de_dev = pdep->de_dev; - ndirent.de_devvp = pdep->de_devvp; - error = createde(&ndirent, pdep, &dep, cnp); - if (error) - goto bad; - *ap->a_vpp = DETOV(dep); - return (0); - -bad: - clusterfree(pmp, newcluster, NULL); -bad2: - return (error); -} - -static 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; - struct proc *p = cnp->cn_proc; - int error; - - ip = VTODE(vp); - dp = VTODE(dvp); - - /* - * 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) || ip->de_flag & DE_RENAME) { - 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(dp, ip); - 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. - */ - cache_purge(dvp); - VOP_UNLOCK(dvp, 0, p); - /* - * Truncate the directory that is being deleted. - */ - error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, p); - cache_purge(vp); - - vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p); -out: - 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; -{ - return (EOPNOTSUPP); -} - -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; - long n; - int blsize; - long on; - u_long cn; - u_long fileno; - u_long dirsperblk; - 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; - struct uio *uio = ap->a_uio; - u_long *cookies = NULL; - int ncookies = 0; - off_t offset, off; - int chksum = -1; - -#ifdef MSDOSFS_DEBUG - printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\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); - - /* - * To be safe, initialize dirbuf - */ - bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); - - /* - * 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. - */ - off = offset = uio->uio_offset; - if (uio->uio_resid < sizeof(struct direntry) || - (offset & (sizeof(struct direntry) - 1))) - return (EINVAL); - - if (ap->a_ncookies) { - ncookies = uio->uio_resid / 16; - MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, - M_WAITOK); - *ap->a_cookies = cookies; - *ap->a_ncookies = ncookies; - } - - dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); - - /* - * 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 - || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { -#if 0 - printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", - offset); -#endif - bias = 2 * sizeof(struct direntry); - if (offset < bias) { - for (n = (int)offset / sizeof(struct direntry); - n < 2; n++) { - if (FAT32(pmp)) - dirbuf.d_fileno = cntobn(pmp, - pmp->pm_rootdirblk) - * dirsperblk; - else - 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 = GENERIC_DIRSIZ(&dirbuf); - if (uio->uio_resid < dirbuf.d_reclen) - goto out; - error = uiomove((caddr_t) &dirbuf, - dirbuf.d_reclen, uio); - if (error) - goto out; - offset += sizeof(struct direntry); - off = offset; - if (cookies) { - *cookies++ = offset; - if (--ncookies <= 0) - goto out; - } - } - } - } - - off = offset; - while (uio->uio_resid > 0) { - lbn = de_cluster(pmp, offset - bias); - 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); - error = pcbmap(dep, lbn, &bn, &cn, &blsize); - if (error) - break; - error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); - if (error) { - brelse(bp); - return (error); - } - n = min(n, blsize - 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++, offset += sizeof(struct direntry)) { -#if 0 - printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", - dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); -#endif - /* - * If this is an unused entry, we can stop. - */ - if (dentp->deName[0] == SLOT_EMPTY) { - brelse(bp); - goto out; - } - /* - * Skip deleted entries. - */ - if (dentp->deName[0] == SLOT_DELETED) { - chksum = -1; - continue; - } - - /* - * Handle Win95 long directory entries - */ - if (dentp->deAttributes == ATTR_WIN95) { - if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) - continue; - chksum = win2unixfn((struct winentry *)dentp, - &dirbuf, chksum, - pmp->pm_flags & MSDOSFSMNT_U2WTABLE, - pmp->pm_u2w); - continue; - } - - /* - * Skip volume labels - */ - if (dentp->deAttributes & ATTR_VOLUME) { - chksum = -1; - continue; - } - /* - * This computation of d_fileno must match - * the computation of va_fileid in - * msdosfs_getattr. - */ - if (dentp->deAttributes & ATTR_DIRECTORY) { - fileno = getushort(dentp->deStartCluster); - if (FAT32(pmp)) - fileno |= getushort(dentp->deHighClust) << 16; - /* if this is the root directory */ - if (fileno == MSDOSFSROOT) - if (FAT32(pmp)) - fileno = cntobn(pmp, - pmp->pm_rootdirblk) - * dirsperblk; - else - fileno = 1; - else - fileno = cntobn(pmp, fileno) * dirsperblk; - dirbuf.d_fileno = fileno; - dirbuf.d_type = DT_DIR; - } else { - dirbuf.d_fileno = offset / sizeof(struct direntry); - dirbuf.d_type = DT_REG; - } - if (chksum != winChksum(dentp->deName)) - dirbuf.d_namlen = dos2unixfn(dentp->deName, - (u_char *)dirbuf.d_name, - dentp->deLowerCase | - ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? - (LCASE_BASE | LCASE_EXT) : 0), - pmp->pm_flags & MSDOSFSMNT_U2WTABLE, - pmp->pm_d2u, - pmp->pm_flags & MSDOSFSMNT_ULTABLE, - pmp->pm_ul); - else - dirbuf.d_name[dirbuf.d_namlen] = 0; - chksum = -1; - dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); - if (uio->uio_resid < dirbuf.d_reclen) { - brelse(bp); - goto out; - } - error = uiomove((caddr_t) &dirbuf, - dirbuf.d_reclen, uio); - if (error) { - brelse(bp); - goto out; - } - if (cookies) { - *cookies++ = offset + sizeof(struct direntry); - if (--ncookies <= 0) { - brelse(bp); - goto out; - } - } - off = offset + sizeof(struct direntry); - } - brelse(bp); - } -out: - /* Subtract unused cookies */ - if (ap->a_ncookies) - *ap->a_ncookies -= ncookies; - - uio->uio_offset = off; - - /* - * Set the eofflag (NFS uses it) - */ - if (ap->a_eofflag) { - if (dep->de_FileSize - (offset - bias) <= 0) - *ap->a_eofflag = 1; - else - *ap->a_eofflag = 0; - } - return (error); -} - -/* - * 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, 0)); -} - -static int -msdosfs_strategy(ap) - struct vop_strategy_args /* { - struct vnode *a_vp; - 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, 0); - if (error) { - bp->b_error = error; - bp->b_ioflags |= BIO_ERROR; - bufdone(bp); - return (error); - } - if ((long)bp->b_blkno == -1) - vfs_bio_clrbuf(bp); - } - if (bp->b_blkno == -1) { - bufdone(bp); - return (0); - } - /* - * Read/write the block from/to the disk that contains the desired - * file block. - */ - vp = dep->de_devvp; - bp->b_dev = vp->v_rdev; - VOP_STRATEGY(vp, bp); - 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 %lu, dircluster %lu, diroffset %lu ", - dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); - printf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev)); - lockmgr_printinfo(&ap->a_vp->v_lock); - printf("\n"); - return (0); -} - -static int -msdosfs_pathconf(ap) - struct vop_pathconf_args /* { - struct vnode *a_vp; - int a_name; - int *a_retval; - } */ *ap; -{ - struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; - - switch (ap->a_name) { - case _PC_LINK_MAX: - *ap->a_retval = 1; - return (0); - case _PC_NAME_MAX: - *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 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 */ -vop_t **msdosfs_vnodeop_p; -static struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { - { &vop_default_desc, (vop_t *) vop_defaultop }, - { &vop_access_desc, (vop_t *) msdosfs_access }, - { &vop_bmap_desc, (vop_t *) msdosfs_bmap }, - { &vop_cachedlookup_desc, (vop_t *) msdosfs_lookup }, - { &vop_close_desc, (vop_t *) msdosfs_close }, - { &vop_create_desc, (vop_t *) msdosfs_create }, - { &vop_fsync_desc, (vop_t *) msdosfs_fsync }, - { &vop_getattr_desc, (vop_t *) msdosfs_getattr }, - { &vop_inactive_desc, (vop_t *) msdosfs_inactive }, - { &vop_islocked_desc, (vop_t *) vop_stdislocked }, - { &vop_link_desc, (vop_t *) msdosfs_link }, - { &vop_lock_desc, (vop_t *) vop_stdlock }, - { &vop_lookup_desc, (vop_t *) vfs_cache_lookup }, - { &vop_mkdir_desc, (vop_t *) msdosfs_mkdir }, - { &vop_mknod_desc, (vop_t *) msdosfs_mknod }, - { &vop_pathconf_desc, (vop_t *) msdosfs_pathconf }, - { &vop_print_desc, (vop_t *) msdosfs_print }, - { &vop_read_desc, (vop_t *) msdosfs_read }, - { &vop_readdir_desc, (vop_t *) msdosfs_readdir }, - { &vop_reclaim_desc, (vop_t *) msdosfs_reclaim }, - { &vop_remove_desc, (vop_t *) msdosfs_remove }, - { &vop_rename_desc, (vop_t *) msdosfs_rename }, - { &vop_rmdir_desc, (vop_t *) msdosfs_rmdir }, - { &vop_setattr_desc, (vop_t *) msdosfs_setattr }, - { &vop_strategy_desc, (vop_t *) msdosfs_strategy }, - { &vop_symlink_desc, (vop_t *) msdosfs_symlink }, - { &vop_unlock_desc, (vop_t *) vop_stdunlock }, - { &vop_write_desc, (vop_t *) msdosfs_write }, - { NULL, NULL } -}; -static struct vnodeopv_desc msdosfs_vnodeop_opv_desc = - { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; - -VNODEOP_SET(msdosfs_vnodeop_opv_desc); |