msdosfs_vnops.c revision 175294
1281SN/A/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vnops.c 175294 2008-01-13 14:44:15Z attilio $ */ 21129Sjjg/* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ 3281SN/A 4281SN/A/*- 5281SN/A * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6281SN/A * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7281SN/A * All rights reserved. 8281SN/A * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9281SN/A * 10281SN/A * Redistribution and use in source and binary forms, with or without 11281SN/A * modification, are permitted provided that the following conditions 12281SN/A * are met: 13281SN/A * 1. Redistributions of source code must retain the above copyright 14281SN/A * notice, this list of conditions and the following disclaimer. 15281SN/A * 2. Redistributions in binary form must reproduce the above copyright 16281SN/A * notice, this list of conditions and the following disclaimer in the 17281SN/A * documentation and/or other materials provided with the distribution. 18281SN/A * 3. All advertising materials mentioning features or use of this software 19281SN/A * must display the following acknowledgement: 20281SN/A * This product includes software developed by TooLs GmbH. 21281SN/A * 4. The name of TooLs GmbH may not be used to endorse or promote products 22281SN/A * derived from this software without specific prior written permission. 23281SN/A * 24281SN/A * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25281SN/A * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26281SN/A * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27281SN/A * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 281038Sdfuchs * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29410SN/A * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30281SN/A * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31281SN/A * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32281SN/A * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33281SN/A * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34281SN/A */ 35281SN/A/*- 36281SN/A * Written by Paul Popelka (paulp@uts.amdahl.com) 37281SN/A * 38281SN/A * You can do anything you want with this software, just don't say you wrote 391129Sjjg * it, and don't remove this notice. 401129Sjjg * 41281SN/A * This software is provided "as is". 42281SN/A * 43281SN/A * The author supplies this software to be publicly redistributed on the 44281SN/A * understanding that the author is not responsible for the correct 45281SN/A * functioning of this software in any circumstances and is not liable for 46281SN/A * any damages caused by this software. 47281SN/A * 48281SN/A * October 1992 491129Sjjg */ 501129Sjjg 51281SN/A#include <sys/param.h> 52281SN/A#include <sys/systm.h> 53281SN/A#include <sys/bio.h> 54281SN/A#include <sys/buf.h> 55281SN/A#include <sys/clock.h> 56281SN/A#include <sys/dirent.h> 57281SN/A#include <sys/lock.h> 58281SN/A#include <sys/lockf.h> 59281SN/A#include <sys/malloc.h> 60281SN/A#include <sys/mount.h> 61281SN/A#include <sys/mutex.h> 62281SN/A#include <sys/namei.h> 63281SN/A#include <sys/priv.h> 64281SN/A#include <sys/proc.h> 65705Sjoehw#include <sys/resourcevar.h> 66281SN/A#include <sys/signalvar.h> 67281SN/A#include <sys/stat.h> 68281SN/A#include <sys/unistd.h> 69281SN/A#include <sys/vnode.h> 70281SN/A 71281SN/A#include <vm/vm.h> 72281SN/A#include <vm/vm_extern.h> 73281SN/A 74281SN/A#include <fs/msdosfs/bpb.h> 75281SN/A#include <fs/msdosfs/direntry.h> 76281SN/A#include <fs/msdosfs/denode.h> 77281SN/A#include <fs/msdosfs/fat.h> 78281SN/A#include <fs/msdosfs/msdosfsmount.h> 79281SN/A 80281SN/A#define DOS_FILESIZE_MAX 0xffffffff 81281SN/A 82281SN/A/* 83281SN/A * Prototypes for MSDOSFS vnode operations 84281SN/A */ 85281SN/Astatic vop_advlock_t msdosfs_advlock; 86281SN/Astatic vop_create_t msdosfs_create; 87281SN/Astatic vop_mknod_t msdosfs_mknod; 88281SN/Astatic vop_open_t msdosfs_open; 89281SN/Astatic vop_close_t msdosfs_close; 90281SN/Astatic vop_access_t msdosfs_access; 91281SN/Astatic vop_getattr_t msdosfs_getattr; 92281SN/Astatic vop_setattr_t msdosfs_setattr; 93281SN/Astatic vop_read_t msdosfs_read; 94281SN/Astatic vop_write_t msdosfs_write; 95281SN/Astatic vop_fsync_t msdosfs_fsync; 96281SN/Astatic vop_remove_t msdosfs_remove; 97281SN/Astatic vop_link_t msdosfs_link; 98281SN/Astatic vop_rename_t msdosfs_rename; 99281SN/Astatic vop_mkdir_t msdosfs_mkdir; 100281SN/Astatic vop_rmdir_t msdosfs_rmdir; 101281SN/Astatic vop_symlink_t msdosfs_symlink; 102281SN/Astatic vop_readdir_t msdosfs_readdir; 103281SN/Astatic vop_bmap_t msdosfs_bmap; 104281SN/Astatic vop_strategy_t msdosfs_strategy; 105281SN/Astatic vop_print_t msdosfs_print; 106281SN/Astatic vop_pathconf_t msdosfs_pathconf; 107281SN/Astatic vop_vptofh_t msdosfs_vptofh; 108281SN/A 109281SN/A/* 110281SN/A * Some general notes: 111281SN/A * 112281SN/A * In the ufs filesystem the inodes, superblocks, and indirect blocks are 113281SN/A * read/written using the vnode for the filesystem. Blocks that represent 114281SN/A * the contents of a file are read/written using the vnode for the file 115281SN/A * (including directories when they are read/written as files). This 116281SN/A * presents problems for the dos filesystem because data that should be in 117281SN/A * an inode (if dos had them) resides in the directory itself. Since we 118281SN/A * must update directory entries without the benefit of having the vnode 119281SN/A * for the directory we must use the vnode for the filesystem. This means 120281SN/A * that when a directory is actually read/written (via read, write, or 121281SN/A * readdir, or seek) we must use the vnode for the filesystem instead of 122281SN/A * the vnode for the directory as would happen in ufs. This is to insure we 123281SN/A * retreive the correct block from the buffer cache since the hash value is 124281SN/A * based upon the vnode address and the desired block number. 125281SN/A */ 126281SN/A 127281SN/A/* 128281SN/A * Create a regular file. On entry the directory to contain the file being 129281SN/A * created is locked. We must release before we return. We must also free 130281SN/A * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or 131281SN/A * only if the SAVESTART bit in cn_flags is clear on success. 132281SN/A */ 133281SN/Astatic int 134281SN/Amsdosfs_create(ap) 135281SN/A struct vop_create_args /* { 136281SN/A struct vnode *a_dvp; 137281SN/A struct vnode **a_vpp; 138281SN/A struct componentname *a_cnp; 139281SN/A struct vattr *a_vap; 140281SN/A } */ *ap; 1411038Sdfuchs{ 1421038Sdfuchs struct componentname *cnp = ap->a_cnp; 1431038Sdfuchs struct denode ndirent; 1441038Sdfuchs struct denode *dep; 1451038Sdfuchs struct denode *pdep = VTODE(ap->a_dvp); 1461038Sdfuchs struct timespec ts; 1471038Sdfuchs int error; 1481038Sdfuchs 1491038Sdfuchs#ifdef MSDOSFS_DEBUG 1501038Sdfuchs printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); 1511038Sdfuchs#endif 1521038Sdfuchs 1531038Sdfuchs /* 154410SN/A * If this is the root directory and there is no space left we 155410SN/A * can't do anything. This is because the root directory can not 156281SN/A * change size. 157281SN/A */ 158281SN/A if (pdep->de_StartCluster == MSDOSFSROOT 159281SN/A && pdep->de_fndoffset >= pdep->de_FileSize) { 160281SN/A error = ENOSPC; 161410SN/A goto bad; 162281SN/A } 163281SN/A 164281SN/A /* 165281SN/A * Create a directory entry for the file, then call createde() to 166410SN/A * have it installed. NOTE: DOS files are always executable. We 167281SN/A * use the absence of the owner write bit to make the file 168281SN/A * readonly. 169281SN/A */ 170726Savstepan#ifdef DIAGNOSTIC 171410SN/A if ((cnp->cn_flags & HASBUF) == 0) 172410SN/A panic("msdosfs_create: no name"); 173705Sjoehw#endif 174410SN/A bzero(&ndirent, sizeof(ndirent)); 175410SN/A error = uniqdosname(pdep, cnp, ndirent.de_Name); 176705Sjoehw if (error) 177705Sjoehw goto bad; 178705Sjoehw 179705Sjoehw ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? 180705Sjoehw ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; 181705Sjoehw ndirent.de_LowerCase = 0; 182705Sjoehw ndirent.de_StartCluster = 0; 183705Sjoehw ndirent.de_FileSize = 0; 184705Sjoehw ndirent.de_dev = pdep->de_dev; 185705Sjoehw ndirent.de_pmp = pdep->de_pmp; 186705Sjoehw ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 187705Sjoehw getnanotime(&ts); 188705Sjoehw DETIMES(&ndirent, &ts, &ts, &ts); 189705Sjoehw error = createde(&ndirent, pdep, &dep, cnp); 190705Sjoehw if (error) 191705Sjoehw goto bad; 192410SN/A *ap->a_vpp = DETOV(dep); 193410SN/A return (0); 194705Sjoehw 195410SN/Abad: 196489SN/A return (error); 197489SN/A} 198489SN/A 199489SN/Astatic int 200489SN/Amsdosfs_mknod(ap) 201489SN/A struct vop_mknod_args /* { 202489SN/A struct vnode *a_dvp; 203410SN/A struct vnode **a_vpp; 204410SN/A struct componentname *a_cnp; 2051038Sdfuchs struct vattr *a_vap; 2061038Sdfuchs } */ *ap; 207410SN/A{ 208410SN/A 209410SN/A return (EINVAL); 210281SN/A} 211281SN/A 212410SN/Astatic int 213281SN/Amsdosfs_open(ap) 214281SN/A struct vop_open_args /* { 215281SN/A struct vnode *a_vp; 216726Savstepan int a_mode; 217410SN/A struct ucred *a_cred; 218410SN/A struct thread *a_td; 219410SN/A int a_fdidx; 220281SN/A } */ *ap; 2211096Sjoehw{ 222281SN/A struct denode *dep = VTODE(ap->a_vp); 223281SN/A vnode_create_vobject(ap->a_vp, dep->de_FileSize, ap->a_td); 224281SN/A return 0; 225410SN/A} 226281SN/A 227281SN/Astatic int 228281SN/Amsdosfs_close(ap) 229281SN/A struct vop_close_args /* { 230281SN/A struct vnode *a_vp; 231281SN/A int a_fflag; 232281SN/A struct ucred *a_cred; 233281SN/A struct thread *a_td; 234281SN/A } */ *ap; 235281SN/A{ 236281SN/A struct vnode *vp = ap->a_vp; 237281SN/A struct denode *dep = VTODE(vp); 238281SN/A struct timespec ts; 239281SN/A 240281SN/A VI_LOCK(vp); 241281SN/A if (vp->v_usecount > 1) { 242281SN/A getnanotime(&ts); 2431096Sjoehw DETIMES(dep, &ts, &ts, &ts); 244281SN/A } 245281SN/A VI_UNLOCK(vp); 246281SN/A return 0; 247410SN/A} 248410SN/A 249281SN/Astatic int 250281SN/Amsdosfs_access(ap) 251281SN/A struct vop_access_args /* { 252281SN/A struct vnode *a_vp; 253281SN/A int a_mode; 254410SN/A struct ucred *a_cred; 255410SN/A struct thread *a_td; 256410SN/A } */ *ap; 257410SN/A{ 258410SN/A struct vnode *vp = ap->a_vp; 259705Sjoehw struct denode *dep = VTODE(ap->a_vp); 260410SN/A struct msdosfsmount *pmp = dep->de_pmp; 261410SN/A mode_t file_mode, mode = ap->a_mode; 262410SN/A 263705Sjoehw file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | 264705Sjoehw ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); 265705Sjoehw file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 266705Sjoehw 267705Sjoehw /* 268705Sjoehw * Disallow writing to directories and regular files if the 269705Sjoehw * filesystem is read-only. 270705Sjoehw */ 271705Sjoehw if (mode & VWRITE) { 272705Sjoehw switch (vp->v_type) { 273705Sjoehw case VDIR: 274705Sjoehw case VREG: 275705Sjoehw if (vp->v_mount->mnt_flag & MNT_RDONLY) 276705Sjoehw return (EROFS); 277705Sjoehw break; 278705Sjoehw default: 279705Sjoehw break; 280705Sjoehw } 281410SN/A } 282410SN/A 283705Sjoehw return (vaccess(vp->v_type, file_mode, pmp->pm_uid, pmp->pm_gid, 284410SN/A ap->a_mode, ap->a_cred, NULL)); 285705Sjoehw} 286557SN/A 287557SN/Astatic int 288557SN/Amsdosfs_getattr(ap) 289541SN/A struct vop_getattr_args /* { 290541SN/A struct vnode *a_vp; 291541SN/A struct vattr *a_vap; 292489SN/A struct ucred *a_cred; 293489SN/A struct thread *a_td; 294489SN/A } */ *ap; 295489SN/A{ 296410SN/A struct denode *dep = VTODE(ap->a_vp); 297410SN/A struct msdosfsmount *pmp = dep->de_pmp; 298705Sjoehw struct vattr *vap = ap->a_vap; 299410SN/A mode_t mode; 300410SN/A struct timespec ts; 301410SN/A u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 302281SN/A uint64_t fileid; 303410SN/A 304281SN/A getnanotime(&ts); 305410SN/A DETIMES(dep, &ts, &ts, &ts); 306410SN/A vap->va_fsid = dev2udev(dep->de_dev); 307281SN/A /* 308281SN/A * The following computation of the fileid must be the same as that 309705Sjoehw * used in msdosfs_readdir() to compute d_fileno. If not, pwd 310281SN/A * doesn't work. 311541SN/A */ 312541SN/A if (dep->de_Attributes & ATTR_DIRECTORY) { 313541SN/A fileid = (uint64_t)cntobn(pmp, dep->de_StartCluster) * 314541SN/A dirsperblk; 315281SN/A if (dep->de_StartCluster == MSDOSFSROOT) 316281SN/A fileid = 1; 317281SN/A } else { 318281SN/A fileid = (uint64_t)cntobn(pmp, dep->de_dirclust) * 319410SN/A dirsperblk; 320410SN/A if (dep->de_dirclust == MSDOSFSROOT) 321410SN/A fileid = (uint64_t)roottobn(pmp, 0) * dirsperblk; 322281SN/A fileid += (uoff_t)dep->de_diroffset / sizeof(struct direntry); 323281SN/A } 324281SN/A 325281SN/A if (pmp->pm_flags & MSDOSFS_LARGEFS) 326281SN/A vap->va_fileid = msdosfs_fileno_map(pmp->pm_mountp, fileid); 327410SN/A else 328410SN/A vap->va_fileid = (long)fileid; 329281SN/A 330281SN/A if ((dep->de_Attributes & ATTR_READONLY) == 0) 331281SN/A mode = S_IRWXU|S_IRWXG|S_IRWXO; 332281SN/A else 333281SN/A mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 334281SN/A vap->va_mode = mode & 335281SN/A (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); 336281SN/A vap->va_uid = pmp->pm_uid; 337281SN/A vap->va_gid = pmp->pm_gid; 338281SN/A vap->va_nlink = 1; 339281SN/A vap->va_rdev = 0; 340281SN/A vap->va_size = dep->de_FileSize; 341281SN/A fattime2timespec(dep->de_MDate, dep->de_MTime, 0, 0, &vap->va_mtime); 342281SN/A vap->va_ctime = vap->va_mtime; 343281SN/A if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { 344281SN/A fattime2timespec(dep->de_ADate, 0, 0, 0, &vap->va_atime); 345281SN/A fattime2timespec(dep->de_CDate, dep->de_CTime, dep->de_CHun, 346281SN/A 0, &vap->va_birthtime); 347281SN/A } else { 348281SN/A vap->va_atime = vap->va_mtime; 349281SN/A vap->va_birthtime.tv_sec = -1; 350281SN/A vap->va_birthtime.tv_nsec = 0; 351281SN/A } 352281SN/A vap->va_flags = 0; 353281SN/A if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) 354281SN/A vap->va_flags |= SF_ARCHIVED; 355281SN/A vap->va_gen = 0; 356281SN/A vap->va_blocksize = pmp->pm_bpcluster; 357281SN/A vap->va_bytes = 358281SN/A (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; 359281SN/A vap->va_type = ap->a_vp->v_type; 360281SN/A vap->va_filerev = dep->de_modrev; 361281SN/A return (0); 362281SN/A} 363281SN/A 364281SN/Astatic int 365281SN/Amsdosfs_setattr(ap) 366281SN/A struct vop_setattr_args /* { 367281SN/A struct vnode *a_vp; 368281SN/A struct vattr *a_vap; 369281SN/A struct ucred *a_cred; 370281SN/A struct thread *a_td; 371281SN/A } */ *ap; 372281SN/A{ 373281SN/A struct vnode *vp = ap->a_vp; 374281SN/A struct denode *dep = VTODE(ap->a_vp); 375281SN/A struct msdosfsmount *pmp = dep->de_pmp; 376281SN/A struct vattr *vap = ap->a_vap; 377281SN/A struct ucred *cred = ap->a_cred; 378281SN/A int error = 0; 379281SN/A 380281SN/A#ifdef MSDOSFS_DEBUG 381281SN/A printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", 382281SN/A ap->a_vp, vap, cred, ap->a_td); 383281SN/A#endif 384281SN/A 385281SN/A /* 386281SN/A * Check for unsettable attributes. 387281SN/A */ 388281SN/A if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 389281SN/A (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 390281SN/A (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 391281SN/A (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 392281SN/A#ifdef MSDOSFS_DEBUG 393281SN/A printf("msdosfs_setattr(): returning EINVAL\n"); 394281SN/A printf(" va_type %d, va_nlink %x, va_fsid %lx, va_fileid %lx\n", 395281SN/A vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); 396281SN/A printf(" va_blocksize %lx, va_rdev %x, va_bytes %qx, va_gen %lx\n", 397281SN/A vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); 398281SN/A printf(" va_uid %x, va_gid %x\n", 399281SN/A vap->va_uid, vap->va_gid); 400281SN/A#endif 401281SN/A return (EINVAL); 402281SN/A } 403281SN/A if (vap->va_flags != VNOVAL) { 404281SN/A if (vp->v_mount->mnt_flag & MNT_RDONLY) 405281SN/A return (EROFS); 406281SN/A if (cred->cr_uid != pmp->pm_uid) { 407281SN/A error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 408281SN/A if (error) 409281SN/A return (error); 410281SN/A } 411281SN/A /* 412281SN/A * We are very inconsistent about handling unsupported 413281SN/A * attributes. We ignored the access time and the 414281SN/A * read and execute bits. We were strict for the other 415281SN/A * attributes. 416281SN/A * 417281SN/A * Here we are strict, stricter than ufs in not allowing 418281SN/A * users to attempt to set SF_SETTABLE bits or anyone to 419281SN/A * set unsupported bits. However, we ignore attempts to 420281SN/A * set ATTR_ARCHIVE for directories `cp -pr' from a more 421281SN/A * sensible filesystem attempts it a lot. 422281SN/A */ 423281SN/A if (vap->va_flags & SF_SETTABLE) { 424281SN/A error = priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0); 425281SN/A if (error) 426281SN/A return (error); 427281SN/A } 428281SN/A if (vap->va_flags & ~SF_ARCHIVED) 429281SN/A return EOPNOTSUPP; 430281SN/A if (vap->va_flags & SF_ARCHIVED) 431281SN/A dep->de_Attributes &= ~ATTR_ARCHIVE; 432281SN/A else if (!(dep->de_Attributes & ATTR_DIRECTORY)) 433281SN/A dep->de_Attributes |= ATTR_ARCHIVE; 434281SN/A dep->de_flag |= DE_MODIFIED; 435281SN/A } 436281SN/A 437281SN/A if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 438281SN/A uid_t uid; 439281SN/A gid_t gid; 440281SN/A 441281SN/A if (vp->v_mount->mnt_flag & MNT_RDONLY) 442281SN/A return (EROFS); 443281SN/A uid = vap->va_uid; 444281SN/A if (uid == (uid_t)VNOVAL) 445281SN/A uid = pmp->pm_uid; 446281SN/A gid = vap->va_gid; 447281SN/A if (gid == (gid_t)VNOVAL) 448281SN/A gid = pmp->pm_gid; 449281SN/A if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || 450281SN/A (gid != pmp->pm_gid && !groupmember(gid, cred))) { 451281SN/A error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 452281SN/A if (error) 453281SN/A return (error); 454281SN/A } 455281SN/A if (uid != pmp->pm_uid || gid != pmp->pm_gid) 456281SN/A return EINVAL; 457281SN/A } 458281SN/A 459281SN/A if (vap->va_size != VNOVAL) { 460281SN/A switch (vp->v_type) { 461281SN/A case VDIR: 462281SN/A return (EISDIR); 463281SN/A case VREG: 464281SN/A /* 465281SN/A * Truncation is only supported for regular files, 466281SN/A * Disallow it if the filesystem is read-only. 467281SN/A */ 468281SN/A if (vp->v_mount->mnt_flag & MNT_RDONLY) 469281SN/A return (EROFS); 470281SN/A break; 471281SN/A default: 472281SN/A /* 473281SN/A * According to POSIX, the result is unspecified 474281SN/A * for file types other than regular files, 475281SN/A * directories and shared memory objects. We 476281SN/A * don't support any file types except regular 477281SN/A * files and directories in this file system, so 478281SN/A * this (default) case is unreachable and can do 479281SN/A * anything. Keep falling through to detrunc() 480281SN/A * for now. 481281SN/A */ 482281SN/A break; 483281SN/A } 484281SN/A error = detrunc(dep, vap->va_size, 0, cred, ap->a_td); 485281SN/A if (error) 486281SN/A return error; 487281SN/A } 488281SN/A if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 489281SN/A if (vp->v_mount->mnt_flag & MNT_RDONLY) 490281SN/A return (EROFS); 491418SN/A if (vap->va_vaflags & VA_UTIMES_NULL) { 492418SN/A error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 493418SN/A if (error) 494418SN/A error = VOP_ACCESS(vp, VWRITE, cred, 495418SN/A ap->a_td); 496418SN/A } else 497418SN/A error = VOP_ACCESS(vp, VADMIN, cred, ap->a_td); 498418SN/A if (vp->v_type != VDIR) { 499418SN/A if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && 500418SN/A vap->va_atime.tv_sec != VNOVAL) { 501418SN/A dep->de_flag &= ~DE_ACCESS; 502418SN/A timespec2fattime(&vap->va_atime, 0, 503418SN/A &dep->de_ADate, NULL, NULL); 504418SN/A } 505421SN/A if (vap->va_mtime.tv_sec != VNOVAL) { 506421SN/A dep->de_flag &= ~DE_UPDATE; 507726Savstepan timespec2fattime(&vap->va_mtime, 0, 508418SN/A &dep->de_MDate, &dep->de_MTime, NULL); 509418SN/A } 510281SN/A dep->de_Attributes |= ATTR_ARCHIVE; 511281SN/A dep->de_flag |= DE_MODIFIED; 512281SN/A } 513281SN/A } 514281SN/A /* 515281SN/A * DOS files only have the ability to have their writability 516281SN/A * attribute set, so we use the owner write bit to set the readonly 517281SN/A * attribute. 518281SN/A */ 519281SN/A if (vap->va_mode != (mode_t)VNOVAL) { 520281SN/A if (vp->v_mount->mnt_flag & MNT_RDONLY) 521281SN/A return (EROFS); 522281SN/A if (cred->cr_uid != pmp->pm_uid) { 523281SN/A error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0); 524281SN/A if (error) 525281SN/A return (error); 526281SN/A } 527281SN/A if (vp->v_type != VDIR) { 528281SN/A /* We ignore the read and execute bits. */ 529281SN/A if (vap->va_mode & VWRITE) 530281SN/A dep->de_Attributes &= ~ATTR_READONLY; 531281SN/A else 532281SN/A dep->de_Attributes |= ATTR_READONLY; 533281SN/A dep->de_Attributes |= ATTR_ARCHIVE; 534281SN/A dep->de_flag |= DE_MODIFIED; 535281SN/A } 536281SN/A } 537281SN/A return (deupdat(dep, 0)); 538281SN/A} 539281SN/A 540281SN/Astatic int 541281SN/Amsdosfs_read(ap) 542281SN/A struct vop_read_args /* { 543281SN/A struct vnode *a_vp; 544281SN/A struct uio *a_uio; 545281SN/A int a_ioflag; 546281SN/A struct ucred *a_cred; 547 } */ *ap; 548{ 549 int error = 0; 550 int blsize; 551 int isadir; 552 int orig_resid; 553 u_int n; 554 u_long diff; 555 u_long on; 556 daddr_t lbn; 557 daddr_t rablock; 558 int rasize; 559 int seqcount; 560 struct buf *bp; 561 struct vnode *vp = ap->a_vp; 562 struct denode *dep = VTODE(vp); 563 struct msdosfsmount *pmp = dep->de_pmp; 564 struct uio *uio = ap->a_uio; 565 566 /* 567 * If they didn't ask for any data, then we are done. 568 */ 569 orig_resid = uio->uio_resid; 570 if (orig_resid == 0) 571 return (0); 572 573 /* 574 * The caller is supposed to ensure that 575 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 576 * We don't need to check for large offsets as in ffs because 577 * dep->de_FileSize <= DOS_FILESIZE_MAX < OFF_MAX, so large 578 * offsets cannot cause overflow even in theory. 579 */ 580 581 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 582 583 isadir = dep->de_Attributes & ATTR_DIRECTORY; 584 do { 585 if (uio->uio_offset >= dep->de_FileSize) 586 break; 587 lbn = de_cluster(pmp, uio->uio_offset); 588 rablock = lbn + 1; 589 blsize = pmp->pm_bpcluster; 590 on = uio->uio_offset & pmp->pm_crbomask; 591 /* 592 * If we are operating on a directory file then be sure to 593 * do i/o with the vnode for the filesystem instead of the 594 * vnode for the directory. 595 */ 596 if (isadir) { 597 /* convert cluster # to block # */ 598 error = pcbmap(dep, lbn, &lbn, 0, &blsize); 599 if (error == E2BIG) { 600 error = EINVAL; 601 break; 602 } else if (error) 603 break; 604 error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp); 605 } else if (de_cn2off(pmp, rablock) >= dep->de_FileSize) { 606 error = bread(vp, lbn, blsize, NOCRED, &bp); 607 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 608 error = cluster_read(vp, dep->de_FileSize, lbn, blsize, 609 NOCRED, on + uio->uio_resid, seqcount, &bp); 610 } else if (seqcount > 1) { 611 rasize = blsize; 612 error = breadn(vp, lbn, 613 blsize, &rablock, &rasize, 1, NOCRED, &bp); 614 } else { 615 error = bread(vp, lbn, blsize, NOCRED, &bp); 616 } 617 if (error) { 618 brelse(bp); 619 break; 620 } 621 diff = pmp->pm_bpcluster - on; 622 n = diff > uio->uio_resid ? uio->uio_resid : diff; 623 diff = dep->de_FileSize - uio->uio_offset; 624 if (diff < n) 625 n = diff; 626 diff = blsize - bp->b_resid; 627 if (diff < n) 628 n = diff; 629 error = uiomove(bp->b_data + on, (int) n, uio); 630 brelse(bp); 631 } while (error == 0 && uio->uio_resid > 0 && n != 0); 632 if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && 633 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 634 dep->de_flag |= DE_ACCESS; 635 return (error); 636} 637 638/* 639 * Write data to a file or directory. 640 */ 641static int 642msdosfs_write(ap) 643 struct vop_write_args /* { 644 struct vnode *a_vp; 645 struct uio *a_uio; 646 int a_ioflag; 647 struct ucred *a_cred; 648 } */ *ap; 649{ 650 int n; 651 int croffset; 652 int resid; 653 u_long osize; 654 int error = 0; 655 u_long count; 656 int seqcount; 657 daddr_t bn, lastcn; 658 struct buf *bp; 659 int ioflag = ap->a_ioflag; 660 struct uio *uio = ap->a_uio; 661 struct thread *td = uio->uio_td; 662 struct vnode *vp = ap->a_vp; 663 struct vnode *thisvp; 664 struct denode *dep = VTODE(vp); 665 struct msdosfsmount *pmp = dep->de_pmp; 666 struct ucred *cred = ap->a_cred; 667 668#ifdef MSDOSFS_DEBUG 669 printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", 670 vp, uio, ioflag, cred); 671 printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", 672 dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); 673#endif 674 675 switch (vp->v_type) { 676 case VREG: 677 if (ioflag & IO_APPEND) 678 uio->uio_offset = dep->de_FileSize; 679 thisvp = vp; 680 break; 681 case VDIR: 682 return EISDIR; 683 default: 684 panic("msdosfs_write(): bad file type"); 685 } 686 687 /* 688 * This is needed (unlike in ffs_write()) because we extend the 689 * file outside of the loop but we don't want to extend the file 690 * for writes of 0 bytes. 691 */ 692 if (uio->uio_resid == 0) 693 return (0); 694 695 /* 696 * The caller is supposed to ensure that 697 * uio->uio_offset >= 0 and uio->uio_resid >= 0. 698 */ 699 if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) 700 return (EFBIG); 701 702 /* 703 * If they've exceeded their filesize limit, tell them about it. 704 */ 705 if (td != NULL) { 706 PROC_LOCK(td->td_proc); 707 if ((uoff_t)uio->uio_offset + uio->uio_resid > 708 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 709 psignal(td->td_proc, SIGXFSZ); 710 PROC_UNLOCK(td->td_proc); 711 return (EFBIG); 712 } 713 PROC_UNLOCK(td->td_proc); 714 } 715 716 /* 717 * If the offset we are starting the write at is beyond the end of 718 * the file, then they've done a seek. Unix filesystems allow 719 * files with holes in them, DOS doesn't so we must fill the hole 720 * with zeroed blocks. 721 */ 722 if (uio->uio_offset > dep->de_FileSize) { 723 error = deextend(dep, uio->uio_offset, cred); 724 if (error) 725 return (error); 726 } 727 728 /* 729 * Remember some values in case the write fails. 730 */ 731 resid = uio->uio_resid; 732 osize = dep->de_FileSize; 733 734 /* 735 * If we write beyond the end of the file, extend it to its ultimate 736 * size ahead of the time to hopefully get a contiguous area. 737 */ 738 if (uio->uio_offset + resid > osize) { 739 count = de_clcount(pmp, uio->uio_offset + resid) - 740 de_clcount(pmp, osize); 741 error = extendfile(dep, count, NULL, NULL, 0); 742 if (error && (error != ENOSPC || (ioflag & IO_UNIT))) 743 goto errexit; 744 lastcn = dep->de_fc[FC_LASTFC].fc_frcn; 745 } else 746 lastcn = de_clcount(pmp, osize) - 1; 747 748 seqcount = ioflag >> IO_SEQSHIFT; 749 do { 750 if (de_cluster(pmp, uio->uio_offset) > lastcn) { 751 error = ENOSPC; 752 break; 753 } 754 755 croffset = uio->uio_offset & pmp->pm_crbomask; 756 n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); 757 if (uio->uio_offset + n > dep->de_FileSize) { 758 dep->de_FileSize = uio->uio_offset + n; 759 /* The object size needs to be set before buffer is allocated */ 760 vnode_pager_setsize(vp, dep->de_FileSize); 761 } 762 763 bn = de_cluster(pmp, uio->uio_offset); 764 if ((uio->uio_offset & pmp->pm_crbomask) == 0 765 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) 766 > de_cluster(pmp, uio->uio_offset) 767 || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { 768 /* 769 * If either the whole cluster gets written, 770 * or we write the cluster from its start beyond EOF, 771 * then no need to read data from disk. 772 */ 773 bp = getblk(thisvp, bn, pmp->pm_bpcluster, 0, 0, 0); 774 vfs_bio_clrbuf(bp); 775 /* 776 * Do the bmap now, since pcbmap needs buffers 777 * for the fat table. (see msdosfs_strategy) 778 */ 779 if (bp->b_blkno == bp->b_lblkno) { 780 error = pcbmap(dep, bp->b_lblkno, &bn, 0, 0); 781 if (error) 782 bp->b_blkno = -1; 783 else 784 bp->b_blkno = bn; 785 } 786 if (bp->b_blkno == -1) { 787 brelse(bp); 788 if (!error) 789 error = EIO; /* XXX */ 790 break; 791 } 792 } else { 793 /* 794 * The block we need to write into exists, so read it in. 795 */ 796 error = bread(thisvp, bn, pmp->pm_bpcluster, cred, &bp); 797 if (error) { 798 brelse(bp); 799 break; 800 } 801 } 802 803 /* 804 * Should these vnode_pager_* functions be done on dir 805 * files? 806 */ 807 808 /* 809 * Copy the data from user space into the buf header. 810 */ 811 error = uiomove(bp->b_data + croffset, n, uio); 812 if (error) { 813 brelse(bp); 814 break; 815 } 816 817 /* Prepare for clustered writes in some else clauses. */ 818 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 819 bp->b_flags |= B_CLUSTEROK; 820 821 /* 822 * If IO_SYNC, then each buffer is written synchronously. 823 * Otherwise, if we have a severe page deficiency then 824 * write the buffer asynchronously. Otherwise, if on a 825 * cluster boundary then write the buffer asynchronously, 826 * combining it with contiguous clusters if permitted and 827 * possible, since we don't expect more writes into this 828 * buffer soon. Otherwise, do a delayed write because we 829 * expect more writes into this buffer soon. 830 */ 831 if (ioflag & IO_SYNC) 832 (void)bwrite(bp); 833 else if (vm_page_count_severe() || buf_dirty_count_severe()) 834 bawrite(bp); 835 else if (n + croffset == pmp->pm_bpcluster) { 836 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 837 cluster_write(vp, bp, dep->de_FileSize, 838 seqcount); 839 else 840 bawrite(bp); 841 } else 842 bdwrite(bp); 843 dep->de_flag |= DE_UPDATE; 844 } while (error == 0 && uio->uio_resid > 0); 845 846 /* 847 * If the write failed and they want us to, truncate the file back 848 * to the size it was before the write was attempted. 849 */ 850errexit: 851 if (error) { 852 if (ioflag & IO_UNIT) { 853 detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); 854 uio->uio_offset -= resid - uio->uio_resid; 855 uio->uio_resid = resid; 856 } else { 857 detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); 858 if (uio->uio_resid != resid) 859 error = 0; 860 } 861 } else if (ioflag & IO_SYNC) 862 error = deupdat(dep, 1); 863 return (error); 864} 865 866/* 867 * Flush the blocks of a file to disk. 868 * 869 * This function is worthless for vnodes that represent directories. Maybe we 870 * could just do a sync if they try an fsync on a directory file. 871 */ 872static int 873msdosfs_fsync(ap) 874 struct vop_fsync_args /* { 875 struct vnode *a_vp; 876 struct ucred *a_cred; 877 int a_waitfor; 878 struct thread *a_td; 879 } */ *ap; 880{ 881 882 vop_stdfsync(ap); 883 return (deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT)); 884} 885 886static int 887msdosfs_remove(ap) 888 struct vop_remove_args /* { 889 struct vnode *a_dvp; 890 struct vnode *a_vp; 891 struct componentname *a_cnp; 892 } */ *ap; 893{ 894 struct denode *dep = VTODE(ap->a_vp); 895 struct denode *ddep = VTODE(ap->a_dvp); 896 int error; 897 898 if (ap->a_vp->v_type == VDIR) 899 error = EPERM; 900 else 901 error = removede(ddep, dep); 902#ifdef MSDOSFS_DEBUG 903 printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); 904#endif 905 return (error); 906} 907 908/* 909 * DOS filesystems don't know what links are. 910 */ 911static int 912msdosfs_link(ap) 913 struct vop_link_args /* { 914 struct vnode *a_tdvp; 915 struct vnode *a_vp; 916 struct componentname *a_cnp; 917 } */ *ap; 918{ 919 return (EOPNOTSUPP); 920} 921 922/* 923 * Renames on files require moving the denode to a new hash queue since the 924 * denode's location is used to compute which hash queue to put the file 925 * in. Unless it is a rename in place. For example "mv a b". 926 * 927 * What follows is the basic algorithm: 928 * 929 * if (file move) { 930 * if (dest file exists) { 931 * remove dest file 932 * } 933 * if (dest and src in same directory) { 934 * rewrite name in existing directory slot 935 * } else { 936 * write new entry in dest directory 937 * update offset and dirclust in denode 938 * move denode to new hash chain 939 * clear old directory entry 940 * } 941 * } else { 942 * directory move 943 * if (dest directory exists) { 944 * if (dest is not empty) { 945 * return ENOTEMPTY 946 * } 947 * remove dest directory 948 * } 949 * if (dest and src in same directory) { 950 * rewrite name in existing entry 951 * } else { 952 * be sure dest is not a child of src directory 953 * write entry in dest directory 954 * update "." and ".." in moved directory 955 * clear old directory entry for moved directory 956 * } 957 * } 958 * 959 * On entry: 960 * source's parent directory is unlocked 961 * source file or directory is unlocked 962 * destination's parent directory is locked 963 * destination file or directory is locked if it exists 964 * 965 * On exit: 966 * all denodes should be released 967 */ 968static int 969msdosfs_rename(ap) 970 struct vop_rename_args /* { 971 struct vnode *a_fdvp; 972 struct vnode *a_fvp; 973 struct componentname *a_fcnp; 974 struct vnode *a_tdvp; 975 struct vnode *a_tvp; 976 struct componentname *a_tcnp; 977 } */ *ap; 978{ 979 struct vnode *tdvp = ap->a_tdvp; 980 struct vnode *fvp = ap->a_fvp; 981 struct vnode *fdvp = ap->a_fdvp; 982 struct vnode *tvp = ap->a_tvp; 983 struct componentname *tcnp = ap->a_tcnp; 984 struct componentname *fcnp = ap->a_fcnp; 985 struct denode *ip, *xp, *dp, *zp; 986 u_char toname[11], oldname[11]; 987 u_long from_diroffset, to_diroffset; 988 u_char to_count; 989 int doingdirectory = 0, newparent = 0; 990 int error; 991 u_long cn; 992 daddr_t bn; 993 struct denode *fddep; /* from file's parent directory */ 994 struct msdosfsmount *pmp; 995 struct direntry *dotdotp; 996 struct buf *bp; 997 998 fddep = VTODE(ap->a_fdvp); 999 pmp = fddep->de_pmp; 1000 1001 pmp = VFSTOMSDOSFS(fdvp->v_mount); 1002 1003#ifdef DIAGNOSTIC 1004 if ((tcnp->cn_flags & HASBUF) == 0 || 1005 (fcnp->cn_flags & HASBUF) == 0) 1006 panic("msdosfs_rename: no name"); 1007#endif 1008 /* 1009 * Check for cross-device rename. 1010 */ 1011 if (fvp->v_mount != tdvp->v_mount || 1012 (tvp && fvp->v_mount != tvp->v_mount)) { 1013 error = EXDEV; 1014abortit: 1015 if (tdvp == tvp) 1016 vrele(tdvp); 1017 else 1018 vput(tdvp); 1019 if (tvp) 1020 vput(tvp); 1021 vrele(fdvp); 1022 vrele(fvp); 1023 return (error); 1024 } 1025 1026 /* 1027 * If source and dest are the same, do nothing. 1028 */ 1029 if (tvp == fvp) { 1030 error = 0; 1031 goto abortit; 1032 } 1033 1034 error = vn_lock(fvp, LK_EXCLUSIVE); 1035 if (error) 1036 goto abortit; 1037 dp = VTODE(fdvp); 1038 ip = VTODE(fvp); 1039 1040 /* 1041 * Be sure we are not renaming ".", "..", or an alias of ".". This 1042 * leads to a crippled directory tree. It's pretty tough to do a 1043 * "ls" or "pwd" with the "." directory entry missing, and "cd .." 1044 * doesn't work if the ".." entry is missing. 1045 */ 1046 if (ip->de_Attributes & ATTR_DIRECTORY) { 1047 /* 1048 * Avoid ".", "..", and aliases of "." for obvious reasons. 1049 */ 1050 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1051 dp == ip || 1052 (fcnp->cn_flags & ISDOTDOT) || 1053 (tcnp->cn_flags & ISDOTDOT) || 1054 (ip->de_flag & DE_RENAME)) { 1055 VOP_UNLOCK(fvp, 0); 1056 error = EINVAL; 1057 goto abortit; 1058 } 1059 ip->de_flag |= DE_RENAME; 1060 doingdirectory++; 1061 } 1062 1063 /* 1064 * When the target exists, both the directory 1065 * and target vnodes are returned locked. 1066 */ 1067 dp = VTODE(tdvp); 1068 xp = tvp ? VTODE(tvp) : NULL; 1069 /* 1070 * Remember direntry place to use for destination 1071 */ 1072 to_diroffset = dp->de_fndoffset; 1073 to_count = dp->de_fndcnt; 1074 1075 /* 1076 * If ".." must be changed (ie the directory gets a new 1077 * parent) then the source directory must not be in the 1078 * directory heirarchy above the target, as this would 1079 * orphan everything below the source directory. Also 1080 * the user must have write permission in the source so 1081 * as to be able to change "..". We must repeat the call 1082 * to namei, as the parent directory is unlocked by the 1083 * call to doscheckpath(). 1084 */ 1085 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1086 VOP_UNLOCK(fvp, 0); 1087 if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) 1088 newparent = 1; 1089 if (doingdirectory && newparent) { 1090 if (error) /* write access check above */ 1091 goto bad; 1092 if (xp != NULL) 1093 vput(tvp); 1094 /* 1095 * doscheckpath() vput()'s dp, 1096 * so we have to do a relookup afterwards 1097 */ 1098 error = doscheckpath(ip, dp); 1099 if (error) 1100 goto out; 1101 if ((tcnp->cn_flags & SAVESTART) == 0) 1102 panic("msdosfs_rename: lost to startdir"); 1103 error = relookup(tdvp, &tvp, tcnp); 1104 if (error) 1105 goto out; 1106 dp = VTODE(tdvp); 1107 xp = tvp ? VTODE(tvp) : NULL; 1108 } 1109 1110 if (xp != NULL) { 1111 /* 1112 * Target must be empty if a directory and have no links 1113 * to it. Also, ensure source and target are compatible 1114 * (both directories, or both not directories). 1115 */ 1116 if (xp->de_Attributes & ATTR_DIRECTORY) { 1117 if (!dosdirempty(xp)) { 1118 error = ENOTEMPTY; 1119 goto bad; 1120 } 1121 if (!doingdirectory) { 1122 error = ENOTDIR; 1123 goto bad; 1124 } 1125 cache_purge(tdvp); 1126 } else if (doingdirectory) { 1127 error = EISDIR; 1128 goto bad; 1129 } 1130 error = removede(dp, xp); 1131 if (error) 1132 goto bad; 1133 vput(tvp); 1134 xp = NULL; 1135 } 1136 1137 /* 1138 * Convert the filename in tcnp into a dos filename. We copy this 1139 * into the denode and directory entry for the destination 1140 * file/directory. 1141 */ 1142 error = uniqdosname(VTODE(tdvp), tcnp, toname); 1143 if (error) 1144 goto abortit; 1145 1146 /* 1147 * Since from wasn't locked at various places above, 1148 * have to do a relookup here. 1149 */ 1150 fcnp->cn_flags &= ~MODMASK; 1151 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1152 if ((fcnp->cn_flags & SAVESTART) == 0) 1153 panic("msdosfs_rename: lost from startdir"); 1154 if (!newparent) 1155 VOP_UNLOCK(tdvp, 0); 1156 if (relookup(fdvp, &fvp, fcnp) == 0) 1157 vrele(fdvp); 1158 if (fvp == NULL) { 1159 /* 1160 * From name has disappeared. 1161 */ 1162 if (doingdirectory) 1163 panic("rename: lost dir entry"); 1164 if (newparent) 1165 VOP_UNLOCK(tdvp, 0); 1166 vrele(tdvp); 1167 vrele(ap->a_fvp); 1168 return 0; 1169 } 1170 xp = VTODE(fvp); 1171 zp = VTODE(fdvp); 1172 from_diroffset = zp->de_fndoffset; 1173 1174 /* 1175 * Ensure that the directory entry still exists and has not 1176 * changed till now. If the source is a file the entry may 1177 * have been unlinked or renamed. In either case there is 1178 * no further work to be done. If the source is a directory 1179 * then it cannot have been rmdir'ed or renamed; this is 1180 * prohibited by the DE_RENAME flag. 1181 */ 1182 if (xp != ip) { 1183 if (doingdirectory) 1184 panic("rename: lost dir entry"); 1185 VOP_UNLOCK(fvp, 0); 1186 if (newparent) 1187 VOP_UNLOCK(fdvp, 0); 1188 vrele(ap->a_fvp); 1189 xp = NULL; 1190 } else { 1191 vrele(fvp); 1192 xp = NULL; 1193 1194 /* 1195 * First write a new entry in the destination 1196 * directory and mark the entry in the source directory 1197 * as deleted. Then move the denode to the correct hash 1198 * chain for its new location in the filesystem. And, if 1199 * we moved a directory, then update its .. entry to point 1200 * to the new parent directory. 1201 */ 1202 bcopy(ip->de_Name, oldname, 11); 1203 bcopy(toname, ip->de_Name, 11); /* update denode */ 1204 dp->de_fndoffset = to_diroffset; 1205 dp->de_fndcnt = to_count; 1206 error = createde(ip, dp, (struct denode **)0, tcnp); 1207 if (error) { 1208 bcopy(oldname, ip->de_Name, 11); 1209 if (newparent) 1210 VOP_UNLOCK(fdvp, 0); 1211 VOP_UNLOCK(fvp, 0); 1212 goto bad; 1213 } 1214 ip->de_refcnt++; 1215 zp->de_fndoffset = from_diroffset; 1216 error = removede(zp, ip); 1217 if (error) { 1218 /* XXX should downgrade to ro here, fs is corrupt */ 1219 if (newparent) 1220 VOP_UNLOCK(fdvp, 0); 1221 VOP_UNLOCK(fvp, 0); 1222 goto bad; 1223 } 1224 if (!doingdirectory) { 1225 error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, 1226 &ip->de_dirclust, 0); 1227 if (error) { 1228 /* XXX should downgrade to ro here, fs is corrupt */ 1229 if (newparent) 1230 VOP_UNLOCK(fdvp, 0); 1231 VOP_UNLOCK(fvp, 0); 1232 goto bad; 1233 } 1234 if (ip->de_dirclust == MSDOSFSROOT) 1235 ip->de_diroffset = to_diroffset; 1236 else 1237 ip->de_diroffset = to_diroffset & pmp->pm_crbomask; 1238 } 1239 reinsert(ip); 1240 if (newparent) 1241 VOP_UNLOCK(fdvp, 0); 1242 } 1243 1244 /* 1245 * If we moved a directory to a new parent directory, then we must 1246 * fixup the ".." entry in the moved directory. 1247 */ 1248 if (doingdirectory && newparent) { 1249 cn = ip->de_StartCluster; 1250 if (cn == MSDOSFSROOT) { 1251 /* this should never happen */ 1252 panic("msdosfs_rename(): updating .. in root directory?"); 1253 } else 1254 bn = cntobn(pmp, cn); 1255 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 1256 NOCRED, &bp); 1257 if (error) { 1258 /* XXX should downgrade to ro here, fs is corrupt */ 1259 brelse(bp); 1260 VOP_UNLOCK(fvp, 0); 1261 goto bad; 1262 } 1263 dotdotp = (struct direntry *)bp->b_data + 1; 1264 putushort(dotdotp->deStartCluster, dp->de_StartCluster); 1265 if (FAT32(pmp)) 1266 putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); 1267 if (fvp->v_mount->mnt_flag & MNT_ASYNC) 1268 bdwrite(bp); 1269 else if ((error = bwrite(bp)) != 0) { 1270 /* XXX should downgrade to ro here, fs is corrupt */ 1271 VOP_UNLOCK(fvp, 0); 1272 goto bad; 1273 } 1274 } 1275 1276 VOP_UNLOCK(fvp, 0); 1277bad: 1278 if (xp) 1279 vput(tvp); 1280 vput(tdvp); 1281out: 1282 ip->de_flag &= ~DE_RENAME; 1283 vrele(fdvp); 1284 vrele(fvp); 1285 return (error); 1286 1287} 1288 1289static struct { 1290 struct direntry dot; 1291 struct direntry dotdot; 1292} dosdirtemplate = { 1293 { ". ", " ", /* the . entry */ 1294 ATTR_DIRECTORY, /* file attribute */ 1295 0, /* reserved */ 1296 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1297 { 0, 0 }, /* access date */ 1298 { 0, 0 }, /* high bits of start cluster */ 1299 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1300 { 0, 0 }, /* startcluster */ 1301 { 0, 0, 0, 0 } /* filesize */ 1302 }, 1303 { ".. ", " ", /* the .. entry */ 1304 ATTR_DIRECTORY, /* file attribute */ 1305 0, /* reserved */ 1306 0, { 0, 0 }, { 0, 0 }, /* create time & date */ 1307 { 0, 0 }, /* access date */ 1308 { 0, 0 }, /* high bits of start cluster */ 1309 { 210, 4 }, { 210, 4 }, /* modify time & date */ 1310 { 0, 0 }, /* startcluster */ 1311 { 0, 0, 0, 0 } /* filesize */ 1312 } 1313}; 1314 1315static int 1316msdosfs_mkdir(ap) 1317 struct vop_mkdir_args /* { 1318 struct vnode *a_dvp; 1319 struct vnode **a_vpp; 1320 struvt componentname *a_cnp; 1321 struct vattr *a_vap; 1322 } */ *ap; 1323{ 1324 struct componentname *cnp = ap->a_cnp; 1325 struct denode *dep; 1326 struct denode *pdep = VTODE(ap->a_dvp); 1327 struct direntry *denp; 1328 struct msdosfsmount *pmp = pdep->de_pmp; 1329 struct buf *bp; 1330 u_long newcluster, pcl; 1331 int bn; 1332 int error; 1333 struct denode ndirent; 1334 struct timespec ts; 1335 1336 /* 1337 * If this is the root directory and there is no space left we 1338 * can't do anything. This is because the root directory can not 1339 * change size. 1340 */ 1341 if (pdep->de_StartCluster == MSDOSFSROOT 1342 && pdep->de_fndoffset >= pdep->de_FileSize) { 1343 error = ENOSPC; 1344 goto bad2; 1345 } 1346 1347 /* 1348 * Allocate a cluster to hold the about to be created directory. 1349 */ 1350 error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); 1351 if (error) 1352 goto bad2; 1353 1354 bzero(&ndirent, sizeof(ndirent)); 1355 ndirent.de_pmp = pmp; 1356 ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; 1357 getnanotime(&ts); 1358 DETIMES(&ndirent, &ts, &ts, &ts); 1359 1360 /* 1361 * Now fill the cluster with the "." and ".." entries. And write 1362 * the cluster to disk. This way it is there for the parent 1363 * directory to be pointing at if there were a crash. 1364 */ 1365 bn = cntobn(pmp, newcluster); 1366 /* always succeeds */ 1367 bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, 0, 0); 1368 bzero(bp->b_data, pmp->pm_bpcluster); 1369 bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); 1370 denp = (struct direntry *)bp->b_data; 1371 putushort(denp[0].deStartCluster, newcluster); 1372 putushort(denp[0].deCDate, ndirent.de_CDate); 1373 putushort(denp[0].deCTime, ndirent.de_CTime); 1374 denp[0].deCHundredth = ndirent.de_CHun; 1375 putushort(denp[0].deADate, ndirent.de_ADate); 1376 putushort(denp[0].deMDate, ndirent.de_MDate); 1377 putushort(denp[0].deMTime, ndirent.de_MTime); 1378 pcl = pdep->de_StartCluster; 1379 if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) 1380 pcl = 0; 1381 putushort(denp[1].deStartCluster, pcl); 1382 putushort(denp[1].deCDate, ndirent.de_CDate); 1383 putushort(denp[1].deCTime, ndirent.de_CTime); 1384 denp[1].deCHundredth = ndirent.de_CHun; 1385 putushort(denp[1].deADate, ndirent.de_ADate); 1386 putushort(denp[1].deMDate, ndirent.de_MDate); 1387 putushort(denp[1].deMTime, ndirent.de_MTime); 1388 if (FAT32(pmp)) { 1389 putushort(denp[0].deHighClust, newcluster >> 16); 1390 putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); 1391 } 1392 1393 if (ap->a_dvp->v_mount->mnt_flag & MNT_ASYNC) 1394 bdwrite(bp); 1395 else if ((error = bwrite(bp)) != 0) 1396 goto bad; 1397 1398 /* 1399 * Now build up a directory entry pointing to the newly allocated 1400 * cluster. This will be written to an empty slot in the parent 1401 * directory. 1402 */ 1403#ifdef DIAGNOSTIC 1404 if ((cnp->cn_flags & HASBUF) == 0) 1405 panic("msdosfs_mkdir: no name"); 1406#endif 1407 error = uniqdosname(pdep, cnp, ndirent.de_Name); 1408 if (error) 1409 goto bad; 1410 1411 ndirent.de_Attributes = ATTR_DIRECTORY; 1412 ndirent.de_LowerCase = 0; 1413 ndirent.de_StartCluster = newcluster; 1414 ndirent.de_FileSize = 0; 1415 ndirent.de_dev = pdep->de_dev; 1416 error = createde(&ndirent, pdep, &dep, cnp); 1417 if (error) 1418 goto bad; 1419 *ap->a_vpp = DETOV(dep); 1420 return (0); 1421 1422bad: 1423 clusterfree(pmp, newcluster, NULL); 1424bad2: 1425 return (error); 1426} 1427 1428static int 1429msdosfs_rmdir(ap) 1430 struct vop_rmdir_args /* { 1431 struct vnode *a_dvp; 1432 struct vnode *a_vp; 1433 struct componentname *a_cnp; 1434 } */ *ap; 1435{ 1436 struct vnode *vp = ap->a_vp; 1437 struct vnode *dvp = ap->a_dvp; 1438 struct componentname *cnp = ap->a_cnp; 1439 struct denode *ip, *dp; 1440 struct thread *td = cnp->cn_thread; 1441 int error; 1442 1443 ip = VTODE(vp); 1444 dp = VTODE(dvp); 1445 1446 /* 1447 * Verify the directory is empty (and valid). 1448 * (Rmdir ".." won't be valid since 1449 * ".." will contain a reference to 1450 * the current directory and thus be 1451 * non-empty.) 1452 */ 1453 error = 0; 1454 if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { 1455 error = ENOTEMPTY; 1456 goto out; 1457 } 1458 /* 1459 * Delete the entry from the directory. For dos filesystems this 1460 * gets rid of the directory entry on disk, the in memory copy 1461 * still exists but the de_refcnt is <= 0. This prevents it from 1462 * being found by deget(). When the vput() on dep is done we give 1463 * up access and eventually msdosfs_reclaim() will be called which 1464 * will remove it from the denode cache. 1465 */ 1466 error = removede(dp, ip); 1467 if (error) 1468 goto out; 1469 /* 1470 * This is where we decrement the link count in the parent 1471 * directory. Since dos filesystems don't do this we just purge 1472 * the name cache. 1473 */ 1474 cache_purge(dvp); 1475 VOP_UNLOCK(dvp, 0); 1476 /* 1477 * Truncate the directory that is being deleted. 1478 */ 1479 error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td); 1480 cache_purge(vp); 1481 1482 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1483out: 1484 return (error); 1485} 1486 1487/* 1488 * DOS filesystems don't know what symlinks are. 1489 */ 1490static int 1491msdosfs_symlink(ap) 1492 struct vop_symlink_args /* { 1493 struct vnode *a_dvp; 1494 struct vnode **a_vpp; 1495 struct componentname *a_cnp; 1496 struct vattr *a_vap; 1497 char *a_target; 1498 } */ *ap; 1499{ 1500 return (EOPNOTSUPP); 1501} 1502 1503static int 1504msdosfs_readdir(ap) 1505 struct vop_readdir_args /* { 1506 struct vnode *a_vp; 1507 struct uio *a_uio; 1508 struct ucred *a_cred; 1509 int *a_eofflag; 1510 int *a_ncookies; 1511 u_long **a_cookies; 1512 } */ *ap; 1513{ 1514 struct mbnambuf nb; 1515 int error = 0; 1516 int diff; 1517 long n; 1518 int blsize; 1519 long on; 1520 u_long cn; 1521 uint64_t fileno; 1522 u_long dirsperblk; 1523 long bias = 0; 1524 daddr_t bn, lbn; 1525 struct buf *bp; 1526 struct denode *dep = VTODE(ap->a_vp); 1527 struct msdosfsmount *pmp = dep->de_pmp; 1528 struct direntry *dentp; 1529 struct dirent dirbuf; 1530 struct uio *uio = ap->a_uio; 1531 u_long *cookies = NULL; 1532 int ncookies = 0; 1533 off_t offset, off; 1534 int chksum = -1; 1535 1536#ifdef MSDOSFS_DEBUG 1537 printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", 1538 ap->a_vp, uio, ap->a_cred, ap->a_eofflag); 1539#endif 1540 1541 /* 1542 * msdosfs_readdir() won't operate properly on regular files since 1543 * it does i/o only with the the filesystem vnode, and hence can 1544 * retrieve the wrong block from the buffer cache for a plain file. 1545 * So, fail attempts to readdir() on a plain file. 1546 */ 1547 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) 1548 return (ENOTDIR); 1549 1550 /* 1551 * To be safe, initialize dirbuf 1552 */ 1553 bzero(dirbuf.d_name, sizeof(dirbuf.d_name)); 1554 1555 /* 1556 * If the user buffer is smaller than the size of one dos directory 1557 * entry or the file offset is not a multiple of the size of a 1558 * directory entry, then we fail the read. 1559 */ 1560 off = offset = uio->uio_offset; 1561 if (uio->uio_resid < sizeof(struct direntry) || 1562 (offset & (sizeof(struct direntry) - 1))) 1563 return (EINVAL); 1564 1565 if (ap->a_ncookies) { 1566 ncookies = uio->uio_resid / 16; 1567 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1568 M_WAITOK); 1569 *ap->a_cookies = cookies; 1570 *ap->a_ncookies = ncookies; 1571 } 1572 1573 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 1574 1575 /* 1576 * If they are reading from the root directory then, we simulate 1577 * the . and .. entries since these don't exist in the root 1578 * directory. We also set the offset bias to make up for having to 1579 * simulate these entries. By this I mean that at file offset 64 we 1580 * read the first entry in the root directory that lives on disk. 1581 */ 1582 if (dep->de_StartCluster == MSDOSFSROOT 1583 || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { 1584#if 0 1585 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", 1586 offset); 1587#endif 1588 bias = 2 * sizeof(struct direntry); 1589 if (offset < bias) { 1590 for (n = (int)offset / sizeof(struct direntry); 1591 n < 2; n++) { 1592 if (FAT32(pmp)) 1593 fileno = (uint64_t)cntobn(pmp, 1594 pmp->pm_rootdirblk) 1595 * dirsperblk; 1596 else 1597 fileno = 1; 1598 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1599 dirbuf.d_fileno = 1600 msdosfs_fileno_map(pmp->pm_mountp, 1601 fileno); 1602 } else { 1603 1604 dirbuf.d_fileno = (uint32_t)fileno; 1605 } 1606 dirbuf.d_type = DT_DIR; 1607 switch (n) { 1608 case 0: 1609 dirbuf.d_namlen = 1; 1610 strcpy(dirbuf.d_name, "."); 1611 break; 1612 case 1: 1613 dirbuf.d_namlen = 2; 1614 strcpy(dirbuf.d_name, ".."); 1615 break; 1616 } 1617 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1618 if (uio->uio_resid < dirbuf.d_reclen) 1619 goto out; 1620 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1621 if (error) 1622 goto out; 1623 offset += sizeof(struct direntry); 1624 off = offset; 1625 if (cookies) { 1626 *cookies++ = offset; 1627 if (--ncookies <= 0) 1628 goto out; 1629 } 1630 } 1631 } 1632 } 1633 1634 mbnambuf_init(&nb); 1635 off = offset; 1636 while (uio->uio_resid > 0) { 1637 lbn = de_cluster(pmp, offset - bias); 1638 on = (offset - bias) & pmp->pm_crbomask; 1639 n = min(pmp->pm_bpcluster - on, uio->uio_resid); 1640 diff = dep->de_FileSize - (offset - bias); 1641 if (diff <= 0) 1642 break; 1643 n = min(n, diff); 1644 error = pcbmap(dep, lbn, &bn, &cn, &blsize); 1645 if (error) 1646 break; 1647 error = bread(pmp->pm_devvp, bn, blsize, NOCRED, &bp); 1648 if (error) { 1649 brelse(bp); 1650 return (error); 1651 } 1652 n = min(n, blsize - bp->b_resid); 1653 if (n == 0) { 1654 brelse(bp); 1655 return (EIO); 1656 } 1657 1658 /* 1659 * Convert from dos directory entries to fs-independent 1660 * directory entries. 1661 */ 1662 for (dentp = (struct direntry *)(bp->b_data + on); 1663 (char *)dentp < bp->b_data + on + n; 1664 dentp++, offset += sizeof(struct direntry)) { 1665#if 0 1666 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", 1667 dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); 1668#endif 1669 /* 1670 * If this is an unused entry, we can stop. 1671 */ 1672 if (dentp->deName[0] == SLOT_EMPTY) { 1673 brelse(bp); 1674 goto out; 1675 } 1676 /* 1677 * Skip deleted entries. 1678 */ 1679 if (dentp->deName[0] == SLOT_DELETED) { 1680 chksum = -1; 1681 mbnambuf_init(&nb); 1682 continue; 1683 } 1684 1685 /* 1686 * Handle Win95 long directory entries 1687 */ 1688 if (dentp->deAttributes == ATTR_WIN95) { 1689 if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) 1690 continue; 1691 chksum = win2unixfn(&nb, 1692 (struct winentry *)dentp, chksum, pmp); 1693 continue; 1694 } 1695 1696 /* 1697 * Skip volume labels 1698 */ 1699 if (dentp->deAttributes & ATTR_VOLUME) { 1700 chksum = -1; 1701 mbnambuf_init(&nb); 1702 continue; 1703 } 1704 /* 1705 * This computation of d_fileno must match 1706 * the computation of va_fileid in 1707 * msdosfs_getattr. 1708 */ 1709 if (dentp->deAttributes & ATTR_DIRECTORY) { 1710 fileno = getushort(dentp->deStartCluster); 1711 if (FAT32(pmp)) 1712 fileno |= getushort(dentp->deHighClust) << 16; 1713 /* if this is the root directory */ 1714 if (fileno == MSDOSFSROOT) 1715 if (FAT32(pmp)) 1716 fileno = (uint64_t)cntobn(pmp, 1717 pmp->pm_rootdirblk) 1718 * dirsperblk; 1719 else 1720 fileno = 1; 1721 else 1722 fileno = (uint64_t)cntobn(pmp, fileno) * 1723 dirsperblk; 1724 dirbuf.d_type = DT_DIR; 1725 } else { 1726 fileno = (uoff_t)offset / 1727 sizeof(struct direntry); 1728 dirbuf.d_type = DT_REG; 1729 } 1730 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 1731 dirbuf.d_fileno = 1732 msdosfs_fileno_map(pmp->pm_mountp, fileno); 1733 } else 1734 dirbuf.d_fileno = (uint32_t)fileno; 1735 1736 if (chksum != winChksum(dentp)) { 1737 dirbuf.d_namlen = dos2unixfn(dentp->deName, 1738 (u_char *)dirbuf.d_name, 1739 dentp->deLowerCase | 1740 ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? 1741 (LCASE_BASE | LCASE_EXT) : 0), 1742 pmp); 1743 mbnambuf_init(&nb); 1744 } else 1745 mbnambuf_flush(&nb, &dirbuf); 1746 chksum = -1; 1747 dirbuf.d_reclen = GENERIC_DIRSIZ(&dirbuf); 1748 if (uio->uio_resid < dirbuf.d_reclen) { 1749 brelse(bp); 1750 goto out; 1751 } 1752 error = uiomove(&dirbuf, dirbuf.d_reclen, uio); 1753 if (error) { 1754 brelse(bp); 1755 goto out; 1756 } 1757 if (cookies) { 1758 *cookies++ = offset + sizeof(struct direntry); 1759 if (--ncookies <= 0) { 1760 brelse(bp); 1761 goto out; 1762 } 1763 } 1764 off = offset + sizeof(struct direntry); 1765 } 1766 brelse(bp); 1767 } 1768out: 1769 /* Subtract unused cookies */ 1770 if (ap->a_ncookies) 1771 *ap->a_ncookies -= ncookies; 1772 1773 uio->uio_offset = off; 1774 1775 /* 1776 * Set the eofflag (NFS uses it) 1777 */ 1778 if (ap->a_eofflag) { 1779 if (dep->de_FileSize - (offset - bias) <= 0) 1780 *ap->a_eofflag = 1; 1781 else 1782 *ap->a_eofflag = 0; 1783 } 1784 return (error); 1785} 1786 1787/*- 1788 * a_vp - pointer to the file's vnode 1789 * a_bn - logical block number within the file (cluster number for us) 1790 * a_bop - where to return the bufobj of the special file containing the fs 1791 * a_bnp - where to return the "physical" block number corresponding to a_bn 1792 * (relative to the special file; units are blocks of size DEV_BSIZE) 1793 * a_runp - where to return the "run past" a_bn. This is the count of logical 1794 * blocks whose physical blocks (together with a_bn's physical block) 1795 * are contiguous. 1796 * a_runb - where to return the "run before" a_bn. 1797 */ 1798static int 1799msdosfs_bmap(ap) 1800 struct vop_bmap_args /* { 1801 struct vnode *a_vp; 1802 daddr_t a_bn; 1803 struct bufobj **a_bop; 1804 daddr_t *a_bnp; 1805 int *a_runp; 1806 int *a_runb; 1807 } */ *ap; 1808{ 1809 struct denode *dep; 1810 struct mount *mp; 1811 struct msdosfsmount *pmp; 1812 struct vnode *vp; 1813 daddr_t runbn; 1814 u_long cn; 1815 int bnpercn, error, maxio, maxrun, run; 1816 1817 vp = ap->a_vp; 1818 dep = VTODE(vp); 1819 pmp = dep->de_pmp; 1820 if (ap->a_bop != NULL) 1821 *ap->a_bop = &pmp->pm_devvp->v_bufobj; 1822 if (ap->a_bnp == NULL) 1823 return (0); 1824 if (ap->a_runp != NULL) 1825 *ap->a_runp = 0; 1826 if (ap->a_runb != NULL) 1827 *ap->a_runb = 0; 1828 cn = ap->a_bn; 1829 if (cn != ap->a_bn) 1830 return (EFBIG); 1831 error = pcbmap(dep, cn, ap->a_bnp, NULL, NULL); 1832 if (error != 0 || (ap->a_runp == NULL && ap->a_runb == NULL)) 1833 return (error); 1834 1835 mp = vp->v_mount; 1836 maxio = mp->mnt_iosize_max / mp->mnt_stat.f_iosize; 1837 bnpercn = de_cn2bn(pmp, 1); 1838 if (ap->a_runp != NULL) { 1839 maxrun = ulmin(maxio - 1, pmp->pm_maxcluster - cn); 1840 for (run = 1; run <= maxrun; run++) { 1841 if (pcbmap(dep, cn + run, &runbn, NULL, NULL) != 0 || 1842 runbn != *ap->a_bnp + run * bnpercn) 1843 break; 1844 } 1845 *ap->a_runp = run - 1; 1846 } 1847 if (ap->a_runb != NULL) { 1848 maxrun = ulmin(maxio - 1, cn); 1849 for (run = 1; run < maxrun; run++) { 1850 if (pcbmap(dep, cn - run, &runbn, NULL, NULL) != 0 || 1851 runbn != *ap->a_bnp - run * bnpercn) 1852 break; 1853 } 1854 *ap->a_runb = run - 1; 1855 } 1856 return (0); 1857} 1858 1859static int 1860msdosfs_strategy(ap) 1861 struct vop_strategy_args /* { 1862 struct vnode *a_vp; 1863 struct buf *a_bp; 1864 } */ *ap; 1865{ 1866 struct buf *bp = ap->a_bp; 1867 struct denode *dep = VTODE(ap->a_vp); 1868 struct bufobj *bo; 1869 int error = 0; 1870 daddr_t blkno; 1871 1872 /* 1873 * If we don't already know the filesystem relative block number 1874 * then get it using pcbmap(). If pcbmap() returns the block 1875 * number as -1 then we've got a hole in the file. DOS filesystems 1876 * don't allow files with holes, so we shouldn't ever see this. 1877 */ 1878 if (bp->b_blkno == bp->b_lblkno) { 1879 error = pcbmap(dep, bp->b_lblkno, &blkno, 0, 0); 1880 bp->b_blkno = blkno; 1881 if (error) { 1882 bp->b_error = error; 1883 bp->b_ioflags |= BIO_ERROR; 1884 bufdone(bp); 1885 return (error); 1886 } 1887 if ((long)bp->b_blkno == -1) 1888 vfs_bio_clrbuf(bp); 1889 } 1890 if (bp->b_blkno == -1) { 1891 bufdone(bp); 1892 return (0); 1893 } 1894 /* 1895 * Read/write the block from/to the disk that contains the desired 1896 * file block. 1897 */ 1898 bp->b_iooffset = dbtob(bp->b_blkno); 1899 bo = dep->de_pmp->pm_bo; 1900 BO_STRATEGY(bo, bp); 1901 return (0); 1902} 1903 1904static int 1905msdosfs_print(ap) 1906 struct vop_print_args /* { 1907 struct vnode *vp; 1908 } */ *ap; 1909{ 1910 struct denode *dep = VTODE(ap->a_vp); 1911 1912 printf("\tstartcluster %lu, dircluster %lu, diroffset %lu, ", 1913 dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); 1914 printf("on dev %s\n", devtoname(dep->de_dev)); 1915 return (0); 1916} 1917 1918static int 1919msdosfs_pathconf(ap) 1920 struct vop_pathconf_args /* { 1921 struct vnode *a_vp; 1922 int a_name; 1923 int *a_retval; 1924 } */ *ap; 1925{ 1926 struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; 1927 1928 switch (ap->a_name) { 1929 case _PC_LINK_MAX: 1930 *ap->a_retval = 1; 1931 return (0); 1932 case _PC_NAME_MAX: 1933 *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; 1934 return (0); 1935 case _PC_PATH_MAX: 1936 *ap->a_retval = PATH_MAX; 1937 return (0); 1938 case _PC_CHOWN_RESTRICTED: 1939 *ap->a_retval = 1; 1940 return (0); 1941 case _PC_NO_TRUNC: 1942 *ap->a_retval = 0; 1943 return (0); 1944 default: 1945 return (EINVAL); 1946 } 1947 /* NOTREACHED */ 1948} 1949 1950static int 1951msdosfs_advlock(ap) 1952 struct vop_advlock_args /* { 1953 struct vnode *a_vp; 1954 u_char a_id; 1955 int a_op; 1956 struct flock *a_fl; 1957 int a_flags; 1958 } */ *ap; 1959{ 1960 struct denode *dep = VTODE(ap->a_vp); 1961 1962 return (lf_advlock(ap, &dep->de_lockf, dep->de_FileSize)); 1963} 1964 1965static int 1966msdosfs_vptofh(ap) 1967 struct vop_vptofh_args /* { 1968 struct vnode *a_vp; 1969 struct fid *a_fhp; 1970 } */ *ap; 1971{ 1972 struct denode *dep; 1973 struct defid *defhp; 1974 1975 dep = VTODE(ap->a_vp); 1976 defhp = (struct defid *)ap->a_fhp; 1977 defhp->defid_len = sizeof(struct defid); 1978 defhp->defid_dirclust = dep->de_dirclust; 1979 defhp->defid_dirofs = dep->de_diroffset; 1980 /* defhp->defid_gen = dep->de_gen; */ 1981 return (0); 1982} 1983 1984/* Global vfs data structures for msdosfs */ 1985struct vop_vector msdosfs_vnodeops = { 1986 .vop_default = &default_vnodeops, 1987 1988 .vop_access = msdosfs_access, 1989 .vop_advlock = msdosfs_advlock, 1990 .vop_bmap = msdosfs_bmap, 1991 .vop_cachedlookup = msdosfs_lookup, 1992 .vop_open = msdosfs_open, 1993 .vop_close = msdosfs_close, 1994 .vop_create = msdosfs_create, 1995 .vop_fsync = msdosfs_fsync, 1996 .vop_getattr = msdosfs_getattr, 1997 .vop_inactive = msdosfs_inactive, 1998 .vop_link = msdosfs_link, 1999 .vop_lookup = vfs_cache_lookup, 2000 .vop_mkdir = msdosfs_mkdir, 2001 .vop_mknod = msdosfs_mknod, 2002 .vop_pathconf = msdosfs_pathconf, 2003 .vop_print = msdosfs_print, 2004 .vop_read = msdosfs_read, 2005 .vop_readdir = msdosfs_readdir, 2006 .vop_reclaim = msdosfs_reclaim, 2007 .vop_remove = msdosfs_remove, 2008 .vop_rename = msdosfs_rename, 2009 .vop_rmdir = msdosfs_rmdir, 2010 .vop_setattr = msdosfs_setattr, 2011 .vop_strategy = msdosfs_strategy, 2012 .vop_symlink = msdosfs_symlink, 2013 .vop_write = msdosfs_write, 2014 .vop_vptofh = msdosfs_vptofh, 2015}; 2016