| 1 | /* $NetBSD: msdosfs_vnops.c,v 1.96 2016/02/01 16:53:23 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. |
| 5 | * Copyright (C) 1994, 1995, 1997 TooLs GmbH. |
| 6 | * All rights reserved. |
| 7 | * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed by TooLs GmbH. |
| 20 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
| 21 | * derived from this software without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
| 24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 26 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 27 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 28 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 29 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 31 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 32 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | */ |
| 34 | /* |
| 35 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
| 36 | * |
| 37 | * You can do anything you want with this software, just don't say you wrote |
| 38 | * it, and don't remove this notice. |
| 39 | * |
| 40 | * This software is provided "as is". |
| 41 | * |
| 42 | * The author supplies this software to be publicly redistributed on the |
| 43 | * understanding that the author is not responsible for the correct |
| 44 | * functioning of this software in any circumstances and is not liable for |
| 45 | * any damages caused by this software. |
| 46 | * |
| 47 | * October 1992 |
| 48 | */ |
| 49 | |
| 50 | #include <sys/cdefs.h> |
| 51 | __KERNEL_RCSID(0, "$NetBSD: msdosfs_vnops.c,v 1.96 2016/02/01 16:53:23 christos Exp $" ); |
| 52 | |
| 53 | #include <sys/param.h> |
| 54 | #include <sys/systm.h> |
| 55 | #include <sys/namei.h> |
| 56 | #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ |
| 57 | #include <sys/kernel.h> |
| 58 | #include <sys/file.h> /* define FWRITE ... */ |
| 59 | #include <sys/stat.h> |
| 60 | #include <sys/buf.h> |
| 61 | #include <sys/proc.h> |
| 62 | #include <sys/mount.h> |
| 63 | #include <sys/fstrans.h> |
| 64 | #include <sys/vnode.h> |
| 65 | #include <sys/signalvar.h> |
| 66 | #include <sys/malloc.h> |
| 67 | #include <sys/dirent.h> |
| 68 | #include <sys/lockf.h> |
| 69 | #include <sys/kauth.h> |
| 70 | |
| 71 | #include <miscfs/genfs/genfs.h> |
| 72 | #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ |
| 73 | |
| 74 | #include <uvm/uvm_extern.h> |
| 75 | |
| 76 | #include <fs/msdosfs/bpb.h> |
| 77 | #include <fs/msdosfs/direntry.h> |
| 78 | #include <fs/msdosfs/denode.h> |
| 79 | #include <fs/msdosfs/msdosfsmount.h> |
| 80 | #include <fs/msdosfs/fat.h> |
| 81 | |
| 82 | /* |
| 83 | * Some general notes: |
| 84 | * |
| 85 | * In the ufs filesystem the inodes, superblocks, and indirect blocks are |
| 86 | * read/written using the vnode for the filesystem. Blocks that represent |
| 87 | * the contents of a file are read/written using the vnode for the file |
| 88 | * (including directories when they are read/written as files). This |
| 89 | * presents problems for the dos filesystem because data that should be in |
| 90 | * an inode (if dos had them) resides in the directory itself. Since we |
| 91 | * must update directory entries without the benefit of having the vnode |
| 92 | * for the directory we must use the vnode for the filesystem. This means |
| 93 | * that when a directory is actually read/written (via read, write, or |
| 94 | * readdir, or seek) we must use the vnode for the filesystem instead of |
| 95 | * the vnode for the directory as would happen in ufs. This is to insure we |
| 96 | * retrieve the correct block from the buffer cache since the hash value is |
| 97 | * based upon the vnode address and the desired block number. |
| 98 | */ |
| 99 | |
| 100 | /* |
| 101 | * Create a regular file. On entry the directory to contain the file being |
| 102 | * created is locked. We must release before we return. |
| 103 | */ |
| 104 | int |
| 105 | msdosfs_create(void *v) |
| 106 | { |
| 107 | struct vop_create_v3_args /* { |
| 108 | struct vnode *a_dvp; |
| 109 | struct vnode **a_vpp; |
| 110 | struct componentname *a_cnp; |
| 111 | struct vattr *a_vap; |
| 112 | } */ *ap = v; |
| 113 | struct componentname *cnp = ap->a_cnp; |
| 114 | struct denode ndirent; |
| 115 | struct denode *dep; |
| 116 | struct denode *pdep = VTODE(ap->a_dvp); |
| 117 | int error; |
| 118 | |
| 119 | #ifdef MSDOSFS_DEBUG |
| 120 | printf("msdosfs_create(cnp %p, vap %p\n" , cnp, ap->a_vap); |
| 121 | #endif |
| 122 | |
| 123 | fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); |
| 124 | /* |
| 125 | * If this is the root directory and there is no space left we |
| 126 | * can't do anything. This is because the root directory can not |
| 127 | * change size. |
| 128 | */ |
| 129 | if (pdep->de_StartCluster == MSDOSFSROOT |
| 130 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
| 131 | error = ENOSPC; |
| 132 | goto bad; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Create a directory entry for the file, then call createde() to |
| 137 | * have it installed. NOTE: DOS files are always executable. We |
| 138 | * use the absence of the owner write bit to make the file |
| 139 | * readonly. |
| 140 | */ |
| 141 | memset(&ndirent, 0, sizeof(ndirent)); |
| 142 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
| 143 | goto bad; |
| 144 | |
| 145 | ndirent.de_Attributes = (ap->a_vap->va_mode & S_IWUSR) ? |
| 146 | ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; |
| 147 | ndirent.de_StartCluster = 0; |
| 148 | ndirent.de_FileSize = 0; |
| 149 | ndirent.de_dev = pdep->de_dev; |
| 150 | ndirent.de_devvp = pdep->de_devvp; |
| 151 | ndirent.de_pmp = pdep->de_pmp; |
| 152 | ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; |
| 153 | DETIMES(&ndirent, NULL, NULL, NULL, pdep->de_pmp->pm_gmtoff); |
| 154 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
| 155 | goto bad; |
| 156 | fstrans_done(ap->a_dvp->v_mount); |
| 157 | VN_KNOTE(ap->a_dvp, NOTE_WRITE); |
| 158 | *ap->a_vpp = DETOV(dep); |
| 159 | return (0); |
| 160 | |
| 161 | bad: |
| 162 | fstrans_done(ap->a_dvp->v_mount); |
| 163 | return (error); |
| 164 | } |
| 165 | |
| 166 | int |
| 167 | msdosfs_close(void *v) |
| 168 | { |
| 169 | struct vop_close_args /* { |
| 170 | struct vnode *a_vp; |
| 171 | int a_fflag; |
| 172 | kauth_cred_t a_cred; |
| 173 | } */ *ap = v; |
| 174 | struct vnode *vp = ap->a_vp; |
| 175 | struct denode *dep = VTODE(vp); |
| 176 | |
| 177 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
| 178 | mutex_enter(vp->v_interlock); |
| 179 | if (vp->v_usecount > 1) |
| 180 | DETIMES(dep, NULL, NULL, NULL, dep->de_pmp->pm_gmtoff); |
| 181 | mutex_exit(vp->v_interlock); |
| 182 | fstrans_done(vp->v_mount); |
| 183 | return (0); |
| 184 | } |
| 185 | |
| 186 | static int |
| 187 | msdosfs_check_possible(struct vnode *vp, struct denode *dep, mode_t mode) |
| 188 | { |
| 189 | |
| 190 | /* |
| 191 | * Disallow write attempts on read-only file systems; |
| 192 | * unless the file is a socket, fifo, or a block or |
| 193 | * character device resident on the file system. |
| 194 | */ |
| 195 | if (mode & VWRITE) { |
| 196 | switch (vp->v_type) { |
| 197 | case VDIR: |
| 198 | case VLNK: |
| 199 | case VREG: |
| 200 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 201 | return (EROFS); |
| 202 | default: |
| 203 | break; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static int |
| 211 | msdosfs_check_permitted(struct vnode *vp, struct denode *dep, mode_t mode, |
| 212 | kauth_cred_t cred) |
| 213 | { |
| 214 | struct msdosfsmount *pmp = dep->de_pmp; |
| 215 | mode_t file_mode; |
| 216 | |
| 217 | if ((dep->de_Attributes & ATTR_READONLY) == 0) |
| 218 | file_mode = S_IRWXU|S_IRWXG|S_IRWXO; |
| 219 | else |
| 220 | file_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
| 221 | |
| 222 | file_mode &= (vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); |
| 223 | |
| 224 | return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, |
| 225 | vp->v_type, file_mode), vp, NULL, genfs_can_access(vp->v_type, |
| 226 | file_mode, pmp->pm_uid, pmp->pm_gid, mode, cred)); |
| 227 | } |
| 228 | |
| 229 | int |
| 230 | msdosfs_access(void *v) |
| 231 | { |
| 232 | struct vop_access_args /* { |
| 233 | struct vnode *a_vp; |
| 234 | int a_mode; |
| 235 | kauth_cred_t a_cred; |
| 236 | } */ *ap = v; |
| 237 | struct vnode *vp = ap->a_vp; |
| 238 | struct denode *dep = VTODE(vp); |
| 239 | int error; |
| 240 | |
| 241 | error = msdosfs_check_possible(vp, dep, ap->a_mode); |
| 242 | if (error) |
| 243 | return error; |
| 244 | |
| 245 | error = msdosfs_check_permitted(vp, dep, ap->a_mode, ap->a_cred); |
| 246 | |
| 247 | return error; |
| 248 | } |
| 249 | |
| 250 | int |
| 251 | msdosfs_getattr(void *v) |
| 252 | { |
| 253 | struct vop_getattr_args /* { |
| 254 | struct vnode *a_vp; |
| 255 | struct vattr *a_vap; |
| 256 | kauth_cred_t a_cred; |
| 257 | } */ *ap = v; |
| 258 | struct denode *dep = VTODE(ap->a_vp); |
| 259 | struct msdosfsmount *pmp = dep->de_pmp; |
| 260 | struct vattr *vap = ap->a_vap; |
| 261 | mode_t mode; |
| 262 | u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); |
| 263 | ino_t fileid; |
| 264 | |
| 265 | fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED); |
| 266 | DETIMES(dep, NULL, NULL, NULL, pmp->pm_gmtoff); |
| 267 | vap->va_fsid = dep->de_dev; |
| 268 | /* |
| 269 | * The following computation of the fileid must be the same as that |
| 270 | * used in msdosfs_readdir() to compute d_fileno. If not, pwd |
| 271 | * doesn't work. |
| 272 | */ |
| 273 | if (dep->de_Attributes & ATTR_DIRECTORY) { |
| 274 | fileid = cntobn(pmp, (ino_t)dep->de_StartCluster) * dirsperblk; |
| 275 | if (dep->de_StartCluster == MSDOSFSROOT) |
| 276 | fileid = 1; |
| 277 | } else { |
| 278 | fileid = cntobn(pmp, (ino_t)dep->de_dirclust) * dirsperblk; |
| 279 | if (dep->de_dirclust == MSDOSFSROOT) |
| 280 | fileid = roottobn(pmp, 0) * dirsperblk; |
| 281 | fileid += dep->de_diroffset / sizeof(struct direntry); |
| 282 | } |
| 283 | vap->va_fileid = fileid; |
| 284 | if ((dep->de_Attributes & ATTR_READONLY) == 0) |
| 285 | mode = S_IRWXU|S_IRWXG|S_IRWXO; |
| 286 | else |
| 287 | mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
| 288 | vap->va_mode = |
| 289 | mode & (ap->a_vp->v_type == VDIR ? pmp->pm_dirmask : pmp->pm_mask); |
| 290 | vap->va_uid = pmp->pm_uid; |
| 291 | vap->va_gid = pmp->pm_gid; |
| 292 | vap->va_nlink = 1; |
| 293 | vap->va_rdev = 0; |
| 294 | vap->va_size = ap->a_vp->v_size; |
| 295 | dos2unixtime(dep->de_MDate, dep->de_MTime, 0, pmp->pm_gmtoff, |
| 296 | &vap->va_mtime); |
| 297 | if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { |
| 298 | dos2unixtime(dep->de_ADate, 0, 0, pmp->pm_gmtoff, |
| 299 | &vap->va_atime); |
| 300 | dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, |
| 301 | pmp->pm_gmtoff, &vap->va_ctime); |
| 302 | } else { |
| 303 | vap->va_atime = vap->va_mtime; |
| 304 | vap->va_ctime = vap->va_mtime; |
| 305 | } |
| 306 | vap->va_flags = 0; |
| 307 | if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) { |
| 308 | vap->va_flags |= SF_ARCHIVED; |
| 309 | vap->va_mode |= S_ARCH1; |
| 310 | } |
| 311 | vap->va_gen = 0; |
| 312 | vap->va_blocksize = pmp->pm_bpcluster; |
| 313 | vap->va_bytes = |
| 314 | (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; |
| 315 | vap->va_type = ap->a_vp->v_type; |
| 316 | fstrans_done(ap->a_vp->v_mount); |
| 317 | return (0); |
| 318 | } |
| 319 | |
| 320 | int |
| 321 | msdosfs_setattr(void *v) |
| 322 | { |
| 323 | struct vop_setattr_args /* { |
| 324 | struct vnode *a_vp; |
| 325 | struct vattr *a_vap; |
| 326 | kauth_cred_t a_cred; |
| 327 | } */ *ap = v; |
| 328 | int error = 0, de_changed = 0; |
| 329 | struct denode *dep = VTODE(ap->a_vp); |
| 330 | struct msdosfsmount *pmp = dep->de_pmp; |
| 331 | struct vnode *vp = ap->a_vp; |
| 332 | struct vattr *vap = ap->a_vap; |
| 333 | kauth_cred_t cred = ap->a_cred; |
| 334 | |
| 335 | #ifdef MSDOSFS_DEBUG |
| 336 | printf("msdosfs_setattr(): vp %p, vap %p, cred %p\n" , |
| 337 | ap->a_vp, vap, cred); |
| 338 | #endif |
| 339 | /* |
| 340 | * Note we silently ignore uid or gid changes. |
| 341 | */ |
| 342 | if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || |
| 343 | (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || |
| 344 | (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || |
| 345 | (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL) || |
| 346 | (vap->va_uid != VNOVAL && vap->va_uid != pmp->pm_uid) || |
| 347 | (vap->va_gid != VNOVAL && vap->va_gid != pmp->pm_gid)) { |
| 348 | #ifdef MSDOSFS_DEBUG |
| 349 | printf("msdosfs_setattr(): returning EINVAL\n" ); |
| 350 | printf(" va_type %d, va_nlink %x, va_fsid %" PRIx64", va_fileid %llx\n" , |
| 351 | vap->va_type, vap->va_nlink, vap->va_fsid, |
| 352 | (unsigned long long)vap->va_fileid); |
| 353 | printf(" va_blocksize %lx, va_rdev %" PRIx64", va_bytes %" PRIx64", va_gen %lx\n" , |
| 354 | vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen); |
| 355 | #endif |
| 356 | return (EINVAL); |
| 357 | } |
| 358 | /* |
| 359 | * Silently ignore attributes modifications on directories. |
| 360 | */ |
| 361 | if (ap->a_vp->v_type == VDIR) |
| 362 | return 0; |
| 363 | |
| 364 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
| 365 | if (vap->va_size != VNOVAL) { |
| 366 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
| 367 | error = EROFS; |
| 368 | goto bad; |
| 369 | } |
| 370 | error = detrunc(dep, (u_long)vap->va_size, 0, cred); |
| 371 | if (error) |
| 372 | goto bad; |
| 373 | de_changed = 1; |
| 374 | } |
| 375 | if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { |
| 376 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
| 377 | error = EROFS; |
| 378 | goto bad; |
| 379 | } |
| 380 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, |
| 381 | ap->a_vp, NULL, genfs_can_chtimes(ap->a_vp, vap->va_vaflags, |
| 382 | pmp->pm_uid, cred)); |
| 383 | if (error) |
| 384 | goto bad; |
| 385 | if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && |
| 386 | vap->va_atime.tv_sec != VNOVAL) |
| 387 | unix2dostime(&vap->va_atime, pmp->pm_gmtoff, &dep->de_ADate, NULL, NULL); |
| 388 | if (vap->va_mtime.tv_sec != VNOVAL) |
| 389 | unix2dostime(&vap->va_mtime, pmp->pm_gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); |
| 390 | dep->de_Attributes |= ATTR_ARCHIVE; |
| 391 | dep->de_flag |= DE_MODIFIED; |
| 392 | de_changed = 1; |
| 393 | } |
| 394 | /* |
| 395 | * DOS files only have the ability to have their writability |
| 396 | * attribute set, so we use the owner write bit to set the readonly |
| 397 | * attribute. |
| 398 | */ |
| 399 | if (vap->va_mode != (mode_t)VNOVAL) { |
| 400 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
| 401 | error = EROFS; |
| 402 | goto bad; |
| 403 | } |
| 404 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, |
| 405 | NULL, genfs_can_chflags(cred, vp->v_type, pmp->pm_uid, false)); |
| 406 | if (error) |
| 407 | goto bad; |
| 408 | /* We ignore the read and execute bits. */ |
| 409 | if (vap->va_mode & S_IWUSR) |
| 410 | dep->de_Attributes &= ~ATTR_READONLY; |
| 411 | else |
| 412 | dep->de_Attributes |= ATTR_READONLY; |
| 413 | dep->de_flag |= DE_MODIFIED; |
| 414 | de_changed = 1; |
| 415 | } |
| 416 | /* |
| 417 | * Allow the `archived' bit to be toggled. |
| 418 | */ |
| 419 | if (vap->va_flags != VNOVAL) { |
| 420 | if (vp->v_mount->mnt_flag & MNT_RDONLY) { |
| 421 | error = EROFS; |
| 422 | goto bad; |
| 423 | } |
| 424 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, |
| 425 | NULL, genfs_can_chflags(cred, vp->v_type, pmp->pm_uid, false)); |
| 426 | if (error) |
| 427 | goto bad; |
| 428 | if (vap->va_flags & SF_ARCHIVED) |
| 429 | dep->de_Attributes &= ~ATTR_ARCHIVE; |
| 430 | else |
| 431 | dep->de_Attributes |= ATTR_ARCHIVE; |
| 432 | dep->de_flag |= DE_MODIFIED; |
| 433 | de_changed = 1; |
| 434 | } |
| 435 | |
| 436 | if (de_changed) { |
| 437 | VN_KNOTE(vp, NOTE_ATTRIB); |
| 438 | error = deupdat(dep, 1); |
| 439 | if (error) |
| 440 | goto bad; |
| 441 | } |
| 442 | |
| 443 | bad: |
| 444 | fstrans_done(vp->v_mount); |
| 445 | return error; |
| 446 | } |
| 447 | |
| 448 | int |
| 449 | msdosfs_read(void *v) |
| 450 | { |
| 451 | struct vop_read_args /* { |
| 452 | struct vnode *a_vp; |
| 453 | struct uio *a_uio; |
| 454 | int a_ioflag; |
| 455 | kauth_cred_t a_cred; |
| 456 | } */ *ap = v; |
| 457 | int error = 0; |
| 458 | int64_t diff; |
| 459 | int blsize; |
| 460 | long n; |
| 461 | long on; |
| 462 | daddr_t lbn; |
| 463 | vsize_t bytelen; |
| 464 | struct buf *bp; |
| 465 | struct vnode *vp = ap->a_vp; |
| 466 | struct denode *dep = VTODE(vp); |
| 467 | struct msdosfsmount *pmp = dep->de_pmp; |
| 468 | struct uio *uio = ap->a_uio; |
| 469 | |
| 470 | /* |
| 471 | * If they didn't ask for any data, then we are done. |
| 472 | */ |
| 473 | |
| 474 | if (uio->uio_resid == 0) |
| 475 | return (0); |
| 476 | if (uio->uio_offset < 0) |
| 477 | return (EINVAL); |
| 478 | if (uio->uio_offset >= dep->de_FileSize) |
| 479 | return (0); |
| 480 | |
| 481 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
| 482 | if (vp->v_type == VREG) { |
| 483 | const int advice = IO_ADV_DECODE(ap->a_ioflag); |
| 484 | |
| 485 | while (uio->uio_resid > 0) { |
| 486 | bytelen = MIN(dep->de_FileSize - uio->uio_offset, |
| 487 | uio->uio_resid); |
| 488 | |
| 489 | if (bytelen == 0) |
| 490 | break; |
| 491 | error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, |
| 492 | UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); |
| 493 | if (error) |
| 494 | break; |
| 495 | } |
| 496 | dep->de_flag |= DE_ACCESS; |
| 497 | goto out; |
| 498 | } |
| 499 | |
| 500 | /* this loop is only for directories now */ |
| 501 | do { |
| 502 | lbn = de_cluster(pmp, uio->uio_offset); |
| 503 | on = uio->uio_offset & pmp->pm_crbomask; |
| 504 | n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); |
| 505 | if (uio->uio_offset >= dep->de_FileSize) { |
| 506 | fstrans_done(vp->v_mount); |
| 507 | return (0); |
| 508 | } |
| 509 | /* file size (and hence diff) may be up to 4GB */ |
| 510 | diff = dep->de_FileSize - uio->uio_offset; |
| 511 | if (diff < n) |
| 512 | n = (long) diff; |
| 513 | |
| 514 | /* convert cluster # to sector # */ |
| 515 | error = pcbmap(dep, lbn, &lbn, 0, &blsize); |
| 516 | if (error) |
| 517 | goto bad; |
| 518 | |
| 519 | /* |
| 520 | * If we are operating on a directory file then be sure to |
| 521 | * do i/o with the vnode for the filesystem instead of the |
| 522 | * vnode for the directory. |
| 523 | */ |
| 524 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, lbn), blsize, |
| 525 | 0, &bp); |
| 526 | if (error) { |
| 527 | goto bad; |
| 528 | } |
| 529 | n = MIN(n, pmp->pm_bpcluster - bp->b_resid); |
| 530 | error = uiomove((char *)bp->b_data + on, (int) n, uio); |
| 531 | brelse(bp, 0); |
| 532 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
| 533 | |
| 534 | out: |
| 535 | if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) { |
| 536 | int uerror; |
| 537 | |
| 538 | uerror = deupdat(dep, 1); |
| 539 | if (error == 0) |
| 540 | error = uerror; |
| 541 | } |
| 542 | bad: |
| 543 | fstrans_done(vp->v_mount); |
| 544 | return (error); |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * Write data to a file or directory. |
| 549 | */ |
| 550 | int |
| 551 | msdosfs_write(void *v) |
| 552 | { |
| 553 | struct vop_write_args /* { |
| 554 | struct vnode *a_vp; |
| 555 | struct uio *a_uio; |
| 556 | int a_ioflag; |
| 557 | kauth_cred_t a_cred; |
| 558 | } */ *ap = v; |
| 559 | int resid, extended = 0; |
| 560 | int error = 0; |
| 561 | int ioflag = ap->a_ioflag; |
| 562 | u_long osize; |
| 563 | u_long count; |
| 564 | vsize_t bytelen; |
| 565 | off_t oldoff; |
| 566 | size_t rem; |
| 567 | struct uio *uio = ap->a_uio; |
| 568 | struct vnode *vp = ap->a_vp; |
| 569 | struct denode *dep = VTODE(vp); |
| 570 | struct msdosfsmount *pmp = dep->de_pmp; |
| 571 | kauth_cred_t cred = ap->a_cred; |
| 572 | bool async; |
| 573 | |
| 574 | #ifdef MSDOSFS_DEBUG |
| 575 | printf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n" , |
| 576 | vp, uio, ioflag, cred); |
| 577 | printf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n" , |
| 578 | dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); |
| 579 | #endif |
| 580 | |
| 581 | switch (vp->v_type) { |
| 582 | case VREG: |
| 583 | if (ioflag & IO_APPEND) |
| 584 | uio->uio_offset = dep->de_FileSize; |
| 585 | break; |
| 586 | case VDIR: |
| 587 | return EISDIR; |
| 588 | default: |
| 589 | panic("msdosfs_write(): bad file type" ); |
| 590 | } |
| 591 | |
| 592 | if (uio->uio_offset < 0) |
| 593 | return (EINVAL); |
| 594 | |
| 595 | if (uio->uio_resid == 0) |
| 596 | return (0); |
| 597 | |
| 598 | /* Don't bother to try to write files larger than the fs limit */ |
| 599 | if (uio->uio_offset + uio->uio_resid > MSDOSFS_FILESIZE_MAX) |
| 600 | return (EFBIG); |
| 601 | |
| 602 | fstrans_start(vp->v_mount, FSTRANS_SHARED); |
| 603 | /* |
| 604 | * If the offset we are starting the write at is beyond the end of |
| 605 | * the file, then they've done a seek. Unix filesystems allow |
| 606 | * files with holes in them, DOS doesn't so we must fill the hole |
| 607 | * with zeroed blocks. |
| 608 | */ |
| 609 | if (uio->uio_offset > dep->de_FileSize) { |
| 610 | if ((error = deextend(dep, uio->uio_offset, cred)) != 0) { |
| 611 | fstrans_done(vp->v_mount); |
| 612 | return (error); |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * Remember some values in case the write fails. |
| 618 | */ |
| 619 | async = vp->v_mount->mnt_flag & MNT_ASYNC; |
| 620 | resid = uio->uio_resid; |
| 621 | osize = dep->de_FileSize; |
| 622 | |
| 623 | /* |
| 624 | * If we write beyond the end of the file, extend it to its ultimate |
| 625 | * size ahead of the time to hopefully get a contiguous area. |
| 626 | */ |
| 627 | if (uio->uio_offset + resid > osize) { |
| 628 | count = de_clcount(pmp, uio->uio_offset + resid) - |
| 629 | de_clcount(pmp, osize); |
| 630 | if ((error = extendfile(dep, count, NULL, NULL, 0))) |
| 631 | goto errexit; |
| 632 | |
| 633 | dep->de_FileSize = uio->uio_offset + resid; |
| 634 | /* hint uvm to not read in extended part */ |
| 635 | uvm_vnp_setwritesize(vp, dep->de_FileSize); |
| 636 | /* zero out the remainder of the last page */ |
| 637 | rem = round_page(dep->de_FileSize) - dep->de_FileSize; |
| 638 | if (rem > 0) |
| 639 | ubc_zerorange(&vp->v_uobj, (off_t)dep->de_FileSize, |
| 640 | rem, UBC_UNMAP_FLAG(vp)); |
| 641 | extended = 1; |
| 642 | } |
| 643 | |
| 644 | do { |
| 645 | oldoff = uio->uio_offset; |
| 646 | bytelen = uio->uio_resid; |
| 647 | |
| 648 | error = ubc_uiomove(&vp->v_uobj, uio, bytelen, |
| 649 | IO_ADV_DECODE(ioflag), UBC_WRITE | UBC_UNMAP_FLAG(vp)); |
| 650 | if (error) |
| 651 | break; |
| 652 | |
| 653 | /* |
| 654 | * flush what we just wrote if necessary. |
| 655 | * XXXUBC simplistic async flushing. |
| 656 | */ |
| 657 | |
| 658 | if (!async && oldoff >> 16 != uio->uio_offset >> 16) { |
| 659 | mutex_enter(vp->v_interlock); |
| 660 | error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, |
| 661 | (uio->uio_offset >> 16) << 16, |
| 662 | PGO_CLEANIT | PGO_LAZY); |
| 663 | } |
| 664 | } while (error == 0 && uio->uio_resid > 0); |
| 665 | |
| 666 | /* set final size */ |
| 667 | uvm_vnp_setsize(vp, dep->de_FileSize); |
| 668 | if (error == 0 && ioflag & IO_SYNC) { |
| 669 | mutex_enter(vp->v_interlock); |
| 670 | error = VOP_PUTPAGES(vp, trunc_page(oldoff), |
| 671 | round_page(oldoff + bytelen), PGO_CLEANIT | PGO_SYNCIO); |
| 672 | } |
| 673 | dep->de_flag |= DE_UPDATE; |
| 674 | |
| 675 | /* |
| 676 | * If the write failed and they want us to, truncate the file back |
| 677 | * to the size it was before the write was attempted. |
| 678 | */ |
| 679 | errexit: |
| 680 | if (resid > uio->uio_resid) |
| 681 | VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); |
| 682 | if (error) { |
| 683 | detrunc(dep, osize, ioflag & IO_SYNC, NOCRED); |
| 684 | uio->uio_offset -= resid - uio->uio_resid; |
| 685 | uio->uio_resid = resid; |
| 686 | } else if ((ioflag & IO_SYNC) == IO_SYNC) |
| 687 | error = deupdat(dep, 1); |
| 688 | fstrans_done(vp->v_mount); |
| 689 | KASSERT(vp->v_size == dep->de_FileSize); |
| 690 | return (error); |
| 691 | } |
| 692 | |
| 693 | int |
| 694 | msdosfs_update(struct vnode *vp, const struct timespec *acc, |
| 695 | const struct timespec *mod, int flags) |
| 696 | { |
| 697 | struct buf *bp; |
| 698 | struct direntry *dirp; |
| 699 | struct denode *dep; |
| 700 | int error; |
| 701 | |
| 702 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 703 | return (0); |
| 704 | dep = VTODE(vp); |
| 705 | DETIMES(dep, acc, mod, NULL, dep->de_pmp->pm_gmtoff); |
| 706 | if ((dep->de_flag & DE_MODIFIED) == 0) |
| 707 | return (0); |
| 708 | dep->de_flag &= ~DE_MODIFIED; |
| 709 | if (dep->de_Attributes & ATTR_DIRECTORY) |
| 710 | return (0); |
| 711 | if (dep->de_refcnt <= 0) |
| 712 | return (0); |
| 713 | error = readde(dep, &bp, &dirp); |
| 714 | if (error) |
| 715 | return (error); |
| 716 | DE_EXTERNALIZE(dirp, dep); |
| 717 | if (flags & (UPDATE_WAIT|UPDATE_DIROP)) |
| 718 | return (bwrite(bp)); |
| 719 | else { |
| 720 | bdwrite(bp); |
| 721 | return (0); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Flush the blocks of a file to disk. |
| 727 | * |
| 728 | * This function is worthless for vnodes that represent directories. Maybe we |
| 729 | * could just do a sync if they try an fsync on a directory file. |
| 730 | */ |
| 731 | int |
| 732 | msdosfs_remove(void *v) |
| 733 | { |
| 734 | struct vop_remove_args /* { |
| 735 | struct vnode *a_dvp; |
| 736 | struct vnode *a_vp; |
| 737 | struct componentname *a_cnp; |
| 738 | } */ *ap = v; |
| 739 | struct denode *dep = VTODE(ap->a_vp); |
| 740 | struct denode *ddep = VTODE(ap->a_dvp); |
| 741 | int error; |
| 742 | |
| 743 | fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); |
| 744 | if (ap->a_vp->v_type == VDIR) |
| 745 | error = EPERM; |
| 746 | else |
| 747 | error = removede(ddep, dep); |
| 748 | #ifdef MSDOSFS_DEBUG |
| 749 | printf("msdosfs_remove(), dep %p, v_usecount %d\n" , |
| 750 | dep, ap->a_vp->v_usecount); |
| 751 | #endif |
| 752 | VN_KNOTE(ap->a_vp, NOTE_DELETE); |
| 753 | VN_KNOTE(ap->a_dvp, NOTE_WRITE); |
| 754 | if (ddep == dep) |
| 755 | vrele(ap->a_vp); |
| 756 | else |
| 757 | vput(ap->a_vp); /* causes msdosfs_inactive() to be called |
| 758 | * via vrele() */ |
| 759 | vput(ap->a_dvp); |
| 760 | fstrans_done(ap->a_dvp->v_mount); |
| 761 | return (error); |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * Renames on files require moving the denode to a new hash queue since the |
| 766 | * denode's location is used to compute which hash queue to put the file |
| 767 | * in. Unless it is a rename in place. For example "mv a b". |
| 768 | * |
| 769 | * What follows is the basic algorithm: |
| 770 | * |
| 771 | * if (file move) { |
| 772 | * if (dest file exists) { |
| 773 | * remove dest file |
| 774 | * } |
| 775 | * if (dest and src in same directory) { |
| 776 | * rewrite name in existing directory slot |
| 777 | * } else { |
| 778 | * write new entry in dest directory |
| 779 | * update offset and dirclust in denode |
| 780 | * move denode to new hash chain |
| 781 | * clear old directory entry |
| 782 | * } |
| 783 | * } else { |
| 784 | * directory move |
| 785 | * if (dest directory exists) { |
| 786 | * if (dest is not empty) { |
| 787 | * return ENOTEMPTY |
| 788 | * } |
| 789 | * remove dest directory |
| 790 | * } |
| 791 | * if (dest and src in same directory) { |
| 792 | * rewrite name in existing entry |
| 793 | * } else { |
| 794 | * be sure dest is not a child of src directory |
| 795 | * write entry in dest directory |
| 796 | * update "." and ".." in moved directory |
| 797 | * update offset and dirclust in denode |
| 798 | * move denode to new hash chain |
| 799 | * clear old directory entry for moved directory |
| 800 | * } |
| 801 | * } |
| 802 | * |
| 803 | * On entry: |
| 804 | * source's parent directory is unlocked |
| 805 | * source file or directory is unlocked |
| 806 | * destination's parent directory is locked |
| 807 | * destination file or directory is locked if it exists |
| 808 | * |
| 809 | * On exit: |
| 810 | * all denodes should be released |
| 811 | * |
| 812 | * Notes: |
| 813 | * I'm not sure how the memory containing the pathnames pointed at by the |
| 814 | * componentname structures is freed, there may be some memory bleeding |
| 815 | * for each rename done. |
| 816 | * |
| 817 | * --More-- Notes: |
| 818 | * This routine needs help. badly. |
| 819 | */ |
| 820 | int |
| 821 | msdosfs_rename(void *v) |
| 822 | { |
| 823 | struct vop_rename_args /* { |
| 824 | struct vnode *a_fdvp; |
| 825 | struct vnode *a_fvp; |
| 826 | struct componentname *a_fcnp; |
| 827 | struct vnode *a_tdvp; |
| 828 | struct vnode *a_tvp; |
| 829 | struct componentname *a_tcnp; |
| 830 | } */ *ap = v; |
| 831 | struct vnode *tvp = ap->a_tvp; |
| 832 | struct vnode *tdvp = ap->a_tdvp; |
| 833 | struct vnode *fvp = ap->a_fvp; |
| 834 | struct vnode *fdvp = ap->a_fdvp; |
| 835 | struct mount *mp = fdvp->v_mount; |
| 836 | struct componentname *tcnp = ap->a_tcnp; |
| 837 | struct componentname *fcnp = ap->a_fcnp; |
| 838 | struct denode *ip, *xp, *dp, *zp; |
| 839 | u_char toname[12], oldname[12]; |
| 840 | u_long from_diroffset, to_diroffset; |
| 841 | u_char to_count; |
| 842 | int doingdirectory = 0, newparent = 0; |
| 843 | int error; |
| 844 | u_long cn; |
| 845 | daddr_t bn; |
| 846 | struct msdosfsmount *pmp; |
| 847 | struct direntry *dotdotp; |
| 848 | struct buf *bp; |
| 849 | |
| 850 | pmp = VFSTOMSDOSFS(fdvp->v_mount); |
| 851 | |
| 852 | /* |
| 853 | * Check for cross-device rename. |
| 854 | */ |
| 855 | if ((fvp->v_mount != tdvp->v_mount) || |
| 856 | (tvp && (fvp->v_mount != tvp->v_mount))) { |
| 857 | error = EXDEV; |
| 858 | abortit: |
| 859 | VOP_ABORTOP(tdvp, tcnp); |
| 860 | if (tdvp == tvp) |
| 861 | vrele(tdvp); |
| 862 | else |
| 863 | vput(tdvp); |
| 864 | if (tvp) |
| 865 | vput(tvp); |
| 866 | VOP_ABORTOP(fdvp, fcnp); |
| 867 | vrele(fdvp); |
| 868 | vrele(fvp); |
| 869 | return (error); |
| 870 | } |
| 871 | |
| 872 | /* |
| 873 | * If source and dest are the same, do nothing. |
| 874 | */ |
| 875 | if (tvp == fvp) { |
| 876 | error = 0; |
| 877 | goto abortit; |
| 878 | } |
| 879 | |
| 880 | /* |
| 881 | * XXX: This can deadlock since we hold tdvp/tvp locked. |
| 882 | * But I'm not going to fix it now. |
| 883 | */ |
| 884 | if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) |
| 885 | goto abortit; |
| 886 | dp = VTODE(fdvp); |
| 887 | ip = VTODE(fvp); |
| 888 | |
| 889 | /* |
| 890 | * Be sure we are not renaming ".", "..", or an alias of ".". This |
| 891 | * leads to a crippled directory tree. It's pretty tough to do a |
| 892 | * "ls" or "pwd" with the "." directory entry missing, and "cd .." |
| 893 | * doesn't work if the ".." entry is missing. |
| 894 | */ |
| 895 | if (ip->de_Attributes & ATTR_DIRECTORY) { |
| 896 | /* |
| 897 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
| 898 | */ |
| 899 | if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || |
| 900 | dp == ip || |
| 901 | (fcnp->cn_flags & ISDOTDOT) || |
| 902 | (tcnp->cn_flags & ISDOTDOT) || |
| 903 | (ip->de_flag & DE_RENAME)) { |
| 904 | VOP_UNLOCK(fvp); |
| 905 | error = EINVAL; |
| 906 | goto abortit; |
| 907 | } |
| 908 | ip->de_flag |= DE_RENAME; |
| 909 | doingdirectory++; |
| 910 | } |
| 911 | VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ |
| 912 | |
| 913 | fstrans_start(mp, FSTRANS_SHARED); |
| 914 | /* |
| 915 | * When the target exists, both the directory |
| 916 | * and target vnodes are returned locked. |
| 917 | */ |
| 918 | dp = VTODE(tdvp); |
| 919 | xp = tvp ? VTODE(tvp) : NULL; |
| 920 | /* |
| 921 | * Remember direntry place to use for destination |
| 922 | */ |
| 923 | to_diroffset = dp->de_fndoffset; |
| 924 | to_count = dp->de_fndcnt; |
| 925 | |
| 926 | /* |
| 927 | * If ".." must be changed (ie the directory gets a new |
| 928 | * parent) then the source directory must not be in the |
| 929 | * directory hierarchy above the target, as this would |
| 930 | * orphan everything below the source directory. Also |
| 931 | * the user must have write permission in the source so |
| 932 | * as to be able to change "..". We must repeat the call |
| 933 | * to namei, as the parent directory is unlocked by the |
| 934 | * call to doscheckpath(). |
| 935 | */ |
| 936 | error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); |
| 937 | VOP_UNLOCK(fvp); |
| 938 | if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) |
| 939 | newparent = 1; |
| 940 | |
| 941 | if (doingdirectory && newparent) { |
| 942 | if (error) /* write access check above */ |
| 943 | goto tdvpbad; |
| 944 | if (xp != NULL) |
| 945 | vput(tvp); |
| 946 | tvp = NULL; |
| 947 | /* |
| 948 | * doscheckpath() vput()'s tdvp (dp == VTODE(tdvp)), |
| 949 | * so we have to get an extra ref to it first, and |
| 950 | * because it's been unlocked we need to do a relookup |
| 951 | * afterwards in case tvp has changed. |
| 952 | */ |
| 953 | vref(tdvp); |
| 954 | if ((error = doscheckpath(ip, dp)) != 0) |
| 955 | goto bad; |
| 956 | vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); |
| 957 | if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { |
| 958 | VOP_UNLOCK(tdvp); |
| 959 | goto bad; |
| 960 | } |
| 961 | dp = VTODE(tdvp); |
| 962 | xp = tvp ? VTODE(tvp) : NULL; |
| 963 | } |
| 964 | |
| 965 | if (xp != NULL) { |
| 966 | /* |
| 967 | * Target must be empty if a directory and have no links |
| 968 | * to it. Also, ensure source and target are compatible |
| 969 | * (both directories, or both not directories). |
| 970 | */ |
| 971 | if (xp->de_Attributes & ATTR_DIRECTORY) { |
| 972 | if (!dosdirempty(xp)) { |
| 973 | error = ENOTEMPTY; |
| 974 | goto tdvpbad; |
| 975 | } |
| 976 | if (!doingdirectory) { |
| 977 | error = ENOTDIR; |
| 978 | goto tdvpbad; |
| 979 | } |
| 980 | } else if (doingdirectory) { |
| 981 | error = EISDIR; |
| 982 | goto tdvpbad; |
| 983 | } |
| 984 | if ((error = removede(dp, xp)) != 0) |
| 985 | goto tdvpbad; |
| 986 | VN_KNOTE(tdvp, NOTE_WRITE); |
| 987 | VN_KNOTE(tvp, NOTE_DELETE); |
| 988 | cache_purge(tvp); |
| 989 | vput(tvp); |
| 990 | tvp = NULL; |
| 991 | xp = NULL; |
| 992 | } |
| 993 | |
| 994 | /* |
| 995 | * Convert the filename in tcnp into a dos filename. We copy this |
| 996 | * into the denode and directory entry for the destination |
| 997 | * file/directory. |
| 998 | */ |
| 999 | if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) { |
| 1000 | fstrans_done(mp); |
| 1001 | goto abortit; |
| 1002 | } |
| 1003 | |
| 1004 | /* |
| 1005 | * Since from wasn't locked at various places above, |
| 1006 | * have to do a relookup here. |
| 1007 | */ |
| 1008 | fcnp->cn_flags &= ~MODMASK; |
| 1009 | fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; |
| 1010 | VOP_UNLOCK(tdvp); |
| 1011 | vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); |
| 1012 | if ((error = relookup(fdvp, &fvp, fcnp, 0))) { |
| 1013 | VOP_UNLOCK(fdvp); |
| 1014 | vrele(ap->a_fvp); |
| 1015 | vrele(tdvp); |
| 1016 | fstrans_done(mp); |
| 1017 | return (error); |
| 1018 | } |
| 1019 | if (fvp == NULL) { |
| 1020 | /* |
| 1021 | * From name has disappeared. |
| 1022 | */ |
| 1023 | if (doingdirectory) |
| 1024 | panic("rename: lost dir entry" ); |
| 1025 | vput(fdvp); |
| 1026 | vrele(ap->a_fvp); |
| 1027 | vrele(tdvp); |
| 1028 | fstrans_done(mp); |
| 1029 | return 0; |
| 1030 | } |
| 1031 | VOP_UNLOCK(fdvp); |
| 1032 | xp = VTODE(fvp); |
| 1033 | zp = VTODE(fdvp); |
| 1034 | from_diroffset = zp->de_fndoffset; |
| 1035 | |
| 1036 | /* |
| 1037 | * Ensure that the directory entry still exists and has not |
| 1038 | * changed till now. If the source is a file the entry may |
| 1039 | * have been unlinked or renamed. In either case there is |
| 1040 | * no further work to be done. If the source is a directory |
| 1041 | * then it cannot have been rmdir'ed or renamed; this is |
| 1042 | * prohibited by the DE_RENAME flag. |
| 1043 | */ |
| 1044 | if (xp != ip) { |
| 1045 | if (doingdirectory) |
| 1046 | panic("rename: lost dir entry" ); |
| 1047 | vrele(ap->a_fvp); |
| 1048 | xp = NULL; |
| 1049 | } else { |
| 1050 | vrele(fvp); |
| 1051 | xp = NULL; |
| 1052 | |
| 1053 | /* |
| 1054 | * First write a new entry in the destination |
| 1055 | * directory and mark the entry in the source directory |
| 1056 | * as deleted. Then move the denode to the correct hash |
| 1057 | * chain for its new location in the filesystem. And, if |
| 1058 | * we moved a directory, then update its .. entry to point |
| 1059 | * to the new parent directory. |
| 1060 | */ |
| 1061 | memcpy(oldname, ip->de_Name, 11); |
| 1062 | memcpy(ip->de_Name, toname, 11); /* update denode */ |
| 1063 | dp->de_fndoffset = to_diroffset; |
| 1064 | dp->de_fndcnt = to_count; |
| 1065 | error = createde(ip, dp, (struct denode **)0, tcnp); |
| 1066 | if (error) { |
| 1067 | memcpy(ip->de_Name, oldname, 11); |
| 1068 | VOP_UNLOCK(fvp); |
| 1069 | goto bad; |
| 1070 | } |
| 1071 | ip->de_refcnt++; |
| 1072 | zp->de_fndoffset = from_diroffset; |
| 1073 | if ((error = removede(zp, ip)) != 0) { |
| 1074 | /* XXX should really panic here, fs is corrupt */ |
| 1075 | VOP_UNLOCK(fvp); |
| 1076 | goto bad; |
| 1077 | } |
| 1078 | cache_purge(fvp); |
| 1079 | if (!doingdirectory) { |
| 1080 | struct denode_key old_key = ip->de_key; |
| 1081 | struct denode_key new_key = ip->de_key; |
| 1082 | |
| 1083 | error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, |
| 1084 | &new_key.dk_dirclust, 0); |
| 1085 | if (error) { |
| 1086 | /* XXX should really panic here, fs is corrupt */ |
| 1087 | VOP_UNLOCK(fvp); |
| 1088 | goto bad; |
| 1089 | } |
| 1090 | new_key.dk_diroffset = to_diroffset; |
| 1091 | if (new_key.dk_dirclust != MSDOSFSROOT) |
| 1092 | new_key.dk_diroffset &= pmp->pm_crbomask; |
| 1093 | vcache_rekey_enter(pmp->pm_mountp, fvp, &old_key, |
| 1094 | sizeof(old_key), &new_key, sizeof(new_key)); |
| 1095 | ip->de_key = new_key; |
| 1096 | vcache_rekey_exit(pmp->pm_mountp, fvp, &old_key, |
| 1097 | sizeof(old_key), &ip->de_key, sizeof(ip->de_key)); |
| 1098 | } |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * If we moved a directory to a new parent directory, then we must |
| 1103 | * fixup the ".." entry in the moved directory. |
| 1104 | */ |
| 1105 | if (doingdirectory && newparent) { |
| 1106 | cn = ip->de_StartCluster; |
| 1107 | if (cn == MSDOSFSROOT) { |
| 1108 | /* this should never happen */ |
| 1109 | panic("msdosfs_rename: updating .. in root directory?" ); |
| 1110 | } else |
| 1111 | bn = cntobn(pmp, cn); |
| 1112 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), |
| 1113 | pmp->pm_bpcluster, B_MODIFY, &bp); |
| 1114 | if (error) { |
| 1115 | /* XXX should really panic here, fs is corrupt */ |
| 1116 | VOP_UNLOCK(fvp); |
| 1117 | goto bad; |
| 1118 | } |
| 1119 | dotdotp = (struct direntry *)bp->b_data + 1; |
| 1120 | putushort(dotdotp->deStartCluster, dp->de_StartCluster); |
| 1121 | if (FAT32(pmp)) { |
| 1122 | putushort(dotdotp->deHighClust, |
| 1123 | dp->de_StartCluster >> 16); |
| 1124 | } else { |
| 1125 | putushort(dotdotp->deHighClust, 0); |
| 1126 | } |
| 1127 | if ((error = bwrite(bp)) != 0) { |
| 1128 | /* XXX should really panic here, fs is corrupt */ |
| 1129 | VOP_UNLOCK(fvp); |
| 1130 | goto bad; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | VN_KNOTE(fvp, NOTE_RENAME); |
| 1135 | VOP_UNLOCK(fvp); |
| 1136 | bad: |
| 1137 | if (tvp) |
| 1138 | vput(tvp); |
| 1139 | vrele(tdvp); |
| 1140 | ip->de_flag &= ~DE_RENAME; |
| 1141 | vrele(fdvp); |
| 1142 | vrele(fvp); |
| 1143 | fstrans_done(mp); |
| 1144 | return (error); |
| 1145 | |
| 1146 | /* XXX: uuuh */ |
| 1147 | tdvpbad: |
| 1148 | VOP_UNLOCK(tdvp); |
| 1149 | goto bad; |
| 1150 | } |
| 1151 | |
| 1152 | static const struct { |
| 1153 | struct direntry dot; |
| 1154 | struct direntry dotdot; |
| 1155 | } dosdirtemplate = { |
| 1156 | { ". " , " " , /* the . entry */ |
| 1157 | ATTR_DIRECTORY, /* file attribute */ |
| 1158 | 0, /* reserved */ |
| 1159 | 0, { 0, 0 }, { 0, 0 }, /* create time & date */ |
| 1160 | { 0, 0 }, /* access date */ |
| 1161 | { 0, 0 }, /* high bits of start cluster */ |
| 1162 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
| 1163 | { 0, 0 }, /* startcluster */ |
| 1164 | { 0, 0, 0, 0 } /* filesize */ |
| 1165 | }, |
| 1166 | { ".. " , " " , /* the .. entry */ |
| 1167 | ATTR_DIRECTORY, /* file attribute */ |
| 1168 | 0, /* reserved */ |
| 1169 | 0, { 0, 0 }, { 0, 0 }, /* create time & date */ |
| 1170 | { 0, 0 }, /* access date */ |
| 1171 | { 0, 0 }, /* high bits of start cluster */ |
| 1172 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
| 1173 | { 0, 0 }, /* startcluster */ |
| 1174 | { 0, 0, 0, 0 } /* filesize */ |
| 1175 | } |
| 1176 | }; |
| 1177 | |
| 1178 | int |
| 1179 | msdosfs_mkdir(void *v) |
| 1180 | { |
| 1181 | struct vop_mkdir_v3_args /* { |
| 1182 | struct vnode *a_dvp; |
| 1183 | struvt vnode **a_vpp; |
| 1184 | struvt componentname *a_cnp; |
| 1185 | struct vattr *a_vap; |
| 1186 | } */ *ap = v; |
| 1187 | struct componentname *cnp = ap->a_cnp; |
| 1188 | struct denode ndirent; |
| 1189 | struct denode *dep; |
| 1190 | struct denode *pdep = VTODE(ap->a_dvp); |
| 1191 | int error; |
| 1192 | int bn; |
| 1193 | u_long newcluster, pcl; |
| 1194 | daddr_t lbn; |
| 1195 | struct direntry *denp; |
| 1196 | struct msdosfsmount *pmp = pdep->de_pmp; |
| 1197 | struct buf *bp; |
| 1198 | int async = pdep->de_pmp->pm_mountp->mnt_flag & MNT_ASYNC; |
| 1199 | |
| 1200 | fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED); |
| 1201 | /* |
| 1202 | * If this is the root directory and there is no space left we |
| 1203 | * can't do anything. This is because the root directory can not |
| 1204 | * change size. |
| 1205 | */ |
| 1206 | if (pdep->de_StartCluster == MSDOSFSROOT |
| 1207 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
| 1208 | error = ENOSPC; |
| 1209 | goto bad2; |
| 1210 | } |
| 1211 | |
| 1212 | /* |
| 1213 | * Allocate a cluster to hold the about to be created directory. |
| 1214 | */ |
| 1215 | error = clusteralloc(pmp, 0, 1, &newcluster, NULL); |
| 1216 | if (error) |
| 1217 | goto bad2; |
| 1218 | |
| 1219 | memset(&ndirent, 0, sizeof(ndirent)); |
| 1220 | ndirent.de_pmp = pmp; |
| 1221 | ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; |
| 1222 | DETIMES(&ndirent, NULL, NULL, NULL, pmp->pm_gmtoff); |
| 1223 | |
| 1224 | /* |
| 1225 | * Now fill the cluster with the "." and ".." entries. And write |
| 1226 | * the cluster to disk. This way it is there for the parent |
| 1227 | * directory to be pointing at if there were a crash. |
| 1228 | */ |
| 1229 | bn = cntobn(pmp, newcluster); |
| 1230 | lbn = de_bn2kb(pmp, bn); |
| 1231 | /* always succeeds */ |
| 1232 | bp = getblk(pmp->pm_devvp, lbn, pmp->pm_bpcluster, 0, 0); |
| 1233 | memset(bp->b_data, 0, pmp->pm_bpcluster); |
| 1234 | memcpy(bp->b_data, &dosdirtemplate, sizeof dosdirtemplate); |
| 1235 | denp = (struct direntry *)bp->b_data; |
| 1236 | putushort(denp[0].deStartCluster, newcluster); |
| 1237 | putushort(denp[0].deCDate, ndirent.de_CDate); |
| 1238 | putushort(denp[0].deCTime, ndirent.de_CTime); |
| 1239 | denp[0].deCHundredth = ndirent.de_CHun; |
| 1240 | putushort(denp[0].deADate, ndirent.de_ADate); |
| 1241 | putushort(denp[0].deMDate, ndirent.de_MDate); |
| 1242 | putushort(denp[0].deMTime, ndirent.de_MTime); |
| 1243 | pcl = pdep->de_StartCluster; |
| 1244 | if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) |
| 1245 | pcl = 0; |
| 1246 | putushort(denp[1].deStartCluster, pcl); |
| 1247 | putushort(denp[1].deCDate, ndirent.de_CDate); |
| 1248 | putushort(denp[1].deCTime, ndirent.de_CTime); |
| 1249 | denp[1].deCHundredth = ndirent.de_CHun; |
| 1250 | putushort(denp[1].deADate, ndirent.de_ADate); |
| 1251 | putushort(denp[1].deMDate, ndirent.de_MDate); |
| 1252 | putushort(denp[1].deMTime, ndirent.de_MTime); |
| 1253 | if (FAT32(pmp)) { |
| 1254 | putushort(denp[0].deHighClust, newcluster >> 16); |
| 1255 | putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); |
| 1256 | } else { |
| 1257 | putushort(denp[0].deHighClust, 0); |
| 1258 | putushort(denp[1].deHighClust, 0); |
| 1259 | } |
| 1260 | |
| 1261 | if (async) |
| 1262 | bdwrite(bp); |
| 1263 | else if ((error = bwrite(bp)) != 0) |
| 1264 | goto bad; |
| 1265 | |
| 1266 | /* |
| 1267 | * Now build up a directory entry pointing to the newly allocated |
| 1268 | * cluster. This will be written to an empty slot in the parent |
| 1269 | * directory. |
| 1270 | */ |
| 1271 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
| 1272 | goto bad; |
| 1273 | |
| 1274 | ndirent.de_Attributes = ATTR_DIRECTORY; |
| 1275 | ndirent.de_StartCluster = newcluster; |
| 1276 | ndirent.de_FileSize = 0; |
| 1277 | ndirent.de_dev = pdep->de_dev; |
| 1278 | ndirent.de_devvp = pdep->de_devvp; |
| 1279 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
| 1280 | goto bad; |
| 1281 | VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); |
| 1282 | *ap->a_vpp = DETOV(dep); |
| 1283 | fstrans_done(ap->a_dvp->v_mount); |
| 1284 | return (0); |
| 1285 | |
| 1286 | bad: |
| 1287 | clusterfree(pmp, newcluster, NULL); |
| 1288 | bad2: |
| 1289 | fstrans_done(ap->a_dvp->v_mount); |
| 1290 | return (error); |
| 1291 | } |
| 1292 | |
| 1293 | int |
| 1294 | msdosfs_rmdir(void *v) |
| 1295 | { |
| 1296 | struct vop_rmdir_args /* { |
| 1297 | struct vnode *a_dvp; |
| 1298 | struct vnode *a_vp; |
| 1299 | struct componentname *a_cnp; |
| 1300 | } */ *ap = v; |
| 1301 | struct vnode *vp = ap->a_vp; |
| 1302 | struct vnode *dvp = ap->a_dvp; |
| 1303 | struct mount *mp = dvp->v_mount; |
| 1304 | struct componentname *cnp = ap->a_cnp; |
| 1305 | struct denode *ip, *dp; |
| 1306 | int error; |
| 1307 | |
| 1308 | ip = VTODE(vp); |
| 1309 | dp = VTODE(dvp); |
| 1310 | /* |
| 1311 | * No rmdir "." please. |
| 1312 | */ |
| 1313 | if (dp == ip) { |
| 1314 | vrele(dvp); |
| 1315 | vput(vp); |
| 1316 | return (EINVAL); |
| 1317 | } |
| 1318 | fstrans_start(mp, FSTRANS_SHARED); |
| 1319 | /* |
| 1320 | * Verify the directory is empty (and valid). |
| 1321 | * (Rmdir ".." won't be valid since |
| 1322 | * ".." will contain a reference to |
| 1323 | * the current directory and thus be |
| 1324 | * non-empty.) |
| 1325 | */ |
| 1326 | error = 0; |
| 1327 | if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { |
| 1328 | error = ENOTEMPTY; |
| 1329 | goto out; |
| 1330 | } |
| 1331 | /* |
| 1332 | * Delete the entry from the directory. For dos filesystems this |
| 1333 | * gets rid of the directory entry on disk, the in memory copy |
| 1334 | * still exists but the de_refcnt is <= 0. This prevents it from |
| 1335 | * being found by deget(). When the vput() on dep is done we give |
| 1336 | * up access and eventually msdosfs_reclaim() will be called which |
| 1337 | * will remove it from the denode cache. |
| 1338 | */ |
| 1339 | if ((error = removede(dp, ip)) != 0) |
| 1340 | goto out; |
| 1341 | /* |
| 1342 | * This is where we decrement the link count in the parent |
| 1343 | * directory. Since dos filesystems don't do this we just purge |
| 1344 | * the name cache and let go of the parent directory denode. |
| 1345 | */ |
| 1346 | VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); |
| 1347 | cache_purge(dvp); |
| 1348 | vput(dvp); |
| 1349 | dvp = NULL; |
| 1350 | /* |
| 1351 | * Truncate the directory that is being deleted. |
| 1352 | */ |
| 1353 | error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred); |
| 1354 | cache_purge(vp); |
| 1355 | out: |
| 1356 | VN_KNOTE(vp, NOTE_DELETE); |
| 1357 | if (dvp) |
| 1358 | vput(dvp); |
| 1359 | vput(vp); |
| 1360 | fstrans_done(mp); |
| 1361 | return (error); |
| 1362 | } |
| 1363 | |
| 1364 | int |
| 1365 | msdosfs_readdir(void *v) |
| 1366 | { |
| 1367 | struct vop_readdir_args /* { |
| 1368 | struct vnode *a_vp; |
| 1369 | struct uio *a_uio; |
| 1370 | kauth_cred_t a_cred; |
| 1371 | int *a_eofflag; |
| 1372 | off_t **a_cookies; |
| 1373 | int *a_ncookies; |
| 1374 | } */ *ap = v; |
| 1375 | int error = 0; |
| 1376 | int diff; |
| 1377 | long n; |
| 1378 | int blsize; |
| 1379 | long on; |
| 1380 | long lost; |
| 1381 | long count; |
| 1382 | u_long cn; |
| 1383 | ino_t fileno; |
| 1384 | u_long dirsperblk; |
| 1385 | long bias = 0; |
| 1386 | daddr_t bn, lbn; |
| 1387 | struct buf *bp; |
| 1388 | struct denode *dep = VTODE(ap->a_vp); |
| 1389 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1390 | struct direntry *dentp; |
| 1391 | struct dirent *dirbuf; |
| 1392 | struct uio *uio = ap->a_uio; |
| 1393 | off_t *cookies = NULL; |
| 1394 | int ncookies = 0, nc = 0; |
| 1395 | off_t offset, uio_off; |
| 1396 | int chksum = -1; |
| 1397 | uint16_t namlen; |
| 1398 | |
| 1399 | #ifdef MSDOSFS_DEBUG |
| 1400 | printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n" , |
| 1401 | ap->a_vp, uio, ap->a_cred, ap->a_eofflag); |
| 1402 | #endif |
| 1403 | |
| 1404 | /* |
| 1405 | * msdosfs_readdir() won't operate properly on regular files since |
| 1406 | * it does i/o only with the filesystem vnode, and hence can |
| 1407 | * retrieve the wrong block from the buffer cache for a plain file. |
| 1408 | * So, fail attempts to readdir() on a plain file. |
| 1409 | */ |
| 1410 | if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) |
| 1411 | return (ENOTDIR); |
| 1412 | |
| 1413 | /* |
| 1414 | * If the user buffer is smaller than the size of one dos directory |
| 1415 | * entry or the file offset is not a multiple of the size of a |
| 1416 | * directory entry, then we fail the read. |
| 1417 | */ |
| 1418 | count = uio->uio_resid & ~(sizeof(struct direntry) - 1); |
| 1419 | offset = uio->uio_offset; |
| 1420 | if (count < sizeof(struct direntry) || |
| 1421 | (offset & (sizeof(struct direntry) - 1))) |
| 1422 | return (EINVAL); |
| 1423 | lost = uio->uio_resid - count; |
| 1424 | uio->uio_resid = count; |
| 1425 | uio_off = uio->uio_offset; |
| 1426 | |
| 1427 | fstrans_start(ap->a_vp->v_mount, FSTRANS_SHARED); |
| 1428 | |
| 1429 | /* Allocate a temporary dirent buffer. */ |
| 1430 | dirbuf = malloc(sizeof(struct dirent), M_MSDOSFSTMP, M_WAITOK | M_ZERO); |
| 1431 | |
| 1432 | if (ap->a_ncookies) { |
| 1433 | nc = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); |
| 1434 | cookies = malloc(nc * sizeof (off_t), M_TEMP, M_WAITOK); |
| 1435 | *ap->a_cookies = cookies; |
| 1436 | } |
| 1437 | |
| 1438 | dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); |
| 1439 | |
| 1440 | /* |
| 1441 | * If they are reading from the root directory then, we simulate |
| 1442 | * the . and .. entries since these don't exist in the root |
| 1443 | * directory. We also set the offset bias to make up for having to |
| 1444 | * simulate these entries. By this I mean that at file offset 64 we |
| 1445 | * read the first entry in the root directory that lives on disk. |
| 1446 | */ |
| 1447 | if (dep->de_StartCluster == MSDOSFSROOT |
| 1448 | || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { |
| 1449 | #if 0 |
| 1450 | printf("msdosfs_readdir(): going after . or .. in root dir, " |
| 1451 | "offset %" PRIu64 "\n" , offset); |
| 1452 | #endif |
| 1453 | bias = 2 * sizeof(struct direntry); |
| 1454 | if (offset < bias) { |
| 1455 | for (n = (int)offset / sizeof(struct direntry); |
| 1456 | n < 2; n++) { |
| 1457 | if (FAT32(pmp)) |
| 1458 | dirbuf->d_fileno = cntobn(pmp, |
| 1459 | (ino_t)pmp->pm_rootdirblk) |
| 1460 | * dirsperblk; |
| 1461 | else |
| 1462 | dirbuf->d_fileno = 1; |
| 1463 | dirbuf->d_type = DT_DIR; |
| 1464 | switch (n) { |
| 1465 | case 0: |
| 1466 | dirbuf->d_namlen = 1; |
| 1467 | strlcpy(dirbuf->d_name, "." , |
| 1468 | sizeof(dirbuf->d_name)); |
| 1469 | break; |
| 1470 | case 1: |
| 1471 | dirbuf->d_namlen = 2; |
| 1472 | strlcpy(dirbuf->d_name, ".." , |
| 1473 | sizeof(dirbuf->d_name)); |
| 1474 | break; |
| 1475 | } |
| 1476 | dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); |
| 1477 | if (uio->uio_resid < dirbuf->d_reclen) |
| 1478 | goto out; |
| 1479 | error = uiomove(dirbuf, dirbuf->d_reclen, uio); |
| 1480 | if (error) |
| 1481 | goto out; |
| 1482 | offset += sizeof(struct direntry); |
| 1483 | uio_off = offset; |
| 1484 | if (cookies) { |
| 1485 | *cookies++ = offset; |
| 1486 | ncookies++; |
| 1487 | if (ncookies >= nc) |
| 1488 | goto out; |
| 1489 | } |
| 1490 | } |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | while (uio->uio_resid > 0) { |
| 1495 | lbn = de_cluster(pmp, offset - bias); |
| 1496 | on = (offset - bias) & pmp->pm_crbomask; |
| 1497 | n = MIN(pmp->pm_bpcluster - on, uio->uio_resid); |
| 1498 | diff = dep->de_FileSize - (offset - bias); |
| 1499 | if (diff <= 0) |
| 1500 | break; |
| 1501 | n = MIN(n, diff); |
| 1502 | if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) |
| 1503 | break; |
| 1504 | error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), blsize, |
| 1505 | 0, &bp); |
| 1506 | if (error) { |
| 1507 | goto bad; |
| 1508 | } |
| 1509 | n = MIN(n, blsize - bp->b_resid); |
| 1510 | |
| 1511 | /* |
| 1512 | * Convert from dos directory entries to fs-independent |
| 1513 | * directory entries. |
| 1514 | */ |
| 1515 | for (dentp = (struct direntry *)((char *)bp->b_data + on); |
| 1516 | (char *)dentp < (char *)bp->b_data + on + n; |
| 1517 | dentp++, offset += sizeof(struct direntry)) { |
| 1518 | #if 0 |
| 1519 | |
| 1520 | printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n" , |
| 1521 | dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); |
| 1522 | #endif |
| 1523 | /* |
| 1524 | * If this is an unused entry, we can stop. |
| 1525 | */ |
| 1526 | if (dentp->deName[0] == SLOT_EMPTY) { |
| 1527 | brelse(bp, 0); |
| 1528 | goto out; |
| 1529 | } |
| 1530 | /* |
| 1531 | * Skip deleted entries. |
| 1532 | */ |
| 1533 | if (dentp->deName[0] == SLOT_DELETED) { |
| 1534 | chksum = -1; |
| 1535 | continue; |
| 1536 | } |
| 1537 | |
| 1538 | /* |
| 1539 | * Handle Win95 long directory entries |
| 1540 | */ |
| 1541 | if (dentp->deAttributes == ATTR_WIN95) { |
| 1542 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) |
| 1543 | continue; |
| 1544 | chksum = win2unixfn((struct winentry *)dentp, |
| 1545 | dirbuf, chksum, &namlen, |
| 1546 | pmp->pm_flags & MSDOSFSMNT_UTF8); |
| 1547 | if (chksum != -1) |
| 1548 | dirbuf->d_namlen = namlen; |
| 1549 | continue; |
| 1550 | } |
| 1551 | |
| 1552 | /* |
| 1553 | * Skip volume labels |
| 1554 | */ |
| 1555 | if (dentp->deAttributes & ATTR_VOLUME) { |
| 1556 | chksum = -1; |
| 1557 | continue; |
| 1558 | } |
| 1559 | /* |
| 1560 | * This computation of d_fileno must match |
| 1561 | * the computation of va_fileid in |
| 1562 | * msdosfs_getattr. |
| 1563 | */ |
| 1564 | if (dentp->deAttributes & ATTR_DIRECTORY) { |
| 1565 | fileno = getushort(dentp->deStartCluster); |
| 1566 | if (FAT32(pmp)) |
| 1567 | fileno |= ((ino_t)getushort(dentp->deHighClust)) << 16; |
| 1568 | /* if this is the root directory */ |
| 1569 | if (fileno == MSDOSFSROOT) |
| 1570 | if (FAT32(pmp)) |
| 1571 | fileno = cntobn(pmp, |
| 1572 | (ino_t)pmp->pm_rootdirblk) |
| 1573 | * dirsperblk; |
| 1574 | else |
| 1575 | fileno = 1; |
| 1576 | else |
| 1577 | fileno = cntobn(pmp, fileno) * dirsperblk; |
| 1578 | dirbuf->d_fileno = fileno; |
| 1579 | dirbuf->d_type = DT_DIR; |
| 1580 | } else { |
| 1581 | dirbuf->d_fileno = |
| 1582 | offset / sizeof(struct direntry); |
| 1583 | dirbuf->d_type = DT_REG; |
| 1584 | } |
| 1585 | if (chksum != winChksum(dentp->deName)) |
| 1586 | dirbuf->d_namlen = dos2unixfn(dentp->deName, |
| 1587 | (u_char *)dirbuf->d_name, |
| 1588 | pmp->pm_flags & MSDOSFSMNT_SHORTNAME); |
| 1589 | else |
| 1590 | dirbuf->d_name[dirbuf->d_namlen] = 0; |
| 1591 | namlen = dirbuf->d_namlen; |
| 1592 | chksum = -1; |
| 1593 | dirbuf->d_reclen = _DIRENT_SIZE(dirbuf); |
| 1594 | if (uio->uio_resid < dirbuf->d_reclen) { |
| 1595 | brelse(bp, 0); |
| 1596 | goto out; |
| 1597 | } |
| 1598 | error = uiomove(dirbuf, dirbuf->d_reclen, uio); |
| 1599 | if (error) { |
| 1600 | brelse(bp, 0); |
| 1601 | goto out; |
| 1602 | } |
| 1603 | uio_off = offset + sizeof(struct direntry); |
| 1604 | if (cookies) { |
| 1605 | *cookies++ = offset + sizeof(struct direntry); |
| 1606 | ncookies++; |
| 1607 | if (ncookies >= nc) { |
| 1608 | brelse(bp, 0); |
| 1609 | goto out; |
| 1610 | } |
| 1611 | } |
| 1612 | } |
| 1613 | brelse(bp, 0); |
| 1614 | } |
| 1615 | |
| 1616 | out: |
| 1617 | uio->uio_offset = uio_off; |
| 1618 | uio->uio_resid += lost; |
| 1619 | if (dep->de_FileSize - (offset - bias) <= 0) |
| 1620 | *ap->a_eofflag = 1; |
| 1621 | else |
| 1622 | *ap->a_eofflag = 0; |
| 1623 | |
| 1624 | if (ap->a_ncookies) { |
| 1625 | if (error) { |
| 1626 | free(*ap->a_cookies, M_TEMP); |
| 1627 | *ap->a_ncookies = 0; |
| 1628 | *ap->a_cookies = NULL; |
| 1629 | } else |
| 1630 | *ap->a_ncookies = ncookies; |
| 1631 | } |
| 1632 | |
| 1633 | bad: |
| 1634 | free(dirbuf, M_MSDOSFSTMP); |
| 1635 | fstrans_done(ap->a_vp->v_mount); |
| 1636 | return (error); |
| 1637 | } |
| 1638 | |
| 1639 | /* |
| 1640 | * vp - address of vnode file the file |
| 1641 | * bn - which cluster we are interested in mapping to a filesystem block number. |
| 1642 | * vpp - returns the vnode for the block special file holding the filesystem |
| 1643 | * containing the file of interest |
| 1644 | * bnp - address of where to return the filesystem relative block number |
| 1645 | */ |
| 1646 | int |
| 1647 | msdosfs_bmap(void *v) |
| 1648 | { |
| 1649 | struct vop_bmap_args /* { |
| 1650 | struct vnode *a_vp; |
| 1651 | daddr_t a_bn; |
| 1652 | struct vnode **a_vpp; |
| 1653 | daddr_t *a_bnp; |
| 1654 | int *a_runp; |
| 1655 | } */ *ap = v; |
| 1656 | struct denode *dep = VTODE(ap->a_vp); |
| 1657 | int run, maxrun; |
| 1658 | daddr_t runbn; |
| 1659 | int status; |
| 1660 | |
| 1661 | if (ap->a_vpp != NULL) |
| 1662 | *ap->a_vpp = dep->de_devvp; |
| 1663 | if (ap->a_bnp == NULL) |
| 1664 | return (0); |
| 1665 | status = pcbmap(dep, ap->a_bn, ap->a_bnp, 0, 0); |
| 1666 | |
| 1667 | /* |
| 1668 | * From FreeBSD: |
| 1669 | * A little kludgy, but we loop calling pcbmap until we |
| 1670 | * reach the end of the contiguous piece, or reach MAXPHYS. |
| 1671 | * Since it reduces disk I/Os, the "wasted" CPU is put to |
| 1672 | * good use (4 to 5 fold sequential read I/O improvement on USB |
| 1673 | * drives). |
| 1674 | */ |
| 1675 | if (ap->a_runp != NULL) { |
| 1676 | /* taken from ufs_bmap */ |
| 1677 | maxrun = ulmin(MAXPHYS / dep->de_pmp->pm_bpcluster - 1, |
| 1678 | dep->de_pmp->pm_maxcluster - ap->a_bn); |
| 1679 | for (run = 1; run <= maxrun; run++) { |
| 1680 | if (pcbmap(dep, ap->a_bn + run, &runbn, NULL, NULL) |
| 1681 | != 0 || runbn != |
| 1682 | *ap->a_bnp + de_cn2bn(dep->de_pmp, run)) |
| 1683 | break; |
| 1684 | } |
| 1685 | *ap->a_runp = run - 1; |
| 1686 | } |
| 1687 | |
| 1688 | /* |
| 1689 | * We need to scale *ap->a_bnp by sector_size/DEV_BSIZE |
| 1690 | */ |
| 1691 | *ap->a_bnp = de_bn2kb(dep->de_pmp, *ap->a_bnp); |
| 1692 | return status; |
| 1693 | } |
| 1694 | |
| 1695 | int |
| 1696 | msdosfs_strategy(void *v) |
| 1697 | { |
| 1698 | struct vop_strategy_args /* { |
| 1699 | struct vnode *a_vp; |
| 1700 | struct buf *a_bp; |
| 1701 | } */ *ap = v; |
| 1702 | struct vnode *vp = ap->a_vp; |
| 1703 | struct buf *bp = ap->a_bp; |
| 1704 | struct denode *dep = VTODE(bp->b_vp); |
| 1705 | int error = 0; |
| 1706 | |
| 1707 | if (vp->v_type == VBLK || vp->v_type == VCHR) |
| 1708 | panic("msdosfs_strategy: spec" ); |
| 1709 | /* |
| 1710 | * If we don't already know the filesystem relative block number |
| 1711 | * then get it using pcbmap(). If pcbmap() returns the block |
| 1712 | * number as -1 then we've got a hole in the file. DOS filesystems |
| 1713 | * don't allow files with holes, so we shouldn't ever see this. |
| 1714 | */ |
| 1715 | if (bp->b_blkno == bp->b_lblkno) { |
| 1716 | error = pcbmap(dep, de_bn2cn(dep->de_pmp, bp->b_lblkno), |
| 1717 | &bp->b_blkno, 0, 0); |
| 1718 | if (error) |
| 1719 | bp->b_blkno = -1; |
| 1720 | if (bp->b_blkno == -1) |
| 1721 | clrbuf(bp); |
| 1722 | else |
| 1723 | bp->b_blkno = de_bn2kb(dep->de_pmp, bp->b_blkno); |
| 1724 | } |
| 1725 | if (bp->b_blkno == -1) { |
| 1726 | biodone(bp); |
| 1727 | return (error); |
| 1728 | } |
| 1729 | |
| 1730 | /* |
| 1731 | * Read/write the block from/to the disk that contains the desired |
| 1732 | * file block. |
| 1733 | */ |
| 1734 | |
| 1735 | vp = dep->de_devvp; |
| 1736 | return (VOP_STRATEGY(vp, bp)); |
| 1737 | } |
| 1738 | |
| 1739 | int |
| 1740 | msdosfs_print(void *v) |
| 1741 | { |
| 1742 | struct vop_print_args /* { |
| 1743 | struct vnode *vp; |
| 1744 | } */ *ap = v; |
| 1745 | struct denode *dep = VTODE(ap->a_vp); |
| 1746 | |
| 1747 | printf( |
| 1748 | "tag VT_MSDOSFS, startcluster %ld, dircluster %ld, diroffset %ld " , |
| 1749 | dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); |
| 1750 | printf(" dev %llu, %llu " , (unsigned long long)major(dep->de_dev), |
| 1751 | (unsigned long long)minor(dep->de_dev)); |
| 1752 | printf("\n" ); |
| 1753 | return (0); |
| 1754 | } |
| 1755 | |
| 1756 | int |
| 1757 | msdosfs_advlock(void *v) |
| 1758 | { |
| 1759 | struct vop_advlock_args /* { |
| 1760 | struct vnode *a_vp; |
| 1761 | void *a_id; |
| 1762 | int a_op; |
| 1763 | struct flock *a_fl; |
| 1764 | int a_flags; |
| 1765 | } */ *ap = v; |
| 1766 | struct denode *dep = VTODE(ap->a_vp); |
| 1767 | |
| 1768 | return lf_advlock(ap, &dep->de_lockf, dep->de_FileSize); |
| 1769 | } |
| 1770 | |
| 1771 | int |
| 1772 | msdosfs_pathconf(void *v) |
| 1773 | { |
| 1774 | struct vop_pathconf_args /* { |
| 1775 | struct vnode *a_vp; |
| 1776 | int a_name; |
| 1777 | register_t *a_retval; |
| 1778 | } */ *ap = v; |
| 1779 | |
| 1780 | switch (ap->a_name) { |
| 1781 | case _PC_LINK_MAX: |
| 1782 | *ap->a_retval = 1; |
| 1783 | return (0); |
| 1784 | case _PC_NAME_MAX: |
| 1785 | *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; |
| 1786 | return (0); |
| 1787 | case _PC_PATH_MAX: |
| 1788 | *ap->a_retval = PATH_MAX; |
| 1789 | return (0); |
| 1790 | case _PC_CHOWN_RESTRICTED: |
| 1791 | *ap->a_retval = 1; |
| 1792 | return (0); |
| 1793 | case _PC_NO_TRUNC: |
| 1794 | *ap->a_retval = 1; |
| 1795 | return (0); |
| 1796 | case _PC_SYNC_IO: |
| 1797 | *ap->a_retval = 1; |
| 1798 | return (0); |
| 1799 | case _PC_FILESIZEBITS: |
| 1800 | *ap->a_retval = 32; |
| 1801 | return (0); |
| 1802 | default: |
| 1803 | return (EINVAL); |
| 1804 | } |
| 1805 | /* NOTREACHED */ |
| 1806 | } |
| 1807 | |
| 1808 | int |
| 1809 | msdosfs_fsync(void *v) |
| 1810 | { |
| 1811 | struct vop_fsync_args /* { |
| 1812 | struct vnode *a_vp; |
| 1813 | kauth_cred_t a_cred; |
| 1814 | int a_flags; |
| 1815 | off_t offlo; |
| 1816 | off_t offhi; |
| 1817 | } */ *ap = v; |
| 1818 | struct vnode *vp = ap->a_vp; |
| 1819 | int wait; |
| 1820 | int error; |
| 1821 | |
| 1822 | fstrans_start(vp->v_mount, FSTRANS_LAZY); |
| 1823 | wait = (ap->a_flags & FSYNC_WAIT) != 0; |
| 1824 | error = vflushbuf(vp, ap->a_flags); |
| 1825 | if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) |
| 1826 | error = msdosfs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); |
| 1827 | |
| 1828 | if (error == 0 && ap->a_flags & FSYNC_CACHE) { |
| 1829 | struct denode *dep = VTODE(vp); |
| 1830 | struct vnode *devvp = dep->de_devvp; |
| 1831 | |
| 1832 | int l = 0; |
| 1833 | error = VOP_IOCTL(devvp, DIOCCACHESYNC, &l, FWRITE, |
| 1834 | curlwp->l_cred); |
| 1835 | } |
| 1836 | fstrans_done(vp->v_mount); |
| 1837 | |
| 1838 | return (error); |
| 1839 | } |
| 1840 | |
| 1841 | void |
| 1842 | msdosfs_detimes(struct denode *dep, const struct timespec *acc, |
| 1843 | const struct timespec *mod, const struct timespec *cre, int gmtoff) |
| 1844 | { |
| 1845 | struct timespec *ts = NULL, tsb; |
| 1846 | |
| 1847 | KASSERT(dep->de_flag & (DE_UPDATE | DE_CREATE | DE_ACCESS)); |
| 1848 | /* XXX just call getnanotime early and use result if needed? */ |
| 1849 | dep->de_flag |= DE_MODIFIED; |
| 1850 | if (dep->de_flag & DE_UPDATE) { |
| 1851 | if (mod == NULL) { |
| 1852 | getnanotime(&tsb); |
| 1853 | mod = ts = &tsb; |
| 1854 | } |
| 1855 | unix2dostime(mod, gmtoff, &dep->de_MDate, &dep->de_MTime, NULL); |
| 1856 | dep->de_Attributes |= ATTR_ARCHIVE; |
| 1857 | } |
| 1858 | if ((dep->de_pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0) { |
| 1859 | if (dep->de_flag & DE_ACCESS) { |
| 1860 | if (acc == NULL) |
| 1861 | acc = ts == NULL ? |
| 1862 | (getnanotime(&tsb), ts = &tsb) : ts; |
| 1863 | unix2dostime(acc, gmtoff, &dep->de_ADate, NULL, NULL); |
| 1864 | } |
| 1865 | if (dep->de_flag & DE_CREATE) { |
| 1866 | if (cre == NULL) |
| 1867 | cre = ts == NULL ? |
| 1868 | (getnanotime(&tsb), ts = &tsb) : ts; |
| 1869 | unix2dostime(cre, gmtoff, &dep->de_CDate, |
| 1870 | &dep->de_CTime, &dep->de_CHun); |
| 1871 | } |
| 1872 | } |
| 1873 | |
| 1874 | dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS); |
| 1875 | } |
| 1876 | |
| 1877 | /* Global vfs data structures for msdosfs */ |
| 1878 | int (**msdosfs_vnodeop_p)(void *); |
| 1879 | const struct vnodeopv_entry_desc msdosfs_vnodeop_entries[] = { |
| 1880 | { &vop_default_desc, vn_default_error }, |
| 1881 | { &vop_lookup_desc, msdosfs_lookup }, /* lookup */ |
| 1882 | { &vop_create_desc, msdosfs_create }, /* create */ |
| 1883 | { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ |
| 1884 | { &vop_open_desc, genfs_nullop }, /* open */ |
| 1885 | { &vop_close_desc, msdosfs_close }, /* close */ |
| 1886 | { &vop_access_desc, msdosfs_access }, /* access */ |
| 1887 | { &vop_getattr_desc, msdosfs_getattr }, /* getattr */ |
| 1888 | { &vop_setattr_desc, msdosfs_setattr }, /* setattr */ |
| 1889 | { &vop_read_desc, msdosfs_read }, /* read */ |
| 1890 | { &vop_write_desc, msdosfs_write }, /* write */ |
| 1891 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
| 1892 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
| 1893 | { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ |
| 1894 | { &vop_ioctl_desc, msdosfs_ioctl }, /* ioctl */ |
| 1895 | { &vop_poll_desc, msdosfs_poll }, /* poll */ |
| 1896 | { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ |
| 1897 | { &vop_revoke_desc, msdosfs_revoke }, /* revoke */ |
| 1898 | { &vop_mmap_desc, msdosfs_mmap }, /* mmap */ |
| 1899 | { &vop_fsync_desc, msdosfs_fsync }, /* fsync */ |
| 1900 | { &vop_seek_desc, msdosfs_seek }, /* seek */ |
| 1901 | { &vop_remove_desc, msdosfs_remove }, /* remove */ |
| 1902 | { &vop_link_desc, genfs_eopnotsupp }, /* link */ |
| 1903 | { &vop_rename_desc, msdosfs_rename }, /* rename */ |
| 1904 | { &vop_mkdir_desc, msdosfs_mkdir }, /* mkdir */ |
| 1905 | { &vop_rmdir_desc, msdosfs_rmdir }, /* rmdir */ |
| 1906 | { &vop_symlink_desc, genfs_eopnotsupp }, /* symlink */ |
| 1907 | { &vop_readdir_desc, msdosfs_readdir }, /* readdir */ |
| 1908 | { &vop_readlink_desc, genfs_einval }, /* readlink */ |
| 1909 | { &vop_abortop_desc, msdosfs_abortop }, /* abortop */ |
| 1910 | { &vop_inactive_desc, msdosfs_inactive }, /* inactive */ |
| 1911 | { &vop_reclaim_desc, msdosfs_reclaim }, /* reclaim */ |
| 1912 | { &vop_lock_desc, genfs_lock }, /* lock */ |
| 1913 | { &vop_unlock_desc, genfs_unlock }, /* unlock */ |
| 1914 | { &vop_bmap_desc, msdosfs_bmap }, /* bmap */ |
| 1915 | { &vop_strategy_desc, msdosfs_strategy }, /* strategy */ |
| 1916 | { &vop_print_desc, msdosfs_print }, /* print */ |
| 1917 | { &vop_islocked_desc, genfs_islocked }, /* islocked */ |
| 1918 | { &vop_pathconf_desc, msdosfs_pathconf }, /* pathconf */ |
| 1919 | { &vop_advlock_desc, msdosfs_advlock }, /* advlock */ |
| 1920 | { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ |
| 1921 | { &vop_getpages_desc, genfs_getpages }, /* getpages */ |
| 1922 | { &vop_putpages_desc, genfs_putpages }, /* putpages */ |
| 1923 | { NULL, NULL } |
| 1924 | }; |
| 1925 | const struct vnodeopv_desc msdosfs_vnodeop_opv_desc = |
| 1926 | { &msdosfs_vnodeop_p, msdosfs_vnodeop_entries }; |
| 1927 | |