| 1 | /* $FreeBSD: src/sys/msdosfs/msdosfs_vnops.c,v 1.95.2.4 2003/06/13 15:05:47 trhodes Exp $ */ |
| 2 | /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_vnops.c,v 1.54 2007/11/20 21:03:50 dillon Exp $ */ |
| 3 | /* $NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $ */ |
| 4 | |
| 5 | /*- |
| 6 | * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. |
| 7 | * Copyright (C) 1994, 1995, 1997 TooLs GmbH. |
| 8 | * All rights reserved. |
| 9 | * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * 3. All advertising materials mentioning features or use of this software |
| 20 | * must display the following acknowledgement: |
| 21 | * This product includes software developed by TooLs GmbH. |
| 22 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
| 23 | * derived from this software without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
| 26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 28 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 29 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 30 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 31 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 32 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 33 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 34 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | /* |
| 37 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
| 38 | * |
| 39 | * You can do anything you want with this software, just don't say you wrote |
| 40 | * it, and don't remove this notice. |
| 41 | * |
| 42 | * This software is provided "as is". |
| 43 | * |
| 44 | * The author supplies this software to be publicly redistributed on the |
| 45 | * understanding that the author is not responsible for the correct |
| 46 | * functioning of this software in any circumstances and is not liable for |
| 47 | * any damages caused by this software. |
| 48 | * |
| 49 | * October 1992 |
| 50 | */ |
| 51 | |
| 52 | #include <sys/param.h> |
| 53 | #include <sys/systm.h> |
| 54 | #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ |
| 55 | #include <sys/kernel.h> |
| 56 | #include <sys/stat.h> |
| 57 | #include <sys/buf.h> |
| 58 | #include <sys/proc.h> |
| 59 | #include <sys/priv.h> |
| 60 | #include <sys/namei.h> |
| 61 | #include <sys/mount.h> |
| 62 | #include <sys/unistd.h> |
| 63 | #include <sys/vnode.h> |
| 64 | #include <sys/malloc.h> |
| 65 | #include <sys/dirent.h> |
| 66 | #include <sys/signalvar.h> |
| 67 | |
| 68 | #include <vm/vm.h> |
| 69 | #include <vm/vm_extern.h> |
| 70 | #include <vm/vm_zone.h> |
| 71 | #include <vm/vnode_pager.h> |
| 72 | |
| 73 | #include <sys/buf2.h> |
| 74 | |
| 75 | #include "bpb.h" |
| 76 | #include "direntry.h" |
| 77 | #include "denode.h" |
| 78 | #include "msdosfsmount.h" |
| 79 | #include "fat.h" |
| 80 | |
| 81 | #define DOS_FILESIZE_MAX 0xffffffff |
| 82 | |
| 83 | /* |
| 84 | * Prototypes for MSDOSFS vnode operations |
| 85 | */ |
| 86 | static int msdosfs_create (struct vop_old_create_args *); |
| 87 | static int msdosfs_mknod (struct vop_old_mknod_args *); |
| 88 | static int msdosfs_open (struct vop_open_args *); |
| 89 | static int msdosfs_close (struct vop_close_args *); |
| 90 | static int msdosfs_access (struct vop_access_args *); |
| 91 | static int msdosfs_getattr (struct vop_getattr_args *); |
| 92 | static int msdosfs_setattr (struct vop_setattr_args *); |
| 93 | static int msdosfs_read (struct vop_read_args *); |
| 94 | static int msdosfs_write (struct vop_write_args *); |
| 95 | static int msdosfs_fsync (struct vop_fsync_args *); |
| 96 | static int msdosfs_remove (struct vop_old_remove_args *); |
| 97 | static int msdosfs_link (struct vop_old_link_args *); |
| 98 | static int msdosfs_rename (struct vop_old_rename_args *); |
| 99 | static int msdosfs_mkdir (struct vop_old_mkdir_args *); |
| 100 | static int msdosfs_rmdir (struct vop_old_rmdir_args *); |
| 101 | static int msdosfs_symlink (struct vop_old_symlink_args *); |
| 102 | static int msdosfs_readdir (struct vop_readdir_args *); |
| 103 | static int msdosfs_bmap (struct vop_bmap_args *); |
| 104 | static int msdosfs_strategy (struct vop_strategy_args *); |
| 105 | static int msdosfs_print (struct vop_print_args *); |
| 106 | static int msdosfs_pathconf (struct vop_pathconf_args *ap); |
| 107 | |
| 108 | /* |
| 109 | * Some general notes: |
| 110 | * |
| 111 | * In the ufs filesystem the inodes, superblocks, and indirect blocks are |
| 112 | * read/written using the vnode for the filesystem. Blocks that represent |
| 113 | * the contents of a file are read/written using the vnode for the file |
| 114 | * (including directories when they are read/written as files). This |
| 115 | * presents problems for the dos filesystem because data that should be in |
| 116 | * an inode (if dos had them) resides in the directory itself. Since we |
| 117 | * must update directory entries without the benefit of having the vnode |
| 118 | * for the directory we must use the vnode for the filesystem. This means |
| 119 | * that when a directory is actually read/written (via read, write, or |
| 120 | * readdir, or seek) we must use the vnode for the filesystem instead of |
| 121 | * the vnode for the directory as would happen in ufs. This is to insure we |
| 122 | * retreive the correct block from the buffer cache since the hash value is |
| 123 | * based upon the vnode address and the desired block number. |
| 124 | */ |
| 125 | |
| 126 | /* |
| 127 | * Create a regular file. On entry the directory to contain the file being |
| 128 | * created is locked. We must release before we return. |
| 129 | * |
| 130 | * msdosfs_create(struct vnode *a_dvp, struct vnode **a_vpp, |
| 131 | * struct componentname *a_cnp, struct vattr *a_vap) |
| 132 | */ |
| 133 | static int |
| 134 | msdosfs_create(struct vop_old_create_args *ap) |
| 135 | { |
| 136 | struct componentname *cnp = ap->a_cnp; |
| 137 | struct denode ndirent; |
| 138 | struct denode *dep; |
| 139 | struct denode *pdep = VTODE(ap->a_dvp); |
| 140 | struct timespec ts; |
| 141 | int error; |
| 142 | |
| 143 | #ifdef MSDOSFS_DEBUG |
| 144 | kprintf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); |
| 145 | #endif |
| 146 | |
| 147 | /* |
| 148 | * If this is the root directory and there is no space left we |
| 149 | * can't do anything. This is because the root directory can not |
| 150 | * change size. |
| 151 | */ |
| 152 | if (pdep->de_StartCluster == MSDOSFSROOT |
| 153 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
| 154 | error = ENOSPC; |
| 155 | goto bad; |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Create a directory entry for the file, then call createde() to |
| 160 | * have it installed. NOTE: DOS files are always executable. We |
| 161 | * use the absence of the owner write bit to make the file |
| 162 | * readonly. |
| 163 | */ |
| 164 | bzero(&ndirent, sizeof(ndirent)); |
| 165 | error = uniqdosname(pdep, cnp, ndirent.de_Name); |
| 166 | if (error) |
| 167 | goto bad; |
| 168 | |
| 169 | ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? |
| 170 | ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; |
| 171 | ndirent.de_LowerCase = 0; |
| 172 | ndirent.de_StartCluster = 0; |
| 173 | ndirent.de_FileSize = 0; |
| 174 | ndirent.de_dev = pdep->de_dev; |
| 175 | ndirent.de_devvp = pdep->de_devvp; |
| 176 | ndirent.de_pmp = pdep->de_pmp; |
| 177 | ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; |
| 178 | getnanotime(&ts); |
| 179 | DETIMES(&ndirent, &ts, &ts, &ts); |
| 180 | error = createde(&ndirent, pdep, &dep, cnp); |
| 181 | if (error) |
| 182 | goto bad; |
| 183 | *ap->a_vpp = DETOV(dep); |
| 184 | return (0); |
| 185 | |
| 186 | bad: |
| 187 | return (error); |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * msdosfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, |
| 192 | * struct componentname *a_cnp, struct vattr *a_vap) |
| 193 | */ |
| 194 | static int |
| 195 | msdosfs_mknod(struct vop_old_mknod_args *ap) |
| 196 | { |
| 197 | switch (ap->a_vap->va_type) { |
| 198 | case VDIR: |
| 199 | return (msdosfs_mkdir((struct vop_old_mkdir_args *)ap)); |
| 200 | break; |
| 201 | |
| 202 | case VREG: |
| 203 | return (msdosfs_create((struct vop_old_create_args *)ap)); |
| 204 | break; |
| 205 | |
| 206 | default: |
| 207 | return (EINVAL); |
| 208 | } |
| 209 | /* NOTREACHED */ |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * msdosfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, |
| 214 | * struct file *a_fp) |
| 215 | */ |
| 216 | static int |
| 217 | msdosfs_open(struct vop_open_args *ap) |
| 218 | { |
| 219 | return(vop_stdopen(ap)); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * msdosfs_close(struct vnode *a_vp, int a_fflag) |
| 224 | */ |
| 225 | static int |
| 226 | msdosfs_close(struct vop_close_args *ap) |
| 227 | { |
| 228 | struct vnode *vp = ap->a_vp; |
| 229 | struct denode *dep = VTODE(vp); |
| 230 | struct timespec ts; |
| 231 | |
| 232 | if (vp->v_sysref.refcnt > 1) { |
| 233 | getnanotime(&ts); |
| 234 | DETIMES(dep, &ts, &ts, &ts); |
| 235 | } |
| 236 | return (vop_stdclose(ap)); |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * msdosfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) |
| 241 | */ |
| 242 | static int |
| 243 | msdosfs_access(struct vop_access_args *ap) |
| 244 | { |
| 245 | struct vnode *vp = ap->a_vp; |
| 246 | struct denode *dep = VTODE(ap->a_vp); |
| 247 | struct msdosfsmount *pmp = dep->de_pmp; |
| 248 | struct ucred *cred = ap->a_cred; |
| 249 | mode_t mask, file_mode, mode = ap->a_mode; |
| 250 | gid_t *gp; |
| 251 | int i; |
| 252 | |
| 253 | file_mode = (S_IXUSR|S_IXGRP|S_IXOTH) | (S_IRUSR|S_IRGRP|S_IROTH) | |
| 254 | ((dep->de_Attributes & ATTR_READONLY) ? 0 : (S_IWUSR|S_IWGRP|S_IWOTH)); |
| 255 | file_mode &= pmp->pm_mask; |
| 256 | |
| 257 | /* |
| 258 | * Disallow write attempts on read-only file systems; |
| 259 | * unless the file is a socket, fifo, or a block or |
| 260 | * character device resident on the file system. |
| 261 | */ |
| 262 | if (mode & VWRITE) { |
| 263 | switch (vp->v_type) { |
| 264 | case VDIR: |
| 265 | case VLNK: |
| 266 | case VREG: |
| 267 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 268 | return (EROFS); |
| 269 | break; |
| 270 | default: |
| 271 | break; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /* User id 0 always gets access. */ |
| 276 | if (cred->cr_uid == 0) |
| 277 | return 0; |
| 278 | |
| 279 | mask = 0; |
| 280 | |
| 281 | /* Otherwise, check the owner. */ |
| 282 | if (cred->cr_uid == pmp->pm_uid) { |
| 283 | if (mode & VEXEC) |
| 284 | mask |= S_IXUSR; |
| 285 | if (mode & VREAD) |
| 286 | mask |= S_IRUSR; |
| 287 | if (mode & VWRITE) |
| 288 | mask |= S_IWUSR; |
| 289 | return (file_mode & mask) == mask ? 0 : EACCES; |
| 290 | } |
| 291 | |
| 292 | /* Otherwise, check the groups. */ |
| 293 | for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++) |
| 294 | if (pmp->pm_gid == *gp) { |
| 295 | if (mode & VEXEC) |
| 296 | mask |= S_IXGRP; |
| 297 | if (mode & VREAD) |
| 298 | mask |= S_IRGRP; |
| 299 | if (mode & VWRITE) |
| 300 | mask |= S_IWGRP; |
| 301 | return (file_mode & mask) == mask ? 0 : EACCES; |
| 302 | } |
| 303 | |
| 304 | /* Otherwise, check everyone else. */ |
| 305 | if (mode & VEXEC) |
| 306 | mask |= S_IXOTH; |
| 307 | if (mode & VREAD) |
| 308 | mask |= S_IROTH; |
| 309 | if (mode & VWRITE) |
| 310 | mask |= S_IWOTH; |
| 311 | return (file_mode & mask) == mask ? 0 : EACCES; |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * msdosfs_getattr(struct vnode *a_vp, struct vattr *a_vap) |
| 316 | */ |
| 317 | static int |
| 318 | msdosfs_getattr(struct vop_getattr_args *ap) |
| 319 | { |
| 320 | struct denode *dep = VTODE(ap->a_vp); |
| 321 | struct msdosfsmount *pmp = dep->de_pmp; |
| 322 | struct vattr *vap = ap->a_vap; |
| 323 | mode_t mode; |
| 324 | struct timespec ts; |
| 325 | u_long dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); |
| 326 | u_long fileid; |
| 327 | |
| 328 | getnanotime(&ts); |
| 329 | DETIMES(dep, &ts, &ts, &ts); |
| 330 | vap->va_fsid = dev2udev(dep->de_dev); |
| 331 | /* |
| 332 | * The following computation of the fileid must be the same as that |
| 333 | * used in msdosfs_readdir() to compute d_fileno. If not, pwd |
| 334 | * doesn't work. |
| 335 | */ |
| 336 | if (dep->de_Attributes & ATTR_DIRECTORY) { |
| 337 | fileid = xcntobn(pmp, dep->de_StartCluster) * dirsperblk; |
| 338 | if (dep->de_StartCluster == MSDOSFSROOT) |
| 339 | fileid = 1; |
| 340 | } else { |
| 341 | fileid = xcntobn(pmp, dep->de_dirclust) * dirsperblk; |
| 342 | if (dep->de_dirclust == MSDOSFSROOT) |
| 343 | fileid = roottobn(pmp, 0) * dirsperblk; |
| 344 | fileid += dep->de_diroffset / sizeof(struct direntry); |
| 345 | } |
| 346 | vap->va_fileid = fileid; |
| 347 | if ((dep->de_Attributes & ATTR_READONLY) == 0) |
| 348 | mode = S_IRWXU|S_IRWXG|S_IRWXO; |
| 349 | else |
| 350 | mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
| 351 | vap->va_mode = mode & pmp->pm_mask; |
| 352 | vap->va_uid = pmp->pm_uid; |
| 353 | vap->va_gid = pmp->pm_gid; |
| 354 | vap->va_nlink = 1; |
| 355 | vap->va_rmajor = VNOVAL; |
| 356 | vap->va_rminor = VNOVAL; |
| 357 | vap->va_size = dep->de_FileSize; |
| 358 | dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); |
| 359 | if (pmp->pm_flags & MSDOSFSMNT_LONGNAME) { |
| 360 | dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); |
| 361 | dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CHun, &vap->va_ctime); |
| 362 | } else { |
| 363 | vap->va_atime = vap->va_mtime; |
| 364 | vap->va_ctime = vap->va_mtime; |
| 365 | } |
| 366 | vap->va_flags = 0; |
| 367 | if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) |
| 368 | vap->va_flags |= SF_ARCHIVED; |
| 369 | vap->va_gen = 0; |
| 370 | vap->va_blocksize = pmp->pm_bpcluster; |
| 371 | vap->va_bytes = |
| 372 | (dep->de_FileSize + pmp->pm_crbomask) & ~pmp->pm_crbomask; |
| 373 | vap->va_type = ap->a_vp->v_type; |
| 374 | vap->va_filerev = dep->de_modrev; |
| 375 | return (0); |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * msdosfs_setattr(struct vnode *a_vp, struct vattr *a_vap, |
| 380 | * struct ucred *a_cred) |
| 381 | */ |
| 382 | static int |
| 383 | msdosfs_setattr(struct vop_setattr_args *ap) |
| 384 | { |
| 385 | struct vnode *vp = ap->a_vp; |
| 386 | struct denode *dep = VTODE(ap->a_vp); |
| 387 | struct msdosfsmount *pmp = dep->de_pmp; |
| 388 | struct vattr *vap = ap->a_vap; |
| 389 | struct ucred *cred = ap->a_cred; |
| 390 | int error = 0; |
| 391 | |
| 392 | #ifdef MSDOSFS_DEBUG |
| 393 | kprintf("msdosfs_setattr(): vp %p, vap %p, cred %p\n", |
| 394 | ap->a_vp, vap, cred); |
| 395 | #endif |
| 396 | |
| 397 | /* |
| 398 | * Check for unsettable attributes. |
| 399 | */ |
| 400 | if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || |
| 401 | (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || |
| 402 | (vap->va_blocksize != VNOVAL) || (vap->va_rmajor != VNOVAL) || |
| 403 | (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { |
| 404 | #ifdef MSDOSFS_DEBUG |
| 405 | kprintf("msdosfs_setattr(): returning EINVAL\n"); |
| 406 | kprintf(" va_type %d, va_nlink %llx, va_fsid %x, va_fileid %llx\n", |
| 407 | vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid); |
| 408 | kprintf(" va_blocksize %lx, va_rmajor %x, va_bytes %qx, va_gen %llx\n", |
| 409 | vap->va_blocksize, vap->va_rmajor, vap->va_bytes, vap->va_gen); |
| 410 | kprintf(" va_uid %x, va_gid %x\n", |
| 411 | vap->va_uid, vap->va_gid); |
| 412 | #endif |
| 413 | return (EINVAL); |
| 414 | } |
| 415 | if (vap->va_flags != VNOVAL) { |
| 416 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 417 | return (EROFS); |
| 418 | if (cred->cr_uid != pmp->pm_uid && |
| 419 | (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) |
| 420 | return (error); |
| 421 | /* |
| 422 | * We are very inconsistent about handling unsupported |
| 423 | * attributes. We ignored the access time and the |
| 424 | * read and execute bits. We were strict for the other |
| 425 | * attributes. |
| 426 | * |
| 427 | * Here we are strict, stricter than ufs in not allowing |
| 428 | * users to attempt to set SF_SETTABLE bits or anyone to |
| 429 | * set unsupported bits. However, we ignore attempts to |
| 430 | * set ATTR_ARCHIVE for directories `cp -pr' from a more |
| 431 | * sensible file system attempts it a lot. |
| 432 | */ |
| 433 | if (cred->cr_uid != 0) { |
| 434 | if (vap->va_flags & SF_SETTABLE) |
| 435 | return EPERM; |
| 436 | } |
| 437 | if (vap->va_flags & ~SF_ARCHIVED) |
| 438 | return EOPNOTSUPP; |
| 439 | if (vap->va_flags & SF_ARCHIVED) |
| 440 | dep->de_Attributes &= ~ATTR_ARCHIVE; |
| 441 | else if (!(dep->de_Attributes & ATTR_DIRECTORY)) |
| 442 | dep->de_Attributes |= ATTR_ARCHIVE; |
| 443 | dep->de_flag |= DE_MODIFIED; |
| 444 | } |
| 445 | |
| 446 | if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { |
| 447 | uid_t uid; |
| 448 | gid_t gid; |
| 449 | |
| 450 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 451 | return (EROFS); |
| 452 | uid = vap->va_uid; |
| 453 | if (uid == (uid_t)VNOVAL) |
| 454 | uid = pmp->pm_uid; |
| 455 | gid = vap->va_gid; |
| 456 | if (gid == (gid_t)VNOVAL) |
| 457 | gid = pmp->pm_gid; |
| 458 | if ((cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || |
| 459 | (gid != pmp->pm_gid && !groupmember(gid, cred))) && |
| 460 | (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) |
| 461 | return error; |
| 462 | if (uid != pmp->pm_uid || gid != pmp->pm_gid) |
| 463 | return EINVAL; |
| 464 | } |
| 465 | |
| 466 | if (vap->va_size != VNOVAL) { |
| 467 | /* |
| 468 | * Disallow write attempts on read-only file systems; |
| 469 | * unless the file is a socket, fifo, or a block or |
| 470 | * character device resident on the file system. |
| 471 | */ |
| 472 | switch (vp->v_type) { |
| 473 | case VDIR: |
| 474 | return (EISDIR); |
| 475 | /* NOT REACHED */ |
| 476 | case VLNK: |
| 477 | case VREG: |
| 478 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 479 | return (EROFS); |
| 480 | break; |
| 481 | default: |
| 482 | break; |
| 483 | } |
| 484 | error = detrunc(dep, vap->va_size, 0); |
| 485 | if (error) |
| 486 | return error; |
| 487 | } |
| 488 | if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { |
| 489 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 490 | return (EROFS); |
| 491 | if (cred->cr_uid != pmp->pm_uid && |
| 492 | (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0)) && |
| 493 | ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || |
| 494 | (error = VOP_ACCESS(ap->a_vp, VWRITE, cred)))) |
| 495 | return (error); |
| 496 | if (vp->v_type != VDIR) { |
| 497 | if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && |
| 498 | vap->va_atime.tv_sec != VNOVAL) { |
| 499 | dep->de_flag &= ~DE_ACCESS; |
| 500 | unix2dostime(&vap->va_atime, &dep->de_ADate, |
| 501 | NULL, NULL); |
| 502 | } |
| 503 | if (vap->va_mtime.tv_sec != VNOVAL) { |
| 504 | dep->de_flag &= ~DE_UPDATE; |
| 505 | unix2dostime(&vap->va_mtime, &dep->de_MDate, |
| 506 | &dep->de_MTime, NULL); |
| 507 | } |
| 508 | dep->de_Attributes |= ATTR_ARCHIVE; |
| 509 | dep->de_flag |= DE_MODIFIED; |
| 510 | } |
| 511 | } |
| 512 | /* |
| 513 | * DOS files only have the ability to have their writability |
| 514 | * attribute set, so we use the owner write bit to set the readonly |
| 515 | * attribute. |
| 516 | */ |
| 517 | if (vap->va_mode != (mode_t)VNOVAL) { |
| 518 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 519 | return (EROFS); |
| 520 | if (cred->cr_uid != pmp->pm_uid && |
| 521 | (error = priv_check_cred(cred, PRIV_VFS_SETATTR, 0))) |
| 522 | return (error); |
| 523 | if (vp->v_type != VDIR) { |
| 524 | /* We ignore the read and execute bits. */ |
| 525 | if (vap->va_mode & VWRITE) |
| 526 | dep->de_Attributes &= ~ATTR_READONLY; |
| 527 | else |
| 528 | dep->de_Attributes |= ATTR_READONLY; |
| 529 | dep->de_Attributes |= ATTR_ARCHIVE; |
| 530 | dep->de_flag |= DE_MODIFIED; |
| 531 | } |
| 532 | } |
| 533 | return (deupdat(dep, 1)); |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * msdosfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, |
| 538 | * struct ucred *a_cred) |
| 539 | */ |
| 540 | static int |
| 541 | msdosfs_read(struct vop_read_args *ap) |
| 542 | { |
| 543 | int error = 0; |
| 544 | int blsize; |
| 545 | int isadir; |
| 546 | int orig_resid; |
| 547 | u_int n; |
| 548 | u_long diff; |
| 549 | u_long on; |
| 550 | daddr_t lbn; |
| 551 | daddr_t rablock; |
| 552 | off_t raoffset; |
| 553 | off_t loffset; |
| 554 | int rasize; |
| 555 | int seqcount; |
| 556 | struct buf *bp; |
| 557 | struct vnode *vp = ap->a_vp; |
| 558 | struct denode *dep = VTODE(vp); |
| 559 | struct msdosfsmount *pmp = dep->de_pmp; |
| 560 | struct uio *uio = ap->a_uio; |
| 561 | |
| 562 | if (uio->uio_offset < 0) |
| 563 | return (EINVAL); |
| 564 | |
| 565 | if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX) |
| 566 | return (0); |
| 567 | /* |
| 568 | * If they didn't ask for any data, then we are done. |
| 569 | */ |
| 570 | orig_resid = uio->uio_resid; |
| 571 | if (orig_resid <= 0) |
| 572 | return (0); |
| 573 | |
| 574 | seqcount = ap->a_ioflag >> IO_SEQSHIFT; |
| 575 | |
| 576 | isadir = dep->de_Attributes & ATTR_DIRECTORY; |
| 577 | do { |
| 578 | if (uio->uio_offset >= dep->de_FileSize) |
| 579 | break; |
| 580 | |
| 581 | /* |
| 582 | * note: lbn is a cluster number, not a device block number. |
| 583 | */ |
| 584 | lbn = de_off2cn(pmp, uio->uio_offset); |
| 585 | loffset = de_cn2doff(pmp, lbn); |
| 586 | |
| 587 | /* |
| 588 | * If we are operating on a directory file then be sure to |
| 589 | * do i/o with the vnode for the filesystem instead of the |
| 590 | * vnode for the directory. |
| 591 | */ |
| 592 | if (isadir) { |
| 593 | /* |
| 594 | * convert cluster # to block #. lbn is a |
| 595 | * device block number after this. |
| 596 | */ |
| 597 | error = pcbmap(dep, lbn, &lbn, NULL, &blsize); |
| 598 | loffset = de_bntodoff(pmp, lbn); |
| 599 | if (error == E2BIG) { |
| 600 | error = EINVAL; |
| 601 | break; |
| 602 | } else if (error) |
| 603 | break; |
| 604 | error = bread(pmp->pm_devvp, loffset, blsize, &bp); |
| 605 | } else { |
| 606 | blsize = pmp->pm_bpcluster; |
| 607 | rablock = lbn + 1; |
| 608 | raoffset = de_cn2doff(pmp, rablock); |
| 609 | if (seqcount > 1 && |
| 610 | raoffset < dep->de_FileSize) { |
| 611 | rasize = pmp->pm_bpcluster; |
| 612 | error = breadn(vp, loffset, blsize, |
| 613 | &raoffset, &rasize, 1, &bp); |
| 614 | } else { |
| 615 | error = bread(vp, loffset, blsize, &bp); |
| 616 | } |
| 617 | } |
| 618 | if (error) { |
| 619 | brelse(bp); |
| 620 | break; |
| 621 | } |
| 622 | on = uio->uio_offset & pmp->pm_crbomask; |
| 623 | diff = pmp->pm_bpcluster - on; |
| 624 | n = diff > uio->uio_resid ? uio->uio_resid : diff; |
| 625 | diff = dep->de_FileSize - uio->uio_offset; |
| 626 | if (diff < n) |
| 627 | n = diff; |
| 628 | diff = blsize - bp->b_resid; |
| 629 | if (diff < n) |
| 630 | n = diff; |
| 631 | error = uiomove(bp->b_data + on, (int) n, uio); |
| 632 | brelse(bp); |
| 633 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
| 634 | if (!isadir && (error == 0 || uio->uio_resid != orig_resid) && |
| 635 | (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) |
| 636 | dep->de_flag |= DE_ACCESS; |
| 637 | return (error); |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * Write data to a file or directory. |
| 642 | * |
| 643 | * msdosfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, |
| 644 | * struct ucred *a_cred) |
| 645 | */ |
| 646 | static int |
| 647 | msdosfs_write(struct vop_write_args *ap) |
| 648 | { |
| 649 | int n; |
| 650 | int croffset; |
| 651 | int resid; |
| 652 | u_long osize; |
| 653 | int error = 0; |
| 654 | u_long count; |
| 655 | daddr_t cn, lastcn; |
| 656 | struct buf *bp; |
| 657 | int ioflag = ap->a_ioflag; |
| 658 | struct uio *uio = ap->a_uio; |
| 659 | struct thread *td = uio->uio_td; |
| 660 | struct vnode *vp = ap->a_vp; |
| 661 | struct vnode *thisvp; |
| 662 | struct denode *dep = VTODE(vp); |
| 663 | struct msdosfsmount *pmp = dep->de_pmp; |
| 664 | struct proc *p = (td ? td->td_proc : NULL); |
| 665 | struct lwp *lp = (td ? td->td_lwp : NULL); |
| 666 | |
| 667 | #ifdef MSDOSFS_DEBUG |
| 668 | kprintf("msdosfs_write(vp %p, uio %p, ioflag %x, cred %p\n", |
| 669 | vp, uio, ioflag, ap->a_cred); |
| 670 | kprintf("msdosfs_write(): diroff %lu, dirclust %lu, startcluster %lu\n", |
| 671 | dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); |
| 672 | #endif |
| 673 | |
| 674 | switch (vp->v_type) { |
| 675 | case VREG: |
| 676 | if (ioflag & IO_APPEND) |
| 677 | uio->uio_offset = dep->de_FileSize; |
| 678 | thisvp = vp; |
| 679 | break; |
| 680 | case VDIR: |
| 681 | return EISDIR; |
| 682 | default: |
| 683 | panic("msdosfs_write(): bad file type"); |
| 684 | } |
| 685 | |
| 686 | if (uio->uio_offset < 0) |
| 687 | return (EFBIG); |
| 688 | |
| 689 | if (uio->uio_resid == 0) |
| 690 | return (0); |
| 691 | |
| 692 | /* |
| 693 | * If they've exceeded their filesize limit, tell them about it. |
| 694 | */ |
| 695 | if (p && |
| 696 | ((uoff_t)uio->uio_offset + uio->uio_resid > |
| 697 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { |
| 698 | lwpsignal(p, lp, SIGXFSZ); |
| 699 | return (EFBIG); |
| 700 | } |
| 701 | |
| 702 | if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX) |
| 703 | return (EFBIG); |
| 704 | |
| 705 | /* |
| 706 | * If the offset we are starting the write at is beyond the end of |
| 707 | * the file, then they've done a seek. Unix filesystems allow |
| 708 | * files with holes in them, DOS doesn't so we must fill the hole |
| 709 | * with zeroed blocks. |
| 710 | */ |
| 711 | if (uio->uio_offset > dep->de_FileSize) { |
| 712 | error = deextend(dep, uio->uio_offset); |
| 713 | if (error) |
| 714 | return (error); |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * Remember some values in case the write fails. |
| 719 | */ |
| 720 | resid = uio->uio_resid; |
| 721 | osize = dep->de_FileSize; |
| 722 | |
| 723 | /* |
| 724 | * If we write beyond the end of the file, extend it to its ultimate |
| 725 | * size ahead of the time to hopefully get a contiguous area. |
| 726 | */ |
| 727 | if (uio->uio_offset + resid > osize) { |
| 728 | count = de_clcount(pmp, uio->uio_offset + resid) - |
| 729 | de_clcount(pmp, osize); |
| 730 | error = extendfile(dep, count, NULL, NULL, 0); |
| 731 | if (error && (error != ENOSPC || (ioflag & IO_UNIT))) |
| 732 | goto errexit; |
| 733 | lastcn = dep->de_fc[FC_LASTFC].fc_frcn; |
| 734 | } else |
| 735 | lastcn = de_clcount(pmp, osize) - 1; |
| 736 | |
| 737 | do { |
| 738 | if (de_off2cn(pmp, uio->uio_offset) > lastcn) { |
| 739 | error = ENOSPC; |
| 740 | break; |
| 741 | } |
| 742 | |
| 743 | croffset = uio->uio_offset & pmp->pm_crbomask; |
| 744 | n = min(uio->uio_resid, pmp->pm_bpcluster - croffset); |
| 745 | if (uio->uio_offset + n > dep->de_FileSize) { |
| 746 | dep->de_FileSize = uio->uio_offset + n; |
| 747 | /* The object size needs to be set before buffer is allocated */ |
| 748 | vnode_pager_setsize(vp, dep->de_FileSize); |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * If either the whole cluster gets written, or we write |
| 753 | * the cluster from its start beyond EOF, then no need to |
| 754 | * read data from disk. |
| 755 | * |
| 756 | * If UIO_NOCOPY is set we have to do a read-before-write |
| 757 | * to fill in any missing pieces of the buffer since no |
| 758 | * actual overwrite will occur. |
| 759 | */ |
| 760 | cn = de_off2cn(pmp, uio->uio_offset); |
| 761 | if ((uio->uio_offset & pmp->pm_crbomask) == 0 |
| 762 | && uio->uio_segflg != UIO_NOCOPY |
| 763 | && (de_off2cn(pmp, uio->uio_offset + uio->uio_resid) |
| 764 | > de_off2cn(pmp, uio->uio_offset) |
| 765 | || uio->uio_offset + uio->uio_resid >= dep->de_FileSize)) { |
| 766 | bp = getblk(thisvp, de_cn2doff(pmp, cn), |
| 767 | pmp->pm_bpcluster, 0, 0); |
| 768 | clrbuf(bp); |
| 769 | /* |
| 770 | * Do the bmap now, since pcbmap needs buffers |
| 771 | * for the fat table. (see msdosfs_strategy) |
| 772 | */ |
| 773 | if (bp->b_bio2.bio_offset == NOOFFSET) { |
| 774 | daddr_t lblkno = de_off2cn(pmp, bp->b_loffset); |
| 775 | daddr_t dblkno; |
| 776 | |
| 777 | error = pcbmap(dep, lblkno, |
| 778 | &dblkno, NULL, NULL); |
| 779 | if (error || dblkno == (daddr_t)-1) { |
| 780 | bp->b_bio2.bio_offset = NOOFFSET; |
| 781 | } else { |
| 782 | bp->b_bio2.bio_offset = de_bntodoff(pmp, dblkno); |
| 783 | } |
| 784 | } |
| 785 | if (bp->b_bio2.bio_offset == NOOFFSET) { |
| 786 | brelse(bp); |
| 787 | if (!error) |
| 788 | error = EIO; /* XXX */ |
| 789 | break; |
| 790 | } |
| 791 | } else { |
| 792 | /* |
| 793 | * The block we need to write into exists, so read |
| 794 | * it in. |
| 795 | */ |
| 796 | error = bread(thisvp, de_cn2doff(pmp, cn), |
| 797 | pmp->pm_bpcluster, &bp); |
| 798 | if (error) { |
| 799 | brelse(bp); |
| 800 | break; |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * Should these vnode_pager_* functions be done on dir |
| 806 | * files? |
| 807 | */ |
| 808 | |
| 809 | /* |
| 810 | * Copy the data from user space into the buf header. |
| 811 | */ |
| 812 | error = uiomove(bp->b_data + croffset, n, uio); |
| 813 | if (error) { |
| 814 | brelse(bp); |
| 815 | break; |
| 816 | } |
| 817 | |
| 818 | /* |
| 819 | * If they want this synchronous then write it and wait for |
| 820 | * it. Otherwise, if on a cluster boundary write it |
| 821 | * asynchronously so we can move on to the next block |
| 822 | * without delay. Otherwise do a delayed write because we |
| 823 | * may want to write somemore into the block later. |
| 824 | */ |
| 825 | if (ioflag & IO_SYNC) |
| 826 | bwrite(bp); |
| 827 | else if (n + croffset == pmp->pm_bpcluster) |
| 828 | bawrite(bp); |
| 829 | else |
| 830 | bdwrite(bp); |
| 831 | dep->de_flag |= DE_UPDATE; |
| 832 | } while (error == 0 && uio->uio_resid > 0); |
| 833 | |
| 834 | /* |
| 835 | * If the write failed and they want us to, truncate the file back |
| 836 | * to the size it was before the write was attempted. |
| 837 | */ |
| 838 | errexit: |
| 839 | if (error) { |
| 840 | if (ioflag & IO_UNIT) { |
| 841 | detrunc(dep, osize, ioflag & IO_SYNC); |
| 842 | uio->uio_offset -= resid - uio->uio_resid; |
| 843 | uio->uio_resid = resid; |
| 844 | } else { |
| 845 | detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC); |
| 846 | if (uio->uio_resid != resid) |
| 847 | error = 0; |
| 848 | } |
| 849 | } else if (ioflag & IO_SYNC) |
| 850 | error = deupdat(dep, 1); |
| 851 | return (error); |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * Flush the blocks of a file to disk. |
| 856 | * |
| 857 | * This function is worthless for vnodes that represent directories. Maybe we |
| 858 | * could just do a sync if they try an fsync on a directory file. |
| 859 | * |
| 860 | * msdosfs_fsync(struct vnode *a_vp, int a_waitfor) |
| 861 | */ |
| 862 | static int |
| 863 | msdosfs_fsync(struct vop_fsync_args *ap) |
| 864 | { |
| 865 | struct vnode *vp = ap->a_vp; |
| 866 | |
| 867 | /* |
| 868 | * Flush all dirty buffers associated with a vnode. |
| 869 | */ |
| 870 | #ifdef DIAGNOSTIC |
| 871 | loop: |
| 872 | #endif |
| 873 | vfsync(vp, ap->a_waitfor, 0, NULL, NULL); |
| 874 | #ifdef DIAGNOSTIC |
| 875 | if (ap->a_waitfor == MNT_WAIT && !RB_EMPTY(&vp->v_rbdirty_tree)) { |
| 876 | vprint("msdosfs_fsync: dirty", vp); |
| 877 | goto loop; |
| 878 | } |
| 879 | #endif |
| 880 | return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); |
| 881 | } |
| 882 | |
| 883 | /* |
| 884 | * msdosfs_remove(struct vnode *a_dvp, struct vnode *a_vp, |
| 885 | * struct componentname *a_cnp) |
| 886 | */ |
| 887 | static int |
| 888 | msdosfs_remove(struct vop_old_remove_args *ap) |
| 889 | { |
| 890 | struct denode *dep = VTODE(ap->a_vp); |
| 891 | struct denode *ddep = VTODE(ap->a_dvp); |
| 892 | int error; |
| 893 | |
| 894 | if (ap->a_vp->v_type == VDIR) |
| 895 | error = EPERM; |
| 896 | else |
| 897 | error = removede(ddep, dep); |
| 898 | #ifdef MSDOSFS_DEBUG |
| 899 | kprintf("msdosfs_remove(), dep %p, v_sysrefs %d\n", |
| 900 | dep, ap->a_vp->v_sysref.refcnt); |
| 901 | #endif |
| 902 | return (error); |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * DOS filesystems don't know what links are. But since we already called |
| 907 | * msdosfs_lookup() with create and lockparent, the parent is locked so we |
| 908 | * have to free it before we return the error. |
| 909 | * |
| 910 | * msdosfs_link(struct vnode *a_tdvp, struct vnode *a_vp, |
| 911 | * struct componentname *a_cnp) |
| 912 | */ |
| 913 | static int |
| 914 | msdosfs_link(struct vop_old_link_args *ap) |
| 915 | { |
| 916 | return (EOPNOTSUPP); |
| 917 | } |
| 918 | |
| 919 | /* |
| 920 | * Renames on files require moving the denode to a new hash queue since the |
| 921 | * denode's location is used to compute which hash queue to put the file |
| 922 | * in. Unless it is a rename in place. For example "mv a b". |
| 923 | * |
| 924 | * What follows is the basic algorithm: |
| 925 | * |
| 926 | * if (file move) { |
| 927 | * if (dest file exists) { |
| 928 | * remove dest file |
| 929 | * } |
| 930 | * if (dest and src in same directory) { |
| 931 | * rewrite name in existing directory slot |
| 932 | * } else { |
| 933 | * write new entry in dest directory |
| 934 | * update offset and dirclust in denode |
| 935 | * move denode to new hash chain |
| 936 | * clear old directory entry |
| 937 | * } |
| 938 | * } else { |
| 939 | * directory move |
| 940 | * if (dest directory exists) { |
| 941 | * if (dest is not empty) { |
| 942 | * return ENOTEMPTY |
| 943 | * } |
| 944 | * remove dest directory |
| 945 | * } |
| 946 | * if (dest and src in same directory) { |
| 947 | * rewrite name in existing entry |
| 948 | * } else { |
| 949 | * be sure dest is not a child of src directory |
| 950 | * write entry in dest directory |
| 951 | * update "." and ".." in moved directory |
| 952 | * clear old directory entry for moved directory |
| 953 | * } |
| 954 | * } |
| 955 | * |
| 956 | * On entry: |
| 957 | * source's parent directory is unlocked |
| 958 | * source file or directory is unlocked |
| 959 | * destination's parent directory is locked |
| 960 | * destination file or directory is locked if it exists |
| 961 | * |
| 962 | * On exit: |
| 963 | * all denodes should be released |
| 964 | * |
| 965 | * Notes: |
| 966 | * I'm not sure how the memory containing the pathnames pointed at by the |
| 967 | * componentname structures is freed, there may be some memory bleeding |
| 968 | * for each rename done. |
| 969 | * |
| 970 | * msdosfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, |
| 971 | * struct componentname *a_fcnp, struct vnode *a_tdvp, |
| 972 | * struct vnode *a_tvp, struct componentname *a_tcnp) |
| 973 | */ |
| 974 | static int |
| 975 | msdosfs_rename(struct vop_old_rename_args *ap) |
| 976 | { |
| 977 | struct vnode *tdvp = ap->a_tdvp; |
| 978 | struct vnode *fvp = ap->a_fvp; |
| 979 | struct vnode *fdvp = ap->a_fdvp; |
| 980 | struct vnode *tvp = ap->a_tvp; |
| 981 | struct componentname *tcnp = ap->a_tcnp; |
| 982 | struct componentname *fcnp = ap->a_fcnp; |
| 983 | struct denode *ip, *xp, *dp, *zp; |
| 984 | u_char toname[11], oldname[11]; |
| 985 | u_long from_diroffset, to_diroffset; |
| 986 | u_char to_count; |
| 987 | int doingdirectory = 0, newparent = 0; |
| 988 | int error; |
| 989 | u_long cn; |
| 990 | daddr_t bn; |
| 991 | struct msdosfsmount *pmp; |
| 992 | struct direntry *dotdotp; |
| 993 | struct buf *bp; |
| 994 | |
| 995 | pmp = VFSTOMSDOSFS(fdvp->v_mount); |
| 996 | |
| 997 | /* |
| 998 | * Check for cross-device rename. |
| 999 | */ |
| 1000 | if ((fvp->v_mount != tdvp->v_mount) || |
| 1001 | (tvp && (fvp->v_mount != tvp->v_mount))) { |
| 1002 | error = EXDEV; |
| 1003 | abortit: |
| 1004 | if (tdvp == tvp) |
| 1005 | vrele(tdvp); |
| 1006 | else |
| 1007 | vput(tdvp); |
| 1008 | if (tvp) |
| 1009 | vput(tvp); |
| 1010 | vrele(fdvp); |
| 1011 | vrele(fvp); |
| 1012 | return (error); |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * If source and dest are the same, do nothing. |
| 1017 | */ |
| 1018 | if (tvp == fvp) { |
| 1019 | error = 0; |
| 1020 | goto abortit; |
| 1021 | } |
| 1022 | |
| 1023 | /* |
| 1024 | * fvp, fdvp are unlocked, tvp, tdvp are locked. Lock fvp and note |
| 1025 | * that we have to unlock it to use the abortit target. |
| 1026 | */ |
| 1027 | error = vn_lock(fvp, LK_EXCLUSIVE); |
| 1028 | if (error) |
| 1029 | goto abortit; |
| 1030 | dp = VTODE(fdvp); |
| 1031 | ip = VTODE(fvp); |
| 1032 | |
| 1033 | /* |
| 1034 | * Be sure we are not renaming ".", "..", or an alias of ".". This |
| 1035 | * leads to a crippled directory tree. It's pretty tough to do a |
| 1036 | * "ls" or "pwd" with the "." directory entry missing, and "cd .." |
| 1037 | * doesn't work if the ".." entry is missing. |
| 1038 | */ |
| 1039 | if (ip->de_Attributes & ATTR_DIRECTORY) { |
| 1040 | /* |
| 1041 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
| 1042 | */ |
| 1043 | if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || |
| 1044 | dp == ip || |
| 1045 | (fcnp->cn_flags & CNP_ISDOTDOT) || |
| 1046 | (tcnp->cn_flags & CNP_ISDOTDOT) || |
| 1047 | (ip->de_flag & DE_RENAME)) { |
| 1048 | vn_unlock(fvp); |
| 1049 | error = EINVAL; |
| 1050 | goto abortit; |
| 1051 | } |
| 1052 | ip->de_flag |= DE_RENAME; |
| 1053 | doingdirectory++; |
| 1054 | } |
| 1055 | |
| 1056 | /* |
| 1057 | * fvp locked, fdvp unlocked, tvp, tdvp locked. DE_RENAME only |
| 1058 | * set if doingdirectory. We will get fvp unlocked in fairly |
| 1059 | * short order. dp and xp must be setup and fvp must be unlocked |
| 1060 | * for the out and bad targets to work properly. |
| 1061 | */ |
| 1062 | dp = VTODE(tdvp); |
| 1063 | xp = tvp ? VTODE(tvp) : NULL; |
| 1064 | |
| 1065 | /* |
| 1066 | * Remember direntry place to use for destination |
| 1067 | */ |
| 1068 | to_diroffset = dp->de_fndoffset; |
| 1069 | to_count = dp->de_fndcnt; |
| 1070 | |
| 1071 | /* |
| 1072 | * If ".." must be changed (ie the directory gets a new |
| 1073 | * parent) then the source directory must not be in the |
| 1074 | * directory heirarchy above the target, as this would |
| 1075 | * orphan everything below the source directory. Also |
| 1076 | * the user must have write permission in the source so |
| 1077 | * as to be able to change "..". We must repeat the call |
| 1078 | * to namei, as the parent directory is unlocked by the |
| 1079 | * call to doscheckpath(). |
| 1080 | */ |
| 1081 | error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); |
| 1082 | vn_unlock(fvp); |
| 1083 | if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) |
| 1084 | newparent = 1; |
| 1085 | |
| 1086 | /* |
| 1087 | * ok. fvp, fdvp unlocked, tvp, tdvp locked. tvp may be NULL. |
| 1088 | * DE_RENAME only set if doingdirectory. |
| 1089 | */ |
| 1090 | if (doingdirectory && newparent) { |
| 1091 | if (error) /* write access check above */ |
| 1092 | goto bad; |
| 1093 | if (xp != NULL) { |
| 1094 | vput(tvp); |
| 1095 | xp = NULL; |
| 1096 | } |
| 1097 | /* |
| 1098 | * checkpath vput's tdvp (VTOI(dp)) on return no matter what, |
| 1099 | * get an extra ref so we wind up with just an unlocked, ref'd |
| 1100 | * tdvp. The 'out' target skips tvp and tdvp cleanups (tdvp |
| 1101 | * isn't locked so we can't use the out target). |
| 1102 | */ |
| 1103 | vref(tdvp); |
| 1104 | error = doscheckpath(ip, dp); |
| 1105 | tcnp->cn_flags |= CNP_PDIRUNLOCK; |
| 1106 | if (error) { |
| 1107 | vrele(tdvp); |
| 1108 | goto out; |
| 1109 | } |
| 1110 | /* |
| 1111 | * relookup no longer messes with the ref count. tdvp must |
| 1112 | * be unlocked on entry and on success will be locked on |
| 1113 | * return. |
| 1114 | */ |
| 1115 | error = relookup(tdvp, &tvp, tcnp); |
| 1116 | if (error) { |
| 1117 | if (tcnp->cn_flags & CNP_PDIRUNLOCK) |
| 1118 | vrele(tdvp); |
| 1119 | else |
| 1120 | vput(tdvp); |
| 1121 | goto out; |
| 1122 | } |
| 1123 | |
| 1124 | /* |
| 1125 | * tvp and tdvp are now locked again. |
| 1126 | */ |
| 1127 | dp = VTODE(tdvp); |
| 1128 | xp = tvp ? VTODE(tvp) : NULL; |
| 1129 | } |
| 1130 | |
| 1131 | /* |
| 1132 | * tvp and tdvp are now locked again, the 'bad' target can be used |
| 1133 | * to clean them up again. Delete an existant target and clean |
| 1134 | * up tvp. Set xp to NULL to indicate that tvp has been cleaned up. |
| 1135 | */ |
| 1136 | if (xp != NULL) { |
| 1137 | /* |
| 1138 | * Target must be empty if a directory and have no links |
| 1139 | * to it. Also, ensure source and target are compatible |
| 1140 | * (both directories, or both not directories). |
| 1141 | */ |
| 1142 | if (xp->de_Attributes & ATTR_DIRECTORY) { |
| 1143 | if (!dosdirempty(xp)) { |
| 1144 | error = ENOTEMPTY; |
| 1145 | goto bad; |
| 1146 | } |
| 1147 | if (!doingdirectory) { |
| 1148 | error = ENOTDIR; |
| 1149 | goto bad; |
| 1150 | } |
| 1151 | } else if (doingdirectory) { |
| 1152 | error = EISDIR; |
| 1153 | goto bad; |
| 1154 | } |
| 1155 | error = removede(dp, xp); |
| 1156 | if (error) |
| 1157 | goto bad; |
| 1158 | vput(tvp); |
| 1159 | xp = NULL; |
| 1160 | tvp = NULL; |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * Convert the filename in tcnp into a dos filename. We copy this |
| 1165 | * into the denode and directory entry for the destination |
| 1166 | * file/directory. |
| 1167 | */ |
| 1168 | error = uniqdosname(VTODE(tdvp), tcnp, toname); |
| 1169 | if (error) |
| 1170 | goto bad; |
| 1171 | |
| 1172 | /* |
| 1173 | * Since from wasn't locked at various places above, we have to do |
| 1174 | * a relookup here. If the target and source are the same directory |
| 1175 | * we have to unlock the target directory in order to safely relookup |
| 1176 | * the source, because relookup expects its directory to be unlocked. |
| 1177 | * |
| 1178 | * Note that ap->a_fvp is still valid and ref'd. Any cleanup must |
| 1179 | * now take that into account. |
| 1180 | * |
| 1181 | * The tdvp locking issues make this a real mess. |
| 1182 | */ |
| 1183 | fcnp->cn_flags &= ~CNP_MODMASK; |
| 1184 | fcnp->cn_flags |= CNP_LOCKPARENT; |
| 1185 | if (newparent == 0) |
| 1186 | vn_unlock(tdvp); |
| 1187 | error = relookup(fdvp, &fvp, fcnp); |
| 1188 | if (error || fvp == NULL) { |
| 1189 | /* |
| 1190 | * From name has disappeared. Note: fdvp might == tdvp. |
| 1191 | * |
| 1192 | * DE_RENAME is only set if doingdirectory. |
| 1193 | */ |
| 1194 | if (doingdirectory) |
| 1195 | panic("rename: lost dir entry"); |
| 1196 | if (fcnp->cn_flags & CNP_PDIRUNLOCK) |
| 1197 | vrele(fdvp); |
| 1198 | else |
| 1199 | vput(fdvp); |
| 1200 | if (newparent == 0) |
| 1201 | vrele(tdvp); |
| 1202 | else |
| 1203 | vput(tdvp); |
| 1204 | vrele(ap->a_fvp); |
| 1205 | return(0); |
| 1206 | } |
| 1207 | |
| 1208 | /* |
| 1209 | * No error occured. tdvp, fdvp and fvp are all locked. If |
| 1210 | * newparent was 0 be aware that fdvp == tdvp. tvp has been cleaned |
| 1211 | * up. ap->a_fvp is still refd. |
| 1212 | */ |
| 1213 | xp = VTODE(fvp); |
| 1214 | zp = VTODE(fdvp); |
| 1215 | from_diroffset = zp->de_fndoffset; |
| 1216 | |
| 1217 | /* |
| 1218 | * Ensure that the directory entry still exists and has not |
| 1219 | * changed till now. If the source is a file the entry may |
| 1220 | * have been unlinked or renamed. In either case there is |
| 1221 | * no further work to be done. If the source is a directory |
| 1222 | * then it cannot have been rmdir'ed or renamed; this is |
| 1223 | * prohibited by the DE_RENAME flag. |
| 1224 | * |
| 1225 | * DE_RENAME is only set if doingdirectory. |
| 1226 | */ |
| 1227 | if (xp != ip) { |
| 1228 | if (doingdirectory) |
| 1229 | panic("rename: lost dir entry"); |
| 1230 | goto done; |
| 1231 | } else { |
| 1232 | u_long new_dirclust; |
| 1233 | u_long new_diroffset; |
| 1234 | |
| 1235 | /* |
| 1236 | * First write a new entry in the destination |
| 1237 | * directory and mark the entry in the source directory |
| 1238 | * as deleted. Then move the denode to the correct hash |
| 1239 | * chain for its new location in the filesystem. And, if |
| 1240 | * we moved a directory, then update its .. entry to point |
| 1241 | * to the new parent directory. |
| 1242 | */ |
| 1243 | bcopy(ip->de_Name, oldname, 11); |
| 1244 | bcopy(toname, ip->de_Name, 11); /* update denode */ |
| 1245 | dp->de_fndoffset = to_diroffset; |
| 1246 | dp->de_fndcnt = to_count; |
| 1247 | error = createde(ip, dp, NULL, tcnp); |
| 1248 | if (error) { |
| 1249 | bcopy(oldname, ip->de_Name, 11); |
| 1250 | goto done; |
| 1251 | } |
| 1252 | ip->de_refcnt++; |
| 1253 | zp->de_fndoffset = from_diroffset; |
| 1254 | error = removede(zp, ip); |
| 1255 | if (error) { |
| 1256 | /* XXX should really panic here, fs is corrupt */ |
| 1257 | goto done; |
| 1258 | } |
| 1259 | if (!doingdirectory) { |
| 1260 | error = pcbmap(dp, de_cluster(pmp, to_diroffset), |
| 1261 | NULL, &new_dirclust, NULL); |
| 1262 | if (error) { |
| 1263 | /* XXX should really panic here, fs is corrupt */ |
| 1264 | goto done; |
| 1265 | } |
| 1266 | if (new_dirclust == MSDOSFSROOT) |
| 1267 | new_diroffset = to_diroffset; |
| 1268 | else |
| 1269 | new_diroffset = to_diroffset & pmp->pm_crbomask; |
| 1270 | msdosfs_reinsert(ip, new_dirclust, new_diroffset); |
| 1271 | } |
| 1272 | } |
| 1273 | |
| 1274 | /* |
| 1275 | * If we moved a directory to a new parent directory, then we must |
| 1276 | * fixup the ".." entry in the moved directory. |
| 1277 | */ |
| 1278 | if (doingdirectory && newparent) { |
| 1279 | cn = ip->de_StartCluster; |
| 1280 | if (cn == MSDOSFSROOT) { |
| 1281 | /* this should never happen */ |
| 1282 | panic("msdosfs_rename(): updating .. in root directory?"); |
| 1283 | } else { |
| 1284 | bn = xcntobn(pmp, cn); |
| 1285 | } |
| 1286 | error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp); |
| 1287 | if (error) { |
| 1288 | /* XXX should really panic here, fs is corrupt */ |
| 1289 | brelse(bp); |
| 1290 | goto done; |
| 1291 | } |
| 1292 | dotdotp = (struct direntry *)bp->b_data + 1; |
| 1293 | putushort(dotdotp->deStartCluster, dp->de_StartCluster); |
| 1294 | if (FAT32(pmp)) |
| 1295 | putushort(dotdotp->deHighClust, dp->de_StartCluster >> 16); |
| 1296 | error = bwrite(bp); |
| 1297 | if (error) { |
| 1298 | /* XXX should really panic here, fs is corrupt */ |
| 1299 | goto done; |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | /* |
| 1304 | * done case fvp, fdvp, tdvp are locked. ap->a_fvp is refd |
| 1305 | */ |
| 1306 | done: |
| 1307 | if (doingdirectory) |
| 1308 | ip->de_flag &= ~DE_RENAME; /* XXX fvp not locked */ |
| 1309 | vput(fvp); |
| 1310 | if (newparent) |
| 1311 | vput(fdvp); |
| 1312 | else |
| 1313 | vrele(fdvp); |
| 1314 | vput(tdvp); |
| 1315 | vrele(ap->a_fvp); |
| 1316 | return (error); |
| 1317 | |
| 1318 | /* |
| 1319 | * 'bad' target: xp governs tvp. tvp and tdvp arel ocked, fdvp and fvp |
| 1320 | * are not locked. ip points to fvp's inode which may have DE_RENAME |
| 1321 | * set. |
| 1322 | */ |
| 1323 | bad: |
| 1324 | if (xp) |
| 1325 | vput(tvp); |
| 1326 | vput(tdvp); |
| 1327 | out: |
| 1328 | /* |
| 1329 | * 'out' target: tvp and tdvp have already been cleaned up. |
| 1330 | */ |
| 1331 | if (doingdirectory) |
| 1332 | ip->de_flag &= ~DE_RENAME; |
| 1333 | vrele(fdvp); |
| 1334 | vrele(fvp); |
| 1335 | return (error); |
| 1336 | |
| 1337 | } |
| 1338 | |
| 1339 | static struct { |
| 1340 | struct direntry dot; |
| 1341 | struct direntry dotdot; |
| 1342 | } dosdirtemplate = { |
| 1343 | { ". ", " ", /* the . entry */ |
| 1344 | ATTR_DIRECTORY, /* file attribute */ |
| 1345 | 0, /* reserved */ |
| 1346 | 0, { 0, 0 }, { 0, 0 }, /* create time & date */ |
| 1347 | { 0, 0 }, /* access date */ |
| 1348 | { 0, 0 }, /* high bits of start cluster */ |
| 1349 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
| 1350 | { 0, 0 }, /* startcluster */ |
| 1351 | { 0, 0, 0, 0 } /* filesize */ |
| 1352 | }, |
| 1353 | { ".. ", " ", /* the .. entry */ |
| 1354 | ATTR_DIRECTORY, /* file attribute */ |
| 1355 | 0, /* reserved */ |
| 1356 | 0, { 0, 0 }, { 0, 0 }, /* create time & date */ |
| 1357 | { 0, 0 }, /* access date */ |
| 1358 | { 0, 0 }, /* high bits of start cluster */ |
| 1359 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
| 1360 | { 0, 0 }, /* startcluster */ |
| 1361 | { 0, 0, 0, 0 } /* filesize */ |
| 1362 | } |
| 1363 | }; |
| 1364 | |
| 1365 | /* |
| 1366 | * msdosfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, |
| 1367 | * struct componentname *a_cnp, struct vattr *a_vap) |
| 1368 | */ |
| 1369 | static int |
| 1370 | msdosfs_mkdir(struct vop_old_mkdir_args *ap) |
| 1371 | { |
| 1372 | struct componentname *cnp = ap->a_cnp; |
| 1373 | struct denode *dep; |
| 1374 | struct denode *pdep = VTODE(ap->a_dvp); |
| 1375 | struct direntry *denp; |
| 1376 | struct msdosfsmount *pmp = pdep->de_pmp; |
| 1377 | struct buf *bp; |
| 1378 | u_long newcluster, pcl; |
| 1379 | int bn; |
| 1380 | int error; |
| 1381 | struct denode ndirent; |
| 1382 | struct timespec ts; |
| 1383 | |
| 1384 | /* |
| 1385 | * If this is the root directory and there is no space left we |
| 1386 | * can't do anything. This is because the root directory can not |
| 1387 | * change size. |
| 1388 | */ |
| 1389 | if (pdep->de_StartCluster == MSDOSFSROOT |
| 1390 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
| 1391 | error = ENOSPC; |
| 1392 | goto bad2; |
| 1393 | } |
| 1394 | |
| 1395 | /* |
| 1396 | * Allocate a cluster to hold the about to be created directory. |
| 1397 | */ |
| 1398 | error = clusteralloc(pmp, 0, 1, CLUST_EOFE, &newcluster, NULL); |
| 1399 | if (error) |
| 1400 | goto bad2; |
| 1401 | |
| 1402 | bzero(&ndirent, sizeof(ndirent)); |
| 1403 | ndirent.de_pmp = pmp; |
| 1404 | ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; |
| 1405 | getnanotime(&ts); |
| 1406 | DETIMES(&ndirent, &ts, &ts, &ts); |
| 1407 | |
| 1408 | /* |
| 1409 | * Now fill the cluster with the "." and ".." entries. And write |
| 1410 | * the cluster to disk. This way it is there for the parent |
| 1411 | * directory to be pointing at if there were a crash. |
| 1412 | */ |
| 1413 | bn = xcntobn(pmp, newcluster); |
| 1414 | /* always succeeds */ |
| 1415 | bp = getblk(pmp->pm_devvp, de_bntodoff(pmp, bn), |
| 1416 | pmp->pm_bpcluster, 0, 0); |
| 1417 | bzero(bp->b_data, pmp->pm_bpcluster); |
| 1418 | bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); |
| 1419 | denp = (struct direntry *)bp->b_data; |
| 1420 | putushort(denp[0].deStartCluster, newcluster); |
| 1421 | putushort(denp[0].deCDate, ndirent.de_CDate); |
| 1422 | putushort(denp[0].deCTime, ndirent.de_CTime); |
| 1423 | denp[0].deCHundredth = ndirent.de_CHun; |
| 1424 | putushort(denp[0].deADate, ndirent.de_ADate); |
| 1425 | putushort(denp[0].deMDate, ndirent.de_MDate); |
| 1426 | putushort(denp[0].deMTime, ndirent.de_MTime); |
| 1427 | pcl = pdep->de_StartCluster; |
| 1428 | if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) |
| 1429 | pcl = 0; |
| 1430 | putushort(denp[1].deStartCluster, pcl); |
| 1431 | putushort(denp[1].deCDate, ndirent.de_CDate); |
| 1432 | putushort(denp[1].deCTime, ndirent.de_CTime); |
| 1433 | denp[1].deCHundredth = ndirent.de_CHun; |
| 1434 | putushort(denp[1].deADate, ndirent.de_ADate); |
| 1435 | putushort(denp[1].deMDate, ndirent.de_MDate); |
| 1436 | putushort(denp[1].deMTime, ndirent.de_MTime); |
| 1437 | if (FAT32(pmp)) { |
| 1438 | putushort(denp[0].deHighClust, newcluster >> 16); |
| 1439 | putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); |
| 1440 | } |
| 1441 | |
| 1442 | error = bwrite(bp); |
| 1443 | if (error) |
| 1444 | goto bad; |
| 1445 | |
| 1446 | /* |
| 1447 | * Now build up a directory entry pointing to the newly allocated |
| 1448 | * cluster. This will be written to an empty slot in the parent |
| 1449 | * directory. |
| 1450 | */ |
| 1451 | error = uniqdosname(pdep, cnp, ndirent.de_Name); |
| 1452 | if (error) |
| 1453 | goto bad; |
| 1454 | |
| 1455 | ndirent.de_Attributes = ATTR_DIRECTORY; |
| 1456 | ndirent.de_LowerCase = 0; |
| 1457 | ndirent.de_StartCluster = newcluster; |
| 1458 | ndirent.de_FileSize = 0; |
| 1459 | ndirent.de_dev = pdep->de_dev; |
| 1460 | ndirent.de_devvp = pdep->de_devvp; |
| 1461 | error = createde(&ndirent, pdep, &dep, cnp); |
| 1462 | if (error) |
| 1463 | goto bad; |
| 1464 | *ap->a_vpp = DETOV(dep); |
| 1465 | return (0); |
| 1466 | |
| 1467 | bad: |
| 1468 | clusterfree(pmp, newcluster, NULL); |
| 1469 | bad2: |
| 1470 | return (error); |
| 1471 | } |
| 1472 | |
| 1473 | /* |
| 1474 | * msdosfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, |
| 1475 | * struct componentname *a_cnp) |
| 1476 | */ |
| 1477 | static int |
| 1478 | msdosfs_rmdir(struct vop_old_rmdir_args *ap) |
| 1479 | { |
| 1480 | struct vnode *vp = ap->a_vp; |
| 1481 | struct vnode *dvp = ap->a_dvp; |
| 1482 | struct denode *ip, *dp; |
| 1483 | int error; |
| 1484 | |
| 1485 | ip = VTODE(vp); |
| 1486 | dp = VTODE(dvp); |
| 1487 | |
| 1488 | /* |
| 1489 | * Verify the directory is empty (and valid). |
| 1490 | * (Rmdir ".." won't be valid since |
| 1491 | * ".." will contain a reference to |
| 1492 | * the current directory and thus be |
| 1493 | * non-empty.) |
| 1494 | */ |
| 1495 | error = 0; |
| 1496 | if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { |
| 1497 | error = ENOTEMPTY; |
| 1498 | goto out; |
| 1499 | } |
| 1500 | /* |
| 1501 | * Delete the entry from the directory. For dos filesystems this |
| 1502 | * gets rid of the directory entry on disk, the in memory copy |
| 1503 | * still exists but the de_refcnt is <= 0. This prevents it from |
| 1504 | * being found by deget(). When the vput() on dep is done we give |
| 1505 | * up access and eventually msdosfs_reclaim() will be called which |
| 1506 | * will remove it from the denode cache. |
| 1507 | */ |
| 1508 | error = removede(dp, ip); |
| 1509 | if (error) |
| 1510 | goto out; |
| 1511 | /* |
| 1512 | * This is where we decrement the link count in the parent |
| 1513 | * directory. Since dos filesystems don't do this we just purge |
| 1514 | * the name cache. |
| 1515 | */ |
| 1516 | vn_unlock(dvp); |
| 1517 | /* |
| 1518 | * Truncate the directory that is being deleted. |
| 1519 | */ |
| 1520 | error = detrunc(ip, (u_long)0, IO_SYNC); |
| 1521 | |
| 1522 | vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); |
| 1523 | out: |
| 1524 | return (error); |
| 1525 | } |
| 1526 | |
| 1527 | /* |
| 1528 | * DOS filesystems don't know what symlinks are. |
| 1529 | * |
| 1530 | * msdosfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, |
| 1531 | * struct componentname *a_cnp, struct vattr *a_vap, |
| 1532 | * char *a_target) |
| 1533 | */ |
| 1534 | static int |
| 1535 | msdosfs_symlink(struct vop_old_symlink_args *ap) |
| 1536 | { |
| 1537 | return (EOPNOTSUPP); |
| 1538 | } |
| 1539 | |
| 1540 | /* |
| 1541 | * msdosfs_readdir(struct vnode *a_vp, struct uio *a_uio, |
| 1542 | * struct ucred *a_cred, int *a_eofflag, int *a_ncookies, |
| 1543 | * off_t **a_cookies) |
| 1544 | */ |
| 1545 | static int |
| 1546 | msdosfs_readdir(struct vop_readdir_args *ap) |
| 1547 | { |
| 1548 | struct mbnambuf nb; |
| 1549 | int error = 0; |
| 1550 | int diff; |
| 1551 | long n; |
| 1552 | int blsize; |
| 1553 | long on; |
| 1554 | u_long cn; |
| 1555 | u_long dirsperblk; |
| 1556 | long bias = 0; |
| 1557 | daddr_t bn, lbn; |
| 1558 | struct buf *bp; |
| 1559 | struct denode *dep; |
| 1560 | struct msdosfsmount *pmp; |
| 1561 | struct direntry *dentp; |
| 1562 | struct uio *uio = ap->a_uio; |
| 1563 | off_t *cookies = NULL; |
| 1564 | int ncookies = 0; |
| 1565 | off_t offset, off; |
| 1566 | int chksum = -1; |
| 1567 | ino_t d_ino; |
| 1568 | uint16_t d_namlen; |
| 1569 | uint8_t d_type; |
| 1570 | char *d_name_storage = NULL; |
| 1571 | char *d_name = NULL; |
| 1572 | |
| 1573 | if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0) |
| 1574 | return (error); |
| 1575 | |
| 1576 | dep = VTODE(ap->a_vp); |
| 1577 | pmp = dep->de_pmp; |
| 1578 | |
| 1579 | #ifdef MSDOSFS_DEBUG |
| 1580 | kprintf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", |
| 1581 | ap->a_vp, uio, ap->a_cred, ap->a_eofflag); |
| 1582 | #endif |
| 1583 | |
| 1584 | /* |
| 1585 | * msdosfs_readdir() won't operate properly on regular files since |
| 1586 | * it does i/o only with the the filesystem vnode, and hence can |
| 1587 | * retrieve the wrong block from the buffer cache for a plain file. |
| 1588 | * So, fail attempts to readdir() on a plain file. |
| 1589 | */ |
| 1590 | if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) { |
| 1591 | error = ENOTDIR; |
| 1592 | goto done; |
| 1593 | } |
| 1594 | |
| 1595 | /* |
| 1596 | * If the user buffer is smaller than the size of one dos directory |
| 1597 | * entry or the file offset is not a multiple of the size of a |
| 1598 | * directory entry, then we fail the read. |
| 1599 | */ |
| 1600 | off = offset = uio->uio_offset; |
| 1601 | if (uio->uio_resid < sizeof(struct direntry) || |
| 1602 | (offset & (sizeof(struct direntry) - 1))) { |
| 1603 | error = EINVAL; |
| 1604 | goto done; |
| 1605 | } |
| 1606 | |
| 1607 | if (ap->a_ncookies) { |
| 1608 | ncookies = uio->uio_resid / 16 + 1; |
| 1609 | if (ncookies > 1024) |
| 1610 | ncookies = 1024; |
| 1611 | MALLOC(cookies, off_t *, ncookies * sizeof(off_t), M_TEMP, |
| 1612 | M_WAITOK); |
| 1613 | *ap->a_cookies = cookies; |
| 1614 | *ap->a_ncookies = ncookies; |
| 1615 | } |
| 1616 | |
| 1617 | dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); |
| 1618 | |
| 1619 | /* |
| 1620 | * If they are reading from the root directory then, we simulate |
| 1621 | * the . and .. entries since these don't exist in the root |
| 1622 | * directory. We also set the offset bias to make up for having to |
| 1623 | * simulate these entries. By this I mean that at file offset 64 we |
| 1624 | * read the first entry in the root directory that lives on disk. |
| 1625 | */ |
| 1626 | if (dep->de_StartCluster == MSDOSFSROOT |
| 1627 | || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { |
| 1628 | #if 0 |
| 1629 | kprintf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", |
| 1630 | offset); |
| 1631 | #endif |
| 1632 | bias = 2 * sizeof(struct direntry); |
| 1633 | if (offset < bias) { |
| 1634 | for (n = (int)offset / sizeof(struct direntry); n < 2; |
| 1635 | n++) { |
| 1636 | if (FAT32(pmp)) |
| 1637 | d_ino = xcntobn(pmp, pmp->pm_rootdirblk) |
| 1638 | * dirsperblk; |
| 1639 | else |
| 1640 | d_ino = 1; |
| 1641 | d_type = DT_DIR; |
| 1642 | if (n == 0) { |
| 1643 | d_namlen = 1; |
| 1644 | d_name = "."; |
| 1645 | } else if (n == 1) { |
| 1646 | d_namlen = 2; |
| 1647 | d_name = ".."; |
| 1648 | } |
| 1649 | if (vop_write_dirent(&error, uio, d_ino, d_type, |
| 1650 | d_namlen, d_name)) |
| 1651 | goto out; |
| 1652 | if (error) |
| 1653 | goto out; |
| 1654 | offset += sizeof(struct direntry); |
| 1655 | off = offset; |
| 1656 | if (cookies) { |
| 1657 | *cookies++ = offset; |
| 1658 | if (--ncookies <= 0) |
| 1659 | goto out; |
| 1660 | } |
| 1661 | } |
| 1662 | } |
| 1663 | } |
| 1664 | |
| 1665 | d_name_storage = kmalloc(WIN_MAXLEN, M_TEMP, M_WAITOK); |
| 1666 | mbnambuf_init(&nb); |
| 1667 | off = offset; |
| 1668 | |
| 1669 | while (uio->uio_resid > 0) { |
| 1670 | lbn = de_off2cn(pmp, offset - bias); |
| 1671 | on = (offset - bias) & pmp->pm_crbomask; |
| 1672 | n = min(pmp->pm_bpcluster - on, uio->uio_resid); |
| 1673 | diff = dep->de_FileSize - (offset - bias); |
| 1674 | if (diff <= 0) |
| 1675 | break; |
| 1676 | n = min(n, diff); |
| 1677 | error = pcbmap(dep, lbn, &bn, &cn, &blsize); |
| 1678 | if (error) |
| 1679 | break; |
| 1680 | error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), blsize, &bp); |
| 1681 | if (error) { |
| 1682 | brelse(bp); |
| 1683 | kfree(d_name_storage, M_TEMP); |
| 1684 | goto done; |
| 1685 | } |
| 1686 | n = min(n, blsize - bp->b_resid); |
| 1687 | |
| 1688 | /* |
| 1689 | * Convert from dos directory entries to fs-independent |
| 1690 | * directory entries. |
| 1691 | */ |
| 1692 | for (dentp = (struct direntry *)(bp->b_data + on); |
| 1693 | (char *)dentp < bp->b_data + on + n; |
| 1694 | dentp++, offset += sizeof(struct direntry)) { |
| 1695 | #if 0 |
| 1696 | kprintf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", |
| 1697 | dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); |
| 1698 | #endif |
| 1699 | d_name = d_name_storage; |
| 1700 | d_namlen = 0; |
| 1701 | /* |
| 1702 | * If this is an unused entry, we can stop. |
| 1703 | */ |
| 1704 | if (dentp->deName[0] == SLOT_EMPTY) { |
| 1705 | brelse(bp); |
| 1706 | goto out; |
| 1707 | } |
| 1708 | /* |
| 1709 | * Skip deleted entries. |
| 1710 | */ |
| 1711 | if (dentp->deName[0] == SLOT_DELETED) { |
| 1712 | chksum = -1; |
| 1713 | mbnambuf_init(&nb); |
| 1714 | continue; |
| 1715 | } |
| 1716 | /* |
| 1717 | * Handle Win95 long directory entries |
| 1718 | */ |
| 1719 | if (dentp->deAttributes == ATTR_WIN95) { |
| 1720 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) |
| 1721 | continue; |
| 1722 | chksum = win2unixfn(&nb, |
| 1723 | (struct winentry *)dentp, |
| 1724 | chksum, |
| 1725 | pmp); |
| 1726 | continue; |
| 1727 | } |
| 1728 | |
| 1729 | /* |
| 1730 | * Skip volume labels |
| 1731 | */ |
| 1732 | if (dentp->deAttributes & ATTR_VOLUME) { |
| 1733 | chksum = -1; |
| 1734 | mbnambuf_init(&nb); |
| 1735 | continue; |
| 1736 | } |
| 1737 | /* |
| 1738 | * This computation of d_ino must match |
| 1739 | * the computation of va_fileid in |
| 1740 | * msdosfs_getattr. |
| 1741 | */ |
| 1742 | if (dentp->deAttributes & ATTR_DIRECTORY) { |
| 1743 | d_ino = getushort(dentp->deStartCluster); |
| 1744 | if (FAT32(pmp)) |
| 1745 | d_ino |= getushort(dentp->deHighClust) << 16; |
| 1746 | /* if this is the root directory */ |
| 1747 | if (d_ino != MSDOSFSROOT) |
| 1748 | d_ino = xcntobn(pmp, d_ino) * dirsperblk; |
| 1749 | else if (FAT32(pmp)) |
| 1750 | d_ino = xcntobn(pmp, pmp->pm_rootdirblk) |
| 1751 | * dirsperblk; |
| 1752 | else |
| 1753 | d_ino = 1; |
| 1754 | d_type = DT_DIR; |
| 1755 | } else { |
| 1756 | d_ino = offset / sizeof(struct direntry); |
| 1757 | d_type = DT_REG; |
| 1758 | } |
| 1759 | if (chksum != winChksum(dentp->deName)) { |
| 1760 | d_namlen = dos2unixfn(dentp->deName, |
| 1761 | (u_char *)d_name, |
| 1762 | dentp->deLowerCase | |
| 1763 | ((pmp->pm_flags & MSDOSFSMNT_SHORTNAME) ? |
| 1764 | (LCASE_BASE | LCASE_EXT) : 0), |
| 1765 | pmp); |
| 1766 | mbnambuf_init(&nb); |
| 1767 | } else { |
| 1768 | mbnambuf_flush(&nb, d_name, &d_namlen); |
| 1769 | } |
| 1770 | chksum = -1; |
| 1771 | if (vop_write_dirent(&error, uio, d_ino, d_type, |
| 1772 | d_namlen, d_name)) { |
| 1773 | brelse(bp); |
| 1774 | goto out; |
| 1775 | } |
| 1776 | if (error) { |
| 1777 | brelse(bp); |
| 1778 | goto out; |
| 1779 | } |
| 1780 | |
| 1781 | if (cookies) { |
| 1782 | *cookies++ = offset + sizeof(struct direntry); |
| 1783 | if (--ncookies <= 0) { |
| 1784 | brelse(bp); |
| 1785 | goto out; |
| 1786 | } |
| 1787 | } |
| 1788 | off = offset + sizeof(struct direntry); |
| 1789 | } |
| 1790 | brelse(bp); |
| 1791 | } |
| 1792 | out: |
| 1793 | if (d_name_storage != NULL) |
| 1794 | kfree(d_name_storage, M_TEMP); |
| 1795 | |
| 1796 | /* Subtract unused cookies */ |
| 1797 | if (ap->a_ncookies) |
| 1798 | *ap->a_ncookies -= ncookies; |
| 1799 | |
| 1800 | uio->uio_offset = off; |
| 1801 | |
| 1802 | /* |
| 1803 | * Set the eofflag (NFS uses it) |
| 1804 | */ |
| 1805 | if (ap->a_eofflag) { |
| 1806 | if (dep->de_FileSize - (offset - bias) <= 0) |
| 1807 | *ap->a_eofflag = 1; |
| 1808 | else |
| 1809 | *ap->a_eofflag = 0; |
| 1810 | } |
| 1811 | done: |
| 1812 | vn_unlock(ap->a_vp); |
| 1813 | return (error); |
| 1814 | } |
| 1815 | |
| 1816 | /* |
| 1817 | * vp - address of vnode file the file |
| 1818 | * bn - which cluster we are interested in mapping to a filesystem block number. |
| 1819 | * vpp - returns the vnode for the block special file holding the filesystem |
| 1820 | * containing the file of interest |
| 1821 | * bnp - address of where to return the filesystem relative block number |
| 1822 | * |
| 1823 | * msdosfs_bmap(struct vnode *a_vp, off_t a_loffset, |
| 1824 | * off_t *a_doffsetp, int *a_runp, int *a_runb) |
| 1825 | */ |
| 1826 | static int |
| 1827 | msdosfs_bmap(struct vop_bmap_args *ap) |
| 1828 | { |
| 1829 | struct denode *dep = VTODE(ap->a_vp); |
| 1830 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1831 | daddr_t lbn; |
| 1832 | daddr_t dbn; |
| 1833 | int error; |
| 1834 | |
| 1835 | if (ap->a_doffsetp == NULL) |
| 1836 | return (0); |
| 1837 | if (ap->a_runp) { |
| 1838 | /* |
| 1839 | * Sequential clusters should be counted here. |
| 1840 | */ |
| 1841 | *ap->a_runp = 0; |
| 1842 | } |
| 1843 | if (ap->a_runb) { |
| 1844 | *ap->a_runb = 0; |
| 1845 | } |
| 1846 | KKASSERT(((int)ap->a_loffset & ((1 << pmp->pm_cnshift) - 1)) == 0); |
| 1847 | lbn = de_off2cn(pmp, ap->a_loffset); |
| 1848 | error = pcbmap(dep, lbn, &dbn, NULL, NULL); |
| 1849 | if (error || dbn == (daddr_t)-1) { |
| 1850 | *ap->a_doffsetp = NOOFFSET; |
| 1851 | } else { |
| 1852 | *ap->a_doffsetp = de_bntodoff(pmp, dbn); |
| 1853 | } |
| 1854 | return (error); |
| 1855 | } |
| 1856 | |
| 1857 | /* |
| 1858 | * msdosfs_strategy(struct vnode *a_vp, struct bio *a_bio) |
| 1859 | */ |
| 1860 | static int |
| 1861 | msdosfs_strategy(struct vop_strategy_args *ap) |
| 1862 | { |
| 1863 | struct bio *bio = ap->a_bio; |
| 1864 | struct bio *nbio; |
| 1865 | struct buf *bp = bio->bio_buf; |
| 1866 | struct vnode *vp = ap->a_vp; |
| 1867 | struct denode *dep = VTODE(vp); |
| 1868 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1869 | int error = 0; |
| 1870 | daddr_t dblkno; |
| 1871 | |
| 1872 | if (vp->v_type == VBLK || vp->v_type == VCHR) |
| 1873 | panic("msdosfs_strategy: spec"); |
| 1874 | /* |
| 1875 | * If we don't already know the filesystem relative block number |
| 1876 | * then get it using pcbmap(). If pcbmap() returns the block |
| 1877 | * number as -1 then we've got a hole in the file. DOS filesystems |
| 1878 | * don't allow files with holes, so we shouldn't ever see this. |
| 1879 | */ |
| 1880 | nbio = push_bio(bio); |
| 1881 | if (nbio->bio_offset == NOOFFSET) { |
| 1882 | error = pcbmap(dep, de_off2cn(pmp, bio->bio_offset), |
| 1883 | &dblkno, NULL, NULL); |
| 1884 | if (error) { |
| 1885 | bp->b_error = error; |
| 1886 | bp->b_flags |= B_ERROR; |
| 1887 | /* I/O was never started on nbio, must biodone(bio) */ |
| 1888 | biodone(bio); |
| 1889 | return (error); |
| 1890 | } |
| 1891 | if (dblkno == (daddr_t)-1) { |
| 1892 | nbio->bio_offset = NOOFFSET; |
| 1893 | vfs_bio_clrbuf(bp); |
| 1894 | } else { |
| 1895 | nbio->bio_offset = de_bntodoff(pmp, dblkno); |
| 1896 | } |
| 1897 | } |
| 1898 | if (nbio->bio_offset == NOOFFSET) { |
| 1899 | /* I/O was never started on nbio, must biodone(bio) */ |
| 1900 | biodone(bio); |
| 1901 | return (0); |
| 1902 | } |
| 1903 | /* |
| 1904 | * Read/write the block from/to the disk that contains the desired |
| 1905 | * file block. |
| 1906 | */ |
| 1907 | vn_strategy(dep->de_devvp, nbio); |
| 1908 | return (0); |
| 1909 | } |
| 1910 | |
| 1911 | /* |
| 1912 | * msdosfs_print(struct vnode *vp) |
| 1913 | */ |
| 1914 | static int |
| 1915 | msdosfs_print(struct vop_print_args *ap) |
| 1916 | { |
| 1917 | struct denode *dep = VTODE(ap->a_vp); |
| 1918 | |
| 1919 | kprintf( |
| 1920 | "tag VT_MSDOSFS, startcluster %lu, dircluster %lu, diroffset %lu ", |
| 1921 | dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); |
| 1922 | kprintf(" dev %d, %d", major(dep->de_dev), minor(dep->de_dev)); |
| 1923 | lockmgr_printinfo(&ap->a_vp->v_lock); |
| 1924 | kprintf("\n"); |
| 1925 | return (0); |
| 1926 | } |
| 1927 | |
| 1928 | /* |
| 1929 | * msdosfs_pathconf(struct vnode *a_vp, int a_name, int *a_retval) |
| 1930 | */ |
| 1931 | static int |
| 1932 | msdosfs_pathconf(struct vop_pathconf_args *ap) |
| 1933 | { |
| 1934 | struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; |
| 1935 | |
| 1936 | switch (ap->a_name) { |
| 1937 | case _PC_LINK_MAX: |
| 1938 | *ap->a_retval = 1; |
| 1939 | return (0); |
| 1940 | case _PC_NAME_MAX: |
| 1941 | *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; |
| 1942 | return (0); |
| 1943 | case _PC_PATH_MAX: |
| 1944 | *ap->a_retval = PATH_MAX; |
| 1945 | return (0); |
| 1946 | case _PC_CHOWN_RESTRICTED: |
| 1947 | *ap->a_retval = 1; |
| 1948 | return (0); |
| 1949 | case _PC_NO_TRUNC: |
| 1950 | *ap->a_retval = 0; |
| 1951 | return (0); |
| 1952 | default: |
| 1953 | return (EINVAL); |
| 1954 | } |
| 1955 | /* NOTREACHED */ |
| 1956 | } |
| 1957 | |
| 1958 | /* Global vfs data structures for msdosfs */ |
| 1959 | struct vop_ops msdosfs_vnode_vops = { |
| 1960 | .vop_default = vop_defaultop, |
| 1961 | .vop_access = msdosfs_access, |
| 1962 | .vop_bmap = msdosfs_bmap, |
| 1963 | .vop_old_lookup = msdosfs_lookup, |
| 1964 | .vop_open = msdosfs_open, |
| 1965 | .vop_close = msdosfs_close, |
| 1966 | .vop_old_create = msdosfs_create, |
| 1967 | .vop_fsync = msdosfs_fsync, |
| 1968 | .vop_getattr = msdosfs_getattr, |
| 1969 | .vop_inactive = msdosfs_inactive, |
| 1970 | .vop_old_link = msdosfs_link, |
| 1971 | .vop_old_mkdir = msdosfs_mkdir, |
| 1972 | .vop_old_mknod = msdosfs_mknod, |
| 1973 | .vop_pathconf = msdosfs_pathconf, |
| 1974 | .vop_print = msdosfs_print, |
| 1975 | .vop_read = msdosfs_read, |
| 1976 | .vop_readdir = msdosfs_readdir, |
| 1977 | .vop_reclaim = msdosfs_reclaim, |
| 1978 | .vop_old_remove = msdosfs_remove, |
| 1979 | .vop_old_rename = msdosfs_rename, |
| 1980 | .vop_old_rmdir = msdosfs_rmdir, |
| 1981 | .vop_setattr = msdosfs_setattr, |
| 1982 | .vop_strategy = msdosfs_strategy, |
| 1983 | .vop_old_symlink = msdosfs_symlink, |
| 1984 | .vop_write = msdosfs_write, |
| 1985 | .vop_getpages = vop_stdgetpages, |
| 1986 | .vop_putpages = vop_stdputpages |
| 1987 | }; |