| File: | msdosfs/msdosfs_vnops.c |
| Warning: | line 1369, column 2 Value stored to 'error' is never read |
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| 1 | /* $OpenBSD: msdosfs_vnops.c,v 1.137 2021/12/12 09:14:59 visa Exp $ */ |
| 2 | /* $NetBSD: msdosfs_vnops.c,v 1.63 1997/10/17 11:24:19 ws Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (C) 2005 Thomas Wang. |
| 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/namei.h> |
| 55 | #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ |
| 56 | #include <sys/fcntl.h> /* define FWRITE ... */ |
| 57 | #include <sys/file.h> |
| 58 | #include <sys/stat.h> |
| 59 | #include <sys/buf.h> |
| 60 | #include <sys/proc.h> |
| 61 | #include <sys/mount.h> |
| 62 | #include <sys/vnode.h> |
| 63 | #include <sys/lock.h> |
| 64 | #include <sys/signalvar.h> |
| 65 | #include <sys/specdev.h> /* XXX */ /* defines v_rdev */ |
| 66 | #include <sys/malloc.h> |
| 67 | #include <sys/pool.h> |
| 68 | #include <sys/dirent.h> /* defines dirent structure */ |
| 69 | #include <sys/lockf.h> |
| 70 | #include <sys/poll.h> |
| 71 | #include <sys/unistd.h> |
| 72 | |
| 73 | #include <msdosfs/bpb.h> |
| 74 | #include <msdosfs/direntry.h> |
| 75 | #include <msdosfs/denode.h> |
| 76 | #include <msdosfs/msdosfsmount.h> |
| 77 | #include <msdosfs/fat.h> |
| 78 | |
| 79 | static uint32_t fileidhash(uint64_t); |
| 80 | |
| 81 | int msdosfs_bmaparray(struct vnode *, uint32_t, daddr_t *, int *); |
| 82 | int msdosfs_kqfilter(void *); |
| 83 | int filt_msdosfsread(struct knote *, long); |
| 84 | int filt_msdosfswrite(struct knote *, long); |
| 85 | int filt_msdosfsvnode(struct knote *, long); |
| 86 | void filt_msdosfsdetach(struct knote *); |
| 87 | |
| 88 | /* |
| 89 | * Some general notes: |
| 90 | * |
| 91 | * In the ufs filesystem the inodes, superblocks, and indirect blocks are |
| 92 | * read/written using the vnode for the filesystem. Blocks that represent |
| 93 | * the contents of a file are read/written using the vnode for the file |
| 94 | * (including directories when they are read/written as files). This |
| 95 | * presents problems for the dos filesystem because data that should be in |
| 96 | * an inode (if dos had them) resides in the directory itself. Since we |
| 97 | * must update directory entries without the benefit of having the vnode |
| 98 | * for the directory we must use the vnode for the filesystem. This means |
| 99 | * that when a directory is actually read/written (via read, write, or |
| 100 | * readdir, or seek) we must use the vnode for the filesystem instead of |
| 101 | * the vnode for the directory as would happen in ufs. This is to insure we |
| 102 | * retrieve the correct block from the buffer cache since the hash value is |
| 103 | * based upon the vnode address and the desired block number. |
| 104 | */ |
| 105 | |
| 106 | /* |
| 107 | * Create a regular file. On entry the directory to contain the file being |
| 108 | * created is locked. We must release before we return. We must also free |
| 109 | * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or |
| 110 | * only if the SAVESTART bit in cn_flags is clear on success. |
| 111 | */ |
| 112 | int |
| 113 | msdosfs_create(void *v) |
| 114 | { |
| 115 | struct vop_create_args *ap = v; |
| 116 | struct componentname *cnp = ap->a_cnp; |
| 117 | struct denode ndirent; |
| 118 | struct denode *dep; |
| 119 | struct denode *pdep = VTODE(ap->a_dvp)((struct denode *)(ap->a_dvp)->v_data); |
| 120 | int error; |
| 121 | struct timespec ts; |
| 122 | |
| 123 | #ifdef MSDOSFS_DEBUG |
| 124 | printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); |
| 125 | #endif |
| 126 | |
| 127 | /* |
| 128 | * If this is the root directory and there is no space left we |
| 129 | * can't do anything. This is because the root directory can not |
| 130 | * change size. |
| 131 | */ |
| 132 | if (pdep->de_StartCluster == MSDOSFSROOT0 |
| 133 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
| 134 | error = ENOSPC28; |
| 135 | goto bad; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Create a directory entry for the file, then call createde() to |
| 140 | * have it installed. NOTE: DOS files are always executable. We |
| 141 | * use the absence of the owner write bit to make the file |
| 142 | * readonly. |
| 143 | */ |
| 144 | #ifdef DIAGNOSTIC1 |
| 145 | if ((cnp->cn_flags & HASBUF0x000400) == 0) |
| 146 | panic("msdosfs_create: no name"); |
| 147 | #endif |
| 148 | bzero(&ndirent, sizeof(ndirent))__builtin_bzero((&ndirent), (sizeof(ndirent))); |
| 149 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
| 150 | goto bad; |
| 151 | |
| 152 | ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE00200) ? |
| 153 | ATTR_ARCHIVE0x20 : ATTR_ARCHIVE0x20 | ATTR_READONLY0x01; |
| 154 | ndirent.de_StartCluster = 0; |
| 155 | ndirent.de_FileSize = 0; |
| 156 | ndirent.de_dev = pdep->de_dev; |
| 157 | ndirent.de_devvp = pdep->de_devvp; |
| 158 | ndirent.de_pmp = pdep->de_pmp; |
| 159 | ndirent.de_flag = DE_ACCESS0x0010 | DE_CREATE0x0008 | DE_UPDATE0x0004; |
| 160 | getnanotime(&ts); |
| 161 | DETIMES(&ndirent, &ts, &ts, &ts)if ((&ndirent)->de_flag & (0x0004 | 0x0008 | 0x0010 )) { (&ndirent)->de_flag |= 0x0020; if ((&ndirent) ->de_flag & 0x0004) { unix2dostime((&ts), &(& ndirent)->de_MDate, &(&ndirent)->de_MTime, ((void *)0)); (&ndirent)->de_Attributes |= 0x20; } if (!((& ndirent)->de_pmp->pm_flags & 0x04)) { if ((&ndirent )->de_flag & 0x0010) unix2dostime((&ts), &(& ndirent)->de_ADate, ((void *)0), ((void *)0)); if ((&ndirent )->de_flag & 0x0008) unix2dostime((&ts), &(& ndirent)->de_CDate, &(&ndirent)->de_CTime, & (&ndirent)->de_CTimeHundredth); } (&ndirent)->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
| 162 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
| 163 | goto bad; |
| 164 | if ((cnp->cn_flags & SAVESTART0x001000) == 0) |
| 165 | pool_put(&namei_pool, cnp->cn_pnbuf); |
| 166 | VN_KNOTE(ap->a_dvp, NOTE_WRITE)do { struct klist *__list = (&ap->a_dvp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0002)) ; } while (0); |
| 167 | *ap->a_vpp = DETOV(dep)((dep)->de_vnode); |
| 168 | return (0); |
| 169 | |
| 170 | bad: |
| 171 | pool_put(&namei_pool, cnp->cn_pnbuf); |
| 172 | return (error); |
| 173 | } |
| 174 | |
| 175 | int |
| 176 | msdosfs_mknod(void *v) |
| 177 | { |
| 178 | struct vop_mknod_args *ap = v; |
| 179 | |
| 180 | pool_put(&namei_pool, ap->a_cnp->cn_pnbuf); |
| 181 | VN_KNOTE(ap->a_dvp, NOTE_WRITE)do { struct klist *__list = (&ap->a_dvp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0002)) ; } while (0); |
| 182 | return (EINVAL22); |
| 183 | } |
| 184 | |
| 185 | int |
| 186 | msdosfs_open(void *v) |
| 187 | { |
| 188 | return (0); |
| 189 | } |
| 190 | |
| 191 | int |
| 192 | msdosfs_close(void *v) |
| 193 | { |
| 194 | struct vop_close_args *ap = v; |
| 195 | struct vnode *vp = ap->a_vp; |
| 196 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 197 | struct timespec ts; |
| 198 | |
| 199 | if (vp->v_usecount > 1 && !VOP_ISLOCKED(vp)) { |
| 200 | getnanotime(&ts); |
| 201 | DETIMES(dep, &ts, &ts, &ts)if ((dep)->de_flag & (0x0004 | 0x0008 | 0x0010)) { (dep )->de_flag |= 0x0020; if ((dep)->de_flag & 0x0004) { unix2dostime((&ts), &(dep)->de_MDate, &(dep)-> de_MTime, ((void *)0)); (dep)->de_Attributes |= 0x20; } if (!((dep)->de_pmp->pm_flags & 0x04)) { if ((dep)-> de_flag & 0x0010) unix2dostime((&ts), &(dep)-> de_ADate, ((void *)0), ((void *)0)); if ((dep)->de_flag & 0x0008) unix2dostime((&ts), &(dep)->de_CDate, & (dep)->de_CTime, &(dep)->de_CTimeHundredth); } (dep )->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
| 202 | } |
| 203 | return (0); |
| 204 | } |
| 205 | |
| 206 | int |
| 207 | msdosfs_access(void *v) |
| 208 | { |
| 209 | struct vop_access_args *ap = v; |
| 210 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 211 | struct msdosfsmount *pmp = dep->de_pmp; |
| 212 | mode_t dosmode; |
| 213 | |
| 214 | dosmode = (S_IRUSR0000400 | S_IRGRP0000040 | S_IROTH0000004); |
| 215 | if ((dep->de_Attributes & ATTR_READONLY0x01) == 0) |
| 216 | dosmode |= (S_IWUSR0000200 | S_IWGRP0000020 | S_IWOTH0000002); |
| 217 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) |
| 218 | dosmode |= (S_IXUSR0000100 | S_IXGRP0000010 | S_IXOTH0000001); |
| 219 | dosmode &= pmp->pm_mask; |
| 220 | |
| 221 | return (vaccess(ap->a_vp->v_type, dosmode, pmp->pm_uid, pmp->pm_gid, |
| 222 | ap->a_mode, ap->a_cred)); |
| 223 | } |
| 224 | |
| 225 | int |
| 226 | msdosfs_getattr(void *v) |
| 227 | { |
| 228 | struct vop_getattr_args *ap = v; |
| 229 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 230 | struct msdosfsmount *pmp = dep->de_pmp; |
| 231 | struct vattr *vap = ap->a_vap; |
| 232 | struct timespec ts; |
| 233 | uint32_t fileid; |
| 234 | |
| 235 | getnanotime(&ts); |
| 236 | DETIMES(dep, &ts, &ts, &ts)if ((dep)->de_flag & (0x0004 | 0x0008 | 0x0010)) { (dep )->de_flag |= 0x0020; if ((dep)->de_flag & 0x0004) { unix2dostime((&ts), &(dep)->de_MDate, &(dep)-> de_MTime, ((void *)0)); (dep)->de_Attributes |= 0x20; } if (!((dep)->de_pmp->pm_flags & 0x04)) { if ((dep)-> de_flag & 0x0010) unix2dostime((&ts), &(dep)-> de_ADate, ((void *)0), ((void *)0)); if ((dep)->de_flag & 0x0008) unix2dostime((&ts), &(dep)->de_CDate, & (dep)->de_CTime, &(dep)->de_CTimeHundredth); } (dep )->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
| 237 | vap->va_fsid = dep->de_dev; |
| 238 | |
| 239 | /* |
| 240 | * The following computation of the fileid must be the same as |
| 241 | * that used in msdosfs_readdir() to compute d_fileno. If not, |
| 242 | * pwd doesn't work. |
| 243 | * |
| 244 | * We now use the starting cluster number as the fileid/fileno. |
| 245 | * This works for both files and directories (including the root |
| 246 | * directory, on FAT32). Even on FAT32, this will at most be a |
| 247 | * 28-bit number, as the high 4 bits of FAT32 cluster numbers |
| 248 | * are reserved. |
| 249 | * |
| 250 | * However, we do need to do something for 0-length files, which |
| 251 | * will not have a starting cluster number. |
| 252 | * |
| 253 | * These files cannot be directories, since (except for /, which |
| 254 | * is special-cased anyway) directories contain entries for . and |
| 255 | * .., so must have non-zero length. |
| 256 | * |
| 257 | * In this case, we just create a non-cryptographic hash of the |
| 258 | * original fileid calculation, and set the top bit. |
| 259 | * |
| 260 | * This algorithm has the benefit that all directories, and all |
| 261 | * non-zero-length files, will have fileids that are persistent |
| 262 | * across mounts and reboots, and that cannot collide (as long |
| 263 | * as the filesystem is not corrupt). Zero-length files will |
| 264 | * have fileids that are persistent, but that may collide. We |
| 265 | * will just have to live with that. |
| 266 | */ |
| 267 | fileid = dep->de_StartCluster; |
| 268 | |
| 269 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) { |
| 270 | /* Special-case root */ |
| 271 | if (dep->de_StartCluster == MSDOSFSROOT0) |
| 272 | fileid = FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) ? pmp->pm_rootdirblk : 1; |
| 273 | } else { |
| 274 | if (dep->de_FileSize == 0) { |
| 275 | uint32_t dirsperblk; |
| 276 | uint64_t fileid64; |
| 277 | |
| 278 | dirsperblk = pmp->pm_BytesPerSecpm_bpb.bpbBytesPerSec / |
| 279 | sizeof(struct direntry); |
| 280 | |
| 281 | fileid64 = (dep->de_dirclust == MSDOSFSROOT0) ? |
| 282 | roottobn(pmp, 0)((((((((0))) >> (((pmp)))->pm_cnshift)) << ((( pmp))->pm_cnshift - ((pmp))->pm_bnshift))) + (pmp)-> pm_rootdirblk) : cntobn(pmp, dep->de_dirclust)((((dep->de_dirclust)-2) << (((pmp))->pm_cnshift - ((pmp))->pm_bnshift)) + (pmp)->pm_firstcluster); |
| 283 | fileid64 *= dirsperblk; |
| 284 | fileid64 += dep->de_diroffset / sizeof(struct direntry); |
| 285 | |
| 286 | fileid = fileidhash(fileid64); |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | vap->va_fileid = fileid; |
| 291 | vap->va_mode = (S_IRUSR0000400|S_IRGRP0000040|S_IROTH0000004); |
| 292 | if ((dep->de_Attributes & ATTR_READONLY0x01) == 0) |
| 293 | vap->va_mode |= (S_IWUSR0000200|S_IWGRP0000020|S_IWOTH0000002); |
| 294 | if (dep->de_Attributes & ATTR_DIRECTORY0x10) { |
| 295 | vap->va_mode |= S_IFDIR0040000; |
| 296 | vap->va_mode |= (vap->va_mode & S_IRUSR0000400) ? S_IXUSR0000100 : 0; |
| 297 | vap->va_mode |= (vap->va_mode & S_IRGRP0000040) ? S_IXGRP0000010 : 0; |
| 298 | vap->va_mode |= (vap->va_mode & S_IROTH0000004) ? S_IXOTH0000001 : 0; |
| 299 | } |
| 300 | vap->va_mode &= dep->de_pmp->pm_mask; |
| 301 | vap->va_nlink = 1; |
| 302 | vap->va_gid = dep->de_pmp->pm_gid; |
| 303 | vap->va_uid = dep->de_pmp->pm_uid; |
| 304 | vap->va_rdev = 0; |
| 305 | vap->va_size = dep->de_FileSize; |
| 306 | dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); |
| 307 | if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME0x02) { |
| 308 | dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); |
| 309 | dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CTimeHundredth, &vap->va_ctime); |
| 310 | } else { |
| 311 | vap->va_atime = vap->va_mtime; |
| 312 | vap->va_ctime = vap->va_mtime; |
| 313 | } |
| 314 | vap->va_flags = 0; |
| 315 | if ((dep->de_Attributes & ATTR_ARCHIVE0x20) == 0) |
| 316 | vap->va_flags |= SF_ARCHIVED0x00010000; |
| 317 | vap->va_gen = 0; |
| 318 | vap->va_blocksize = dep->de_pmp->pm_bpcluster; |
| 319 | vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) & |
| 320 | ~(dep->de_pmp->pm_crbomask); |
| 321 | vap->va_type = ap->a_vp->v_type; |
| 322 | return (0); |
| 323 | } |
| 324 | |
| 325 | int |
| 326 | msdosfs_setattr(void *v) |
| 327 | { |
| 328 | struct vop_setattr_args *ap = v; |
| 329 | struct vnode *vp = ap->a_vp; |
| 330 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 331 | struct msdosfsmount *pmp = dep->de_pmp; |
| 332 | struct vattr *vap = ap->a_vap; |
| 333 | struct ucred *cred = ap->a_cred; |
| 334 | int error = 0; |
| 335 | |
| 336 | #ifdef MSDOSFS_DEBUG |
| 337 | printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", |
| 338 | ap->a_vp, vap, cred, ap->a_p); |
| 339 | #endif |
| 340 | if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL(-1)) || |
| 341 | (vap->va_fsid != VNOVAL(-1)) || (vap->va_fileid != VNOVAL(-1)) || |
| 342 | (vap->va_blocksize != VNOVAL(-1)) || (vap->va_rdev != VNOVAL(-1)) || |
| 343 | (vap->va_bytes != VNOVAL(-1)) || (vap->va_gen != VNOVAL(-1))) { |
| 344 | #ifdef MSDOSFS_DEBUG |
| 345 | printf("msdosfs_setattr(): returning EINVAL\n"); |
| 346 | printf(" va_type %d, va_nlink %x, va_fsid %ld, " |
| 347 | "va_fileid %llx\n", vap->va_type, vap->va_nlink, |
| 348 | vap->va_fsid, (unsigned long long)vap->va_fileid); |
| 349 | printf(" va_blocksize %lx, va_rdev %x, va_bytes %llx, " |
| 350 | "va_gen %lx\n", vap->va_blocksize, |
| 351 | (unsigned int)vap->va_rdev, |
| 352 | (unsigned long long)vap->va_bytes, vap->va_gen); |
| 353 | #endif |
| 354 | return (EINVAL22); |
| 355 | } |
| 356 | if (vap->va_flags != VNOVAL(-1)) { |
| 357 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
| 358 | return (EINVAL22); |
| 359 | if (cred->cr_uid != pmp->pm_uid) { |
| 360 | error = suser_ucred(cred); |
| 361 | if (error) |
| 362 | return (error); |
| 363 | } |
| 364 | /* |
| 365 | * We are very inconsistent about handling unsupported |
| 366 | * attributes. We ignored the access time and the |
| 367 | * read and execute bits. We were strict for the other |
| 368 | * attributes. |
| 369 | * |
| 370 | * Here we are strict, stricter than ufs in not allowing |
| 371 | * users to attempt to set SF_SETTABLE bits or anyone to |
| 372 | * set unsupported bits. However, we ignore attempts to |
| 373 | * set ATTR_ARCHIVE for directories `cp -pr' from a more |
| 374 | * sensible filesystem attempts it a lot. |
| 375 | */ |
| 376 | if (vap->va_flags & SF_SETTABLE0xffff0000) { |
| 377 | error = suser_ucred(cred); |
| 378 | if (error) |
| 379 | return (error); |
| 380 | } |
| 381 | if (vap->va_flags & ~SF_ARCHIVED0x00010000) |
| 382 | return EOPNOTSUPP45; |
| 383 | if (vap->va_flags & SF_ARCHIVED0x00010000) |
| 384 | dep->de_Attributes &= ~ATTR_ARCHIVE0x20; |
| 385 | else if (!(dep->de_Attributes & ATTR_DIRECTORY0x10)) |
| 386 | dep->de_Attributes |= ATTR_ARCHIVE0x20; |
| 387 | dep->de_flag |= DE_MODIFIED0x0020; |
| 388 | } |
| 389 | |
| 390 | if (vap->va_uid != (uid_t)VNOVAL(-1) || vap->va_gid != (gid_t)VNOVAL(-1)) { |
| 391 | uid_t uid; |
| 392 | gid_t gid; |
| 393 | |
| 394 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
| 395 | return (EINVAL22); |
| 396 | uid = vap->va_uid; |
| 397 | if (uid == (uid_t)VNOVAL(-1)) |
| 398 | uid = pmp->pm_uid; |
| 399 | gid = vap->va_gid; |
| 400 | if (gid == (gid_t)VNOVAL(-1)) |
| 401 | gid = pmp->pm_gid; |
| 402 | if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || |
| 403 | (gid != pmp->pm_gid && !groupmember(gid, cred))) { |
| 404 | error = suser_ucred(cred); |
| 405 | if (error) |
| 406 | return (error); |
| 407 | } |
| 408 | if (uid != pmp->pm_uid || gid != pmp->pm_gid) |
| 409 | return EINVAL22; |
| 410 | } |
| 411 | |
| 412 | if (vap->va_size != VNOVAL(-1)) { |
| 413 | switch (vp->v_type) { |
| 414 | case VDIR: |
| 415 | return (EISDIR21); |
| 416 | case VREG: |
| 417 | /* |
| 418 | * Truncation is only supported for regular files, |
| 419 | * Disallow it if the filesystem is read-only. |
| 420 | */ |
| 421 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
| 422 | return (EINVAL22); |
| 423 | break; |
| 424 | default: |
| 425 | /* |
| 426 | * According to POSIX, the result is unspecified |
| 427 | * for file types other than regular files, |
| 428 | * directories and shared memory objects. We |
| 429 | * don't support any file types except regular |
| 430 | * files and directories in this file system, so |
| 431 | * this (default) case is unreachable and can do |
| 432 | * anything. Keep falling through to detrunc() |
| 433 | * for now. |
| 434 | */ |
| 435 | break; |
| 436 | } |
| 437 | error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); |
| 438 | if (error) |
| 439 | return error; |
| 440 | } |
| 441 | if ((vap->va_vaflags & VA_UTIMES_CHANGE0x04) || |
| 442 | vap->va_atime.tv_nsec != VNOVAL(-1) || |
| 443 | vap->va_mtime.tv_nsec != VNOVAL(-1)) { |
| 444 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
| 445 | return (EINVAL22); |
| 446 | if (cred->cr_uid != pmp->pm_uid && |
| 447 | (error = suser_ucred(cred)) && |
| 448 | ((vap->va_vaflags & VA_UTIMES_NULL0x01) == 0 || |
| 449 | (error = VOP_ACCESS(ap->a_vp, VWRITE00200, cred, ap->a_p)))) |
| 450 | return (error); |
| 451 | if (vp->v_type != VDIR) { |
| 452 | if ((pmp->pm_flags & MSDOSFSMNT_NOWIN950x04) == 0 && |
| 453 | vap->va_atime.tv_nsec != VNOVAL(-1)) { |
| 454 | dep->de_flag &= ~DE_ACCESS0x0010; |
| 455 | unix2dostime(&vap->va_atime, &dep->de_ADate, |
| 456 | NULL((void *)0), NULL((void *)0)); |
| 457 | } |
| 458 | if (vap->va_mtime.tv_nsec != VNOVAL(-1)) { |
| 459 | dep->de_flag &= ~DE_UPDATE0x0004; |
| 460 | unix2dostime(&vap->va_mtime, &dep->de_MDate, |
| 461 | &dep->de_MTime, NULL((void *)0)); |
| 462 | } |
| 463 | dep->de_Attributes |= ATTR_ARCHIVE0x20; |
| 464 | dep->de_flag |= DE_MODIFIED0x0020; |
| 465 | } |
| 466 | } |
| 467 | /* |
| 468 | * DOS files only have the ability to have their writability |
| 469 | * attribute set, so we use the owner write bit to set the readonly |
| 470 | * attribute. |
| 471 | */ |
| 472 | if (vap->va_mode != (mode_t)VNOVAL(-1)) { |
| 473 | if (vp->v_mount->mnt_flag & MNT_RDONLY0x00000001) |
| 474 | return (EINVAL22); |
| 475 | if (cred->cr_uid != pmp->pm_uid) { |
| 476 | error = suser_ucred(cred); |
| 477 | if (error) |
| 478 | return (error); |
| 479 | } |
| 480 | if (vp->v_type != VDIR) { |
| 481 | /* We ignore the read and execute bits. */ |
| 482 | if (vap->va_mode & VWRITE00200) |
| 483 | dep->de_Attributes &= ~ATTR_READONLY0x01; |
| 484 | else |
| 485 | dep->de_Attributes |= ATTR_READONLY0x01; |
| 486 | dep->de_Attributes |= ATTR_ARCHIVE0x20; |
| 487 | dep->de_flag |= DE_MODIFIED0x0020; |
| 488 | } |
| 489 | } |
| 490 | VN_KNOTE(ap->a_vp, NOTE_ATTRIB)do { struct klist *__list = (&ap->a_vp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0008)) ; } while (0); |
| 491 | return (deupdat(dep, 1)); |
| 492 | } |
| 493 | |
| 494 | int |
| 495 | msdosfs_read(void *v) |
| 496 | { |
| 497 | struct vop_read_args *ap = v; |
| 498 | struct vnode *vp = ap->a_vp; |
| 499 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 500 | struct msdosfsmount *pmp = dep->de_pmp; |
| 501 | struct uio *uio = ap->a_uio; |
| 502 | int isadir, error = 0; |
| 503 | uint32_t n, diff, size, on; |
| 504 | struct buf *bp; |
| 505 | uint32_t cn; |
| 506 | daddr_t bn; |
| 507 | |
| 508 | /* |
| 509 | * If they didn't ask for any data, then we are done. |
| 510 | */ |
| 511 | if (uio->uio_resid == 0) |
| 512 | return (0); |
| 513 | if (uio->uio_offset < 0) |
| 514 | return (EINVAL22); |
| 515 | |
| 516 | isadir = dep->de_Attributes & ATTR_DIRECTORY0x10; |
| 517 | do { |
| 518 | if (uio->uio_offset >= dep->de_FileSize) |
| 519 | return (0); |
| 520 | |
| 521 | cn = de_cluster(pmp, uio->uio_offset)((uio->uio_offset) >> (pmp)->pm_cnshift); |
| 522 | size = pmp->pm_bpcluster; |
| 523 | on = uio->uio_offset & pmp->pm_crbomask; |
| 524 | n = ulmin(pmp->pm_bpcluster - on, uio->uio_resid); |
| 525 | |
| 526 | /* |
| 527 | * de_FileSize is uint32_t, and we know that uio_offset < |
| 528 | * de_FileSize, so uio->uio_offset < 2^32. Therefore |
| 529 | * the cast to uint32_t on the next line is safe. |
| 530 | */ |
| 531 | diff = dep->de_FileSize - (uint32_t)uio->uio_offset; |
| 532 | if (diff < n) |
| 533 | n = diff; |
| 534 | |
| 535 | /* |
| 536 | * If we are operating on a directory file then be sure to |
| 537 | * do i/o with the vnode for the filesystem instead of the |
| 538 | * vnode for the directory. |
| 539 | */ |
| 540 | if (isadir) { |
| 541 | /* convert cluster # to block # */ |
| 542 | error = pcbmap(dep, cn, &bn, 0, &size); |
| 543 | if (error) |
| 544 | return (error); |
| 545 | error = bread(pmp->pm_devvp, bn, size, &bp); |
| 546 | } else { |
| 547 | if (de_cn2off(pmp, cn + 1)((cn + 1) << (pmp)->pm_cnshift) >= dep->de_FileSize) |
| 548 | error = bread(vp, cn, size, &bp); |
| 549 | else |
| 550 | error = bread_cluster(vp, cn, size, &bp); |
| 551 | } |
| 552 | n = min(n, pmp->pm_bpcluster - bp->b_resid); |
| 553 | if (error) { |
| 554 | brelse(bp); |
| 555 | return (error); |
| 556 | } |
| 557 | error = uiomove(bp->b_data + on, n, uio); |
| 558 | brelse(bp); |
| 559 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
| 560 | if (!isadir && !(vp->v_mount->mnt_flag & MNT_NOATIME0x00008000)) |
| 561 | dep->de_flag |= DE_ACCESS0x0010; |
| 562 | return (error); |
| 563 | } |
| 564 | |
| 565 | /* |
| 566 | * Write data to a file or directory. |
| 567 | */ |
| 568 | int |
| 569 | msdosfs_write(void *v) |
| 570 | { |
| 571 | struct vop_write_args *ap = v; |
| 572 | uint32_t n, croffset; |
| 573 | size_t resid; |
| 574 | ssize_t overrun; |
| 575 | int extended = 0; |
| 576 | uint32_t osize; |
| 577 | int error = 0; |
| 578 | uint32_t count, lastcn, cn; |
| 579 | struct buf *bp; |
| 580 | int ioflag = ap->a_ioflag; |
| 581 | struct uio *uio = ap->a_uio; |
| 582 | struct vnode *vp = ap->a_vp; |
| 583 | struct vnode *thisvp; |
| 584 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 585 | struct msdosfsmount *pmp = dep->de_pmp; |
| 586 | struct ucred *cred = ap->a_cred; |
| 587 | |
| 588 | #ifdef MSDOSFS_DEBUG |
| 589 | printf("msdosfs_write(vp %p, uio %p, ioflag %08x, cred %p\n", |
| 590 | vp, uio, ioflag, cred); |
| 591 | printf("msdosfs_write(): diroff %d, dirclust %d, startcluster %d\n", |
| 592 | dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); |
| 593 | #endif |
| 594 | |
| 595 | switch (vp->v_type) { |
| 596 | case VREG: |
| 597 | if (ioflag & IO_APPEND0x02) |
| 598 | uio->uio_offset = dep->de_FileSize; |
| 599 | thisvp = vp; |
| 600 | break; |
| 601 | case VDIR: |
| 602 | return EISDIR21; |
| 603 | default: |
| 604 | panic("msdosfs_write(): bad file type"); |
| 605 | } |
| 606 | |
| 607 | if (uio->uio_offset < 0) |
| 608 | return (EINVAL22); |
| 609 | |
| 610 | if (uio->uio_resid == 0) |
| 611 | return (0); |
| 612 | |
| 613 | /* Don't bother to try to write files larger than the f/s limit */ |
| 614 | if (uio->uio_offset > MSDOSFS_FILESIZE_MAX0xFFFFFFFFLL || |
| 615 | uio->uio_resid > (MSDOSFS_FILESIZE_MAX0xFFFFFFFFLL - uio->uio_offset)) |
| 616 | return (EFBIG27); |
| 617 | |
| 618 | /* do the filesize rlimit check */ |
| 619 | if ((error = vn_fsizechk(vp, uio, ioflag, &overrun))) |
| 620 | return (error); |
| 621 | |
| 622 | /* |
| 623 | * If the offset we are starting the write at is beyond the end of |
| 624 | * the file, then they've done a seek. Unix filesystems allow |
| 625 | * files with holes in them, DOS doesn't so we must fill the hole |
| 626 | * with zeroed blocks. |
| 627 | */ |
| 628 | if (uio->uio_offset > dep->de_FileSize) { |
| 629 | if ((error = deextend(dep, uio->uio_offset, cred)) != 0) |
| 630 | goto out; |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * Remember some values in case the write fails. |
| 635 | */ |
| 636 | resid = uio->uio_resid; |
| 637 | osize = dep->de_FileSize; |
| 638 | |
| 639 | /* |
| 640 | * If we write beyond the end of the file, extend it to its ultimate |
| 641 | * size ahead of the time to hopefully get a contiguous area. |
| 642 | */ |
| 643 | if (uio->uio_offset + resid > osize) { |
| 644 | extended = 1; |
| 645 | count = de_clcount(pmp, uio->uio_offset + resid)(((uio->uio_offset + resid) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift) - |
| 646 | de_clcount(pmp, osize)(((osize) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ); |
| 647 | if ((error = extendfile(dep, count, NULL((void *)0), NULL((void *)0), 0)) && |
| 648 | (error != ENOSPC28 || (ioflag & IO_UNIT0x01))) |
| 649 | goto errexit; |
| 650 | lastcn = dep->de_fc[FC_LASTFC1].fc_frcn; |
| 651 | } else |
| 652 | lastcn = de_clcount(pmp, osize)(((osize) + (pmp)->pm_bpcluster - 1) >> (pmp)->pm_cnshift ) - 1; |
| 653 | |
| 654 | do { |
| 655 | croffset = uio->uio_offset & pmp->pm_crbomask; |
| 656 | cn = de_cluster(pmp, uio->uio_offset)((uio->uio_offset) >> (pmp)->pm_cnshift); |
| 657 | |
| 658 | if (cn > lastcn) { |
| 659 | error = ENOSPC28; |
| 660 | break; |
| 661 | } |
| 662 | |
| 663 | if (croffset == 0 && |
| 664 | (de_cluster(pmp, uio->uio_offset + uio->uio_resid)((uio->uio_offset + uio->uio_resid) >> (pmp)-> pm_cnshift) > cn || |
| 665 | (uio->uio_offset + uio->uio_resid) >= dep->de_FileSize)) { |
| 666 | /* |
| 667 | * If either the whole cluster gets written, |
| 668 | * or we write the cluster from its start beyond EOF, |
| 669 | * then no need to read data from disk. |
| 670 | */ |
| 671 | bp = getblk(thisvp, cn, pmp->pm_bpcluster, 0, INFSLP0xffffffffffffffffULL); |
| 672 | clrbuf(bp){ __builtin_bzero(((bp)->b_data), ((bp)->b_bcount)); (bp )->b_resid = 0; }; |
| 673 | /* |
| 674 | * Do the bmap now, since pcbmap needs buffers |
| 675 | * for the fat table. (see msdosfs_strategy) |
| 676 | */ |
| 677 | if (bp->b_blkno == bp->b_lblkno) { |
| 678 | error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); |
| 679 | if (error) |
| 680 | bp->b_blkno = -1; |
| 681 | } |
| 682 | if (bp->b_blkno == -1) { |
| 683 | brelse(bp); |
| 684 | if (!error) |
| 685 | error = EIO5; /* XXX */ |
| 686 | break; |
| 687 | } |
| 688 | } else { |
| 689 | /* |
| 690 | * The block we need to write into exists, so |
| 691 | * read it in. |
| 692 | */ |
| 693 | error = bread(thisvp, cn, pmp->pm_bpcluster, &bp); |
| 694 | if (error) { |
| 695 | brelse(bp); |
| 696 | break; |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | n = ulmin(uio->uio_resid, pmp->pm_bpcluster - croffset); |
| 701 | if (uio->uio_offset + n > dep->de_FileSize) { |
| 702 | dep->de_FileSize = uio->uio_offset + n; |
| 703 | uvm_vnp_setsize(vp, dep->de_FileSize); |
| 704 | } |
| 705 | uvm_vnp_uncache(vp); |
| 706 | /* |
| 707 | * Should these vnode_pager_* functions be done on dir |
| 708 | * files? |
| 709 | */ |
| 710 | |
| 711 | /* |
| 712 | * Copy the data from user space into the buf header. |
| 713 | */ |
| 714 | error = uiomove(bp->b_data + croffset, n, uio); |
| 715 | |
| 716 | /* |
| 717 | * If they want this synchronous then write it and wait for |
| 718 | * it. Otherwise, if on a cluster boundary write it |
| 719 | * asynchronously so we can move on to the next block |
| 720 | * without delay. Otherwise do a delayed write because we |
| 721 | * may want to write somemore into the block later. |
| 722 | */ |
| 723 | #if 0 |
| 724 | if (ioflag & IO_NOCACHE0x40) |
| 725 | bp->b_flags |= B_NOCACHE0x00001000; |
| 726 | #endif |
| 727 | if (ioflag & IO_SYNC0x04) |
| 728 | (void) bwrite(bp); |
| 729 | else if (n + croffset == pmp->pm_bpcluster) |
| 730 | bawrite(bp); |
| 731 | else |
| 732 | bdwrite(bp); |
| 733 | dep->de_flag |= DE_UPDATE0x0004; |
| 734 | } while (error == 0 && uio->uio_resid > 0); |
| 735 | |
| 736 | if (resid > uio->uio_resid) |
| 737 | VN_KNOTE(ap->a_vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0))do { struct klist *__list = (&ap->a_vp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0002 | (extended ? 0x0004 : 0))); } while (0); |
| 738 | |
| 739 | if (dep->de_FileSize < osize) |
| 740 | VN_KNOTE(ap->a_vp, NOTE_TRUNCATE)do { struct klist *__list = (&ap->a_vp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0080)) ; } while (0); |
| 741 | |
| 742 | /* |
| 743 | * If the write failed and they want us to, truncate the file back |
| 744 | * to the size it was before the write was attempted. |
| 745 | */ |
| 746 | errexit: |
| 747 | if (error) { |
| 748 | if (ioflag & IO_UNIT0x01) { |
| 749 | detrunc(dep, osize, ioflag & IO_SYNC0x04, NOCRED((struct ucred *)-1), NULL((void *)0)); |
| 750 | uio->uio_offset -= resid - uio->uio_resid; |
| 751 | uio->uio_resid = resid; |
| 752 | } else { |
| 753 | detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC0x04, NOCRED((struct ucred *)-1), NULL((void *)0)); |
| 754 | if (uio->uio_resid != resid) |
| 755 | error = 0; |
| 756 | } |
| 757 | } else if (ioflag & IO_SYNC0x04) |
| 758 | error = deupdat(dep, 1); |
| 759 | |
| 760 | out: |
| 761 | /* correct the result for writes clamped by vn_fsizechk() */ |
| 762 | uio->uio_resid += overrun; |
| 763 | return (error); |
| 764 | } |
| 765 | |
| 766 | int |
| 767 | msdosfs_ioctl(void *v) |
| 768 | { |
| 769 | return (ENOTTY25); |
| 770 | } |
| 771 | |
| 772 | int |
| 773 | msdosfs_poll(void *v) |
| 774 | { |
| 775 | struct vop_poll_args *ap = v; |
| 776 | |
| 777 | return (ap->a_events & (POLLIN0x0001 | POLLOUT0x0004 | POLLRDNORM0x0040 | POLLWRNORM0x0004)); |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * Flush the blocks of a file to disk. |
| 782 | * |
| 783 | * This function is worthless for vnodes that represent directories. Maybe we |
| 784 | * could just do a sync if they try an fsync on a directory file. |
| 785 | */ |
| 786 | int |
| 787 | msdosfs_fsync(void *v) |
| 788 | { |
| 789 | struct vop_fsync_args *ap = v; |
| 790 | struct vnode *vp = ap->a_vp; |
| 791 | |
| 792 | vflushbuf(vp, ap->a_waitfor == MNT_WAIT1); |
| 793 | return (deupdat(VTODE(vp)((struct denode *)(vp)->v_data), ap->a_waitfor == MNT_WAIT1)); |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * Flush the blocks of a file to disk. |
| 798 | * |
| 799 | * This function is worthless for vnodes that represent directories. Maybe we |
| 800 | * could just do a sync if they try an fsync on a directory file. |
| 801 | */ |
| 802 | int |
| 803 | msdosfs_remove(void *v) |
| 804 | { |
| 805 | struct vop_remove_args *ap = v; |
| 806 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 807 | struct denode *ddep = VTODE(ap->a_dvp)((struct denode *)(ap->a_dvp)->v_data); |
| 808 | int error; |
| 809 | |
| 810 | if (ap->a_vp->v_type == VDIR) |
| 811 | error = EPERM1; |
| 812 | else |
| 813 | error = removede(ddep, dep); |
| 814 | |
| 815 | VN_KNOTE(ap->a_vp, NOTE_DELETE)do { struct klist *__list = (&ap->a_vp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0001)) ; } while (0); |
| 816 | VN_KNOTE(ap->a_dvp, NOTE_WRITE)do { struct klist *__list = (&ap->a_dvp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0002)) ; } while (0); |
| 817 | |
| 818 | #ifdef MSDOSFS_DEBUG |
| 819 | printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, |
| 820 | ap->a_vp->v_usecount); |
| 821 | #endif |
| 822 | if (ddep == dep) |
| 823 | vrele(ap->a_vp); |
| 824 | else |
| 825 | vput(ap->a_vp); /* causes msdosfs_inactive() to be called |
| 826 | * via vrele() */ |
| 827 | vput(ap->a_dvp); |
| 828 | return (error); |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * DOS filesystems don't know what links are. But since we already called |
| 833 | * msdosfs_lookup() with create and lockparent, the parent is locked so we |
| 834 | * have to free it before we return the error. |
| 835 | */ |
| 836 | int |
| 837 | msdosfs_link(void *v) |
| 838 | { |
| 839 | struct vop_link_args *ap = v; |
| 840 | |
| 841 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
| 842 | vput(ap->a_dvp); |
| 843 | return (EOPNOTSUPP45); |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Renames on files require moving the denode to a new hash queue since the |
| 848 | * denode's location is used to compute which hash queue to put the file |
| 849 | * in. Unless it is a rename in place. For example "mv a b". |
| 850 | * |
| 851 | * What follows is the basic algorithm: |
| 852 | * |
| 853 | * if (file move) { |
| 854 | * if (dest file exists) { |
| 855 | * remove dest file |
| 856 | * } |
| 857 | * if (dest and src in same directory) { |
| 858 | * rewrite name in existing directory slot |
| 859 | * } else { |
| 860 | * write new entry in dest directory |
| 861 | * update offset and dirclust in denode |
| 862 | * move denode to new hash chain |
| 863 | * clear old directory entry |
| 864 | * } |
| 865 | * } else { |
| 866 | * directory move |
| 867 | * if (dest directory exists) { |
| 868 | * if (dest is not empty) { |
| 869 | * return ENOTEMPTY |
| 870 | * } |
| 871 | * remove dest directory |
| 872 | * } |
| 873 | * if (dest and src in same directory) { |
| 874 | * rewrite name in existing entry |
| 875 | * } else { |
| 876 | * be sure dest is not a child of src directory |
| 877 | * write entry in dest directory |
| 878 | * update "." and ".." in moved directory |
| 879 | * update offset and dirclust in denode |
| 880 | * move denode to new hash chain |
| 881 | * clear old directory entry for moved directory |
| 882 | * } |
| 883 | * } |
| 884 | * |
| 885 | * On entry: |
| 886 | * source's parent directory is unlocked |
| 887 | * source file or directory is unlocked |
| 888 | * destination's parent directory is locked |
| 889 | * destination file or directory is locked if it exists |
| 890 | * |
| 891 | * On exit: |
| 892 | * all denodes should be released |
| 893 | * |
| 894 | * Notes: |
| 895 | * I'm not sure how the memory containing the pathnames pointed at by the |
| 896 | * componentname structures is freed, there may be some memory bleeding |
| 897 | * for each rename done. |
| 898 | */ |
| 899 | int |
| 900 | msdosfs_rename(void *v) |
| 901 | { |
| 902 | struct vop_rename_args *ap = v; |
| 903 | struct vnode *tvp = ap->a_tvp; |
| 904 | struct vnode *tdvp = ap->a_tdvp; |
| 905 | struct vnode *fvp = ap->a_fvp; |
| 906 | struct vnode *fdvp = ap->a_fdvp; |
| 907 | struct componentname *tcnp = ap->a_tcnp; |
| 908 | struct componentname *fcnp = ap->a_fcnp; |
| 909 | struct denode *ip, *xp, *dp, *zp; |
| 910 | u_char toname[11], oldname[11]; |
| 911 | uint32_t from_diroffset, to_diroffset; |
| 912 | u_char to_count; |
| 913 | int doingdirectory = 0, newparent = 0; |
| 914 | int error; |
| 915 | uint32_t cn, pcl; |
| 916 | daddr_t bn; |
| 917 | struct msdosfsmount *pmp; |
| 918 | struct direntry *dotdotp; |
| 919 | struct buf *bp; |
| 920 | |
| 921 | pmp = VFSTOMSDOSFS(fdvp->v_mount)((struct msdosfsmount *)fdvp->v_mount->mnt_data); |
| 922 | |
| 923 | #ifdef DIAGNOSTIC1 |
| 924 | if ((tcnp->cn_flags & HASBUF0x000400) == 0 || |
| 925 | (fcnp->cn_flags & HASBUF0x000400) == 0) |
| 926 | panic("msdosfs_rename: no name"); |
| 927 | #endif |
| 928 | /* |
| 929 | * Check for cross-device rename. |
| 930 | */ |
| 931 | if ((fvp->v_mount != tdvp->v_mount) || |
| 932 | (tvp && (fvp->v_mount != tvp->v_mount))) { |
| 933 | error = EXDEV18; |
| 934 | abortit: |
| 935 | VOP_ABORTOP(tdvp, tcnp); |
| 936 | if (tdvp == tvp) |
| 937 | vrele(tdvp); |
| 938 | else |
| 939 | vput(tdvp); |
| 940 | if (tvp) |
| 941 | vput(tvp); |
| 942 | VOP_ABORTOP(fdvp, fcnp); |
| 943 | vrele(fdvp); |
| 944 | vrele(fvp); |
| 945 | return (error); |
| 946 | } |
| 947 | |
| 948 | /* |
| 949 | * If source and dest are the same, do nothing. |
| 950 | */ |
| 951 | if (tvp == fvp) { |
| 952 | error = 0; |
| 953 | goto abortit; |
| 954 | } |
| 955 | |
| 956 | /* */ |
| 957 | if ((error = vn_lock(fvp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL)) != 0) |
| 958 | goto abortit; |
| 959 | dp = VTODE(fdvp)((struct denode *)(fdvp)->v_data); |
| 960 | ip = VTODE(fvp)((struct denode *)(fvp)->v_data); |
| 961 | |
| 962 | /* |
| 963 | * Be sure we are not renaming ".", "..", or an alias of ".". This |
| 964 | * leads to a crippled directory tree. It's pretty tough to do a |
| 965 | * "ls" or "pwd" with the "." directory entry missing, and "cd .." |
| 966 | * doesn't work if the ".." entry is missing. |
| 967 | */ |
| 968 | if (ip->de_Attributes & ATTR_DIRECTORY0x10) { |
| 969 | /* |
| 970 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
| 971 | */ |
| 972 | if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || |
| 973 | dp == ip || |
| 974 | (fcnp->cn_flags & ISDOTDOT0x002000) || |
| 975 | (tcnp->cn_flags & ISDOTDOT0x002000) || |
| 976 | (ip->de_flag & DE_RENAME0x0040)) { |
| 977 | VOP_UNLOCK(fvp); |
| 978 | error = EINVAL22; |
| 979 | goto abortit; |
| 980 | } |
| 981 | ip->de_flag |= DE_RENAME0x0040; |
| 982 | doingdirectory++; |
| 983 | } |
| 984 | VN_KNOTE(fdvp, NOTE_WRITE)do { struct klist *__list = (&fdvp->v_selectinfo.si_note ); if (__list != ((void *)0)) knote(__list, (0x0002)); } while (0); /* XXX right place? */ |
| 985 | |
| 986 | /* |
| 987 | * When the target exists, both the directory |
| 988 | * and target vnodes are returned locked. |
| 989 | */ |
| 990 | dp = VTODE(tdvp)((struct denode *)(tdvp)->v_data); |
| 991 | xp = tvp ? VTODE(tvp)((struct denode *)(tvp)->v_data) : NULL((void *)0); |
| 992 | /* |
| 993 | * Remember direntry place to use for destination |
| 994 | */ |
| 995 | to_diroffset = dp->de_fndoffset; |
| 996 | to_count = dp->de_fndcnt; |
| 997 | |
| 998 | /* |
| 999 | * If ".." must be changed (ie the directory gets a new |
| 1000 | * parent) then the source directory must not be in the |
| 1001 | * directory hierarchy above the target, as this would |
| 1002 | * orphan everything below the source directory. Also |
| 1003 | * the user must have write permission in the source so |
| 1004 | * as to be able to change "..". We must repeat the call |
| 1005 | * to namei, as the parent directory is unlocked by the |
| 1006 | * call to doscheckpath(). |
| 1007 | */ |
| 1008 | error = VOP_ACCESS(fvp, VWRITE00200, tcnp->cn_cred, tcnp->cn_proc); |
| 1009 | VOP_UNLOCK(fvp); |
| 1010 | if (VTODE(fdvp)((struct denode *)(fdvp)->v_data)->de_StartCluster != VTODE(tdvp)((struct denode *)(tdvp)->v_data)->de_StartCluster) |
| 1011 | newparent = 1; |
| 1012 | vrele(fdvp); |
| 1013 | if (doingdirectory && newparent) { |
| 1014 | if (error) /* write access check above */ |
| 1015 | goto bad1; |
| 1016 | if (xp != NULL((void *)0)) |
| 1017 | vput(tvp); |
| 1018 | /* |
| 1019 | * doscheckpath() vput()'s dp, |
| 1020 | * so we have to do a relookup afterwards |
| 1021 | */ |
| 1022 | if ((error = doscheckpath(ip, dp)) != 0) |
| 1023 | goto out; |
| 1024 | if ((tcnp->cn_flags & SAVESTART0x001000) == 0) |
| 1025 | panic("msdosfs_rename: lost to startdir"); |
| 1026 | if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0) |
| 1027 | goto out; |
| 1028 | dp = VTODE(tdvp)((struct denode *)(tdvp)->v_data); |
| 1029 | xp = tvp ? VTODE(tvp)((struct denode *)(tvp)->v_data) : NULL((void *)0); |
| 1030 | } |
| 1031 | |
| 1032 | VN_KNOTE(tdvp, NOTE_WRITE)do { struct klist *__list = (&tdvp->v_selectinfo.si_note ); if (__list != ((void *)0)) knote(__list, (0x0002)); } while (0); |
| 1033 | |
| 1034 | if (xp != NULL((void *)0)) { |
| 1035 | /* |
| 1036 | * Target must be empty if a directory and have no links |
| 1037 | * to it. Also, ensure source and target are compatible |
| 1038 | * (both directories, or both not directories). |
| 1039 | */ |
| 1040 | if (xp->de_Attributes & ATTR_DIRECTORY0x10) { |
| 1041 | if (!dosdirempty(xp)) { |
| 1042 | error = ENOTEMPTY66; |
| 1043 | goto bad1; |
| 1044 | } |
| 1045 | if (!doingdirectory) { |
| 1046 | error = ENOTDIR20; |
| 1047 | goto bad1; |
| 1048 | } |
| 1049 | cache_purge(tdvp); |
| 1050 | } else if (doingdirectory) { |
| 1051 | error = EISDIR21; |
| 1052 | goto bad1; |
| 1053 | } |
| 1054 | if ((error = removede(dp, xp)) != 0) |
| 1055 | goto bad1; |
| 1056 | VN_KNOTE(tvp, NOTE_DELETE)do { struct klist *__list = (&tvp->v_selectinfo.si_note ); if (__list != ((void *)0)) knote(__list, (0x0001)); } while (0); |
| 1057 | vput(tvp); |
| 1058 | xp = NULL((void *)0); |
| 1059 | } |
| 1060 | |
| 1061 | /* |
| 1062 | * Convert the filename in tcnp into a dos filename. We copy this |
| 1063 | * into the denode and directory entry for the destination |
| 1064 | * file/directory. |
| 1065 | */ |
| 1066 | if ((error = uniqdosname(VTODE(tdvp)((struct denode *)(tdvp)->v_data), tcnp, toname)) != 0) |
| 1067 | goto bad1; |
| 1068 | |
| 1069 | /* |
| 1070 | * Since from wasn't locked at various places above, |
| 1071 | * have to do a relookup here. |
| 1072 | */ |
| 1073 | fcnp->cn_flags &= ~MODMASK0x00fc; |
| 1074 | fcnp->cn_flags |= LOCKPARENT0x0008 | LOCKLEAF0x0004; |
| 1075 | if ((fcnp->cn_flags & SAVESTART0x001000) == 0) |
| 1076 | panic("msdosfs_rename: lost from startdir"); |
| 1077 | if (!newparent) |
| 1078 | VOP_UNLOCK(tdvp); |
| 1079 | (void) vfs_relookup(fdvp, &fvp, fcnp); |
| 1080 | if (fvp == NULL((void *)0)) { |
| 1081 | /* |
| 1082 | * From name has disappeared. |
| 1083 | */ |
| 1084 | if (doingdirectory) |
| 1085 | panic("rename: lost dir entry"); |
| 1086 | vrele(ap->a_fvp); |
| 1087 | if (newparent) |
| 1088 | VOP_UNLOCK(tdvp); |
| 1089 | vrele(tdvp); |
| 1090 | return 0; |
| 1091 | } |
| 1092 | xp = VTODE(fvp)((struct denode *)(fvp)->v_data); |
| 1093 | zp = VTODE(fdvp)((struct denode *)(fdvp)->v_data); |
| 1094 | from_diroffset = zp->de_fndoffset; |
| 1095 | |
| 1096 | /* |
| 1097 | * Ensure that the directory entry still exists and has not |
| 1098 | * changed till now. If the source is a file the entry may |
| 1099 | * have been unlinked or renamed. In either case there is |
| 1100 | * no further work to be done. If the source is a directory |
| 1101 | * then it cannot have been rmdir'ed or renamed; this is |
| 1102 | * prohibited by the DE_RENAME flag. |
| 1103 | */ |
| 1104 | if (xp != ip) { |
| 1105 | if (doingdirectory) |
| 1106 | panic("rename: lost dir entry"); |
| 1107 | vrele(ap->a_fvp); |
| 1108 | if (newparent) |
| 1109 | VOP_UNLOCK(fdvp); |
| 1110 | xp = NULL((void *)0); |
| 1111 | } else { |
| 1112 | vrele(fvp); |
| 1113 | xp = NULL((void *)0); |
| 1114 | |
| 1115 | /* |
| 1116 | * First write a new entry in the destination |
| 1117 | * directory and mark the entry in the source directory |
| 1118 | * as deleted. Then move the denode to the correct hash |
| 1119 | * chain for its new location in the filesystem. And, if |
| 1120 | * we moved a directory, then update its .. entry to point |
| 1121 | * to the new parent directory. |
| 1122 | */ |
| 1123 | bcopy(ip->de_Name, oldname, 11); |
| 1124 | bcopy(toname, ip->de_Name, 11); /* update denode */ |
| 1125 | dp->de_fndoffset = to_diroffset; |
| 1126 | dp->de_fndcnt = to_count; |
| 1127 | error = createde(ip, dp, NULL((void *)0), tcnp); |
| 1128 | if (error) { |
| 1129 | bcopy(oldname, ip->de_Name, 11); |
| 1130 | if (newparent) |
| 1131 | VOP_UNLOCK(fdvp); |
| 1132 | goto bad; |
| 1133 | } |
| 1134 | ip->de_refcnt++; |
| 1135 | zp->de_fndoffset = from_diroffset; |
| 1136 | if ((error = removede(zp, ip)) != 0) { |
| 1137 | /* XXX should really panic here, fs is corrupt */ |
| 1138 | if (newparent) |
| 1139 | VOP_UNLOCK(fdvp); |
| 1140 | goto bad; |
| 1141 | } |
| 1142 | |
| 1143 | cache_purge(fvp); |
| 1144 | |
| 1145 | if (!doingdirectory) { |
| 1146 | error = pcbmap(dp, de_cluster(pmp, to_diroffset)((to_diroffset) >> (pmp)->pm_cnshift), 0, |
| 1147 | &ip->de_dirclust, 0); |
| 1148 | if (error) { |
| 1149 | /* XXX should really panic here, fs is corrupt */ |
| 1150 | if (newparent) |
| 1151 | VOP_UNLOCK(fdvp); |
| 1152 | goto bad; |
| 1153 | } |
| 1154 | ip->de_diroffset = to_diroffset; |
| 1155 | if (ip->de_dirclust != MSDOSFSROOT0) |
| 1156 | ip->de_diroffset &= pmp->pm_crbomask; |
| 1157 | } |
| 1158 | reinsert(ip); |
| 1159 | if (newparent) |
| 1160 | VOP_UNLOCK(fdvp); |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * If we moved a directory to a new parent directory, then we must |
| 1165 | * fixup the ".." entry in the moved directory. |
| 1166 | */ |
| 1167 | if (doingdirectory && newparent) { |
| 1168 | cn = ip->de_StartCluster; |
| 1169 | if (cn == MSDOSFSROOT0) { |
| 1170 | /* this should never happen */ |
| 1171 | panic("msdosfs_rename: updating .. in root directory?"); |
| 1172 | } else |
| 1173 | bn = cntobn(pmp, cn)((((cn)-2) << (((pmp))->pm_cnshift - ((pmp))->pm_bnshift )) + (pmp)->pm_firstcluster); |
| 1174 | error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); |
| 1175 | if (error) { |
| 1176 | /* XXX should really panic here, fs is corrupt */ |
| 1177 | brelse(bp); |
| 1178 | goto bad; |
| 1179 | } |
| 1180 | dotdotp = (struct direntry *)bp->b_data; |
| 1181 | putushort(dotdotp[0].deStartCluster, cn)(*((u_int16_t *)(dotdotp[0].deStartCluster)) = (cn)); |
| 1182 | pcl = dp->de_StartCluster; |
| 1183 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && pcl == pmp->pm_rootdirblk) |
| 1184 | pcl = 0; |
| 1185 | putushort(dotdotp[1].deStartCluster, pcl)(*((u_int16_t *)(dotdotp[1].deStartCluster)) = (pcl)); |
| 1186 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) { |
| 1187 | putushort(dotdotp[0].deHighClust, cn >> 16)(*((u_int16_t *)(dotdotp[0].deHighClust)) = (cn >> 16)); |
| 1188 | putushort(dotdotp[1].deHighClust, pcl >> 16)(*((u_int16_t *)(dotdotp[1].deHighClust)) = (pcl >> 16) ); |
| 1189 | } |
| 1190 | if ((error = bwrite(bp)) != 0) { |
| 1191 | /* XXX should really panic here, fs is corrupt */ |
| 1192 | goto bad; |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | VN_KNOTE(fvp, NOTE_RENAME)do { struct klist *__list = (&fvp->v_selectinfo.si_note ); if (__list != ((void *)0)) knote(__list, (0x0020)); } while (0); |
| 1197 | |
| 1198 | bad: |
| 1199 | VOP_UNLOCK(fvp); |
| 1200 | vrele(fdvp); |
| 1201 | bad1: |
| 1202 | if (xp) |
| 1203 | vput(tvp); |
| 1204 | vput(tdvp); |
| 1205 | out: |
| 1206 | ip->de_flag &= ~DE_RENAME0x0040; |
| 1207 | vrele(fvp); |
| 1208 | return (error); |
| 1209 | |
| 1210 | } |
| 1211 | |
| 1212 | struct { |
| 1213 | struct direntry dot; |
| 1214 | struct direntry dotdot; |
| 1215 | } dosdirtemplate = { |
| 1216 | { ". ", " ", /* the . entry */ |
| 1217 | ATTR_DIRECTORY0x10, /* file attribute */ |
| 1218 | CASE_LOWER_BASE0x08 | CASE_LOWER_EXT0x10, /* lower case */ |
| 1219 | 0, /* create time 100ths */ |
| 1220 | { 0, 0 }, { 0, 0 }, /* create time & date */ |
| 1221 | { 0, 0 }, /* access date */ |
| 1222 | { 0, 0 }, /* high bits of start cluster */ |
| 1223 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
| 1224 | { 0, 0 }, /* startcluster */ |
| 1225 | { 0, 0, 0, 0 } /* filesize */ |
| 1226 | }, |
| 1227 | { ".. ", " ", /* the .. entry */ |
| 1228 | ATTR_DIRECTORY0x10, /* file attribute */ |
| 1229 | CASE_LOWER_BASE0x08 | CASE_LOWER_EXT0x10, /* lower case */ |
| 1230 | 0, /* create time 100ths */ |
| 1231 | { 0, 0 }, { 0, 0 }, /* create time & date */ |
| 1232 | { 0, 0 }, /* access date */ |
| 1233 | { 0, 0 }, /* high bits of start cluster */ |
| 1234 | { 210, 4 }, { 210, 4 }, /* modify time & date */ |
| 1235 | { 0, 0 }, /* startcluster */ |
| 1236 | { 0, 0, 0, 0 } /* filesize */ |
| 1237 | } |
| 1238 | }; |
| 1239 | |
| 1240 | int |
| 1241 | msdosfs_mkdir(void *v) |
| 1242 | { |
| 1243 | struct vop_mkdir_args *ap = v; |
| 1244 | struct componentname *cnp = ap->a_cnp; |
| 1245 | struct denode ndirent; |
| 1246 | struct denode *dep; |
| 1247 | struct denode *pdep = VTODE(ap->a_dvp)((struct denode *)(ap->a_dvp)->v_data); |
| 1248 | int error; |
| 1249 | daddr_t bn; |
| 1250 | uint32_t newcluster, pcl; |
| 1251 | struct direntry *denp; |
| 1252 | struct msdosfsmount *pmp = pdep->de_pmp; |
| 1253 | struct buf *bp; |
| 1254 | struct timespec ts; |
| 1255 | |
| 1256 | /* |
| 1257 | * If this is the root directory and there is no space left we |
| 1258 | * can't do anything. This is because the root directory can not |
| 1259 | * change size. |
| 1260 | */ |
| 1261 | if (pdep->de_StartCluster == MSDOSFSROOT0 |
| 1262 | && pdep->de_fndoffset >= pdep->de_FileSize) { |
| 1263 | error = ENOSPC28; |
| 1264 | goto bad2; |
| 1265 | } |
| 1266 | |
| 1267 | /* |
| 1268 | * Allocate a cluster to hold the about to be created directory. |
| 1269 | */ |
| 1270 | error = clusteralloc(pmp, 0, 1, &newcluster, NULL((void *)0)); |
| 1271 | if (error) |
| 1272 | goto bad2; |
| 1273 | |
| 1274 | bzero(&ndirent, sizeof(ndirent))__builtin_bzero((&ndirent), (sizeof(ndirent))); |
| 1275 | ndirent.de_pmp = pmp; |
| 1276 | ndirent.de_flag = DE_ACCESS0x0010 | DE_CREATE0x0008 | DE_UPDATE0x0004; |
| 1277 | getnanotime(&ts); |
| 1278 | DETIMES(&ndirent, &ts, &ts, &ts)if ((&ndirent)->de_flag & (0x0004 | 0x0008 | 0x0010 )) { (&ndirent)->de_flag |= 0x0020; if ((&ndirent) ->de_flag & 0x0004) { unix2dostime((&ts), &(& ndirent)->de_MDate, &(&ndirent)->de_MTime, ((void *)0)); (&ndirent)->de_Attributes |= 0x20; } if (!((& ndirent)->de_pmp->pm_flags & 0x04)) { if ((&ndirent )->de_flag & 0x0010) unix2dostime((&ts), &(& ndirent)->de_ADate, ((void *)0), ((void *)0)); if ((&ndirent )->de_flag & 0x0008) unix2dostime((&ts), &(& ndirent)->de_CDate, &(&ndirent)->de_CTime, & (&ndirent)->de_CTimeHundredth); } (&ndirent)->de_flag &= ~(0x0004 | 0x0008 | 0x0010); }; |
| 1279 | |
| 1280 | /* |
| 1281 | * Now fill the cluster with the "." and ".." entries. And write |
| 1282 | * the cluster to disk. This way it is there for the parent |
| 1283 | * directory to be pointing at if there were a crash. |
| 1284 | */ |
| 1285 | bn = cntobn(pmp, newcluster)((((newcluster)-2) << (((pmp))->pm_cnshift - ((pmp)) ->pm_bnshift)) + (pmp)->pm_firstcluster); |
| 1286 | /* always succeeds */ |
| 1287 | bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, INFSLP0xffffffffffffffffULL); |
| 1288 | bzero(bp->b_data, pmp->pm_bpcluster)__builtin_bzero((bp->b_data), (pmp->pm_bpcluster)); |
| 1289 | bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); |
| 1290 | denp = (struct direntry *)bp->b_data; |
| 1291 | putushort(denp[0].deStartCluster, newcluster)(*((u_int16_t *)(denp[0].deStartCluster)) = (newcluster)); |
| 1292 | putushort(denp[0].deCDate, ndirent.de_CDate)(*((u_int16_t *)(denp[0].deCDate)) = (ndirent.de_CDate)); |
| 1293 | putushort(denp[0].deCTime, ndirent.de_CTime)(*((u_int16_t *)(denp[0].deCTime)) = (ndirent.de_CTime)); |
| 1294 | denp[0].deCTimeHundredth = ndirent.de_CTimeHundredth; |
| 1295 | putushort(denp[0].deADate, ndirent.de_ADate)(*((u_int16_t *)(denp[0].deADate)) = (ndirent.de_ADate)); |
| 1296 | putushort(denp[0].deMDate, ndirent.de_MDate)(*((u_int16_t *)(denp[0].deMDate)) = (ndirent.de_MDate)); |
| 1297 | putushort(denp[0].deMTime, ndirent.de_MTime)(*((u_int16_t *)(denp[0].deMTime)) = (ndirent.de_MTime)); |
| 1298 | pcl = pdep->de_StartCluster; |
| 1299 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && pcl == pmp->pm_rootdirblk) |
| 1300 | pcl = 0; |
| 1301 | putushort(denp[1].deStartCluster, pcl)(*((u_int16_t *)(denp[1].deStartCluster)) = (pcl)); |
| 1302 | putushort(denp[1].deCDate, ndirent.de_CDate)(*((u_int16_t *)(denp[1].deCDate)) = (ndirent.de_CDate)); |
| 1303 | putushort(denp[1].deCTime, ndirent.de_CTime)(*((u_int16_t *)(denp[1].deCTime)) = (ndirent.de_CTime)); |
| 1304 | denp[1].deCTimeHundredth = ndirent.de_CTimeHundredth; |
| 1305 | putushort(denp[1].deADate, ndirent.de_ADate)(*((u_int16_t *)(denp[1].deADate)) = (ndirent.de_ADate)); |
| 1306 | putushort(denp[1].deMDate, ndirent.de_MDate)(*((u_int16_t *)(denp[1].deMDate)) = (ndirent.de_MDate)); |
| 1307 | putushort(denp[1].deMTime, ndirent.de_MTime)(*((u_int16_t *)(denp[1].deMTime)) = (ndirent.de_MTime)); |
| 1308 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) { |
| 1309 | putushort(denp[0].deHighClust, newcluster >> 16)(*((u_int16_t *)(denp[0].deHighClust)) = (newcluster >> 16)); |
| 1310 | putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16)(*((u_int16_t *)(denp[1].deHighClust)) = (pdep->de_StartCluster >> 16)); |
| 1311 | } |
| 1312 | |
| 1313 | if ((error = bwrite(bp)) != 0) |
| 1314 | goto bad; |
| 1315 | |
| 1316 | /* |
| 1317 | * Now build up a directory entry pointing to the newly allocated |
| 1318 | * cluster. This will be written to an empty slot in the parent |
| 1319 | * directory. |
| 1320 | */ |
| 1321 | #ifdef DIAGNOSTIC1 |
| 1322 | if ((cnp->cn_flags & HASBUF0x000400) == 0) |
| 1323 | panic("msdosfs_mkdir: no name"); |
| 1324 | #endif |
| 1325 | if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) |
| 1326 | goto bad; |
| 1327 | |
| 1328 | ndirent.de_Attributes = ATTR_DIRECTORY0x10; |
| 1329 | ndirent.de_StartCluster = newcluster; |
| 1330 | ndirent.de_FileSize = 0; |
| 1331 | ndirent.de_dev = pdep->de_dev; |
| 1332 | ndirent.de_devvp = pdep->de_devvp; |
| 1333 | if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) |
| 1334 | goto bad; |
| 1335 | if ((cnp->cn_flags & SAVESTART0x001000) == 0) |
| 1336 | pool_put(&namei_pool, cnp->cn_pnbuf); |
| 1337 | VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK)do { struct klist *__list = (&ap->a_dvp->v_selectinfo .si_note); if (__list != ((void *)0)) knote(__list, (0x0002 | 0x0010)); } while (0); |
| 1338 | vput(ap->a_dvp); |
| 1339 | *ap->a_vpp = DETOV(dep)((dep)->de_vnode); |
| 1340 | return (0); |
| 1341 | |
| 1342 | bad: |
| 1343 | clusterfree(pmp, newcluster, NULL((void *)0)); |
| 1344 | bad2: |
| 1345 | pool_put(&namei_pool, cnp->cn_pnbuf); |
| 1346 | vput(ap->a_dvp); |
| 1347 | return (error); |
| 1348 | } |
| 1349 | |
| 1350 | int |
| 1351 | msdosfs_rmdir(void *v) |
| 1352 | { |
| 1353 | struct vop_rmdir_args *ap = v; |
| 1354 | struct vnode *vp = ap->a_vp; |
| 1355 | struct vnode *dvp = ap->a_dvp; |
| 1356 | struct componentname *cnp = ap->a_cnp; |
| 1357 | struct denode *ip, *dp; |
| 1358 | int error; |
| 1359 | |
| 1360 | ip = VTODE(vp)((struct denode *)(vp)->v_data); |
| 1361 | dp = VTODE(dvp)((struct denode *)(dvp)->v_data); |
| 1362 | /* |
| 1363 | * Verify the directory is empty (and valid). |
| 1364 | * (Rmdir ".." won't be valid since |
| 1365 | * ".." will contain a reference to |
| 1366 | * the current directory and thus be |
| 1367 | * non-empty.) |
| 1368 | */ |
| 1369 | error = 0; |
Value stored to 'error' is never read | |
| 1370 | if (!dosdirempty(ip) || ip->de_flag & DE_RENAME0x0040) { |
| 1371 | error = ENOTEMPTY66; |
| 1372 | goto out; |
| 1373 | } |
| 1374 | |
| 1375 | VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK)do { struct klist *__list = (&dvp->v_selectinfo.si_note ); if (__list != ((void *)0)) knote(__list, (0x0002 | 0x0010) ); } while (0); |
| 1376 | |
| 1377 | /* |
| 1378 | * Delete the entry from the directory. For dos filesystems this |
| 1379 | * gets rid of the directory entry on disk, the in memory copy |
| 1380 | * still exists but the de_refcnt is <= 0. This prevents it from |
| 1381 | * being found by deget(). When the vput() on dep is done we give |
| 1382 | * up access and eventually msdosfs_reclaim() will be called which |
| 1383 | * will remove it from the denode cache. |
| 1384 | */ |
| 1385 | if ((error = removede(dp, ip)) != 0) |
| 1386 | goto out; |
| 1387 | /* |
| 1388 | * This is where we decrement the link count in the parent |
| 1389 | * directory. Since dos filesystems don't do this we just purge |
| 1390 | * the name cache and let go of the parent directory denode. |
| 1391 | */ |
| 1392 | cache_purge(dvp); |
| 1393 | vput(dvp); |
| 1394 | dvp = NULL((void *)0); |
| 1395 | /* |
| 1396 | * Truncate the directory that is being deleted. |
| 1397 | */ |
| 1398 | error = detrunc(ip, (uint32_t)0, IO_SYNC0x04, cnp->cn_cred, cnp->cn_proc); |
| 1399 | cache_purge(vp); |
| 1400 | out: |
| 1401 | if (dvp) |
| 1402 | vput(dvp); |
| 1403 | VN_KNOTE(vp, NOTE_DELETE)do { struct klist *__list = (&vp->v_selectinfo.si_note ); if (__list != ((void *)0)) knote(__list, (0x0001)); } while (0); |
| 1404 | vput(vp); |
| 1405 | return (error); |
| 1406 | } |
| 1407 | |
| 1408 | /* |
| 1409 | * DOS filesystems don't know what symlinks are. |
| 1410 | */ |
| 1411 | int |
| 1412 | msdosfs_symlink(void *v) |
| 1413 | { |
| 1414 | struct vop_symlink_args *ap = v; |
| 1415 | |
| 1416 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
| 1417 | vput(ap->a_dvp); |
| 1418 | return (EOPNOTSUPP45); |
| 1419 | } |
| 1420 | |
| 1421 | int |
| 1422 | msdosfs_readdir(void *v) |
| 1423 | { |
| 1424 | struct vop_readdir_args *ap = v; |
| 1425 | int error = 0; |
| 1426 | int diff; |
| 1427 | long n; |
| 1428 | int blsize; |
| 1429 | long on; |
| 1430 | long lost; |
| 1431 | long count; |
| 1432 | uint32_t dirsperblk; |
| 1433 | uint32_t cn, lbn; |
| 1434 | uint32_t fileno; |
| 1435 | long bias = 0; |
| 1436 | daddr_t bn; |
| 1437 | struct buf *bp; |
| 1438 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 1439 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1440 | struct direntry *dentp; |
| 1441 | struct dirent dirbuf; |
| 1442 | struct uio *uio = ap->a_uio; |
| 1443 | off_t offset, wlast = -1; |
| 1444 | int chksum = -1; |
| 1445 | |
| 1446 | #ifdef MSDOSFS_DEBUG |
| 1447 | printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", |
| 1448 | ap->a_vp, uio, ap->a_cred, ap->a_eofflag); |
| 1449 | #endif |
| 1450 | |
| 1451 | /* |
| 1452 | * msdosfs_readdir() won't operate properly on regular files since |
| 1453 | * it does i/o only with the filesystem vnode, and hence can |
| 1454 | * retrieve the wrong block from the buffer cache for a plain file. |
| 1455 | * So, fail attempts to readdir() on a plain file. |
| 1456 | */ |
| 1457 | if ((dep->de_Attributes & ATTR_DIRECTORY0x10) == 0) |
| 1458 | return (ENOTDIR20); |
| 1459 | |
| 1460 | /* |
| 1461 | * To be safe, initialize dirbuf |
| 1462 | */ |
| 1463 | bzero(&dirbuf, sizeof(dirbuf))__builtin_bzero((&dirbuf), (sizeof(dirbuf))); |
| 1464 | |
| 1465 | /* |
| 1466 | * If the user buffer is smaller than the size of one dos directory |
| 1467 | * entry or the file offset is not a multiple of the size of a |
| 1468 | * directory entry, then we fail the read. |
| 1469 | */ |
| 1470 | count = uio->uio_resid & ~(sizeof(struct direntry) - 1); |
| 1471 | offset = uio->uio_offset; |
| 1472 | if (count < sizeof(struct direntry) || |
| 1473 | (offset & (sizeof(struct direntry) - 1))) |
| 1474 | return (EINVAL22); |
| 1475 | lost = uio->uio_resid - count; |
| 1476 | uio->uio_resid = count; |
| 1477 | |
| 1478 | dirsperblk = pmp->pm_BytesPerSecpm_bpb.bpbBytesPerSec / sizeof(struct direntry); |
| 1479 | |
| 1480 | /* |
| 1481 | * If they are reading from the root directory then, we simulate |
| 1482 | * the . and .. entries since these don't exist in the root |
| 1483 | * directory. We also set the offset bias to make up for having to |
| 1484 | * simulate these entries. By this I mean that at file offset 64 we |
| 1485 | * read the first entry in the root directory that lives on disk. |
| 1486 | */ |
| 1487 | if (dep->de_StartCluster == MSDOSFSROOT0 |
| 1488 | || (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) && dep->de_StartCluster == pmp->pm_rootdirblk)) { |
| 1489 | #if 0 |
| 1490 | printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", |
| 1491 | offset); |
| 1492 | #endif |
| 1493 | bias = 2 * sizeof(struct direntry); |
| 1494 | if (offset < bias) { |
| 1495 | for (n = (int)offset / sizeof(struct direntry); |
| 1496 | n < 2; n++) { |
| 1497 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
| 1498 | dirbuf.d_fileno = pmp->pm_rootdirblk; |
| 1499 | else |
| 1500 | dirbuf.d_fileno = 1; |
| 1501 | dirbuf.d_type = DT_DIR4; |
| 1502 | switch (n) { |
| 1503 | case 0: |
| 1504 | dirbuf.d_namlen = 1; |
| 1505 | strlcpy(dirbuf.d_name, ".", |
| 1506 | sizeof dirbuf.d_name); |
| 1507 | break; |
| 1508 | case 1: |
| 1509 | dirbuf.d_namlen = 2; |
| 1510 | strlcpy(dirbuf.d_name, "..", |
| 1511 | sizeof dirbuf.d_name); |
| 1512 | break; |
| 1513 | } |
| 1514 | dirbuf.d_reclen = DIRENT_SIZE(&dirbuf)((__builtin_offsetof(struct dirent, d_name) + ((&dirbuf)-> d_namlen) + 1 + 7) &~ 7); |
| 1515 | dirbuf.d_off = offset + |
| 1516 | sizeof(struct direntry); |
| 1517 | if (uio->uio_resid < dirbuf.d_reclen) |
| 1518 | goto out; |
| 1519 | error = uiomove(&dirbuf, dirbuf.d_reclen, uio); |
| 1520 | if (error) |
| 1521 | goto out; |
| 1522 | offset = dirbuf.d_off; |
| 1523 | } |
| 1524 | } |
| 1525 | } |
| 1526 | |
| 1527 | while (uio->uio_resid > 0) { |
| 1528 | lbn = de_cluster(pmp, offset - bias)((offset - bias) >> (pmp)->pm_cnshift); |
| 1529 | on = (offset - bias) & pmp->pm_crbomask; |
| 1530 | n = min(pmp->pm_bpcluster - on, uio->uio_resid); |
| 1531 | diff = dep->de_FileSize - (offset - bias); |
| 1532 | if (diff <= 0) |
| 1533 | break; |
| 1534 | n = min(n, diff); |
| 1535 | if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) |
| 1536 | break; |
| 1537 | error = bread(pmp->pm_devvp, bn, blsize, &bp); |
| 1538 | if (error) { |
| 1539 | brelse(bp); |
| 1540 | return (error); |
| 1541 | } |
| 1542 | n = min(n, blsize - bp->b_resid); |
| 1543 | |
| 1544 | /* |
| 1545 | * Convert from dos directory entries to fs-independent |
| 1546 | * directory entries. |
| 1547 | */ |
| 1548 | for (dentp = (struct direntry *)(bp->b_data + on); |
| 1549 | (char *)dentp < bp->b_data + on + n; |
| 1550 | dentp++, offset += sizeof(struct direntry)) { |
| 1551 | #if 0 |
| 1552 | printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", |
| 1553 | dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); |
| 1554 | #endif |
| 1555 | /* |
| 1556 | * If this is an unused entry, we can stop. |
| 1557 | */ |
| 1558 | if (dentp->deName[0] == SLOT_EMPTY0x00) { |
| 1559 | brelse(bp); |
| 1560 | goto out; |
| 1561 | } |
| 1562 | /* |
| 1563 | * Skip deleted entries. |
| 1564 | */ |
| 1565 | if (dentp->deName[0] == SLOT_DELETED0xe5) { |
| 1566 | chksum = -1; |
| 1567 | wlast = -1; |
| 1568 | continue; |
| 1569 | } |
| 1570 | |
| 1571 | /* |
| 1572 | * Handle Win95 long directory entries |
| 1573 | */ |
| 1574 | if (dentp->deAttributes == ATTR_WIN950x0f) { |
| 1575 | struct winentry *wep; |
| 1576 | if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME0x01) |
| 1577 | continue; |
| 1578 | wep = (struct winentry *)dentp; |
| 1579 | chksum = win2unixfn(wep, &dirbuf, chksum); |
| 1580 | if (wep->weCnt & WIN_LAST0x40) |
| 1581 | wlast = offset; |
| 1582 | continue; |
| 1583 | } |
| 1584 | |
| 1585 | /* |
| 1586 | * Skip volume labels |
| 1587 | */ |
| 1588 | if (dentp->deAttributes & ATTR_VOLUME0x08) { |
| 1589 | chksum = -1; |
| 1590 | wlast = -1; |
| 1591 | continue; |
| 1592 | } |
| 1593 | |
| 1594 | /* |
| 1595 | * This computation of d_fileno must match |
| 1596 | * the computation of va_fileid in |
| 1597 | * msdosfs_getattr. |
| 1598 | */ |
| 1599 | fileno = getushort(dentp->deStartCluster)*((u_int16_t *)(dentp->deStartCluster)); |
| 1600 | if (FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff)) |
| 1601 | fileno |= getushort(dentp->deHighClust)*((u_int16_t *)(dentp->deHighClust)) << 16; |
| 1602 | |
| 1603 | if (dentp->deAttributes & ATTR_DIRECTORY0x10) { |
| 1604 | /* Special-case root */ |
| 1605 | if (fileno == MSDOSFSROOT0) { |
| 1606 | fileno = FAT32(pmp)(pmp->pm_fatmask == 0x0fffffff) ? |
| 1607 | pmp->pm_rootdirblk : 1; |
| 1608 | } |
| 1609 | |
| 1610 | dirbuf.d_fileno = fileno; |
| 1611 | dirbuf.d_type = DT_DIR4; |
| 1612 | } else { |
| 1613 | if (getulong(dentp->deFileSize)*((u_int32_t *)(dentp->deFileSize)) == 0) { |
| 1614 | uint64_t fileno64; |
| 1615 | |
| 1616 | fileno64 = (cn == MSDOSFSROOT0) ? |
| 1617 | roottobn(pmp, 0)((((((((0))) >> (((pmp)))->pm_cnshift)) << ((( pmp))->pm_cnshift - ((pmp))->pm_bnshift))) + (pmp)-> pm_rootdirblk) : cntobn(pmp, cn)((((cn)-2) << (((pmp))->pm_cnshift - ((pmp))->pm_bnshift )) + (pmp)->pm_firstcluster); |
| 1618 | |
| 1619 | fileno64 *= dirsperblk; |
| 1620 | fileno64 += dentp - |
| 1621 | (struct direntry *)bp->b_data; |
| 1622 | |
| 1623 | fileno = fileidhash(fileno64); |
| 1624 | } |
| 1625 | |
| 1626 | dirbuf.d_fileno = fileno; |
| 1627 | dirbuf.d_type = DT_REG8; |
| 1628 | } |
| 1629 | |
| 1630 | if (chksum != winChksum(dentp->deName)) |
| 1631 | dirbuf.d_namlen = dos2unixfn(dentp->deName, |
| 1632 | (u_char *)dirbuf.d_name, |
| 1633 | pmp->pm_flags & MSDOSFSMNT_SHORTNAME0x01); |
| 1634 | else |
| 1635 | dirbuf.d_name[dirbuf.d_namlen] = 0; |
| 1636 | chksum = -1; |
| 1637 | dirbuf.d_reclen = DIRENT_SIZE(&dirbuf)((__builtin_offsetof(struct dirent, d_name) + ((&dirbuf)-> d_namlen) + 1 + 7) &~ 7); |
| 1638 | dirbuf.d_off = offset + sizeof(struct direntry); |
| 1639 | if (uio->uio_resid < dirbuf.d_reclen) { |
| 1640 | brelse(bp); |
| 1641 | /* Remember long-name offset. */ |
| 1642 | if (wlast != -1) |
| 1643 | offset = wlast; |
| 1644 | goto out; |
| 1645 | } |
| 1646 | wlast = -1; |
| 1647 | error = uiomove(&dirbuf, dirbuf.d_reclen, uio); |
| 1648 | if (error) { |
| 1649 | brelse(bp); |
| 1650 | goto out; |
| 1651 | } |
| 1652 | } |
| 1653 | brelse(bp); |
| 1654 | } |
| 1655 | |
| 1656 | out: |
| 1657 | uio->uio_offset = offset; |
| 1658 | uio->uio_resid += lost; |
| 1659 | if (dep->de_FileSize - (offset - bias) <= 0) |
| 1660 | *ap->a_eofflag = 1; |
| 1661 | else |
| 1662 | *ap->a_eofflag = 0; |
| 1663 | return (error); |
| 1664 | } |
| 1665 | |
| 1666 | /* |
| 1667 | * DOS filesystems don't know what symlinks are. |
| 1668 | */ |
| 1669 | int |
| 1670 | msdosfs_readlink(void *v) |
| 1671 | { |
| 1672 | #if 0 |
| 1673 | struct vop_readlink_args /* { |
| 1674 | struct vnode *a_vp; |
| 1675 | struct uio *a_uio; |
| 1676 | struct ucred *a_cred; |
| 1677 | } */ *ap; |
| 1678 | #endif |
| 1679 | |
| 1680 | return (EINVAL22); |
| 1681 | } |
| 1682 | |
| 1683 | int |
| 1684 | msdosfs_lock(void *v) |
| 1685 | { |
| 1686 | struct vop_lock_args *ap = v; |
| 1687 | struct vnode *vp = ap->a_vp; |
| 1688 | |
| 1689 | return rrw_enter(&VTODE(vp)((struct denode *)(vp)->v_data)->de_lock, ap->a_flags & LK_RWFLAGS(0x0001UL|0x0002UL|0x0040UL|0x0080UL|0x0100UL)); |
| 1690 | } |
| 1691 | |
| 1692 | int |
| 1693 | msdosfs_unlock(void *v) |
| 1694 | { |
| 1695 | struct vop_unlock_args *ap = v; |
| 1696 | struct vnode *vp = ap->a_vp; |
| 1697 | |
| 1698 | rrw_exit(&VTODE(vp)((struct denode *)(vp)->v_data)->de_lock); |
| 1699 | return 0; |
| 1700 | } |
| 1701 | |
| 1702 | int |
| 1703 | msdosfs_islocked(void *v) |
| 1704 | { |
| 1705 | struct vop_islocked_args *ap = v; |
| 1706 | |
| 1707 | return rrw_status(&VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data)->de_lock); |
| 1708 | } |
| 1709 | |
| 1710 | /* |
| 1711 | * vp - address of vnode file the file |
| 1712 | * bn - which cluster we are interested in mapping to a filesystem block number |
| 1713 | * vpp - returns the vnode for the block special file holding the filesystem |
| 1714 | * containing the file of interest |
| 1715 | * bnp - address of where to return the filesystem relative block number |
| 1716 | */ |
| 1717 | int |
| 1718 | msdosfs_bmap(void *v) |
| 1719 | { |
| 1720 | struct vop_bmap_args *ap = v; |
| 1721 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 1722 | uint32_t cn; |
| 1723 | |
| 1724 | if (ap->a_vpp != NULL((void *)0)) |
| 1725 | *ap->a_vpp = dep->de_devvp; |
| 1726 | if (ap->a_bnp == NULL((void *)0)) |
| 1727 | return (0); |
| 1728 | |
| 1729 | cn = ap->a_bn; |
| 1730 | if (cn != ap->a_bn) |
| 1731 | return (EFBIG27); |
| 1732 | |
| 1733 | return (msdosfs_bmaparray(ap->a_vp, cn, ap->a_bnp, ap->a_runp)); |
| 1734 | } |
| 1735 | |
| 1736 | int |
| 1737 | msdosfs_bmaparray(struct vnode *vp, uint32_t cn, daddr_t *bnp, int *runp) |
| 1738 | { |
| 1739 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 1740 | struct msdosfsmount *pmp = dep->de_pmp; |
| 1741 | struct mount *mp; |
| 1742 | int error, maxrun = 0, run; |
| 1743 | daddr_t runbn; |
| 1744 | |
| 1745 | mp = vp->v_mount; |
| 1746 | |
| 1747 | if (runp) { |
| 1748 | /* |
| 1749 | * XXX |
| 1750 | * If MAXBSIZE is the largest transfer the disks can handle, |
| 1751 | * we probably want maxrun to be 1 block less so that we |
| 1752 | * don't create a block larger than the device can handle. |
| 1753 | */ |
| 1754 | *runp = 0; |
| 1755 | maxrun = min(MAXBSIZE(64 * 1024) / mp->mnt_stat.f_iosize - 1, |
| 1756 | pmp->pm_maxcluster - cn); |
| 1757 | } |
| 1758 | |
| 1759 | if ((error = pcbmap(dep, cn, bnp, 0, 0)) != 0) |
| 1760 | return (error); |
| 1761 | |
| 1762 | for (run = 1; run <= maxrun; run++) { |
| 1763 | error = pcbmap(dep, cn + run, &runbn, 0, 0); |
| 1764 | if (error != 0 || (runbn != *bnp + de_cn2bn(pmp, run)((run) << ((pmp)->pm_cnshift - (pmp)->pm_bnshift) ))) |
| 1765 | break; |
| 1766 | } |
| 1767 | |
| 1768 | if (runp) |
| 1769 | *runp = run - 1; |
| 1770 | |
| 1771 | return (0); |
| 1772 | } |
| 1773 | |
| 1774 | int |
| 1775 | msdosfs_strategy(void *v) |
| 1776 | { |
| 1777 | struct vop_strategy_args *ap = v; |
| 1778 | struct buf *bp = ap->a_bp; |
| 1779 | struct denode *dep = VTODE(bp->b_vp)((struct denode *)(bp->b_vp)->v_data); |
| 1780 | struct vnode *vp; |
| 1781 | int error = 0; |
| 1782 | int s; |
| 1783 | |
| 1784 | if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) |
| 1785 | panic("msdosfs_strategy: spec"); |
| 1786 | /* |
| 1787 | * If we don't already know the filesystem relative block number |
| 1788 | * then get it using pcbmap(). If pcbmap() returns the block |
| 1789 | * number as -1 then we've got a hole in the file. DOS filesystems |
| 1790 | * don't allow files with holes, so we shouldn't ever see this. |
| 1791 | */ |
| 1792 | if (bp->b_blkno == bp->b_lblkno) { |
| 1793 | error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); |
| 1794 | if (error) |
| 1795 | bp->b_blkno = -1; |
| 1796 | if (bp->b_blkno == -1) |
| 1797 | clrbuf(bp){ __builtin_bzero(((bp)->b_data), ((bp)->b_bcount)); (bp )->b_resid = 0; }; |
| 1798 | } |
| 1799 | if (bp->b_blkno == -1) { |
| 1800 | s = splbio()splraise(0x6); |
| 1801 | biodone(bp); |
| 1802 | splx(s)spllower(s); |
| 1803 | return (error); |
| 1804 | } |
| 1805 | |
| 1806 | /* |
| 1807 | * Read/write the block from/to the disk that contains the desired |
| 1808 | * file block. |
| 1809 | */ |
| 1810 | |
| 1811 | vp = dep->de_devvp; |
| 1812 | bp->b_dev = vp->v_rdevv_un.vu_specinfo->si_rdev; |
| 1813 | VOP_STRATEGY(vp, bp); |
| 1814 | return (0); |
| 1815 | } |
| 1816 | |
| 1817 | int |
| 1818 | msdosfs_print(void *v) |
| 1819 | { |
| 1820 | struct vop_print_args *ap = v; |
| 1821 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 1822 | |
| 1823 | printf( |
| 1824 | "tag VT_MSDOSFS, startcluster %u, dircluster %u, diroffset %u ", |
| 1825 | dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); |
| 1826 | printf(" dev %d, %d, %s\n", |
| 1827 | major(dep->de_dev)(((unsigned)(dep->de_dev) >> 8) & 0xff), minor(dep->de_dev)((unsigned)((dep->de_dev) & 0xff) | (((dep->de_dev) & 0xffff0000) >> 8)), |
| 1828 | VOP_ISLOCKED(ap->a_vp) ? "(LOCKED)" : ""); |
| 1829 | #ifdef DIAGNOSTIC1 |
| 1830 | printf("\n"); |
| 1831 | #endif |
| 1832 | |
| 1833 | return (0); |
| 1834 | } |
| 1835 | |
| 1836 | int |
| 1837 | msdosfs_advlock(void *v) |
| 1838 | { |
| 1839 | struct vop_advlock_args *ap = v; |
| 1840 | struct denode *dep = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data); |
| 1841 | |
| 1842 | return (lf_advlock(&dep->de_lockf, dep->de_FileSize, ap->a_id, ap->a_op, |
| 1843 | ap->a_fl, ap->a_flags)); |
| 1844 | } |
| 1845 | |
| 1846 | int |
| 1847 | msdosfs_pathconf(void *v) |
| 1848 | { |
| 1849 | struct vop_pathconf_args *ap = v; |
| 1850 | struct msdosfsmount *pmp = VTODE(ap->a_vp)((struct denode *)(ap->a_vp)->v_data)->de_pmp; |
| 1851 | int error = 0; |
| 1852 | |
| 1853 | switch (ap->a_name) { |
| 1854 | case _PC_LINK_MAX1: |
| 1855 | *ap->a_retval = 1; |
| 1856 | break; |
| 1857 | case _PC_NAME_MAX4: |
| 1858 | *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME0x02 ? WIN_MAXLEN255 : 12; |
| 1859 | break; |
| 1860 | case _PC_CHOWN_RESTRICTED7: |
| 1861 | *ap->a_retval = 1; |
| 1862 | break; |
| 1863 | case _PC_NO_TRUNC8: |
| 1864 | *ap->a_retval = 0; |
| 1865 | break; |
| 1866 | case _PC_TIMESTAMP_RESOLUTION21: |
| 1867 | *ap->a_retval = 2000000000; /* 2 billion nanoseconds */ |
| 1868 | break; |
| 1869 | default: |
| 1870 | error = EINVAL22; |
| 1871 | break; |
| 1872 | } |
| 1873 | |
| 1874 | return (error); |
| 1875 | } |
| 1876 | |
| 1877 | /* |
| 1878 | * Thomas Wang's hash function, severely hacked to always set the high |
| 1879 | * bit on the number it returns (so no longer a proper hash function). |
| 1880 | */ |
| 1881 | static uint32_t |
| 1882 | fileidhash(uint64_t fileid) |
| 1883 | { |
| 1884 | uint64_t c1 = 0x6e5ea73858134343LL; |
| 1885 | uint64_t c2 = 0xb34e8f99a2ec9ef5LL; |
| 1886 | |
| 1887 | /* |
| 1888 | * We now have the original fileid value, as 64-bit value. |
| 1889 | * We need to reduce it to 32-bits, with the top bit set. |
| 1890 | */ |
| 1891 | fileid ^= ((c1 ^ fileid) >> 32); |
| 1892 | fileid *= c1; |
| 1893 | fileid ^= ((c2 ^ fileid) >> 31); |
| 1894 | fileid *= c2; |
| 1895 | fileid ^= ((c1 ^ fileid) >> 32); |
| 1896 | |
| 1897 | return (uint32_t)(fileid | 0x80000000); |
| 1898 | } |
| 1899 | |
| 1900 | /* Global vfs data structures for msdosfs */ |
| 1901 | const struct vops msdosfs_vops = { |
| 1902 | .vop_lookup = msdosfs_lookup, |
| 1903 | .vop_create = msdosfs_create, |
| 1904 | .vop_mknod = msdosfs_mknod, |
| 1905 | .vop_open = msdosfs_open, |
| 1906 | .vop_close = msdosfs_close, |
| 1907 | .vop_access = msdosfs_access, |
| 1908 | .vop_getattr = msdosfs_getattr, |
| 1909 | .vop_setattr = msdosfs_setattr, |
| 1910 | .vop_read = msdosfs_read, |
| 1911 | .vop_write = msdosfs_write, |
| 1912 | .vop_ioctl = msdosfs_ioctl, |
| 1913 | .vop_poll = msdosfs_poll, |
| 1914 | .vop_kqfilter = msdosfs_kqfilter, |
| 1915 | .vop_fsync = msdosfs_fsync, |
| 1916 | .vop_remove = msdosfs_remove, |
| 1917 | .vop_link = msdosfs_link, |
| 1918 | .vop_rename = msdosfs_rename, |
| 1919 | .vop_mkdir = msdosfs_mkdir, |
| 1920 | .vop_rmdir = msdosfs_rmdir, |
| 1921 | .vop_symlink = msdosfs_symlink, |
| 1922 | .vop_readdir = msdosfs_readdir, |
| 1923 | .vop_readlink = msdosfs_readlink, |
| 1924 | .vop_abortop = vop_generic_abortop, |
| 1925 | .vop_inactive = msdosfs_inactive, |
| 1926 | .vop_reclaim = msdosfs_reclaim, |
| 1927 | .vop_lock = msdosfs_lock, |
| 1928 | .vop_unlock = msdosfs_unlock, |
| 1929 | .vop_bmap = msdosfs_bmap, |
| 1930 | .vop_strategy = msdosfs_strategy, |
| 1931 | .vop_print = msdosfs_print, |
| 1932 | .vop_islocked = msdosfs_islocked, |
| 1933 | .vop_pathconf = msdosfs_pathconf, |
| 1934 | .vop_advlock = msdosfs_advlock, |
| 1935 | .vop_bwrite = vop_generic_bwrite, |
| 1936 | .vop_revoke = vop_generic_revoke, |
| 1937 | }; |
| 1938 | |
| 1939 | const struct filterops msdosfsread_filtops = { |
| 1940 | .f_flags = FILTEROP_ISFD0x00000001, |
| 1941 | .f_attach = NULL((void *)0), |
| 1942 | .f_detach = filt_msdosfsdetach, |
| 1943 | .f_event = filt_msdosfsread, |
| 1944 | }; |
| 1945 | |
| 1946 | const struct filterops msdosfswrite_filtops = { |
| 1947 | .f_flags = FILTEROP_ISFD0x00000001, |
| 1948 | .f_attach = NULL((void *)0), |
| 1949 | .f_detach = filt_msdosfsdetach, |
| 1950 | .f_event = filt_msdosfswrite, |
| 1951 | }; |
| 1952 | |
| 1953 | const struct filterops msdosfsvnode_filtops = { |
| 1954 | .f_flags = FILTEROP_ISFD0x00000001, |
| 1955 | .f_attach = NULL((void *)0), |
| 1956 | .f_detach = filt_msdosfsdetach, |
| 1957 | .f_event = filt_msdosfsvnode, |
| 1958 | }; |
| 1959 | |
| 1960 | int |
| 1961 | msdosfs_kqfilter(void *v) |
| 1962 | { |
| 1963 | struct vop_kqfilter_args *ap = v; |
| 1964 | struct vnode *vp = ap->a_vp; |
| 1965 | struct knote *kn = ap->a_kn; |
| 1966 | |
| 1967 | switch (kn->kn_filterkn_kevent.filter) { |
| 1968 | case EVFILT_READ(-1): |
| 1969 | kn->kn_fop = &msdosfsread_filtops; |
| 1970 | break; |
| 1971 | case EVFILT_WRITE(-2): |
| 1972 | kn->kn_fop = &msdosfswrite_filtops; |
| 1973 | break; |
| 1974 | case EVFILT_VNODE(-4): |
| 1975 | kn->kn_fop = &msdosfsvnode_filtops; |
| 1976 | break; |
| 1977 | default: |
| 1978 | return (EINVAL22); |
| 1979 | } |
| 1980 | |
| 1981 | kn->kn_hook = (caddr_t)vp; |
| 1982 | |
| 1983 | klist_insert_locked(&vp->v_selectinfo.si_note, kn); |
| 1984 | |
| 1985 | return (0); |
| 1986 | } |
| 1987 | |
| 1988 | void |
| 1989 | filt_msdosfsdetach(struct knote *kn) |
| 1990 | { |
| 1991 | struct vnode *vp = (struct vnode *)kn->kn_hook; |
| 1992 | |
| 1993 | klist_remove_locked(&vp->v_selectinfo.si_note, kn); |
| 1994 | } |
| 1995 | |
| 1996 | int |
| 1997 | filt_msdosfsread(struct knote *kn, long hint) |
| 1998 | { |
| 1999 | struct vnode *vp = (struct vnode *)kn->kn_hook; |
| 2000 | struct denode *dep = VTODE(vp)((struct denode *)(vp)->v_data); |
| 2001 | |
| 2002 | /* |
| 2003 | * filesystem is gone, so set the EOF flag and schedule |
| 2004 | * the knote for deletion. |
| 2005 | */ |
| 2006 | if (hint == NOTE_REVOKE0x0040) { |
| 2007 | kn->kn_flagskn_kevent.flags |= (EV_EOF0x8000 | EV_ONESHOT0x0010); |
| 2008 | return (1); |
| 2009 | } |
| 2010 | |
| 2011 | kn->kn_datakn_kevent.data = dep->de_FileSize - foffset(kn->kn_fpkn_ptr.p_fp); |
| 2012 | if (kn->kn_datakn_kevent.data == 0 && kn->kn_sfflags & NOTE_EOF0x0002) { |
| 2013 | kn->kn_fflagskn_kevent.fflags |= NOTE_EOF0x0002; |
| 2014 | return (1); |
| 2015 | } |
| 2016 | |
| 2017 | if (kn->kn_flagskn_kevent.flags & (__EV_POLL0x1000 | __EV_SELECT0x0800)) |
| 2018 | return (1); |
| 2019 | |
| 2020 | return (kn->kn_datakn_kevent.data != 0); |
| 2021 | } |
| 2022 | |
| 2023 | int |
| 2024 | filt_msdosfswrite(struct knote *kn, long hint) |
| 2025 | { |
| 2026 | /* |
| 2027 | * filesystem is gone, so set the EOF flag and schedule |
| 2028 | * the knote for deletion. |
| 2029 | */ |
| 2030 | if (hint == NOTE_REVOKE0x0040) { |
| 2031 | kn->kn_flagskn_kevent.flags |= (EV_EOF0x8000 | EV_ONESHOT0x0010); |
| 2032 | return (1); |
| 2033 | } |
| 2034 | |
| 2035 | kn->kn_datakn_kevent.data = 0; |
| 2036 | return (1); |
| 2037 | } |
| 2038 | |
| 2039 | int |
| 2040 | filt_msdosfsvnode(struct knote *kn, long hint) |
| 2041 | { |
| 2042 | if (kn->kn_sfflags & hint) |
| 2043 | kn->kn_fflagskn_kevent.fflags |= hint; |
| 2044 | if (hint == NOTE_REVOKE0x0040) { |
| 2045 | kn->kn_flagskn_kevent.flags |= EV_EOF0x8000; |
| 2046 | return (1); |
| 2047 | } |
| 2048 | return (kn->kn_fflagskn_kevent.fflags != 0); |
| 2049 | } |