Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/ufs/ext2fs/ext2fs_readwrite.c
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1 /* $NetBSD: ext2fs_readwrite.c,v 1.32 2004/03/22 19:23:08 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ufs_readwrite.c 8.8 (Berkeley) 8/4/94 32 * Modified for ext2fs by Manuel Bouyer. 33 */ 34 35 /*- 36 * Copyright (c) 1997 Manuel Bouyer. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by Manuel Bouyer. 49 * 4. The name of the author may not be used to endorse or promote products 50 * derived from this software without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 * 63 * @(#)ufs_readwrite.c 8.8 (Berkeley) 8/4/94 64 * Modified for ext2fs by Manuel Bouyer. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: ext2fs_readwrite.c,v 1.32 2004/03/22 19:23:08 bouyer Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/resourcevar.h> 73 #include <sys/kernel.h> 74 #include <sys/file.h> 75 #include <sys/stat.h> 76 #include <sys/buf.h> 77 #include <sys/proc.h> 78 #include <sys/mount.h> 79 #include <sys/vnode.h> 80 #include <sys/malloc.h> 81 #include <sys/signalvar.h> 82 83 #include <ufs/ufs/inode.h> 84 #include <ufs/ufs/ufs_extern.h> 85 #include <ufs/ext2fs/ext2fs.h> 86 #include <ufs/ext2fs/ext2fs_extern.h> 87 88 89 #define doclusterread 0 /* XXX underway */ 90 #define doclusterwrite 0 91 92 /* 93 * Vnode op for reading. 94 */ 95 /* ARGSUSED */ 96 int 97 ext2fs_read(v) 98 void *v; 99 { 100 struct vop_read_args /* { 101 struct vnode *a_vp; 102 struct uio *a_uio; 103 int a_ioflag; 104 struct ucred *a_cred; 105 } */ *ap = v; 106 struct vnode *vp; 107 struct inode *ip; 108 struct uio *uio; 109 struct m_ext2fs *fs; 110 struct buf *bp; 111 void *win; 112 vsize_t bytelen; 113 daddr_t lbn, nextlbn; 114 off_t bytesinfile; 115 long size, xfersize, blkoffset; 116 int error; 117 118 vp = ap->a_vp; 119 ip = VTOI(vp); 120 uio = ap->a_uio; 121 122 #ifdef DIAGNOSTIC 123 if (uio->uio_rw != UIO_READ) 124 panic("%s: mode", "ext2fs_read"); 125 126 if (vp->v_type == VLNK) { 127 if ((int)ip->i_e2fs_size < vp->v_mount->mnt_maxsymlinklen || 128 (vp->v_mount->mnt_maxsymlinklen == 0 && 129 ip->i_e2fs_nblock == 0)) 130 panic("%s: short symlink", "ext2fs_read"); 131 } else if (vp->v_type != VREG && vp->v_type != VDIR) 132 panic("%s: type %d", "ext2fs_read", vp->v_type); 133 #endif 134 fs = ip->i_e2fs; 135 if ((u_int64_t)uio->uio_offset > 136 ((u_int64_t)0x80000000 * fs->e2fs_bsize - 1)) 137 return (EFBIG); 138 if (uio->uio_resid == 0) 139 return (0); 140 if (uio->uio_offset >= ip->i_e2fs_size) 141 return (0); 142 143 if (vp->v_type == VREG) { 144 error = 0; 145 while (uio->uio_resid > 0) { 146 bytelen = MIN(ip->i_e2fs_size - uio->uio_offset, 147 uio->uio_resid); 148 149 if (bytelen == 0) { 150 break; 151 } 152 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 153 &bytelen, UBC_READ); 154 error = uiomove(win, bytelen, uio); 155 ubc_release(win, 0); 156 if (error) { 157 break; 158 } 159 } 160 goto out; 161 } 162 163 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 164 if ((bytesinfile = ip->i_e2fs_size - uio->uio_offset) <= 0) 165 break; 166 lbn = lblkno(fs, uio->uio_offset); 167 nextlbn = lbn + 1; 168 size = fs->e2fs_bsize; 169 blkoffset = blkoff(fs, uio->uio_offset); 170 xfersize = fs->e2fs_bsize - blkoffset; 171 if (uio->uio_resid < xfersize) 172 xfersize = uio->uio_resid; 173 if (bytesinfile < xfersize) 174 xfersize = bytesinfile; 175 176 if (lblktosize(fs, nextlbn) >= ip->i_e2fs_size) 177 error = bread(vp, lbn, size, NOCRED, &bp); 178 else { 179 int nextsize = fs->e2fs_bsize; 180 error = breadn(vp, lbn, 181 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 182 } 183 if (error) 184 break; 185 186 /* 187 * We should only get non-zero b_resid when an I/O error 188 * has occurred, which should cause us to break above. 189 * However, if the short read did not cause an error, 190 * then we want to ensure that we do not uiomove bad 191 * or uninitialized data. 192 */ 193 size -= bp->b_resid; 194 if (size < xfersize) { 195 if (size == 0) 196 break; 197 xfersize = size; 198 } 199 error = uiomove((char *)bp->b_data + blkoffset, xfersize, uio); 200 if (error) 201 break; 202 brelse(bp); 203 } 204 if (bp != NULL) 205 brelse(bp); 206 207 out: 208 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) { 209 ip->i_flag |= IN_ACCESS; 210 if ((ap->a_ioflag & IO_SYNC) == IO_SYNC) 211 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_WAIT); 212 } 213 return (error); 214 } 215 216 /* 217 * Vnode op for writing. 218 */ 219 int 220 ext2fs_write(v) 221 void *v; 222 { 223 struct vop_write_args /* { 224 struct vnode *a_vp; 225 struct uio *a_uio; 226 int a_ioflag; 227 struct ucred *a_cred; 228 } */ *ap = v; 229 struct vnode *vp; 230 struct uio *uio; 231 struct inode *ip; 232 struct m_ext2fs *fs; 233 struct buf *bp; 234 struct proc *p; 235 daddr_t lbn; 236 off_t osize; 237 int blkoffset, error, flags, ioflag, resid, xfersize; 238 vsize_t bytelen; 239 void *win; 240 off_t oldoff; 241 boolean_t async; 242 int extended=0; 243 244 ioflag = ap->a_ioflag; 245 uio = ap->a_uio; 246 vp = ap->a_vp; 247 ip = VTOI(vp); 248 error = 0; 249 250 #ifdef DIAGNOSTIC 251 if (uio->uio_rw != UIO_WRITE) 252 panic("%s: mode", "ext2fs_write"); 253 #endif 254 255 switch (vp->v_type) { 256 case VREG: 257 if (ioflag & IO_APPEND) 258 uio->uio_offset = ip->i_e2fs_size; 259 if ((ip->i_e2fs_flags & EXT2_APPEND) && 260 uio->uio_offset != ip->i_e2fs_size) 261 return (EPERM); 262 /* FALLTHROUGH */ 263 case VLNK: 264 break; 265 case VDIR: 266 if ((ioflag & IO_SYNC) == 0) 267 panic("%s: nonsync dir write", "ext2fs_write"); 268 break; 269 default: 270 panic("%s: type", "ext2fs_write"); 271 } 272 273 fs = ip->i_e2fs; 274 if (uio->uio_offset < 0 || 275 (u_int64_t)uio->uio_offset + uio->uio_resid > 276 ((u_int64_t)0x80000000 * fs->e2fs_bsize - 1)) 277 return (EFBIG); 278 /* 279 * Maybe this should be above the vnode op call, but so long as 280 * file servers have no limits, I don't think it matters. 281 */ 282 p = uio->uio_procp; 283 if (vp->v_type == VREG && p && 284 uio->uio_offset + uio->uio_resid > 285 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 286 psignal(p, SIGXFSZ); 287 return (EFBIG); 288 } 289 if (uio->uio_resid == 0) 290 return (0); 291 292 async = vp->v_mount->mnt_flag & MNT_ASYNC; 293 resid = uio->uio_resid; 294 osize = ip->i_e2fs_size; 295 296 if (vp->v_type == VREG) { 297 while (uio->uio_resid > 0) { 298 oldoff = uio->uio_offset; 299 blkoffset = blkoff(fs, uio->uio_offset); 300 bytelen = MIN(fs->e2fs_bsize - blkoffset, 301 uio->uio_resid); 302 303 error = ufs_balloc_range(vp, uio->uio_offset, 304 bytelen, ap->a_cred, 0); 305 if (error) { 306 break; 307 } 308 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 309 &bytelen, UBC_WRITE); 310 error = uiomove(win, bytelen, uio); 311 ubc_release(win, 0); 312 if (error) { 313 break; 314 } 315 316 /* 317 * update UVM's notion of the size now that we've 318 * copied the data into the vnode's pages. 319 */ 320 321 if (vp->v_size < uio->uio_offset) { 322 uvm_vnp_setsize(vp, uio->uio_offset); 323 extended = 1; 324 } 325 326 /* 327 * flush what we just wrote if necessary. 328 * XXXUBC simplistic async flushing. 329 */ 330 331 if (!async && oldoff >> 16 != uio->uio_offset >> 16) { 332 simple_lock(&vp->v_interlock); 333 error = VOP_PUTPAGES(vp, (oldoff >> 16) << 16, 334 (uio->uio_offset >> 16) << 16, PGO_CLEANIT); 335 } 336 } 337 if (error == 0 && ioflag & IO_SYNC) { 338 simple_lock(&vp->v_interlock); 339 error = VOP_PUTPAGES(vp, trunc_page(oldoff), 340 round_page(blkroundup(fs, uio->uio_offset)), 341 PGO_CLEANIT | PGO_SYNCIO); 342 } 343 344 goto out; 345 } 346 347 flags = ioflag & IO_SYNC ? B_SYNC : 0; 348 for (error = 0; uio->uio_resid > 0;) { 349 lbn = lblkno(fs, uio->uio_offset); 350 blkoffset = blkoff(fs, uio->uio_offset); 351 xfersize = MIN(fs->e2fs_bsize - blkoffset, uio->uio_resid); 352 if (xfersize < fs->e2fs_bsize) 353 flags |= B_CLRBUF; 354 else 355 flags &= ~B_CLRBUF; 356 error = ext2fs_balloc(ip, 357 lbn, blkoffset + xfersize, ap->a_cred, &bp, flags); 358 if (error) 359 break; 360 if (ip->i_e2fs_size < uio->uio_offset + xfersize) { 361 ip->i_e2fs_size = uio->uio_offset + xfersize; 362 } 363 error = uiomove((char *)bp->b_data + blkoffset, xfersize, uio); 364 365 /* 366 * update UVM's notion of the size now that we've 367 * copied the data into the vnode's pages. 368 */ 369 370 if (vp->v_size < uio->uio_offset) { 371 uvm_vnp_setsize(vp, uio->uio_offset); 372 extended = 1; 373 } 374 375 if (ioflag & IO_SYNC) 376 (void)bwrite(bp); 377 else if (xfersize + blkoffset == fs->e2fs_bsize) 378 bawrite(bp); 379 else 380 bdwrite(bp); 381 if (error || xfersize == 0) 382 break; 383 } 384 385 /* 386 * If we successfully wrote any data, and we are not the superuser 387 * we clear the setuid and setgid bits as a precaution against 388 * tampering. 389 */ 390 391 out: 392 ip->i_flag |= IN_CHANGE | IN_UPDATE; 393 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0) 394 ip->i_e2fs_mode &= ~(ISUID | ISGID); 395 if (resid > uio->uio_resid) 396 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 397 if (error) { 398 (void) VOP_TRUNCATE(vp, osize, ioflag & IO_SYNC, ap->a_cred, 399 uio->uio_procp); 400 uio->uio_offset -= resid - uio->uio_resid; 401 uio->uio_resid = resid; 402 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC) == IO_SYNC) 403 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_WAIT); 404 KASSERT(vp->v_size == ip->i_e2fs_size); 405 return (error); 406 }
Cache object: e09c2a5b58d2d750c9e9b224442a712a
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