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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 | /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Copyright (C) 2000 Stelias Computing, Inc. * Copyright (C) 2000 Red Hat, Inc. * Copyright (C) 2000 Mountain View Data, Inc. * * Extended Attribute Support * Copyright (C) 2001 Shirish H. Phatak, Tacit Networks, Inc. * * This file is part of InterMezzo, http://www.inter-mezzo.org. * * InterMezzo is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * InterMezzo is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with InterMezzo; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <stdarg.h> #include <asm/bitops.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/ext2_fs.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/sched.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/locks.h> #include <linux/blkdev.h> #include <linux/init.h> #define __NO_VERSION__ #include <linux/module.h> #include <linux/fsfilter.h> #include <linux/intermezzo_fs.h> int filter_print_entry = 0; int filter_debug = 0xfffffff; /* * The function in this file are responsible for setting up the * correct methods layered file systems like InterMezzo and snapfs */ static struct filter_fs filter_oppar[FILTER_FS_TYPES]; /* get to the upper methods (intermezzo, snapfs) */ inline struct super_operations *filter_c2usops(struct filter_fs *cache) { return &cache->o_fops.filter_sops; } inline struct inode_operations *filter_c2udiops(struct filter_fs *cache) { return &cache->o_fops.filter_dir_iops; } inline struct inode_operations *filter_c2ufiops(struct filter_fs *cache) { return &cache->o_fops.filter_file_iops; } inline struct inode_operations *filter_c2usiops(struct filter_fs *cache) { return &cache->o_fops.filter_sym_iops; } inline struct file_operations *filter_c2udfops(struct filter_fs *cache) { return &cache->o_fops.filter_dir_fops; } inline struct file_operations *filter_c2uffops(struct filter_fs *cache) { return &cache->o_fops.filter_file_fops; } inline struct file_operations *filter_c2usfops(struct filter_fs *cache) { return &cache->o_fops.filter_sym_fops; } inline struct dentry_operations *filter_c2udops(struct filter_fs *cache) { return &cache->o_fops.filter_dentry_ops; } /* get to the cache (lower) methods */ inline struct super_operations *filter_c2csops(struct filter_fs *cache) { return cache->o_caops.cache_sops; } inline struct inode_operations *filter_c2cdiops(struct filter_fs *cache) { return cache->o_caops.cache_dir_iops; } inline struct inode_operations *filter_c2cfiops(struct filter_fs *cache) { return cache->o_caops.cache_file_iops; } inline struct inode_operations *filter_c2csiops(struct filter_fs *cache) { return cache->o_caops.cache_sym_iops; } inline struct file_operations *filter_c2cdfops(struct filter_fs *cache) { return cache->o_caops.cache_dir_fops; } inline struct file_operations *filter_c2cffops(struct filter_fs *cache) { return cache->o_caops.cache_file_fops; } inline struct file_operations *filter_c2csfops(struct filter_fs *cache) { return cache->o_caops.cache_sym_fops; } inline struct dentry_operations *filter_c2cdops(struct filter_fs *cache) { return cache->o_caops.cache_dentry_ops; } void filter_setup_journal_ops(struct filter_fs *ops, char *cache_type) { if ( strlen(cache_type) == strlen("ext2") && memcmp(cache_type, "ext2", strlen("ext2")) == 0 ) { #if CONFIG_EXT2_FS ops->o_trops = &presto_ext2_journal_ops; #else ops->o_trops = NULL; #endif FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("ext3") && memcmp(cache_type, "ext3", strlen("ext3")) == 0 ) { #if defined(CONFIG_EXT3_FS) || defined (CONFIG_EXT3_FS_MODULE) ops->o_trops = &presto_ext3_journal_ops; #else ops->o_trops = NULL; #endif FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("tmpfs") && memcmp(cache_type, "tmpfs", strlen("tmpfs")) == 0 ) { #if defined(CONFIG_TMPFS) ops->o_trops = &presto_tmpfs_journal_ops; #else ops->o_trops = NULL; #endif FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("reiserfs") && memcmp(cache_type, "reiserfs", strlen("reiserfs")) == 0 ) { #if 0 /* #if defined(CONFIG_REISERFS_FS) || defined(CONFIG_REISERFS_FS_MODULE) */ ops->o_trops = &presto_reiserfs_journal_ops; #else ops->o_trops = NULL; #endif FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("xfs") && memcmp(cache_type, "xfs", strlen("xfs")) == 0 ) { #if 0 /*#if defined(CONFIG_XFS_FS) || defined (CONFIG_XFS_FS_MODULE) */ ops->o_trops = &presto_xfs_journal_ops; #else ops->o_trops = NULL; #endif FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("obdfs") && memcmp(cache_type, "obdfs", strlen("obdfs")) == 0 ) { #if defined(CONFIG_OBDFS_FS) || defined (CONFIG_OBDFS_FS_MODULE) ops->o_trops = presto_obdfs_journal_ops; #else ops->o_trops = NULL; #endif FDEBUG(D_SUPER, "ops at %p\n", ops); } } /* find the cache for this FS */ struct filter_fs *filter_get_filter_fs(const char *cache_type) { struct filter_fs *ops = NULL; FENTRY; if ( strlen(cache_type) == strlen("ext2") && memcmp(cache_type, "ext2", strlen("ext2")) == 0 ) { ops = &filter_oppar[FILTER_FS_EXT2]; FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("xfs") && memcmp(cache_type, "xfs", strlen("xfs")) == 0 ) { ops = &filter_oppar[FILTER_FS_XFS]; FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("ext3") && memcmp(cache_type, "ext3", strlen("ext3")) == 0 ) { ops = &filter_oppar[FILTER_FS_EXT3]; FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("tmpfs") && memcmp(cache_type, "tmpfs", strlen("tmpfs")) == 0 ) { ops = &filter_oppar[FILTER_FS_TMPFS]; FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("reiserfs") && memcmp(cache_type, "reiserfs", strlen("reiserfs")) == 0 ) { ops = &filter_oppar[FILTER_FS_REISERFS]; FDEBUG(D_SUPER, "ops at %p\n", ops); } if ( strlen(cache_type) == strlen("obdfs") && memcmp(cache_type, "obdfs", strlen("obdfs")) == 0 ) { ops = &filter_oppar[FILTER_FS_OBDFS]; FDEBUG(D_SUPER, "ops at %p\n", ops); } if (ops == NULL) { CERROR("prepare to die: unrecognized cache type for Filter\n"); } FEXIT; return ops; } /* * Frobnicate the InterMezzo operations * this establishes the link between the InterMezzo file system * and the underlying file system used for the cache. */ void filter_setup_super_ops(struct filter_fs *cache, struct super_operations *cache_sops, struct super_operations *filter_sops) { /* Get ptr to the shared struct snapfs_ops structure. */ struct filter_ops *props = &cache->o_fops; /* Get ptr to the shared struct cache_ops structure. */ struct cache_ops *caops = &cache->o_caops; FENTRY; if ( cache->o_flags & FILTER_DID_SUPER_OPS ) { FEXIT; return; } cache->o_flags |= FILTER_DID_SUPER_OPS; /* Set the cache superblock operations to point to the superblock operations of the underlying file system. */ caops->cache_sops = cache_sops; /* * Copy the cache (real fs) superblock ops to the "filter" * superblock ops as defaults. Some will be changed below */ memcpy(&props->filter_sops, cache_sops, sizeof(*cache_sops)); /* 'put_super' unconditionally is that of filter */ if (filter_sops->put_super) { props->filter_sops.put_super = filter_sops->put_super; } if (cache_sops->read_inode) { props->filter_sops.read_inode = filter_sops->read_inode; FDEBUG(D_INODE, "setting filter_read_inode, cache_ops %p, cache %p, ri at %p\n", cache, cache, props->filter_sops.read_inode); } if (cache_sops->remount_fs) props->filter_sops.remount_fs = filter_sops->remount_fs; FEXIT; } void filter_setup_dir_ops(struct filter_fs *cache, struct inode *inode, struct inode_operations *filter_iops, struct file_operations *filter_fops) { struct inode_operations *cache_filter_iops; struct inode_operations *cache_iops = inode->i_op; struct file_operations *cache_fops = inode->i_fop; FENTRY; if ( cache->o_flags & FILTER_DID_DIR_OPS ) { FEXIT; return; } cache->o_flags |= FILTER_DID_DIR_OPS; /* former ops become cache_ops */ cache->o_caops.cache_dir_iops = cache_iops; cache->o_caops.cache_dir_fops = cache_fops; FDEBUG(D_SUPER, "filter at %p, cache iops %p, iops %p\n", cache, cache_iops, filter_c2udiops(cache)); /* setup our dir iops: copy and modify */ memcpy(filter_c2udiops(cache), cache_iops, sizeof(*cache_iops)); /* abbreviate */ cache_filter_iops = filter_c2udiops(cache); /* methods that filter if cache filesystem has these ops */ if (cache_iops->lookup && filter_iops->lookup) cache_filter_iops->lookup = filter_iops->lookup; if (cache_iops->create && filter_iops->create) cache_filter_iops->create = filter_iops->create; if (cache_iops->link && filter_iops->link) cache_filter_iops->link = filter_iops->link; if (cache_iops->unlink && filter_iops->unlink) cache_filter_iops->unlink = filter_iops->unlink; if (cache_iops->mkdir && filter_iops->mkdir) cache_filter_iops->mkdir = filter_iops->mkdir; if (cache_iops->rmdir && filter_iops->rmdir) cache_filter_iops->rmdir = filter_iops->rmdir; if (cache_iops->symlink && filter_iops->symlink) cache_filter_iops->symlink = filter_iops->symlink; if (cache_iops->rename && filter_iops->rename) cache_filter_iops->rename = filter_iops->rename; if (cache_iops->mknod && filter_iops->mknod) cache_filter_iops->mknod = filter_iops->mknod; if (cache_iops->permission && filter_iops->permission) cache_filter_iops->permission = filter_iops->permission; if (cache_iops->getattr) cache_filter_iops->getattr = filter_iops->getattr; /* Some filesystems do not use a setattr method of their own instead relying on inode_setattr/write_inode. We still need to journal these so we make setattr an unconditional operation. XXX: we should probably check for write_inode. SHP */ /*if (cache_iops->setattr)*/ cache_filter_iops->setattr = filter_iops->setattr; #ifdef CONFIG_FS_EXT_ATTR /* For now we assume that posix acls are handled through extended * attributes. If this is not the case, we must explicitly trap * posix_set_acl. SHP */ if (cache_iops->set_ext_attr && filter_iops->set_ext_attr) cache_filter_iops->set_ext_attr = filter_iops->set_ext_attr; #endif /* copy dir fops */ memcpy(filter_c2udfops(cache), cache_fops, sizeof(*cache_fops)); /* unconditional filtering operations */ filter_c2udfops(cache)->ioctl = filter_fops->ioctl; FEXIT; } void filter_setup_file_ops(struct filter_fs *cache, struct inode *inode, struct inode_operations *filter_iops, struct file_operations *filter_fops) { struct inode_operations *pr_iops; struct inode_operations *cache_iops = inode->i_op; struct file_operations *cache_fops = inode->i_fop; FENTRY; if ( cache->o_flags & FILTER_DID_FILE_OPS ) { FEXIT; return; } cache->o_flags |= FILTER_DID_FILE_OPS; /* steal the old ops */ /* former ops become cache_ops */ cache->o_caops.cache_file_iops = cache_iops; cache->o_caops.cache_file_fops = cache_fops; /* abbreviate */ pr_iops = filter_c2ufiops(cache); /* setup our dir iops: copy and modify */ memcpy(pr_iops, cache_iops, sizeof(*cache_iops)); /* copy dir fops */ CERROR("*** cache file ops at %p\n", cache_fops); memcpy(filter_c2uffops(cache), cache_fops, sizeof(*cache_fops)); /* assign */ /* See comments above in filter_setup_dir_ops. SHP */ /*if (cache_iops->setattr)*/ pr_iops->setattr = filter_iops->setattr; if (cache_iops->getattr) pr_iops->getattr = filter_iops->getattr; /* XXX Should this be conditional rmr ? */ pr_iops->permission = filter_iops->permission; #ifdef CONFIG_FS_EXT_ATTR /* For now we assume that posix acls are handled through extended * attributes. If this is not the case, we must explicitly trap and * posix_set_acl */ if (cache_iops->set_ext_attr && filter_iops->set_ext_attr) pr_iops->set_ext_attr = filter_iops->set_ext_attr; #endif /* unconditional filtering operations */ filter_c2uffops(cache)->open = filter_fops->open; filter_c2uffops(cache)->release = filter_fops->release; filter_c2uffops(cache)->write = filter_fops->write; filter_c2uffops(cache)->ioctl = filter_fops->ioctl; FEXIT; } /* XXX in 2.3 there are "fast" and "slow" symlink ops for ext2 XXX */ void filter_setup_symlink_ops(struct filter_fs *cache, struct inode *inode, struct inode_operations *filter_iops, struct file_operations *filter_fops) { struct inode_operations *pr_iops; struct inode_operations *cache_iops = inode->i_op; struct file_operations *cache_fops = inode->i_fop; FENTRY; if ( cache->o_flags & FILTER_DID_SYMLINK_OPS ) { FEXIT; return; } cache->o_flags |= FILTER_DID_SYMLINK_OPS; /* steal the old ops */ cache->o_caops.cache_sym_iops = cache_iops; cache->o_caops.cache_sym_fops = cache_fops; /* abbreviate */ pr_iops = filter_c2usiops(cache); /* setup our dir iops: copy and modify */ memcpy(pr_iops, cache_iops, sizeof(*cache_iops)); /* See comments above in filter_setup_dir_ops. SHP */ /* if (cache_iops->setattr) */ pr_iops->setattr = filter_iops->setattr; if (cache_iops->getattr) pr_iops->getattr = filter_iops->getattr; /* assign */ /* copy fops - careful for symlinks they might be NULL */ if ( cache_fops ) { memcpy(filter_c2usfops(cache), cache_fops, sizeof(*cache_fops)); } FEXIT; } void filter_setup_dentry_ops(struct filter_fs *cache, struct dentry_operations *cache_dop, struct dentry_operations *filter_dop) { if ( cache->o_flags & FILTER_DID_DENTRY_OPS ) { FEXIT; return; } cache->o_flags |= FILTER_DID_DENTRY_OPS; cache->o_caops.cache_dentry_ops = cache_dop; memcpy(&cache->o_fops.filter_dentry_ops, filter_dop, sizeof(*filter_dop)); if (cache_dop && cache_dop != filter_dop && cache_dop->d_revalidate){ CERROR("WARNING: filter overriding revalidation!\n"); } return; } |