inode.c (10950B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/fs/affs/inode.c 4 * 5 * (c) 1996 Hans-Joachim Widmaier - Rewritten 6 * 7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. 8 * 9 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. 10 * 11 * (C) 1991 Linus Torvalds - minix filesystem 12 */ 13#include <linux/sched.h> 14#include <linux/cred.h> 15#include <linux/gfp.h> 16#include "affs.h" 17 18struct inode *affs_iget(struct super_block *sb, unsigned long ino) 19{ 20 struct affs_sb_info *sbi = AFFS_SB(sb); 21 struct buffer_head *bh; 22 struct affs_tail *tail; 23 struct inode *inode; 24 u32 block; 25 u32 size; 26 u32 prot; 27 u16 id; 28 29 inode = iget_locked(sb, ino); 30 if (!inode) 31 return ERR_PTR(-ENOMEM); 32 if (!(inode->i_state & I_NEW)) 33 return inode; 34 35 pr_debug("affs_iget(%lu)\n", inode->i_ino); 36 37 block = inode->i_ino; 38 bh = affs_bread(sb, block); 39 if (!bh) { 40 affs_warning(sb, "read_inode", "Cannot read block %d", block); 41 goto bad_inode; 42 } 43 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { 44 affs_warning(sb,"read_inode", 45 "Checksum or type (ptype=%d) error on inode %d", 46 AFFS_HEAD(bh)->ptype, block); 47 goto bad_inode; 48 } 49 50 tail = AFFS_TAIL(sb, bh); 51 prot = be32_to_cpu(tail->protect); 52 53 inode->i_size = 0; 54 set_nlink(inode, 1); 55 inode->i_mode = 0; 56 AFFS_I(inode)->i_extcnt = 1; 57 AFFS_I(inode)->i_ext_last = ~1; 58 AFFS_I(inode)->i_protect = prot; 59 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 60 AFFS_I(inode)->i_blkcnt = 0; 61 AFFS_I(inode)->i_lc = NULL; 62 AFFS_I(inode)->i_lc_size = 0; 63 AFFS_I(inode)->i_lc_shift = 0; 64 AFFS_I(inode)->i_lc_mask = 0; 65 AFFS_I(inode)->i_ac = NULL; 66 AFFS_I(inode)->i_ext_bh = NULL; 67 AFFS_I(inode)->mmu_private = 0; 68 AFFS_I(inode)->i_lastalloc = 0; 69 AFFS_I(inode)->i_pa_cnt = 0; 70 71 if (affs_test_opt(sbi->s_flags, SF_SETMODE)) 72 inode->i_mode = sbi->s_mode; 73 else 74 inode->i_mode = affs_prot_to_mode(prot); 75 76 id = be16_to_cpu(tail->uid); 77 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID)) 78 inode->i_uid = sbi->s_uid; 79 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) 80 i_uid_write(inode, 0); 81 else 82 i_uid_write(inode, id); 83 84 id = be16_to_cpu(tail->gid); 85 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID)) 86 inode->i_gid = sbi->s_gid; 87 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) 88 i_gid_write(inode, 0); 89 else 90 i_gid_write(inode, id); 91 92 switch (be32_to_cpu(tail->stype)) { 93 case ST_ROOT: 94 inode->i_uid = sbi->s_uid; 95 inode->i_gid = sbi->s_gid; 96 fallthrough; 97 case ST_USERDIR: 98 if (be32_to_cpu(tail->stype) == ST_USERDIR || 99 affs_test_opt(sbi->s_flags, SF_SETMODE)) { 100 if (inode->i_mode & S_IRUSR) 101 inode->i_mode |= S_IXUSR; 102 if (inode->i_mode & S_IRGRP) 103 inode->i_mode |= S_IXGRP; 104 if (inode->i_mode & S_IROTH) 105 inode->i_mode |= S_IXOTH; 106 inode->i_mode |= S_IFDIR; 107 } else 108 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; 109 /* Maybe it should be controlled by mount parameter? */ 110 //inode->i_mode |= S_ISVTX; 111 inode->i_op = &affs_dir_inode_operations; 112 inode->i_fop = &affs_dir_operations; 113 break; 114 case ST_LINKDIR: 115#if 0 116 affs_warning(sb, "read_inode", "inode is LINKDIR"); 117 goto bad_inode; 118#else 119 inode->i_mode |= S_IFDIR; 120 /* ... and leave ->i_op and ->i_fop pointing to empty */ 121 break; 122#endif 123 case ST_LINKFILE: 124 affs_warning(sb, "read_inode", "inode is LINKFILE"); 125 goto bad_inode; 126 case ST_FILE: 127 size = be32_to_cpu(tail->size); 128 inode->i_mode |= S_IFREG; 129 AFFS_I(inode)->mmu_private = inode->i_size = size; 130 if (inode->i_size) { 131 AFFS_I(inode)->i_blkcnt = (size - 1) / 132 sbi->s_data_blksize + 1; 133 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / 134 sbi->s_hashsize + 1; 135 } 136 if (tail->link_chain) 137 set_nlink(inode, 2); 138 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ? 139 &affs_aops_ofs : &affs_aops; 140 inode->i_op = &affs_file_inode_operations; 141 inode->i_fop = &affs_file_operations; 142 break; 143 case ST_SOFTLINK: 144 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table); 145 inode->i_mode |= S_IFLNK; 146 inode_nohighmem(inode); 147 inode->i_op = &affs_symlink_inode_operations; 148 inode->i_data.a_ops = &affs_symlink_aops; 149 break; 150 } 151 152 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec 153 = (be32_to_cpu(tail->change.days) * 86400LL + 154 be32_to_cpu(tail->change.mins) * 60 + 155 be32_to_cpu(tail->change.ticks) / 50 + 156 AFFS_EPOCH_DELTA) + 157 sys_tz.tz_minuteswest * 60; 158 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; 159 affs_brelse(bh); 160 unlock_new_inode(inode); 161 return inode; 162 163bad_inode: 164 affs_brelse(bh); 165 iget_failed(inode); 166 return ERR_PTR(-EIO); 167} 168 169int 170affs_write_inode(struct inode *inode, struct writeback_control *wbc) 171{ 172 struct super_block *sb = inode->i_sb; 173 struct buffer_head *bh; 174 struct affs_tail *tail; 175 uid_t uid; 176 gid_t gid; 177 178 pr_debug("write_inode(%lu)\n", inode->i_ino); 179 180 if (!inode->i_nlink) 181 // possibly free block 182 return 0; 183 bh = affs_bread(sb, inode->i_ino); 184 if (!bh) { 185 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); 186 return -EIO; 187 } 188 tail = AFFS_TAIL(sb, bh); 189 if (tail->stype == cpu_to_be32(ST_ROOT)) { 190 affs_secs_to_datestamp(inode->i_mtime.tv_sec, 191 &AFFS_ROOT_TAIL(sb, bh)->root_change); 192 } else { 193 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 194 tail->size = cpu_to_be32(inode->i_size); 195 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change); 196 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 197 uid = i_uid_read(inode); 198 gid = i_gid_read(inode); 199 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) { 200 if (uid == 0 || uid == 0xFFFF) 201 uid = uid ^ ~0; 202 if (gid == 0 || gid == 0xFFFF) 203 gid = gid ^ ~0; 204 } 205 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID)) 206 tail->uid = cpu_to_be16(uid); 207 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID)) 208 tail->gid = cpu_to_be16(gid); 209 } 210 } 211 affs_fix_checksum(sb, bh); 212 mark_buffer_dirty_inode(bh, inode); 213 affs_brelse(bh); 214 affs_free_prealloc(inode); 215 return 0; 216} 217 218int 219affs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry, 220 struct iattr *attr) 221{ 222 struct inode *inode = d_inode(dentry); 223 int error; 224 225 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); 226 227 error = setattr_prepare(&init_user_ns, dentry, attr); 228 if (error) 229 goto out; 230 231 if (((attr->ia_valid & ATTR_UID) && 232 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || 233 ((attr->ia_valid & ATTR_GID) && 234 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || 235 ((attr->ia_valid & ATTR_MODE) && 236 (AFFS_SB(inode->i_sb)->s_flags & 237 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { 238 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) 239 error = -EPERM; 240 goto out; 241 } 242 243 if ((attr->ia_valid & ATTR_SIZE) && 244 attr->ia_size != i_size_read(inode)) { 245 error = inode_newsize_ok(inode, attr->ia_size); 246 if (error) 247 return error; 248 249 truncate_setsize(inode, attr->ia_size); 250 affs_truncate(inode); 251 } 252 253 setattr_copy(&init_user_ns, inode, attr); 254 mark_inode_dirty(inode); 255 256 if (attr->ia_valid & ATTR_MODE) 257 affs_mode_to_prot(inode); 258out: 259 return error; 260} 261 262void 263affs_evict_inode(struct inode *inode) 264{ 265 unsigned long cache_page; 266 pr_debug("evict_inode(ino=%lu, nlink=%u)\n", 267 inode->i_ino, inode->i_nlink); 268 truncate_inode_pages_final(&inode->i_data); 269 270 if (!inode->i_nlink) { 271 inode->i_size = 0; 272 affs_truncate(inode); 273 } 274 275 invalidate_inode_buffers(inode); 276 clear_inode(inode); 277 affs_free_prealloc(inode); 278 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 279 if (cache_page) { 280 pr_debug("freeing ext cache\n"); 281 AFFS_I(inode)->i_lc = NULL; 282 AFFS_I(inode)->i_ac = NULL; 283 free_page(cache_page); 284 } 285 affs_brelse(AFFS_I(inode)->i_ext_bh); 286 AFFS_I(inode)->i_ext_last = ~1; 287 AFFS_I(inode)->i_ext_bh = NULL; 288 289 if (!inode->i_nlink) 290 affs_free_block(inode->i_sb, inode->i_ino); 291} 292 293struct inode * 294affs_new_inode(struct inode *dir) 295{ 296 struct super_block *sb = dir->i_sb; 297 struct inode *inode; 298 u32 block; 299 struct buffer_head *bh; 300 301 if (!(inode = new_inode(sb))) 302 goto err_inode; 303 304 if (!(block = affs_alloc_block(dir, dir->i_ino))) 305 goto err_block; 306 307 bh = affs_getzeroblk(sb, block); 308 if (!bh) 309 goto err_bh; 310 mark_buffer_dirty_inode(bh, inode); 311 affs_brelse(bh); 312 313 inode->i_uid = current_fsuid(); 314 inode->i_gid = current_fsgid(); 315 inode->i_ino = block; 316 set_nlink(inode, 1); 317 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 318 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 319 AFFS_I(inode)->i_blkcnt = 0; 320 AFFS_I(inode)->i_lc = NULL; 321 AFFS_I(inode)->i_lc_size = 0; 322 AFFS_I(inode)->i_lc_shift = 0; 323 AFFS_I(inode)->i_lc_mask = 0; 324 AFFS_I(inode)->i_ac = NULL; 325 AFFS_I(inode)->i_ext_bh = NULL; 326 AFFS_I(inode)->mmu_private = 0; 327 AFFS_I(inode)->i_protect = 0; 328 AFFS_I(inode)->i_lastalloc = 0; 329 AFFS_I(inode)->i_pa_cnt = 0; 330 AFFS_I(inode)->i_extcnt = 1; 331 AFFS_I(inode)->i_ext_last = ~1; 332 333 insert_inode_hash(inode); 334 335 return inode; 336 337err_bh: 338 affs_free_block(sb, block); 339err_block: 340 iput(inode); 341err_inode: 342 return NULL; 343} 344 345/* 346 * Add an entry to a directory. Create the header block 347 * and insert it into the hash table. 348 */ 349 350int 351affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 352{ 353 struct super_block *sb = dir->i_sb; 354 struct buffer_head *inode_bh = NULL; 355 struct buffer_head *bh; 356 u32 block = 0; 357 int retval; 358 359 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, 360 dir->i_ino, inode->i_ino, dentry, type); 361 362 retval = -EIO; 363 bh = affs_bread(sb, inode->i_ino); 364 if (!bh) 365 goto done; 366 367 affs_lock_link(inode); 368 switch (type) { 369 case ST_LINKFILE: 370 case ST_LINKDIR: 371 retval = -ENOSPC; 372 block = affs_alloc_block(dir, dir->i_ino); 373 if (!block) 374 goto err; 375 retval = -EIO; 376 inode_bh = bh; 377 bh = affs_getzeroblk(sb, block); 378 if (!bh) 379 goto err; 380 break; 381 default: 382 break; 383 } 384 385 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 386 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 387 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 388 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 389 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 390 391 if (inode_bh) { 392 __be32 chain; 393 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 394 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 395 AFFS_TAIL(sb, bh)->link_chain = chain; 396 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 397 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 398 mark_buffer_dirty_inode(inode_bh, inode); 399 set_nlink(inode, 2); 400 ihold(inode); 401 } 402 affs_fix_checksum(sb, bh); 403 mark_buffer_dirty_inode(bh, inode); 404 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 405 406 affs_lock_dir(dir); 407 retval = affs_insert_hash(dir, bh); 408 mark_buffer_dirty_inode(bh, inode); 409 affs_unlock_dir(dir); 410 affs_unlock_link(inode); 411 412 d_instantiate(dentry, inode); 413done: 414 affs_brelse(inode_bh); 415 affs_brelse(bh); 416 return retval; 417err: 418 if (block) 419 affs_free_block(sb, block); 420 affs_unlock_link(inode); 421 goto done; 422}