1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2017-2018 HUAWEI, Inc. 4 * https://www.huawei.com/ 5 * Copyright (C) 2021, Alibaba Cloud 6 */ 7 #include "xattr.h" 8 9 #include <trace/events/erofs.h> 10 11 static void *erofs_read_inode(struct erofs_buf *buf, 12 struct inode *inode, unsigned int *ofs) 13 { 14 struct super_block *sb = inode->i_sb; 15 struct erofs_sb_info *sbi = EROFS_SB(sb); 16 struct erofs_inode *vi = EROFS_I(inode); 17 const erofs_off_t inode_loc = iloc(sbi, vi->nid); 18 19 erofs_blk_t blkaddr, nblks = 0; 20 void *kaddr; 21 struct erofs_inode_compact *dic; 22 struct erofs_inode_extended *die, *copied = NULL; 23 unsigned int ifmt; 24 int err; 25 26 blkaddr = erofs_blknr(inode_loc); 27 *ofs = erofs_blkoff(inode_loc); 28 29 erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u", 30 __func__, vi->nid, *ofs, blkaddr); 31 32 kaddr = erofs_read_metabuf(buf, sb, blkaddr, EROFS_KMAP); 33 if (IS_ERR(kaddr)) { 34 erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", 35 vi->nid, PTR_ERR(kaddr)); 36 return kaddr; 37 } 38 39 dic = kaddr + *ofs; 40 ifmt = le16_to_cpu(dic->i_format); 41 42 if (ifmt & ~EROFS_I_ALL) { 43 erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu", 44 ifmt, vi->nid); 45 err = -EOPNOTSUPP; 46 goto err_out; 47 } 48 49 vi->datalayout = erofs_inode_datalayout(ifmt); 50 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 51 erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu", 52 vi->datalayout, vi->nid); 53 err = -EOPNOTSUPP; 54 goto err_out; 55 } 56 57 switch (erofs_inode_version(ifmt)) { 58 case EROFS_INODE_LAYOUT_EXTENDED: 59 vi->inode_isize = sizeof(struct erofs_inode_extended); 60 /* check if the extended inode acrosses block boundary */ 61 if (*ofs + vi->inode_isize <= EROFS_BLKSIZ) { 62 *ofs += vi->inode_isize; 63 die = (struct erofs_inode_extended *)dic; 64 } else { 65 const unsigned int gotten = EROFS_BLKSIZ - *ofs; 66 67 copied = kmalloc(vi->inode_isize, GFP_NOFS); 68 if (!copied) { 69 err = -ENOMEM; 70 goto err_out; 71 } 72 memcpy(copied, dic, gotten); 73 kaddr = erofs_read_metabuf(buf, sb, blkaddr + 1, 74 EROFS_KMAP); 75 if (IS_ERR(kaddr)) { 76 erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld", 77 vi->nid, PTR_ERR(kaddr)); 78 kfree(copied); 79 return kaddr; 80 } 81 *ofs = vi->inode_isize - gotten; 82 memcpy((u8 *)copied + gotten, kaddr, *ofs); 83 die = copied; 84 } 85 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 86 87 inode->i_mode = le16_to_cpu(die->i_mode); 88 switch (inode->i_mode & S_IFMT) { 89 case S_IFREG: 90 case S_IFDIR: 91 case S_IFLNK: 92 vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr); 93 break; 94 case S_IFCHR: 95 case S_IFBLK: 96 inode->i_rdev = 97 new_decode_dev(le32_to_cpu(die->i_u.rdev)); 98 break; 99 case S_IFIFO: 100 case S_IFSOCK: 101 inode->i_rdev = 0; 102 break; 103 default: 104 goto bogusimode; 105 } 106 i_uid_write(inode, le32_to_cpu(die->i_uid)); 107 i_gid_write(inode, le32_to_cpu(die->i_gid)); 108 set_nlink(inode, le32_to_cpu(die->i_nlink)); 109 110 /* extended inode has its own timestamp */ 111 inode->i_ctime.tv_sec = le64_to_cpu(die->i_mtime); 112 inode->i_ctime.tv_nsec = le32_to_cpu(die->i_mtime_nsec); 113 114 inode->i_size = le64_to_cpu(die->i_size); 115 116 /* total blocks for compressed files */ 117 if (erofs_inode_is_data_compressed(vi->datalayout)) 118 nblks = le32_to_cpu(die->i_u.compressed_blocks); 119 else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) 120 /* fill chunked inode summary info */ 121 vi->chunkformat = le16_to_cpu(die->i_u.c.format); 122 kfree(copied); 123 copied = NULL; 124 break; 125 case EROFS_INODE_LAYOUT_COMPACT: 126 vi->inode_isize = sizeof(struct erofs_inode_compact); 127 *ofs += vi->inode_isize; 128 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 129 130 inode->i_mode = le16_to_cpu(dic->i_mode); 131 switch (inode->i_mode & S_IFMT) { 132 case S_IFREG: 133 case S_IFDIR: 134 case S_IFLNK: 135 vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr); 136 break; 137 case S_IFCHR: 138 case S_IFBLK: 139 inode->i_rdev = 140 new_decode_dev(le32_to_cpu(dic->i_u.rdev)); 141 break; 142 case S_IFIFO: 143 case S_IFSOCK: 144 inode->i_rdev = 0; 145 break; 146 default: 147 goto bogusimode; 148 } 149 i_uid_write(inode, le16_to_cpu(dic->i_uid)); 150 i_gid_write(inode, le16_to_cpu(dic->i_gid)); 151 set_nlink(inode, le16_to_cpu(dic->i_nlink)); 152 153 /* use build time for compact inodes */ 154 inode->i_ctime.tv_sec = sbi->build_time; 155 inode->i_ctime.tv_nsec = sbi->build_time_nsec; 156 157 inode->i_size = le32_to_cpu(dic->i_size); 158 if (erofs_inode_is_data_compressed(vi->datalayout)) 159 nblks = le32_to_cpu(dic->i_u.compressed_blocks); 160 else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) 161 vi->chunkformat = le16_to_cpu(dic->i_u.c.format); 162 break; 163 default: 164 erofs_err(inode->i_sb, 165 "unsupported on-disk inode version %u of nid %llu", 166 erofs_inode_version(ifmt), vi->nid); 167 err = -EOPNOTSUPP; 168 goto err_out; 169 } 170 171 if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { 172 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) { 173 erofs_err(inode->i_sb, 174 "unsupported chunk format %x of nid %llu", 175 vi->chunkformat, vi->nid); 176 err = -EOPNOTSUPP; 177 goto err_out; 178 } 179 vi->chunkbits = LOG_BLOCK_SIZE + 180 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK); 181 } 182 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec; 183 inode->i_atime.tv_sec = inode->i_ctime.tv_sec; 184 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec; 185 inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec; 186 187 inode->i_flags &= ~S_DAX; 188 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && 189 vi->datalayout == EROFS_INODE_FLAT_PLAIN) 190 inode->i_flags |= S_DAX; 191 if (!nblks) 192 /* measure inode.i_blocks as generic filesystems */ 193 inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9; 194 else 195 inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK; 196 return kaddr; 197 198 bogusimode: 199 erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu", 200 inode->i_mode, vi->nid); 201 err = -EFSCORRUPTED; 202 err_out: 203 DBG_BUGON(1); 204 kfree(copied); 205 erofs_put_metabuf(buf); 206 return ERR_PTR(err); 207 } 208 209 static int erofs_fill_symlink(struct inode *inode, void *kaddr, 210 unsigned int m_pofs) 211 { 212 struct erofs_inode *vi = EROFS_I(inode); 213 char *lnk; 214 215 /* if it cannot be handled with fast symlink scheme */ 216 if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 217 inode->i_size >= EROFS_BLKSIZ) { 218 inode->i_op = &erofs_symlink_iops; 219 return 0; 220 } 221 222 lnk = kmalloc(inode->i_size + 1, GFP_KERNEL); 223 if (!lnk) 224 return -ENOMEM; 225 226 m_pofs += vi->xattr_isize; 227 /* inline symlink data shouldn't cross block boundary */ 228 if (m_pofs + inode->i_size > EROFS_BLKSIZ) { 229 kfree(lnk); 230 erofs_err(inode->i_sb, 231 "inline data cross block boundary @ nid %llu", 232 vi->nid); 233 DBG_BUGON(1); 234 return -EFSCORRUPTED; 235 } 236 memcpy(lnk, kaddr + m_pofs, inode->i_size); 237 lnk[inode->i_size] = '\0'; 238 239 inode->i_link = lnk; 240 inode->i_op = &erofs_fast_symlink_iops; 241 return 0; 242 } 243 244 static int erofs_fill_inode(struct inode *inode, int isdir) 245 { 246 struct erofs_inode *vi = EROFS_I(inode); 247 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 248 void *kaddr; 249 unsigned int ofs; 250 int err = 0; 251 252 trace_erofs_fill_inode(inode, isdir); 253 254 /* read inode base data from disk */ 255 kaddr = erofs_read_inode(&buf, inode, &ofs); 256 if (IS_ERR(kaddr)) 257 return PTR_ERR(kaddr); 258 259 /* setup the new inode */ 260 switch (inode->i_mode & S_IFMT) { 261 case S_IFREG: 262 inode->i_op = &erofs_generic_iops; 263 if (erofs_inode_is_data_compressed(vi->datalayout)) 264 inode->i_fop = &generic_ro_fops; 265 else 266 inode->i_fop = &erofs_file_fops; 267 break; 268 case S_IFDIR: 269 inode->i_op = &erofs_dir_iops; 270 inode->i_fop = &erofs_dir_fops; 271 break; 272 case S_IFLNK: 273 err = erofs_fill_symlink(inode, kaddr, ofs); 274 if (err) 275 goto out_unlock; 276 inode_nohighmem(inode); 277 break; 278 case S_IFCHR: 279 case S_IFBLK: 280 case S_IFIFO: 281 case S_IFSOCK: 282 inode->i_op = &erofs_generic_iops; 283 init_special_inode(inode, inode->i_mode, inode->i_rdev); 284 goto out_unlock; 285 default: 286 err = -EFSCORRUPTED; 287 goto out_unlock; 288 } 289 290 if (erofs_inode_is_data_compressed(vi->datalayout)) { 291 if (!erofs_is_fscache_mode(inode->i_sb)) 292 err = z_erofs_fill_inode(inode); 293 else 294 err = -EOPNOTSUPP; 295 goto out_unlock; 296 } 297 inode->i_mapping->a_ops = &erofs_raw_access_aops; 298 #ifdef CONFIG_EROFS_FS_ONDEMAND 299 if (erofs_is_fscache_mode(inode->i_sb)) 300 inode->i_mapping->a_ops = &erofs_fscache_access_aops; 301 #endif 302 303 out_unlock: 304 erofs_put_metabuf(&buf); 305 return err; 306 } 307 308 /* 309 * erofs nid is 64bits, but i_ino is 'unsigned long', therefore 310 * we should do more for 32-bit platform to find the right inode. 311 */ 312 static int erofs_ilookup_test_actor(struct inode *inode, void *opaque) 313 { 314 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 315 316 return EROFS_I(inode)->nid == nid; 317 } 318 319 static int erofs_iget_set_actor(struct inode *inode, void *opaque) 320 { 321 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 322 323 inode->i_ino = erofs_inode_hash(nid); 324 return 0; 325 } 326 327 static inline struct inode *erofs_iget_locked(struct super_block *sb, 328 erofs_nid_t nid) 329 { 330 const unsigned long hashval = erofs_inode_hash(nid); 331 332 return iget5_locked(sb, hashval, erofs_ilookup_test_actor, 333 erofs_iget_set_actor, &nid); 334 } 335 336 struct inode *erofs_iget(struct super_block *sb, 337 erofs_nid_t nid, 338 bool isdir) 339 { 340 struct inode *inode = erofs_iget_locked(sb, nid); 341 342 if (!inode) 343 return ERR_PTR(-ENOMEM); 344 345 if (inode->i_state & I_NEW) { 346 int err; 347 struct erofs_inode *vi = EROFS_I(inode); 348 349 vi->nid = nid; 350 351 err = erofs_fill_inode(inode, isdir); 352 if (!err) 353 unlock_new_inode(inode); 354 else { 355 iget_failed(inode); 356 inode = ERR_PTR(err); 357 } 358 } 359 return inode; 360 } 361 362 int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 363 struct kstat *stat, u32 request_mask, 364 unsigned int query_flags) 365 { 366 struct inode *const inode = d_inode(path->dentry); 367 368 if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) 369 stat->attributes |= STATX_ATTR_COMPRESSED; 370 371 stat->attributes |= STATX_ATTR_IMMUTABLE; 372 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 373 STATX_ATTR_IMMUTABLE); 374 375 generic_fillattr(mnt_userns, inode, stat); 376 return 0; 377 } 378 379 const struct inode_operations erofs_generic_iops = { 380 .getattr = erofs_getattr, 381 .listxattr = erofs_listxattr, 382 .get_acl = erofs_get_acl, 383 .fiemap = erofs_fiemap, 384 }; 385 386 const struct inode_operations erofs_symlink_iops = { 387 .get_link = page_get_link, 388 .getattr = erofs_getattr, 389 .listxattr = erofs_listxattr, 390 .get_acl = erofs_get_acl, 391 }; 392 393 const struct inode_operations erofs_fast_symlink_iops = { 394 .get_link = simple_get_link, 395 .getattr = erofs_getattr, 396 .listxattr = erofs_listxattr, 397 .get_acl = erofs_get_acl, 398 }; 399