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 = erofs_iloc(inode); 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(sb, inode_loc); 27 *ofs = erofs_blkoff(sb, inode_loc); 28 29 kaddr = erofs_read_metabuf(buf, sb, blkaddr, EROFS_KMAP); 30 if (IS_ERR(kaddr)) { 31 erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld", 32 vi->nid, PTR_ERR(kaddr)); 33 return kaddr; 34 } 35 36 dic = kaddr + *ofs; 37 ifmt = le16_to_cpu(dic->i_format); 38 39 if (ifmt & ~EROFS_I_ALL) { 40 erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu", 41 ifmt, vi->nid); 42 err = -EOPNOTSUPP; 43 goto err_out; 44 } 45 46 vi->datalayout = erofs_inode_datalayout(ifmt); 47 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 48 erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu", 49 vi->datalayout, vi->nid); 50 err = -EOPNOTSUPP; 51 goto err_out; 52 } 53 54 switch (erofs_inode_version(ifmt)) { 55 case EROFS_INODE_LAYOUT_EXTENDED: 56 vi->inode_isize = sizeof(struct erofs_inode_extended); 57 /* check if the extended inode acrosses block boundary */ 58 if (*ofs + vi->inode_isize <= sb->s_blocksize) { 59 *ofs += vi->inode_isize; 60 die = (struct erofs_inode_extended *)dic; 61 } else { 62 const unsigned int gotten = sb->s_blocksize - *ofs; 63 64 copied = kmalloc(vi->inode_isize, GFP_NOFS); 65 if (!copied) { 66 err = -ENOMEM; 67 goto err_out; 68 } 69 memcpy(copied, dic, gotten); 70 kaddr = erofs_read_metabuf(buf, sb, blkaddr + 1, 71 EROFS_KMAP); 72 if (IS_ERR(kaddr)) { 73 erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld", 74 vi->nid, PTR_ERR(kaddr)); 75 kfree(copied); 76 return kaddr; 77 } 78 *ofs = vi->inode_isize - gotten; 79 memcpy((u8 *)copied + gotten, kaddr, *ofs); 80 die = copied; 81 } 82 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 83 84 inode->i_mode = le16_to_cpu(die->i_mode); 85 switch (inode->i_mode & S_IFMT) { 86 case S_IFREG: 87 case S_IFDIR: 88 case S_IFLNK: 89 vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr); 90 break; 91 case S_IFCHR: 92 case S_IFBLK: 93 inode->i_rdev = 94 new_decode_dev(le32_to_cpu(die->i_u.rdev)); 95 break; 96 case S_IFIFO: 97 case S_IFSOCK: 98 inode->i_rdev = 0; 99 break; 100 default: 101 goto bogusimode; 102 } 103 i_uid_write(inode, le32_to_cpu(die->i_uid)); 104 i_gid_write(inode, le32_to_cpu(die->i_gid)); 105 set_nlink(inode, le32_to_cpu(die->i_nlink)); 106 107 /* extended inode has its own timestamp */ 108 inode_set_ctime(inode, le64_to_cpu(die->i_mtime), 109 le32_to_cpu(die->i_mtime_nsec)); 110 111 inode->i_size = le64_to_cpu(die->i_size); 112 113 /* total blocks for compressed files */ 114 if (erofs_inode_is_data_compressed(vi->datalayout)) 115 nblks = le32_to_cpu(die->i_u.compressed_blocks); 116 else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) 117 /* fill chunked inode summary info */ 118 vi->chunkformat = le16_to_cpu(die->i_u.c.format); 119 kfree(copied); 120 copied = NULL; 121 break; 122 case EROFS_INODE_LAYOUT_COMPACT: 123 vi->inode_isize = sizeof(struct erofs_inode_compact); 124 *ofs += vi->inode_isize; 125 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 126 127 inode->i_mode = le16_to_cpu(dic->i_mode); 128 switch (inode->i_mode & S_IFMT) { 129 case S_IFREG: 130 case S_IFDIR: 131 case S_IFLNK: 132 vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr); 133 break; 134 case S_IFCHR: 135 case S_IFBLK: 136 inode->i_rdev = 137 new_decode_dev(le32_to_cpu(dic->i_u.rdev)); 138 break; 139 case S_IFIFO: 140 case S_IFSOCK: 141 inode->i_rdev = 0; 142 break; 143 default: 144 goto bogusimode; 145 } 146 i_uid_write(inode, le16_to_cpu(dic->i_uid)); 147 i_gid_write(inode, le16_to_cpu(dic->i_gid)); 148 set_nlink(inode, le16_to_cpu(dic->i_nlink)); 149 150 /* use build time for compact inodes */ 151 inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec); 152 153 inode->i_size = le32_to_cpu(dic->i_size); 154 if (erofs_inode_is_data_compressed(vi->datalayout)) 155 nblks = le32_to_cpu(dic->i_u.compressed_blocks); 156 else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) 157 vi->chunkformat = le16_to_cpu(dic->i_u.c.format); 158 break; 159 default: 160 erofs_err(inode->i_sb, 161 "unsupported on-disk inode version %u of nid %llu", 162 erofs_inode_version(ifmt), vi->nid); 163 err = -EOPNOTSUPP; 164 goto err_out; 165 } 166 167 if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { 168 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) { 169 erofs_err(inode->i_sb, 170 "unsupported chunk format %x of nid %llu", 171 vi->chunkformat, vi->nid); 172 err = -EOPNOTSUPP; 173 goto err_out; 174 } 175 vi->chunkbits = sb->s_blocksize_bits + 176 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK); 177 } 178 inode_set_mtime_to_ts(inode, 179 inode_set_atime_to_ts(inode, inode_get_ctime(inode))); 180 181 inode->i_flags &= ~S_DAX; 182 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && 183 (vi->datalayout == EROFS_INODE_FLAT_PLAIN || 184 vi->datalayout == EROFS_INODE_CHUNK_BASED)) 185 inode->i_flags |= S_DAX; 186 187 if (!nblks) 188 /* measure inode.i_blocks as generic filesystems */ 189 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9; 190 else 191 inode->i_blocks = nblks << (sb->s_blocksize_bits - 9); 192 return kaddr; 193 194 bogusimode: 195 erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu", 196 inode->i_mode, vi->nid); 197 err = -EFSCORRUPTED; 198 err_out: 199 DBG_BUGON(1); 200 kfree(copied); 201 erofs_put_metabuf(buf); 202 return ERR_PTR(err); 203 } 204 205 static int erofs_fill_symlink(struct inode *inode, void *kaddr, 206 unsigned int m_pofs) 207 { 208 struct erofs_inode *vi = EROFS_I(inode); 209 unsigned int bsz = i_blocksize(inode); 210 char *lnk; 211 212 /* if it cannot be handled with fast symlink scheme */ 213 if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 214 inode->i_size >= bsz || inode->i_size < 0) { 215 inode->i_op = &erofs_symlink_iops; 216 return 0; 217 } 218 219 lnk = kmalloc(inode->i_size + 1, GFP_KERNEL); 220 if (!lnk) 221 return -ENOMEM; 222 223 m_pofs += vi->xattr_isize; 224 /* inline symlink data shouldn't cross block boundary */ 225 if (m_pofs + inode->i_size > bsz) { 226 kfree(lnk); 227 erofs_err(inode->i_sb, 228 "inline data cross block boundary @ nid %llu", 229 vi->nid); 230 DBG_BUGON(1); 231 return -EFSCORRUPTED; 232 } 233 memcpy(lnk, kaddr + m_pofs, inode->i_size); 234 lnk[inode->i_size] = '\0'; 235 236 inode->i_link = lnk; 237 inode->i_op = &erofs_fast_symlink_iops; 238 return 0; 239 } 240 241 static int erofs_fill_inode(struct inode *inode) 242 { 243 struct erofs_inode *vi = EROFS_I(inode); 244 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 245 void *kaddr; 246 unsigned int ofs; 247 int err = 0; 248 249 trace_erofs_fill_inode(inode); 250 251 /* read inode base data from disk */ 252 kaddr = erofs_read_inode(&buf, inode, &ofs); 253 if (IS_ERR(kaddr)) 254 return PTR_ERR(kaddr); 255 256 /* setup the new inode */ 257 switch (inode->i_mode & S_IFMT) { 258 case S_IFREG: 259 inode->i_op = &erofs_generic_iops; 260 if (erofs_inode_is_data_compressed(vi->datalayout)) 261 inode->i_fop = &generic_ro_fops; 262 else 263 inode->i_fop = &erofs_file_fops; 264 break; 265 case S_IFDIR: 266 inode->i_op = &erofs_dir_iops; 267 inode->i_fop = &erofs_dir_fops; 268 inode_nohighmem(inode); 269 break; 270 case S_IFLNK: 271 err = erofs_fill_symlink(inode, kaddr, ofs); 272 if (err) 273 goto out_unlock; 274 inode_nohighmem(inode); 275 break; 276 case S_IFCHR: 277 case S_IFBLK: 278 case S_IFIFO: 279 case S_IFSOCK: 280 inode->i_op = &erofs_generic_iops; 281 init_special_inode(inode, inode->i_mode, inode->i_rdev); 282 goto out_unlock; 283 default: 284 err = -EFSCORRUPTED; 285 goto out_unlock; 286 } 287 288 if (erofs_inode_is_data_compressed(vi->datalayout)) { 289 #ifdef CONFIG_EROFS_FS_ZIP 290 if (!erofs_is_fscache_mode(inode->i_sb) && 291 inode->i_sb->s_blocksize_bits == PAGE_SHIFT) { 292 inode->i_mapping->a_ops = &z_erofs_aops; 293 err = 0; 294 goto out_unlock; 295 } 296 #endif 297 err = -EOPNOTSUPP; 298 goto out_unlock; 299 } 300 inode->i_mapping->a_ops = &erofs_raw_access_aops; 301 mapping_set_large_folios(inode->i_mapping); 302 #ifdef CONFIG_EROFS_FS_ONDEMAND 303 if (erofs_is_fscache_mode(inode->i_sb)) 304 inode->i_mapping->a_ops = &erofs_fscache_access_aops; 305 #endif 306 307 out_unlock: 308 erofs_put_metabuf(&buf); 309 return err; 310 } 311 312 /* 313 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 314 * so that it will fit. 315 */ 316 static ino_t erofs_squash_ino(erofs_nid_t nid) 317 { 318 ino_t ino = (ino_t)nid; 319 320 if (sizeof(ino_t) < sizeof(erofs_nid_t)) 321 ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8; 322 return ino; 323 } 324 325 static int erofs_iget5_eq(struct inode *inode, void *opaque) 326 { 327 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque; 328 } 329 330 static int erofs_iget5_set(struct inode *inode, void *opaque) 331 { 332 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 333 334 inode->i_ino = erofs_squash_ino(nid); 335 EROFS_I(inode)->nid = nid; 336 return 0; 337 } 338 339 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid) 340 { 341 struct inode *inode; 342 343 inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq, 344 erofs_iget5_set, &nid); 345 if (!inode) 346 return ERR_PTR(-ENOMEM); 347 348 if (inode->i_state & I_NEW) { 349 int err = erofs_fill_inode(inode); 350 351 if (err) { 352 iget_failed(inode); 353 return ERR_PTR(err); 354 } 355 unlock_new_inode(inode); 356 } 357 return inode; 358 } 359 360 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 361 struct kstat *stat, u32 request_mask, 362 unsigned int query_flags) 363 { 364 struct inode *const inode = d_inode(path->dentry); 365 366 if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) 367 stat->attributes |= STATX_ATTR_COMPRESSED; 368 369 stat->attributes |= STATX_ATTR_IMMUTABLE; 370 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 371 STATX_ATTR_IMMUTABLE); 372 373 generic_fillattr(idmap, request_mask, inode, stat); 374 return 0; 375 } 376 377 const struct inode_operations erofs_generic_iops = { 378 .getattr = erofs_getattr, 379 .listxattr = erofs_listxattr, 380 .get_inode_acl = erofs_get_acl, 381 .fiemap = erofs_fiemap, 382 }; 383 384 const struct inode_operations erofs_symlink_iops = { 385 .get_link = page_get_link, 386 .getattr = erofs_getattr, 387 .listxattr = erofs_listxattr, 388 .get_inode_acl = erofs_get_acl, 389 }; 390 391 const struct inode_operations erofs_fast_symlink_iops = { 392 .get_link = simple_get_link, 393 .getattr = erofs_getattr, 394 .listxattr = erofs_listxattr, 395 .get_inode_acl = erofs_get_acl, 396 }; 397