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->i_mtime = inode->i_atime = inode_get_ctime(inode); 179 180 inode->i_flags &= ~S_DAX; 181 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && 182 (vi->datalayout == EROFS_INODE_FLAT_PLAIN || 183 vi->datalayout == EROFS_INODE_CHUNK_BASED)) 184 inode->i_flags |= S_DAX; 185 186 if (!nblks) 187 /* measure inode.i_blocks as generic filesystems */ 188 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9; 189 else 190 inode->i_blocks = nblks << (sb->s_blocksize_bits - 9); 191 return kaddr; 192 193 bogusimode: 194 erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu", 195 inode->i_mode, vi->nid); 196 err = -EFSCORRUPTED; 197 err_out: 198 DBG_BUGON(1); 199 kfree(copied); 200 erofs_put_metabuf(buf); 201 return ERR_PTR(err); 202 } 203 204 static int erofs_fill_symlink(struct inode *inode, void *kaddr, 205 unsigned int m_pofs) 206 { 207 struct erofs_inode *vi = EROFS_I(inode); 208 unsigned int bsz = i_blocksize(inode); 209 char *lnk; 210 211 /* if it cannot be handled with fast symlink scheme */ 212 if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 213 inode->i_size >= bsz || inode->i_size < 0) { 214 inode->i_op = &erofs_symlink_iops; 215 return 0; 216 } 217 218 lnk = kmalloc(inode->i_size + 1, GFP_KERNEL); 219 if (!lnk) 220 return -ENOMEM; 221 222 m_pofs += vi->xattr_isize; 223 /* inline symlink data shouldn't cross block boundary */ 224 if (m_pofs + inode->i_size > bsz) { 225 kfree(lnk); 226 erofs_err(inode->i_sb, 227 "inline data cross block boundary @ nid %llu", 228 vi->nid); 229 DBG_BUGON(1); 230 return -EFSCORRUPTED; 231 } 232 memcpy(lnk, kaddr + m_pofs, inode->i_size); 233 lnk[inode->i_size] = '\0'; 234 235 inode->i_link = lnk; 236 inode->i_op = &erofs_fast_symlink_iops; 237 return 0; 238 } 239 240 static int erofs_fill_inode(struct inode *inode) 241 { 242 struct erofs_inode *vi = EROFS_I(inode); 243 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 244 void *kaddr; 245 unsigned int ofs; 246 int err = 0; 247 248 trace_erofs_fill_inode(inode); 249 250 /* read inode base data from disk */ 251 kaddr = erofs_read_inode(&buf, inode, &ofs); 252 if (IS_ERR(kaddr)) 253 return PTR_ERR(kaddr); 254 255 /* setup the new inode */ 256 switch (inode->i_mode & S_IFMT) { 257 case S_IFREG: 258 inode->i_op = &erofs_generic_iops; 259 if (erofs_inode_is_data_compressed(vi->datalayout)) 260 inode->i_fop = &generic_ro_fops; 261 else 262 inode->i_fop = &erofs_file_fops; 263 break; 264 case S_IFDIR: 265 inode->i_op = &erofs_dir_iops; 266 inode->i_fop = &erofs_dir_fops; 267 inode_nohighmem(inode); 268 break; 269 case S_IFLNK: 270 err = erofs_fill_symlink(inode, kaddr, ofs); 271 if (err) 272 goto out_unlock; 273 inode_nohighmem(inode); 274 break; 275 case S_IFCHR: 276 case S_IFBLK: 277 case S_IFIFO: 278 case S_IFSOCK: 279 inode->i_op = &erofs_generic_iops; 280 init_special_inode(inode, inode->i_mode, inode->i_rdev); 281 goto out_unlock; 282 default: 283 err = -EFSCORRUPTED; 284 goto out_unlock; 285 } 286 287 if (erofs_inode_is_data_compressed(vi->datalayout)) { 288 #ifdef CONFIG_EROFS_FS_ZIP 289 if (!erofs_is_fscache_mode(inode->i_sb) && 290 inode->i_sb->s_blocksize_bits == PAGE_SHIFT) { 291 inode->i_mapping->a_ops = &z_erofs_aops; 292 err = 0; 293 goto out_unlock; 294 } 295 #endif 296 err = -EOPNOTSUPP; 297 goto out_unlock; 298 } 299 inode->i_mapping->a_ops = &erofs_raw_access_aops; 300 mapping_set_large_folios(inode->i_mapping); 301 #ifdef CONFIG_EROFS_FS_ONDEMAND 302 if (erofs_is_fscache_mode(inode->i_sb)) 303 inode->i_mapping->a_ops = &erofs_fscache_access_aops; 304 #endif 305 306 out_unlock: 307 erofs_put_metabuf(&buf); 308 return err; 309 } 310 311 /* 312 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 313 * so that it will fit. 314 */ 315 static ino_t erofs_squash_ino(erofs_nid_t nid) 316 { 317 ino_t ino = (ino_t)nid; 318 319 if (sizeof(ino_t) < sizeof(erofs_nid_t)) 320 ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8; 321 return ino; 322 } 323 324 static int erofs_iget5_eq(struct inode *inode, void *opaque) 325 { 326 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque; 327 } 328 329 static int erofs_iget5_set(struct inode *inode, void *opaque) 330 { 331 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 332 333 inode->i_ino = erofs_squash_ino(nid); 334 EROFS_I(inode)->nid = nid; 335 return 0; 336 } 337 338 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid) 339 { 340 struct inode *inode; 341 342 inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq, 343 erofs_iget5_set, &nid); 344 if (!inode) 345 return ERR_PTR(-ENOMEM); 346 347 if (inode->i_state & I_NEW) { 348 int err = erofs_fill_inode(inode); 349 350 if (err) { 351 iget_failed(inode); 352 return ERR_PTR(err); 353 } 354 unlock_new_inode(inode); 355 } 356 return inode; 357 } 358 359 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 360 struct kstat *stat, u32 request_mask, 361 unsigned int query_flags) 362 { 363 struct inode *const inode = d_inode(path->dentry); 364 365 if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) 366 stat->attributes |= STATX_ATTR_COMPRESSED; 367 368 stat->attributes |= STATX_ATTR_IMMUTABLE; 369 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 370 STATX_ATTR_IMMUTABLE); 371 372 generic_fillattr(idmap, request_mask, inode, stat); 373 return 0; 374 } 375 376 const struct inode_operations erofs_generic_iops = { 377 .getattr = erofs_getattr, 378 .listxattr = erofs_listxattr, 379 .get_inode_acl = erofs_get_acl, 380 .fiemap = erofs_fiemap, 381 }; 382 383 const struct inode_operations erofs_symlink_iops = { 384 .get_link = page_get_link, 385 .getattr = erofs_getattr, 386 .listxattr = erofs_listxattr, 387 .get_inode_acl = erofs_get_acl, 388 }; 389 390 const struct inode_operations erofs_fast_symlink_iops = { 391 .get_link = simple_get_link, 392 .getattr = erofs_getattr, 393 .listxattr = erofs_listxattr, 394 .get_inode_acl = erofs_get_acl, 395 }; 396