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 #include <trace/events/erofs.h> 9 10 static int erofs_fill_symlink(struct inode *inode, void *kaddr, 11 unsigned int m_pofs) 12 { 13 struct erofs_inode *vi = EROFS_I(inode); 14 loff_t off; 15 16 m_pofs += vi->xattr_isize; 17 /* check if it cannot be handled with fast symlink scheme */ 18 if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 19 check_add_overflow(m_pofs, inode->i_size, &off) || 20 off > i_blocksize(inode)) 21 return 0; 22 23 inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL); 24 return inode->i_link ? 0 : -ENOMEM; 25 } 26 27 static int erofs_read_inode(struct inode *inode) 28 { 29 struct super_block *sb = inode->i_sb; 30 erofs_blk_t blkaddr = erofs_blknr(sb, erofs_iloc(inode)); 31 unsigned int ofs = erofs_blkoff(sb, erofs_iloc(inode)); 32 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 33 struct erofs_sb_info *sbi = EROFS_SB(sb); 34 erofs_blk_t addrmask = BIT_ULL(48) - 1; 35 struct erofs_inode *vi = EROFS_I(inode); 36 struct erofs_inode_extended *die, copied; 37 struct erofs_inode_compact *dic; 38 unsigned int ifmt; 39 void *ptr; 40 int err = 0; 41 42 ptr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), true); 43 if (IS_ERR(ptr)) { 44 err = PTR_ERR(ptr); 45 erofs_err(sb, "failed to get inode (nid: %llu) page, err %d", 46 vi->nid, err); 47 goto err_out; 48 } 49 50 dic = ptr + ofs; 51 ifmt = le16_to_cpu(dic->i_format); 52 if (ifmt & ~EROFS_I_ALL) { 53 erofs_err(sb, "unsupported i_format %u of nid %llu", 54 ifmt, vi->nid); 55 err = -EOPNOTSUPP; 56 goto err_out; 57 } 58 59 vi->datalayout = erofs_inode_datalayout(ifmt); 60 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 61 erofs_err(sb, "unsupported datalayout %u of nid %llu", 62 vi->datalayout, vi->nid); 63 err = -EOPNOTSUPP; 64 goto err_out; 65 } 66 67 switch (erofs_inode_version(ifmt)) { 68 case EROFS_INODE_LAYOUT_EXTENDED: 69 vi->inode_isize = sizeof(struct erofs_inode_extended); 70 /* check if the extended inode acrosses block boundary */ 71 if (ofs + vi->inode_isize <= sb->s_blocksize) { 72 ofs += vi->inode_isize; 73 die = (struct erofs_inode_extended *)dic; 74 copied.i_u = die->i_u; 75 copied.i_nb = die->i_nb; 76 } else { 77 const unsigned int gotten = sb->s_blocksize - ofs; 78 79 memcpy(&copied, dic, gotten); 80 ptr = erofs_read_metabuf(&buf, sb, 81 erofs_pos(sb, blkaddr + 1), true); 82 if (IS_ERR(ptr)) { 83 err = PTR_ERR(ptr); 84 erofs_err(sb, "failed to get inode payload block (nid: %llu), err %d", 85 vi->nid, err); 86 goto err_out; 87 } 88 ofs = vi->inode_isize - gotten; 89 memcpy((u8 *)&copied + gotten, ptr, ofs); 90 die = &copied; 91 } 92 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 93 94 inode->i_mode = le16_to_cpu(die->i_mode); 95 i_uid_write(inode, le32_to_cpu(die->i_uid)); 96 i_gid_write(inode, le32_to_cpu(die->i_gid)); 97 set_nlink(inode, le32_to_cpu(die->i_nlink)); 98 inode_set_mtime(inode, le64_to_cpu(die->i_mtime), 99 le32_to_cpu(die->i_mtime_nsec)); 100 101 inode->i_size = le64_to_cpu(die->i_size); 102 break; 103 case EROFS_INODE_LAYOUT_COMPACT: 104 vi->inode_isize = sizeof(struct erofs_inode_compact); 105 ofs += vi->inode_isize; 106 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 107 108 inode->i_mode = le16_to_cpu(dic->i_mode); 109 copied.i_u = dic->i_u; 110 i_uid_write(inode, le16_to_cpu(dic->i_uid)); 111 i_gid_write(inode, le16_to_cpu(dic->i_gid)); 112 if (!S_ISDIR(inode->i_mode) && 113 ((ifmt >> EROFS_I_NLINK_1_BIT) & 1)) { 114 set_nlink(inode, 1); 115 copied.i_nb = dic->i_nb; 116 } else { 117 set_nlink(inode, le16_to_cpu(dic->i_nb.nlink)); 118 copied.i_nb.startblk_hi = 0; 119 addrmask = BIT_ULL(32) - 1; 120 } 121 inode_set_mtime(inode, sbi->epoch + le32_to_cpu(dic->i_mtime), 122 sbi->fixed_nsec); 123 124 inode->i_size = le32_to_cpu(dic->i_size); 125 break; 126 default: 127 erofs_err(sb, "unsupported on-disk inode version %u of nid %llu", 128 erofs_inode_version(ifmt), vi->nid); 129 err = -EOPNOTSUPP; 130 goto err_out; 131 } 132 133 if (unlikely(inode->i_size < 0)) { 134 erofs_err(sb, "negative i_size @ nid %llu", vi->nid); 135 err = -EFSCORRUPTED; 136 goto err_out; 137 } 138 switch (inode->i_mode & S_IFMT) { 139 case S_IFDIR: 140 vi->dot_omitted = (ifmt >> EROFS_I_DOT_OMITTED_BIT) & 1; 141 fallthrough; 142 case S_IFREG: 143 case S_IFLNK: 144 vi->startblk = le32_to_cpu(copied.i_u.startblk_lo) | 145 ((u64)le16_to_cpu(copied.i_nb.startblk_hi) << 32); 146 if (vi->datalayout == EROFS_INODE_FLAT_PLAIN && 147 !((vi->startblk ^ EROFS_NULL_ADDR) & addrmask)) 148 vi->startblk = EROFS_NULL_ADDR; 149 150 if(S_ISLNK(inode->i_mode)) { 151 err = erofs_fill_symlink(inode, ptr, ofs); 152 if (err) 153 goto err_out; 154 } 155 break; 156 case S_IFCHR: 157 case S_IFBLK: 158 inode->i_rdev = new_decode_dev(le32_to_cpu(copied.i_u.rdev)); 159 break; 160 case S_IFIFO: 161 case S_IFSOCK: 162 inode->i_rdev = 0; 163 break; 164 default: 165 erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode, 166 vi->nid); 167 err = -EFSCORRUPTED; 168 goto err_out; 169 } 170 171 if (erofs_inode_is_data_compressed(vi->datalayout)) 172 inode->i_blocks = le32_to_cpu(copied.i_u.blocks_lo) << 173 (sb->s_blocksize_bits - 9); 174 else 175 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9; 176 177 if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { 178 /* fill chunked inode summary info */ 179 vi->chunkformat = le16_to_cpu(copied.i_u.c.format); 180 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) { 181 erofs_err(sb, "unsupported chunk format %x of nid %llu", 182 vi->chunkformat, vi->nid); 183 err = -EOPNOTSUPP; 184 goto err_out; 185 } 186 vi->chunkbits = sb->s_blocksize_bits + 187 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK); 188 } 189 inode_set_atime_to_ts(inode, 190 inode_set_ctime_to_ts(inode, inode_get_mtime(inode))); 191 192 inode->i_flags &= ~S_DAX; 193 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && 194 (vi->datalayout == EROFS_INODE_FLAT_PLAIN || 195 vi->datalayout == EROFS_INODE_CHUNK_BASED)) 196 inode->i_flags |= S_DAX; 197 err_out: 198 erofs_put_metabuf(&buf); 199 return err; 200 } 201 202 static int erofs_fill_inode(struct inode *inode) 203 { 204 struct erofs_inode *vi = EROFS_I(inode); 205 int err; 206 207 trace_erofs_fill_inode(inode); 208 err = erofs_read_inode(inode); 209 if (err) 210 return err; 211 212 switch (inode->i_mode & S_IFMT) { 213 case S_IFREG: 214 inode->i_op = &erofs_generic_iops; 215 if (erofs_inode_is_data_compressed(vi->datalayout)) 216 inode->i_fop = &generic_ro_fops; 217 else 218 inode->i_fop = &erofs_file_fops; 219 break; 220 case S_IFDIR: 221 inode->i_op = &erofs_dir_iops; 222 inode->i_fop = &erofs_dir_fops; 223 inode_nohighmem(inode); 224 break; 225 case S_IFLNK: 226 if (inode->i_link) 227 inode->i_op = &erofs_fast_symlink_iops; 228 else 229 inode->i_op = &erofs_symlink_iops; 230 inode_nohighmem(inode); 231 break; 232 default: 233 inode->i_op = &erofs_generic_iops; 234 init_special_inode(inode, inode->i_mode, inode->i_rdev); 235 return 0; 236 } 237 238 mapping_set_large_folios(inode->i_mapping); 239 if (erofs_inode_is_data_compressed(vi->datalayout)) { 240 #ifdef CONFIG_EROFS_FS_ZIP 241 DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT, 242 erofs_info, inode->i_sb, 243 "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!"); 244 inode->i_mapping->a_ops = &z_erofs_aops; 245 #else 246 err = -EOPNOTSUPP; 247 #endif 248 } else { 249 inode->i_mapping->a_ops = &erofs_aops; 250 #ifdef CONFIG_EROFS_FS_ONDEMAND 251 if (erofs_is_fscache_mode(inode->i_sb)) 252 inode->i_mapping->a_ops = &erofs_fscache_access_aops; 253 #endif 254 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE 255 if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb))) 256 inode->i_mapping->a_ops = &erofs_fileio_aops; 257 #endif 258 } 259 260 return err; 261 } 262 263 /* 264 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 265 * so that it will fit. 266 */ 267 static ino_t erofs_squash_ino(erofs_nid_t nid) 268 { 269 ino_t ino = (ino_t)nid; 270 271 if (sizeof(ino_t) < sizeof(erofs_nid_t)) 272 ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8; 273 return ino; 274 } 275 276 static int erofs_iget5_eq(struct inode *inode, void *opaque) 277 { 278 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque; 279 } 280 281 static int erofs_iget5_set(struct inode *inode, void *opaque) 282 { 283 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 284 285 inode->i_ino = erofs_squash_ino(nid); 286 EROFS_I(inode)->nid = nid; 287 return 0; 288 } 289 290 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid) 291 { 292 struct inode *inode; 293 294 inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq, 295 erofs_iget5_set, &nid); 296 if (!inode) 297 return ERR_PTR(-ENOMEM); 298 299 if (inode->i_state & I_NEW) { 300 int err = erofs_fill_inode(inode); 301 302 if (err) { 303 iget_failed(inode); 304 return ERR_PTR(err); 305 } 306 unlock_new_inode(inode); 307 } 308 return inode; 309 } 310 311 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 312 struct kstat *stat, u32 request_mask, 313 unsigned int query_flags) 314 { 315 struct inode *const inode = d_inode(path->dentry); 316 struct block_device *bdev = inode->i_sb->s_bdev; 317 bool compressed = 318 erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout); 319 320 if (compressed) 321 stat->attributes |= STATX_ATTR_COMPRESSED; 322 stat->attributes |= STATX_ATTR_IMMUTABLE; 323 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 324 STATX_ATTR_IMMUTABLE); 325 326 /* 327 * Return the DIO alignment restrictions if requested. 328 * 329 * In EROFS, STATX_DIOALIGN is only supported in bdev-based mode 330 * and uncompressed inodes, otherwise we report no DIO support. 331 */ 332 if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) { 333 stat->result_mask |= STATX_DIOALIGN; 334 if (bdev && !compressed) { 335 stat->dio_mem_align = bdev_dma_alignment(bdev) + 1; 336 stat->dio_offset_align = bdev_logical_block_size(bdev); 337 } 338 } 339 generic_fillattr(idmap, request_mask, inode, stat); 340 return 0; 341 } 342 343 const struct inode_operations erofs_generic_iops = { 344 .getattr = erofs_getattr, 345 .listxattr = erofs_listxattr, 346 .get_inode_acl = erofs_get_acl, 347 .fiemap = erofs_fiemap, 348 }; 349 350 const struct inode_operations erofs_symlink_iops = { 351 .get_link = page_get_link, 352 .getattr = erofs_getattr, 353 .listxattr = erofs_listxattr, 354 .get_inode_acl = erofs_get_acl, 355 }; 356 357 const struct inode_operations erofs_fast_symlink_iops = { 358 .get_link = simple_get_link, 359 .getattr = erofs_getattr, 360 .listxattr = erofs_listxattr, 361 .get_inode_acl = erofs_get_acl, 362 }; 363