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 bool in_mbox = erofs_inode_in_metabox(inode); 33 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 34 struct erofs_sb_info *sbi = EROFS_SB(sb); 35 erofs_blk_t addrmask = BIT_ULL(48) - 1; 36 struct erofs_inode *vi = EROFS_I(inode); 37 struct erofs_inode_extended *die, copied; 38 struct erofs_inode_compact *dic; 39 unsigned int ifmt; 40 void *ptr; 41 int err = 0; 42 43 ptr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), in_mbox); 44 if (IS_ERR(ptr)) { 45 err = PTR_ERR(ptr); 46 erofs_err(sb, "failed to read inode meta block (nid: %llu): %d", 47 vi->nid, err); 48 goto err_out; 49 } 50 51 dic = ptr + ofs; 52 ifmt = le16_to_cpu(dic->i_format); 53 if (ifmt & ~EROFS_I_ALL) { 54 erofs_err(sb, "unsupported i_format %u of nid %llu", 55 ifmt, vi->nid); 56 err = -EOPNOTSUPP; 57 goto err_out; 58 } 59 60 vi->datalayout = erofs_inode_datalayout(ifmt); 61 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 62 erofs_err(sb, "unsupported datalayout %u of nid %llu", 63 vi->datalayout, vi->nid); 64 err = -EOPNOTSUPP; 65 goto err_out; 66 } 67 68 switch (erofs_inode_version(ifmt)) { 69 case EROFS_INODE_LAYOUT_EXTENDED: 70 vi->inode_isize = sizeof(struct erofs_inode_extended); 71 /* check if the extended inode acrosses block boundary */ 72 if (ofs + vi->inode_isize <= sb->s_blocksize) { 73 ofs += vi->inode_isize; 74 die = (struct erofs_inode_extended *)dic; 75 copied.i_u = die->i_u; 76 copied.i_nb = die->i_nb; 77 } else { 78 const unsigned int gotten = sb->s_blocksize - ofs; 79 80 memcpy(&copied, dic, gotten); 81 ptr = erofs_read_metabuf(&buf, sb, 82 erofs_pos(sb, blkaddr + 1), in_mbox); 83 if (IS_ERR(ptr)) { 84 err = PTR_ERR(ptr); 85 erofs_err(sb, "failed to read inode payload block (nid: %llu): %d", 86 vi->nid, err); 87 goto err_out; 88 } 89 ofs = vi->inode_isize - gotten; 90 memcpy((u8 *)&copied + gotten, ptr, ofs); 91 die = &copied; 92 } 93 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 94 95 inode->i_mode = le16_to_cpu(die->i_mode); 96 i_uid_write(inode, le32_to_cpu(die->i_uid)); 97 i_gid_write(inode, le32_to_cpu(die->i_gid)); 98 set_nlink(inode, le32_to_cpu(die->i_nlink)); 99 inode_set_mtime(inode, le64_to_cpu(die->i_mtime), 100 le32_to_cpu(die->i_mtime_nsec)); 101 102 inode->i_size = le64_to_cpu(die->i_size); 103 break; 104 case EROFS_INODE_LAYOUT_COMPACT: 105 vi->inode_isize = sizeof(struct erofs_inode_compact); 106 ofs += vi->inode_isize; 107 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 108 109 inode->i_mode = le16_to_cpu(dic->i_mode); 110 copied.i_u = dic->i_u; 111 i_uid_write(inode, le16_to_cpu(dic->i_uid)); 112 i_gid_write(inode, le16_to_cpu(dic->i_gid)); 113 if (!S_ISDIR(inode->i_mode) && 114 ((ifmt >> EROFS_I_NLINK_1_BIT) & 1)) { 115 set_nlink(inode, 1); 116 copied.i_nb = dic->i_nb; 117 } else { 118 set_nlink(inode, le16_to_cpu(dic->i_nb.nlink)); 119 copied.i_nb.startblk_hi = 0; 120 addrmask = BIT_ULL(32) - 1; 121 } 122 inode_set_mtime(inode, sbi->epoch + le32_to_cpu(dic->i_mtime), 123 sbi->fixed_nsec); 124 125 inode->i_size = le32_to_cpu(dic->i_size); 126 break; 127 default: 128 erofs_err(sb, "unsupported on-disk inode version %u of nid %llu", 129 erofs_inode_version(ifmt), vi->nid); 130 err = -EOPNOTSUPP; 131 goto err_out; 132 } 133 134 if (unlikely(inode->i_size < 0)) { 135 erofs_err(sb, "negative i_size @ nid %llu", vi->nid); 136 err = -EFSCORRUPTED; 137 goto err_out; 138 } 139 switch (inode->i_mode & S_IFMT) { 140 case S_IFDIR: 141 vi->dot_omitted = (ifmt >> EROFS_I_DOT_OMITTED_BIT) & 1; 142 fallthrough; 143 case S_IFREG: 144 case S_IFLNK: 145 vi->startblk = le32_to_cpu(copied.i_u.startblk_lo) | 146 ((u64)le16_to_cpu(copied.i_nb.startblk_hi) << 32); 147 if (vi->datalayout == EROFS_INODE_FLAT_PLAIN && 148 !((vi->startblk ^ EROFS_NULL_ADDR) & addrmask)) 149 vi->startblk = EROFS_NULL_ADDR; 150 151 if(S_ISLNK(inode->i_mode)) { 152 err = erofs_fill_symlink(inode, ptr, ofs); 153 if (err) 154 goto err_out; 155 } 156 break; 157 case S_IFCHR: 158 case S_IFBLK: 159 inode->i_rdev = new_decode_dev(le32_to_cpu(copied.i_u.rdev)); 160 break; 161 case S_IFIFO: 162 case S_IFSOCK: 163 inode->i_rdev = 0; 164 break; 165 default: 166 erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode, 167 vi->nid); 168 err = -EFSCORRUPTED; 169 goto err_out; 170 } 171 172 if (erofs_inode_is_data_compressed(vi->datalayout)) 173 inode->i_blocks = le32_to_cpu(copied.i_u.blocks_lo) << 174 (sb->s_blocksize_bits - 9); 175 else 176 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9; 177 178 if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { 179 /* fill chunked inode summary info */ 180 vi->chunkformat = le16_to_cpu(copied.i_u.c.format); 181 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) { 182 erofs_err(sb, "unsupported chunk format %x of nid %llu", 183 vi->chunkformat, vi->nid); 184 err = -EOPNOTSUPP; 185 goto err_out; 186 } 187 vi->chunkbits = sb->s_blocksize_bits + 188 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK); 189 } 190 inode_set_atime_to_ts(inode, 191 inode_set_ctime_to_ts(inode, inode_get_mtime(inode))); 192 193 inode->i_flags &= ~S_DAX; 194 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && 195 (vi->datalayout == EROFS_INODE_FLAT_PLAIN || 196 vi->datalayout == EROFS_INODE_CHUNK_BASED)) 197 inode->i_flags |= S_DAX; 198 err_out: 199 erofs_put_metabuf(&buf); 200 return err; 201 } 202 203 static int erofs_fill_inode(struct inode *inode) 204 { 205 struct erofs_inode *vi = EROFS_I(inode); 206 int err; 207 208 trace_erofs_fill_inode(inode); 209 err = erofs_read_inode(inode); 210 if (err) 211 return err; 212 213 switch (inode->i_mode & S_IFMT) { 214 case S_IFREG: 215 inode->i_op = &erofs_generic_iops; 216 if (erofs_inode_is_data_compressed(vi->datalayout)) 217 inode->i_fop = &generic_ro_fops; 218 else 219 inode->i_fop = &erofs_file_fops; 220 break; 221 case S_IFDIR: 222 inode->i_op = &erofs_dir_iops; 223 inode->i_fop = &erofs_dir_fops; 224 inode_nohighmem(inode); 225 break; 226 case S_IFLNK: 227 if (inode->i_link) 228 inode->i_op = &erofs_fast_symlink_iops; 229 else 230 inode->i_op = &erofs_symlink_iops; 231 inode_nohighmem(inode); 232 break; 233 default: 234 inode->i_op = &erofs_generic_iops; 235 init_special_inode(inode, inode->i_mode, inode->i_rdev); 236 return 0; 237 } 238 239 mapping_set_large_folios(inode->i_mapping); 240 if (erofs_inode_is_data_compressed(vi->datalayout)) { 241 #ifdef CONFIG_EROFS_FS_ZIP 242 DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT, 243 erofs_info, inode->i_sb, 244 "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!"); 245 inode->i_mapping->a_ops = &z_erofs_aops; 246 #else 247 err = -EOPNOTSUPP; 248 #endif 249 } else { 250 inode->i_mapping->a_ops = &erofs_aops; 251 #ifdef CONFIG_EROFS_FS_ONDEMAND 252 if (erofs_is_fscache_mode(inode->i_sb)) 253 inode->i_mapping->a_ops = &erofs_fscache_access_aops; 254 #endif 255 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE 256 if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb))) 257 inode->i_mapping->a_ops = &erofs_fileio_aops; 258 #endif 259 } 260 261 return err; 262 } 263 264 /* 265 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 266 * so that it will fit. 267 */ 268 static ino_t erofs_squash_ino(struct super_block *sb, erofs_nid_t nid) 269 { 270 u64 ino64 = erofs_nid_to_ino64(EROFS_SB(sb), nid); 271 272 if (sizeof(ino_t) < sizeof(erofs_nid_t)) 273 ino64 ^= ino64 >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8; 274 return (ino_t)ino64; 275 } 276 277 static int erofs_iget5_eq(struct inode *inode, void *opaque) 278 { 279 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque; 280 } 281 282 static int erofs_iget5_set(struct inode *inode, void *opaque) 283 { 284 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 285 286 inode->i_ino = erofs_squash_ino(inode->i_sb, nid); 287 EROFS_I(inode)->nid = nid; 288 return 0; 289 } 290 291 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid) 292 { 293 struct inode *inode; 294 295 inode = iget5_locked(sb, erofs_squash_ino(sb, nid), erofs_iget5_eq, 296 erofs_iget5_set, &nid); 297 if (!inode) 298 return ERR_PTR(-ENOMEM); 299 300 if (inode->i_state & I_NEW) { 301 int err = erofs_fill_inode(inode); 302 303 if (err) { 304 iget_failed(inode); 305 return ERR_PTR(err); 306 } 307 unlock_new_inode(inode); 308 } 309 return inode; 310 } 311 312 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 313 struct kstat *stat, u32 request_mask, 314 unsigned int query_flags) 315 { 316 struct inode *const inode = d_inode(path->dentry); 317 struct block_device *bdev = inode->i_sb->s_bdev; 318 bool compressed = 319 erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout); 320 321 if (compressed) 322 stat->attributes |= STATX_ATTR_COMPRESSED; 323 stat->attributes |= STATX_ATTR_IMMUTABLE; 324 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 325 STATX_ATTR_IMMUTABLE); 326 327 /* 328 * Return the DIO alignment restrictions if requested. 329 * 330 * In EROFS, STATX_DIOALIGN is only supported in bdev-based mode 331 * and uncompressed inodes, otherwise we report no DIO support. 332 */ 333 if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) { 334 stat->result_mask |= STATX_DIOALIGN; 335 if (bdev && !compressed) { 336 stat->dio_mem_align = bdev_dma_alignment(bdev) + 1; 337 stat->dio_offset_align = bdev_logical_block_size(bdev); 338 } 339 } 340 generic_fillattr(idmap, request_mask, inode, stat); 341 return 0; 342 } 343 344 const struct inode_operations erofs_generic_iops = { 345 .getattr = erofs_getattr, 346 .listxattr = erofs_listxattr, 347 .get_inode_acl = erofs_get_acl, 348 .fiemap = erofs_fiemap, 349 }; 350 351 const struct inode_operations erofs_symlink_iops = { 352 .get_link = page_get_link, 353 .getattr = erofs_getattr, 354 .listxattr = erofs_listxattr, 355 .get_inode_acl = erofs_get_acl, 356 }; 357 358 const struct inode_operations erofs_fast_symlink_iops = { 359 .get_link = simple_get_link, 360 .getattr = erofs_getattr, 361 .listxattr = erofs_listxattr, 362 .get_inode_acl = erofs_get_acl, 363 }; 364