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 <linux/compat.h> 9 #include <trace/events/erofs.h> 10 11 static int erofs_fill_symlink(struct inode *inode, void *kaddr, 12 unsigned int m_pofs) 13 { 14 struct erofs_inode *vi = EROFS_I(inode); 15 loff_t off; 16 17 m_pofs += vi->xattr_isize; 18 /* check if it cannot be handled with fast symlink scheme */ 19 if (vi->datalayout != EROFS_INODE_FLAT_INLINE || 20 check_add_overflow(m_pofs, inode->i_size, &off) || 21 off > i_blocksize(inode)) 22 return 0; 23 24 inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL); 25 return inode->i_link ? 0 : -ENOMEM; 26 } 27 28 static int erofs_read_inode(struct inode *inode) 29 { 30 struct super_block *sb = inode->i_sb; 31 erofs_blk_t blkaddr = erofs_blknr(sb, erofs_iloc(inode)); 32 unsigned int ofs = erofs_blkoff(sb, erofs_iloc(inode)); 33 bool in_mbox = erofs_inode_in_metabox(inode); 34 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 35 struct erofs_sb_info *sbi = EROFS_SB(sb); 36 erofs_blk_t addrmask = BIT_ULL(48) - 1; 37 struct erofs_inode *vi = EROFS_I(inode); 38 struct erofs_inode_extended *die, copied; 39 struct erofs_inode_compact *dic; 40 unsigned int ifmt; 41 void *ptr; 42 int err = 0; 43 44 ptr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), in_mbox); 45 if (IS_ERR(ptr)) { 46 err = PTR_ERR(ptr); 47 erofs_err(sb, "failed to read inode meta block (nid: %llu): %d", 48 vi->nid, err); 49 goto err_out; 50 } 51 52 dic = ptr + ofs; 53 ifmt = le16_to_cpu(dic->i_format); 54 if (ifmt & ~EROFS_I_ALL) { 55 erofs_err(sb, "unsupported i_format %u of nid %llu", 56 ifmt, vi->nid); 57 err = -EOPNOTSUPP; 58 goto err_out; 59 } 60 61 vi->datalayout = erofs_inode_datalayout(ifmt); 62 if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) { 63 erofs_err(sb, "unsupported datalayout %u of nid %llu", 64 vi->datalayout, vi->nid); 65 err = -EOPNOTSUPP; 66 goto err_out; 67 } 68 69 switch (erofs_inode_version(ifmt)) { 70 case EROFS_INODE_LAYOUT_EXTENDED: 71 vi->inode_isize = sizeof(struct erofs_inode_extended); 72 /* check if the extended inode acrosses block boundary */ 73 if (ofs + vi->inode_isize <= sb->s_blocksize) { 74 ofs += vi->inode_isize; 75 die = (struct erofs_inode_extended *)dic; 76 copied.i_u = die->i_u; 77 copied.i_nb = die->i_nb; 78 } else { 79 const unsigned int gotten = sb->s_blocksize - ofs; 80 81 memcpy(&copied, dic, gotten); 82 ptr = erofs_read_metabuf(&buf, sb, 83 erofs_pos(sb, blkaddr + 1), in_mbox); 84 if (IS_ERR(ptr)) { 85 err = PTR_ERR(ptr); 86 erofs_err(sb, "failed to read inode payload block (nid: %llu): %d", 87 vi->nid, err); 88 goto err_out; 89 } 90 ofs = vi->inode_isize - gotten; 91 memcpy((u8 *)&copied + gotten, ptr, ofs); 92 die = &copied; 93 } 94 vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount); 95 96 inode->i_mode = le16_to_cpu(die->i_mode); 97 i_uid_write(inode, le32_to_cpu(die->i_uid)); 98 i_gid_write(inode, le32_to_cpu(die->i_gid)); 99 set_nlink(inode, le32_to_cpu(die->i_nlink)); 100 inode_set_mtime(inode, le64_to_cpu(die->i_mtime), 101 le32_to_cpu(die->i_mtime_nsec)); 102 103 inode->i_size = le64_to_cpu(die->i_size); 104 break; 105 case EROFS_INODE_LAYOUT_COMPACT: 106 vi->inode_isize = sizeof(struct erofs_inode_compact); 107 ofs += vi->inode_isize; 108 vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount); 109 110 inode->i_mode = le16_to_cpu(dic->i_mode); 111 copied.i_u = dic->i_u; 112 i_uid_write(inode, le16_to_cpu(dic->i_uid)); 113 i_gid_write(inode, le16_to_cpu(dic->i_gid)); 114 if (!S_ISDIR(inode->i_mode) && 115 ((ifmt >> EROFS_I_NLINK_1_BIT) & 1)) { 116 set_nlink(inode, 1); 117 copied.i_nb = dic->i_nb; 118 } else { 119 set_nlink(inode, le16_to_cpu(dic->i_nb.nlink)); 120 copied.i_nb.startblk_hi = 0; 121 addrmask = BIT_ULL(32) - 1; 122 } 123 inode_set_mtime(inode, sbi->epoch + le32_to_cpu(dic->i_mtime), 124 sbi->fixed_nsec); 125 126 inode->i_size = le32_to_cpu(dic->i_size); 127 break; 128 default: 129 erofs_err(sb, "unsupported on-disk inode version %u of nid %llu", 130 erofs_inode_version(ifmt), vi->nid); 131 err = -EOPNOTSUPP; 132 goto err_out; 133 } 134 135 if (unlikely(inode->i_size < 0)) { 136 erofs_err(sb, "negative i_size @ nid %llu", vi->nid); 137 err = -EFSCORRUPTED; 138 goto err_out; 139 } 140 switch (inode->i_mode & S_IFMT) { 141 case S_IFDIR: 142 vi->dot_omitted = (ifmt >> EROFS_I_DOT_OMITTED_BIT) & 1; 143 fallthrough; 144 case S_IFREG: 145 case S_IFLNK: 146 vi->startblk = le32_to_cpu(copied.i_u.startblk_lo) | 147 ((u64)le16_to_cpu(copied.i_nb.startblk_hi) << 32); 148 if (vi->datalayout == EROFS_INODE_FLAT_PLAIN && 149 !((vi->startblk ^ EROFS_NULL_ADDR) & addrmask)) 150 vi->startblk = EROFS_NULL_ADDR; 151 152 if(S_ISLNK(inode->i_mode)) { 153 err = erofs_fill_symlink(inode, ptr, ofs); 154 if (err) 155 goto err_out; 156 } 157 break; 158 case S_IFCHR: 159 case S_IFBLK: 160 inode->i_rdev = new_decode_dev(le32_to_cpu(copied.i_u.rdev)); 161 break; 162 case S_IFIFO: 163 case S_IFSOCK: 164 inode->i_rdev = 0; 165 break; 166 default: 167 erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode, 168 vi->nid); 169 err = -EFSCORRUPTED; 170 goto err_out; 171 } 172 173 if (erofs_inode_is_data_compressed(vi->datalayout)) 174 inode->i_blocks = le32_to_cpu(copied.i_u.blocks_lo) << 175 (sb->s_blocksize_bits - 9); 176 else 177 inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9; 178 179 if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { 180 /* fill chunked inode summary info */ 181 vi->chunkformat = le16_to_cpu(copied.i_u.c.format); 182 if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) { 183 erofs_err(sb, "unsupported chunk format %x of nid %llu", 184 vi->chunkformat, vi->nid); 185 err = -EOPNOTSUPP; 186 goto err_out; 187 } 188 vi->chunkbits = sb->s_blocksize_bits + 189 (vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK); 190 } 191 inode_set_atime_to_ts(inode, 192 inode_set_ctime_to_ts(inode, inode_get_mtime(inode))); 193 194 inode->i_flags &= ~S_DAX; 195 if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) && 196 (vi->datalayout == EROFS_INODE_FLAT_PLAIN || 197 vi->datalayout == EROFS_INODE_CHUNK_BASED)) 198 inode->i_flags |= S_DAX; 199 err_out: 200 erofs_put_metabuf(&buf); 201 return err; 202 } 203 204 static int erofs_fill_inode(struct inode *inode) 205 { 206 struct erofs_inode *vi = EROFS_I(inode); 207 int err; 208 209 trace_erofs_fill_inode(inode); 210 err = erofs_read_inode(inode); 211 if (err) 212 return err; 213 214 switch (inode->i_mode & S_IFMT) { 215 case S_IFREG: 216 inode->i_op = &erofs_generic_iops; 217 inode->i_fop = &erofs_file_fops; 218 break; 219 case S_IFDIR: 220 inode->i_op = &erofs_dir_iops; 221 inode->i_fop = &erofs_dir_fops; 222 inode_nohighmem(inode); 223 break; 224 case S_IFLNK: 225 if (inode->i_link) 226 inode->i_op = &erofs_fast_symlink_iops; 227 else 228 inode->i_op = &erofs_symlink_iops; 229 inode_nohighmem(inode); 230 break; 231 default: 232 inode->i_op = &erofs_generic_iops; 233 init_special_inode(inode, inode->i_mode, inode->i_rdev); 234 return 0; 235 } 236 237 mapping_set_large_folios(inode->i_mapping); 238 if (erofs_inode_is_data_compressed(vi->datalayout)) { 239 #ifdef CONFIG_EROFS_FS_ZIP 240 DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT, 241 erofs_info, inode->i_sb, 242 "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!"); 243 inode->i_mapping->a_ops = &z_erofs_aops; 244 #else 245 err = -EOPNOTSUPP; 246 #endif 247 } else { 248 inode->i_mapping->a_ops = &erofs_aops; 249 #ifdef CONFIG_EROFS_FS_ONDEMAND 250 if (erofs_is_fscache_mode(inode->i_sb)) 251 inode->i_mapping->a_ops = &erofs_fscache_access_aops; 252 #endif 253 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE 254 if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb))) 255 inode->i_mapping->a_ops = &erofs_fileio_aops; 256 #endif 257 } 258 259 return err; 260 } 261 262 /* 263 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 264 * so that it will fit. 265 */ 266 static ino_t erofs_squash_ino(struct super_block *sb, erofs_nid_t nid) 267 { 268 u64 ino64 = erofs_nid_to_ino64(EROFS_SB(sb), nid); 269 270 if (sizeof(ino_t) < sizeof(erofs_nid_t)) 271 ino64 ^= ino64 >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8; 272 return (ino_t)ino64; 273 } 274 275 static int erofs_iget5_eq(struct inode *inode, void *opaque) 276 { 277 return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque; 278 } 279 280 static int erofs_iget5_set(struct inode *inode, void *opaque) 281 { 282 const erofs_nid_t nid = *(erofs_nid_t *)opaque; 283 284 inode->i_ino = erofs_squash_ino(inode->i_sb, nid); 285 EROFS_I(inode)->nid = nid; 286 return 0; 287 } 288 289 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid) 290 { 291 struct inode *inode; 292 293 inode = iget5_locked(sb, erofs_squash_ino(sb, nid), erofs_iget5_eq, 294 erofs_iget5_set, &nid); 295 if (!inode) 296 return ERR_PTR(-ENOMEM); 297 298 if (inode->i_state & I_NEW) { 299 int err = erofs_fill_inode(inode); 300 301 if (err) { 302 iget_failed(inode); 303 return ERR_PTR(err); 304 } 305 unlock_new_inode(inode); 306 } 307 return inode; 308 } 309 310 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 311 struct kstat *stat, u32 request_mask, 312 unsigned int query_flags) 313 { 314 struct inode *const inode = d_inode(path->dentry); 315 struct block_device *bdev = inode->i_sb->s_bdev; 316 bool compressed = 317 erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout); 318 319 if (compressed) 320 stat->attributes |= STATX_ATTR_COMPRESSED; 321 stat->attributes |= STATX_ATTR_IMMUTABLE; 322 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | 323 STATX_ATTR_IMMUTABLE); 324 325 /* 326 * Return the DIO alignment restrictions if requested. 327 * 328 * In EROFS, STATX_DIOALIGN is only supported in bdev-based mode 329 * and uncompressed inodes, otherwise we report no DIO support. 330 */ 331 if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) { 332 stat->result_mask |= STATX_DIOALIGN; 333 if (bdev && !compressed) { 334 stat->dio_mem_align = bdev_dma_alignment(bdev) + 1; 335 stat->dio_offset_align = bdev_logical_block_size(bdev); 336 } 337 } 338 generic_fillattr(idmap, request_mask, inode, stat); 339 return 0; 340 } 341 342 static int erofs_ioctl_get_volume_label(struct inode *inode, void __user *arg) 343 { 344 struct erofs_sb_info *sbi = EROFS_I_SB(inode); 345 int ret; 346 347 if (!sbi->volume_name) 348 ret = clear_user(arg, 1); 349 else 350 ret = copy_to_user(arg, sbi->volume_name, 351 strlen(sbi->volume_name)); 352 return ret ? -EFAULT : 0; 353 } 354 355 long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 356 { 357 struct inode *inode = file_inode(filp); 358 void __user *argp = (void __user *)arg; 359 360 switch (cmd) { 361 case FS_IOC_GETFSLABEL: 362 return erofs_ioctl_get_volume_label(inode, argp); 363 default: 364 return -ENOTTY; 365 } 366 } 367 368 #ifdef CONFIG_COMPAT 369 long erofs_compat_ioctl(struct file *filp, unsigned int cmd, 370 unsigned long arg) 371 { 372 return erofs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); 373 } 374 #endif 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