From: kernel test robot <lkp@intel.com>
To: Artem Blagodarenko <artem.blagodarenko@gmail.com>
Cc: oe-kbuild-all@lists.linux.dev, 0day robot <lkp@intel.com>,
Andreas Dilger <adilger@dilger.ca>
Subject: fs/ext4/dir.c:240:35: error: implicit declaration of function 'ext4_dir_rec_len'; did you mean 'ext4_dirent_rec_len'?
Date: Wed, 05 Aug 2026 06:09:52 +0200 [thread overview]
Message-ID: <202608050643.HsEEkMSm-lkp@intel.com> (raw)
Hi Artem,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://github.com/intel-lab-lkp/linux/commits/Artem-Blagodarenko/ext4-validate-count-against-limit-in-ext4_dx_csum_verify-_set/20260805-014713
head: 27d843e077693d33ed950cae73845ae35cce500e
commit: e4749d23faefb3c72aa0acb948dbd2b325177576 ext4: rename ext4_dir_rec_len() and clarify dirdata usage
date: 10 hours ago
config: s390-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260805/202608050643.HsEEkMSm-lkp@intel.com/config)
compiler: s390x-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260805/202608050643.HsEEkMSm-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608050643.HsEEkMSm-lkp@intel.com/
All errors (new ones prefixed by >>):
fs/ext4/dir.c: In function 'ext4_readdir':
>> fs/ext4/dir.c:240:35: error: implicit declaration of function 'ext4_dir_rec_len'; did you mean 'ext4_dirent_rec_len'? [-Wimplicit-function-declaration]
240 | ext4_dir_rec_len(1, has_csum ? NULL : inode) &&
| ^~~~~~~~~~~~~~~~
| ext4_dirent_rec_len
--
fs/ext4/inline.c: In function 'ext4_read_inline_dir':
>> fs/ext4/inline.c:1466:33: error: implicit declaration of function 'ext4_dir_rec_len'; did you mean 'ext4_dirent_rec_len'? [-Wimplicit-function-declaration]
1466 | if (i + ext4_dir_rec_len(1, NULL) > extra_size)
| ^~~~~~~~~~~~~~~~
| ext4_dirent_rec_len
--
fs/ext4/namei.c: In function 'ext4_search_dir':
>> fs/ext4/namei.c:1515:35: error: implicit declaration of function 'ext4_dir_rec_len'; did you mean 'ext4_dirent_rec_len'? [-Wimplicit-function-declaration]
1515 | (char *)de + ext4_dir_rec_len(de->name_len, dir) <= dlimit) &&
| ^~~~~~~~~~~~~~~~
| ext4_dirent_rec_len
fs/ext4/namei.c: In function 'add_dirent_to_buf':
fs/ext4/namei.c:2168:23: error: too few arguments to function 'ext4_find_dest_de'
2168 | err = ext4_find_dest_de(dir, bh, bh->b_data,
| ^~~~~~~~~~~~~~~~~
fs/ext4/namei.c:2081:5: note: declared here
2081 | int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh,
| ^~~~~~~~~~~~~~~~~
vim +240 fs/ext4/dir.c
ac27a0ec112a08 Dave Kleikamp 2006-10-11 128
725bebb27882ae Al Viro 2013-05-17 129 static int ext4_readdir(struct file *file, struct dir_context *ctx)
ac27a0ec112a08 Dave Kleikamp 2006-10-11 130 {
498e5f24158da7 Theodore Ts'o 2008-11-05 131 unsigned int offset;
aa13d5f67c6f5f Giedrius Rekasius 2014-05-27 132 int i;
617ba13b31fbf5 Mingming Cao 2006-10-11 133 struct ext4_dir_entry_2 *de;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 134 int err;
725bebb27882ae Al Viro 2013-05-17 135 struct inode *inode = file_inode(file);
d1f5273e9adb40 Fan Yong 2012-03-18 136 struct super_block *sb = inode->i_sb;
4461471107b79b Michael Halcrow 2015-04-12 137 struct buffer_head *bh = NULL;
a7550b30ab709f Jaegeuk Kim 2016-07-10 138 struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
4f05ee2f82b470 Christian Brauner 2024-08-30 139 struct dir_private_info *info = file->private_data;
bc4b7b0414c33b Yao Kai 2026-07-06 140 bool has_csum = ext4_has_feature_metadata_csum(sb);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 141
ec0caa974cd092 Eric Biggers 2020-12-02 142 err = fscrypt_prepare_readdir(inode);
3b1ada55b905f3 Eric Biggers 2019-12-09 143 if (err)
28b4c263961c47 Theodore Ts'o 2016-02-07 144 return err;
28b4c263961c47 Theodore Ts'o 2016-02-07 145
d1f5273e9adb40 Fan Yong 2012-03-18 146 if (is_dx_dir(inode)) {
725bebb27882ae Al Viro 2013-05-17 147 err = ext4_dx_readdir(file, ctx);
400086d7c11327 Milan Djurovic 2021-03-15 148 if (err != ERR_BAD_DX_DIR)
725bebb27882ae Al Viro 2013-05-17 149 return err;
400086d7c11327 Milan Djurovic 2021-03-15 150
48a34311953d92 Jan Kara 2020-02-10 151 /* Can we just clear INDEX flag to ignore htree information? */
bc4b7b0414c33b Yao Kai 2026-07-06 152 if (!has_csum) {
ac27a0ec112a08 Dave Kleikamp 2006-10-11 153 /*
ac27a0ec112a08 Dave Kleikamp 2006-10-11 154 * We don't set the inode dirty flag since it's not
48a34311953d92 Jan Kara 2020-02-10 155 * critical that it gets flushed back to the disk.
ac27a0ec112a08 Dave Kleikamp 2006-10-11 156 */
48a34311953d92 Jan Kara 2020-02-10 157 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
48a34311953d92 Jan Kara 2020-02-10 158 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 159 }
8af0f082279770 Tao Ma 2013-04-19 160
8af0f082279770 Tao Ma 2013-04-19 161 if (ext4_has_inline_data(inode)) {
8af0f082279770 Tao Ma 2013-04-19 162 int has_inline_data = 1;
4461471107b79b Michael Halcrow 2015-04-12 163 err = ext4_read_inline_dir(file, ctx,
8af0f082279770 Tao Ma 2013-04-19 164 &has_inline_data);
8af0f082279770 Tao Ma 2013-04-19 165 if (has_inline_data)
4461471107b79b Michael Halcrow 2015-04-12 166 return err;
4461471107b79b Michael Halcrow 2015-04-12 167 }
4461471107b79b Michael Halcrow 2015-04-12 168
592ddec7578a33 Chandan Rajendra 2018-12-12 169 if (IS_ENCRYPTED(inode)) {
8b10fe68985278 Jeff Layton 2020-08-10 170 err = fscrypt_fname_alloc_buffer(EXT4_NAME_LEN, &fstr);
b7236e21d55ff9 Theodore Ts'o 2015-05-18 171 if (err < 0)
4461471107b79b Michael Halcrow 2015-04-12 172 return err;
4461471107b79b Michael Halcrow 2015-04-12 173 }
8af0f082279770 Tao Ma 2013-04-19 174
725bebb27882ae Al Viro 2013-05-17 175 while (ctx->pos < inode->i_size) {
2ed886852adfcb Theodore Ts'o 2010-05-16 176 struct ext4_map_blocks map;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 177
1f60fbe7274918 Theodore Ts'o 2016-04-23 178 if (fatal_signal_pending(current)) {
1f60fbe7274918 Theodore Ts'o 2016-04-23 179 err = -ERESTARTSYS;
1f60fbe7274918 Theodore Ts'o 2016-04-23 180 goto errout;
1f60fbe7274918 Theodore Ts'o 2016-04-23 181 }
1f60fbe7274918 Theodore Ts'o 2016-04-23 182 cond_resched();
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 183 offset = ctx->pos & (sb->s_blocksize - 1);
725bebb27882ae Al Viro 2013-05-17 184 map.m_lblk = ctx->pos >> EXT4_BLOCK_SIZE_BITS(sb);
2ed886852adfcb Theodore Ts'o 2010-05-16 185 map.m_len = 1;
2ed886852adfcb Theodore Ts'o 2010-05-16 186 err = ext4_map_blocks(NULL, inode, &map, 0);
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 187 if (err == 0) {
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 188 /* m_len should never be zero but let's avoid
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 189 * an infinite loop if it somehow is */
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 190 if (map.m_len == 0)
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 191 map.m_len = 1;
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 192 ctx->pos += map.m_len * sb->s_blocksize;
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 193 continue;
4e19d6b65fb4fc Theodore Ts'o 2019-06-20 194 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 195 if (err > 0) {
609c5e0081b432 Baokun Li 2025-11-21 196 pgoff_t index = map.m_pblk << inode->i_blkbits >>
609c5e0081b432 Baokun Li 2025-11-21 197 PAGE_SHIFT;
725bebb27882ae Al Viro 2013-05-17 198 if (!ra_has_index(&file->f_ra, index))
cf914a7d656e62 Rusty Russell 2007-07-19 199 page_cache_sync_readahead(
224941e8379a0d Al Viro 2024-04-11 200 sb->s_bdev->bd_mapping,
609c5e0081b432 Baokun Li 2025-11-21 201 &file->f_ra, file, index,
609c5e0081b432 Baokun Li 2025-11-21 202 1 << EXT4_SB(sb)->s_min_folio_order);
09cbfeaf1a5a67 Kiryl Shutsemau 2016-04-01 203 file->f_ra.prev_pos = (loff_t)index << PAGE_SHIFT;
1c2150283cae89 Theodore Ts'o 2014-08-29 204 bh = ext4_bread(NULL, inode, map.m_lblk, 0);
c906f38e8853cf Kirill Tkhai 2016-02-16 205 if (IS_ERR(bh)) {
c906f38e8853cf Kirill Tkhai 2016-02-16 206 err = PTR_ERR(bh);
c906f38e8853cf Kirill Tkhai 2016-02-16 207 bh = NULL;
c906f38e8853cf Kirill Tkhai 2016-02-16 208 goto errout;
c906f38e8853cf Kirill Tkhai 2016-02-16 209 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 210 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 211
ac27a0ec112a08 Dave Kleikamp 2006-10-11 212 if (!bh) {
e6c4021190c828 Eric Sandeen 2006-12-06 213 /* corrupt size? Maybe no more blocks to read */
725bebb27882ae Al Viro 2013-05-17 214 if (ctx->pos > inode->i_blocks << 9)
e6c4021190c828 Eric Sandeen 2006-12-06 215 break;
725bebb27882ae Al Viro 2013-05-17 216 ctx->pos += sb->s_blocksize - offset;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 217 continue;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 218 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 219
b0336e8d2108e6 Darrick J. Wong 2012-04-29 220 /* Check the checksum */
b0336e8d2108e6 Darrick J. Wong 2012-04-29 221 if (!buffer_verified(bh) &&
f036adb3997646 Theodore Ts'o 2019-06-21 222 !ext4_dirblock_csum_verify(inode, bh)) {
725bebb27882ae Al Viro 2013-05-17 223 EXT4_ERROR_FILE(file, 0, "directory fails checksum "
b0336e8d2108e6 Darrick J. Wong 2012-04-29 224 "at offset %llu",
725bebb27882ae Al Viro 2013-05-17 225 (unsigned long long)ctx->pos);
725bebb27882ae Al Viro 2013-05-17 226 ctx->pos += sb->s_blocksize - offset;
d5ac7773051602 Guo Chao 2013-01-28 227 brelse(bh);
4461471107b79b Michael Halcrow 2015-04-12 228 bh = NULL;
b0336e8d2108e6 Darrick J. Wong 2012-04-29 229 continue;
b0336e8d2108e6 Darrick J. Wong 2012-04-29 230 }
b0336e8d2108e6 Darrick J. Wong 2012-04-29 231 set_buffer_verified(bh);
b0336e8d2108e6 Darrick J. Wong 2012-04-29 232
ac27a0ec112a08 Dave Kleikamp 2006-10-11 233 /* If the dir block has changed since the last call to
ac27a0ec112a08 Dave Kleikamp 2006-10-11 234 * readdir(2), then we might be pointing to an invalid
ac27a0ec112a08 Dave Kleikamp 2006-10-11 235 * dirent right now. Scan from the start of the block
ac27a0ec112a08 Dave Kleikamp 2006-10-11 236 * to make sure. */
4f05ee2f82b470 Christian Brauner 2024-08-30 237 if (!inode_eq_iversion(inode, info->cookie)) {
bc4b7b0414c33b Yao Kai 2026-07-06 238 for (i = 0;
bc4b7b0414c33b Yao Kai 2026-07-06 239 i <= sb->s_blocksize -
bc4b7b0414c33b Yao Kai 2026-07-06 @240 ext4_dir_rec_len(1, has_csum ? NULL : inode) &&
bc4b7b0414c33b Yao Kai 2026-07-06 241 i < offset;) {
617ba13b31fbf5 Mingming Cao 2006-10-11 242 de = (struct ext4_dir_entry_2 *)
ac27a0ec112a08 Dave Kleikamp 2006-10-11 243 (bh->b_data + i);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 244 /* It's too expensive to do a full
ac27a0ec112a08 Dave Kleikamp 2006-10-11 245 * dirent test each time round this
ac27a0ec112a08 Dave Kleikamp 2006-10-11 246 * loop, but we do have to test at
ac27a0ec112a08 Dave Kleikamp 2006-10-11 247 * least that it is non-zero. A
ac27a0ec112a08 Dave Kleikamp 2006-10-11 248 * failure will be detected in the
ac27a0ec112a08 Dave Kleikamp 2006-10-11 249 * dirent test below. */
3d0518f4758eca Wei Yongjun 2009-02-14 250 if (ext4_rec_len_from_disk(de->rec_len,
e4749d23faefb3 Artem Blagodarenko 2026-07-27 251 sb->s_blocksize) < ext4_dirent_rec_len(1,
471fbbea7ff706 Daniel Rosenberg 2021-03-19 252 inode))
ac27a0ec112a08 Dave Kleikamp 2006-10-11 253 break;
3d0518f4758eca Wei Yongjun 2009-02-14 254 i += ext4_rec_len_from_disk(de->rec_len,
3d0518f4758eca Wei Yongjun 2009-02-14 255 sb->s_blocksize);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 256 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 257 offset = i;
725bebb27882ae Al Viro 2013-05-17 258 ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1))
ac27a0ec112a08 Dave Kleikamp 2006-10-11 259 | offset;
4f05ee2f82b470 Christian Brauner 2024-08-30 260 info->cookie = inode_query_iversion(inode);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 261 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 262
bc4b7b0414c33b Yao Kai 2026-07-06 263 if (unlikely(offset < sb->s_blocksize &&
bc4b7b0414c33b Yao Kai 2026-07-06 264 offset > sb->s_blocksize -
bc4b7b0414c33b Yao Kai 2026-07-06 265 ext4_dir_rec_len(1, has_csum ? NULL : inode))) {
bc4b7b0414c33b Yao Kai 2026-07-06 266 EXT4_ERROR_FILE(file, bh->b_blocknr,
bc4b7b0414c33b Yao Kai 2026-07-06 267 "bad entry in directory: %s - offset=%u, size=%lu",
bc4b7b0414c33b Yao Kai 2026-07-06 268 "directory entry too close to block end",
bc4b7b0414c33b Yao Kai 2026-07-06 269 offset, sb->s_blocksize);
bc4b7b0414c33b Yao Kai 2026-07-06 270 ctx->pos = round_up(ctx->pos, sb->s_blocksize);
bc4b7b0414c33b Yao Kai 2026-07-06 271 goto next_block;
bc4b7b0414c33b Yao Kai 2026-07-06 272 }
bc4b7b0414c33b Yao Kai 2026-07-06 273
725bebb27882ae Al Viro 2013-05-17 274 while (ctx->pos < inode->i_size
ac27a0ec112a08 Dave Kleikamp 2006-10-11 275 && offset < sb->s_blocksize) {
617ba13b31fbf5 Mingming Cao 2006-10-11 276 de = (struct ext4_dir_entry_2 *) (bh->b_data + offset);
725bebb27882ae Al Viro 2013-05-17 277 if (ext4_check_dir_entry(inode, file, de, bh,
226ba972b08637 Tao Ma 2012-12-10 278 bh->b_data, bh->b_size,
226ba972b08637 Tao Ma 2012-12-10 279 offset)) {
63f5793351d821 Andrew Morton 2006-10-11 280 /*
725bebb27882ae Al Viro 2013-05-17 281 * On error, skip to the next block
63f5793351d821 Andrew Morton 2006-10-11 282 */
725bebb27882ae Al Viro 2013-05-17 283 ctx->pos = (ctx->pos |
ac27a0ec112a08 Dave Kleikamp 2006-10-11 284 (sb->s_blocksize - 1)) + 1;
725bebb27882ae Al Viro 2013-05-17 285 break;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 286 }
3d0518f4758eca Wei Yongjun 2009-02-14 287 offset += ext4_rec_len_from_disk(de->rec_len,
3d0518f4758eca Wei Yongjun 2009-02-14 288 sb->s_blocksize);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 289 if (le32_to_cpu(de->inode)) {
592ddec7578a33 Chandan Rajendra 2018-12-12 290 if (!IS_ENCRYPTED(inode)) {
725bebb27882ae Al Viro 2013-05-17 291 if (!dir_emit(ctx, de->name,
ac27a0ec112a08 Dave Kleikamp 2006-10-11 292 de->name_len,
ac27a0ec112a08 Dave Kleikamp 2006-10-11 293 le32_to_cpu(de->inode),
4461471107b79b Michael Halcrow 2015-04-12 294 get_dtype(sb, de->file_type)))
4461471107b79b Michael Halcrow 2015-04-12 295 goto done;
4461471107b79b Michael Halcrow 2015-04-12 296 } else {
a7550b30ab709f Jaegeuk Kim 2016-07-10 297 int save_len = fstr.len;
a7550b30ab709f Jaegeuk Kim 2016-07-10 298 struct fscrypt_str de_name =
a7550b30ab709f Jaegeuk Kim 2016-07-10 299 FSTR_INIT(de->name,
a7550b30ab709f Jaegeuk Kim 2016-07-10 300 de->name_len);
70dd7b573afeba yao.ly 2024-07-01 301 u32 hash;
70dd7b573afeba yao.ly 2024-07-01 302 u32 minor_hash;
70dd7b573afeba yao.ly 2024-07-01 303
70dd7b573afeba yao.ly 2024-07-01 304 if (IS_CASEFOLDED(inode)) {
70dd7b573afeba yao.ly 2024-07-01 305 hash = EXT4_DIRENT_HASH(de);
70dd7b573afeba yao.ly 2024-07-01 306 minor_hash = EXT4_DIRENT_MINOR_HASH(de);
70dd7b573afeba yao.ly 2024-07-01 307 } else {
70dd7b573afeba yao.ly 2024-07-01 308 hash = 0;
70dd7b573afeba yao.ly 2024-07-01 309 minor_hash = 0;
70dd7b573afeba yao.ly 2024-07-01 310 }
d229959072eba4 Theodore Ts'o 2015-05-18 311
4461471107b79b Michael Halcrow 2015-04-12 312 /* Directory is encrypted */
a7550b30ab709f Jaegeuk Kim 2016-07-10 313 err = fscrypt_fname_disk_to_usr(inode,
70dd7b573afeba yao.ly 2024-07-01 314 hash, minor_hash, &de_name, &fstr);
ef1eb3aa50930f Eric Biggers 2016-09-15 315 de_name = fstr;
a7550b30ab709f Jaegeuk Kim 2016-07-10 316 fstr.len = save_len;
ef1eb3aa50930f Eric Biggers 2016-09-15 317 if (err)
4461471107b79b Michael Halcrow 2015-04-12 318 goto errout;
4461471107b79b Michael Halcrow 2015-04-12 319 if (!dir_emit(ctx,
ef1eb3aa50930f Eric Biggers 2016-09-15 320 de_name.name, de_name.len,
4461471107b79b Michael Halcrow 2015-04-12 321 le32_to_cpu(de->inode),
4461471107b79b Michael Halcrow 2015-04-12 322 get_dtype(sb, de->file_type)))
4461471107b79b Michael Halcrow 2015-04-12 323 goto done;
725bebb27882ae Al Viro 2013-05-17 324 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 325 }
725bebb27882ae Al Viro 2013-05-17 326 ctx->pos += ext4_rec_len_from_disk(de->rec_len,
3d0518f4758eca Wei Yongjun 2009-02-14 327 sb->s_blocksize);
ac27a0ec112a08 Dave Kleikamp 2006-10-11 328 }
bc4b7b0414c33b Yao Kai 2026-07-06 329 next_block:
ae05327a00fd47 Al Viro 2016-05-12 330 if ((ctx->pos < inode->i_size) && !dir_relax_shared(inode))
4461471107b79b Michael Halcrow 2015-04-12 331 goto done;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 332 brelse(bh);
4461471107b79b Michael Halcrow 2015-04-12 333 bh = NULL;
725bebb27882ae Al Viro 2013-05-17 334 }
4461471107b79b Michael Halcrow 2015-04-12 335 done:
4461471107b79b Michael Halcrow 2015-04-12 336 err = 0;
4461471107b79b Michael Halcrow 2015-04-12 337 errout:
a7550b30ab709f Jaegeuk Kim 2016-07-10 338 fscrypt_fname_free_buffer(&fstr);
4461471107b79b Michael Halcrow 2015-04-12 339 brelse(bh);
4461471107b79b Michael Halcrow 2015-04-12 340 return err;
ac27a0ec112a08 Dave Kleikamp 2006-10-11 341 }
ac27a0ec112a08 Dave Kleikamp 2006-10-11 342
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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