tree: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev head: 0a76945fd1ba2ab44da7b578b311efdfedf92e6c commit: 3258386aba670e3406a499d2d0b7395e14c8d097 [6/8] ext4: reset retry counter when ext4_alloc_file_blocks() makes progress config: i386-randconfig-m021-20210215 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> New smatch warnings: fs/ext4/extents.c:4456 ext4_alloc_file_blocks() error: uninitialized symbol 'ret'. Old smatch warnings: fs/ext4/extents.c:2396 ext4_rereserve_cluster() warn: should '(1) << sbi->s_cluster_bits' be a 64 bit type? include/linux/fs.h:861 i_size_write() warn: statement has no effect 31 fs/ext4/extents.c:5760 ext4_clu_mapped() warn: should 'lclu << sbi->s_cluster_bits' be a 64 bit type? fs/ext4/extents.c:6009 ext4_ext_replay_set_iblocks() warn: should 'numblks << (inode->i_sb->s_blocksize_bits - 9)' be a 64 bit type? vim +/ret +4456 fs/ext4/extents.c 0e8b6879f3c234 Lukas Czerner 2014-03-18 4379 static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset, c174e6d6979a04 Dmitry Monakhov 2014-08-27 4380 ext4_lblk_t len, loff_t new_size, ^^^^^^^^^^^^^^^ Can "len" be zero? If so then we have a problem, if not then this is a false positive. 77a2e84d51729d Tahsin Erdogan 2017-08-05 4381 int flags) 0e8b6879f3c234 Lukas Czerner 2014-03-18 4382 { 0e8b6879f3c234 Lukas Czerner 2014-03-18 4383 struct inode *inode = file_inode(file); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4384 handle_t *handle; 3258386aba670e Eric Whitney 2021-01-13 4385 int ret, ret2 = 0, ret3 = 0; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4386 int retries = 0; 4134f5c88dcd5b Lukas Czerner 2015-06-15 4387 int depth = 0; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4388 struct ext4_map_blocks map; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4389 unsigned int credits; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4390 loff_t epos; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4391 c3fe493ccdb1f4 Fabian Frederick 2016-09-15 4392 BUG_ON(!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4393 map.m_lblk = offset; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4394 map.m_len = len; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4395 /* 0e8b6879f3c234 Lukas Czerner 2014-03-18 4396 * Don't normalize the request if it can fit in one extent so 0e8b6879f3c234 Lukas Czerner 2014-03-18 4397 * that it doesn't get unnecessarily split into multiple 0e8b6879f3c234 Lukas Czerner 2014-03-18 4398 * extents. 0e8b6879f3c234 Lukas Czerner 2014-03-18 4399 */ 556615dcbf38b0 Lukas Czerner 2014-04-20 4400 if (len <= EXT_UNWRITTEN_MAX_LEN) 0e8b6879f3c234 Lukas Czerner 2014-03-18 4401 flags |= EXT4_GET_BLOCKS_NO_NORMALIZE; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4402 0e8b6879f3c234 Lukas Czerner 2014-03-18 4403 /* 0e8b6879f3c234 Lukas Czerner 2014-03-18 4404 * credits to insert 1 extent into extent tree 0e8b6879f3c234 Lukas Czerner 2014-03-18 4405 */ 0e8b6879f3c234 Lukas Czerner 2014-03-18 4406 credits = ext4_chunk_trans_blocks(inode, len); 4134f5c88dcd5b Lukas Czerner 2015-06-15 4407 depth = ext_depth(inode); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4408 0e8b6879f3c234 Lukas Czerner 2014-03-18 4409 retry: 3258386aba670e Eric Whitney 2021-01-13 4410 while (len) { ^^^^^^^^^^^^^ 4134f5c88dcd5b Lukas Czerner 2015-06-15 4411 /* 4134f5c88dcd5b Lukas Czerner 2015-06-15 4412 * Recalculate credits when extent tree depth changes. 4134f5c88dcd5b Lukas Czerner 2015-06-15 4413 */ 011c88e36c26a0 Dan Carpenter 2016-12-03 4414 if (depth != ext_depth(inode)) { 4134f5c88dcd5b Lukas Czerner 2015-06-15 4415 credits = ext4_chunk_trans_blocks(inode, len); 4134f5c88dcd5b Lukas Czerner 2015-06-15 4416 depth = ext_depth(inode); 4134f5c88dcd5b Lukas Czerner 2015-06-15 4417 } 4134f5c88dcd5b Lukas Czerner 2015-06-15 4418 0e8b6879f3c234 Lukas Czerner 2014-03-18 4419 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, 0e8b6879f3c234 Lukas Czerner 2014-03-18 4420 credits); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4421 if (IS_ERR(handle)) { 0e8b6879f3c234 Lukas Czerner 2014-03-18 4422 ret = PTR_ERR(handle); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4423 break; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4424 } 0e8b6879f3c234 Lukas Czerner 2014-03-18 4425 ret = ext4_map_blocks(handle, inode, &map, flags); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4426 if (ret <= 0) { 0e8b6879f3c234 Lukas Czerner 2014-03-18 4427 ext4_debug("inode #%lu: block %u: len %u: " 0e8b6879f3c234 Lukas Czerner 2014-03-18 4428 "ext4_ext_map_blocks returned %d", 0e8b6879f3c234 Lukas Czerner 2014-03-18 4429 inode->i_ino, map.m_lblk, 0e8b6879f3c234 Lukas Czerner 2014-03-18 4430 map.m_len, ret); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4431 ext4_mark_inode_dirty(handle, inode); 3258386aba670e Eric Whitney 2021-01-13 4432 ext4_journal_stop(handle); 0e8b6879f3c234 Lukas Czerner 2014-03-18 4433 break; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4434 } 3258386aba670e Eric Whitney 2021-01-13 4435 /* 3258386aba670e Eric Whitney 2021-01-13 4436 * allow a full retry cycle for any remaining allocations 3258386aba670e Eric Whitney 2021-01-13 4437 */ 3258386aba670e Eric Whitney 2021-01-13 4438 retries = 0; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4439 map.m_lblk += ret; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4440 map.m_len = len = len - ret; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4441 epos = (loff_t)map.m_lblk << inode->i_blkbits; eeca7ea1baa939 Deepa Dinamani 2016-11-14 4442 inode->i_ctime = current_time(inode); c174e6d6979a04 Dmitry Monakhov 2014-08-27 4443 if (new_size) { c174e6d6979a04 Dmitry Monakhov 2014-08-27 4444 if (epos > new_size) c174e6d6979a04 Dmitry Monakhov 2014-08-27 4445 epos = new_size; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4446 if (ext4_update_inode_size(inode, epos) & 0x1) c174e6d6979a04 Dmitry Monakhov 2014-08-27 4447 inode->i_mtime = inode->i_ctime; c174e6d6979a04 Dmitry Monakhov 2014-08-27 4448 } 4209ae12b12265 Harshad Shirwadkar 2020-04-26 4449 ret2 = ext4_mark_inode_dirty(handle, inode); c894aa97577e47 Eryu Guan 2017-12-03 4450 ext4_update_inode_fsync_trans(handle, inode, 1); 4209ae12b12265 Harshad Shirwadkar 2020-04-26 4451 ret3 = ext4_journal_stop(handle); 4209ae12b12265 Harshad Shirwadkar 2020-04-26 4452 ret2 = ret3 ? ret3 : ret2; 4209ae12b12265 Harshad Shirwadkar 2020-04-26 4453 if (unlikely(ret2)) 0e8b6879f3c234 Lukas Czerner 2014-03-18 4454 break; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4455 } 3258386aba670e Eric Whitney 2021-01-13 @4456 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) ^^^^^^^^^^^^^^ 0e8b6879f3c234 Lukas Czerner 2014-03-18 4457 goto retry; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4458 0e8b6879f3c234 Lukas Czerner 2014-03-18 4459 return ret > 0 ? ret2 : ret; 0e8b6879f3c234 Lukas Czerner 2014-03-18 4460 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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