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Date: Sat, 18 Jul 2020 05:55:06 +0800
From: kernel test robot <lkp@...el.com>
To: Theodore Ts'o <tytso@....edu>,
Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
Alex Zhuravlev <bzzz@...mcloud.com>,
Andreas Dilger <adilger@...mcloud.com>,
Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 1/4] ext4: add prefetching for block allocation bitmaps
Hi Theodore,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on tip/perf/core]
[also build test WARNING on v5.8-rc5 next-20200717]
[cannot apply to ext4/dev]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Theodore-Ts-o/ex4-block-bitmap-prefetching/20200718-000006
base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git c085fb8774671e83f6199a8e838fbc0e57094029
config: arm64-randconfig-r036-20200718 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> fs/ext4/balloc.c:501:19: warning: operator '?:' has lower precedence than '|'; '|' will be evaluated first [-Wbitwise-conditional-parentheses]
ignore_locked ? REQ_RAHEAD : 0, bh);
~~~~~~~~~~~~~ ^
fs/ext4/balloc.c:501:19: note: place parentheses around the '|' expression to silence this warning
ignore_locked ? REQ_RAHEAD : 0, bh);
~~~~~~~~~~~~~ ^
fs/ext4/balloc.c:501:19: note: place parentheses around the '?:' expression to evaluate it first
ignore_locked ? REQ_RAHEAD : 0, bh);
^
( )
1 warning generated.
vim +501 fs/ext4/balloc.c
404
405 /**
406 * ext4_read_block_bitmap_nowait()
407 * @sb: super block
408 * @block_group: given block group
409 *
410 * Read the bitmap for a given block_group,and validate the
411 * bits for block/inode/inode tables are set in the bitmaps
412 *
413 * Return buffer_head on success or an ERR_PTR in case of failure.
414 */
415 struct buffer_head *
416 ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group,
417 bool ignore_locked)
418 {
419 struct ext4_group_desc *desc;
420 struct ext4_sb_info *sbi = EXT4_SB(sb);
421 struct buffer_head *bh;
422 ext4_fsblk_t bitmap_blk;
423 int err;
424
425 desc = ext4_get_group_desc(sb, block_group, NULL);
426 if (!desc)
427 return ERR_PTR(-EFSCORRUPTED);
428 bitmap_blk = ext4_block_bitmap(sb, desc);
429 if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
430 (bitmap_blk >= ext4_blocks_count(sbi->s_es))) {
431 ext4_error(sb, "Invalid block bitmap block %llu in "
432 "block_group %u", bitmap_blk, block_group);
433 ext4_mark_group_bitmap_corrupted(sb, block_group,
434 EXT4_GROUP_INFO_BBITMAP_CORRUPT);
435 return ERR_PTR(-EFSCORRUPTED);
436 }
437 bh = sb_getblk(sb, bitmap_blk);
438 if (unlikely(!bh)) {
439 ext4_warning(sb, "Cannot get buffer for block bitmap - "
440 "block_group = %u, block_bitmap = %llu",
441 block_group, bitmap_blk);
442 return ERR_PTR(-ENOMEM);
443 }
444
445 if (ignore_locked && buffer_locked(bh)) {
446 /* buffer under IO already, return if called for prefetching */
447 put_bh(bh);
448 return NULL;
449 }
450
451 if (bitmap_uptodate(bh))
452 goto verify;
453
454 lock_buffer(bh);
455 if (bitmap_uptodate(bh)) {
456 unlock_buffer(bh);
457 goto verify;
458 }
459 ext4_lock_group(sb, block_group);
460 if (ext4_has_group_desc_csum(sb) &&
461 (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
462 if (block_group == 0) {
463 ext4_unlock_group(sb, block_group);
464 unlock_buffer(bh);
465 ext4_error(sb, "Block bitmap for bg 0 marked "
466 "uninitialized");
467 err = -EFSCORRUPTED;
468 goto out;
469 }
470 err = ext4_init_block_bitmap(sb, bh, block_group, desc);
471 set_bitmap_uptodate(bh);
472 set_buffer_uptodate(bh);
473 set_buffer_verified(bh);
474 ext4_unlock_group(sb, block_group);
475 unlock_buffer(bh);
476 if (err) {
477 ext4_error(sb, "Failed to init block bitmap for group "
478 "%u: %d", block_group, err);
479 goto out;
480 }
481 goto verify;
482 }
483 ext4_unlock_group(sb, block_group);
484 if (buffer_uptodate(bh)) {
485 /*
486 * if not uninit if bh is uptodate,
487 * bitmap is also uptodate
488 */
489 set_bitmap_uptodate(bh);
490 unlock_buffer(bh);
491 goto verify;
492 }
493 /*
494 * submit the buffer_head for reading
495 */
496 set_buffer_new(bh);
497 trace_ext4_read_block_bitmap_load(sb, block_group);
498 bh->b_end_io = ext4_end_bitmap_read;
499 get_bh(bh);
500 submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO |
> 501 ignore_locked ? REQ_RAHEAD : 0, bh);
502 return bh;
503 verify:
504 err = ext4_validate_block_bitmap(sb, desc, block_group, bh);
505 if (err)
506 goto out;
507 return bh;
508 out:
509 put_bh(bh);
510 return ERR_PTR(err);
511 }
512
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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