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Date: Fri, 14 Aug 2020 15:32:35 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: kernel test robot <lkp@...el.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>,
Julia Lawall <Julia.Lawall@...6.fr>,
Nicolas Palix <nicolas.palix@...g.fr>
Subject: Re: fs/ocfs2/suballoc.c:2430:2-8: preceding lock on line 2413
On Fri, Aug 14 2020 at 14:11, kernel test robot wrote:
>
> coccinelle warnings: (new ones prefixed by >>)
>
>>> fs/ocfs2/suballoc.c:2430:2-8: preceding lock on line 2413
>
> vim +2430 fs/ocfs2/suballoc.c
>
> 415cb800375cc4 Mark Fasheh 2007-09-16 2379
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2380 static int ocfs2_block_group_clear_bits(handle_t *handle,
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2381 struct inode *alloc_inode,
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2382 struct ocfs2_group_desc *bg,
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2383 struct buffer_head *group_bh,
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2384 unsigned int bit_off,
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2385 unsigned int num_bits,
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2386 void (*undo_fn)(unsigned int bit,
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2387 unsigned long *bmap))
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2388 {
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2389 int status;
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2390 unsigned int tmp;
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2391 struct ocfs2_group_desc *undo_bg = NULL;
> 464170647b5648 Thomas Gleixner 2019-08-09 2392 struct journal_head *jh;
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2393
> 42035306132802 Joel Becker 2008-11-13 2394 /* The caller got this descriptor from
> 42035306132802 Joel Becker 2008-11-13 2395 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */
> 42035306132802 Joel Becker 2008-11-13 2396 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2397
> 2f73e135b83c50 Tao Ma 2011-02-22 2398 trace_ocfs2_block_group_clear_bits(bit_off, num_bits);
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2399
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2400 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode));
> 0cf2f7632b1789 Joel Becker 2009-02-12 2401 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode),
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2402 group_bh,
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2403 undo_fn ?
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2404 OCFS2_JOURNAL_ACCESS_UNDO :
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2405 OCFS2_JOURNAL_ACCESS_WRITE);
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2406 if (status < 0) {
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2407 mlog_errno(status);
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2408 goto bail;
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2409 }
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2410
> 464170647b5648 Thomas Gleixner 2019-08-09 2411 jh = bh2jh(group_bh);
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2412 if (undo_fn) {
> 464170647b5648 Thomas Gleixner 2019-08-09 @2413 spin_lock(&jh->b_state_lock);
> 464170647b5648 Thomas Gleixner 2019-08-09 2414 undo_bg = (struct ocfs2_group_desc *) jh->b_committed_data;
> 94e41ecfe0f202 Sunil Mushran 2009-06-19 2415 BUG_ON(!undo_bg);
> 94e41ecfe0f202 Sunil Mushran 2009-06-19 2416 }
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2417
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2418 tmp = num_bits;
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2419 while(tmp--) {
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2420 ocfs2_clear_bit((bit_off + tmp),
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2421 (unsigned long *) bg->bg_bitmap);
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2422 if (undo_fn)
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2423 undo_fn(bit_off + tmp,
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2424 (unsigned long *) undo_bg->bg_bitmap);
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2425 }
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2426 le16_add_cpu(&bg->bg_free_bits_count, num_bits);
> 9b5cd10e4c14a1 Srinivas Eeda 2010-10-05 2427 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
> e75ed71be4f2f7 Changwei Ge 2018-01-31 2428 if (undo_fn)
> 464170647b5648 Thomas Gleixner 2019-08-09 2429 spin_unlock(&jh->b_state_lock);
> 7ecef14ab1db96 Joe Perches 2015-09-04 @2430 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n",
> 9b5cd10e4c14a1 Srinivas Eeda 2010-10-05 2431 (unsigned long long)le64_to_cpu(bg->bg_blkno),
> 9b5cd10e4c14a1 Srinivas Eeda 2010-10-05 2432 le16_to_cpu(bg->bg_bits),
> 7ecef14ab1db96 Joe Perches 2015-09-04 2433 le16_to_cpu(bg->bg_free_bits_count),
> 7ecef14ab1db96 Joe Perches 2015-09-04 2434 num_bits);
> 9b5cd10e4c14a1 Srinivas Eeda 2010-10-05 2435 }
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2436
> b4414eea0e7b9c Mark Fasheh 2010-03-11 2437 if (undo_fn)
> 464170647b5648 Thomas Gleixner 2019-08-09 2438 spin_unlock(&jh->b_state_lock);
> 94e41ecfe0f202 Sunil Mushran 2009-06-19 2439
> ec20cec7a35158 Joel Becker 2010-03-19 2440 ocfs2_journal_dirty(handle, group_bh);
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2441 bail:
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2442 return status;
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2443 }
> ccd979bdbce9fb Mark Fasheh 2005-12-15 2444
That's clearly a false positive. Is there anything what can be done to
help that cocci script here?
Thanks,
tglx
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