linux-ext4 - [PATCH] ext4: ext4_da_convert_inline_data_to

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Date:	Tue,  2 Dec 2014 18:28:20 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-ext4@...r.kernel.org
Cc:	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH] ext4: ext4_da_convert_inline_data_to_extent drop locked page after error

Testcase:
xfstests generic/270
MKFS_OPTIONS="-q -I 256 -O inline_data,64bit"

Call Trace:
 [<ffffffff81144c76>] lock_page+0x35/0x39 -------> DEADLOCK
 [<ffffffff81145260>] pagecache_get_page+0x65/0x15a
 [<ffffffff811507fc>] truncate_inode_pages_range+0x1db/0x45c
 [<ffffffff8120ea63>] ? ext4_da_get_block_prep+0x439/0x4b6
 [<ffffffff811b29b7>] ? __block_write_begin+0x284/0x29c
 [<ffffffff8120e62a>] ? ext4_change_inode_journal_flag+0x16b/0x16b
 [<ffffffff81150af0>] truncate_inode_pages+0x12/0x14
 [<ffffffff81247cb4>] ext4_truncate_failed_write+0x19/0x25
 [<ffffffff812488cf>] ext4_da_write_inline_data_begin+0x196/0x31c
 [<ffffffff81210dad>] ext4_da_write_begin+0x189/0x302
 [<ffffffff810c07ac>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff810ddd13>] ? read_seqcount_begin.clone.1+0x9f/0xcc
 [<ffffffff8114309d>] generic_perform_write+0xc7/0x1c6
 [<ffffffff810c040e>] ? mark_held_locks+0x59/0x77
 [<ffffffff811445d1>] __generic_file_write_iter+0x17f/0x1c5
 [<ffffffff8120726b>] ext4_file_write_iter+0x2a5/0x354
 [<ffffffff81185656>] ? file_start_write+0x2a/0x2c
 [<ffffffff8107bcdb>] ? bad_area_nosemaphore+0x13/0x15
 [<ffffffff811858ce>] new_sync_write+0x8a/0xb2
 [<ffffffff81186e7b>] vfs_write+0xb5/0x14d
 [<ffffffff81186ffb>] SyS_write+0x5c/0x8c
 [<ffffffff816f2529>] system_call_fastpath+0x12/0x17

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/inline.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index d3d8192..8edb224 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -811,6 +811,9 @@ static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 	ret = __block_write_begin(page, 0, inline_size,
 				  ext4_da_get_block_prep);
 	if (ret) {
+		unlock_page(page);
+		page_cache_release(page);
+		page = NULL;
 		ext4_truncate_failed_write(inode);
 		goto out;
 	}
-- 
1.7.1

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