From: Mauricio Faria de Oliveira <mfo@canonical.com>
To: linux-ext4@vger.kernel.org, "Theodore Y. Ts'o" <tytso@mit.edu>
Cc: dann frazier <dann.frazier@canonical.com>,
Andreas Dilger <adilger@dilger.ca>, Jan Kara <jack@suse.com>
Subject: [RFC PATCH 08/11] ext4: data=journal: prevent journalled writeback deadlock in ext4_convert_inline_data_to_extent()
Date: Thu, 23 Apr 2020 20:37:02 -0300 [thread overview]
Message-ID: <20200423233705.5878-9-mfo@canonical.com> (raw)
In-Reply-To: <20200423233705.5878-1-mfo@canonical.com>
This patch checks for and prevents the deadlock with a page in
journalled writeback in ext4_convert_inline_data_to_extent().
Finally, add wait_on_page_writeback() if data=journal mode.
Note: similar changes are not needed in ext4_da_convert_inline_data_to_extent()
as delayed allocation is not applicable to data journalling
(different struct address_space_operations).
Signed-off-by: Mauricio Faria de Oliveira <mfo@canonical.com>
---
fs/ext4/inline.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 5fd275098d10..10665b066bb7 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -562,6 +562,8 @@ static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
handle = NULL;
goto out;
}
+ if (ext4_should_journal_data(inode))
+ wait_on_page_writeback(page);
unlock_page(page);
retry_journal:
@@ -581,9 +583,19 @@ static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
put_page(page);
ext4_journal_stop(handle);
goto retry_grab;
+ } else if (ext4_should_journal_data(inode) &&
+ ext4_check_journalled_writeback(handle, page)) {
+ /* Or transaction may block page writeback */
+ unlock_page(page);
+ put_page(page);
+ ext4_journal_stop(handle);
+ ext4_start_commit_datasync(inode);
+ goto retry_grab;
}
/* In case writeback began while the page was unlocked */
wait_for_stable_page(page);
+ if (ext4_should_journal_data(inode))
+ wait_on_page_writeback(page);
ext4_write_lock_xattr(inode, &no_expand);
sem_held = 1;
--
2.20.1
next prev parent reply other threads:[~2020-04-23 23:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-23 23:36 [RFC PATCH 00/11] ext4: data=journal: writeback mmap'ed pagecache Mauricio Faria de Oliveira
2020-04-23 23:36 ` [RFC PATCH 01/11] ext4: data=journal: introduce struct/kmem_cache ext4_journalled_wb_page/_cachep Mauricio Faria de Oliveira
2020-04-23 23:36 ` [RFC PATCH 02/11] ext4: data=journal: handle page writeback in __ext4_journalled_writepage() Mauricio Faria de Oliveira
2020-04-23 23:36 ` [RFC PATCH 03/11] ext4: data=journal: call ext4_force_commit() in ext4_writepages() for msync() Mauricio Faria de Oliveira
2020-04-23 23:36 ` [RFC PATCH 04/11] ext4: data=journal: introduce helpers for journalled writeback deadlock Mauricio Faria de Oliveira
2020-04-23 23:36 ` [RFC PATCH 05/11] ext4: data=journal: prevent journalled writeback deadlock in __ext4_journalled_writepage() Mauricio Faria de Oliveira
2020-04-23 23:37 ` [RFC PATCH 06/11] ext4: data=journal: prevent journalled writeback deadlock in ext4_write_begin() Mauricio Faria de Oliveira
2020-04-23 23:37 ` [RFC PATCH 07/11] ext4: grab page before starting transaction handle in ext4_convert_inline_data_to_extent() Mauricio Faria de Oliveira
2020-04-23 23:37 ` Mauricio Faria de Oliveira [this message]
2020-04-23 23:37 ` [RFC PATCH 09/11] ext4: grab page before starting transaction handle in ext4_try_to_write_inline_data() Mauricio Faria de Oliveira
2020-04-23 23:37 ` [RFC PATCH 10/11] ext4: deduplicate code with error legs " Mauricio Faria de Oliveira
2020-04-23 23:37 ` [RFC PATCH 11/11] ext4: data=journal: prevent journalled writeback deadlock " Mauricio Faria de Oliveira
2020-05-15 18:39 ` [RFC PATCH 00/11] ext4: data=journal: writeback mmap'ed pagecache Mauricio Faria de Oliveira
2020-05-17 7:40 ` Andreas Dilger
2020-06-10 13:21 ` Jan Kara
2020-06-10 15:15 ` Mauricio Faria de Oliveira
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