From: Matthew Wilcox <willy@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Johannes Thumshirn <jthumshirn@suse.de>,
linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org,
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Toshi Kani <toshi.kani@hpe.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH] Fix mpage_writepage() for pages with buffers
Date: Fri, 6 Oct 2017 14:15:41 -0700 [thread overview]
Message-ID: <20171006211541.GA7409@bombadil.infradead.org> (raw)
When using FAT on a block device which supports rw_page, we can hit
BUG_ON(!PageLocked(page)) in try_to_free_buffers(). This is because we
call clean_buffers() after unlocking the page we've written. Introduce a
new clean_page_buffers() which cleans all buffers associated with a page
and call it from within bdev_write_page().
Reported-by: Toshi Kani <toshi.kani@hpe.com>
Reported-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Tested-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: stable@vger.kernel.org
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 9941dc8342df..3fbe75bdd257 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -716,10 +716,12 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
set_page_writeback(page);
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, true);
- if (result)
+ if (result) {
end_page_writeback(page);
- else
+ } else {
+ clean_page_buffers(page);
unlock_page(page);
+ }
blk_queue_exit(bdev->bd_queue);
return result;
}
diff --git a/fs/mpage.c b/fs/mpage.c
index 2e4c41ccb5c9..d97b003f1607 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -468,6 +468,16 @@ static void clean_buffers(struct page *page, unsigned first_unmapped)
try_to_free_buffers(page);
}
+/*
+ * For situations where we want to clean all buffers attached to a page.
+ * We don't need to calculate how many buffers are attached to the page,
+ * we just need to specify a number larger than the maximum number of buffers.
+ */
+void clean_page_buffers(struct page *page)
+{
+ clean_buffers(page, PAGE_SIZE);
+}
+
static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data)
{
@@ -605,10 +615,8 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
if (bio == NULL) {
if (first_unmapped == blocks_per_page) {
if (!bdev_write_page(bdev, blocks[0] << (blkbits - 9),
- page, wbc)) {
- clean_buffers(page, first_unmapped);
+ page, wbc))
goto out;
- }
}
bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9),
BIO_MAX_PAGES, GFP_NOFS|__GFP_HIGH);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index c8dae555eccf..446b24cac67d 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -232,6 +232,7 @@ int generic_write_end(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
struct page *, void *);
void page_zero_new_buffers(struct page *page, unsigned from, unsigned to);
+void clean_page_buffers(struct page *page);
int cont_write_begin(struct file *, struct address_space *, loff_t,
unsigned, unsigned, struct page **, void **,
get_block_t *, loff_t *);
next reply other threads:[~2017-10-06 21:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-06 21:15 Matthew Wilcox [this message]
2017-10-09 10:41 ` [PATCH] Fix mpage_writepage() for pages with buffers Johannes Thumshirn
2017-10-10 19:44 ` Andrew Morton
2017-10-10 20:31 ` Linus Torvalds
2017-10-11 15:40 ` Matthew Wilcox
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