[v5,1/2] block: invalidate the page cache when issuing BLKZEROOUT.

Commit Message

Darrick J. Wong Dec. 8, 2015, 6:21 a.m. UTC

Invalidate the page cache (as a regular O_DIRECT write would do) to avoid
returning stale cache contents at a later time.

v5: Refactor the 4.4 refactoring of the ioctl code into separate functions.
Split the page invalidation and the new ioctl into separate patches.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 block/ioctl.c |   29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)



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Comments

Martin K. Petersen Dec. 10, 2015, 5:37 p.m. UTC | #1

>>>>> "Darrick" == Darrick J Wong <[e-mail]> writes:

Darrick> Invalidate the page cache (as a regular O_DIRECT write would
Darrick> do) to avoid returning stale cache contents at a later time.

Reviewed-by: Martin K. Petersen <[e-mail]>

Christoph Hellwig Dec. 14, 2015, 4:32 p.m. UTC | #2

Looks fine,

Reviewed-by: Christoph Hellwig <[e-mail]>
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Seymour, Shane M Dec. 15, 2015, 12:04 a.m. UTC | #3

Thank you for taking the issues I raised about converting
unsigned to signed into account.

Reviewed-by: Shane Seymour <[e-mail]>

Patch

diff --git a/block/ioctl.c b/block/ioctl.c
index 0918aed..d06646d 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -225,7 +225,9 @@  static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
 		unsigned long arg)
 {
 	uint64_t range[2];
-	uint64_t start, len;
+	struct address_space *mapping;
+	uint64_t start, end, len;
+	int ret;
 
 	if (!(mode & FMODE_WRITE))
 		return -EBADF;
@@ -235,18 +237,33 @@  static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
 
 	start = range[0];
 	len = range[1];
+	end = start + len - 1;
 
 	if (start & 511)
 		return -EINVAL;
 	if (len & 511)
 		return -EINVAL;
-	start >>= 9;
-	len >>= 9;
-
-	if (start + len > (i_size_read(bdev->bd_inode) >> 9))
+	if (end >= (uint64_t)i_size_read(bdev->bd_inode))
+		return -EINVAL;
+	if (end < start)
 		return -EINVAL;
 
-	return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL, false);
+	/* Invalidate the page cache, including dirty pages */
+	mapping = bdev->bd_inode->i_mapping;
+	truncate_inode_pages_range(mapping, start, end);
+
+	ret = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
+				    false);
+	if (ret)
+		return ret;
+
+	/*
+	 * Invalidate again; if someone wandered in and dirtied a page,
+	 * the caller will be given -EBUSY.
+	 */
+	return invalidate_inode_pages2_range(mapping,
+					     start >> PAGE_CACHE_SHIFT,
+					     end >> PAGE_CACHE_SHIFT);
 }
 
 static int put_ushort(unsigned long arg, unsigned short val)