iomap: Fix unsharing of an extent >2GB on a 32-bit machine

Matthew Wilcox (Oracle) · djwong · commit d4ff3b2ef901 · 2020-06-08T20:58:29.000-07:00
Widen the type used for counting the number of bytes unshared.

Signed-off-by: Matthew Wilcox (Oracle) &lt;willy@infradead.org&gt;
Reviewed-by: Christoph Hellwig &lt;hch@lst.de&gt;
Reviewed-by: Darrick J. Wong &lt;darrick.wong@oracle.com&gt;
Signed-off-by: Darrick J. Wong &lt;darrick.wong@oracle.com&gt;
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
@@ -909,7 +909,7 @@ iomap_unshare_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 		struct iomap *iomap, struct iomap *srcmap)
 {
 	long status = 0;
-	ssize_t written = 0;
+	loff_t written = 0;
 
 	/* don't bother with blocks that are not shared to start with */
 	if (!(iomap->flags & IOMAP_F_SHARED))

Original file line number	Diff line number	Diff line change
`@@ -909,7 +909,7 @@ iomap_unshare_actor(struct inode inode, loff_t pos, loff_t length, void data,`
`909`	`909`	`struct iomap iomap, struct iomap srcmap)`
`910`	`910`	`{`
`911`	`911`	`long status = 0;`
`912`		`- ssize_t written = 0;`
	`912`	`+ loff_t written = 0;`
`913`	`913`
`914`	`914`	`/* don't bother with blocks that are not shared to start with */`
`915`	`915`	`if (!(iomap->flags & IOMAP_F_SHARED))`