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Date: Wed, 5 Jun 2019 18:45:40 -0700
From: ira.weiny@...el.com
To: Dan Williams <dan.j.williams@...el.com>, Jan Kara <jack@...e.cz>,
"Theodore Ts'o" <tytso@....edu>, Jeff Layton <jlayton@...nel.org>,
Dave Chinner <david@...morbit.com>
Cc: Ira Weiny <ira.weiny@...el.com>,
Matthew Wilcox <willy@...radead.org>,
linux-xfs@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
John Hubbard <jhubbard@...dia.com>,
Jérôme Glisse <jglisse@...hat.com>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-nvdimm@...ts.01.org, linux-ext4@...r.kernel.org,
linux-mm@...ck.org
Subject: [PATCH RFC 07/10] fs/ext4: Fail truncate if pages are GUP pinned
From: Ira Weiny <ira.weiny@...el.com>
If pages are actively gup pinned fail the truncate operation.
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
fs/ext4/inode.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 75f543f384e4..1ded83ec08c0 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4250,6 +4250,9 @@ int ext4_break_layouts(struct inode *inode, loff_t offset, loff_t len)
if (!page)
return 0;
+ if (page_gup_pinned(page))
+ return -ETXTBSY;
+
error = ___wait_var_event(&page->_refcount,
atomic_read(&page->_refcount) == 1,
TASK_INTERRUPTIBLE, 0, 0,
--
2.20.1
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