ocfs2: take data locks around extend

We need to take a data lock around extends to protect the pages that
ocfs2_zero_extend is going to be pulling into the page cache. Otherwise an
extend on one node might populate the page cache with data pages that have
no lock coverage.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 39 insertions, 7 deletions

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 0d858d0b25be..47152bf9a7f2 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -276,13 +276,29 @@ static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
         return ret;
 }
 
+/* This can also be called from ocfs2_write_zero_page() which has done
+ * it's own cluster locking. */
+int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
+                               unsigned from, unsigned to)
+{
+        int ret;
+
+        down_read(&OCFS2_I(inode)->ip_alloc_sem);
+
+        ret = block_prepare_write(page, from, to, ocfs2_get_block);
+
+        up_read(&OCFS2_I(inode)->ip_alloc_sem);
+
+        return ret;
+}
+
 /*
  * ocfs2_prepare_write() can be an outer-most ocfs2 call when it is called
  * from loopback.  It must be able to perform its own locking around
  * ocfs2_get_block().
  */
-int ocfs2_prepare_write(struct file *file, struct page *page,
-                        unsigned from, unsigned to)
+static int ocfs2_prepare_write(struct file *file, struct page *page,
+                               unsigned from, unsigned to)
 {
         struct inode *inode = page->mapping->host;
         int ret;
@@ -295,11 +311,7 @@ int ocfs2_prepare_write(struct file *file, struct page *page,
                 goto out;
         }
 
-        down_read(&OCFS2_I(inode)->ip_alloc_sem);
-
-        ret = block_prepare_write(page, from, to, ocfs2_get_block);
-
-        up_read(&OCFS2_I(inode)->ip_alloc_sem);
+        ret = ocfs2_prepare_write_nolock(inode, page, from, to);
 
         ocfs2_meta_unlock(inode, 0);
 out:
@@ -625,11 +637,31 @@ static ssize_t ocfs2_direct_IO(int rw,
         int ret;
 
         mlog_entry_void();
+
+        /*
+         * We get PR data locks even for O_DIRECT.  This allows
+         * concurrent O_DIRECT I/O but doesn't let O_DIRECT with
+         * extending and buffered zeroing writes race.  If they did
+         * race then the buffered zeroing could be written back after
+         * the O_DIRECT I/O.  It's one thing to tell people not to mix
+         * buffered and O_DIRECT writes, but expecting them to
+         * understand that file extension is also an implicit buffered
+         * write is too much.  By getting the PR we force writeback of
+         * the buffered zeroing before proceeding.
+         */
+        ret = ocfs2_data_lock(inode, 0);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+        ocfs2_data_unlock(inode, 0);
+
         ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
                                             inode->i_sb->s_bdev, iov, offset,
                                             nr_segs, 
                                             ocfs2_direct_IO_get_blocks,
                                             ocfs2_dio_end_io);
+out:
         mlog_exit(ret);
         return ret;
 }