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-rw-r--r--fs/gfs2/ops_address.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 2b556dd034b..e64a1b04117 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -499,31 +499,34 @@ static int __gfs2_readpage(void *file, struct page *page)
* @file: The file to read
* @page: The page of the file
*
- * This deals with the locking required. We use a trylock in order to
- * avoid the page lock / glock ordering problems returning AOP_TRUNCATED_PAGE
- * in the event that we are unable to get the lock.
+ * This deals with the locking required. We have to unlock and
+ * relock the page in order to get the locking in the right
+ * order.
*/
static int gfs2_readpage(struct file *file, struct page *page)
{
- struct gfs2_inode *ip = GFS2_I(page->mapping->host);
+ struct address_space *mapping = page->mapping;
+ struct gfs2_inode *ip = GFS2_I(mapping->host);
struct gfs2_holder gh;
int error;
- gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
+ unlock_page(page);
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
error = gfs2_glock_nq_atime(&gh);
- if (unlikely(error)) {
- unlock_page(page);
+ if (unlikely(error))
goto out;
- }
- error = __gfs2_readpage(file, page);
+ error = AOP_TRUNCATED_PAGE;
+ lock_page(page);
+ if (page->mapping == mapping && !PageUptodate(page))
+ error = __gfs2_readpage(file, page);
+ else
+ unlock_page(page);
gfs2_glock_dq(&gh);
out:
gfs2_holder_uninit(&gh);
- if (error == GLR_TRYFAILED) {
- yield();
- return AOP_TRUNCATED_PAGE;
- }
+ if (error && error != AOP_TRUNCATED_PAGE)
+ lock_page(page);
return error;
}