ocfs2: move nonsparse hole-filling into ocfs2_write_begin()

By doing this, we can remove any higher level logic which has to have
knowledge of btree functionality - any callers of ocfs2_write_begin() can
now expect it to do anything necessary to prepare the inode for new data.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Reviewed-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 36 insertions, 4 deletions

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index f37f25c931f5..fae07672eb18 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -301,12 +301,8 @@ int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
 {
         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;
 }
 
@@ -1360,6 +1356,36 @@ out:
         return ret;
 }
 
+/*
+ * This function only does anything for file systems which can't
+ * handle sparse files.
+ *
+ * What we want to do here is fill in any hole between the current end
+ * of allocation and the end of our write. That way the rest of the
+ * write path can treat it as an non-allocating write, which has no
+ * special case code for sparse/nonsparse files.
+ */
+static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos,
+                                        unsigned len,
+                                        struct ocfs2_write_ctxt *wc)
+{
+        int ret;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        loff_t newsize = pos + len;
+
+        if (ocfs2_sparse_alloc(osb))
+                return 0;
+
+        if (newsize <= i_size_read(inode))
+                return 0;
+
+        ret = ocfs2_extend_no_holes(inode, newsize, newsize - len);
+        if (ret)
+                mlog_errno(ret);
+
+        return ret;
+}
+
 int ocfs2_write_begin_nolock(struct address_space *mapping,
                              loff_t pos, unsigned len, unsigned flags,
                              struct page **pagep, void **fsdata,
@@ -1381,6 +1407,12 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
                 return ret;
         }
 
+        ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
         ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
                                         &extents_to_split);
         if (ret) {