fs: kill block_prepare_write

__block_write_begin and block_prepare_write are identical except for slightly
different calling conventions.  Convert all callers to the __block_write_begin
calling conventions and drop block_prepare_write.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 4 insertions, 5 deletions

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 6b24afb96aae..4f36f8832b9b 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -618,7 +618,6 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
         struct gfs2_alloc *al = NULL;
         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
         unsigned from = pos & (PAGE_CACHE_SIZE - 1);
-        unsigned to = from + len;
         struct page *page;
 
         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
@@ -691,7 +690,7 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
         }
 
 prepare_write:
-        error = block_prepare_write(page, from, to, gfs2_block_map);
+        error = __block_write_begin(page, from, len, gfs2_block_map);
 out:
         if (error == 0)
                 return 0;
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 0534510200d5..48a274f1674c 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -1294,7 +1294,7 @@ static int write_empty_blocks(struct page *page, unsigned from, unsigned to)
         int error;
 
         if (!page_has_buffers(page)) {
-                error = block_prepare_write(page, from, to, gfs2_block_map);
+                error = __block_write_begin(page, from, to - from, gfs2_block_map);
                 if (unlikely(error))
                         return error;
 
@@ -1313,7 +1313,7 @@ static int write_empty_blocks(struct page *page, unsigned from, unsigned to)
                 next += bh->b_size;
                 if (buffer_mapped(bh)) {
                         if (end) {
-                                error = block_prepare_write(page, start, end,
+                                error = __block_write_begin(page, start, end - start,
                                                             gfs2_block_map);
                                 if (unlikely(error))
                                         return error;
@@ -1328,7 +1328,7 @@ static int write_empty_blocks(struct page *page, unsigned from, unsigned to)
         } while (next < to);
 
         if (end) {
-                error = block_prepare_write(page, start, end, gfs2_block_map);
+                error = __block_write_begin(page, start, end - start, gfs2_block_map);
                 if (unlikely(error))
                         return error;
                 empty_write_end(page, start, end);