ocfs2: rework ocfs2_buffered_write_cluster()

Use some ideas from the new-aops patch series and turn
ocfs2_buffered_write_cluster() into a 2 stage operation with the caller
copying data in between. The code now understands multiple cluster writes as
a result of having to deal with a full page write for greater than 4k pages.

This sets us up to easily call into the write path during ->page_mkwrite().

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

1 files changed, 6 insertions, 50 deletions

diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h
index 45821d479b5a..bdcdd1ae63a9 100644
--- a/fs/ocfs2/aops.h
+++ b/fs/ocfs2/aops.h
@@ -42,57 +42,13 @@ int walk_page_buffers(	handle_t *handle,
                         int (*fn)(      handle_t *handle,
                                         struct buffer_head *bh));
 
-struct ocfs2_write_ctxt;
-typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
-                                u64 *, unsigned int *, unsigned int *);
+int ocfs2_write_begin(struct file *file, struct address_space *mapping,
+                      loff_t pos, unsigned len, unsigned flags,
+                      struct page **pagep, void **fsdata);
 
-ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
-                                     size_t count, ocfs2_page_writer *actor,
-                                     void *priv);
-
-struct ocfs2_write_ctxt {
-        size_t                          w_count;
-        loff_t                          w_pos;
-        u32                             w_cpos;
-        unsigned int                    w_finished_copy;
-
-        /* This is true if page_size > cluster_size */
-        unsigned int                    w_large_pages;
-
-        /* Filler callback and private data */
-        ocfs2_page_writer               *w_write_data_page;
-        void                            *w_private;
-
-        /* Only valid for the filler callback */
-        struct page                     *w_this_page;
-        unsigned int                    w_this_page_new;
-};
-
-struct ocfs2_buffered_write_priv {
-        char                            *b_src_buf;
-        const struct iovec              *b_cur_iov; /* Current iovec */
-        size_t                          b_cur_off; /* Offset in the
-                                                    * current iovec */
-};
-int ocfs2_map_and_write_user_data(struct inode *inode,
-                                  struct ocfs2_write_ctxt *wc,
-                                  u64 *p_blkno,
-                                  unsigned int *ret_from,
-                                  unsigned int *ret_to);
-
-struct ocfs2_splice_write_priv {
-        struct splice_desc              *s_sd;
-        struct pipe_buffer              *s_buf;
-        struct pipe_inode_info          *s_pipe;
-        /* Neither offset value is ever larger than one page */
-        unsigned int                    s_offset;
-        unsigned int                    s_buf_offset;
-};
-int ocfs2_map_and_write_splice_data(struct inode *inode,
-                                    struct ocfs2_write_ctxt *wc,
-                                    u64 *p_blkno,
-                                    unsigned int *ret_from,
-                                    unsigned int *ret_to);
+int ocfs2_write_end(struct file *file, struct address_space *mapping,
+                    loff_t pos, unsigned len, unsigned copied,
+                    struct page *page, void *fsdata);
 
 /* all ocfs2_dio_end_io()'s fault */
 #define ocfs2_iocb_is_rw_locked(iocb) \