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authorMark Fasheh <mark.fasheh@oracle.com>2007-02-09 20:24:12 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2007-04-26 15:02:08 -0700
commit9517bac6cc7a7aa4fee63cb38a32cb6014e264c7 (patch)
tree3cac0c18d0cacc316e0e8a60f483282d6f991779 /fs/ocfs2/aops.h
parent89488984ac23b0580f959b9ee549f2fcb1c2f194 (diff)
downloadop-kernel-dev-9517bac6cc7a7aa4fee63cb38a32cb6014e264c7.zip
op-kernel-dev-9517bac6cc7a7aa4fee63cb38a32cb6014e264c7.tar.gz
ocfs2: teach ocfs2_file_aio_write() about sparse files
Unfortunately, ocfs2 can no longer make use of generic_file_aio_write_nlock() because allocating writes will require zeroing of pages adjacent to the I/O for cluster sizes greater than page size. Implement a custom file write here, which can order page locks for zeroing. This also has the advantage that cluster locks can easily be ordered outside of the page locks. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/aops.h')
-rw-r--r--fs/ocfs2/aops.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h
index f446a15..eeb2c42 100644
--- a/fs/ocfs2/aops.h
+++ b/fs/ocfs2/aops.h
@@ -30,6 +30,44 @@ handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
unsigned from,
unsigned to);
+struct ocfs2_write_ctxt;
+typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
+ u64 *, unsigned int *, unsigned int *);
+
+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);
+
/* all ocfs2_dio_end_io()'s fault */
#define ocfs2_iocb_is_rw_locked(iocb) \
test_bit(0, (unsigned long *)&iocb->private)
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