Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / gfs2 / meta_io.h

diff --git a/kernel/fs/gfs2/meta_io.h b/kernel/fs/gfs2/meta_io.h
new file mode 100644 (file)
index 0000000..ac5d802
--- /dev/null
+++ b/kernel/fs/gfs2/meta_io.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#ifndef __DIO_DOT_H__
+#define __DIO_DOT_H__
+
+#include <linux/buffer_head.h>
+#include <linux/string.h>
+#include "incore.h"
+
+static inline void gfs2_buffer_clear(struct buffer_head *bh)
+{
+       memset(bh->b_data, 0, bh->b_size);
+}
+
+static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
+{
+       BUG_ON(head > bh->b_size);
+       memset(bh->b_data + head, 0, bh->b_size - head);
+}
+
+static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
+                                        int to_head,
+                                        struct buffer_head *from_bh,
+                                        int from_head)
+{
+       BUG_ON(from_head < to_head);
+       memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
+              from_bh->b_size - from_head);
+       memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
+              0, from_head - to_head);
+}
+
+extern const struct address_space_operations gfs2_meta_aops;
+extern const struct address_space_operations gfs2_rgrp_aops;
+
+static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
+{
+       struct inode *inode = mapping->host;
+       if (mapping->a_ops == &gfs2_meta_aops)
+               return (((struct gfs2_glock *)mapping) - 1)->gl_sbd;
+       else if (mapping->a_ops == &gfs2_rgrp_aops)
+               return container_of(mapping, struct gfs2_sbd, sd_aspace);
+       else
+               return inode->i_sb->s_fs_info;
+}
+
+extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
+extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
+                         struct buffer_head **bhp);
+extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
+extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
+                                      int create);
+extern void gfs2_remove_from_journal(struct buffer_head *bh,
+                                    struct gfs2_trans *tr, int meta);
+extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
+extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
+                                    struct buffer_head **bhp);
+
+static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
+                                        struct buffer_head **bhp)
+{
+       return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
+}
+
+struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
+
+#define buffer_busy(bh) \
+((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
+
+#endif /* __DIO_DOT_H__ */
+