release/src-rt-6.x/linux/linux-2.6/fs/gfs2/meta_io.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #ifndef __DIO_DOT_H__
  11 #define __DIO_DOT_H__
  12
  13 #include <linux/buffer_head.h>
  14 #include <linux/string.h>
  15 #include "incore.h"
  16
  17 static inline void gfs2_buffer_clear(struct buffer_head *bh)
  18 {
  19         memset(bh->b_data, 0, bh->b_size);
  20 }
  21
  22 static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
  23 {
  24         BUG_ON(head > bh->b_size);
  25         memset(bh->b_data + head, 0, bh->b_size - head);
  26 }
  27
  28 static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
  29                                          int to_head,
  30                                          struct buffer_head *from_bh,
  31                                          int from_head)
  32 {
  33         BUG_ON(from_head < to_head);
  34         memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
  35                from_bh->b_size - from_head);
  36         memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
  37                0, from_head - to_head);
  38 }
  39
  40 struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp);
  41 void gfs2_aspace_put(struct inode *aspace);
  42
  43 void gfs2_meta_inval(struct gfs2_glock *gl);
  44 void gfs2_meta_sync(struct gfs2_glock *gl);
  45
  46 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
  47 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno,
  48                    int flags, struct buffer_head **bhp);
  49 int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
  50
  51 void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
  52                          int meta);
  53 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
  54 void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
  55                 struct gfs2_ail *ai);
  56
  57 void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
  58
  59 void gfs2_meta_cache_flush(struct gfs2_inode *ip);
  60 int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
  61                               int new, struct buffer_head **bhp);
  62
  63 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
  64                                          struct buffer_head **bhp)
  65 {
  66         return gfs2_meta_indirect_buffer(ip, 0, ip->i_num.no_addr, 0, bhp);
  67 }
  68
  69 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
  70
  71 #define buffer_busy(bh) \
  72 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
  73 #define buffer_in_io(bh) \
  74 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
  75
  76 #endif /* __DIO_DOT_H__ */
  77