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 v.2.
   8  */
   9
  10 #ifndef __DIO_DOT_H__
  11 #define __DIO_DOT_H__
  12
  13 static inline void gfs2_buffer_clear(struct buffer_head *bh)
  14 {
  15         memset(bh->b_data, 0, bh->b_size);
  16 }
  17
  18 static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
  19 {
  20         memset(bh->b_data + head, 0, bh->b_size - head);
  21 }
  22
  23 static inline void gfs2_buffer_clear_ends(struct buffer_head *bh, int offset,
  24                                           int amount, int journaled)
  25 {
  26         int z_off1 = (journaled) ? sizeof(struct gfs2_meta_header) : 0;
  27         int z_len1 = offset - z_off1;
  28         int z_off2 = offset + amount;
  29         int z_len2 = (bh)->b_size - z_off2;
  30
  31         if (z_len1)
  32                 memset(bh->b_data + z_off1, 0, z_len1);
  33
  34         if (z_len2)
  35                 memset(bh->b_data + z_off2, 0, z_len2);
  36 }
  37
  38 static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
  39                                          int to_head,
  40                                          struct buffer_head *from_bh,
  41                                          int from_head)
  42 {
  43         memcpy(to_bh->b_data + to_head,
  44                from_bh->b_data + from_head,
  45                from_bh->b_size - from_head);
  46         memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
  47                0,
  48                from_head - to_head);
  49 }
  50
  51 struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp);
  52 void gfs2_aspace_put(struct inode *aspace);
  53
  54 void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  55 int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags);
  56 void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  57 void gfs2_ail_empty_gl(struct gfs2_glock *gl);
  58
  59 void gfs2_meta_inval(struct gfs2_glock *gl);
  60 void gfs2_meta_sync(struct gfs2_glock *gl, int flags);
  61
  62 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, uint64_t blkno);
  63 int gfs2_meta_read(struct gfs2_glock *gl, uint64_t blkno,
  64                    int flags, struct buffer_head **bhp);
  65 int gfs2_meta_reread(struct gfs2_sbd *sdp, struct buffer_head *bh, int flags);
  66
  67 void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
  68                          int meta);
  69 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
  70 void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
  71                 struct gfs2_ail *ai);
  72
  73 void gfs2_meta_wipe(struct gfs2_inode *ip, uint64_t bstart, uint32_t blen);
  74
  75 void gfs2_meta_cache_flush(struct gfs2_inode *ip);
  76 int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, uint64_t num,
  77                               int new, struct buffer_head **bhp);
  78
  79 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
  80                                          struct buffer_head **bhp)
  81 {
  82         return gfs2_meta_indirect_buffer(ip, 0, ip->i_num.no_addr, 0, bhp);
  83 }
  84
  85 void gfs2_meta_ra(struct gfs2_glock *gl, uint64_t dblock, uint32_t extlen);
  86 void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
  87
  88 #endif /* __DIO_DOT_H__ */
  89