root/fs/gfs2/meta_io.h

INCLUDED FROM

DEFINITIONS

1. gfs2_buffer_clear
2. gfs2_buffer_clear_tail
3. gfs2_buffer_copy_tail
4. gfs2_mapping2sbd
5. gfs2_meta_inode_buffer

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  */
   6 
   7 #ifndef __DIO_DOT_H__
   8 #define __DIO_DOT_H__
   9 
  10 #include <linux/buffer_head.h>
  11 #include <linux/string.h>
  12 #include "incore.h"
  13 
  14 static inline void gfs2_buffer_clear(struct buffer_head *bh)
  15 {
  16         memset(bh->b_data, 0, bh->b_size);
  17 }
  18 
  19 static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
  20 {
  21         BUG_ON(head > bh->b_size);
  22         memset(bh->b_data + head, 0, bh->b_size - head);
  23 }
  24 
  25 static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
  26                                          int to_head,
  27                                          struct buffer_head *from_bh,
  28                                          int from_head)
  29 {
  30         BUG_ON(from_head < to_head);
  31         memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
  32                from_bh->b_size - from_head);
  33         memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
  34                0, from_head - to_head);
  35 }
  36 
  37 extern const struct address_space_operations gfs2_meta_aops;
  38 extern const struct address_space_operations gfs2_rgrp_aops;
  39 
  40 static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
  41 {
  42         struct inode *inode = mapping->host;
  43         if (mapping->a_ops == &gfs2_meta_aops)
  44                 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
  45         else if (mapping->a_ops == &gfs2_rgrp_aops)
  46                 return container_of(mapping, struct gfs2_sbd, sd_aspace);
  47         else
  48                 return inode->i_sb->s_fs_info;
  49 }
  50 
  51 extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
  52 extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
  53                           int rahead, struct buffer_head **bhp);
  54 extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
  55 extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
  56                                        int create);
  57 enum {
  58         REMOVE_JDATA = 0,
  59         REMOVE_META = 1,
  60 };
  61 
  62 extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
  63 extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
  64 extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
  65                                      struct buffer_head **bhp);
  66 
  67 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
  68                                          struct buffer_head **bhp)
  69 {
  70         return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
  71 }
  72 
  73 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
  74 
  75 #define buffer_busy(bh) \
  76 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
  77 
  78 #endif /* __DIO_DOT_H__ */
  79