LXR linux/fs/gfs2/meta

   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
  14static inline void gfs2_buffer_clear(struct buffer_head *bh)
  15{
  16        memset(bh->b_data, 0, bh->b_size);
  17}
  18
  19static 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
  25static 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
  37extern const struct address_space_operations gfs2_meta_aops;
  38extern const struct address_space_operations gfs2_rgrp_aops;
  39
  40static 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
  51extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
  52extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
  53                          int rahead, struct buffer_head **bhp);
  54extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
  55extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
  56                                       int create);
  57enum {
  58        REMOVE_JDATA = 0,
  59        REMOVE_META = 1,
  60};
  61
  62extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
  63extern void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
  64extern int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
  65                            struct buffer_head **bhp);
  66
  67static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
  68                                         struct buffer_head **bhp)
  69{
  70        return gfs2_meta_buffer(ip, GFS2_METATYPE_DI, ip->i_no_addr, bhp);
  71}
  72
  73struct 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
  80