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Linux/fs/gfs2/meta_io.h

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  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                 struct gfs2_glock_aspace *gla =
 45                         container_of(mapping, struct gfs2_glock_aspace, mapping);
 46                 return gla->glock.gl_name.ln_sbd;
 47         } else if (mapping->a_ops == &gfs2_rgrp_aops)
 48                 return container_of(mapping, struct gfs2_sbd, sd_aspace);
 49         else
 50                 return inode->i_sb->s_fs_info;
 51 }
 52 
 53 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
 54 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
 55                    int rahead, struct buffer_head **bhp);
 56 int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
 57 struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
 58                                 int create);
 59 enum {
 60         REMOVE_JDATA = 0,
 61         REMOVE_META = 1,
 62 };
 63 
 64 void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
 65 void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
 66 int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
 67                      struct buffer_head **bhp);
 68 
 69 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
 70                                          struct buffer_head **bhp)
 71 {
 72         return gfs2_meta_buffer(ip, GFS2_METATYPE_DI, ip->i_no_addr, bhp);
 73 }
 74 
 75 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
 76 
 77 #define buffer_busy(bh) \
 78 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
 79 
 80 #endif /* __DIO_DOT_H__ */
 81 
 82 

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