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TOMOYO Linux Cross Reference
Linux/fs/gfs2/meta_io.h

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  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 extern const struct address_space_operations gfs2_meta_aops;
 41 extern const struct address_space_operations gfs2_rgrp_aops;
 42 
 43 static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
 44 {
 45         struct inode *inode = mapping->host;
 46         if (mapping->a_ops == &gfs2_meta_aops)
 47                 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
 48         else if (mapping->a_ops == &gfs2_rgrp_aops)
 49                 return container_of(mapping, struct gfs2_sbd, sd_aspace);
 50         else
 51                 return inode->i_sb->s_fs_info;
 52 }
 53 
 54 extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
 55 extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
 56                           int rahead, struct buffer_head **bhp);
 57 extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
 58 extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
 59                                        int create);
 60 enum {
 61         REMOVE_JDATA = 0,
 62         REMOVE_META = 1,
 63 };
 64 
 65 extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
 66 extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
 67 extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
 68                                      struct buffer_head **bhp);
 69 
 70 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
 71                                          struct buffer_head **bhp)
 72 {
 73         return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
 74 }
 75 
 76 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);
 77 
 78 #define buffer_busy(bh) \
 79 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
 80 
 81 #endif /* __DIO_DOT_H__ */
 82 
 83 

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