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_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 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 extern void gfs2_remove_from_journal(struct buffer_head *bh, 61 struct gfs2_trans *tr, int meta); 62 extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); 63 extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, 64 struct buffer_head **bhp); 65 66 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, 67 struct buffer_head **bhp) 68 { 69 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp); 70 } 71 72 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); 73 74 #define buffer_busy(bh) \ 75 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) 76 77 #endif /* __DIO_DOT_H__ */ 78 79