projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b3b94faa DT |
1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
| 3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
| b3b94faa DT |
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 | |
| e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
| b3b94faa DT |
8 | */ |
| 9 | ||
| 10 | #ifndef __DIO_DOT_H__ | |
| 11 | #define __DIO_DOT_H__ | |
| 12 | ||
| f2f7ba52 SW |
13 | #include <linux/buffer_head.h> |
| 14 | #include <linux/string.h> | |
| 15 | #include "incore.h" | |
| 16 | ||
| b3b94faa DT |
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 | { | |
| 420b9e5e | 24 | BUG_ON(head > bh->b_size); |
| b3b94faa DT |
25 | memset(bh->b_data + head, 0, bh->b_size - head); |
| 26 | } | |
| 27 | ||
| b3b94faa DT |
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 | { | |
| 420b9e5e SW |
33 | BUG_ON(from_head < to_head); |
| 34 | memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head, | |
| b3b94faa DT |
35 | from_bh->b_size - from_head); |
| 36 | memset(to_bh->b_data + to_bh->b_size + to_head - from_head, | |
| 420b9e5e | 37 | 0, from_head - to_head); |
| b3b94faa DT |
38 | } |
| 39 | ||
| 009d8518 | 40 | extern const struct address_space_operations gfs2_meta_aops; |
| 1b2ad412 | 41 | extern const struct address_space_operations gfs2_rgrp_aops; |
| 009d8518 SW |
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) | |
| 15562c43 | 47 | return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd; |
| 1b2ad412 SW |
48 | else if (mapping->a_ops == &gfs2_rgrp_aops) |
| 49 | return container_of(mapping, struct gfs2_sbd, sd_aspace); | |
| 009d8518 SW |
50 | else |
| 51 | return inode->i_sb->s_fs_info; | |
| 52 | } | |
| b3b94faa | 53 | |
| 7c0ef28a SW |
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, | |
| c8d57703 | 56 | int rahead, struct buffer_head **bhp); |
| 7c0ef28a SW |
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); | |
| b3b94faa DT |
65 | |
| 66 | static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, | |
| 67 | struct buffer_head **bhp) | |
| 68 | { | |
| f2f9c812 | 69 | return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp); |
| b3b94faa DT |
70 | } |
| 71 | ||
| 7276b3b0 | 72 | struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); |
| b3b94faa | 73 | |
| ddacfaf7 SW |
74 | #define buffer_busy(bh) \ |
| 75 | ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) | |
| ddacfaf7 | 76 | |
| b3b94faa DT |
77 | #endif /* __DIO_DOT_H__ */ |
| 78 |