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 struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp); 41 void gfs2_aspace_put(struct inode *aspace); 42 43 void gfs2_meta_inval(struct gfs2_glock *gl); 44 void gfs2_meta_sync(struct gfs2_glock *gl); 45 46 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); 47 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, 48 int flags, struct buffer_head **bhp); 49 int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); 50 51 void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, 52 int meta); 53 54 void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); 55 56 void gfs2_meta_cache_flush(struct gfs2_inode *ip); 57 int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, 58 int new, struct buffer_head **bhp); 59 60 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, 61 struct buffer_head **bhp) 62 { 63 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, 0, bhp); 64 } 65 66 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); 67 68 #define buffer_busy(bh) \ 69 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) 70 #define buffer_in_io(bh) \ 71 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock))) 72 73 #endif /* __DIO_DOT_H__ */ 74 75