1b3b94faaSDavid Teigland /* 2b3b94faaSDavid Teigland * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 33a8a9a10SSteven Whitehouse * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4b3b94faaSDavid Teigland * 5b3b94faaSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 6b3b94faaSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 7e9fc2aa0SSteven Whitehouse * of the GNU General Public License version 2. 8b3b94faaSDavid Teigland */ 9b3b94faaSDavid Teigland 10b3b94faaSDavid Teigland #ifndef __DIO_DOT_H__ 11b3b94faaSDavid Teigland #define __DIO_DOT_H__ 12b3b94faaSDavid Teigland 13f2f7ba52SSteven Whitehouse #include <linux/buffer_head.h> 14f2f7ba52SSteven Whitehouse #include <linux/string.h> 15f2f7ba52SSteven Whitehouse #include "incore.h" 16f2f7ba52SSteven Whitehouse 17b3b94faaSDavid Teigland static inline void gfs2_buffer_clear(struct buffer_head *bh) 18b3b94faaSDavid Teigland { 19b3b94faaSDavid Teigland memset(bh->b_data, 0, bh->b_size); 20b3b94faaSDavid Teigland } 21b3b94faaSDavid Teigland 22b3b94faaSDavid Teigland static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head) 23b3b94faaSDavid Teigland { 24420b9e5eSSteven Whitehouse BUG_ON(head > bh->b_size); 25b3b94faaSDavid Teigland memset(bh->b_data + head, 0, bh->b_size - head); 26b3b94faaSDavid Teigland } 27b3b94faaSDavid Teigland 28b3b94faaSDavid Teigland static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh, 29b3b94faaSDavid Teigland int to_head, 30b3b94faaSDavid Teigland struct buffer_head *from_bh, 31b3b94faaSDavid Teigland int from_head) 32b3b94faaSDavid Teigland { 33420b9e5eSSteven Whitehouse BUG_ON(from_head < to_head); 34420b9e5eSSteven Whitehouse memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head, 35b3b94faaSDavid Teigland from_bh->b_size - from_head); 36b3b94faaSDavid Teigland memset(to_bh->b_data + to_bh->b_size + to_head - from_head, 37420b9e5eSSteven Whitehouse 0, from_head - to_head); 38b3b94faaSDavid Teigland } 39b3b94faaSDavid Teigland 40009d8518SSteven Whitehouse extern const struct address_space_operations gfs2_meta_aops; 411b2ad412SSteven Whitehouse extern const struct address_space_operations gfs2_rgrp_aops; 42009d8518SSteven Whitehouse 43009d8518SSteven Whitehouse static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping) 44009d8518SSteven Whitehouse { 45009d8518SSteven Whitehouse struct inode *inode = mapping->host; 46009d8518SSteven Whitehouse if (mapping->a_ops == &gfs2_meta_aops) 47009d8518SSteven Whitehouse return (((struct gfs2_glock *)mapping) - 1)->gl_sbd; 481b2ad412SSteven Whitehouse else if (mapping->a_ops == &gfs2_rgrp_aops) 491b2ad412SSteven Whitehouse return container_of(mapping, struct gfs2_sbd, sd_aspace); 50009d8518SSteven Whitehouse else 51009d8518SSteven Whitehouse return inode->i_sb->s_fs_info; 52009d8518SSteven Whitehouse } 53b3b94faaSDavid Teigland 547c0ef28aSSteven Whitehouse extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); 557c0ef28aSSteven Whitehouse extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, 567c0ef28aSSteven Whitehouse struct buffer_head **bhp); 577c0ef28aSSteven Whitehouse extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); 587c0ef28aSSteven Whitehouse extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, 597c0ef28aSSteven Whitehouse int create); 607c0ef28aSSteven Whitehouse extern void gfs2_remove_from_journal(struct buffer_head *bh, 617c0ef28aSSteven Whitehouse struct gfs2_trans *tr, int meta); 627c0ef28aSSteven Whitehouse extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); 637c0ef28aSSteven Whitehouse extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, 64f2f9c812SBob Peterson struct buffer_head **bhp); 65b3b94faaSDavid Teigland 66b3b94faaSDavid Teigland static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, 67b3b94faaSDavid Teigland struct buffer_head **bhp) 68b3b94faaSDavid Teigland { 69f2f9c812SBob Peterson return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp); 70b3b94faaSDavid Teigland } 71b3b94faaSDavid Teigland 727276b3b0SSteven Whitehouse struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); 73b3b94faaSDavid Teigland 74ddacfaf7SSteven Whitehouse #define buffer_busy(bh) \ 75ddacfaf7SSteven Whitehouse ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) 76ddacfaf7SSteven Whitehouse 77b3b94faaSDavid Teigland #endif /* __DIO_DOT_H__ */ 78b3b94faaSDavid Teigland 79