/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License version 2. */ #ifndef __DIO_DOT_H__ #define __DIO_DOT_H__ #include <linux/buffer_head.h> #include <linux/string.h> #include "incore.h" static inline void gfs2_buffer_clear(struct buffer_head *bh) { memset(bh->b_data, 0, bh->b_size); } static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head) { BUG_ON(head > bh->b_size); memset(bh->b_data + head, 0, bh->b_size - head); } static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh, int to_head, struct buffer_head *from_bh, int from_head) { BUG_ON(from_head < to_head); memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head, from_bh->b_size - from_head); memset(to_bh->b_data + to_bh->b_size + to_head - from_head, 0, from_head - to_head); } extern const struct address_space_operations gfs2_meta_aops; static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping) { struct inode *inode = mapping->host; if (mapping->a_ops == &gfs2_meta_aops) return (((struct gfs2_glock *)mapping) - 1)->gl_sbd; else return inode->i_sb->s_fs_info; } void gfs2_meta_sync(struct gfs2_glock *gl); struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, struct buffer_head **bhp); int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create); void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, int meta); void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta); void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, int new, struct buffer_head **bhp); static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, struct buffer_head **bhp) { return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, 0, bhp); } struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); #define buffer_busy(bh) \ ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) #endif /* __DIO_DOT_H__ */