1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7 #ifndef __DIO_DOT_H__ 8 #define __DIO_DOT_H__ 9 10 #include <linux/buffer_head.h> 11 #include <linux/string.h> 12 #include "incore.h" 13 14 static inline void gfs2_buffer_clear(struct buffer_head *bh) 15 { 16 memset(bh->b_data, 0, bh->b_size); 17 } 18 19 static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head) 20 { 21 BUG_ON(head > bh->b_size); 22 memset(bh->b_data + head, 0, bh->b_size - head); 23 } 24 25 static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh, 26 int to_head, 27 struct buffer_head *from_bh, 28 int from_head) 29 { 30 BUG_ON(from_head < to_head); 31 memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head, 32 from_bh->b_size - from_head); 33 memset(to_bh->b_data + to_bh->b_size + to_head - from_head, 34 0, from_head - to_head); 35 } 36 37 extern const struct address_space_operations gfs2_meta_aops; 38 extern const struct address_space_operations gfs2_rgrp_aops; 39 40 static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping) 41 { 42 struct inode *inode = mapping->host; 43 if (mapping->a_ops == &gfs2_meta_aops) 44 return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd; 45 else if (mapping->a_ops == &gfs2_rgrp_aops) 46 return container_of(mapping, struct gfs2_sbd, sd_aspace); 47 else 48 return inode->i_sb->s_fs_info; 49 } 50 51 extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); 52 extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, 53 int rahead, struct buffer_head **bhp); 54 extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); 55 extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, 56 int create); 57 enum { 58 REMOVE_JDATA = 0, 59 REMOVE_META = 1, 60 }; 61 62 extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta); 63 extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); 64 extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, 65 struct buffer_head **bhp); 66 67 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, 68 struct buffer_head **bhp) 69 { 70 return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp); 71 } 72 73 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); 74 75 #define buffer_busy(bh) \ 76 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) 77 78 #endif /* __DIO_DOT_H__ */ 79 80