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 struct gfs2_glock_aspace *gla = 45 container_of(mapping, struct gfs2_glock_aspace, mapping); 46 return gla->glock.gl_name.ln_sbd; 47 } else if (mapping->a_ops == &gfs2_rgrp_aops) 48 return container_of(mapping, struct gfs2_sbd, sd_aspace); 49 else 50 return inode->i_sb->s_fs_info; 51 } 52 53 struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); 54 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, 55 int rahead, struct buffer_head **bhp); 56 int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); 57 struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, 58 int create); 59 enum { 60 REMOVE_JDATA = 0, 61 REMOVE_META = 1, 62 }; 63 64 void gfs2_remove_from_journal(struct buffer_head *bh, int meta); 65 void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); 66 int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num, 67 struct buffer_head **bhp); 68 69 static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, 70 struct buffer_head **bhp) 71 { 72 return gfs2_meta_buffer(ip, GFS2_METATYPE_DI, ip->i_no_addr, bhp); 73 } 74 75 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); 76 77 #define buffer_busy(bh) \ 78 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) 79 80 #endif /* __DIO_DOT_H__ */ 81 82