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fs/gfs2/meta_io.h
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/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
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*/ #ifndef __DIO_DOT_H__ #define __DIO_DOT_H__ |
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#include <linux/buffer_head.h> #include <linux/string.h> #include "incore.h" |
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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) { |
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BUG_ON(head > bh->b_size); |
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memset(bh->b_data + head, 0, bh->b_size - head); } |
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static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh, int to_head, struct buffer_head *from_bh, int from_head) { |
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BUG_ON(from_head < to_head); memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head, |
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from_bh->b_size - from_head); memset(to_bh->b_data + to_bh->b_size + to_head - from_head, |
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0, from_head - to_head); |
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} |
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extern const struct address_space_operations gfs2_meta_aops; |
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extern const struct address_space_operations gfs2_rgrp_aops; |
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static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping) { struct inode *inode = mapping->host; if (mapping->a_ops == &gfs2_meta_aops) |
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return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd; |
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else if (mapping->a_ops == &gfs2_rgrp_aops) return container_of(mapping, struct gfs2_sbd, sd_aspace); |
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else return inode->i_sb->s_fs_info; } |
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extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno); extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
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int rahead, struct buffer_head **bhp); |
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extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh); extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create); |
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enum { REMOVE_JDATA = 0, REMOVE_META = 1, }; extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta); |
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extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen); extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, struct buffer_head **bhp); |
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static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip, struct buffer_head **bhp) { |
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return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp); |
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} |
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struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen); |
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#define buffer_busy(bh) \ ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) |
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#endif /* __DIO_DOT_H__ */ |