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https://github.com/edk2-porting/linux-next.git
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3974320ca6
This patch implements iomap for block mapping, and switches the block_map function to use it under the covers. The additional IOMAP_F_BOUNDARY iomap flag indicates when iomap has reached a "metadata boundary" and fetching the next mapping is likely to incur an additional I/O. This flag is used for setting the bh buffer boundary flag. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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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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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __BMAP_DOT_H__
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#define __BMAP_DOT_H__
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#include <linux/iomap.h>
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#include "inode.h"
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struct inode;
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struct gfs2_inode;
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struct page;
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/**
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* gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
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* @ip: the file
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* @len: the number of bytes to be written to the file
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* @data_blocks: returns the number of data blocks required
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* @ind_blocks: returns the number of indirect blocks required
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*
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*/
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static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
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unsigned int len,
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unsigned int *data_blocks,
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unsigned int *ind_blocks)
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{
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const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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unsigned int tmp;
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BUG_ON(gfs2_is_dir(ip));
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*data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
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*ind_blocks = 3 * (sdp->sd_max_height - 1);
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for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
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tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
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*ind_blocks += tmp;
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}
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}
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extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
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extern int gfs2_block_map(struct inode *inode, sector_t lblock,
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struct buffer_head *bh, int create);
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extern int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
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unsigned flags, struct iomap *iomap);
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extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
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u64 *dblock, unsigned *extlen);
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extern int gfs2_setattr_size(struct inode *inode, u64 size);
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extern void gfs2_trim_blocks(struct inode *inode);
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extern int gfs2_truncatei_resume(struct gfs2_inode *ip);
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extern int gfs2_file_dealloc(struct gfs2_inode *ip);
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extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
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unsigned int len);
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extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
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extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
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#endif /* __BMAP_DOT_H__ */
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