forked from luck/tmp_suning_uos_patched
6dbd822487
It is possible to reduce the size of GFS2 inodes by taking the i_alloc structure out of the gfs2_inode. This patch allocates the i_alloc structure whenever its needed, and frees it afterward. This decreases the amount of low memory we use at the expense of requiring a memory allocation for each page or partial page that we write. A quick test with postmark shows that the overhead is not measurable and I also note that OCFS2 use the same approach. In the future I'd like to solve the problem by shrinking down the size of the members of the i_alloc structure, but for now, this reduces the immediate problem of using too much low-memory on x86 and doesn't add too much overhead. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
73 lines
2.3 KiB
C
73 lines
2.3 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 __RGRP_DOT_H__
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#define __RGRP_DOT_H__
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struct gfs2_rgrpd;
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struct gfs2_sbd;
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struct gfs2_holder;
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void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd);
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struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk);
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struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp);
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struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd);
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void gfs2_clear_rgrpd(struct gfs2_sbd *sdp);
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int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh);
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int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd);
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void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd);
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void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd);
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void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd);
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struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
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static inline void gfs2_alloc_put(struct gfs2_inode *ip)
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{
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BUG_ON(ip->i_alloc == NULL);
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kfree(ip->i_alloc);
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ip->i_alloc = NULL;
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}
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int gfs2_inplace_reserve_i(struct gfs2_inode *ip,
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char *file, unsigned int line);
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#define gfs2_inplace_reserve(ip) \
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gfs2_inplace_reserve_i((ip), __FILE__, __LINE__)
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void gfs2_inplace_release(struct gfs2_inode *ip);
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unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block);
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u64 gfs2_alloc_data(struct gfs2_inode *ip);
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u64 gfs2_alloc_meta(struct gfs2_inode *ip);
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u64 gfs2_alloc_di(struct gfs2_inode *ip, u64 *generation);
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void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen);
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void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
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void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
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void gfs2_unlink_di(struct inode *inode);
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struct gfs2_rgrp_list {
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unsigned int rl_rgrps;
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unsigned int rl_space;
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struct gfs2_rgrpd **rl_rgd;
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struct gfs2_holder *rl_ghs;
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};
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void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
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u64 block);
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void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state,
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int flags);
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void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
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u64 gfs2_ri_total(struct gfs2_sbd *sdp);
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#endif /* __RGRP_DOT_H__ */
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