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https://github.com/torvalds/linux
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b839dadae8
This patch adds a new slab for gfs2 transactions. That allows us to reduce kernel memory fragmentation, have better organization of data for analysis of vmcore dumps. A new centralized function is added to free the slab objects, and it exposes use-after-free by giving warnings if a transaction is freed while it still has bd elements attached to its buffers or ail lists. We make sure to initialize those transaction ail lists so we can check their integrity when freeing. At a later time, we should add a slab initialization function to make it more efficient, but for this initial patch I wanted to minimize the impact. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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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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#ifndef __TRANS_DOT_H__
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#define __TRANS_DOT_H__
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#include <linux/buffer_head.h>
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struct gfs2_sbd;
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struct gfs2_rgrpd;
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struct gfs2_glock;
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#define RES_DINODE 1
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#define RES_INDIRECT 1
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#define RES_JDATA 1
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#define RES_DATA 1
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#define RES_LEAF 1
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#define RES_RG_HDR 1
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#define RES_RG_BIT 2
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#define RES_EATTR 1
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#define RES_STATFS 1
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#define RES_QUOTA 2
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/* reserve either the number of blocks to be allocated plus the rg header
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* block, or all of the blocks in the rg, whichever is smaller */
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static inline unsigned int gfs2_rg_blocks(const struct gfs2_inode *ip, unsigned requested)
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{
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struct gfs2_rgrpd *rgd = ip->i_res.rs_rbm.rgd;
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if (requested < rgd->rd_length)
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return requested + 1;
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return rgd->rd_length;
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}
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extern int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
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unsigned int revokes);
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extern void gfs2_trans_end(struct gfs2_sbd *sdp);
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extern void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh);
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extern void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh);
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extern void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
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extern void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len);
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extern void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr);
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#endif /* __TRANS_DOT_H__ */
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