415cb80037
The ocfs2 write code loops through a page much like the block code, except that ocfs2 allocation units can be any size, including larger than page size. Typically it's equal to or larger than page size - most kernels run 4k pages, the minimum ocfs2 allocation (cluster) size. Some changes introduced during 2.6.23 changed the way writes to pages are handled, and inadvertantly broke support for > 4k page size. Instead of just writing one cluster at a time, we now handle the whole page in one pass. This means that multiple (small) seperate allocations might happen in the same pass. The allocation code howver typically optimizes by getting the maximum which was reserved. This triggered a BUG_ON in the extend code where it'd ask for a single bit (for one part of a > 4k page) and get back more than it asked for. Fix this by providing a variant of the high level allocation function which allows the caller to specify a maximum. The traditional function remains and just calls the new one with a maximum determined from the initial reservation. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* suballoc.h
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*
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* Defines sub allocator api
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*
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* Copyright (C) 2003, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef _CHAINALLOC_H_
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#define _CHAINALLOC_H_
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typedef int (group_search_t)(struct inode *,
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struct buffer_head *,
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u32,
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u32,
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u16 *,
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u16 *);
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struct ocfs2_alloc_context {
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struct inode *ac_inode; /* which bitmap are we allocating from? */
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struct buffer_head *ac_bh; /* file entry bh */
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u32 ac_bits_wanted;
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u32 ac_bits_given;
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#define OCFS2_AC_USE_LOCAL 1
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#define OCFS2_AC_USE_MAIN 2
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#define OCFS2_AC_USE_INODE 3
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#define OCFS2_AC_USE_META 4
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u32 ac_which;
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/* these are used by the chain search */
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u16 ac_chain;
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int ac_allow_chain_relink;
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group_search_t *ac_group_search;
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u64 ac_last_group;
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};
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void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
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static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
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{
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return ac->ac_bits_wanted - ac->ac_bits_given;
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}
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int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
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struct ocfs2_dinode *fe,
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struct ocfs2_alloc_context **ac);
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int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
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struct ocfs2_alloc_context **ac);
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int ocfs2_reserve_clusters(struct ocfs2_super *osb,
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u32 bits_wanted,
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struct ocfs2_alloc_context **ac);
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int ocfs2_claim_metadata(struct ocfs2_super *osb,
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handle_t *handle,
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struct ocfs2_alloc_context *ac,
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u32 bits_wanted,
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u16 *suballoc_bit_start,
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u32 *num_bits,
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u64 *blkno_start);
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int ocfs2_claim_new_inode(struct ocfs2_super *osb,
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handle_t *handle,
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struct ocfs2_alloc_context *ac,
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u16 *suballoc_bit,
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u64 *fe_blkno);
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int ocfs2_claim_clusters(struct ocfs2_super *osb,
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handle_t *handle,
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struct ocfs2_alloc_context *ac,
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u32 min_clusters,
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u32 *cluster_start,
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u32 *num_clusters);
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/*
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* Use this variant of ocfs2_claim_clusters to specify a maxiumum
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* number of clusters smaller than the allocation reserved.
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*/
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int __ocfs2_claim_clusters(struct ocfs2_super *osb,
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handle_t *handle,
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struct ocfs2_alloc_context *ac,
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u32 min_clusters,
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u32 max_clusters,
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u32 *cluster_start,
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u32 *num_clusters);
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int ocfs2_free_suballoc_bits(handle_t *handle,
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struct inode *alloc_inode,
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struct buffer_head *alloc_bh,
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unsigned int start_bit,
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u64 bg_blkno,
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unsigned int count);
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int ocfs2_free_dinode(handle_t *handle,
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struct inode *inode_alloc_inode,
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struct buffer_head *inode_alloc_bh,
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struct ocfs2_dinode *di);
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int ocfs2_free_clusters(handle_t *handle,
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struct inode *bitmap_inode,
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struct buffer_head *bitmap_bh,
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u64 start_blk,
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unsigned int num_clusters);
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static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
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{
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u64 group = block - (u64) bit;
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return group;
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}
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static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
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u64 bg_blkno)
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{
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/* This should work for all block group descriptors as only
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* the 1st group descriptor of the cluster bitmap is
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* different. */
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if (bg_blkno == osb->first_cluster_group_blkno)
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return 0;
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/* the rest of the block groups are located at the beginning
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* of their 1st cluster, so a direct translation just
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* works. */
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return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
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}
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static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
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{
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
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}
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/* This is for local alloc ONLY. Others should use the task-specific
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* apis above. */
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int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
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struct ocfs2_alloc_context *ac);
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#endif /* _CHAINALLOC_H_ */
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