forked from luck/tmp_suning_uos_patched
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>
56 lines
1.7 KiB
C
56 lines
1.7 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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* localalloc.h
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*
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* Function prototypes
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*
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* Copyright (C) 2002, 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 OCFS2_LOCALALLOC_H
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#define OCFS2_LOCALALLOC_H
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int ocfs2_load_local_alloc(struct ocfs2_super *osb);
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void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb);
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int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
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int node_num,
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struct ocfs2_dinode **alloc_copy);
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int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
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struct ocfs2_dinode *alloc);
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int ocfs2_alloc_should_use_local(struct ocfs2_super *osb,
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u64 bits);
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struct ocfs2_alloc_context;
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int ocfs2_reserve_local_alloc_bits(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_local_alloc_bits(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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u32 *bit_off,
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u32 *num_bits);
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#endif /* OCFS2_LOCALALLOC_H */
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