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218 lines
7.1 KiB
C
218 lines
7.1 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* 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 License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would 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
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* GNU 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 License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_ALLOC_H__
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#define __XFS_ALLOC_H__
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struct xfs_buf;
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struct xfs_mount;
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struct xfs_perag;
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struct xfs_trans;
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/*
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* Freespace allocation types. Argument to xfs_alloc_[v]extent.
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*/
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typedef enum xfs_alloctype
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{
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XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */
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XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */
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XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */
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XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */
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XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */
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XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */
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XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */
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} xfs_alloctype_t;
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/*
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* Flags for xfs_alloc_fix_freelist.
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*/
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#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
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#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
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/*
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* In order to avoid ENOSPC-related deadlock caused by
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* out-of-order locking of AGF buffer (PV 947395), we place
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* constraints on the relationship among actual allocations for
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* data blocks, freelist blocks, and potential file data bmap
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* btree blocks. However, these restrictions may result in no
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* actual space allocated for a delayed extent, for example, a data
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* block in a certain AG is allocated but there is no additional
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* block for the additional bmap btree block due to a split of the
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* bmap btree of the file. The result of this may lead to an
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* infinite loop in xfssyncd when the file gets flushed to disk and
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* all delayed extents need to be actually allocated. To get around
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* this, we explicitly set aside a few blocks which will not be
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* reserved in delayed allocation. Considering the minimum number of
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* needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap
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* btree requires 1 fsb, so we set the number of set-aside blocks
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* to 4 + 4*agcount.
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*/
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#define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4))
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/*
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* Argument structure for xfs_alloc routines.
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* This is turned into a structure to avoid having 20 arguments passed
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* down several levels of the stack.
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*/
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typedef struct xfs_alloc_arg {
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struct xfs_trans *tp; /* transaction pointer */
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struct xfs_mount *mp; /* file system mount point */
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struct xfs_buf *agbp; /* buffer for a.g. freelist header */
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struct xfs_perag *pag; /* per-ag struct for this agno */
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xfs_fsblock_t fsbno; /* file system block number */
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xfs_agnumber_t agno; /* allocation group number */
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xfs_agblock_t agbno; /* allocation group-relative block # */
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xfs_extlen_t minlen; /* minimum size of extent */
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xfs_extlen_t maxlen; /* maximum size of extent */
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xfs_extlen_t mod; /* mod value for extent size */
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xfs_extlen_t prod; /* prod value for extent size */
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xfs_extlen_t minleft; /* min blocks must be left after us */
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xfs_extlen_t total; /* total blocks needed in xaction */
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xfs_extlen_t alignment; /* align answer to multiple of this */
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xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
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xfs_extlen_t len; /* output: actual size of extent */
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xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
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xfs_alloctype_t otype; /* original allocation type */
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char wasdel; /* set if allocation was prev delayed */
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char wasfromfl; /* set if allocation is from freelist */
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char isfl; /* set if is freelist blocks - !acctg */
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char userdata; /* set if this is user data */
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xfs_fsblock_t firstblock; /* io first block allocated */
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} xfs_alloc_arg_t;
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/*
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* Defines for userdata
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*/
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#define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/
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#define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */
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/*
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* Find the length of the longest extent in an AG.
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*/
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xfs_extlen_t
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xfs_alloc_longest_free_extent(struct xfs_mount *mp,
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struct xfs_perag *pag);
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#ifdef __KERNEL__
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#if defined(XFS_ALLOC_TRACE)
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/*
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* Allocation tracing buffer size.
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*/
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#define XFS_ALLOC_TRACE_SIZE 4096
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extern ktrace_t *xfs_alloc_trace_buf;
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/*
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* Types for alloc tracing.
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*/
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#define XFS_ALLOC_KTRACE_ALLOC 1
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#define XFS_ALLOC_KTRACE_FREE 2
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#define XFS_ALLOC_KTRACE_MODAGF 3
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#define XFS_ALLOC_KTRACE_BUSY 4
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#define XFS_ALLOC_KTRACE_UNBUSY 5
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#define XFS_ALLOC_KTRACE_BUSYSEARCH 6
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#endif
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void
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xfs_alloc_mark_busy(xfs_trans_t *tp,
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xfs_agnumber_t agno,
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xfs_agblock_t bno,
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xfs_extlen_t len);
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void
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xfs_alloc_clear_busy(xfs_trans_t *tp,
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xfs_agnumber_t ag,
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int idx);
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#endif /* __KERNEL__ */
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/*
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* Compute and fill in value of m_ag_maxlevels.
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*/
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void
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xfs_alloc_compute_maxlevels(
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struct xfs_mount *mp); /* file system mount structure */
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/*
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* Get a block from the freelist.
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* Returns with the buffer for the block gotten.
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*/
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int /* error */
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xfs_alloc_get_freelist(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *agbp, /* buffer containing the agf structure */
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xfs_agblock_t *bnop, /* block address retrieved from freelist */
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int btreeblk); /* destination is a AGF btree */
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/*
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* Log the given fields from the agf structure.
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*/
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void
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xfs_alloc_log_agf(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *bp, /* buffer for a.g. freelist header */
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int fields);/* mask of fields to be logged (XFS_AGF_...) */
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/*
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* Interface for inode allocation to force the pag data to be initialized.
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*/
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int /* error */
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xfs_alloc_pagf_init(
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struct xfs_mount *mp, /* file system mount structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno, /* allocation group number */
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int flags); /* XFS_ALLOC_FLAGS_... */
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/*
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* Put the block on the freelist for the allocation group.
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*/
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int /* error */
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xfs_alloc_put_freelist(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *agbp, /* buffer for a.g. freelist header */
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struct xfs_buf *agflbp,/* buffer for a.g. free block array */
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xfs_agblock_t bno, /* block being freed */
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int btreeblk); /* owner was a AGF btree */
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/*
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* Read in the allocation group header (free/alloc section).
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*/
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int /* error */
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xfs_alloc_read_agf(
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struct xfs_mount *mp, /* mount point structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno, /* allocation group number */
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int flags, /* XFS_ALLOC_FLAG_... */
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struct xfs_buf **bpp); /* buffer for the ag freelist header */
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/*
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* Allocate an extent (variable-size).
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*/
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int /* error */
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xfs_alloc_vextent(
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xfs_alloc_arg_t *args); /* allocation argument structure */
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/*
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* Free an extent.
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*/
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int /* error */
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xfs_free_extent(
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struct xfs_trans *tp, /* transaction pointer */
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xfs_fsblock_t bno, /* starting block number of extent */
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xfs_extlen_t len); /* length of extent */
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#endif /* __XFS_ALLOC_H__ */
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