mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
219 lines
7.1 KiB
C
219 lines
7.1 KiB
C
/*
|
|
* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_ALLOC_H__
|
|
#define __XFS_ALLOC_H__
|
|
|
|
struct xfs_buf;
|
|
struct xfs_mount;
|
|
struct xfs_perag;
|
|
struct xfs_trans;
|
|
|
|
/*
|
|
* Freespace allocation types. Argument to xfs_alloc_[v]extent.
|
|
*/
|
|
typedef enum xfs_alloctype
|
|
{
|
|
XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */
|
|
XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */
|
|
XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */
|
|
XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */
|
|
XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */
|
|
XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */
|
|
XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */
|
|
} xfs_alloctype_t;
|
|
|
|
/*
|
|
* Flags for xfs_alloc_fix_freelist.
|
|
*/
|
|
#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
|
|
#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
|
|
|
|
/*
|
|
* In order to avoid ENOSPC-related deadlock caused by
|
|
* out-of-order locking of AGF buffer (PV 947395), we place
|
|
* constraints on the relationship among actual allocations for
|
|
* data blocks, freelist blocks, and potential file data bmap
|
|
* btree blocks. However, these restrictions may result in no
|
|
* actual space allocated for a delayed extent, for example, a data
|
|
* block in a certain AG is allocated but there is no additional
|
|
* block for the additional bmap btree block due to a split of the
|
|
* bmap btree of the file. The result of this may lead to an
|
|
* infinite loop in xfssyncd when the file gets flushed to disk and
|
|
* all delayed extents need to be actually allocated. To get around
|
|
* this, we explicitly set aside a few blocks which will not be
|
|
* reserved in delayed allocation. Considering the minimum number of
|
|
* needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap
|
|
* btree requires 1 fsb, so we set the number of set-aside blocks
|
|
* to 4 + 4*agcount.
|
|
*/
|
|
#define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4))
|
|
|
|
/*
|
|
* Argument structure for xfs_alloc routines.
|
|
* This is turned into a structure to avoid having 20 arguments passed
|
|
* down several levels of the stack.
|
|
*/
|
|
typedef struct xfs_alloc_arg {
|
|
struct xfs_trans *tp; /* transaction pointer */
|
|
struct xfs_mount *mp; /* file system mount point */
|
|
struct xfs_buf *agbp; /* buffer for a.g. freelist header */
|
|
struct xfs_perag *pag; /* per-ag struct for this agno */
|
|
xfs_fsblock_t fsbno; /* file system block number */
|
|
xfs_agnumber_t agno; /* allocation group number */
|
|
xfs_agblock_t agbno; /* allocation group-relative block # */
|
|
xfs_extlen_t minlen; /* minimum size of extent */
|
|
xfs_extlen_t maxlen; /* maximum size of extent */
|
|
xfs_extlen_t mod; /* mod value for extent size */
|
|
xfs_extlen_t prod; /* prod value for extent size */
|
|
xfs_extlen_t minleft; /* min blocks must be left after us */
|
|
xfs_extlen_t total; /* total blocks needed in xaction */
|
|
xfs_extlen_t alignment; /* align answer to multiple of this */
|
|
xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
|
|
xfs_extlen_t len; /* output: actual size of extent */
|
|
xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
|
|
xfs_alloctype_t otype; /* original allocation type */
|
|
char wasdel; /* set if allocation was prev delayed */
|
|
char wasfromfl; /* set if allocation is from freelist */
|
|
char isfl; /* set if is freelist blocks - !acctg */
|
|
char userdata; /* set if this is user data */
|
|
xfs_fsblock_t firstblock; /* io first block allocated */
|
|
} xfs_alloc_arg_t;
|
|
|
|
/*
|
|
* Defines for userdata
|
|
*/
|
|
#define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/
|
|
#define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */
|
|
|
|
/*
|
|
* Find the length of the longest extent in an AG.
|
|
*/
|
|
xfs_extlen_t
|
|
xfs_alloc_longest_free_extent(struct xfs_mount *mp,
|
|
struct xfs_perag *pag);
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#if defined(XFS_ALLOC_TRACE)
|
|
/*
|
|
* Allocation tracing buffer size.
|
|
*/
|
|
#define XFS_ALLOC_TRACE_SIZE 4096
|
|
extern ktrace_t *xfs_alloc_trace_buf;
|
|
|
|
/*
|
|
* Types for alloc tracing.
|
|
*/
|
|
#define XFS_ALLOC_KTRACE_ALLOC 1
|
|
#define XFS_ALLOC_KTRACE_FREE 2
|
|
#define XFS_ALLOC_KTRACE_MODAGF 3
|
|
#define XFS_ALLOC_KTRACE_BUSY 4
|
|
#define XFS_ALLOC_KTRACE_UNBUSY 5
|
|
#define XFS_ALLOC_KTRACE_BUSYSEARCH 6
|
|
#endif
|
|
|
|
void
|
|
xfs_alloc_mark_busy(xfs_trans_t *tp,
|
|
xfs_agnumber_t agno,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len);
|
|
|
|
void
|
|
xfs_alloc_clear_busy(xfs_trans_t *tp,
|
|
xfs_agnumber_t ag,
|
|
int idx);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
/*
|
|
* Compute and fill in value of m_ag_maxlevels.
|
|
*/
|
|
void
|
|
xfs_alloc_compute_maxlevels(
|
|
struct xfs_mount *mp); /* file system mount structure */
|
|
|
|
/*
|
|
* Get a block from the freelist.
|
|
* Returns with the buffer for the block gotten.
|
|
*/
|
|
int /* error */
|
|
xfs_alloc_get_freelist(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_buf *agbp, /* buffer containing the agf structure */
|
|
xfs_agblock_t *bnop, /* block address retrieved from freelist */
|
|
int btreeblk); /* destination is a AGF btree */
|
|
|
|
/*
|
|
* Log the given fields from the agf structure.
|
|
*/
|
|
void
|
|
xfs_alloc_log_agf(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_buf *bp, /* buffer for a.g. freelist header */
|
|
int fields);/* mask of fields to be logged (XFS_AGF_...) */
|
|
|
|
/*
|
|
* Interface for inode allocation to force the pag data to be initialized.
|
|
*/
|
|
int /* error */
|
|
xfs_alloc_pagf_init(
|
|
struct xfs_mount *mp, /* file system mount structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
int flags); /* XFS_ALLOC_FLAGS_... */
|
|
|
|
/*
|
|
* Put the block on the freelist for the allocation group.
|
|
*/
|
|
int /* error */
|
|
xfs_alloc_put_freelist(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_buf *agbp, /* buffer for a.g. freelist header */
|
|
struct xfs_buf *agflbp,/* buffer for a.g. free block array */
|
|
xfs_agblock_t bno, /* block being freed */
|
|
int btreeblk); /* owner was a AGF btree */
|
|
|
|
/*
|
|
* Read in the allocation group header (free/alloc section).
|
|
*/
|
|
int /* error */
|
|
xfs_alloc_read_agf(
|
|
struct xfs_mount *mp, /* mount point structure */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
int flags, /* XFS_ALLOC_FLAG_... */
|
|
struct xfs_buf **bpp); /* buffer for the ag freelist header */
|
|
|
|
/*
|
|
* Allocate an extent (variable-size).
|
|
*/
|
|
int /* error */
|
|
xfs_alloc_vextent(
|
|
xfs_alloc_arg_t *args); /* allocation argument structure */
|
|
|
|
/*
|
|
* Free an extent.
|
|
*/
|
|
int /* error */
|
|
xfs_free_extent(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_fsblock_t bno, /* starting block number of extent */
|
|
xfs_extlen_t len); /* length of extent */
|
|
|
|
#endif /* __XFS_ALLOC_H__ */
|