227 lines
8.0 KiB
C
227 lines
8.0 KiB
C
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/*
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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_btree_cur;
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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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extern struct workqueue_struct *xfs_alloc_wq;
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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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#define XFS_ALLOCTYPE_ANY_AG 0x01 /* allocate anywhere, use rotor */
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#define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */
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#define XFS_ALLOCTYPE_START_AG 0x04 /* anywhere, start in this a.g. */
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#define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */
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#define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */
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#define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */
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#define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */
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/* this should become an enum again when the tracing code is fixed */
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typedef unsigned int xfs_alloctype_t;
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#define XFS_ALLOC_TYPES \
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{ XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \
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{ XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \
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{ XFS_ALLOCTYPE_START_AG, "START_AG" }, \
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{ XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \
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{ XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \
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{ XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \
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{ XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" }
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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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#define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
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#define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
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#define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */
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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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struct xfs_inode *ip; /* for userdata zeroing method */
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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_agblock_t min_agbno; /* set an agbno range for NEAR allocs */
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xfs_agblock_t max_agbno; /* ... */
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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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int datatype; /* mask defining data type treatment */
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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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xfs_fsblock_t firstblock; /* io first block allocated */
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struct xfs_owner_info oinfo; /* owner of blocks being allocated */
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enum xfs_ag_resv_type resv; /* block reservation to use */
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} xfs_alloc_arg_t;
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/*
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* Defines for datatype
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*/
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#define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/
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#define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */
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#define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */
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#define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */
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static inline bool
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xfs_alloc_is_userdata(int datatype)
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{
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return (datatype & ~XFS_ALLOC_NOBUSY) != 0;
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}
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static inline bool
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xfs_alloc_allow_busy_reuse(int datatype)
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{
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return (datatype & XFS_ALLOC_NOBUSY) == 0;
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}
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/* freespace limit calculations */
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#define XFS_ALLOC_AGFL_RESERVE 4
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unsigned int xfs_alloc_set_aside(struct xfs_mount *mp);
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unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp);
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xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp,
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struct xfs_perag *pag, xfs_extlen_t need,
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xfs_extlen_t reserved);
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unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp,
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struct xfs_perag *pag);
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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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struct xfs_owner_info *oinfo, /* extent owner */
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enum xfs_ag_resv_type type); /* block reservation type */
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int /* error */
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xfs_alloc_lookup_ge(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agblock_t bno, /* starting block of extent */
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xfs_extlen_t len, /* length of extent */
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int *stat); /* success/failure */
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int /* error */
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xfs_alloc_get_rec(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agblock_t *bno, /* output: starting block of extent */
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xfs_extlen_t *len, /* output: length of extent */
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int *stat); /* output: success/failure */
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int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
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xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
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int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
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int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
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struct xfs_buf **agbp);
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xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp);
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#endif /* __XFS_ALLOC_H__ */
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