http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/xfs/xfs_alloc.h

/* * 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 */ /* * 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 - !actg */ char userdata; /* set if this is user data */ } 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 */ #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 /* * 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 */ /* * 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 */ /* * 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 */ 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__ */ #endif /* __XFS_ALLOC_H__ */