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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_alloc.h
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#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__ */
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