fs/xfs/xfs_ialloc.h - linux/kernel/git/gregkh/tty - Git at Google

 /*
  * Copyright (c) 2000 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_IALLOC_H__
 #define	__XFS_IALLOC_H__

 struct xfs_buf;
 struct xfs_dinode;
 struct xfs_mount;
 struct xfs_trans;

 /*
  * Allocation parameters for inode allocation.
  */
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_INODES)
 int xfs_ialloc_inodes(struct xfs_mount *mp);
 #define	XFS_IALLOC_INODES(mp)	xfs_ialloc_inodes(mp)
 #else
 #define	XFS_IALLOC_INODES(mp)	((mp)->m_ialloc_inos)
 #endif
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_BLOCKS)
 xfs_extlen_t xfs_ialloc_blocks(struct xfs_mount *mp);
 #define	XFS_IALLOC_BLOCKS(mp)	xfs_ialloc_blocks(mp)
 #else
 #define	XFS_IALLOC_BLOCKS(mp)	((mp)->m_ialloc_blks)
 #endif

 /*
  * For small block file systems, move inodes in clusters of this size.
  * When we don't have a lot of memory, however, we go a bit smaller
  * to reduce the number of AGI and ialloc btree blocks we need to keep
  * around for xfs_dilocate().  We choose which one to use in
  * xfs_mount_int().
  */
 #define	XFS_INODE_BIG_CLUSTER_SIZE	8192
 #define	XFS_INODE_SMALL_CLUSTER_SIZE	4096
 #define	XFS_INODE_CLUSTER_SIZE(mp)	(mp)->m_inode_cluster_size

 /*
  * Make an inode pointer out of the buffer/offset.
  */
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MAKE_IPTR)
 struct xfs_dinode *xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o);
 #define	XFS_MAKE_IPTR(mp,b,o)		xfs_make_iptr(mp,b,o)
 #else
 #define	XFS_MAKE_IPTR(mp,b,o) \
 	((xfs_dinode_t *)(xfs_buf_offset(b, (o) << (mp)->m_sb.sb_inodelog)))
 #endif

 /*
  * Find a free (set) bit in the inode bitmask.
  */
 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_FIND_FREE)
 int xfs_ialloc_find_free(xfs_inofree_t *fp);
 #define	XFS_IALLOC_FIND_FREE(fp)	xfs_ialloc_find_free(fp)
 #else
 #define	XFS_IALLOC_FIND_FREE(fp)	xfs_lowbit64(*(fp))
 #endif


 #ifdef __KERNEL__

 /*
  * Prototypes for visible xfs_ialloc.c routines.
  */

 /*
  * Allocate an inode on disk.
  * Mode is used to tell whether the new inode will need space, and whether
  * it is a directory.
  *
  * To work within the constraint of one allocation per transaction,
  * xfs_dialloc() is designed to be called twice if it has to do an
  * allocation to make more free inodes.  If an inode is
  * available without an allocation, agbp would be set to the current
  * agbp and alloc_done set to false.
  * If an allocation needed to be done, agbp would be set to the
  * inode header of the allocation group and alloc_done set to true.
  * The caller should then commit the current transaction and allocate a new
  * transaction.  xfs_dialloc() should then be called again with
  * the agbp value returned from the previous call.
  *
  * Once we successfully pick an inode its number is returned and the
  * on-disk data structures are updated.  The inode itself is not read
  * in, since doing so would break ordering constraints with xfs_reclaim.
  *
  * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
  */
 int					/* error */
 xfs_dialloc(
 	struct xfs_trans *tp,		/* transaction pointer */
 	xfs_ino_t	parent,		/* parent inode (directory) */
 	mode_t		mode,		/* mode bits for new inode */
 	int		okalloc,	/* ok to allocate more space */
 	struct xfs_buf	**agbp,		/* buf for a.g. inode header */
 	boolean_t	*alloc_done,	/* an allocation was done to replenish
 					   the free inodes */
 	xfs_ino_t	*inop);		/* inode number allocated */

 /*
  * Free disk inode.  Carefully avoids touching the incore inode, all
  * manipulations incore are the caller's responsibility.
  * The on-disk inode is not changed by this operation, only the
  * btree (free inode mask) is changed.
  */
 int					/* error */
 xfs_difree(
 	struct xfs_trans *tp,		/* transaction pointer */
 	xfs_ino_t	inode,		/* inode to be freed */
 	struct xfs_bmap_free *flist,	/* extents to free */
 	int		*delete,	/* set if inode cluster was deleted */
 	xfs_ino_t	*first_ino);	/* first inode in deleted cluster */

 /*
  * Return the location of the inode in bno/len/off,
  * for mapping it into a buffer.
  */
 int
 xfs_dilocate(
 	struct xfs_mount *mp,		/* file system mount structure */
 	struct xfs_trans *tp,		/* transaction pointer */
 	xfs_ino_t	ino,		/* inode to locate */
 	xfs_fsblock_t	*bno,		/* output: block containing inode */
 	int		*len,		/* output: num blocks in cluster*/
 	int		*off,		/* output: index in block of inode */
 	uint		flags);		/* flags for inode btree lookup */

 /*
  * Compute and fill in value of m_in_maxlevels.
  */
 void
 xfs_ialloc_compute_maxlevels(
 	struct xfs_mount *mp);		/* file system mount structure */

 /*
  * Log specified fields for the ag hdr (inode section)
  */
 void
 xfs_ialloc_log_agi(
 	struct xfs_trans *tp,		/* transaction pointer */
 	struct xfs_buf	*bp,		/* allocation group header buffer */
 	int		fields);	/* bitmask of fields to log */

 /*
  * Read in the allocation group header (inode allocation section)
  */
 int					/* error */
 xfs_ialloc_read_agi(
 	struct xfs_mount *mp,		/* file system mount structure */
 	struct xfs_trans *tp,		/* transaction pointer */
 	xfs_agnumber_t	agno,		/* allocation group number */
 	struct xfs_buf	**bpp);		/* allocation group hdr buf */

 #endif	/* __KERNEL__ */

 #endif	/* __XFS_IALLOC_H__ */
	/*
	* Copyright (c) 2000 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_IALLOC_H__
	#define __XFS_IALLOC_H__

	struct xfs_buf;
	struct xfs_dinode;
	struct xfs_mount;
	struct xfs_trans;

	/*
	* Allocation parameters for inode allocation.
	*/
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_INODES)
	int xfs_ialloc_inodes(struct xfs_mount *mp);
	#define XFS_IALLOC_INODES(mp) xfs_ialloc_inodes(mp)
	#else
	#define XFS_IALLOC_INODES(mp) ((mp)->m_ialloc_inos)
	#endif
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_BLOCKS)
	xfs_extlen_t xfs_ialloc_blocks(struct xfs_mount *mp);
	#define XFS_IALLOC_BLOCKS(mp) xfs_ialloc_blocks(mp)
	#else
	#define XFS_IALLOC_BLOCKS(mp) ((mp)->m_ialloc_blks)
	#endif

	/*
	* For small block file systems, move inodes in clusters of this size.
	* When we don't have a lot of memory, however, we go a bit smaller
	* to reduce the number of AGI and ialloc btree blocks we need to keep
	* around for xfs_dilocate(). We choose which one to use in
	* xfs_mount_int().
	*/
	#define XFS_INODE_BIG_CLUSTER_SIZE 8192
	#define XFS_INODE_SMALL_CLUSTER_SIZE 4096
	#define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size

	/*
	* Make an inode pointer out of the buffer/offset.
	*/
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_MAKE_IPTR)
	struct xfs_dinode xfs_make_iptr(struct xfs_mount mp, struct xfs_buf *b, int o);
	#define XFS_MAKE_IPTR(mp,b,o) xfs_make_iptr(mp,b,o)
	#else
	#define XFS_MAKE_IPTR(mp,b,o) \
	((xfs_dinode_t *)(xfs_buf_offset(b, (o) << (mp)->m_sb.sb_inodelog)))
	#endif

	/*
	* Find a free (set) bit in the inode bitmask.
	*/
	#if XFS_WANT_FUNCS \|\| (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_FIND_FREE)
	int xfs_ialloc_find_free(xfs_inofree_t *fp);
	#define XFS_IALLOC_FIND_FREE(fp) xfs_ialloc_find_free(fp)
	#else
	#define XFS_IALLOC_FIND_FREE(fp) xfs_lowbit64(*(fp))
	#endif


	#ifdef __KERNEL__

	/*
	* Prototypes for visible xfs_ialloc.c routines.
	*/

	/*
	* Allocate an inode on disk.
	* Mode is used to tell whether the new inode will need space, and whether
	* it is a directory.
	*
	* To work within the constraint of one allocation per transaction,
	* xfs_dialloc() is designed to be called twice if it has to do an
	* allocation to make more free inodes. If an inode is
	* available without an allocation, agbp would be set to the current
	* agbp and alloc_done set to false.
	* If an allocation needed to be done, agbp would be set to the
	* inode header of the allocation group and alloc_done set to true.
	* The caller should then commit the current transaction and allocate a new
	* transaction. xfs_dialloc() should then be called again with
	* the agbp value returned from the previous call.
	*
	* Once we successfully pick an inode its number is returned and the
	* on-disk data structures are updated. The inode itself is not read
	* in, since doing so would break ordering constraints with xfs_reclaim.
	*
	* agbp should be set to NULL on the first call, alloc_done set to FALSE.
	*/
	int /* error */
	xfs_dialloc(
	struct xfs_trans tp, / transaction pointer */
	xfs_ino_t parent, /* parent inode (directory) */
	mode_t mode, /* mode bits for new inode */
	int okalloc, /* ok to allocate more space */
	struct xfs_buf *agbp, / buf for a.g. inode header */
	boolean_t alloc_done, / an allocation was done to replenish
	the free inodes */
	xfs_ino_t inop); / inode number allocated */

	/*
	* Free disk inode. Carefully avoids touching the incore inode, all
	* manipulations incore are the caller's responsibility.
	* The on-disk inode is not changed by this operation, only the
	* btree (free inode mask) is changed.
	*/
	int /* error */
	xfs_difree(
	struct xfs_trans tp, / transaction pointer */
	xfs_ino_t inode, /* inode to be freed */
	struct xfs_bmap_free flist, / extents to free */
	int delete, / set if inode cluster was deleted */
	xfs_ino_t first_ino); / first inode in deleted cluster */

	/*
	* Return the location of the inode in bno/len/off,
	* for mapping it into a buffer.
	*/
	int
	xfs_dilocate(
	struct xfs_mount mp, / file system mount structure */
	struct xfs_trans tp, / transaction pointer */
	xfs_ino_t ino, /* inode to locate */
	xfs_fsblock_t bno, / output: block containing inode */
	int len, / output: num blocks in cluster*/
	int off, / output: index in block of inode */
	uint flags); /* flags for inode btree lookup */

	/*
	* Compute and fill in value of m_in_maxlevels.
	*/
	void
	xfs_ialloc_compute_maxlevels(
	struct xfs_mount mp); / file system mount structure */

	/*
	* Log specified fields for the ag hdr (inode section)
	*/
	void
	xfs_ialloc_log_agi(
	struct xfs_trans tp, / transaction pointer */
	struct xfs_buf bp, / allocation group header buffer */
	int fields); /* bitmask of fields to log */

	/*
	* Read in the allocation group header (inode allocation section)
	*/
	int /* error */
	xfs_ialloc_read_agi(
	struct xfs_mount mp, / file system mount structure */
	struct xfs_trans tp, / transaction pointer */
	xfs_agnumber_t agno, /* allocation group number */
	struct xfs_buf *bpp); / allocation group hdr buf */

	#endif /* __KERNEL__ */

	#endif /* __XFS_IALLOC_H__ */