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root/fs/xfs/xfs_ialloc.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. xfs_make_iptr
  2. xfs_ialloc_find_free

/*
 * Copyright (c) 2000,2005 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_IALLOC_H__
#define __XFS_IALLOC_H__

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

/*
 * Allocation parameters for inode allocation.
 */
#define XFS_IALLOC_INODES(mp)   (mp)->m_ialloc_inos
#define XFS_IALLOC_BLOCKS(mp)   (mp)->m_ialloc_blks

/*
 * Move inodes in clusters of this size.
 */
#define XFS_INODE_BIG_CLUSTER_SIZE      8192
#define XFS_INODE_CLUSTER_SIZE(mp)      (mp)->m_inode_cluster_size

/*
 * Make an inode pointer out of the buffer/offset.
 */
#define XFS_MAKE_IPTR(mp,b,o)           xfs_make_iptr(mp,b,o)
static inline struct xfs_dinode *
xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
{
        return (xfs_dinode_t *)
                (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
}

/*
 * Find a free (set) bit in the inode bitmask.
 */
#define XFS_IALLOC_FIND_FREE(fp)        xfs_ialloc_find_free(fp)
static inline int xfs_ialloc_find_free(xfs_inofree_t *fp)
{
        return xfs_lowbit64(*fp);
}


#ifdef __KERNEL__
/*
 * 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 */

/*
 * Read in the allocation group header to initialise the per-ag data
 * in the mount structure
 */
int
xfs_ialloc_pagi_init(
        struct xfs_mount *mp,           /* file system mount structure */
        struct xfs_trans *tp,           /* transaction pointer */
        xfs_agnumber_t  agno);          /* allocation group number */

#endif  /* __KERNEL__ */

#endif  /* __XFS_IALLOC_H__ */

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