7b71876980
boilerplate. SGI-PV: 913862 SGI-Modid: xfs-linux:xfs-kern:23903a Signed-off-by: Nathan Scott <nathans@sgi.com>
154 lines
5.1 KiB
C
154 lines
5.1 KiB
C
/*
|
|
* 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
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
#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 */
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __XFS_IALLOC_H__ */
|