You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
163 lines
5.2 KiB
163 lines
5.2 KiB
/* |
|
* 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_imap; |
|
struct xfs_mount; |
|
struct xfs_trans; |
|
struct xfs_btree_cur; |
|
|
|
/* Move inodes in clusters of this size */ |
|
#define XFS_INODE_BIG_CLUSTER_SIZE 8192 |
|
|
|
/* Calculate and return the number of filesystem blocks per inode cluster */ |
|
static inline int |
|
xfs_icluster_size_fsb( |
|
struct xfs_mount *mp) |
|
{ |
|
if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size) |
|
return 1; |
|
return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog; |
|
} |
|
|
|
/* |
|
* Make an inode pointer out of the buffer/offset. |
|
*/ |
|
static inline struct xfs_dinode * |
|
xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o) |
|
{ |
|
return (struct xfs_dinode *) |
|
(xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog)); |
|
} |
|
|
|
/* |
|
* 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) */ |
|
umode_t mode, /* mode bits for new inode */ |
|
int okalloc, /* ok to allocate more space */ |
|
struct xfs_buf **agbp, /* buf for a.g. inode header */ |
|
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 *deleted, /* set if inode cluster was deleted */ |
|
xfs_ino_t *first_ino); /* first inode in deleted cluster */ |
|
|
|
/* |
|
* Return the location of the inode in imap, for mapping it into a buffer. |
|
*/ |
|
int |
|
xfs_imap( |
|
struct xfs_mount *mp, /* file system mount structure */ |
|
struct xfs_trans *tp, /* transaction pointer */ |
|
xfs_ino_t ino, /* inode to locate */ |
|
struct xfs_imap *imap, /* location map structure */ |
|
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 */ |
|
|
|
/* |
|
* Lookup a record by ino in the btree given by cur. |
|
*/ |
|
int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino, |
|
xfs_lookup_t dir, int *stat); |
|
|
|
/* |
|
* Get the data from the pointed-to record. |
|
*/ |
|
int xfs_inobt_get_rec(struct xfs_btree_cur *cur, |
|
xfs_inobt_rec_incore_t *rec, int *stat); |
|
|
|
/* |
|
* Inode chunk initialisation routine |
|
*/ |
|
int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp, |
|
struct list_head *buffer_list, |
|
xfs_agnumber_t agno, xfs_agblock_t agbno, |
|
xfs_agblock_t length, unsigned int gen); |
|
|
|
#endif /* __XFS_IALLOC_H__ */
|
|
|