173 строки
5.4 KiB
C
173 строки
5.4 KiB
C
/*
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* Copyright (c) 2000,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_IALLOC_H__
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#define __XFS_IALLOC_H__
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struct xfs_buf;
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struct xfs_dinode;
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struct xfs_imap;
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_btree_cur;
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/* Move inodes in clusters of this size */
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#define XFS_INODE_BIG_CLUSTER_SIZE 8192
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struct xfs_icluster {
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bool deleted; /* record is deleted */
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xfs_ino_t first_ino; /* first inode number */
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uint64_t alloc; /* inode phys. allocation bitmap for
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* sparse chunks */
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};
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/* Calculate and return the number of filesystem blocks per inode cluster */
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static inline int
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xfs_icluster_size_fsb(
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struct xfs_mount *mp)
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{
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if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size)
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return 1;
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return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog;
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}
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/*
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* Make an inode pointer out of the buffer/offset.
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*/
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static inline struct xfs_dinode *
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xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
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{
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return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
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}
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/*
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* Allocate an inode on disk.
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* Mode is used to tell whether the new inode will need space, and whether
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* it is a directory.
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*
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* To work within the constraint of one allocation per transaction,
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* xfs_dialloc() is designed to be called twice if it has to do an
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* allocation to make more free inodes. If an inode is
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* available without an allocation, agbp would be set to the current
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* agbp and alloc_done set to false.
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* If an allocation needed to be done, agbp would be set to the
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* inode header of the allocation group and alloc_done set to true.
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* The caller should then commit the current transaction and allocate a new
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* transaction. xfs_dialloc() should then be called again with
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* the agbp value returned from the previous call.
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*
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* Once we successfully pick an inode its number is returned and the
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* on-disk data structures are updated. The inode itself is not read
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* in, since doing so would break ordering constraints with xfs_reclaim.
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*
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* *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
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*/
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int /* error */
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xfs_dialloc(
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struct xfs_trans *tp, /* transaction pointer */
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xfs_ino_t parent, /* parent inode (directory) */
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umode_t mode, /* mode bits for new inode */
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int okalloc, /* ok to allocate more space */
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struct xfs_buf **agbp, /* buf for a.g. inode header */
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xfs_ino_t *inop); /* inode number allocated */
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/*
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* Free disk inode. Carefully avoids touching the incore inode, all
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* manipulations incore are the caller's responsibility.
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* The on-disk inode is not changed by this operation, only the
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* btree (free inode mask) is changed.
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*/
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int /* error */
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xfs_difree(
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struct xfs_trans *tp, /* transaction pointer */
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xfs_ino_t inode, /* inode to be freed */
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struct xfs_defer_ops *dfops, /* extents to free */
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struct xfs_icluster *ifree); /* cluster info if deleted */
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/*
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* Return the location of the inode in imap, for mapping it into a buffer.
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*/
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int
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xfs_imap(
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struct xfs_mount *mp, /* file system mount structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_ino_t ino, /* inode to locate */
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struct xfs_imap *imap, /* location map structure */
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uint flags); /* flags for inode btree lookup */
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/*
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* Compute and fill in value of m_in_maxlevels.
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*/
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void
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xfs_ialloc_compute_maxlevels(
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struct xfs_mount *mp); /* file system mount structure */
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/*
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* Log specified fields for the ag hdr (inode section)
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*/
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void
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xfs_ialloc_log_agi(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *bp, /* allocation group header buffer */
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int fields); /* bitmask of fields to log */
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/*
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* Read in the allocation group header (inode allocation section)
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*/
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int /* error */
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xfs_ialloc_read_agi(
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struct xfs_mount *mp, /* file system mount structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno, /* allocation group number */
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struct xfs_buf **bpp); /* allocation group hdr buf */
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/*
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* Read in the allocation group header to initialise the per-ag data
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* in the mount structure
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*/
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int
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xfs_ialloc_pagi_init(
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struct xfs_mount *mp, /* file system mount structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_agnumber_t agno); /* allocation group number */
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/*
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* Lookup a record by ino in the btree given by cur.
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*/
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int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
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xfs_lookup_t dir, int *stat);
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/*
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* Get the data from the pointed-to record.
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*/
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int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
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xfs_inobt_rec_incore_t *rec, int *stat);
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/*
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* Inode chunk initialisation routine
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*/
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int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
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struct list_head *buffer_list, int icount,
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xfs_agnumber_t agno, xfs_agblock_t agbno,
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xfs_agblock_t length, unsigned int gen);
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int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
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xfs_agnumber_t agno, struct xfs_buf **bpp);
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#endif /* __XFS_IALLOC_H__ */
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