331b6cc0ea
Improve support for writing to XFS partitions. Work done by: Russell Cattelan <cattelan at xfs dot org>
155 lines
5.1 KiB
C
155 lines
5.1 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_mount;
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struct xfs_trans;
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/*
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* Allocation parameters for inode allocation.
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*/
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#define XFS_IALLOC_INODES(mp) (mp)->m_ialloc_inos
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#define XFS_IALLOC_BLOCKS(mp) (mp)->m_ialloc_blks
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/*
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* For small block file systems, move inodes in clusters of this size.
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* When we don't have a lot of memory, however, we go a bit smaller
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* to reduce the number of AGI and ialloc btree blocks we need to keep
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* around for xfs_dilocate(). We choose which one to use in
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* xfs_mount_int().
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*/
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#define XFS_INODE_BIG_CLUSTER_SIZE 8192
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#define XFS_INODE_SMALL_CLUSTER_SIZE 4096
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#define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size
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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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#define XFS_MAKE_IPTR(mp,b,o) xfs_make_iptr(mp,b,o)
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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_dinode_t *)
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(xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
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}
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/*
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* Find a free (set) bit in the inode bitmask.
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*/
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#define XFS_IALLOC_FIND_FREE(fp) xfs_ialloc_find_free(fp)
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static inline int xfs_ialloc_find_free(xfs_inofree_t *fp)
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{
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return xfs_lowbit64(*fp);
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}
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#ifdef __KERNEL__
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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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mode_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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boolean_t *alloc_done, /* an allocation was done to replenish
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the free inodes */
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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_bmap_free *flist, /* extents to free */
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int *delete, /* set if inode cluster was deleted */
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xfs_ino_t *first_ino); /* first inode in deleted cluster */
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/*
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* Return the location of the inode in bno/len/off,
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* for mapping it into a buffer.
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*/
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int
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xfs_dilocate(
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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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xfs_fsblock_t *bno, /* output: block containing inode */
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int *len, /* output: num blocks in cluster*/
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int *off, /* output: index in block of inode */
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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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#endif /* __KERNEL__ */
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#endif /* __XFS_IALLOC_H__ */
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