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Diffstat (limited to 'fs/xfs/xfs_ialloc.h')
| -rw-r--r-- | fs/xfs/xfs_ialloc.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/fs/xfs/xfs_ialloc.h b/fs/xfs/xfs_ialloc.h new file mode 100644 index 00000000000..db6d0015cec --- /dev/null +++ b/fs/xfs/xfs_ialloc.h @@ -0,0 +1,184 @@ +/* + * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 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. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ +#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. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_INODES) +int xfs_ialloc_inodes(struct xfs_mount *mp); +#define XFS_IALLOC_INODES(mp) xfs_ialloc_inodes(mp) +#else +#define XFS_IALLOC_INODES(mp) ((mp)->m_ialloc_inos) +#endif +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_BLOCKS) +xfs_extlen_t xfs_ialloc_blocks(struct xfs_mount *mp); +#define XFS_IALLOC_BLOCKS(mp) xfs_ialloc_blocks(mp) +#else +#define XFS_IALLOC_BLOCKS(mp) ((mp)->m_ialloc_blks) +#endif + +/* + * 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. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MAKE_IPTR) +struct xfs_dinode *xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o); +#define XFS_MAKE_IPTR(mp,b,o) xfs_make_iptr(mp,b,o) +#else +#define XFS_MAKE_IPTR(mp,b,o) \ + ((xfs_dinode_t *)(xfs_buf_offset(b, (o) << (mp)->m_sb.sb_inodelog))) +#endif + +/* + * Find a free (set) bit in the inode bitmask. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_FIND_FREE) +int xfs_ialloc_find_free(xfs_inofree_t *fp); +#define XFS_IALLOC_FIND_FREE(fp) xfs_ialloc_find_free(fp) +#else +#define XFS_IALLOC_FIND_FREE(fp) xfs_lowbit64(*(fp)) +#endif + + +#ifdef __KERNEL__ + +/* + * Prototypes for visible xfs_ialloc.c routines. + */ + +/* + * 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__ */ |