1/* 2 * Copyright (c) 2000,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18#ifndef __XFS_IALLOC_H__ 19#define __XFS_IALLOC_H__ 20 21struct xfs_buf; 22struct xfs_dinode; 23struct xfs_imap; 24struct xfs_mount; 25struct xfs_trans; 26 27/* 28 * Allocation parameters for inode allocation. 29 */ 30#define XFS_IALLOC_INODES(mp) (mp)->m_ialloc_inos 31#define XFS_IALLOC_BLOCKS(mp) (mp)->m_ialloc_blks 32 33/* 34 * Move inodes in clusters of this size. 35 */ 36#define XFS_INODE_BIG_CLUSTER_SIZE 8192 37#define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size 38 39/* 40 * Make an inode pointer out of the buffer/offset. 41 */ 42static inline struct xfs_dinode * 43xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o) 44{ 45 return (xfs_dinode_t *) 46 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog)); 47} 48 49/* 50 * Allocate an inode on disk. 51 * Mode is used to tell whether the new inode will need space, and whether 52 * it is a directory. 53 * 54 * To work within the constraint of one allocation per transaction, 55 * xfs_dialloc() is designed to be called twice if it has to do an 56 * allocation to make more free inodes. If an inode is 57 * available without an allocation, agbp would be set to the current 58 * agbp and alloc_done set to false. 59 * If an allocation needed to be done, agbp would be set to the 60 * inode header of the allocation group and alloc_done set to true. 61 * The caller should then commit the current transaction and allocate a new 62 * transaction. xfs_dialloc() should then be called again with 63 * the agbp value returned from the previous call. 64 * 65 * Once we successfully pick an inode its number is returned and the 66 * on-disk data structures are updated. The inode itself is not read 67 * in, since doing so would break ordering constraints with xfs_reclaim. 68 * 69 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE. 70 */ 71int /* error */ 72xfs_dialloc( 73 struct xfs_trans *tp, /* transaction pointer */ 74 xfs_ino_t parent, /* parent inode (directory) */ 75 umode_t mode, /* mode bits for new inode */ 76 int okalloc, /* ok to allocate more space */ 77 struct xfs_buf **agbp, /* buf for a.g. inode header */ 78 xfs_ino_t *inop); /* inode number allocated */ 79 80/* 81 * Free disk inode. Carefully avoids touching the incore inode, all 82 * manipulations incore are the caller's responsibility. 83 * The on-disk inode is not changed by this operation, only the 84 * btree (free inode mask) is changed. 85 */ 86int /* error */ 87xfs_difree( 88 struct xfs_trans *tp, /* transaction pointer */ 89 xfs_ino_t inode, /* inode to be freed */ 90 struct xfs_bmap_free *flist, /* extents to free */ 91 int *delete, /* set if inode cluster was deleted */ 92 xfs_ino_t *first_ino); /* first inode in deleted cluster */ 93 94/* 95 * Return the location of the inode in imap, for mapping it into a buffer. 96 */ 97int 98xfs_imap( 99 struct xfs_mount *mp, /* file system mount structure */ 100 struct xfs_trans *tp, /* transaction pointer */ 101 xfs_ino_t ino, /* inode to locate */ 102 struct xfs_imap *imap, /* location map structure */ 103 uint flags); /* flags for inode btree lookup */ 104 105/* 106 * Compute and fill in value of m_in_maxlevels. 107 */ 108void 109xfs_ialloc_compute_maxlevels( 110 struct xfs_mount *mp); /* file system mount structure */ 111 112/* 113 * Log specified fields for the ag hdr (inode section) 114 */ 115void 116xfs_ialloc_log_agi( 117 struct xfs_trans *tp, /* transaction pointer */ 118 struct xfs_buf *bp, /* allocation group header buffer */ 119 int fields); /* bitmask of fields to log */ 120 121/* 122 * Read in the allocation group header (inode allocation section) 123 */ 124int /* error */ 125xfs_ialloc_read_agi( 126 struct xfs_mount *mp, /* file system mount structure */ 127 struct xfs_trans *tp, /* transaction pointer */ 128 xfs_agnumber_t agno, /* allocation group number */ 129 struct xfs_buf **bpp); /* allocation group hdr buf */ 130 131/* 132 * Read in the allocation group header to initialise the per-ag data 133 * in the mount structure 134 */ 135int 136xfs_ialloc_pagi_init( 137 struct xfs_mount *mp, /* file system mount structure */ 138 struct xfs_trans *tp, /* transaction pointer */ 139 xfs_agnumber_t agno); /* allocation group number */ 140 141/* 142 * Lookup a record by ino in the btree given by cur. 143 */ 144int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino, 145 xfs_lookup_t dir, int *stat); 146 147/* 148 * Get the data from the pointed-to record. 149 */ 150int xfs_inobt_get_rec(struct xfs_btree_cur *cur, 151 xfs_inobt_rec_incore_t *rec, int *stat); 152 153/* 154 * Inode chunk initialisation routine 155 */ 156int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp, 157 struct list_head *buffer_list, 158 xfs_agnumber_t agno, xfs_agblock_t agbno, 159 xfs_agblock_t length, unsigned int gen); 160 161extern const struct xfs_buf_ops xfs_agi_buf_ops; 162 163#endif /* __XFS_IALLOC_H__ */ 164