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; 26struct xfs_btree_cur; 27 28/* Move inodes in clusters of this size */ 29#define XFS_INODE_BIG_CLUSTER_SIZE 8192 30 31struct xfs_icluster { 32 bool deleted; /* record is deleted */ 33 xfs_ino_t first_ino; /* first inode number */ 34 uint64_t alloc; /* inode phys. allocation bitmap for 35 * sparse chunks */ 36}; 37 38/* Calculate and return the number of filesystem blocks per inode cluster */ 39static inline int 40xfs_icluster_size_fsb( 41 struct xfs_mount *mp) 42{ 43 if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size) 44 return 1; 45 return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog; 46} 47 48/* 49 * Make an inode pointer out of the buffer/offset. 50 */ 51static inline struct xfs_dinode * 52xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o) 53{ 54 return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog); 55} 56 57/* 58 * Allocate an inode on disk. 59 * Mode is used to tell whether the new inode will need space, and whether 60 * it is a directory. 61 * 62 * To work within the constraint of one allocation per transaction, 63 * xfs_dialloc() is designed to be called twice if it has to do an 64 * allocation to make more free inodes. If an inode is 65 * available without an allocation, agbp would be set to the current 66 * agbp and alloc_done set to false. 67 * If an allocation needed to be done, agbp would be set to the 68 * inode header of the allocation group and alloc_done set to true. 69 * The caller should then commit the current transaction and allocate a new 70 * transaction. xfs_dialloc() should then be called again with 71 * the agbp value returned from the previous call. 72 * 73 * Once we successfully pick an inode its number is returned and the 74 * on-disk data structures are updated. The inode itself is not read 75 * in, since doing so would break ordering constraints with xfs_reclaim. 76 * 77 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE. 78 */ 79int /* error */ 80xfs_dialloc( 81 struct xfs_trans *tp, /* transaction pointer */ 82 xfs_ino_t parent, /* parent inode (directory) */ 83 umode_t mode, /* mode bits for new inode */ 84 struct xfs_buf **agbp, /* buf for a.g. inode header */ 85 xfs_ino_t *inop); /* inode number allocated */ 86 87/* 88 * Free disk inode. Carefully avoids touching the incore inode, all 89 * manipulations incore are the caller's responsibility. 90 * The on-disk inode is not changed by this operation, only the 91 * btree (free inode mask) is changed. 92 */ 93int /* error */ 94xfs_difree( 95 struct xfs_trans *tp, /* transaction pointer */ 96 xfs_ino_t inode, /* inode to be freed */ 97 struct xfs_defer_ops *dfops, /* extents to free */ 98 struct xfs_icluster *ifree); /* cluster info if deleted */ 99 100/* 101 * Return the location of the inode in imap, for mapping it into a buffer. 102 */ 103int 104xfs_imap( 105 struct xfs_mount *mp, /* file system mount structure */ 106 struct xfs_trans *tp, /* transaction pointer */ 107 xfs_ino_t ino, /* inode to locate */ 108 struct xfs_imap *imap, /* location map structure */ 109 uint flags); /* flags for inode btree lookup */ 110 111/* 112 * Compute and fill in value of m_in_maxlevels. 113 */ 114void 115xfs_ialloc_compute_maxlevels( 116 struct xfs_mount *mp); /* file system mount structure */ 117 118/* 119 * Log specified fields for the ag hdr (inode section) 120 */ 121void 122xfs_ialloc_log_agi( 123 struct xfs_trans *tp, /* transaction pointer */ 124 struct xfs_buf *bp, /* allocation group header buffer */ 125 int fields); /* bitmask of fields to log */ 126 127/* 128 * Read in the allocation group header (inode allocation section) 129 */ 130int /* error */ 131xfs_ialloc_read_agi( 132 struct xfs_mount *mp, /* file system mount structure */ 133 struct xfs_trans *tp, /* transaction pointer */ 134 xfs_agnumber_t agno, /* allocation group number */ 135 struct xfs_buf **bpp); /* allocation group hdr buf */ 136 137/* 138 * Read in the allocation group header to initialise the per-ag data 139 * in the mount structure 140 */ 141int 142xfs_ialloc_pagi_init( 143 struct xfs_mount *mp, /* file system mount structure */ 144 struct xfs_trans *tp, /* transaction pointer */ 145 xfs_agnumber_t agno); /* allocation group number */ 146 147/* 148 * Lookup a record by ino in the btree given by cur. 149 */ 150int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino, 151 xfs_lookup_t dir, int *stat); 152 153/* 154 * Get the data from the pointed-to record. 155 */ 156int xfs_inobt_get_rec(struct xfs_btree_cur *cur, 157 xfs_inobt_rec_incore_t *rec, int *stat); 158 159/* 160 * Inode chunk initialisation routine 161 */ 162int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp, 163 struct list_head *buffer_list, int icount, 164 xfs_agnumber_t agno, xfs_agblock_t agbno, 165 xfs_agblock_t length, unsigned int gen); 166 167int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp, 168 xfs_agnumber_t agno, struct xfs_buf **bpp); 169 170union xfs_btree_rec; 171void xfs_inobt_btrec_to_irec(struct xfs_mount *mp, union xfs_btree_rec *rec, 172 struct xfs_inobt_rec_incore *irec); 173 174int xfs_ialloc_cluster_alignment(struct xfs_mount *mp); 175void xfs_ialloc_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno, 176 xfs_agino_t *first, xfs_agino_t *last); 177bool xfs_verify_agino(struct xfs_mount *mp, xfs_agnumber_t agno, 178 xfs_agino_t agino); 179bool xfs_verify_ino(struct xfs_mount *mp, xfs_ino_t ino); 180bool xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino); 181bool xfs_verify_dir_ino(struct xfs_mount *mp, xfs_ino_t ino); 182 183#endif /* __XFS_IALLOC_H__ */ 184