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 21 struct xfs_buf; 22 struct xfs_dinode; 23 struct xfs_imap; 24 struct xfs_mount; 25 struct xfs_trans; 26 struct xfs_btree_cur; 27 28 /* Move inodes in clusters of this size */ 29 #define XFS_INODE_BIG_CLUSTER_SIZE 8192 30 31 /* Calculate and return the number of filesystem blocks per inode cluster */ 32 static inline int 33 xfs_icluster_size_fsb( 34 struct xfs_mount *mp) 35 { 36 if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size) 37 return 1; 38 return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog; 39 } 40 41 /* 42 * Make an inode pointer out of the buffer/offset. 43 */ 44 static inline struct xfs_dinode * 45 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o) 46 { 47 return (struct xfs_dinode *) 48 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog)); 49 } 50 51 /* 52 * Allocate an inode on disk. 53 * Mode is used to tell whether the new inode will need space, and whether 54 * it is a directory. 55 * 56 * To work within the constraint of one allocation per transaction, 57 * xfs_dialloc() is designed to be called twice if it has to do an 58 * allocation to make more free inodes. If an inode is 59 * available without an allocation, agbp would be set to the current 60 * agbp and alloc_done set to false. 61 * If an allocation needed to be done, agbp would be set to the 62 * inode header of the allocation group and alloc_done set to true. 63 * The caller should then commit the current transaction and allocate a new 64 * transaction. xfs_dialloc() should then be called again with 65 * the agbp value returned from the previous call. 66 * 67 * Once we successfully pick an inode its number is returned and the 68 * on-disk data structures are updated. The inode itself is not read 69 * in, since doing so would break ordering constraints with xfs_reclaim. 70 * 71 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE. 72 */ 73 int /* error */ 74 xfs_dialloc( 75 struct xfs_trans *tp, /* transaction pointer */ 76 xfs_ino_t parent, /* parent inode (directory) */ 77 umode_t mode, /* mode bits for new inode */ 78 int okalloc, /* ok to allocate more space */ 79 struct xfs_buf **agbp, /* buf for a.g. inode header */ 80 xfs_ino_t *inop); /* inode number allocated */ 81 82 /* 83 * Free disk inode. Carefully avoids touching the incore inode, all 84 * manipulations incore are the caller's responsibility. 85 * The on-disk inode is not changed by this operation, only the 86 * btree (free inode mask) is changed. 87 */ 88 int /* error */ 89 xfs_difree( 90 struct xfs_trans *tp, /* transaction pointer */ 91 xfs_ino_t inode, /* inode to be freed */ 92 struct xfs_bmap_free *flist, /* extents to free */ 93 int *deleted, /* set if inode cluster was deleted */ 94 xfs_ino_t *first_ino); /* first inode in deleted cluster */ 95 96 /* 97 * Return the location of the inode in imap, for mapping it into a buffer. 98 */ 99 int 100 xfs_imap( 101 struct xfs_mount *mp, /* file system mount structure */ 102 struct xfs_trans *tp, /* transaction pointer */ 103 xfs_ino_t ino, /* inode to locate */ 104 struct xfs_imap *imap, /* location map structure */ 105 uint flags); /* flags for inode btree lookup */ 106 107 /* 108 * Compute and fill in value of m_in_maxlevels. 109 */ 110 void 111 xfs_ialloc_compute_maxlevels( 112 struct xfs_mount *mp); /* file system mount structure */ 113 114 /* 115 * Log specified fields for the ag hdr (inode section) 116 */ 117 void 118 xfs_ialloc_log_agi( 119 struct xfs_trans *tp, /* transaction pointer */ 120 struct xfs_buf *bp, /* allocation group header buffer */ 121 int fields); /* bitmask of fields to log */ 122 123 /* 124 * Read in the allocation group header (inode allocation section) 125 */ 126 int /* error */ 127 xfs_ialloc_read_agi( 128 struct xfs_mount *mp, /* file system mount structure */ 129 struct xfs_trans *tp, /* transaction pointer */ 130 xfs_agnumber_t agno, /* allocation group number */ 131 struct xfs_buf **bpp); /* allocation group hdr buf */ 132 133 /* 134 * Read in the allocation group header to initialise the per-ag data 135 * in the mount structure 136 */ 137 int 138 xfs_ialloc_pagi_init( 139 struct xfs_mount *mp, /* file system mount structure */ 140 struct xfs_trans *tp, /* transaction pointer */ 141 xfs_agnumber_t agno); /* allocation group number */ 142 143 /* 144 * Lookup a record by ino in the btree given by cur. 145 */ 146 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino, 147 xfs_lookup_t dir, int *stat); 148 149 /* 150 * Get the data from the pointed-to record. 151 */ 152 int xfs_inobt_get_rec(struct xfs_btree_cur *cur, 153 xfs_inobt_rec_incore_t *rec, int *stat); 154 155 /* 156 * Inode chunk initialisation routine 157 */ 158 int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp, 159 struct list_head *buffer_list, 160 xfs_agnumber_t agno, xfs_agblock_t agbno, 161 xfs_agblock_t length, unsigned int gen); 162 163 int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp, 164 xfs_agnumber_t agno, struct xfs_buf **bpp); 165 166 167 #endif /* __XFS_IALLOC_H__ */ 168