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 struct 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 */ 39 static inline int 40 xfs_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 */ 51 static inline struct xfs_dinode * 52 xfs_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 */ 79 int /* error */ 80 xfs_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 int okalloc, /* ok to allocate more space */ 85 struct xfs_buf **agbp, /* buf for a.g. inode header */ 86 xfs_ino_t *inop); /* inode number allocated */ 87 88 /* 89 * Free disk inode. Carefully avoids touching the incore inode, all 90 * manipulations incore are the caller's responsibility. 91 * The on-disk inode is not changed by this operation, only the 92 * btree (free inode mask) is changed. 93 */ 94 int /* error */ 95 xfs_difree( 96 struct xfs_trans *tp, /* transaction pointer */ 97 xfs_ino_t inode, /* inode to be freed */ 98 struct xfs_bmap_free *flist, /* extents to free */ 99 struct xfs_icluster *ifree); /* cluster info if deleted */ 100 101 /* 102 * Return the location of the inode in imap, for mapping it into a buffer. 103 */ 104 int 105 xfs_imap( 106 struct xfs_mount *mp, /* file system mount structure */ 107 struct xfs_trans *tp, /* transaction pointer */ 108 xfs_ino_t ino, /* inode to locate */ 109 struct xfs_imap *imap, /* location map structure */ 110 uint flags); /* flags for inode btree lookup */ 111 112 /* 113 * Compute and fill in value of m_in_maxlevels. 114 */ 115 void 116 xfs_ialloc_compute_maxlevels( 117 struct xfs_mount *mp); /* file system mount structure */ 118 119 /* 120 * Log specified fields for the ag hdr (inode section) 121 */ 122 void 123 xfs_ialloc_log_agi( 124 struct xfs_trans *tp, /* transaction pointer */ 125 struct xfs_buf *bp, /* allocation group header buffer */ 126 int fields); /* bitmask of fields to log */ 127 128 /* 129 * Read in the allocation group header (inode allocation section) 130 */ 131 int /* error */ 132 xfs_ialloc_read_agi( 133 struct xfs_mount *mp, /* file system mount structure */ 134 struct xfs_trans *tp, /* transaction pointer */ 135 xfs_agnumber_t agno, /* allocation group number */ 136 struct xfs_buf **bpp); /* allocation group hdr buf */ 137 138 /* 139 * Read in the allocation group header to initialise the per-ag data 140 * in the mount structure 141 */ 142 int 143 xfs_ialloc_pagi_init( 144 struct xfs_mount *mp, /* file system mount structure */ 145 struct xfs_trans *tp, /* transaction pointer */ 146 xfs_agnumber_t agno); /* allocation group number */ 147 148 /* 149 * Lookup a record by ino in the btree given by cur. 150 */ 151 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino, 152 xfs_lookup_t dir, int *stat); 153 154 /* 155 * Get the data from the pointed-to record. 156 */ 157 int xfs_inobt_get_rec(struct xfs_btree_cur *cur, 158 xfs_inobt_rec_incore_t *rec, int *stat); 159 160 /* 161 * Inode chunk initialisation routine 162 */ 163 int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp, 164 struct list_head *buffer_list, int icount, 165 xfs_agnumber_t agno, xfs_agblock_t agbno, 166 xfs_agblock_t length, unsigned int gen); 167 168 int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp, 169 xfs_agnumber_t agno, struct xfs_buf **bpp); 170 171 172 #endif /* __XFS_IALLOC_H__ */ 173