1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
4 * Copyright (C) 2017 Oracle.
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_shared.h"
12 #include "xfs_trans_resv.h"
15 #include "xfs_mount.h"
16 #include "xfs_defer.h"
17 #include "xfs_inode.h"
18 #include "xfs_btree.h"
20 #include "xfs_alloc_btree.h"
21 #include "xfs_alloc.h"
22 #include "xfs_ialloc.h"
24 /* Find the size of the AG, in blocks. */
30 ASSERT(agno < mp->m_sb.sb_agcount);
32 if (agno < mp->m_sb.sb_agcount - 1)
33 return mp->m_sb.sb_agblocks;
34 return mp->m_sb.sb_dblocks - (agno * mp->m_sb.sb_agblocks);
38 * Verify that an AG block number pointer neither points outside the AG
39 * nor points at static metadata.
49 eoag = xfs_ag_block_count(mp, agno);
52 if (agbno <= XFS_AGFL_BLOCK(mp))
58 * Verify that an FS block number pointer neither points outside the
59 * filesystem nor points at static AG metadata.
66 xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno);
68 if (agno >= mp->m_sb.sb_agcount)
70 return xfs_verify_agbno(mp, agno, XFS_FSB_TO_AGBNO(mp, fsbno));
73 /* Calculate the first and last possible inode number in an AG. */
84 eoag = xfs_ag_block_count(mp, agno);
87 * Calculate the first inode, which will be in the first
88 * cluster-aligned block after the AGFL.
90 bno = round_up(XFS_AGFL_BLOCK(mp) + 1, mp->m_cluster_align);
91 *first = XFS_AGB_TO_AGINO(mp, bno);
94 * Calculate the last inode, which will be at the end of the
95 * last (aligned) cluster that can be allocated in the AG.
97 bno = round_down(eoag, mp->m_cluster_align);
98 *last = XFS_AGB_TO_AGINO(mp, bno) - 1;
102 * Verify that an AG inode number pointer neither points outside the AG
103 * nor points at static metadata.
107 struct xfs_mount *mp,
114 xfs_agino_range(mp, agno, &first, &last);
115 return agino >= first && agino <= last;
119 * Verify that an FS inode number pointer neither points outside the
120 * filesystem nor points at static AG metadata.
124 struct xfs_mount *mp,
127 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ino);
128 xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
130 if (agno >= mp->m_sb.sb_agcount)
132 if (XFS_AGINO_TO_INO(mp, agno, agino) != ino)
134 return xfs_verify_agino(mp, agno, agino);
137 /* Is this an internal inode number? */
140 struct xfs_mount *mp,
143 return ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
144 (xfs_sb_version_hasquota(&mp->m_sb) &&
145 xfs_is_quota_inode(&mp->m_sb, ino));
149 * Verify that a directory entry's inode number doesn't point at an internal
150 * inode, empty space, or static AG metadata.
154 struct xfs_mount *mp,
157 if (xfs_internal_inum(mp, ino))
159 return xfs_verify_ino(mp, ino);
163 * Verify that an realtime block number pointer doesn't point off the
164 * end of the realtime device.
168 struct xfs_mount *mp,
171 return rtbno < mp->m_sb.sb_rblocks;
174 /* Calculate the range of valid icount values. */
177 struct xfs_mount *mp,
178 unsigned long long *min,
179 unsigned long long *max)
181 unsigned long long nr_inos = 0;
184 /* root, rtbitmap, rtsum all live in the first chunk */
185 *min = XFS_INODES_PER_CHUNK;
187 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
188 xfs_agino_t first, last;
190 xfs_agino_range(mp, agno, &first, &last);
191 nr_inos += last - first + 1;
196 /* Sanity-checking of inode counts. */
199 struct xfs_mount *mp,
200 unsigned long long icount)
202 unsigned long long min, max;
204 xfs_icount_range(mp, &min, &max);
205 return icount >= min && icount <= max;