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,
91 xfs_ialloc_cluster_alignment(mp));
92 *first = XFS_OFFBNO_TO_AGINO(mp, bno, 0);
95 * Calculate the last inode, which will be at the end of the
96 * last (aligned) cluster that can be allocated in the AG.
98 bno = round_down(eoag, xfs_ialloc_cluster_alignment(mp));
99 *last = XFS_OFFBNO_TO_AGINO(mp, bno, 0) - 1;
103 * Verify that an AG inode number pointer neither points outside the AG
104 * nor points at static metadata.
108 struct xfs_mount *mp,
115 xfs_agino_range(mp, agno, &first, &last);
116 return agino >= first && agino <= last;
120 * Verify that an FS inode number pointer neither points outside the
121 * filesystem nor points at static AG metadata.
125 struct xfs_mount *mp,
128 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ino);
129 xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
131 if (agno >= mp->m_sb.sb_agcount)
133 if (XFS_AGINO_TO_INO(mp, agno, agino) != ino)
135 return xfs_verify_agino(mp, agno, agino);
138 /* Is this an internal inode number? */
141 struct xfs_mount *mp,
144 return ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
145 (xfs_sb_version_hasquota(&mp->m_sb) &&
146 xfs_is_quota_inode(&mp->m_sb, ino));
150 * Verify that a directory entry's inode number doesn't point at an internal
151 * inode, empty space, or static AG metadata.
155 struct xfs_mount *mp,
158 if (xfs_internal_inum(mp, ino))
160 return xfs_verify_ino(mp, ino);
164 * Verify that an realtime block number pointer doesn't point off the
165 * end of the realtime device.
169 struct xfs_mount *mp,
172 return rtbno < mp->m_sb.sb_rblocks;
175 /* Calculate the range of valid icount values. */
178 struct xfs_mount *mp,
179 unsigned long long *min,
180 unsigned long long *max)
182 unsigned long long nr_inos = 0;
185 /* root, rtbitmap, rtsum all live in the first chunk */
186 *min = XFS_INODES_PER_CHUNK;
188 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
189 xfs_agino_t first, last;
191 xfs_agino_range(mp, agno, &first, &last);
192 nr_inos += last - first + 1;
197 /* Sanity-checking of inode counts. */
200 struct xfs_mount *mp,
201 unsigned long long icount)
203 unsigned long long min, max;
205 xfs_icount_range(mp, &min, &max);
206 return icount >= min && icount <= max;