1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2006 Silicon Graphics, Inc. 4 * Copyright (c) 2013 Red Hat, Inc. 5 * All Rights Reserved. 6 */ 7 #include "xfs.h" 8 #include "xfs_fs.h" 9 #include "xfs_shared.h" 10 #include "xfs_format.h" 11 #include "xfs_log_format.h" 12 #include "xfs_trans_resv.h" 13 #include "xfs_mount.h" 14 #include "xfs_inode.h" 15 #include "xfs_quota.h" 16 #include "xfs_trans.h" 17 #include "xfs_qm.h" 18 #include "xfs_error.h" 19 #include "xfs_cksum.h" 20 #include "xfs_trace.h" 21 22 int 23 xfs_calc_dquots_per_chunk( 24 unsigned int nbblks) /* basic block units */ 25 { 26 ASSERT(nbblks > 0); 27 return BBTOB(nbblks) / sizeof(xfs_dqblk_t); 28 } 29 30 /* 31 * Do some primitive error checking on ondisk dquot data structures. 32 * 33 * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure; 34 * we verify them separately because at some points we have only the 35 * smaller xfs_disk_dquot structure available. 36 */ 37 38 xfs_failaddr_t 39 xfs_dquot_verify( 40 struct xfs_mount *mp, 41 xfs_disk_dquot_t *ddq, 42 xfs_dqid_t id, 43 uint type) /* used only during quotacheck */ 44 { 45 /* 46 * We can encounter an uninitialized dquot buffer for 2 reasons: 47 * 1. If we crash while deleting the quotainode(s), and those blks got 48 * used for user data. This is because we take the path of regular 49 * file deletion; however, the size field of quotainodes is never 50 * updated, so all the tricks that we play in itruncate_finish 51 * don't quite matter. 52 * 53 * 2. We don't play the quota buffers when there's a quotaoff logitem. 54 * But the allocation will be replayed so we'll end up with an 55 * uninitialized quota block. 56 * 57 * This is all fine; things are still consistent, and we haven't lost 58 * any quota information. Just don't complain about bad dquot blks. 59 */ 60 if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) 61 return __this_address; 62 if (ddq->d_version != XFS_DQUOT_VERSION) 63 return __this_address; 64 65 if (type && ddq->d_flags != type) 66 return __this_address; 67 if (ddq->d_flags != XFS_DQ_USER && 68 ddq->d_flags != XFS_DQ_PROJ && 69 ddq->d_flags != XFS_DQ_GROUP) 70 return __this_address; 71 72 if (id != -1 && id != be32_to_cpu(ddq->d_id)) 73 return __this_address; 74 75 if (!ddq->d_id) 76 return NULL; 77 78 if (ddq->d_blk_softlimit && 79 be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) && 80 !ddq->d_btimer) 81 return __this_address; 82 83 if (ddq->d_ino_softlimit && 84 be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) && 85 !ddq->d_itimer) 86 return __this_address; 87 88 if (ddq->d_rtb_softlimit && 89 be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) && 90 !ddq->d_rtbtimer) 91 return __this_address; 92 93 return NULL; 94 } 95 96 xfs_failaddr_t 97 xfs_dqblk_verify( 98 struct xfs_mount *mp, 99 struct xfs_dqblk *dqb, 100 xfs_dqid_t id, 101 uint type) /* used only during quotacheck */ 102 { 103 if (xfs_sb_version_hascrc(&mp->m_sb) && 104 !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid)) 105 return __this_address; 106 107 return xfs_dquot_verify(mp, &dqb->dd_diskdq, id, type); 108 } 109 110 /* 111 * Do some primitive error checking on ondisk dquot data structures. 112 */ 113 int 114 xfs_dqblk_repair( 115 struct xfs_mount *mp, 116 struct xfs_dqblk *dqb, 117 xfs_dqid_t id, 118 uint type) 119 { 120 /* 121 * Typically, a repair is only requested by quotacheck. 122 */ 123 ASSERT(id != -1); 124 memset(dqb, 0, sizeof(xfs_dqblk_t)); 125 126 dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 127 dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION; 128 dqb->dd_diskdq.d_flags = type; 129 dqb->dd_diskdq.d_id = cpu_to_be32(id); 130 131 if (xfs_sb_version_hascrc(&mp->m_sb)) { 132 uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid); 133 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk), 134 XFS_DQUOT_CRC_OFF); 135 } 136 137 return 0; 138 } 139 140 STATIC bool 141 xfs_dquot_buf_verify_crc( 142 struct xfs_mount *mp, 143 struct xfs_buf *bp, 144 bool readahead) 145 { 146 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; 147 int ndquots; 148 int i; 149 150 if (!xfs_sb_version_hascrc(&mp->m_sb)) 151 return true; 152 153 /* 154 * if we are in log recovery, the quota subsystem has not been 155 * initialised so we have no quotainfo structure. In that case, we need 156 * to manually calculate the number of dquots in the buffer. 157 */ 158 if (mp->m_quotainfo) 159 ndquots = mp->m_quotainfo->qi_dqperchunk; 160 else 161 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 162 163 for (i = 0; i < ndquots; i++, d++) { 164 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), 165 XFS_DQUOT_CRC_OFF)) { 166 if (!readahead) 167 xfs_buf_verifier_error(bp, -EFSBADCRC, __func__, 168 d, sizeof(*d), __this_address); 169 return false; 170 } 171 } 172 return true; 173 } 174 175 STATIC xfs_failaddr_t 176 xfs_dquot_buf_verify( 177 struct xfs_mount *mp, 178 struct xfs_buf *bp, 179 bool readahead) 180 { 181 struct xfs_dqblk *dqb = bp->b_addr; 182 xfs_failaddr_t fa; 183 xfs_dqid_t id = 0; 184 int ndquots; 185 int i; 186 187 /* 188 * if we are in log recovery, the quota subsystem has not been 189 * initialised so we have no quotainfo structure. In that case, we need 190 * to manually calculate the number of dquots in the buffer. 191 */ 192 if (mp->m_quotainfo) 193 ndquots = mp->m_quotainfo->qi_dqperchunk; 194 else 195 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 196 197 /* 198 * On the first read of the buffer, verify that each dquot is valid. 199 * We don't know what the id of the dquot is supposed to be, just that 200 * they should be increasing monotonically within the buffer. If the 201 * first id is corrupt, then it will fail on the second dquot in the 202 * buffer so corruptions could point to the wrong dquot in this case. 203 */ 204 for (i = 0; i < ndquots; i++) { 205 struct xfs_disk_dquot *ddq; 206 207 ddq = &dqb[i].dd_diskdq; 208 209 if (i == 0) 210 id = be32_to_cpu(ddq->d_id); 211 212 fa = xfs_dqblk_verify(mp, &dqb[i], id + i, 0); 213 if (fa) { 214 if (!readahead) 215 xfs_buf_verifier_error(bp, -EFSCORRUPTED, 216 __func__, &dqb[i], 217 sizeof(struct xfs_dqblk), fa); 218 return fa; 219 } 220 } 221 222 return NULL; 223 } 224 225 static xfs_failaddr_t 226 xfs_dquot_buf_verify_struct( 227 struct xfs_buf *bp) 228 { 229 struct xfs_mount *mp = bp->b_target->bt_mount; 230 231 return xfs_dquot_buf_verify(mp, bp, false); 232 } 233 234 static void 235 xfs_dquot_buf_read_verify( 236 struct xfs_buf *bp) 237 { 238 struct xfs_mount *mp = bp->b_target->bt_mount; 239 240 if (!xfs_dquot_buf_verify_crc(mp, bp, false)) 241 return; 242 xfs_dquot_buf_verify(mp, bp, false); 243 } 244 245 /* 246 * readahead errors are silent and simply leave the buffer as !done so a real 247 * read will then be run with the xfs_dquot_buf_ops verifier. See 248 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than 249 * reporting the failure. 250 */ 251 static void 252 xfs_dquot_buf_readahead_verify( 253 struct xfs_buf *bp) 254 { 255 struct xfs_mount *mp = bp->b_target->bt_mount; 256 257 if (!xfs_dquot_buf_verify_crc(mp, bp, true) || 258 xfs_dquot_buf_verify(mp, bp, true) != NULL) { 259 xfs_buf_ioerror(bp, -EIO); 260 bp->b_flags &= ~XBF_DONE; 261 } 262 } 263 264 /* 265 * we don't calculate the CRC here as that is done when the dquot is flushed to 266 * the buffer after the update is done. This ensures that the dquot in the 267 * buffer always has an up-to-date CRC value. 268 */ 269 static void 270 xfs_dquot_buf_write_verify( 271 struct xfs_buf *bp) 272 { 273 struct xfs_mount *mp = bp->b_target->bt_mount; 274 275 xfs_dquot_buf_verify(mp, bp, false); 276 } 277 278 const struct xfs_buf_ops xfs_dquot_buf_ops = { 279 .name = "xfs_dquot", 280 .verify_read = xfs_dquot_buf_read_verify, 281 .verify_write = xfs_dquot_buf_write_verify, 282 .verify_struct = xfs_dquot_buf_verify_struct, 283 }; 284 285 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { 286 .name = "xfs_dquot_ra", 287 .verify_read = xfs_dquot_buf_readahead_verify, 288 .verify_write = xfs_dquot_buf_write_verify, 289 }; 290