1 /* 2 * Copyright (c) 2000-2006 Silicon Graphics, Inc. 3 * Copyright (c) 2013 Red Hat, Inc. 4 * All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it would be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 #include "xfs.h" 20 #include "xfs_fs.h" 21 #include "xfs_shared.h" 22 #include "xfs_format.h" 23 #include "xfs_log_format.h" 24 #include "xfs_trans_resv.h" 25 #include "xfs_mount.h" 26 #include "xfs_inode.h" 27 #include "xfs_quota.h" 28 #include "xfs_trans.h" 29 #include "xfs_qm.h" 30 #include "xfs_error.h" 31 #include "xfs_cksum.h" 32 #include "xfs_trace.h" 33 34 int 35 xfs_calc_dquots_per_chunk( 36 unsigned int nbblks) /* basic block units */ 37 { 38 ASSERT(nbblks > 0); 39 return BBTOB(nbblks) / sizeof(xfs_dqblk_t); 40 } 41 42 /* 43 * Do some primitive error checking on ondisk dquot data structures. 44 * 45 * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure; 46 * we verify them separately because at some points we have only the 47 * smaller xfs_disk_dquot structure available. 48 */ 49 50 xfs_failaddr_t 51 xfs_dquot_verify( 52 struct xfs_mount *mp, 53 xfs_disk_dquot_t *ddq, 54 xfs_dqid_t id, 55 uint type) /* used only during quotacheck */ 56 { 57 /* 58 * We can encounter an uninitialized dquot buffer for 2 reasons: 59 * 1. If we crash while deleting the quotainode(s), and those blks got 60 * used for user data. This is because we take the path of regular 61 * file deletion; however, the size field of quotainodes is never 62 * updated, so all the tricks that we play in itruncate_finish 63 * don't quite matter. 64 * 65 * 2. We don't play the quota buffers when there's a quotaoff logitem. 66 * But the allocation will be replayed so we'll end up with an 67 * uninitialized quota block. 68 * 69 * This is all fine; things are still consistent, and we haven't lost 70 * any quota information. Just don't complain about bad dquot blks. 71 */ 72 if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) 73 return __this_address; 74 if (ddq->d_version != XFS_DQUOT_VERSION) 75 return __this_address; 76 77 if (type && ddq->d_flags != type) 78 return __this_address; 79 if (ddq->d_flags != XFS_DQ_USER && 80 ddq->d_flags != XFS_DQ_PROJ && 81 ddq->d_flags != XFS_DQ_GROUP) 82 return __this_address; 83 84 if (id != -1 && id != be32_to_cpu(ddq->d_id)) 85 return __this_address; 86 87 if (!ddq->d_id) 88 return NULL; 89 90 if (ddq->d_blk_softlimit && 91 be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) && 92 !ddq->d_btimer) 93 return __this_address; 94 95 if (ddq->d_ino_softlimit && 96 be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) && 97 !ddq->d_itimer) 98 return __this_address; 99 100 if (ddq->d_rtb_softlimit && 101 be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) && 102 !ddq->d_rtbtimer) 103 return __this_address; 104 105 return NULL; 106 } 107 108 xfs_failaddr_t 109 xfs_dqblk_verify( 110 struct xfs_mount *mp, 111 struct xfs_dqblk *dqb, 112 xfs_dqid_t id, 113 uint type) /* used only during quotacheck */ 114 { 115 if (xfs_sb_version_hascrc(&mp->m_sb) && 116 !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid)) 117 return __this_address; 118 119 return xfs_dquot_verify(mp, &dqb->dd_diskdq, id, type); 120 } 121 122 /* 123 * Do some primitive error checking on ondisk dquot data structures. 124 */ 125 int 126 xfs_dqblk_repair( 127 struct xfs_mount *mp, 128 struct xfs_dqblk *dqb, 129 xfs_dqid_t id, 130 uint type) 131 { 132 /* 133 * Typically, a repair is only requested by quotacheck. 134 */ 135 ASSERT(id != -1); 136 memset(dqb, 0, sizeof(xfs_dqblk_t)); 137 138 dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 139 dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION; 140 dqb->dd_diskdq.d_flags = type; 141 dqb->dd_diskdq.d_id = cpu_to_be32(id); 142 143 if (xfs_sb_version_hascrc(&mp->m_sb)) { 144 uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid); 145 xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk), 146 XFS_DQUOT_CRC_OFF); 147 } 148 149 return 0; 150 } 151 152 STATIC bool 153 xfs_dquot_buf_verify_crc( 154 struct xfs_mount *mp, 155 struct xfs_buf *bp, 156 bool readahead) 157 { 158 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; 159 int ndquots; 160 int i; 161 162 if (!xfs_sb_version_hascrc(&mp->m_sb)) 163 return true; 164 165 /* 166 * if we are in log recovery, the quota subsystem has not been 167 * initialised so we have no quotainfo structure. In that case, we need 168 * to manually calculate the number of dquots in the buffer. 169 */ 170 if (mp->m_quotainfo) 171 ndquots = mp->m_quotainfo->qi_dqperchunk; 172 else 173 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 174 175 for (i = 0; i < ndquots; i++, d++) { 176 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), 177 XFS_DQUOT_CRC_OFF)) { 178 if (!readahead) 179 xfs_buf_verifier_error(bp, -EFSBADCRC, __func__, 180 d, sizeof(*d), __this_address); 181 return false; 182 } 183 } 184 return true; 185 } 186 187 STATIC xfs_failaddr_t 188 xfs_dquot_buf_verify( 189 struct xfs_mount *mp, 190 struct xfs_buf *bp, 191 bool readahead) 192 { 193 struct xfs_dqblk *dqb = bp->b_addr; 194 xfs_failaddr_t fa; 195 xfs_dqid_t id = 0; 196 int ndquots; 197 int i; 198 199 /* 200 * if we are in log recovery, the quota subsystem has not been 201 * initialised so we have no quotainfo structure. In that case, we need 202 * to manually calculate the number of dquots in the buffer. 203 */ 204 if (mp->m_quotainfo) 205 ndquots = mp->m_quotainfo->qi_dqperchunk; 206 else 207 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 208 209 /* 210 * On the first read of the buffer, verify that each dquot is valid. 211 * We don't know what the id of the dquot is supposed to be, just that 212 * they should be increasing monotonically within the buffer. If the 213 * first id is corrupt, then it will fail on the second dquot in the 214 * buffer so corruptions could point to the wrong dquot in this case. 215 */ 216 for (i = 0; i < ndquots; i++) { 217 struct xfs_disk_dquot *ddq; 218 219 ddq = &dqb[i].dd_diskdq; 220 221 if (i == 0) 222 id = be32_to_cpu(ddq->d_id); 223 224 fa = xfs_dqblk_verify(mp, &dqb[i], id + i, 0); 225 if (fa) { 226 if (!readahead) 227 xfs_buf_verifier_error(bp, -EFSCORRUPTED, 228 __func__, &dqb[i], 229 sizeof(struct xfs_dqblk), fa); 230 return fa; 231 } 232 } 233 234 return NULL; 235 } 236 237 static xfs_failaddr_t 238 xfs_dquot_buf_verify_struct( 239 struct xfs_buf *bp) 240 { 241 struct xfs_mount *mp = bp->b_target->bt_mount; 242 243 return xfs_dquot_buf_verify(mp, bp, false); 244 } 245 246 static void 247 xfs_dquot_buf_read_verify( 248 struct xfs_buf *bp) 249 { 250 struct xfs_mount *mp = bp->b_target->bt_mount; 251 252 if (!xfs_dquot_buf_verify_crc(mp, bp, false)) 253 return; 254 xfs_dquot_buf_verify(mp, bp, false); 255 } 256 257 /* 258 * readahead errors are silent and simply leave the buffer as !done so a real 259 * read will then be run with the xfs_dquot_buf_ops verifier. See 260 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than 261 * reporting the failure. 262 */ 263 static void 264 xfs_dquot_buf_readahead_verify( 265 struct xfs_buf *bp) 266 { 267 struct xfs_mount *mp = bp->b_target->bt_mount; 268 269 if (!xfs_dquot_buf_verify_crc(mp, bp, true) || 270 xfs_dquot_buf_verify(mp, bp, true) != NULL) { 271 xfs_buf_ioerror(bp, -EIO); 272 bp->b_flags &= ~XBF_DONE; 273 } 274 } 275 276 /* 277 * we don't calculate the CRC here as that is done when the dquot is flushed to 278 * the buffer after the update is done. This ensures that the dquot in the 279 * buffer always has an up-to-date CRC value. 280 */ 281 static void 282 xfs_dquot_buf_write_verify( 283 struct xfs_buf *bp) 284 { 285 struct xfs_mount *mp = bp->b_target->bt_mount; 286 287 xfs_dquot_buf_verify(mp, bp, false); 288 } 289 290 const struct xfs_buf_ops xfs_dquot_buf_ops = { 291 .name = "xfs_dquot", 292 .verify_read = xfs_dquot_buf_read_verify, 293 .verify_write = xfs_dquot_buf_write_verify, 294 .verify_struct = xfs_dquot_buf_verify_struct, 295 }; 296 297 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { 298 .name = "xfs_dquot_ra", 299 .verify_read = xfs_dquot_buf_readahead_verify, 300 .verify_write = xfs_dquot_buf_write_verify, 301 }; 302