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 int 46 xfs_dqcheck( 47 struct xfs_mount *mp, 48 xfs_disk_dquot_t *ddq, 49 xfs_dqid_t id, 50 uint type, /* used only when IO_dorepair is true */ 51 uint flags, 52 const char *str) 53 { 54 xfs_dqblk_t *d = (xfs_dqblk_t *)ddq; 55 int errs = 0; 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 if (flags & XFS_QMOPT_DOWARN) 74 xfs_alert(mp, 75 "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x", 76 str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC); 77 errs++; 78 } 79 if (ddq->d_version != XFS_DQUOT_VERSION) { 80 if (flags & XFS_QMOPT_DOWARN) 81 xfs_alert(mp, 82 "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x", 83 str, id, ddq->d_version, XFS_DQUOT_VERSION); 84 errs++; 85 } 86 87 if (ddq->d_flags != XFS_DQ_USER && 88 ddq->d_flags != XFS_DQ_PROJ && 89 ddq->d_flags != XFS_DQ_GROUP) { 90 if (flags & XFS_QMOPT_DOWARN) 91 xfs_alert(mp, 92 "%s : XFS dquot ID 0x%x, unknown flags 0x%x", 93 str, id, ddq->d_flags); 94 errs++; 95 } 96 97 if (id != -1 && id != be32_to_cpu(ddq->d_id)) { 98 if (flags & XFS_QMOPT_DOWARN) 99 xfs_alert(mp, 100 "%s : ondisk-dquot 0x%p, ID mismatch: " 101 "0x%x expected, found id 0x%x", 102 str, ddq, id, be32_to_cpu(ddq->d_id)); 103 errs++; 104 } 105 106 if (!errs && ddq->d_id) { 107 if (ddq->d_blk_softlimit && 108 be64_to_cpu(ddq->d_bcount) > 109 be64_to_cpu(ddq->d_blk_softlimit)) { 110 if (!ddq->d_btimer) { 111 if (flags & XFS_QMOPT_DOWARN) 112 xfs_alert(mp, 113 "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED", 114 str, (int)be32_to_cpu(ddq->d_id), ddq); 115 errs++; 116 } 117 } 118 if (ddq->d_ino_softlimit && 119 be64_to_cpu(ddq->d_icount) > 120 be64_to_cpu(ddq->d_ino_softlimit)) { 121 if (!ddq->d_itimer) { 122 if (flags & XFS_QMOPT_DOWARN) 123 xfs_alert(mp, 124 "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED", 125 str, (int)be32_to_cpu(ddq->d_id), ddq); 126 errs++; 127 } 128 } 129 if (ddq->d_rtb_softlimit && 130 be64_to_cpu(ddq->d_rtbcount) > 131 be64_to_cpu(ddq->d_rtb_softlimit)) { 132 if (!ddq->d_rtbtimer) { 133 if (flags & XFS_QMOPT_DOWARN) 134 xfs_alert(mp, 135 "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED", 136 str, (int)be32_to_cpu(ddq->d_id), ddq); 137 errs++; 138 } 139 } 140 } 141 142 if (!errs || !(flags & XFS_QMOPT_DQREPAIR)) 143 return errs; 144 145 if (flags & XFS_QMOPT_DOWARN) 146 xfs_notice(mp, "Re-initializing dquot ID 0x%x", id); 147 148 /* 149 * Typically, a repair is only requested by quotacheck. 150 */ 151 ASSERT(id != -1); 152 ASSERT(flags & XFS_QMOPT_DQREPAIR); 153 memset(d, 0, sizeof(xfs_dqblk_t)); 154 155 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 156 d->dd_diskdq.d_version = XFS_DQUOT_VERSION; 157 d->dd_diskdq.d_flags = type; 158 d->dd_diskdq.d_id = cpu_to_be32(id); 159 160 if (xfs_sb_version_hascrc(&mp->m_sb)) { 161 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid); 162 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), 163 XFS_DQUOT_CRC_OFF); 164 } 165 166 return errs; 167 } 168 169 STATIC bool 170 xfs_dquot_buf_verify_crc( 171 struct xfs_mount *mp, 172 struct xfs_buf *bp) 173 { 174 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; 175 int ndquots; 176 int i; 177 178 if (!xfs_sb_version_hascrc(&mp->m_sb)) 179 return true; 180 181 /* 182 * if we are in log recovery, the quota subsystem has not been 183 * initialised so we have no quotainfo structure. In that case, we need 184 * to manually calculate the number of dquots in the buffer. 185 */ 186 if (mp->m_quotainfo) 187 ndquots = mp->m_quotainfo->qi_dqperchunk; 188 else 189 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 190 191 for (i = 0; i < ndquots; i++, d++) { 192 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), 193 XFS_DQUOT_CRC_OFF)) 194 return false; 195 if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_meta_uuid)) 196 return false; 197 } 198 return true; 199 } 200 201 STATIC bool 202 xfs_dquot_buf_verify( 203 struct xfs_mount *mp, 204 struct xfs_buf *bp, 205 int warn) 206 { 207 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; 208 xfs_dqid_t id = 0; 209 int ndquots; 210 int i; 211 212 /* 213 * if we are in log recovery, the quota subsystem has not been 214 * initialised so we have no quotainfo structure. In that case, we need 215 * to manually calculate the number of dquots in the buffer. 216 */ 217 if (mp->m_quotainfo) 218 ndquots = mp->m_quotainfo->qi_dqperchunk; 219 else 220 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 221 222 /* 223 * On the first read of the buffer, verify that each dquot is valid. 224 * We don't know what the id of the dquot is supposed to be, just that 225 * they should be increasing monotonically within the buffer. If the 226 * first id is corrupt, then it will fail on the second dquot in the 227 * buffer so corruptions could point to the wrong dquot in this case. 228 */ 229 for (i = 0; i < ndquots; i++) { 230 struct xfs_disk_dquot *ddq; 231 int error; 232 233 ddq = &d[i].dd_diskdq; 234 235 if (i == 0) 236 id = be32_to_cpu(ddq->d_id); 237 238 error = xfs_dqcheck(mp, ddq, id + i, 0, warn, __func__); 239 if (error) 240 return false; 241 } 242 return true; 243 } 244 245 static void 246 xfs_dquot_buf_read_verify( 247 struct xfs_buf *bp) 248 { 249 struct xfs_mount *mp = bp->b_target->bt_mount; 250 251 if (!xfs_dquot_buf_verify_crc(mp, bp)) 252 xfs_buf_ioerror(bp, -EFSBADCRC); 253 else if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) 254 xfs_buf_ioerror(bp, -EFSCORRUPTED); 255 256 if (bp->b_error) 257 xfs_verifier_error(bp); 258 } 259 260 /* 261 * readahead errors are silent and simply leave the buffer as !done so a real 262 * read will then be run with the xfs_dquot_buf_ops verifier. See 263 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than 264 * reporting the failure. 265 */ 266 static void 267 xfs_dquot_buf_readahead_verify( 268 struct xfs_buf *bp) 269 { 270 struct xfs_mount *mp = bp->b_target->bt_mount; 271 272 if (!xfs_dquot_buf_verify_crc(mp, bp) || 273 !xfs_dquot_buf_verify(mp, bp, 0)) { 274 xfs_buf_ioerror(bp, -EIO); 275 bp->b_flags &= ~XBF_DONE; 276 } 277 } 278 279 /* 280 * we don't calculate the CRC here as that is done when the dquot is flushed to 281 * the buffer after the update is done. This ensures that the dquot in the 282 * buffer always has an up-to-date CRC value. 283 */ 284 static void 285 xfs_dquot_buf_write_verify( 286 struct xfs_buf *bp) 287 { 288 struct xfs_mount *mp = bp->b_target->bt_mount; 289 290 if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) { 291 xfs_buf_ioerror(bp, -EFSCORRUPTED); 292 xfs_verifier_error(bp); 293 return; 294 } 295 } 296 297 const struct xfs_buf_ops xfs_dquot_buf_ops = { 298 .name = "xfs_dquot", 299 .verify_read = xfs_dquot_buf_read_verify, 300 .verify_write = xfs_dquot_buf_write_verify, 301 }; 302 303 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { 304 .name = "xfs_dquot_ra", 305 .verify_read = xfs_dquot_buf_readahead_verify, 306 .verify_write = xfs_dquot_buf_write_verify, 307 }; 308