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 unsigned int ndquots; 39 40 ASSERT(nbblks > 0); 41 ndquots = BBTOB(nbblks); 42 do_div(ndquots, sizeof(xfs_dqblk_t)); 43 44 return ndquots; 45 } 46 47 /* 48 * Do some primitive error checking on ondisk dquot data structures. 49 */ 50 int 51 xfs_dqcheck( 52 struct xfs_mount *mp, 53 xfs_disk_dquot_t *ddq, 54 xfs_dqid_t id, 55 uint type, /* used only when IO_dorepair is true */ 56 uint flags, 57 const char *str) 58 { 59 xfs_dqblk_t *d = (xfs_dqblk_t *)ddq; 60 int errs = 0; 61 62 /* 63 * We can encounter an uninitialized dquot buffer for 2 reasons: 64 * 1. If we crash while deleting the quotainode(s), and those blks got 65 * used for user data. This is because we take the path of regular 66 * file deletion; however, the size field of quotainodes is never 67 * updated, so all the tricks that we play in itruncate_finish 68 * don't quite matter. 69 * 70 * 2. We don't play the quota buffers when there's a quotaoff logitem. 71 * But the allocation will be replayed so we'll end up with an 72 * uninitialized quota block. 73 * 74 * This is all fine; things are still consistent, and we haven't lost 75 * any quota information. Just don't complain about bad dquot blks. 76 */ 77 if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) { 78 if (flags & XFS_QMOPT_DOWARN) 79 xfs_alert(mp, 80 "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x", 81 str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC); 82 errs++; 83 } 84 if (ddq->d_version != XFS_DQUOT_VERSION) { 85 if (flags & XFS_QMOPT_DOWARN) 86 xfs_alert(mp, 87 "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x", 88 str, id, ddq->d_version, XFS_DQUOT_VERSION); 89 errs++; 90 } 91 92 if (ddq->d_flags != XFS_DQ_USER && 93 ddq->d_flags != XFS_DQ_PROJ && 94 ddq->d_flags != XFS_DQ_GROUP) { 95 if (flags & XFS_QMOPT_DOWARN) 96 xfs_alert(mp, 97 "%s : XFS dquot ID 0x%x, unknown flags 0x%x", 98 str, id, ddq->d_flags); 99 errs++; 100 } 101 102 if (id != -1 && id != be32_to_cpu(ddq->d_id)) { 103 if (flags & XFS_QMOPT_DOWARN) 104 xfs_alert(mp, 105 "%s : ondisk-dquot 0x%p, ID mismatch: " 106 "0x%x expected, found id 0x%x", 107 str, ddq, id, be32_to_cpu(ddq->d_id)); 108 errs++; 109 } 110 111 if (!errs && ddq->d_id) { 112 if (ddq->d_blk_softlimit && 113 be64_to_cpu(ddq->d_bcount) > 114 be64_to_cpu(ddq->d_blk_softlimit)) { 115 if (!ddq->d_btimer) { 116 if (flags & XFS_QMOPT_DOWARN) 117 xfs_alert(mp, 118 "%s : Dquot ID 0x%x (0x%p) BLK TIMER NOT STARTED", 119 str, (int)be32_to_cpu(ddq->d_id), ddq); 120 errs++; 121 } 122 } 123 if (ddq->d_ino_softlimit && 124 be64_to_cpu(ddq->d_icount) > 125 be64_to_cpu(ddq->d_ino_softlimit)) { 126 if (!ddq->d_itimer) { 127 if (flags & XFS_QMOPT_DOWARN) 128 xfs_alert(mp, 129 "%s : Dquot ID 0x%x (0x%p) INODE TIMER NOT STARTED", 130 str, (int)be32_to_cpu(ddq->d_id), ddq); 131 errs++; 132 } 133 } 134 if (ddq->d_rtb_softlimit && 135 be64_to_cpu(ddq->d_rtbcount) > 136 be64_to_cpu(ddq->d_rtb_softlimit)) { 137 if (!ddq->d_rtbtimer) { 138 if (flags & XFS_QMOPT_DOWARN) 139 xfs_alert(mp, 140 "%s : Dquot ID 0x%x (0x%p) RTBLK TIMER NOT STARTED", 141 str, (int)be32_to_cpu(ddq->d_id), ddq); 142 errs++; 143 } 144 } 145 } 146 147 if (!errs || !(flags & XFS_QMOPT_DQREPAIR)) 148 return errs; 149 150 if (flags & XFS_QMOPT_DOWARN) 151 xfs_notice(mp, "Re-initializing dquot ID 0x%x", id); 152 153 /* 154 * Typically, a repair is only requested by quotacheck. 155 */ 156 ASSERT(id != -1); 157 ASSERT(flags & XFS_QMOPT_DQREPAIR); 158 memset(d, 0, sizeof(xfs_dqblk_t)); 159 160 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); 161 d->dd_diskdq.d_version = XFS_DQUOT_VERSION; 162 d->dd_diskdq.d_flags = type; 163 d->dd_diskdq.d_id = cpu_to_be32(id); 164 165 if (xfs_sb_version_hascrc(&mp->m_sb)) { 166 uuid_copy(&d->dd_uuid, &mp->m_sb.sb_meta_uuid); 167 xfs_update_cksum((char *)d, sizeof(struct xfs_dqblk), 168 XFS_DQUOT_CRC_OFF); 169 } 170 171 return errs; 172 } 173 174 STATIC bool 175 xfs_dquot_buf_verify_crc( 176 struct xfs_mount *mp, 177 struct xfs_buf *bp) 178 { 179 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; 180 int ndquots; 181 int i; 182 183 if (!xfs_sb_version_hascrc(&mp->m_sb)) 184 return true; 185 186 /* 187 * if we are in log recovery, the quota subsystem has not been 188 * initialised so we have no quotainfo structure. In that case, we need 189 * to manually calculate the number of dquots in the buffer. 190 */ 191 if (mp->m_quotainfo) 192 ndquots = mp->m_quotainfo->qi_dqperchunk; 193 else 194 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 195 196 for (i = 0; i < ndquots; i++, d++) { 197 if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), 198 XFS_DQUOT_CRC_OFF)) 199 return false; 200 if (!uuid_equal(&d->dd_uuid, &mp->m_sb.sb_meta_uuid)) 201 return false; 202 } 203 return true; 204 } 205 206 STATIC bool 207 xfs_dquot_buf_verify( 208 struct xfs_mount *mp, 209 struct xfs_buf *bp, 210 int warn) 211 { 212 struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; 213 xfs_dqid_t id = 0; 214 int ndquots; 215 int i; 216 217 /* 218 * if we are in log recovery, the quota subsystem has not been 219 * initialised so we have no quotainfo structure. In that case, we need 220 * to manually calculate the number of dquots in the buffer. 221 */ 222 if (mp->m_quotainfo) 223 ndquots = mp->m_quotainfo->qi_dqperchunk; 224 else 225 ndquots = xfs_calc_dquots_per_chunk(bp->b_length); 226 227 /* 228 * On the first read of the buffer, verify that each dquot is valid. 229 * We don't know what the id of the dquot is supposed to be, just that 230 * they should be increasing monotonically within the buffer. If the 231 * first id is corrupt, then it will fail on the second dquot in the 232 * buffer so corruptions could point to the wrong dquot in this case. 233 */ 234 for (i = 0; i < ndquots; i++) { 235 struct xfs_disk_dquot *ddq; 236 int error; 237 238 ddq = &d[i].dd_diskdq; 239 240 if (i == 0) 241 id = be32_to_cpu(ddq->d_id); 242 243 error = xfs_dqcheck(mp, ddq, id + i, 0, warn, __func__); 244 if (error) 245 return false; 246 } 247 return true; 248 } 249 250 static void 251 xfs_dquot_buf_read_verify( 252 struct xfs_buf *bp) 253 { 254 struct xfs_mount *mp = bp->b_target->bt_mount; 255 256 if (!xfs_dquot_buf_verify_crc(mp, bp)) 257 xfs_buf_ioerror(bp, -EFSBADCRC); 258 else if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) 259 xfs_buf_ioerror(bp, -EFSCORRUPTED); 260 261 if (bp->b_error) 262 xfs_verifier_error(bp); 263 } 264 265 /* 266 * readahead errors are silent and simply leave the buffer as !done so a real 267 * read will then be run with the xfs_dquot_buf_ops verifier. See 268 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than 269 * reporting the failure. 270 */ 271 static void 272 xfs_dquot_buf_readahead_verify( 273 struct xfs_buf *bp) 274 { 275 struct xfs_mount *mp = bp->b_target->bt_mount; 276 277 if (!xfs_dquot_buf_verify_crc(mp, bp) || 278 !xfs_dquot_buf_verify(mp, bp, 0)) { 279 xfs_buf_ioerror(bp, -EIO); 280 bp->b_flags &= ~XBF_DONE; 281 } 282 } 283 284 /* 285 * we don't calculate the CRC here as that is done when the dquot is flushed to 286 * the buffer after the update is done. This ensures that the dquot in the 287 * buffer always has an up-to-date CRC value. 288 */ 289 static void 290 xfs_dquot_buf_write_verify( 291 struct xfs_buf *bp) 292 { 293 struct xfs_mount *mp = bp->b_target->bt_mount; 294 295 if (!xfs_dquot_buf_verify(mp, bp, XFS_QMOPT_DOWARN)) { 296 xfs_buf_ioerror(bp, -EFSCORRUPTED); 297 xfs_verifier_error(bp); 298 return; 299 } 300 } 301 302 const struct xfs_buf_ops xfs_dquot_buf_ops = { 303 .name = "xfs_dquot", 304 .verify_read = xfs_dquot_buf_read_verify, 305 .verify_write = xfs_dquot_buf_write_verify, 306 }; 307 308 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { 309 .name = "xfs_dquot_ra", 310 .verify_read = xfs_dquot_buf_readahead_verify, 311 .verify_write = xfs_dquot_buf_write_verify, 312 }; 313