Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 3 | * Copyright (c) 2013 Red Hat, Inc. |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 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_types.h" |
| 22 | #include "xfs_bit.h" |
| 23 | #include "xfs_log.h" |
| 24 | #include "xfs_trans.h" |
| 25 | #include "xfs_sb.h" |
| 26 | #include "xfs_ag.h" |
| 27 | #include "xfs_mount.h" |
| 28 | #include "xfs_error.h" |
| 29 | #include "xfs_da_btree.h" |
| 30 | #include "xfs_bmap_btree.h" |
| 31 | #include "xfs_dinode.h" |
| 32 | #include "xfs_inode.h" |
| 33 | #include "xfs_alloc.h" |
| 34 | #include "xfs_inode_item.h" |
| 35 | #include "xfs_bmap.h" |
| 36 | #include "xfs_attr.h" |
| 37 | #include "xfs_attr_leaf.h" |
| 38 | #include "xfs_attr_remote.h" |
| 39 | #include "xfs_trans_space.h" |
| 40 | #include "xfs_trace.h" |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 41 | #include "xfs_cksum.h" |
| 42 | #include "xfs_buf_item.h" |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 43 | |
| 44 | #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ |
| 45 | |
| 46 | /* |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 47 | * Each contiguous block has a header, so it is not just a simple attribute |
| 48 | * length to FSB conversion. |
| 49 | */ |
| 50 | static int |
| 51 | xfs_attr3_rmt_blocks( |
| 52 | struct xfs_mount *mp, |
| 53 | int attrlen) |
| 54 | { |
| 55 | int fsblocks = 0; |
| 56 | int len = attrlen; |
| 57 | |
| 58 | do { |
| 59 | fsblocks++; |
| 60 | len -= XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); |
| 61 | } while (len > 0); |
| 62 | |
| 63 | return fsblocks; |
| 64 | } |
| 65 | |
| 66 | static bool |
| 67 | xfs_attr3_rmt_verify( |
| 68 | struct xfs_buf *bp) |
| 69 | { |
| 70 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 71 | struct xfs_attr3_rmt_hdr *rmt = bp->b_addr; |
| 72 | |
| 73 | if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| 74 | return false; |
| 75 | if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC)) |
| 76 | return false; |
| 77 | if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid)) |
| 78 | return false; |
| 79 | if (bp->b_bn != be64_to_cpu(rmt->rm_blkno)) |
| 80 | return false; |
| 81 | if (be32_to_cpu(rmt->rm_offset) + |
| 82 | be32_to_cpu(rmt->rm_bytes) >= MAXPATHLEN) |
| 83 | return false; |
| 84 | if (rmt->rm_owner == 0) |
| 85 | return false; |
| 86 | |
| 87 | return true; |
| 88 | } |
| 89 | |
| 90 | static void |
| 91 | xfs_attr3_rmt_read_verify( |
| 92 | struct xfs_buf *bp) |
| 93 | { |
| 94 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 95 | |
| 96 | /* no verification of non-crc buffers */ |
| 97 | if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| 98 | return; |
| 99 | |
| 100 | if (!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), |
| 101 | XFS_ATTR3_RMT_CRC_OFF) || |
| 102 | !xfs_attr3_rmt_verify(bp)) { |
| 103 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
| 104 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static void |
| 109 | xfs_attr3_rmt_write_verify( |
| 110 | struct xfs_buf *bp) |
| 111 | { |
| 112 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 113 | struct xfs_buf_log_item *bip = bp->b_fspriv; |
| 114 | |
| 115 | /* no verification of non-crc buffers */ |
| 116 | if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| 117 | return; |
| 118 | |
| 119 | if (!xfs_attr3_rmt_verify(bp)) { |
| 120 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); |
| 121 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
| 122 | return; |
| 123 | } |
| 124 | |
| 125 | if (bip) { |
| 126 | struct xfs_attr3_rmt_hdr *rmt = bp->b_addr; |
| 127 | rmt->rm_lsn = cpu_to_be64(bip->bli_item.li_lsn); |
| 128 | } |
| 129 | xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), |
| 130 | XFS_ATTR3_RMT_CRC_OFF); |
| 131 | } |
| 132 | |
| 133 | const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = { |
| 134 | .verify_read = xfs_attr3_rmt_read_verify, |
| 135 | .verify_write = xfs_attr3_rmt_write_verify, |
| 136 | }; |
| 137 | |
| 138 | static int |
| 139 | xfs_attr3_rmt_hdr_set( |
| 140 | struct xfs_mount *mp, |
| 141 | xfs_ino_t ino, |
| 142 | uint32_t offset, |
| 143 | uint32_t size, |
| 144 | struct xfs_buf *bp) |
| 145 | { |
| 146 | struct xfs_attr3_rmt_hdr *rmt = bp->b_addr; |
| 147 | |
| 148 | if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| 149 | return 0; |
| 150 | |
| 151 | rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); |
| 152 | rmt->rm_offset = cpu_to_be32(offset); |
| 153 | rmt->rm_bytes = cpu_to_be32(size); |
| 154 | uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid); |
| 155 | rmt->rm_owner = cpu_to_be64(ino); |
| 156 | rmt->rm_blkno = cpu_to_be64(bp->b_bn); |
| 157 | bp->b_ops = &xfs_attr3_rmt_buf_ops; |
| 158 | |
| 159 | return sizeof(struct xfs_attr3_rmt_hdr); |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Checking of the remote attribute header is split into two parts. the verifier |
| 164 | * does CRC, location and bounds checking, the unpacking function checks the |
| 165 | * attribute parameters and owner. |
| 166 | */ |
| 167 | static bool |
| 168 | xfs_attr3_rmt_hdr_ok( |
| 169 | struct xfs_mount *mp, |
| 170 | xfs_ino_t ino, |
| 171 | uint32_t offset, |
| 172 | uint32_t size, |
| 173 | struct xfs_buf *bp) |
| 174 | { |
| 175 | struct xfs_attr3_rmt_hdr *rmt = bp->b_addr; |
| 176 | |
| 177 | if (offset != be32_to_cpu(rmt->rm_offset)) |
| 178 | return false; |
| 179 | if (size != be32_to_cpu(rmt->rm_bytes)) |
| 180 | return false; |
| 181 | if (ino != be64_to_cpu(rmt->rm_owner)) |
| 182 | return false; |
| 183 | |
| 184 | /* ok */ |
| 185 | return true; |
| 186 | |
| 187 | } |
| 188 | |
| 189 | /* |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 190 | * Read the value associated with an attribute from the out-of-line buffer |
| 191 | * that we stored it in. |
| 192 | */ |
| 193 | int |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 194 | xfs_attr_rmtval_get( |
| 195 | struct xfs_da_args *args) |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 196 | { |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 197 | struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; |
| 198 | struct xfs_mount *mp = args->dp->i_mount; |
| 199 | struct xfs_buf *bp; |
| 200 | xfs_daddr_t dblkno; |
| 201 | xfs_dablk_t lblkno = args->rmtblkno; |
| 202 | void *dst = args->value; |
| 203 | int valuelen = args->valuelen; |
| 204 | int nmap; |
| 205 | int error; |
| 206 | int blkcnt; |
| 207 | int i; |
| 208 | int offset = 0; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 209 | |
| 210 | trace_xfs_attr_rmtval_get(args); |
| 211 | |
| 212 | ASSERT(!(args->flags & ATTR_KERNOVAL)); |
| 213 | |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 214 | while (valuelen > 0) { |
| 215 | nmap = ATTR_RMTVALUE_MAPSIZE; |
| 216 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, |
| 217 | args->rmtblkcnt, map, &nmap, |
| 218 | XFS_BMAPI_ATTRFORK); |
| 219 | if (error) |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 220 | return error; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 221 | ASSERT(nmap >= 1); |
| 222 | |
| 223 | for (i = 0; (i < nmap) && (valuelen > 0); i++) { |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 224 | int byte_cnt; |
| 225 | char *src; |
| 226 | |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 227 | ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && |
| 228 | (map[i].br_startblock != HOLESTARTBLOCK)); |
| 229 | dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); |
| 230 | blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); |
| 231 | error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 232 | dblkno, blkcnt, 0, &bp, |
| 233 | &xfs_attr3_rmt_buf_ops); |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 234 | if (error) |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 235 | return error; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 236 | |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 237 | byte_cnt = min_t(int, valuelen, BBTOB(bp->b_length)); |
| 238 | byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, byte_cnt); |
| 239 | |
| 240 | src = bp->b_addr; |
| 241 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| 242 | if (!xfs_attr3_rmt_hdr_ok(mp, args->dp->i_ino, |
| 243 | offset, byte_cnt, bp)) { |
| 244 | xfs_alert(mp, |
| 245 | "remote attribute header does not match required off/len/owner (0x%x/Ox%x,0x%llx)", |
| 246 | offset, byte_cnt, args->dp->i_ino); |
| 247 | xfs_buf_relse(bp); |
| 248 | return EFSCORRUPTED; |
| 249 | |
| 250 | } |
| 251 | |
| 252 | src += sizeof(struct xfs_attr3_rmt_hdr); |
| 253 | } |
| 254 | |
| 255 | memcpy(dst, src, byte_cnt); |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 256 | xfs_buf_relse(bp); |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 257 | |
| 258 | offset += byte_cnt; |
| 259 | dst += byte_cnt; |
| 260 | valuelen -= byte_cnt; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 261 | |
| 262 | lblkno += map[i].br_blockcount; |
| 263 | } |
| 264 | } |
| 265 | ASSERT(valuelen == 0); |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 266 | return 0; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Write the value associated with an attribute into the out-of-line buffer |
| 271 | * that we have defined for it. |
| 272 | */ |
| 273 | int |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 274 | xfs_attr_rmtval_set( |
| 275 | struct xfs_da_args *args) |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 276 | { |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 277 | struct xfs_inode *dp = args->dp; |
| 278 | struct xfs_mount *mp = dp->i_mount; |
| 279 | struct xfs_bmbt_irec map; |
| 280 | struct xfs_buf *bp; |
| 281 | xfs_daddr_t dblkno; |
| 282 | xfs_dablk_t lblkno; |
| 283 | xfs_fileoff_t lfileoff = 0; |
| 284 | void *src = args->value; |
| 285 | int blkcnt; |
| 286 | int valuelen; |
| 287 | int nmap; |
| 288 | int error; |
| 289 | int hdrcnt = 0; |
| 290 | bool crcs = xfs_sb_version_hascrc(&mp->m_sb); |
| 291 | int offset = 0; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 292 | |
| 293 | trace_xfs_attr_rmtval_set(args); |
| 294 | |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 295 | /* |
| 296 | * Find a "hole" in the attribute address space large enough for |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 297 | * us to drop the new attribute's value into. Because CRC enable |
| 298 | * attributes have headers, we can't just do a straight byte to FSB |
| 299 | * conversion. We calculate the worst case block count in this case |
| 300 | * and we may not need that many, so we have to handle this when |
| 301 | * allocating the blocks below. |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 302 | */ |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 303 | if (!crcs) |
| 304 | blkcnt = XFS_B_TO_FSB(mp, args->valuelen); |
| 305 | else |
| 306 | blkcnt = xfs_attr3_rmt_blocks(mp, args->valuelen); |
| 307 | |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 308 | error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, |
| 309 | XFS_ATTR_FORK); |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 310 | if (error) |
| 311 | return error; |
| 312 | |
| 313 | /* Start with the attribute data. We'll allocate the rest afterwards. */ |
| 314 | if (crcs) |
| 315 | blkcnt = XFS_B_TO_FSB(mp, args->valuelen); |
| 316 | |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 317 | args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; |
| 318 | args->rmtblkcnt = blkcnt; |
| 319 | |
| 320 | /* |
| 321 | * Roll through the "value", allocating blocks on disk as required. |
| 322 | */ |
| 323 | while (blkcnt > 0) { |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 324 | int committed; |
| 325 | |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 326 | /* |
| 327 | * Allocate a single extent, up to the size of the value. |
| 328 | */ |
| 329 | xfs_bmap_init(args->flist, args->firstblock); |
| 330 | nmap = 1; |
| 331 | error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno, |
| 332 | blkcnt, |
| 333 | XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, |
| 334 | args->firstblock, args->total, &map, &nmap, |
| 335 | args->flist); |
| 336 | if (!error) { |
| 337 | error = xfs_bmap_finish(&args->trans, args->flist, |
| 338 | &committed); |
| 339 | } |
| 340 | if (error) { |
| 341 | ASSERT(committed); |
| 342 | args->trans = NULL; |
| 343 | xfs_bmap_cancel(args->flist); |
| 344 | return(error); |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * bmap_finish() may have committed the last trans and started |
| 349 | * a new one. We need the inode to be in all transactions. |
| 350 | */ |
| 351 | if (committed) |
| 352 | xfs_trans_ijoin(args->trans, dp, 0); |
| 353 | |
| 354 | ASSERT(nmap == 1); |
| 355 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && |
| 356 | (map.br_startblock != HOLESTARTBLOCK)); |
| 357 | lblkno += map.br_blockcount; |
| 358 | blkcnt -= map.br_blockcount; |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 359 | hdrcnt++; |
| 360 | |
| 361 | /* |
| 362 | * If we have enough blocks for the attribute data, calculate |
| 363 | * how many extra blocks we need for headers. We might run |
| 364 | * through this multiple times in the case that the additional |
| 365 | * headers in the blocks needed for the data fragments spills |
| 366 | * into requiring more blocks. e.g. for 512 byte blocks, we'll |
| 367 | * spill for another block every 9 headers we require in this |
| 368 | * loop. |
| 369 | */ |
| 370 | |
| 371 | if (crcs && blkcnt == 0) { |
| 372 | int total_len; |
| 373 | |
| 374 | total_len = args->valuelen + |
| 375 | hdrcnt * sizeof(struct xfs_attr3_rmt_hdr); |
| 376 | blkcnt = XFS_B_TO_FSB(mp, total_len); |
| 377 | blkcnt -= args->rmtblkcnt; |
| 378 | args->rmtblkcnt += blkcnt; |
| 379 | } |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 380 | |
| 381 | /* |
| 382 | * Start the next trans in the chain. |
| 383 | */ |
| 384 | error = xfs_trans_roll(&args->trans, dp); |
| 385 | if (error) |
| 386 | return (error); |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Roll through the "value", copying the attribute value to the |
| 391 | * already-allocated blocks. Blocks are written synchronously |
| 392 | * so that we can know they are all on disk before we turn off |
| 393 | * the INCOMPLETE flag. |
| 394 | */ |
| 395 | lblkno = args->rmtblkno; |
| 396 | valuelen = args->valuelen; |
| 397 | while (valuelen > 0) { |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 398 | int byte_cnt; |
| 399 | char *buf; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 400 | |
| 401 | /* |
| 402 | * Try to remember where we decided to put the value. |
| 403 | */ |
| 404 | xfs_bmap_init(args->flist, args->firstblock); |
| 405 | nmap = 1; |
| 406 | error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, |
| 407 | args->rmtblkcnt, &map, &nmap, |
| 408 | XFS_BMAPI_ATTRFORK); |
| 409 | if (error) |
| 410 | return(error); |
| 411 | ASSERT(nmap == 1); |
| 412 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && |
| 413 | (map.br_startblock != HOLESTARTBLOCK)); |
| 414 | |
| 415 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), |
| 416 | blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
| 417 | |
| 418 | bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt, 0); |
| 419 | if (!bp) |
| 420 | return ENOMEM; |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 421 | bp->b_ops = &xfs_attr3_rmt_buf_ops; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 422 | |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 423 | byte_cnt = BBTOB(bp->b_length); |
| 424 | byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, byte_cnt); |
| 425 | if (valuelen < byte_cnt) { |
| 426 | byte_cnt = valuelen; |
| 427 | } |
| 428 | |
| 429 | buf = bp->b_addr; |
| 430 | buf += xfs_attr3_rmt_hdr_set(mp, dp->i_ino, offset, |
| 431 | byte_cnt, bp); |
| 432 | memcpy(buf, src, byte_cnt); |
| 433 | |
| 434 | if (byte_cnt < BBTOB(bp->b_length)) |
| 435 | xfs_buf_zero(bp, byte_cnt, |
| 436 | BBTOB(bp->b_length) - byte_cnt); |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 437 | |
| 438 | error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ |
| 439 | xfs_buf_relse(bp); |
| 440 | if (error) |
| 441 | return error; |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 442 | |
| 443 | src += byte_cnt; |
| 444 | valuelen -= byte_cnt; |
| 445 | offset += byte_cnt; |
| 446 | hdrcnt--; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 447 | |
| 448 | lblkno += map.br_blockcount; |
| 449 | } |
| 450 | ASSERT(valuelen == 0); |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 451 | ASSERT(hdrcnt == 0); |
| 452 | return 0; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | /* |
| 456 | * Remove the value associated with an attribute by deleting the |
| 457 | * out-of-line buffer that it is stored on. |
| 458 | */ |
| 459 | int |
| 460 | xfs_attr_rmtval_remove(xfs_da_args_t *args) |
| 461 | { |
| 462 | xfs_mount_t *mp; |
| 463 | xfs_bmbt_irec_t map; |
| 464 | xfs_buf_t *bp; |
| 465 | xfs_daddr_t dblkno; |
| 466 | xfs_dablk_t lblkno; |
| 467 | int valuelen, blkcnt, nmap, error, done, committed; |
| 468 | |
| 469 | trace_xfs_attr_rmtval_remove(args); |
| 470 | |
| 471 | mp = args->dp->i_mount; |
| 472 | |
| 473 | /* |
| 474 | * Roll through the "value", invalidating the attribute value's |
| 475 | * blocks. |
| 476 | */ |
| 477 | lblkno = args->rmtblkno; |
| 478 | valuelen = args->rmtblkcnt; |
| 479 | while (valuelen > 0) { |
| 480 | /* |
| 481 | * Try to remember where we decided to put the value. |
| 482 | */ |
| 483 | nmap = 1; |
| 484 | error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, |
| 485 | args->rmtblkcnt, &map, &nmap, |
| 486 | XFS_BMAPI_ATTRFORK); |
| 487 | if (error) |
| 488 | return(error); |
| 489 | ASSERT(nmap == 1); |
| 490 | ASSERT((map.br_startblock != DELAYSTARTBLOCK) && |
| 491 | (map.br_startblock != HOLESTARTBLOCK)); |
| 492 | |
| 493 | dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), |
| 494 | blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); |
| 495 | |
| 496 | /* |
| 497 | * If the "remote" value is in the cache, remove it. |
| 498 | */ |
| 499 | bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XBF_TRYLOCK); |
| 500 | if (bp) { |
| 501 | xfs_buf_stale(bp); |
| 502 | xfs_buf_relse(bp); |
| 503 | bp = NULL; |
| 504 | } |
| 505 | |
| 506 | valuelen -= map.br_blockcount; |
| 507 | |
| 508 | lblkno += map.br_blockcount; |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Keep de-allocating extents until the remote-value region is gone. |
| 513 | */ |
| 514 | lblkno = args->rmtblkno; |
| 515 | blkcnt = args->rmtblkcnt; |
| 516 | done = 0; |
| 517 | while (!done) { |
| 518 | xfs_bmap_init(args->flist, args->firstblock); |
| 519 | error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, |
| 520 | XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, |
| 521 | 1, args->firstblock, args->flist, |
| 522 | &done); |
| 523 | if (!error) { |
| 524 | error = xfs_bmap_finish(&args->trans, args->flist, |
| 525 | &committed); |
| 526 | } |
| 527 | if (error) { |
| 528 | ASSERT(committed); |
| 529 | args->trans = NULL; |
| 530 | xfs_bmap_cancel(args->flist); |
Dave Chinner | d2e448d | 2013-04-03 16:11:28 +1100 | [diff] [blame^] | 531 | return error; |
Dave Chinner | 95920cd | 2013-04-03 16:11:27 +1100 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | /* |
| 535 | * bmap_finish() may have committed the last trans and started |
| 536 | * a new one. We need the inode to be in all transactions. |
| 537 | */ |
| 538 | if (committed) |
| 539 | xfs_trans_ijoin(args->trans, args->dp, 0); |
| 540 | |
| 541 | /* |
| 542 | * Close out trans and start the next one in the chain. |
| 543 | */ |
| 544 | error = xfs_trans_roll(&args->trans, args->dp); |
| 545 | if (error) |
| 546 | return (error); |
| 547 | } |
| 548 | return(0); |
| 549 | } |
| 550 | |