2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
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.
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.
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
21 #include "xfs_types.h"
24 #include "xfs_trans.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"
37 #include "xfs_attr_leaf.h"
38 #include "xfs_attr_remote.h"
39 #include "xfs_trans_space.h"
40 #include "xfs_trace.h"
41 #include "xfs_cksum.h"
42 #include "xfs_buf_item.h"
44 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
47 * Each contiguous block has a header, so it is not just a simple attribute
48 * length to FSB conversion.
55 if (xfs_sb_version_hascrc(&mp->m_sb)) {
56 int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
57 return (attrlen + buflen - 1) / buflen;
59 return XFS_B_TO_FSB(mp, attrlen);
63 * Checking of the remote attribute header is split into two parts. The verifier
64 * does CRC, location and bounds checking, the unpacking function checks the
65 * attribute parameters and owner.
76 struct xfs_attr3_rmt_hdr *rmt = ptr;
78 if (bno != be64_to_cpu(rmt->rm_blkno))
80 if (offset != be32_to_cpu(rmt->rm_offset))
82 if (size != be32_to_cpu(rmt->rm_bytes))
84 if (ino != be64_to_cpu(rmt->rm_owner))
98 struct xfs_attr3_rmt_hdr *rmt = ptr;
100 if (!xfs_sb_version_hascrc(&mp->m_sb))
102 if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC))
104 if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid))
106 if (be64_to_cpu(rmt->rm_blkno) != bno)
108 if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt))
110 if (be32_to_cpu(rmt->rm_offset) +
111 be32_to_cpu(rmt->rm_bytes) >= XATTR_SIZE_MAX)
113 if (rmt->rm_owner == 0)
120 xfs_attr3_rmt_read_verify(
123 struct xfs_mount *mp = bp->b_target->bt_mount;
126 bool corrupt = false;
129 /* no verification of non-crc buffers */
130 if (!xfs_sb_version_hascrc(&mp->m_sb))
135 len = BBTOB(bp->b_length);
136 ASSERT(len >= XFS_LBSIZE(mp));
139 if (!xfs_verify_cksum(ptr, XFS_LBSIZE(mp),
140 XFS_ATTR3_RMT_CRC_OFF)) {
144 if (!xfs_attr3_rmt_verify(mp, ptr, XFS_LBSIZE(mp), bno)) {
148 len -= XFS_LBSIZE(mp);
149 ptr += XFS_LBSIZE(mp);
154 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
155 xfs_buf_ioerror(bp, EFSCORRUPTED);
161 xfs_attr3_rmt_write_verify(
164 struct xfs_mount *mp = bp->b_target->bt_mount;
165 struct xfs_buf_log_item *bip = bp->b_fspriv;
170 /* no verification of non-crc buffers */
171 if (!xfs_sb_version_hascrc(&mp->m_sb))
176 len = BBTOB(bp->b_length);
177 ASSERT(len >= XFS_LBSIZE(mp));
180 if (!xfs_attr3_rmt_verify(mp, ptr, XFS_LBSIZE(mp), bno)) {
181 XFS_CORRUPTION_ERROR(__func__,
182 XFS_ERRLEVEL_LOW, mp, bp->b_addr);
183 xfs_buf_ioerror(bp, EFSCORRUPTED);
187 struct xfs_attr3_rmt_hdr *rmt;
189 rmt = (struct xfs_attr3_rmt_hdr *)ptr;
190 rmt->rm_lsn = cpu_to_be64(bip->bli_item.li_lsn);
192 xfs_update_cksum(ptr, XFS_LBSIZE(mp), XFS_ATTR3_RMT_CRC_OFF);
194 len -= XFS_LBSIZE(mp);
195 ptr += XFS_LBSIZE(mp);
201 const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = {
202 .verify_read = xfs_attr3_rmt_read_verify,
203 .verify_write = xfs_attr3_rmt_write_verify,
207 xfs_attr3_rmt_hdr_set(
208 struct xfs_mount *mp,
215 struct xfs_attr3_rmt_hdr *rmt = ptr;
217 if (!xfs_sb_version_hascrc(&mp->m_sb))
220 rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC);
221 rmt->rm_offset = cpu_to_be32(offset);
222 rmt->rm_bytes = cpu_to_be32(size);
223 uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid);
224 rmt->rm_owner = cpu_to_be64(ino);
225 rmt->rm_blkno = cpu_to_be64(bno);
227 return sizeof(struct xfs_attr3_rmt_hdr);
231 * Helper functions to copy attribute data in and out of the one disk extents
234 xfs_attr_rmtval_copyout(
235 struct xfs_mount *mp,
242 char *src = bp->b_addr;
243 xfs_daddr_t bno = bp->b_bn;
244 int len = BBTOB(bp->b_length);
246 ASSERT(len >= XFS_LBSIZE(mp));
248 while (len > 0 && *valuelen > 0) {
250 int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, XFS_LBSIZE(mp));
252 byte_cnt = min_t(int, *valuelen, byte_cnt);
254 if (xfs_sb_version_hascrc(&mp->m_sb)) {
255 if (!xfs_attr3_rmt_hdr_ok(mp, src, ino, *offset,
258 "remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)",
259 bno, *offset, byte_cnt, ino);
262 hdr_size = sizeof(struct xfs_attr3_rmt_hdr);
265 memcpy(*dst, src + hdr_size, byte_cnt);
267 /* roll buffer forwards */
268 len -= XFS_LBSIZE(mp);
269 src += XFS_LBSIZE(mp);
272 /* roll attribute data forwards */
273 *valuelen -= byte_cnt;
281 xfs_attr_rmtval_copyin(
282 struct xfs_mount *mp,
289 char *dst = bp->b_addr;
290 xfs_daddr_t bno = bp->b_bn;
291 int len = BBTOB(bp->b_length);
293 ASSERT(len >= XFS_LBSIZE(mp));
295 while (len > 0 && *valuelen > 0) {
297 int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, XFS_LBSIZE(mp));
299 byte_cnt = min(*valuelen, byte_cnt);
300 hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset,
303 memcpy(dst + hdr_size, *src, byte_cnt);
306 * If this is the last block, zero the remainder of it.
307 * Check that we are actually the last block, too.
309 if (byte_cnt + hdr_size < XFS_LBSIZE(mp)) {
310 ASSERT(*valuelen - byte_cnt == 0);
311 ASSERT(len == XFS_LBSIZE(mp));
312 memset(dst + hdr_size + byte_cnt, 0,
313 XFS_LBSIZE(mp) - hdr_size - byte_cnt);
316 /* roll buffer forwards */
317 len -= XFS_LBSIZE(mp);
318 dst += XFS_LBSIZE(mp);
321 /* roll attribute data forwards */
322 *valuelen -= byte_cnt;
329 * Read the value associated with an attribute from the out-of-line buffer
330 * that we stored it in.
334 struct xfs_da_args *args)
336 struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE];
337 struct xfs_mount *mp = args->dp->i_mount;
339 xfs_dablk_t lblkno = args->rmtblkno;
340 char *dst = args->value;
341 int valuelen = args->valuelen;
344 int blkcnt = args->rmtblkcnt;
348 trace_xfs_attr_rmtval_get(args);
350 ASSERT(!(args->flags & ATTR_KERNOVAL));
352 while (valuelen > 0) {
353 nmap = ATTR_RMTVALUE_MAPSIZE;
354 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
361 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
365 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
366 (map[i].br_startblock != HOLESTARTBLOCK));
367 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
368 dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
369 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
370 dblkno, dblkcnt, 0, &bp,
371 &xfs_attr3_rmt_buf_ops);
375 error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino,
382 /* roll attribute extent map forwards */
383 lblkno += map[i].br_blockcount;
384 blkcnt -= map[i].br_blockcount;
387 ASSERT(valuelen == 0);
392 * Write the value associated with an attribute into the out-of-line buffer
393 * that we have defined for it.
397 struct xfs_da_args *args)
399 struct xfs_inode *dp = args->dp;
400 struct xfs_mount *mp = dp->i_mount;
401 struct xfs_bmbt_irec map;
403 xfs_fileoff_t lfileoff = 0;
404 char *src = args->value;
411 trace_xfs_attr_rmtval_set(args);
414 * Find a "hole" in the attribute address space large enough for
415 * us to drop the new attribute's value into. Because CRC enable
416 * attributes have headers, we can't just do a straight byte to FSB
417 * conversion and have to take the header space into account.
419 blkcnt = xfs_attr3_rmt_blocks(mp, args->valuelen);
420 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
425 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
426 args->rmtblkcnt = blkcnt;
429 * Roll through the "value", allocating blocks on disk as required.
435 * Allocate a single extent, up to the size of the value.
437 xfs_bmap_init(args->flist, args->firstblock);
439 error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
441 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
442 args->firstblock, args->total, &map, &nmap,
445 error = xfs_bmap_finish(&args->trans, args->flist,
451 xfs_bmap_cancel(args->flist);
456 * bmap_finish() may have committed the last trans and started
457 * a new one. We need the inode to be in all transactions.
460 xfs_trans_ijoin(args->trans, dp, 0);
463 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
464 (map.br_startblock != HOLESTARTBLOCK));
465 lblkno += map.br_blockcount;
466 blkcnt -= map.br_blockcount;
469 * Start the next trans in the chain.
471 error = xfs_trans_roll(&args->trans, dp);
477 * Roll through the "value", copying the attribute value to the
478 * already-allocated blocks. Blocks are written synchronously
479 * so that we can know they are all on disk before we turn off
480 * the INCOMPLETE flag.
482 lblkno = args->rmtblkno;
483 blkcnt = args->rmtblkcnt;
484 valuelen = args->valuelen;
485 while (valuelen > 0) {
492 xfs_bmap_init(args->flist, args->firstblock);
494 error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
500 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
501 (map.br_startblock != HOLESTARTBLOCK));
503 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
504 dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
506 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0);
509 bp->b_ops = &xfs_attr3_rmt_buf_ops;
511 xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset,
514 error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
520 /* roll attribute extent map forwards */
521 lblkno += map.br_blockcount;
522 blkcnt -= map.br_blockcount;
524 ASSERT(valuelen == 0);
529 * Remove the value associated with an attribute by deleting the
530 * out-of-line buffer that it is stored on.
533 xfs_attr_rmtval_remove(
534 struct xfs_da_args *args)
536 struct xfs_mount *mp = args->dp->i_mount;
542 trace_xfs_attr_rmtval_remove(args);
545 * Roll through the "value", invalidating the attribute value's blocks.
546 * Note that args->rmtblkcnt is the minimum number of data blocks we'll
547 * see for a CRC enabled remote attribute. Each extent will have a
548 * header, and so we may have more blocks than we realise here. If we
549 * fail to map the blocks correctly, we'll have problems with the buffer
552 lblkno = args->rmtblkno;
553 blkcnt = args->rmtblkcnt;
555 struct xfs_bmbt_irec map;
562 * Try to remember where we decided to put the value.
565 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
566 blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK);
570 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
571 (map.br_startblock != HOLESTARTBLOCK));
573 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
574 dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
577 * If the "remote" value is in the cache, remove it.
579 bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK);
586 lblkno += map.br_blockcount;
587 blkcnt -= map.br_blockcount;
591 * Keep de-allocating extents until the remote-value region is gone.
593 lblkno = args->rmtblkno;
594 blkcnt = args->rmtblkcnt;
599 xfs_bmap_init(args->flist, args->firstblock);
600 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
601 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
602 1, args->firstblock, args->flist,
605 error = xfs_bmap_finish(&args->trans, args->flist,
611 xfs_bmap_cancel(args->flist);
616 * bmap_finish() may have committed the last trans and started
617 * a new one. We need the inode to be in all transactions.
620 xfs_trans_ijoin(args->trans, args->dp, 0);
623 * Close out trans and start the next one in the chain.
625 error = xfs_trans_roll(&args->trans, args->dp);