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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
e89c0413 DW |
2 | /* |
3 | * Copyright (C) 2017 Oracle. All Rights Reserved. | |
e89c0413 | 4 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
e89c0413 DW |
5 | */ |
6 | #include "xfs.h" | |
7 | #include "xfs_fs.h" | |
8 | #include "xfs_shared.h" | |
9 | #include "xfs_format.h" | |
10 | #include "xfs_log_format.h" | |
11 | #include "xfs_trans_resv.h" | |
12 | #include "xfs_sb.h" | |
13 | #include "xfs_mount.h" | |
14 | #include "xfs_defer.h" | |
15 | #include "xfs_inode.h" | |
16 | #include "xfs_trans.h" | |
17 | #include "xfs_error.h" | |
18 | #include "xfs_btree.h" | |
19 | #include "xfs_rmap_btree.h" | |
20 | #include "xfs_trace.h" | |
21 | #include "xfs_log.h" | |
22 | #include "xfs_rmap.h" | |
23 | #include "xfs_alloc.h" | |
24 | #include "xfs_bit.h" | |
25 | #include <linux/fsmap.h> | |
26 | #include "xfs_fsmap.h" | |
27 | #include "xfs_refcount.h" | |
28 | #include "xfs_refcount_btree.h" | |
a1cae728 | 29 | #include "xfs_alloc_btree.h" |
4c934c7d | 30 | #include "xfs_rtalloc.h" |
e89c0413 DW |
31 | |
32 | /* Convert an xfs_fsmap to an fsmap. */ | |
33 | void | |
34 | xfs_fsmap_from_internal( | |
35 | struct fsmap *dest, | |
36 | struct xfs_fsmap *src) | |
37 | { | |
38 | dest->fmr_device = src->fmr_device; | |
39 | dest->fmr_flags = src->fmr_flags; | |
40 | dest->fmr_physical = BBTOB(src->fmr_physical); | |
41 | dest->fmr_owner = src->fmr_owner; | |
42 | dest->fmr_offset = BBTOB(src->fmr_offset); | |
43 | dest->fmr_length = BBTOB(src->fmr_length); | |
44 | dest->fmr_reserved[0] = 0; | |
45 | dest->fmr_reserved[1] = 0; | |
46 | dest->fmr_reserved[2] = 0; | |
47 | } | |
48 | ||
49 | /* Convert an fsmap to an xfs_fsmap. */ | |
50 | void | |
51 | xfs_fsmap_to_internal( | |
52 | struct xfs_fsmap *dest, | |
53 | struct fsmap *src) | |
54 | { | |
55 | dest->fmr_device = src->fmr_device; | |
56 | dest->fmr_flags = src->fmr_flags; | |
57 | dest->fmr_physical = BTOBBT(src->fmr_physical); | |
58 | dest->fmr_owner = src->fmr_owner; | |
59 | dest->fmr_offset = BTOBBT(src->fmr_offset); | |
60 | dest->fmr_length = BTOBBT(src->fmr_length); | |
61 | } | |
62 | ||
63 | /* Convert an fsmap owner into an rmapbt owner. */ | |
64 | static int | |
65 | xfs_fsmap_owner_to_rmap( | |
66 | struct xfs_rmap_irec *dest, | |
67 | struct xfs_fsmap *src) | |
68 | { | |
69 | if (!(src->fmr_flags & FMR_OF_SPECIAL_OWNER)) { | |
70 | dest->rm_owner = src->fmr_owner; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | switch (src->fmr_owner) { | |
75 | case 0: /* "lowest owner id possible" */ | |
76 | case -1ULL: /* "highest owner id possible" */ | |
77 | dest->rm_owner = 0; | |
78 | break; | |
79 | case XFS_FMR_OWN_FREE: | |
80 | dest->rm_owner = XFS_RMAP_OWN_NULL; | |
81 | break; | |
82 | case XFS_FMR_OWN_UNKNOWN: | |
83 | dest->rm_owner = XFS_RMAP_OWN_UNKNOWN; | |
84 | break; | |
85 | case XFS_FMR_OWN_FS: | |
86 | dest->rm_owner = XFS_RMAP_OWN_FS; | |
87 | break; | |
88 | case XFS_FMR_OWN_LOG: | |
89 | dest->rm_owner = XFS_RMAP_OWN_LOG; | |
90 | break; | |
91 | case XFS_FMR_OWN_AG: | |
92 | dest->rm_owner = XFS_RMAP_OWN_AG; | |
93 | break; | |
94 | case XFS_FMR_OWN_INOBT: | |
95 | dest->rm_owner = XFS_RMAP_OWN_INOBT; | |
96 | break; | |
97 | case XFS_FMR_OWN_INODES: | |
98 | dest->rm_owner = XFS_RMAP_OWN_INODES; | |
99 | break; | |
100 | case XFS_FMR_OWN_REFC: | |
101 | dest->rm_owner = XFS_RMAP_OWN_REFC; | |
102 | break; | |
103 | case XFS_FMR_OWN_COW: | |
104 | dest->rm_owner = XFS_RMAP_OWN_COW; | |
105 | break; | |
106 | case XFS_FMR_OWN_DEFECTIVE: /* not implemented */ | |
107 | /* fall through */ | |
108 | default: | |
109 | return -EINVAL; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /* Convert an rmapbt owner into an fsmap owner. */ | |
115 | static int | |
116 | xfs_fsmap_owner_from_rmap( | |
117 | struct xfs_fsmap *dest, | |
118 | struct xfs_rmap_irec *src) | |
119 | { | |
120 | dest->fmr_flags = 0; | |
121 | if (!XFS_RMAP_NON_INODE_OWNER(src->rm_owner)) { | |
122 | dest->fmr_owner = src->rm_owner; | |
123 | return 0; | |
124 | } | |
125 | dest->fmr_flags |= FMR_OF_SPECIAL_OWNER; | |
126 | ||
127 | switch (src->rm_owner) { | |
128 | case XFS_RMAP_OWN_FS: | |
129 | dest->fmr_owner = XFS_FMR_OWN_FS; | |
130 | break; | |
131 | case XFS_RMAP_OWN_LOG: | |
132 | dest->fmr_owner = XFS_FMR_OWN_LOG; | |
133 | break; | |
134 | case XFS_RMAP_OWN_AG: | |
135 | dest->fmr_owner = XFS_FMR_OWN_AG; | |
136 | break; | |
137 | case XFS_RMAP_OWN_INOBT: | |
138 | dest->fmr_owner = XFS_FMR_OWN_INOBT; | |
139 | break; | |
140 | case XFS_RMAP_OWN_INODES: | |
141 | dest->fmr_owner = XFS_FMR_OWN_INODES; | |
142 | break; | |
143 | case XFS_RMAP_OWN_REFC: | |
144 | dest->fmr_owner = XFS_FMR_OWN_REFC; | |
145 | break; | |
146 | case XFS_RMAP_OWN_COW: | |
147 | dest->fmr_owner = XFS_FMR_OWN_COW; | |
148 | break; | |
a1cae728 DW |
149 | case XFS_RMAP_OWN_NULL: /* "free" */ |
150 | dest->fmr_owner = XFS_FMR_OWN_FREE; | |
151 | break; | |
e89c0413 DW |
152 | default: |
153 | return -EFSCORRUPTED; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* getfsmap query state */ | |
159 | struct xfs_getfsmap_info { | |
160 | struct xfs_fsmap_head *head; | |
161 | xfs_fsmap_format_t formatter; /* formatting fn */ | |
162 | void *format_arg; /* format buffer */ | |
163 | struct xfs_buf *agf_bp; /* AGF, for refcount queries */ | |
164 | xfs_daddr_t next_daddr; /* next daddr we expect */ | |
165 | u64 missing_owner; /* owner of holes */ | |
166 | u32 dev; /* device id */ | |
167 | xfs_agnumber_t agno; /* AG number, if applicable */ | |
168 | struct xfs_rmap_irec low; /* low rmap key */ | |
169 | struct xfs_rmap_irec high; /* high rmap key */ | |
170 | bool last; /* last extent? */ | |
171 | }; | |
172 | ||
173 | /* Associate a device with a getfsmap handler. */ | |
174 | struct xfs_getfsmap_dev { | |
175 | u32 dev; | |
176 | int (*fn)(struct xfs_trans *tp, | |
177 | struct xfs_fsmap *keys, | |
178 | struct xfs_getfsmap_info *info); | |
179 | }; | |
180 | ||
181 | /* Compare two getfsmap device handlers. */ | |
182 | static int | |
183 | xfs_getfsmap_dev_compare( | |
184 | const void *p1, | |
185 | const void *p2) | |
186 | { | |
187 | const struct xfs_getfsmap_dev *d1 = p1; | |
188 | const struct xfs_getfsmap_dev *d2 = p2; | |
189 | ||
190 | return d1->dev - d2->dev; | |
191 | } | |
192 | ||
193 | /* Decide if this mapping is shared. */ | |
194 | STATIC int | |
195 | xfs_getfsmap_is_shared( | |
196 | struct xfs_trans *tp, | |
197 | struct xfs_getfsmap_info *info, | |
198 | struct xfs_rmap_irec *rec, | |
199 | bool *stat) | |
200 | { | |
201 | struct xfs_mount *mp = tp->t_mountp; | |
202 | struct xfs_btree_cur *cur; | |
203 | xfs_agblock_t fbno; | |
204 | xfs_extlen_t flen; | |
205 | int error; | |
206 | ||
207 | *stat = false; | |
208 | if (!xfs_sb_version_hasreflink(&mp->m_sb)) | |
209 | return 0; | |
210 | /* rt files will have agno set to NULLAGNUMBER */ | |
211 | if (info->agno == NULLAGNUMBER) | |
212 | return 0; | |
213 | ||
214 | /* Are there any shared blocks here? */ | |
215 | flen = 0; | |
216 | cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp, | |
ed7ef8e5 | 217 | info->agno); |
e89c0413 DW |
218 | |
219 | error = xfs_refcount_find_shared(cur, rec->rm_startblock, | |
220 | rec->rm_blockcount, &fbno, &flen, false); | |
221 | ||
0b04b6b8 | 222 | xfs_btree_del_cursor(cur, error); |
e89c0413 DW |
223 | if (error) |
224 | return error; | |
225 | ||
226 | *stat = flen > 0; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Format a reverse mapping for getfsmap, having translated rm_startblock | |
232 | * into the appropriate daddr units. | |
233 | */ | |
234 | STATIC int | |
235 | xfs_getfsmap_helper( | |
236 | struct xfs_trans *tp, | |
237 | struct xfs_getfsmap_info *info, | |
238 | struct xfs_rmap_irec *rec, | |
239 | xfs_daddr_t rec_daddr) | |
240 | { | |
241 | struct xfs_fsmap fmr; | |
242 | struct xfs_mount *mp = tp->t_mountp; | |
243 | bool shared; | |
244 | int error; | |
245 | ||
246 | if (fatal_signal_pending(current)) | |
247 | return -EINTR; | |
248 | ||
249 | /* | |
250 | * Filter out records that start before our startpoint, if the | |
251 | * caller requested that. | |
252 | */ | |
253 | if (xfs_rmap_compare(rec, &info->low) < 0) { | |
254 | rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
255 | if (info->next_daddr < rec_daddr) | |
256 | info->next_daddr = rec_daddr; | |
257 | return XFS_BTREE_QUERY_RANGE_CONTINUE; | |
258 | } | |
259 | ||
260 | /* Are we just counting mappings? */ | |
261 | if (info->head->fmh_count == 0) { | |
262 | if (rec_daddr > info->next_daddr) | |
263 | info->head->fmh_entries++; | |
264 | ||
265 | if (info->last) | |
266 | return XFS_BTREE_QUERY_RANGE_CONTINUE; | |
267 | ||
268 | info->head->fmh_entries++; | |
269 | ||
270 | rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
271 | if (info->next_daddr < rec_daddr) | |
272 | info->next_daddr = rec_daddr; | |
273 | return XFS_BTREE_QUERY_RANGE_CONTINUE; | |
274 | } | |
275 | ||
276 | /* | |
277 | * If the record starts past the last physical block we saw, | |
278 | * then we've found a gap. Report the gap as being owned by | |
279 | * whatever the caller specified is the missing owner. | |
280 | */ | |
281 | if (rec_daddr > info->next_daddr) { | |
282 | if (info->head->fmh_entries >= info->head->fmh_count) | |
283 | return XFS_BTREE_QUERY_RANGE_ABORT; | |
284 | ||
285 | fmr.fmr_device = info->dev; | |
286 | fmr.fmr_physical = info->next_daddr; | |
287 | fmr.fmr_owner = info->missing_owner; | |
288 | fmr.fmr_offset = 0; | |
289 | fmr.fmr_length = rec_daddr - info->next_daddr; | |
290 | fmr.fmr_flags = FMR_OF_SPECIAL_OWNER; | |
291 | error = info->formatter(&fmr, info->format_arg); | |
292 | if (error) | |
293 | return error; | |
294 | info->head->fmh_entries++; | |
295 | } | |
296 | ||
297 | if (info->last) | |
298 | goto out; | |
299 | ||
300 | /* Fill out the extent we found */ | |
301 | if (info->head->fmh_entries >= info->head->fmh_count) | |
302 | return XFS_BTREE_QUERY_RANGE_ABORT; | |
303 | ||
304 | trace_xfs_fsmap_mapping(mp, info->dev, info->agno, rec); | |
305 | ||
306 | fmr.fmr_device = info->dev; | |
307 | fmr.fmr_physical = rec_daddr; | |
308 | error = xfs_fsmap_owner_from_rmap(&fmr, rec); | |
309 | if (error) | |
310 | return error; | |
311 | fmr.fmr_offset = XFS_FSB_TO_BB(mp, rec->rm_offset); | |
312 | fmr.fmr_length = XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
313 | if (rec->rm_flags & XFS_RMAP_UNWRITTEN) | |
314 | fmr.fmr_flags |= FMR_OF_PREALLOC; | |
315 | if (rec->rm_flags & XFS_RMAP_ATTR_FORK) | |
316 | fmr.fmr_flags |= FMR_OF_ATTR_FORK; | |
317 | if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK) | |
318 | fmr.fmr_flags |= FMR_OF_EXTENT_MAP; | |
319 | if (fmr.fmr_flags == 0) { | |
320 | error = xfs_getfsmap_is_shared(tp, info, rec, &shared); | |
321 | if (error) | |
322 | return error; | |
323 | if (shared) | |
324 | fmr.fmr_flags |= FMR_OF_SHARED; | |
325 | } | |
326 | error = info->formatter(&fmr, info->format_arg); | |
327 | if (error) | |
328 | return error; | |
329 | info->head->fmh_entries++; | |
330 | ||
331 | out: | |
332 | rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
333 | if (info->next_daddr < rec_daddr) | |
334 | info->next_daddr = rec_daddr; | |
335 | return XFS_BTREE_QUERY_RANGE_CONTINUE; | |
336 | } | |
337 | ||
338 | /* Transform a rmapbt irec into a fsmap */ | |
339 | STATIC int | |
340 | xfs_getfsmap_datadev_helper( | |
341 | struct xfs_btree_cur *cur, | |
342 | struct xfs_rmap_irec *rec, | |
343 | void *priv) | |
344 | { | |
345 | struct xfs_mount *mp = cur->bc_mp; | |
346 | struct xfs_getfsmap_info *info = priv; | |
347 | xfs_fsblock_t fsb; | |
348 | xfs_daddr_t rec_daddr; | |
349 | ||
350 | fsb = XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, rec->rm_startblock); | |
351 | rec_daddr = XFS_FSB_TO_DADDR(mp, fsb); | |
352 | ||
353 | return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr); | |
354 | } | |
355 | ||
a1cae728 DW |
356 | /* Transform a bnobt irec into a fsmap */ |
357 | STATIC int | |
358 | xfs_getfsmap_datadev_bnobt_helper( | |
359 | struct xfs_btree_cur *cur, | |
360 | struct xfs_alloc_rec_incore *rec, | |
361 | void *priv) | |
362 | { | |
363 | struct xfs_mount *mp = cur->bc_mp; | |
364 | struct xfs_getfsmap_info *info = priv; | |
365 | struct xfs_rmap_irec irec; | |
366 | xfs_daddr_t rec_daddr; | |
367 | ||
368 | rec_daddr = XFS_AGB_TO_DADDR(mp, cur->bc_private.a.agno, | |
369 | rec->ar_startblock); | |
370 | ||
371 | irec.rm_startblock = rec->ar_startblock; | |
372 | irec.rm_blockcount = rec->ar_blockcount; | |
373 | irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */ | |
374 | irec.rm_offset = 0; | |
375 | irec.rm_flags = 0; | |
376 | ||
377 | return xfs_getfsmap_helper(cur->bc_tp, info, &irec, rec_daddr); | |
378 | } | |
379 | ||
e89c0413 DW |
380 | /* Set rmap flags based on the getfsmap flags */ |
381 | static void | |
382 | xfs_getfsmap_set_irec_flags( | |
383 | struct xfs_rmap_irec *irec, | |
384 | struct xfs_fsmap *fmr) | |
385 | { | |
386 | irec->rm_flags = 0; | |
387 | if (fmr->fmr_flags & FMR_OF_ATTR_FORK) | |
388 | irec->rm_flags |= XFS_RMAP_ATTR_FORK; | |
389 | if (fmr->fmr_flags & FMR_OF_EXTENT_MAP) | |
390 | irec->rm_flags |= XFS_RMAP_BMBT_BLOCK; | |
391 | if (fmr->fmr_flags & FMR_OF_PREALLOC) | |
392 | irec->rm_flags |= XFS_RMAP_UNWRITTEN; | |
393 | } | |
394 | ||
395 | /* Execute a getfsmap query against the log device. */ | |
396 | STATIC int | |
397 | xfs_getfsmap_logdev( | |
398 | struct xfs_trans *tp, | |
399 | struct xfs_fsmap *keys, | |
400 | struct xfs_getfsmap_info *info) | |
401 | { | |
402 | struct xfs_mount *mp = tp->t_mountp; | |
403 | struct xfs_rmap_irec rmap; | |
404 | int error; | |
405 | ||
406 | /* Set up search keys */ | |
407 | info->low.rm_startblock = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical); | |
408 | info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); | |
409 | error = xfs_fsmap_owner_to_rmap(&info->low, keys); | |
410 | if (error) | |
411 | return error; | |
412 | info->low.rm_blockcount = 0; | |
413 | xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); | |
414 | ||
415 | error = xfs_fsmap_owner_to_rmap(&info->high, keys + 1); | |
416 | if (error) | |
417 | return error; | |
418 | info->high.rm_startblock = -1U; | |
419 | info->high.rm_owner = ULLONG_MAX; | |
420 | info->high.rm_offset = ULLONG_MAX; | |
421 | info->high.rm_blockcount = 0; | |
422 | info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; | |
423 | info->missing_owner = XFS_FMR_OWN_FREE; | |
424 | ||
425 | trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low); | |
426 | trace_xfs_fsmap_high_key(mp, info->dev, info->agno, &info->high); | |
427 | ||
428 | if (keys[0].fmr_physical > 0) | |
429 | return 0; | |
430 | ||
431 | /* Fabricate an rmap entry for the external log device. */ | |
432 | rmap.rm_startblock = 0; | |
433 | rmap.rm_blockcount = mp->m_sb.sb_logblocks; | |
434 | rmap.rm_owner = XFS_RMAP_OWN_LOG; | |
435 | rmap.rm_offset = 0; | |
436 | rmap.rm_flags = 0; | |
437 | ||
438 | return xfs_getfsmap_helper(tp, info, &rmap, 0); | |
439 | } | |
440 | ||
785545c8 AB |
441 | #ifdef CONFIG_XFS_RT |
442 | /* Transform a rtbitmap "record" into a fsmap */ | |
443 | STATIC int | |
444 | xfs_getfsmap_rtdev_rtbitmap_helper( | |
445 | struct xfs_trans *tp, | |
446 | struct xfs_rtalloc_rec *rec, | |
447 | void *priv) | |
448 | { | |
449 | struct xfs_mount *mp = tp->t_mountp; | |
450 | struct xfs_getfsmap_info *info = priv; | |
451 | struct xfs_rmap_irec irec; | |
452 | xfs_daddr_t rec_daddr; | |
453 | ||
a0e5c435 DW |
454 | irec.rm_startblock = rec->ar_startext * mp->m_sb.sb_rextsize; |
455 | rec_daddr = XFS_FSB_TO_BB(mp, irec.rm_startblock); | |
456 | irec.rm_blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize; | |
785545c8 AB |
457 | irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */ |
458 | irec.rm_offset = 0; | |
459 | irec.rm_flags = 0; | |
460 | ||
461 | return xfs_getfsmap_helper(tp, info, &irec, rec_daddr); | |
462 | } | |
463 | ||
4c934c7d DW |
464 | /* Execute a getfsmap query against the realtime device. */ |
465 | STATIC int | |
466 | __xfs_getfsmap_rtdev( | |
467 | struct xfs_trans *tp, | |
468 | struct xfs_fsmap *keys, | |
469 | int (*query_fn)(struct xfs_trans *, | |
470 | struct xfs_getfsmap_info *), | |
471 | struct xfs_getfsmap_info *info) | |
472 | { | |
473 | struct xfs_mount *mp = tp->t_mountp; | |
474 | xfs_fsblock_t start_fsb; | |
475 | xfs_fsblock_t end_fsb; | |
476 | xfs_daddr_t eofs; | |
477 | int error = 0; | |
478 | ||
479 | eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks); | |
480 | if (keys[0].fmr_physical >= eofs) | |
481 | return 0; | |
482 | if (keys[1].fmr_physical >= eofs) | |
483 | keys[1].fmr_physical = eofs - 1; | |
484 | start_fsb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical); | |
485 | end_fsb = XFS_BB_TO_FSB(mp, keys[1].fmr_physical); | |
486 | ||
487 | /* Set up search keys */ | |
488 | info->low.rm_startblock = start_fsb; | |
489 | error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]); | |
490 | if (error) | |
491 | return error; | |
492 | info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); | |
493 | info->low.rm_blockcount = 0; | |
494 | xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); | |
495 | ||
496 | info->high.rm_startblock = end_fsb; | |
497 | error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]); | |
498 | if (error) | |
499 | return error; | |
500 | info->high.rm_offset = XFS_BB_TO_FSBT(mp, keys[1].fmr_offset); | |
501 | info->high.rm_blockcount = 0; | |
502 | xfs_getfsmap_set_irec_flags(&info->high, &keys[1]); | |
503 | ||
504 | trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low); | |
505 | trace_xfs_fsmap_high_key(mp, info->dev, info->agno, &info->high); | |
506 | ||
507 | return query_fn(tp, info); | |
508 | } | |
509 | ||
510 | /* Actually query the realtime bitmap. */ | |
511 | STATIC int | |
512 | xfs_getfsmap_rtdev_rtbitmap_query( | |
513 | struct xfs_trans *tp, | |
514 | struct xfs_getfsmap_info *info) | |
515 | { | |
232d0a24 DW |
516 | struct xfs_rtalloc_rec alow = { 0 }; |
517 | struct xfs_rtalloc_rec ahigh = { 0 }; | |
4c934c7d DW |
518 | int error; |
519 | ||
520 | xfs_ilock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED); | |
521 | ||
a0e5c435 DW |
522 | alow.ar_startext = info->low.rm_startblock; |
523 | ahigh.ar_startext = info->high.rm_startblock; | |
524 | do_div(alow.ar_startext, tp->t_mountp->m_sb.sb_rextsize); | |
525 | if (do_div(ahigh.ar_startext, tp->t_mountp->m_sb.sb_rextsize)) | |
526 | ahigh.ar_startext++; | |
4c934c7d DW |
527 | error = xfs_rtalloc_query_range(tp, &alow, &ahigh, |
528 | xfs_getfsmap_rtdev_rtbitmap_helper, info); | |
529 | if (error) | |
530 | goto err; | |
531 | ||
532 | /* Report any gaps at the end of the rtbitmap */ | |
533 | info->last = true; | |
534 | error = xfs_getfsmap_rtdev_rtbitmap_helper(tp, &ahigh, info); | |
535 | if (error) | |
536 | goto err; | |
537 | err: | |
538 | xfs_iunlock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED); | |
539 | return error; | |
540 | } | |
541 | ||
542 | /* Execute a getfsmap query against the realtime device rtbitmap. */ | |
543 | STATIC int | |
544 | xfs_getfsmap_rtdev_rtbitmap( | |
545 | struct xfs_trans *tp, | |
546 | struct xfs_fsmap *keys, | |
547 | struct xfs_getfsmap_info *info) | |
548 | { | |
549 | info->missing_owner = XFS_FMR_OWN_UNKNOWN; | |
550 | return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rtbitmap_query, | |
551 | info); | |
552 | } | |
bb9c2e54 | 553 | #endif /* CONFIG_XFS_RT */ |
4c934c7d | 554 | |
e89c0413 DW |
555 | /* Execute a getfsmap query against the regular data device. */ |
556 | STATIC int | |
557 | __xfs_getfsmap_datadev( | |
558 | struct xfs_trans *tp, | |
559 | struct xfs_fsmap *keys, | |
560 | struct xfs_getfsmap_info *info, | |
561 | int (*query_fn)(struct xfs_trans *, | |
562 | struct xfs_getfsmap_info *, | |
563 | struct xfs_btree_cur **, | |
564 | void *), | |
565 | void *priv) | |
566 | { | |
567 | struct xfs_mount *mp = tp->t_mountp; | |
568 | struct xfs_btree_cur *bt_cur = NULL; | |
569 | xfs_fsblock_t start_fsb; | |
570 | xfs_fsblock_t end_fsb; | |
571 | xfs_agnumber_t start_ag; | |
572 | xfs_agnumber_t end_ag; | |
573 | xfs_daddr_t eofs; | |
574 | int error = 0; | |
575 | ||
576 | eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); | |
577 | if (keys[0].fmr_physical >= eofs) | |
578 | return 0; | |
579 | if (keys[1].fmr_physical >= eofs) | |
580 | keys[1].fmr_physical = eofs - 1; | |
581 | start_fsb = XFS_DADDR_TO_FSB(mp, keys[0].fmr_physical); | |
582 | end_fsb = XFS_DADDR_TO_FSB(mp, keys[1].fmr_physical); | |
583 | ||
584 | /* | |
585 | * Convert the fsmap low/high keys to AG based keys. Initialize | |
586 | * low to the fsmap low key and max out the high key to the end | |
587 | * of the AG. | |
588 | */ | |
589 | info->low.rm_startblock = XFS_FSB_TO_AGBNO(mp, start_fsb); | |
590 | info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); | |
591 | error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]); | |
592 | if (error) | |
593 | return error; | |
594 | info->low.rm_blockcount = 0; | |
595 | xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); | |
596 | ||
597 | info->high.rm_startblock = -1U; | |
598 | info->high.rm_owner = ULLONG_MAX; | |
599 | info->high.rm_offset = ULLONG_MAX; | |
600 | info->high.rm_blockcount = 0; | |
601 | info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; | |
602 | ||
603 | start_ag = XFS_FSB_TO_AGNO(mp, start_fsb); | |
604 | end_ag = XFS_FSB_TO_AGNO(mp, end_fsb); | |
605 | ||
606 | /* Query each AG */ | |
607 | for (info->agno = start_ag; info->agno <= end_ag; info->agno++) { | |
608 | /* | |
609 | * Set the AG high key from the fsmap high key if this | |
610 | * is the last AG that we're querying. | |
611 | */ | |
612 | if (info->agno == end_ag) { | |
613 | info->high.rm_startblock = XFS_FSB_TO_AGBNO(mp, | |
614 | end_fsb); | |
615 | info->high.rm_offset = XFS_BB_TO_FSBT(mp, | |
616 | keys[1].fmr_offset); | |
617 | error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]); | |
618 | if (error) | |
619 | goto err; | |
620 | xfs_getfsmap_set_irec_flags(&info->high, &keys[1]); | |
621 | } | |
622 | ||
623 | if (bt_cur) { | |
624 | xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR); | |
625 | bt_cur = NULL; | |
626 | xfs_trans_brelse(tp, info->agf_bp); | |
627 | info->agf_bp = NULL; | |
628 | } | |
629 | ||
630 | error = xfs_alloc_read_agf(mp, tp, info->agno, 0, | |
631 | &info->agf_bp); | |
632 | if (error) | |
633 | goto err; | |
634 | ||
635 | trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low); | |
636 | trace_xfs_fsmap_high_key(mp, info->dev, info->agno, | |
637 | &info->high); | |
638 | ||
639 | error = query_fn(tp, info, &bt_cur, priv); | |
640 | if (error) | |
641 | goto err; | |
642 | ||
643 | /* | |
644 | * Set the AG low key to the start of the AG prior to | |
645 | * moving on to the next AG. | |
646 | */ | |
647 | if (info->agno == start_ag) { | |
648 | info->low.rm_startblock = 0; | |
649 | info->low.rm_owner = 0; | |
650 | info->low.rm_offset = 0; | |
651 | info->low.rm_flags = 0; | |
652 | } | |
653 | } | |
654 | ||
655 | /* Report any gap at the end of the AG */ | |
656 | info->last = true; | |
657 | error = query_fn(tp, info, &bt_cur, priv); | |
658 | if (error) | |
659 | goto err; | |
660 | ||
661 | err: | |
662 | if (bt_cur) | |
663 | xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR : | |
664 | XFS_BTREE_NOERROR); | |
665 | if (info->agf_bp) { | |
666 | xfs_trans_brelse(tp, info->agf_bp); | |
667 | info->agf_bp = NULL; | |
668 | } | |
669 | ||
670 | return error; | |
671 | } | |
672 | ||
673 | /* Actually query the rmap btree. */ | |
674 | STATIC int | |
675 | xfs_getfsmap_datadev_rmapbt_query( | |
676 | struct xfs_trans *tp, | |
677 | struct xfs_getfsmap_info *info, | |
678 | struct xfs_btree_cur **curpp, | |
679 | void *priv) | |
680 | { | |
681 | /* Report any gap at the end of the last AG. */ | |
682 | if (info->last) | |
683 | return xfs_getfsmap_datadev_helper(*curpp, &info->high, info); | |
684 | ||
685 | /* Allocate cursor for this AG and query_range it. */ | |
686 | *curpp = xfs_rmapbt_init_cursor(tp->t_mountp, tp, info->agf_bp, | |
687 | info->agno); | |
688 | return xfs_rmap_query_range(*curpp, &info->low, &info->high, | |
689 | xfs_getfsmap_datadev_helper, info); | |
690 | } | |
691 | ||
692 | /* Execute a getfsmap query against the regular data device rmapbt. */ | |
693 | STATIC int | |
694 | xfs_getfsmap_datadev_rmapbt( | |
695 | struct xfs_trans *tp, | |
696 | struct xfs_fsmap *keys, | |
697 | struct xfs_getfsmap_info *info) | |
698 | { | |
699 | info->missing_owner = XFS_FMR_OWN_FREE; | |
700 | return __xfs_getfsmap_datadev(tp, keys, info, | |
701 | xfs_getfsmap_datadev_rmapbt_query, NULL); | |
702 | } | |
703 | ||
a1cae728 DW |
704 | /* Actually query the bno btree. */ |
705 | STATIC int | |
706 | xfs_getfsmap_datadev_bnobt_query( | |
707 | struct xfs_trans *tp, | |
708 | struct xfs_getfsmap_info *info, | |
709 | struct xfs_btree_cur **curpp, | |
710 | void *priv) | |
711 | { | |
712 | struct xfs_alloc_rec_incore *key = priv; | |
713 | ||
714 | /* Report any gap at the end of the last AG. */ | |
715 | if (info->last) | |
716 | return xfs_getfsmap_datadev_bnobt_helper(*curpp, &key[1], info); | |
717 | ||
718 | /* Allocate cursor for this AG and query_range it. */ | |
719 | *curpp = xfs_allocbt_init_cursor(tp->t_mountp, tp, info->agf_bp, | |
720 | info->agno, XFS_BTNUM_BNO); | |
721 | key->ar_startblock = info->low.rm_startblock; | |
722 | key[1].ar_startblock = info->high.rm_startblock; | |
723 | return xfs_alloc_query_range(*curpp, key, &key[1], | |
724 | xfs_getfsmap_datadev_bnobt_helper, info); | |
725 | } | |
726 | ||
727 | /* Execute a getfsmap query against the regular data device's bnobt. */ | |
728 | STATIC int | |
729 | xfs_getfsmap_datadev_bnobt( | |
730 | struct xfs_trans *tp, | |
731 | struct xfs_fsmap *keys, | |
732 | struct xfs_getfsmap_info *info) | |
733 | { | |
734 | struct xfs_alloc_rec_incore akeys[2]; | |
735 | ||
736 | info->missing_owner = XFS_FMR_OWN_UNKNOWN; | |
737 | return __xfs_getfsmap_datadev(tp, keys, info, | |
738 | xfs_getfsmap_datadev_bnobt_query, &akeys[0]); | |
739 | } | |
740 | ||
e89c0413 DW |
741 | /* Do we recognize the device? */ |
742 | STATIC bool | |
743 | xfs_getfsmap_is_valid_device( | |
744 | struct xfs_mount *mp, | |
745 | struct xfs_fsmap *fm) | |
746 | { | |
747 | if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX || | |
748 | fm->fmr_device == new_encode_dev(mp->m_ddev_targp->bt_dev)) | |
749 | return true; | |
750 | if (mp->m_logdev_targp && | |
751 | fm->fmr_device == new_encode_dev(mp->m_logdev_targp->bt_dev)) | |
752 | return true; | |
4c934c7d DW |
753 | if (mp->m_rtdev_targp && |
754 | fm->fmr_device == new_encode_dev(mp->m_rtdev_targp->bt_dev)) | |
755 | return true; | |
e89c0413 DW |
756 | return false; |
757 | } | |
758 | ||
759 | /* Ensure that the low key is less than the high key. */ | |
760 | STATIC bool | |
761 | xfs_getfsmap_check_keys( | |
762 | struct xfs_fsmap *low_key, | |
763 | struct xfs_fsmap *high_key) | |
764 | { | |
765 | if (low_key->fmr_device > high_key->fmr_device) | |
766 | return false; | |
767 | if (low_key->fmr_device < high_key->fmr_device) | |
768 | return true; | |
769 | ||
770 | if (low_key->fmr_physical > high_key->fmr_physical) | |
771 | return false; | |
772 | if (low_key->fmr_physical < high_key->fmr_physical) | |
773 | return true; | |
774 | ||
775 | if (low_key->fmr_owner > high_key->fmr_owner) | |
776 | return false; | |
777 | if (low_key->fmr_owner < high_key->fmr_owner) | |
778 | return true; | |
779 | ||
780 | if (low_key->fmr_offset > high_key->fmr_offset) | |
781 | return false; | |
782 | if (low_key->fmr_offset < high_key->fmr_offset) | |
783 | return true; | |
784 | ||
785 | return false; | |
786 | } | |
787 | ||
bb9c2e54 DC |
788 | /* |
789 | * There are only two devices if we didn't configure RT devices at build time. | |
790 | */ | |
791 | #ifdef CONFIG_XFS_RT | |
4c934c7d | 792 | #define XFS_GETFSMAP_DEVS 3 |
bb9c2e54 DC |
793 | #else |
794 | #define XFS_GETFSMAP_DEVS 2 | |
795 | #endif /* CONFIG_XFS_RT */ | |
796 | ||
e89c0413 DW |
797 | /* |
798 | * Get filesystem's extents as described in head, and format for | |
799 | * output. Calls formatter to fill the user's buffer until all | |
800 | * extents are mapped, until the passed-in head->fmh_count slots have | |
801 | * been filled, or until the formatter short-circuits the loop, if it | |
802 | * is tracking filled-in extents on its own. | |
803 | * | |
804 | * Key to Confusion | |
805 | * ---------------- | |
806 | * There are multiple levels of keys and counters at work here: | |
807 | * xfs_fsmap_head.fmh_keys -- low and high fsmap keys passed in; | |
808 | * these reflect fs-wide sector addrs. | |
809 | * dkeys -- fmh_keys used to query each device; | |
810 | * these are fmh_keys but w/ the low key | |
811 | * bumped up by fmr_length. | |
812 | * xfs_getfsmap_info.next_daddr -- next disk addr we expect to see; this | |
813 | * is how we detect gaps in the fsmap | |
814 | records and report them. | |
815 | * xfs_getfsmap_info.low/high -- per-AG low/high keys computed from | |
816 | * dkeys; used to query the metadata. | |
817 | */ | |
818 | int | |
819 | xfs_getfsmap( | |
820 | struct xfs_mount *mp, | |
821 | struct xfs_fsmap_head *head, | |
822 | xfs_fsmap_format_t formatter, | |
823 | void *arg) | |
824 | { | |
825 | struct xfs_trans *tp = NULL; | |
826 | struct xfs_fsmap dkeys[2]; /* per-dev keys */ | |
827 | struct xfs_getfsmap_dev handlers[XFS_GETFSMAP_DEVS]; | |
fad5656b | 828 | struct xfs_getfsmap_info info = { NULL }; |
ea9a46e1 | 829 | bool use_rmap; |
e89c0413 DW |
830 | int i; |
831 | int error = 0; | |
832 | ||
e89c0413 DW |
833 | if (head->fmh_iflags & ~FMH_IF_VALID) |
834 | return -EINVAL; | |
835 | if (!xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[0]) || | |
836 | !xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[1])) | |
837 | return -EINVAL; | |
838 | ||
ea9a46e1 DW |
839 | use_rmap = capable(CAP_SYS_ADMIN) && |
840 | xfs_sb_version_hasrmapbt(&mp->m_sb); | |
e89c0413 DW |
841 | head->fmh_entries = 0; |
842 | ||
843 | /* Set up our device handlers. */ | |
844 | memset(handlers, 0, sizeof(handlers)); | |
845 | handlers[0].dev = new_encode_dev(mp->m_ddev_targp->bt_dev); | |
ea9a46e1 | 846 | if (use_rmap) |
a1cae728 DW |
847 | handlers[0].fn = xfs_getfsmap_datadev_rmapbt; |
848 | else | |
849 | handlers[0].fn = xfs_getfsmap_datadev_bnobt; | |
e89c0413 DW |
850 | if (mp->m_logdev_targp != mp->m_ddev_targp) { |
851 | handlers[1].dev = new_encode_dev(mp->m_logdev_targp->bt_dev); | |
852 | handlers[1].fn = xfs_getfsmap_logdev; | |
853 | } | |
bb9c2e54 | 854 | #ifdef CONFIG_XFS_RT |
4c934c7d DW |
855 | if (mp->m_rtdev_targp) { |
856 | handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev); | |
857 | handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap; | |
858 | } | |
bb9c2e54 | 859 | #endif /* CONFIG_XFS_RT */ |
e89c0413 DW |
860 | |
861 | xfs_sort(handlers, XFS_GETFSMAP_DEVS, sizeof(struct xfs_getfsmap_dev), | |
862 | xfs_getfsmap_dev_compare); | |
863 | ||
864 | /* | |
865 | * To continue where we left off, we allow userspace to use the | |
866 | * last mapping from a previous call as the low key of the next. | |
867 | * This is identified by a non-zero length in the low key. We | |
868 | * have to increment the low key in this scenario to ensure we | |
869 | * don't return the same mapping again, and instead return the | |
870 | * very next mapping. | |
871 | * | |
872 | * If the low key mapping refers to file data, the same physical | |
873 | * blocks could be mapped to several other files/offsets. | |
874 | * According to rmapbt record ordering, the minimal next | |
875 | * possible record for the block range is the next starting | |
876 | * offset in the same inode. Therefore, bump the file offset to | |
877 | * continue the search appropriately. For all other low key | |
878 | * mapping types (attr blocks, metadata), bump the physical | |
879 | * offset as there can be no other mapping for the same physical | |
880 | * block range. | |
881 | */ | |
882 | dkeys[0] = head->fmh_keys[0]; | |
883 | if (dkeys[0].fmr_flags & (FMR_OF_SPECIAL_OWNER | FMR_OF_EXTENT_MAP)) { | |
884 | dkeys[0].fmr_physical += dkeys[0].fmr_length; | |
885 | dkeys[0].fmr_owner = 0; | |
886 | if (dkeys[0].fmr_offset) | |
887 | return -EINVAL; | |
888 | } else | |
889 | dkeys[0].fmr_offset += dkeys[0].fmr_length; | |
890 | dkeys[0].fmr_length = 0; | |
891 | memset(&dkeys[1], 0xFF, sizeof(struct xfs_fsmap)); | |
892 | ||
893 | if (!xfs_getfsmap_check_keys(dkeys, &head->fmh_keys[1])) | |
894 | return -EINVAL; | |
895 | ||
896 | info.next_daddr = head->fmh_keys[0].fmr_physical + | |
897 | head->fmh_keys[0].fmr_length; | |
898 | info.formatter = formatter; | |
899 | info.format_arg = arg; | |
900 | info.head = head; | |
901 | ||
902 | /* For each device we support... */ | |
903 | for (i = 0; i < XFS_GETFSMAP_DEVS; i++) { | |
904 | /* Is this device within the range the user asked for? */ | |
905 | if (!handlers[i].fn) | |
906 | continue; | |
907 | if (head->fmh_keys[0].fmr_device > handlers[i].dev) | |
908 | continue; | |
909 | if (head->fmh_keys[1].fmr_device < handlers[i].dev) | |
910 | break; | |
911 | ||
912 | /* | |
913 | * If this device number matches the high key, we have | |
914 | * to pass the high key to the handler to limit the | |
915 | * query results. If the device number exceeds the | |
916 | * low key, zero out the low key so that we get | |
917 | * everything from the beginning. | |
918 | */ | |
919 | if (handlers[i].dev == head->fmh_keys[1].fmr_device) | |
920 | dkeys[1] = head->fmh_keys[1]; | |
921 | if (handlers[i].dev > head->fmh_keys[0].fmr_device) | |
922 | memset(&dkeys[0], 0, sizeof(struct xfs_fsmap)); | |
923 | ||
924 | error = xfs_trans_alloc_empty(mp, &tp); | |
925 | if (error) | |
926 | break; | |
927 | ||
928 | info.dev = handlers[i].dev; | |
929 | info.last = false; | |
930 | info.agno = NULLAGNUMBER; | |
931 | error = handlers[i].fn(tp, dkeys, &info); | |
932 | if (error) | |
933 | break; | |
934 | xfs_trans_cancel(tp); | |
935 | tp = NULL; | |
936 | info.next_daddr = 0; | |
937 | } | |
938 | ||
939 | if (tp) | |
940 | xfs_trans_cancel(tp); | |
941 | head->fmh_oflags = FMH_OF_DEV_T; | |
942 | return error; | |
943 | } |