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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" | |
e89c0413 | 12 | #include "xfs_mount.h" |
e89c0413 DW |
13 | #include "xfs_inode.h" |
14 | #include "xfs_trans.h" | |
e89c0413 DW |
15 | #include "xfs_btree.h" |
16 | #include "xfs_rmap_btree.h" | |
17 | #include "xfs_trace.h" | |
e89c0413 DW |
18 | #include "xfs_rmap.h" |
19 | #include "xfs_alloc.h" | |
20 | #include "xfs_bit.h" | |
21 | #include <linux/fsmap.h> | |
22 | #include "xfs_fsmap.h" | |
23 | #include "xfs_refcount.h" | |
24 | #include "xfs_refcount_btree.h" | |
a1cae728 | 25 | #include "xfs_alloc_btree.h" |
4c934c7d | 26 | #include "xfs_rtalloc.h" |
e89c0413 DW |
27 | |
28 | /* Convert an xfs_fsmap to an fsmap. */ | |
29 | void | |
30 | xfs_fsmap_from_internal( | |
31 | struct fsmap *dest, | |
32 | struct xfs_fsmap *src) | |
33 | { | |
34 | dest->fmr_device = src->fmr_device; | |
35 | dest->fmr_flags = src->fmr_flags; | |
36 | dest->fmr_physical = BBTOB(src->fmr_physical); | |
37 | dest->fmr_owner = src->fmr_owner; | |
38 | dest->fmr_offset = BBTOB(src->fmr_offset); | |
39 | dest->fmr_length = BBTOB(src->fmr_length); | |
40 | dest->fmr_reserved[0] = 0; | |
41 | dest->fmr_reserved[1] = 0; | |
42 | dest->fmr_reserved[2] = 0; | |
43 | } | |
44 | ||
45 | /* Convert an fsmap to an xfs_fsmap. */ | |
46 | void | |
47 | xfs_fsmap_to_internal( | |
48 | struct xfs_fsmap *dest, | |
49 | struct fsmap *src) | |
50 | { | |
51 | dest->fmr_device = src->fmr_device; | |
52 | dest->fmr_flags = src->fmr_flags; | |
53 | dest->fmr_physical = BTOBBT(src->fmr_physical); | |
54 | dest->fmr_owner = src->fmr_owner; | |
55 | dest->fmr_offset = BTOBBT(src->fmr_offset); | |
56 | dest->fmr_length = BTOBBT(src->fmr_length); | |
57 | } | |
58 | ||
59 | /* Convert an fsmap owner into an rmapbt owner. */ | |
60 | static int | |
61 | xfs_fsmap_owner_to_rmap( | |
62 | struct xfs_rmap_irec *dest, | |
63 | struct xfs_fsmap *src) | |
64 | { | |
65 | if (!(src->fmr_flags & FMR_OF_SPECIAL_OWNER)) { | |
66 | dest->rm_owner = src->fmr_owner; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | switch (src->fmr_owner) { | |
71 | case 0: /* "lowest owner id possible" */ | |
72 | case -1ULL: /* "highest owner id possible" */ | |
73 | dest->rm_owner = 0; | |
74 | break; | |
75 | case XFS_FMR_OWN_FREE: | |
76 | dest->rm_owner = XFS_RMAP_OWN_NULL; | |
77 | break; | |
78 | case XFS_FMR_OWN_UNKNOWN: | |
79 | dest->rm_owner = XFS_RMAP_OWN_UNKNOWN; | |
80 | break; | |
81 | case XFS_FMR_OWN_FS: | |
82 | dest->rm_owner = XFS_RMAP_OWN_FS; | |
83 | break; | |
84 | case XFS_FMR_OWN_LOG: | |
85 | dest->rm_owner = XFS_RMAP_OWN_LOG; | |
86 | break; | |
87 | case XFS_FMR_OWN_AG: | |
88 | dest->rm_owner = XFS_RMAP_OWN_AG; | |
89 | break; | |
90 | case XFS_FMR_OWN_INOBT: | |
91 | dest->rm_owner = XFS_RMAP_OWN_INOBT; | |
92 | break; | |
93 | case XFS_FMR_OWN_INODES: | |
94 | dest->rm_owner = XFS_RMAP_OWN_INODES; | |
95 | break; | |
96 | case XFS_FMR_OWN_REFC: | |
97 | dest->rm_owner = XFS_RMAP_OWN_REFC; | |
98 | break; | |
99 | case XFS_FMR_OWN_COW: | |
100 | dest->rm_owner = XFS_RMAP_OWN_COW; | |
101 | break; | |
102 | case XFS_FMR_OWN_DEFECTIVE: /* not implemented */ | |
103 | /* fall through */ | |
104 | default: | |
105 | return -EINVAL; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /* Convert an rmapbt owner into an fsmap owner. */ | |
111 | static int | |
112 | xfs_fsmap_owner_from_rmap( | |
113 | struct xfs_fsmap *dest, | |
114 | struct xfs_rmap_irec *src) | |
115 | { | |
116 | dest->fmr_flags = 0; | |
117 | if (!XFS_RMAP_NON_INODE_OWNER(src->rm_owner)) { | |
118 | dest->fmr_owner = src->rm_owner; | |
119 | return 0; | |
120 | } | |
121 | dest->fmr_flags |= FMR_OF_SPECIAL_OWNER; | |
122 | ||
123 | switch (src->rm_owner) { | |
124 | case XFS_RMAP_OWN_FS: | |
125 | dest->fmr_owner = XFS_FMR_OWN_FS; | |
126 | break; | |
127 | case XFS_RMAP_OWN_LOG: | |
128 | dest->fmr_owner = XFS_FMR_OWN_LOG; | |
129 | break; | |
130 | case XFS_RMAP_OWN_AG: | |
131 | dest->fmr_owner = XFS_FMR_OWN_AG; | |
132 | break; | |
133 | case XFS_RMAP_OWN_INOBT: | |
134 | dest->fmr_owner = XFS_FMR_OWN_INOBT; | |
135 | break; | |
136 | case XFS_RMAP_OWN_INODES: | |
137 | dest->fmr_owner = XFS_FMR_OWN_INODES; | |
138 | break; | |
139 | case XFS_RMAP_OWN_REFC: | |
140 | dest->fmr_owner = XFS_FMR_OWN_REFC; | |
141 | break; | |
142 | case XFS_RMAP_OWN_COW: | |
143 | dest->fmr_owner = XFS_FMR_OWN_COW; | |
144 | break; | |
a1cae728 DW |
145 | case XFS_RMAP_OWN_NULL: /* "free" */ |
146 | dest->fmr_owner = XFS_FMR_OWN_FREE; | |
147 | break; | |
e89c0413 DW |
148 | default: |
149 | return -EFSCORRUPTED; | |
150 | } | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* getfsmap query state */ | |
155 | struct xfs_getfsmap_info { | |
156 | struct xfs_fsmap_head *head; | |
157 | xfs_fsmap_format_t formatter; /* formatting fn */ | |
158 | void *format_arg; /* format buffer */ | |
159 | struct xfs_buf *agf_bp; /* AGF, for refcount queries */ | |
160 | xfs_daddr_t next_daddr; /* next daddr we expect */ | |
161 | u64 missing_owner; /* owner of holes */ | |
162 | u32 dev; /* device id */ | |
163 | xfs_agnumber_t agno; /* AG number, if applicable */ | |
164 | struct xfs_rmap_irec low; /* low rmap key */ | |
165 | struct xfs_rmap_irec high; /* high rmap key */ | |
166 | bool last; /* last extent? */ | |
167 | }; | |
168 | ||
169 | /* Associate a device with a getfsmap handler. */ | |
170 | struct xfs_getfsmap_dev { | |
171 | u32 dev; | |
172 | int (*fn)(struct xfs_trans *tp, | |
173 | struct xfs_fsmap *keys, | |
174 | struct xfs_getfsmap_info *info); | |
175 | }; | |
176 | ||
177 | /* Compare two getfsmap device handlers. */ | |
178 | static int | |
179 | xfs_getfsmap_dev_compare( | |
180 | const void *p1, | |
181 | const void *p2) | |
182 | { | |
183 | const struct xfs_getfsmap_dev *d1 = p1; | |
184 | const struct xfs_getfsmap_dev *d2 = p2; | |
185 | ||
186 | return d1->dev - d2->dev; | |
187 | } | |
188 | ||
189 | /* Decide if this mapping is shared. */ | |
190 | STATIC int | |
191 | xfs_getfsmap_is_shared( | |
192 | struct xfs_trans *tp, | |
193 | struct xfs_getfsmap_info *info, | |
194 | struct xfs_rmap_irec *rec, | |
195 | bool *stat) | |
196 | { | |
197 | struct xfs_mount *mp = tp->t_mountp; | |
198 | struct xfs_btree_cur *cur; | |
199 | xfs_agblock_t fbno; | |
200 | xfs_extlen_t flen; | |
201 | int error; | |
202 | ||
203 | *stat = false; | |
204 | if (!xfs_sb_version_hasreflink(&mp->m_sb)) | |
205 | return 0; | |
206 | /* rt files will have agno set to NULLAGNUMBER */ | |
207 | if (info->agno == NULLAGNUMBER) | |
208 | return 0; | |
209 | ||
210 | /* Are there any shared blocks here? */ | |
211 | flen = 0; | |
212 | cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp, | |
ed7ef8e5 | 213 | info->agno); |
e89c0413 DW |
214 | |
215 | error = xfs_refcount_find_shared(cur, rec->rm_startblock, | |
216 | rec->rm_blockcount, &fbno, &flen, false); | |
217 | ||
0b04b6b8 | 218 | xfs_btree_del_cursor(cur, error); |
e89c0413 DW |
219 | if (error) |
220 | return error; | |
221 | ||
222 | *stat = flen > 0; | |
223 | return 0; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Format a reverse mapping for getfsmap, having translated rm_startblock | |
228 | * into the appropriate daddr units. | |
229 | */ | |
230 | STATIC int | |
231 | xfs_getfsmap_helper( | |
232 | struct xfs_trans *tp, | |
233 | struct xfs_getfsmap_info *info, | |
234 | struct xfs_rmap_irec *rec, | |
235 | xfs_daddr_t rec_daddr) | |
236 | { | |
237 | struct xfs_fsmap fmr; | |
238 | struct xfs_mount *mp = tp->t_mountp; | |
239 | bool shared; | |
240 | int error; | |
241 | ||
242 | if (fatal_signal_pending(current)) | |
243 | return -EINTR; | |
244 | ||
245 | /* | |
246 | * Filter out records that start before our startpoint, if the | |
247 | * caller requested that. | |
248 | */ | |
249 | if (xfs_rmap_compare(rec, &info->low) < 0) { | |
250 | rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
251 | if (info->next_daddr < rec_daddr) | |
252 | info->next_daddr = rec_daddr; | |
39ee2239 | 253 | return 0; |
e89c0413 DW |
254 | } |
255 | ||
256 | /* Are we just counting mappings? */ | |
257 | if (info->head->fmh_count == 0) { | |
258 | if (rec_daddr > info->next_daddr) | |
259 | info->head->fmh_entries++; | |
260 | ||
261 | if (info->last) | |
39ee2239 | 262 | return 0; |
e89c0413 DW |
263 | |
264 | info->head->fmh_entries++; | |
265 | ||
266 | rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
267 | if (info->next_daddr < rec_daddr) | |
268 | info->next_daddr = rec_daddr; | |
39ee2239 | 269 | return 0; |
e89c0413 DW |
270 | } |
271 | ||
272 | /* | |
273 | * If the record starts past the last physical block we saw, | |
274 | * then we've found a gap. Report the gap as being owned by | |
275 | * whatever the caller specified is the missing owner. | |
276 | */ | |
277 | if (rec_daddr > info->next_daddr) { | |
278 | if (info->head->fmh_entries >= info->head->fmh_count) | |
e7ee96df | 279 | return -ECANCELED; |
e89c0413 DW |
280 | |
281 | fmr.fmr_device = info->dev; | |
282 | fmr.fmr_physical = info->next_daddr; | |
283 | fmr.fmr_owner = info->missing_owner; | |
284 | fmr.fmr_offset = 0; | |
285 | fmr.fmr_length = rec_daddr - info->next_daddr; | |
286 | fmr.fmr_flags = FMR_OF_SPECIAL_OWNER; | |
287 | error = info->formatter(&fmr, info->format_arg); | |
288 | if (error) | |
289 | return error; | |
290 | info->head->fmh_entries++; | |
291 | } | |
292 | ||
293 | if (info->last) | |
294 | goto out; | |
295 | ||
296 | /* Fill out the extent we found */ | |
297 | if (info->head->fmh_entries >= info->head->fmh_count) | |
e7ee96df | 298 | return -ECANCELED; |
e89c0413 DW |
299 | |
300 | trace_xfs_fsmap_mapping(mp, info->dev, info->agno, rec); | |
301 | ||
302 | fmr.fmr_device = info->dev; | |
303 | fmr.fmr_physical = rec_daddr; | |
304 | error = xfs_fsmap_owner_from_rmap(&fmr, rec); | |
305 | if (error) | |
306 | return error; | |
307 | fmr.fmr_offset = XFS_FSB_TO_BB(mp, rec->rm_offset); | |
308 | fmr.fmr_length = XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
309 | if (rec->rm_flags & XFS_RMAP_UNWRITTEN) | |
310 | fmr.fmr_flags |= FMR_OF_PREALLOC; | |
311 | if (rec->rm_flags & XFS_RMAP_ATTR_FORK) | |
312 | fmr.fmr_flags |= FMR_OF_ATTR_FORK; | |
313 | if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK) | |
314 | fmr.fmr_flags |= FMR_OF_EXTENT_MAP; | |
315 | if (fmr.fmr_flags == 0) { | |
316 | error = xfs_getfsmap_is_shared(tp, info, rec, &shared); | |
317 | if (error) | |
318 | return error; | |
319 | if (shared) | |
320 | fmr.fmr_flags |= FMR_OF_SHARED; | |
321 | } | |
322 | error = info->formatter(&fmr, info->format_arg); | |
323 | if (error) | |
324 | return error; | |
325 | info->head->fmh_entries++; | |
326 | ||
327 | out: | |
328 | rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); | |
329 | if (info->next_daddr < rec_daddr) | |
330 | info->next_daddr = rec_daddr; | |
39ee2239 | 331 | return 0; |
e89c0413 DW |
332 | } |
333 | ||
334 | /* Transform a rmapbt irec into a fsmap */ | |
335 | STATIC int | |
336 | xfs_getfsmap_datadev_helper( | |
337 | struct xfs_btree_cur *cur, | |
338 | struct xfs_rmap_irec *rec, | |
339 | void *priv) | |
340 | { | |
341 | struct xfs_mount *mp = cur->bc_mp; | |
342 | struct xfs_getfsmap_info *info = priv; | |
343 | xfs_fsblock_t fsb; | |
344 | xfs_daddr_t rec_daddr; | |
345 | ||
346 | fsb = XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, rec->rm_startblock); | |
347 | rec_daddr = XFS_FSB_TO_DADDR(mp, fsb); | |
348 | ||
349 | return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr); | |
350 | } | |
351 | ||
a1cae728 DW |
352 | /* Transform a bnobt irec into a fsmap */ |
353 | STATIC int | |
354 | xfs_getfsmap_datadev_bnobt_helper( | |
355 | struct xfs_btree_cur *cur, | |
356 | struct xfs_alloc_rec_incore *rec, | |
357 | void *priv) | |
358 | { | |
359 | struct xfs_mount *mp = cur->bc_mp; | |
360 | struct xfs_getfsmap_info *info = priv; | |
361 | struct xfs_rmap_irec irec; | |
362 | xfs_daddr_t rec_daddr; | |
363 | ||
364 | rec_daddr = XFS_AGB_TO_DADDR(mp, cur->bc_private.a.agno, | |
365 | rec->ar_startblock); | |
366 | ||
367 | irec.rm_startblock = rec->ar_startblock; | |
368 | irec.rm_blockcount = rec->ar_blockcount; | |
369 | irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */ | |
370 | irec.rm_offset = 0; | |
371 | irec.rm_flags = 0; | |
372 | ||
373 | return xfs_getfsmap_helper(cur->bc_tp, info, &irec, rec_daddr); | |
374 | } | |
375 | ||
e89c0413 DW |
376 | /* Set rmap flags based on the getfsmap flags */ |
377 | static void | |
378 | xfs_getfsmap_set_irec_flags( | |
379 | struct xfs_rmap_irec *irec, | |
380 | struct xfs_fsmap *fmr) | |
381 | { | |
382 | irec->rm_flags = 0; | |
383 | if (fmr->fmr_flags & FMR_OF_ATTR_FORK) | |
384 | irec->rm_flags |= XFS_RMAP_ATTR_FORK; | |
385 | if (fmr->fmr_flags & FMR_OF_EXTENT_MAP) | |
386 | irec->rm_flags |= XFS_RMAP_BMBT_BLOCK; | |
387 | if (fmr->fmr_flags & FMR_OF_PREALLOC) | |
388 | irec->rm_flags |= XFS_RMAP_UNWRITTEN; | |
389 | } | |
390 | ||
391 | /* Execute a getfsmap query against the log device. */ | |
392 | STATIC int | |
393 | xfs_getfsmap_logdev( | |
394 | struct xfs_trans *tp, | |
395 | struct xfs_fsmap *keys, | |
396 | struct xfs_getfsmap_info *info) | |
397 | { | |
398 | struct xfs_mount *mp = tp->t_mountp; | |
399 | struct xfs_rmap_irec rmap; | |
400 | int error; | |
401 | ||
402 | /* Set up search keys */ | |
403 | info->low.rm_startblock = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical); | |
404 | info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); | |
405 | error = xfs_fsmap_owner_to_rmap(&info->low, keys); | |
406 | if (error) | |
407 | return error; | |
408 | info->low.rm_blockcount = 0; | |
409 | xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); | |
410 | ||
411 | error = xfs_fsmap_owner_to_rmap(&info->high, keys + 1); | |
412 | if (error) | |
413 | return error; | |
414 | info->high.rm_startblock = -1U; | |
415 | info->high.rm_owner = ULLONG_MAX; | |
416 | info->high.rm_offset = ULLONG_MAX; | |
417 | info->high.rm_blockcount = 0; | |
418 | info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; | |
419 | info->missing_owner = XFS_FMR_OWN_FREE; | |
420 | ||
421 | trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low); | |
422 | trace_xfs_fsmap_high_key(mp, info->dev, info->agno, &info->high); | |
423 | ||
424 | if (keys[0].fmr_physical > 0) | |
425 | return 0; | |
426 | ||
427 | /* Fabricate an rmap entry for the external log device. */ | |
428 | rmap.rm_startblock = 0; | |
429 | rmap.rm_blockcount = mp->m_sb.sb_logblocks; | |
430 | rmap.rm_owner = XFS_RMAP_OWN_LOG; | |
431 | rmap.rm_offset = 0; | |
432 | rmap.rm_flags = 0; | |
433 | ||
434 | return xfs_getfsmap_helper(tp, info, &rmap, 0); | |
435 | } | |
436 | ||
785545c8 AB |
437 | #ifdef CONFIG_XFS_RT |
438 | /* Transform a rtbitmap "record" into a fsmap */ | |
439 | STATIC int | |
440 | xfs_getfsmap_rtdev_rtbitmap_helper( | |
441 | struct xfs_trans *tp, | |
442 | struct xfs_rtalloc_rec *rec, | |
443 | void *priv) | |
444 | { | |
445 | struct xfs_mount *mp = tp->t_mountp; | |
446 | struct xfs_getfsmap_info *info = priv; | |
447 | struct xfs_rmap_irec irec; | |
448 | xfs_daddr_t rec_daddr; | |
449 | ||
a0e5c435 DW |
450 | irec.rm_startblock = rec->ar_startext * mp->m_sb.sb_rextsize; |
451 | rec_daddr = XFS_FSB_TO_BB(mp, irec.rm_startblock); | |
452 | irec.rm_blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize; | |
785545c8 AB |
453 | irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */ |
454 | irec.rm_offset = 0; | |
455 | irec.rm_flags = 0; | |
456 | ||
457 | return xfs_getfsmap_helper(tp, info, &irec, rec_daddr); | |
458 | } | |
459 | ||
4c934c7d DW |
460 | /* Execute a getfsmap query against the realtime device. */ |
461 | STATIC int | |
462 | __xfs_getfsmap_rtdev( | |
463 | struct xfs_trans *tp, | |
464 | struct xfs_fsmap *keys, | |
465 | int (*query_fn)(struct xfs_trans *, | |
466 | struct xfs_getfsmap_info *), | |
467 | struct xfs_getfsmap_info *info) | |
468 | { | |
469 | struct xfs_mount *mp = tp->t_mountp; | |
470 | xfs_fsblock_t start_fsb; | |
471 | xfs_fsblock_t end_fsb; | |
472 | xfs_daddr_t eofs; | |
473 | int error = 0; | |
474 | ||
475 | eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks); | |
476 | if (keys[0].fmr_physical >= eofs) | |
477 | return 0; | |
478 | if (keys[1].fmr_physical >= eofs) | |
479 | keys[1].fmr_physical = eofs - 1; | |
480 | start_fsb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical); | |
481 | end_fsb = XFS_BB_TO_FSB(mp, keys[1].fmr_physical); | |
482 | ||
483 | /* Set up search keys */ | |
484 | info->low.rm_startblock = start_fsb; | |
485 | error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]); | |
486 | if (error) | |
487 | return error; | |
488 | info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); | |
489 | info->low.rm_blockcount = 0; | |
490 | xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); | |
491 | ||
492 | info->high.rm_startblock = end_fsb; | |
493 | error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]); | |
494 | if (error) | |
495 | return error; | |
496 | info->high.rm_offset = XFS_BB_TO_FSBT(mp, keys[1].fmr_offset); | |
497 | info->high.rm_blockcount = 0; | |
498 | xfs_getfsmap_set_irec_flags(&info->high, &keys[1]); | |
499 | ||
500 | trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low); | |
501 | trace_xfs_fsmap_high_key(mp, info->dev, info->agno, &info->high); | |
502 | ||
503 | return query_fn(tp, info); | |
504 | } | |
505 | ||
506 | /* Actually query the realtime bitmap. */ | |
507 | STATIC int | |
508 | xfs_getfsmap_rtdev_rtbitmap_query( | |
509 | struct xfs_trans *tp, | |
510 | struct xfs_getfsmap_info *info) | |
511 | { | |
232d0a24 DW |
512 | struct xfs_rtalloc_rec alow = { 0 }; |
513 | struct xfs_rtalloc_rec ahigh = { 0 }; | |
4c934c7d DW |
514 | int error; |
515 | ||
516 | xfs_ilock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED); | |
517 | ||
a0e5c435 DW |
518 | alow.ar_startext = info->low.rm_startblock; |
519 | ahigh.ar_startext = info->high.rm_startblock; | |
520 | do_div(alow.ar_startext, tp->t_mountp->m_sb.sb_rextsize); | |
521 | if (do_div(ahigh.ar_startext, tp->t_mountp->m_sb.sb_rextsize)) | |
522 | ahigh.ar_startext++; | |
4c934c7d DW |
523 | error = xfs_rtalloc_query_range(tp, &alow, &ahigh, |
524 | xfs_getfsmap_rtdev_rtbitmap_helper, info); | |
525 | if (error) | |
526 | goto err; | |
527 | ||
528 | /* Report any gaps at the end of the rtbitmap */ | |
529 | info->last = true; | |
530 | error = xfs_getfsmap_rtdev_rtbitmap_helper(tp, &ahigh, info); | |
531 | if (error) | |
532 | goto err; | |
533 | err: | |
534 | xfs_iunlock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED); | |
535 | return error; | |
536 | } | |
537 | ||
538 | /* Execute a getfsmap query against the realtime device rtbitmap. */ | |
539 | STATIC int | |
540 | xfs_getfsmap_rtdev_rtbitmap( | |
541 | struct xfs_trans *tp, | |
542 | struct xfs_fsmap *keys, | |
543 | struct xfs_getfsmap_info *info) | |
544 | { | |
545 | info->missing_owner = XFS_FMR_OWN_UNKNOWN; | |
546 | return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rtbitmap_query, | |
547 | info); | |
548 | } | |
bb9c2e54 | 549 | #endif /* CONFIG_XFS_RT */ |
4c934c7d | 550 | |
e89c0413 DW |
551 | /* Execute a getfsmap query against the regular data device. */ |
552 | STATIC int | |
553 | __xfs_getfsmap_datadev( | |
554 | struct xfs_trans *tp, | |
555 | struct xfs_fsmap *keys, | |
556 | struct xfs_getfsmap_info *info, | |
557 | int (*query_fn)(struct xfs_trans *, | |
558 | struct xfs_getfsmap_info *, | |
559 | struct xfs_btree_cur **, | |
560 | void *), | |
561 | void *priv) | |
562 | { | |
563 | struct xfs_mount *mp = tp->t_mountp; | |
564 | struct xfs_btree_cur *bt_cur = NULL; | |
565 | xfs_fsblock_t start_fsb; | |
566 | xfs_fsblock_t end_fsb; | |
567 | xfs_agnumber_t start_ag; | |
568 | xfs_agnumber_t end_ag; | |
569 | xfs_daddr_t eofs; | |
570 | int error = 0; | |
571 | ||
572 | eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); | |
573 | if (keys[0].fmr_physical >= eofs) | |
574 | return 0; | |
575 | if (keys[1].fmr_physical >= eofs) | |
576 | keys[1].fmr_physical = eofs - 1; | |
577 | start_fsb = XFS_DADDR_TO_FSB(mp, keys[0].fmr_physical); | |
578 | end_fsb = XFS_DADDR_TO_FSB(mp, keys[1].fmr_physical); | |
579 | ||
580 | /* | |
581 | * Convert the fsmap low/high keys to AG based keys. Initialize | |
582 | * low to the fsmap low key and max out the high key to the end | |
583 | * of the AG. | |
584 | */ | |
585 | info->low.rm_startblock = XFS_FSB_TO_AGBNO(mp, start_fsb); | |
586 | info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); | |
587 | error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]); | |
588 | if (error) | |
589 | return error; | |
590 | info->low.rm_blockcount = 0; | |
591 | xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); | |
592 | ||
593 | info->high.rm_startblock = -1U; | |
594 | info->high.rm_owner = ULLONG_MAX; | |
595 | info->high.rm_offset = ULLONG_MAX; | |
596 | info->high.rm_blockcount = 0; | |
597 | info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; | |
598 | ||
599 | start_ag = XFS_FSB_TO_AGNO(mp, start_fsb); | |
600 | end_ag = XFS_FSB_TO_AGNO(mp, end_fsb); | |
601 | ||
602 | /* Query each AG */ | |
603 | for (info->agno = start_ag; info->agno <= end_ag; info->agno++) { | |
604 | /* | |
605 | * Set the AG high key from the fsmap high key if this | |
606 | * is the last AG that we're querying. | |
607 | */ | |
608 | if (info->agno == end_ag) { | |
609 | info->high.rm_startblock = XFS_FSB_TO_AGBNO(mp, | |
610 | end_fsb); | |
611 | info->high.rm_offset = XFS_BB_TO_FSBT(mp, | |
612 | keys[1].fmr_offset); | |
613 | error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]); | |
614 | if (error) | |
615 | goto err; | |
616 | xfs_getfsmap_set_irec_flags(&info->high, &keys[1]); | |
617 | } | |
618 | ||
619 | if (bt_cur) { | |
620 | xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR); | |
621 | bt_cur = NULL; | |
622 | xfs_trans_brelse(tp, info->agf_bp); | |
623 | info->agf_bp = NULL; | |
624 | } | |
625 | ||
626 | error = xfs_alloc_read_agf(mp, tp, info->agno, 0, | |
627 | &info->agf_bp); | |
628 | if (error) | |
629 | goto err; | |
630 | ||
631 | trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low); | |
632 | trace_xfs_fsmap_high_key(mp, info->dev, info->agno, | |
633 | &info->high); | |
634 | ||
635 | error = query_fn(tp, info, &bt_cur, priv); | |
636 | if (error) | |
637 | goto err; | |
638 | ||
639 | /* | |
640 | * Set the AG low key to the start of the AG prior to | |
641 | * moving on to the next AG. | |
642 | */ | |
643 | if (info->agno == start_ag) { | |
644 | info->low.rm_startblock = 0; | |
645 | info->low.rm_owner = 0; | |
646 | info->low.rm_offset = 0; | |
647 | info->low.rm_flags = 0; | |
648 | } | |
649 | } | |
650 | ||
651 | /* Report any gap at the end of the AG */ | |
652 | info->last = true; | |
653 | error = query_fn(tp, info, &bt_cur, priv); | |
654 | if (error) | |
655 | goto err; | |
656 | ||
657 | err: | |
658 | if (bt_cur) | |
659 | xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR : | |
660 | XFS_BTREE_NOERROR); | |
661 | if (info->agf_bp) { | |
662 | xfs_trans_brelse(tp, info->agf_bp); | |
663 | info->agf_bp = NULL; | |
664 | } | |
665 | ||
666 | return error; | |
667 | } | |
668 | ||
669 | /* Actually query the rmap btree. */ | |
670 | STATIC int | |
671 | xfs_getfsmap_datadev_rmapbt_query( | |
672 | struct xfs_trans *tp, | |
673 | struct xfs_getfsmap_info *info, | |
674 | struct xfs_btree_cur **curpp, | |
675 | void *priv) | |
676 | { | |
677 | /* Report any gap at the end of the last AG. */ | |
678 | if (info->last) | |
679 | return xfs_getfsmap_datadev_helper(*curpp, &info->high, info); | |
680 | ||
681 | /* Allocate cursor for this AG and query_range it. */ | |
682 | *curpp = xfs_rmapbt_init_cursor(tp->t_mountp, tp, info->agf_bp, | |
683 | info->agno); | |
684 | return xfs_rmap_query_range(*curpp, &info->low, &info->high, | |
685 | xfs_getfsmap_datadev_helper, info); | |
686 | } | |
687 | ||
688 | /* Execute a getfsmap query against the regular data device rmapbt. */ | |
689 | STATIC int | |
690 | xfs_getfsmap_datadev_rmapbt( | |
691 | struct xfs_trans *tp, | |
692 | struct xfs_fsmap *keys, | |
693 | struct xfs_getfsmap_info *info) | |
694 | { | |
695 | info->missing_owner = XFS_FMR_OWN_FREE; | |
696 | return __xfs_getfsmap_datadev(tp, keys, info, | |
697 | xfs_getfsmap_datadev_rmapbt_query, NULL); | |
698 | } | |
699 | ||
a1cae728 DW |
700 | /* Actually query the bno btree. */ |
701 | STATIC int | |
702 | xfs_getfsmap_datadev_bnobt_query( | |
703 | struct xfs_trans *tp, | |
704 | struct xfs_getfsmap_info *info, | |
705 | struct xfs_btree_cur **curpp, | |
706 | void *priv) | |
707 | { | |
708 | struct xfs_alloc_rec_incore *key = priv; | |
709 | ||
710 | /* Report any gap at the end of the last AG. */ | |
711 | if (info->last) | |
712 | return xfs_getfsmap_datadev_bnobt_helper(*curpp, &key[1], info); | |
713 | ||
714 | /* Allocate cursor for this AG and query_range it. */ | |
715 | *curpp = xfs_allocbt_init_cursor(tp->t_mountp, tp, info->agf_bp, | |
716 | info->agno, XFS_BTNUM_BNO); | |
717 | key->ar_startblock = info->low.rm_startblock; | |
718 | key[1].ar_startblock = info->high.rm_startblock; | |
719 | return xfs_alloc_query_range(*curpp, key, &key[1], | |
720 | xfs_getfsmap_datadev_bnobt_helper, info); | |
721 | } | |
722 | ||
723 | /* Execute a getfsmap query against the regular data device's bnobt. */ | |
724 | STATIC int | |
725 | xfs_getfsmap_datadev_bnobt( | |
726 | struct xfs_trans *tp, | |
727 | struct xfs_fsmap *keys, | |
728 | struct xfs_getfsmap_info *info) | |
729 | { | |
730 | struct xfs_alloc_rec_incore akeys[2]; | |
731 | ||
732 | info->missing_owner = XFS_FMR_OWN_UNKNOWN; | |
733 | return __xfs_getfsmap_datadev(tp, keys, info, | |
734 | xfs_getfsmap_datadev_bnobt_query, &akeys[0]); | |
735 | } | |
736 | ||
e89c0413 DW |
737 | /* Do we recognize the device? */ |
738 | STATIC bool | |
739 | xfs_getfsmap_is_valid_device( | |
740 | struct xfs_mount *mp, | |
741 | struct xfs_fsmap *fm) | |
742 | { | |
743 | if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX || | |
744 | fm->fmr_device == new_encode_dev(mp->m_ddev_targp->bt_dev)) | |
745 | return true; | |
746 | if (mp->m_logdev_targp && | |
747 | fm->fmr_device == new_encode_dev(mp->m_logdev_targp->bt_dev)) | |
748 | return true; | |
4c934c7d DW |
749 | if (mp->m_rtdev_targp && |
750 | fm->fmr_device == new_encode_dev(mp->m_rtdev_targp->bt_dev)) | |
751 | return true; | |
e89c0413 DW |
752 | return false; |
753 | } | |
754 | ||
755 | /* Ensure that the low key is less than the high key. */ | |
756 | STATIC bool | |
757 | xfs_getfsmap_check_keys( | |
758 | struct xfs_fsmap *low_key, | |
759 | struct xfs_fsmap *high_key) | |
760 | { | |
761 | if (low_key->fmr_device > high_key->fmr_device) | |
762 | return false; | |
763 | if (low_key->fmr_device < high_key->fmr_device) | |
764 | return true; | |
765 | ||
766 | if (low_key->fmr_physical > high_key->fmr_physical) | |
767 | return false; | |
768 | if (low_key->fmr_physical < high_key->fmr_physical) | |
769 | return true; | |
770 | ||
771 | if (low_key->fmr_owner > high_key->fmr_owner) | |
772 | return false; | |
773 | if (low_key->fmr_owner < high_key->fmr_owner) | |
774 | return true; | |
775 | ||
776 | if (low_key->fmr_offset > high_key->fmr_offset) | |
777 | return false; | |
778 | if (low_key->fmr_offset < high_key->fmr_offset) | |
779 | return true; | |
780 | ||
781 | return false; | |
782 | } | |
783 | ||
bb9c2e54 DC |
784 | /* |
785 | * There are only two devices if we didn't configure RT devices at build time. | |
786 | */ | |
787 | #ifdef CONFIG_XFS_RT | |
4c934c7d | 788 | #define XFS_GETFSMAP_DEVS 3 |
bb9c2e54 DC |
789 | #else |
790 | #define XFS_GETFSMAP_DEVS 2 | |
791 | #endif /* CONFIG_XFS_RT */ | |
792 | ||
e89c0413 DW |
793 | /* |
794 | * Get filesystem's extents as described in head, and format for | |
795 | * output. Calls formatter to fill the user's buffer until all | |
796 | * extents are mapped, until the passed-in head->fmh_count slots have | |
797 | * been filled, or until the formatter short-circuits the loop, if it | |
798 | * is tracking filled-in extents on its own. | |
799 | * | |
800 | * Key to Confusion | |
801 | * ---------------- | |
802 | * There are multiple levels of keys and counters at work here: | |
803 | * xfs_fsmap_head.fmh_keys -- low and high fsmap keys passed in; | |
804 | * these reflect fs-wide sector addrs. | |
805 | * dkeys -- fmh_keys used to query each device; | |
806 | * these are fmh_keys but w/ the low key | |
807 | * bumped up by fmr_length. | |
808 | * xfs_getfsmap_info.next_daddr -- next disk addr we expect to see; this | |
809 | * is how we detect gaps in the fsmap | |
810 | records and report them. | |
811 | * xfs_getfsmap_info.low/high -- per-AG low/high keys computed from | |
812 | * dkeys; used to query the metadata. | |
813 | */ | |
814 | int | |
815 | xfs_getfsmap( | |
816 | struct xfs_mount *mp, | |
817 | struct xfs_fsmap_head *head, | |
818 | xfs_fsmap_format_t formatter, | |
819 | void *arg) | |
820 | { | |
821 | struct xfs_trans *tp = NULL; | |
822 | struct xfs_fsmap dkeys[2]; /* per-dev keys */ | |
823 | struct xfs_getfsmap_dev handlers[XFS_GETFSMAP_DEVS]; | |
fad5656b | 824 | struct xfs_getfsmap_info info = { NULL }; |
ea9a46e1 | 825 | bool use_rmap; |
e89c0413 DW |
826 | int i; |
827 | int error = 0; | |
828 | ||
e89c0413 DW |
829 | if (head->fmh_iflags & ~FMH_IF_VALID) |
830 | return -EINVAL; | |
831 | if (!xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[0]) || | |
832 | !xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[1])) | |
833 | return -EINVAL; | |
834 | ||
ea9a46e1 DW |
835 | use_rmap = capable(CAP_SYS_ADMIN) && |
836 | xfs_sb_version_hasrmapbt(&mp->m_sb); | |
e89c0413 DW |
837 | head->fmh_entries = 0; |
838 | ||
839 | /* Set up our device handlers. */ | |
840 | memset(handlers, 0, sizeof(handlers)); | |
841 | handlers[0].dev = new_encode_dev(mp->m_ddev_targp->bt_dev); | |
ea9a46e1 | 842 | if (use_rmap) |
a1cae728 DW |
843 | handlers[0].fn = xfs_getfsmap_datadev_rmapbt; |
844 | else | |
845 | handlers[0].fn = xfs_getfsmap_datadev_bnobt; | |
e89c0413 DW |
846 | if (mp->m_logdev_targp != mp->m_ddev_targp) { |
847 | handlers[1].dev = new_encode_dev(mp->m_logdev_targp->bt_dev); | |
848 | handlers[1].fn = xfs_getfsmap_logdev; | |
849 | } | |
bb9c2e54 | 850 | #ifdef CONFIG_XFS_RT |
4c934c7d DW |
851 | if (mp->m_rtdev_targp) { |
852 | handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev); | |
853 | handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap; | |
854 | } | |
bb9c2e54 | 855 | #endif /* CONFIG_XFS_RT */ |
e89c0413 DW |
856 | |
857 | xfs_sort(handlers, XFS_GETFSMAP_DEVS, sizeof(struct xfs_getfsmap_dev), | |
858 | xfs_getfsmap_dev_compare); | |
859 | ||
860 | /* | |
861 | * To continue where we left off, we allow userspace to use the | |
862 | * last mapping from a previous call as the low key of the next. | |
863 | * This is identified by a non-zero length in the low key. We | |
864 | * have to increment the low key in this scenario to ensure we | |
865 | * don't return the same mapping again, and instead return the | |
866 | * very next mapping. | |
867 | * | |
868 | * If the low key mapping refers to file data, the same physical | |
869 | * blocks could be mapped to several other files/offsets. | |
870 | * According to rmapbt record ordering, the minimal next | |
871 | * possible record for the block range is the next starting | |
872 | * offset in the same inode. Therefore, bump the file offset to | |
873 | * continue the search appropriately. For all other low key | |
874 | * mapping types (attr blocks, metadata), bump the physical | |
875 | * offset as there can be no other mapping for the same physical | |
876 | * block range. | |
877 | */ | |
878 | dkeys[0] = head->fmh_keys[0]; | |
879 | if (dkeys[0].fmr_flags & (FMR_OF_SPECIAL_OWNER | FMR_OF_EXTENT_MAP)) { | |
880 | dkeys[0].fmr_physical += dkeys[0].fmr_length; | |
881 | dkeys[0].fmr_owner = 0; | |
882 | if (dkeys[0].fmr_offset) | |
883 | return -EINVAL; | |
884 | } else | |
885 | dkeys[0].fmr_offset += dkeys[0].fmr_length; | |
886 | dkeys[0].fmr_length = 0; | |
887 | memset(&dkeys[1], 0xFF, sizeof(struct xfs_fsmap)); | |
888 | ||
889 | if (!xfs_getfsmap_check_keys(dkeys, &head->fmh_keys[1])) | |
890 | return -EINVAL; | |
891 | ||
892 | info.next_daddr = head->fmh_keys[0].fmr_physical + | |
893 | head->fmh_keys[0].fmr_length; | |
894 | info.formatter = formatter; | |
895 | info.format_arg = arg; | |
896 | info.head = head; | |
897 | ||
898 | /* For each device we support... */ | |
899 | for (i = 0; i < XFS_GETFSMAP_DEVS; i++) { | |
900 | /* Is this device within the range the user asked for? */ | |
901 | if (!handlers[i].fn) | |
902 | continue; | |
903 | if (head->fmh_keys[0].fmr_device > handlers[i].dev) | |
904 | continue; | |
905 | if (head->fmh_keys[1].fmr_device < handlers[i].dev) | |
906 | break; | |
907 | ||
908 | /* | |
909 | * If this device number matches the high key, we have | |
910 | * to pass the high key to the handler to limit the | |
911 | * query results. If the device number exceeds the | |
912 | * low key, zero out the low key so that we get | |
913 | * everything from the beginning. | |
914 | */ | |
915 | if (handlers[i].dev == head->fmh_keys[1].fmr_device) | |
916 | dkeys[1] = head->fmh_keys[1]; | |
917 | if (handlers[i].dev > head->fmh_keys[0].fmr_device) | |
918 | memset(&dkeys[0], 0, sizeof(struct xfs_fsmap)); | |
919 | ||
920 | error = xfs_trans_alloc_empty(mp, &tp); | |
921 | if (error) | |
922 | break; | |
923 | ||
924 | info.dev = handlers[i].dev; | |
925 | info.last = false; | |
926 | info.agno = NULLAGNUMBER; | |
927 | error = handlers[i].fn(tp, dkeys, &info); | |
928 | if (error) | |
929 | break; | |
930 | xfs_trans_cancel(tp); | |
931 | tp = NULL; | |
932 | info.next_daddr = 0; | |
933 | } | |
934 | ||
935 | if (tp) | |
936 | xfs_trans_cancel(tp); | |
937 | head->fmh_oflags = FMH_OF_DEV_T; | |
938 | return error; | |
939 | } |