Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 : * All Rights Reserved.
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_mount.h"
13 : #include "xfs_inode.h"
14 : #include "xfs_trans.h"
15 : #include "xfs_trans_priv.h"
16 : #include "xfs_inode_item.h"
17 : #include "xfs_quota.h"
18 : #include "xfs_trace.h"
19 : #include "xfs_icache.h"
20 : #include "xfs_bmap_util.h"
21 : #include "xfs_dquot_item.h"
22 : #include "xfs_dquot.h"
23 : #include "xfs_reflink.h"
24 : #include "xfs_ialloc.h"
25 : #include "xfs_ag.h"
26 : #include "xfs_log_priv.h"
27 : #include "xfs_health.h"
28 :
29 : #include <linux/iversion.h>
30 :
31 : /* Radix tree tags for incore inode tree. */
32 :
33 : /* inode is to be reclaimed */
34 : #define XFS_ICI_RECLAIM_TAG 0
35 : /* Inode has speculative preallocations (posteof or cow) to clean. */
36 : #define XFS_ICI_BLOCKGC_TAG 1
37 :
38 : /*
39 : * The goal for walking incore inodes. These can correspond with incore inode
40 : * radix tree tags when convenient. Avoid existing XFS_IWALK namespace.
41 : */
42 : enum xfs_icwalk_goal {
43 : /* Goals directly associated with tagged inodes. */
44 : XFS_ICWALK_BLOCKGC = XFS_ICI_BLOCKGC_TAG,
45 : XFS_ICWALK_RECLAIM = XFS_ICI_RECLAIM_TAG,
46 : };
47 :
48 : static int xfs_icwalk(struct xfs_mount *mp,
49 : enum xfs_icwalk_goal goal, struct xfs_icwalk *icw);
50 : static int xfs_icwalk_ag(struct xfs_perag *pag,
51 : enum xfs_icwalk_goal goal, struct xfs_icwalk *icw);
52 :
53 : /*
54 : * Private inode cache walk flags for struct xfs_icwalk. Must not
55 : * coincide with XFS_ICWALK_FLAGS_VALID.
56 : */
57 :
58 : /* Stop scanning after icw_scan_limit inodes. */
59 : #define XFS_ICWALK_FLAG_SCAN_LIMIT (1U << 28)
60 :
61 : #define XFS_ICWALK_FLAG_RECLAIM_SICK (1U << 27)
62 : #define XFS_ICWALK_FLAG_UNION (1U << 26) /* union filter algorithm */
63 :
64 : #define XFS_ICWALK_PRIVATE_FLAGS (XFS_ICWALK_FLAG_SCAN_LIMIT | \
65 : XFS_ICWALK_FLAG_RECLAIM_SICK | \
66 : XFS_ICWALK_FLAG_UNION)
67 :
68 : /*
69 : * Allocate and initialise an xfs_inode.
70 : */
71 : struct xfs_inode *
72 456978107 : xfs_inode_alloc(
73 : struct xfs_mount *mp,
74 : xfs_ino_t ino)
75 : {
76 456978107 : struct xfs_inode *ip;
77 :
78 : /*
79 : * XXX: If this didn't occur in transactions, we could drop GFP_NOFAIL
80 : * and return NULL here on ENOMEM.
81 : */
82 456978107 : ip = alloc_inode_sb(mp->m_super, xfs_inode_cache, GFP_KERNEL | __GFP_NOFAIL);
83 :
84 456987254 : if (inode_init_always(mp->m_super, VFS_I(ip))) {
85 0 : kmem_cache_free(xfs_inode_cache, ip);
86 0 : return NULL;
87 : }
88 :
89 : /* VFS doesn't initialise i_mode or i_state! */
90 456981196 : VFS_I(ip)->i_mode = 0;
91 456981196 : VFS_I(ip)->i_state = 0;
92 456981196 : mapping_set_large_folios(VFS_I(ip)->i_mapping);
93 :
94 456927625 : XFS_STATS_INC(mp, vn_active);
95 456927625 : ASSERT(atomic_read(&ip->i_pincount) == 0);
96 456927625 : ASSERT(ip->i_ino == 0);
97 :
98 : /* initialise the xfs inode */
99 456927625 : ip->i_ino = ino;
100 456927625 : ip->i_mount = mp;
101 456927625 : memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
102 456927625 : ip->i_cowfp = NULL;
103 456927625 : memset(&ip->i_af, 0, sizeof(ip->i_af));
104 456927625 : ip->i_af.if_format = XFS_DINODE_FMT_EXTENTS;
105 456927625 : memset(&ip->i_df, 0, sizeof(ip->i_df));
106 456927625 : ip->i_flags = 0;
107 456927625 : ip->i_delayed_blks = 0;
108 456927625 : ip->i_diflags2 = mp->m_ino_geo.new_diflags2;
109 456927625 : ip->i_nblocks = 0;
110 456927625 : ip->i_forkoff = 0;
111 456927625 : ip->i_sick = 0;
112 456927625 : ip->i_checked = 0;
113 456927625 : INIT_WORK(&ip->i_ioend_work, xfs_end_io);
114 456927625 : INIT_LIST_HEAD(&ip->i_ioend_list);
115 456927625 : spin_lock_init(&ip->i_ioend_lock);
116 456931179 : ip->i_next_unlinked = NULLAGINO;
117 456931179 : ip->i_prev_unlinked = 0;
118 :
119 456931179 : return ip;
120 : }
121 :
122 : STATIC void
123 454542499 : xfs_inode_free_callback(
124 : struct rcu_head *head)
125 : {
126 454542499 : struct inode *inode = container_of(head, struct inode, i_rcu);
127 454542499 : struct xfs_inode *ip = XFS_I(inode);
128 :
129 454542499 : switch (VFS_I(ip)->i_mode & S_IFMT) {
130 264412820 : case S_IFREG:
131 : case S_IFDIR:
132 : case S_IFLNK:
133 264412820 : xfs_idestroy_fork(&ip->i_df);
134 264412820 : break;
135 : }
136 :
137 454686213 : xfs_ifork_zap_attr(ip);
138 :
139 455965423 : if (ip->i_cowfp) {
140 96791602 : xfs_idestroy_fork(ip->i_cowfp);
141 96774419 : kmem_cache_free(xfs_ifork_cache, ip->i_cowfp);
142 : }
143 455821798 : if (ip->i_itemp) {
144 47201795 : ASSERT(!test_bit(XFS_LI_IN_AIL,
145 : &ip->i_itemp->ili_item.li_flags));
146 47201795 : xfs_inode_item_destroy(ip);
147 47419130 : ip->i_itemp = NULL;
148 : }
149 :
150 456039133 : kmem_cache_free(xfs_inode_cache, ip);
151 455884757 : }
152 :
153 : static void
154 457013164 : __xfs_inode_free(
155 : struct xfs_inode *ip)
156 : {
157 : /* asserts to verify all state is correct here */
158 457013164 : ASSERT(atomic_read(&ip->i_pincount) == 0);
159 457013164 : ASSERT(!ip->i_itemp || list_empty(&ip->i_itemp->ili_item.li_bio_list));
160 457013164 : XFS_STATS_DEC(ip->i_mount, vn_active);
161 :
162 457013164 : call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
163 457012804 : }
164 :
165 : void
166 762918 : xfs_inode_free(
167 : struct xfs_inode *ip)
168 : {
169 1525850 : ASSERT(!xfs_iflags_test(ip, XFS_IFLUSHING));
170 :
171 : /*
172 : * Because we use RCU freeing we need to ensure the inode always
173 : * appears to be reclaimed with an invalid inode number when in the
174 : * free state. The ip->i_flags_lock provides the barrier against lookup
175 : * races.
176 : */
177 762932 : spin_lock(&ip->i_flags_lock);
178 762926 : ip->i_flags = XFS_IRECLAIM;
179 762926 : ip->i_ino = 0;
180 762926 : spin_unlock(&ip->i_flags_lock);
181 :
182 762913 : __xfs_inode_free(ip);
183 762916 : }
184 :
185 : /*
186 : * Queue background inode reclaim work if there are reclaimable inodes and there
187 : * isn't reclaim work already scheduled or in progress.
188 : */
189 : static void
190 5467287 : xfs_reclaim_work_queue(
191 : struct xfs_mount *mp)
192 : {
193 :
194 5467287 : rcu_read_lock();
195 5467289 : if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
196 5457685 : queue_delayed_work(mp->m_reclaim_workqueue, &mp->m_reclaim_work,
197 5457685 : msecs_to_jiffies(xfs_syncd_centisecs / 6 * 10));
198 : }
199 5464530 : rcu_read_unlock();
200 5465714 : }
201 :
202 : /*
203 : * Background scanning to trim preallocated space. This is queued based on the
204 : * 'speculative_prealloc_lifetime' tunable (5m by default).
205 : */
206 : static inline void
207 675001 : xfs_blockgc_queue(
208 : struct xfs_perag *pag)
209 : {
210 675001 : struct xfs_mount *mp = pag->pag_mount;
211 :
212 1350002 : if (!xfs_is_blockgc_enabled(mp))
213 : return;
214 :
215 675005 : rcu_read_lock();
216 675000 : if (radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_BLOCKGC_TAG))
217 662561 : queue_delayed_work(pag->pag_mount->m_blockgc_wq,
218 : &pag->pag_blockgc_work,
219 662561 : msecs_to_jiffies(xfs_blockgc_secs * 1000));
220 674857 : rcu_read_unlock();
221 : }
222 :
223 : /* Set a tag on both the AG incore inode tree and the AG radix tree. */
224 : static void
225 1058317936 : xfs_perag_set_inode_tag(
226 : struct xfs_perag *pag,
227 : xfs_agino_t agino,
228 : unsigned int tag)
229 : {
230 1058317936 : struct xfs_mount *mp = pag->pag_mount;
231 1058317936 : bool was_tagged;
232 :
233 1058317936 : lockdep_assert_held(&pag->pag_ici_lock);
234 :
235 1058317936 : was_tagged = radix_tree_tagged(&pag->pag_ici_root, tag);
236 1058318852 : radix_tree_tag_set(&pag->pag_ici_root, agino, tag);
237 :
238 1058249432 : if (tag == XFS_ICI_RECLAIM_TAG)
239 1055851101 : pag->pag_ici_reclaimable++;
240 :
241 1058249432 : if (was_tagged)
242 : return;
243 :
244 : /* propagate the tag up into the perag radix tree */
245 5272911 : spin_lock(&mp->m_perag_lock);
246 5274575 : radix_tree_tag_set(&mp->m_perag_tree, pag->pag_agno, tag);
247 5274575 : spin_unlock(&mp->m_perag_lock);
248 :
249 : /* start background work */
250 5273311 : switch (tag) {
251 5027872 : case XFS_ICI_RECLAIM_TAG:
252 5027872 : xfs_reclaim_work_queue(mp);
253 5027872 : break;
254 245439 : case XFS_ICI_BLOCKGC_TAG:
255 245439 : xfs_blockgc_queue(pag);
256 245439 : break;
257 : }
258 :
259 5270433 : trace_xfs_perag_set_inode_tag(pag, _RET_IP_);
260 : }
261 :
262 : /* Clear a tag on both the AG incore inode tree and the AG radix tree. */
263 : static void
264 1067688096 : xfs_perag_clear_inode_tag(
265 : struct xfs_perag *pag,
266 : xfs_agino_t agino,
267 : unsigned int tag)
268 : {
269 1067688096 : struct xfs_mount *mp = pag->pag_mount;
270 :
271 1067688096 : lockdep_assert_held(&pag->pag_ici_lock);
272 :
273 : /*
274 : * Reclaim can signal (with a null agino) that it cleared its own tag
275 : * by removing the inode from the radix tree.
276 : */
277 1067688096 : if (agino != NULLAGINO)
278 611437703 : radix_tree_tag_clear(&pag->pag_ici_root, agino, tag);
279 : else
280 456250393 : ASSERT(tag == XFS_ICI_RECLAIM_TAG);
281 :
282 1067688163 : if (tag == XFS_ICI_RECLAIM_TAG)
283 1055862134 : pag->pag_ici_reclaimable--;
284 :
285 1067688163 : if (radix_tree_tagged(&pag->pag_ici_root, tag))
286 : return;
287 :
288 : /* clear the tag from the perag radix tree */
289 9676829 : spin_lock(&mp->m_perag_lock);
290 9677162 : radix_tree_tag_clear(&mp->m_perag_tree, pag->pag_agno, tag);
291 9677162 : spin_unlock(&mp->m_perag_lock);
292 :
293 9677159 : trace_xfs_perag_clear_inode_tag(pag, _RET_IP_);
294 : }
295 :
296 : /*
297 : * When we recycle a reclaimable inode, we need to re-initialise the VFS inode
298 : * part of the structure. This is made more complex by the fact we store
299 : * information about the on-disk values in the VFS inode and so we can't just
300 : * overwrite the values unconditionally. Hence we save the parameters we
301 : * need to retain across reinitialisation, and rewrite them into the VFS inode
302 : * after reinitialisation even if it fails.
303 : */
304 : static int
305 599130751 : xfs_reinit_inode(
306 : struct xfs_mount *mp,
307 : struct inode *inode)
308 : {
309 599130751 : int error;
310 599130751 : uint32_t nlink = inode->i_nlink;
311 599130751 : uint32_t generation = inode->i_generation;
312 599130751 : uint64_t version = inode_peek_iversion(inode);
313 599130751 : umode_t mode = inode->i_mode;
314 599130751 : dev_t dev = inode->i_rdev;
315 599130751 : kuid_t uid = inode->i_uid;
316 599130751 : kgid_t gid = inode->i_gid;
317 :
318 599130751 : error = inode_init_always(mp->m_super, inode);
319 :
320 599597415 : set_nlink(inode, nlink);
321 599622608 : inode->i_generation = generation;
322 599622608 : inode_set_iversion_queried(inode, version);
323 599622608 : inode->i_mode = mode;
324 599622608 : inode->i_rdev = dev;
325 599622608 : inode->i_uid = uid;
326 599622608 : inode->i_gid = gid;
327 599622608 : mapping_set_large_folios(inode->i_mapping);
328 599595524 : return error;
329 : }
330 :
331 : /*
332 : * Carefully nudge an inode whose VFS state has been torn down back into a
333 : * usable state. Drops the i_flags_lock and the rcu read lock.
334 : */
335 : static int
336 599627487 : xfs_iget_recycle(
337 : struct xfs_perag *pag,
338 : struct xfs_inode *ip) __releases(&ip->i_flags_lock)
339 : {
340 599627487 : struct xfs_mount *mp = ip->i_mount;
341 599627487 : struct inode *inode = VFS_I(ip);
342 599627487 : int error;
343 :
344 599627487 : trace_xfs_iget_recycle(ip);
345 :
346 599629068 : if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
347 : return -EAGAIN;
348 :
349 : /*
350 : * We need to make it look like the inode is being reclaimed to prevent
351 : * the actual reclaim workers from stomping over us while we recycle
352 : * the inode. We can't clear the radix tree tag yet as it requires
353 : * pag_ici_lock to be held exclusive.
354 : */
355 599640637 : ip->i_flags |= XFS_IRECLAIM;
356 :
357 599640637 : spin_unlock(&ip->i_flags_lock);
358 599631578 : rcu_read_unlock();
359 :
360 599521518 : ASSERT(!rwsem_is_locked(&inode->i_rwsem));
361 599521518 : error = xfs_reinit_inode(mp, inode);
362 599570262 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
363 599602519 : if (error) {
364 : /*
365 : * Re-initializing the inode failed, and we are in deep
366 : * trouble. Try to re-add it to the reclaim list.
367 : */
368 0 : rcu_read_lock();
369 0 : spin_lock(&ip->i_flags_lock);
370 0 : ip->i_flags &= ~(XFS_INEW | XFS_IRECLAIM);
371 0 : ASSERT(ip->i_flags & XFS_IRECLAIMABLE);
372 0 : spin_unlock(&ip->i_flags_lock);
373 0 : rcu_read_unlock();
374 :
375 0 : trace_xfs_iget_recycle_fail(ip);
376 0 : return error;
377 : }
378 :
379 599602519 : spin_lock(&pag->pag_ici_lock);
380 599671346 : spin_lock(&ip->i_flags_lock);
381 :
382 : /*
383 : * Clear the per-lifetime state in the inode as we are now effectively
384 : * a new inode and need to return to the initial state before reuse
385 : * occurs.
386 : */
387 599673233 : ip->i_flags &= ~XFS_IRECLAIM_RESET_FLAGS;
388 599673233 : ip->i_flags |= XFS_INEW;
389 599673233 : xfs_perag_clear_inode_tag(pag, XFS_INO_TO_AGINO(mp, ip->i_ino),
390 : XFS_ICI_RECLAIM_TAG);
391 599672757 : inode->i_state = I_NEW;
392 599672757 : spin_unlock(&ip->i_flags_lock);
393 599673265 : spin_unlock(&pag->pag_ici_lock);
394 :
395 599673265 : return 0;
396 : }
397 :
398 : /*
399 : * If we are allocating a new inode, then check what was returned is
400 : * actually a free, empty inode. If we are not allocating an inode,
401 : * then check we didn't find a free inode.
402 : *
403 : * Returns:
404 : * 0 if the inode free state matches the lookup context
405 : * -ENOENT if the inode is free and we are not allocating
406 : * -EFSCORRUPTED if there is any state mismatch at all
407 : */
408 : static int
409 66054691467 : xfs_iget_check_free_state(
410 : struct xfs_inode *ip,
411 : int flags)
412 : {
413 66054691467 : if (flags & XFS_IGET_CREATE) {
414 : /* should be a free inode */
415 69432797 : if (VFS_I(ip)->i_mode != 0) {
416 0 : xfs_warn(ip->i_mount,
417 : "Corruption detected! Free inode 0x%llx not marked free! (mode 0x%x)",
418 : ip->i_ino, VFS_I(ip)->i_mode);
419 0 : xfs_agno_mark_sick(ip->i_mount,
420 0 : XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
421 : XFS_SICK_AG_INOBT);
422 0 : return -EFSCORRUPTED;
423 : }
424 :
425 69432797 : if (ip->i_nblocks != 0) {
426 0 : xfs_warn(ip->i_mount,
427 : "Corruption detected! Free inode 0x%llx has blocks allocated!",
428 : ip->i_ino);
429 0 : xfs_agno_mark_sick(ip->i_mount,
430 0 : XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
431 : XFS_SICK_AG_INOBT);
432 0 : return -EFSCORRUPTED;
433 : }
434 : return 0;
435 : }
436 :
437 : /* should be an allocated inode */
438 65985258670 : if (VFS_I(ip)->i_mode == 0)
439 2427683 : return -ENOENT;
440 :
441 : return 0;
442 : }
443 :
444 : /* Make all pending inactivation work start immediately. */
445 : static bool
446 13236338 : xfs_inodegc_queue_all(
447 : struct xfs_mount *mp)
448 : {
449 13236338 : struct xfs_inodegc *gc;
450 13236338 : int cpu;
451 13236338 : bool ret = false;
452 :
453 39684018 : for_each_online_cpu(cpu) {
454 26446605 : gc = per_cpu_ptr(mp->m_inodegc, cpu);
455 26446605 : if (!llist_empty(&gc->list)) {
456 743119 : mod_delayed_work_on(cpu, mp->m_inodegc_wq, &gc->work, 0);
457 743119 : ret = true;
458 : }
459 : }
460 :
461 13220540 : return ret;
462 : }
463 :
464 : /* Wait for all queued work and collect errors */
465 : static int
466 4131331 : xfs_inodegc_wait_all(
467 : struct xfs_mount *mp)
468 : {
469 4131331 : int cpu;
470 4131331 : int error = 0;
471 :
472 4131331 : flush_workqueue(mp->m_inodegc_wq);
473 16528671 : for_each_online_cpu(cpu) {
474 8264600 : struct xfs_inodegc *gc;
475 :
476 8264600 : gc = per_cpu_ptr(mp->m_inodegc, cpu);
477 8264600 : if (gc->error && !error)
478 1725 : error = gc->error;
479 8264600 : gc->error = 0;
480 : }
481 :
482 4132778 : return error;
483 : }
484 :
485 : /*
486 : * Check the validity of the inode we just found it the cache
487 : */
488 : static int
489 65396173112 : xfs_iget_cache_hit(
490 : struct xfs_perag *pag,
491 : struct xfs_inode *ip,
492 : xfs_ino_t ino,
493 : int flags,
494 : int lock_flags) __releases(RCU)
495 : {
496 65396173112 : struct inode *inode = VFS_I(ip);
497 65396173112 : struct xfs_mount *mp = ip->i_mount;
498 65396173112 : int error;
499 :
500 : /*
501 : * check for re-use of an inode within an RCU grace period due to the
502 : * radix tree nodes not being updated yet. We monitor for this by
503 : * setting the inode number to zero before freeing the inode structure.
504 : * If the inode has been reallocated and set up, then the inode number
505 : * will not match, so check for that, too.
506 : */
507 65396173112 : spin_lock(&ip->i_flags_lock);
508 65583566023 : if (ip->i_ino != ino)
509 396 : goto out_skip;
510 :
511 : /*
512 : * If we are racing with another cache hit that is currently
513 : * instantiating this inode or currently recycling it out of
514 : * reclaimable state, wait for the initialisation to complete
515 : * before continuing.
516 : *
517 : * If we're racing with the inactivation worker we also want to wait.
518 : * If we're creating a new file, it's possible that the worker
519 : * previously marked the inode as free on disk but hasn't finished
520 : * updating the incore state yet. The AGI buffer will be dirty and
521 : * locked to the icreate transaction, so a synchronous push of the
522 : * inodegc workers would result in deadlock. For a regular iget, the
523 : * worker is running already, so we might as well wait.
524 : *
525 : * XXX(hch): eventually we should do something equivalent to
526 : * wait_on_inode to wait for these flags to be cleared
527 : * instead of polling for it.
528 : */
529 65583565627 : if (ip->i_flags & (XFS_INEW | XFS_IRECLAIM | XFS_INACTIVATING))
530 218645 : goto out_skip;
531 :
532 65583346982 : if (ip->i_flags & XFS_NEED_INACTIVE) {
533 : /* Unlinked inodes cannot be re-grabbed. */
534 1376967 : if (VFS_I(ip)->i_nlink == 0) {
535 1336190 : error = -ENOENT;
536 1336190 : goto out_error;
537 : }
538 40777 : goto out_inodegc_flush;
539 : }
540 :
541 : /*
542 : * Check the inode free state is valid. This also detects lookup
543 : * racing with unlinks.
544 : */
545 65581970015 : error = xfs_iget_check_free_state(ip, flags);
546 65608706459 : if (error)
547 2427686 : goto out_error;
548 :
549 : /* Skip inodes that have no vfs state. */
550 65606278773 : if ((flags & XFS_IGET_INCORE) &&
551 0 : (ip->i_flags & XFS_IRECLAIMABLE))
552 0 : goto out_skip;
553 :
554 : /* The inode fits the selection criteria; process it. */
555 65606278773 : if (ip->i_flags & XFS_IRECLAIMABLE) {
556 : /* Drops i_flags_lock and RCU read lock. */
557 599626795 : error = xfs_iget_recycle(pag, ip);
558 599652767 : if (error == -EAGAIN)
559 3 : goto out_skip;
560 599652764 : if (error)
561 : return error;
562 : } else {
563 : /* If the VFS inode is being torn down, pause and try again. */
564 65006651978 : if (!igrab(inode))
565 122312 : goto out_skip;
566 :
567 : /* We've got a live one. */
568 64995263538 : spin_unlock(&ip->i_flags_lock);
569 64698330933 : rcu_read_unlock();
570 64903699596 : trace_xfs_iget_hit(ip);
571 : }
572 :
573 65288069763 : if (lock_flags != 0)
574 59978440962 : xfs_ilock(ip, lock_flags);
575 :
576 65347027710 : if (!(flags & XFS_IGET_INCORE))
577 65481075381 : xfs_iflags_clear(ip, XFS_ISTALE);
578 65545969695 : XFS_STATS_INC(mp, xs_ig_found);
579 :
580 65545969695 : return 0;
581 :
582 341356 : out_skip:
583 341356 : trace_xfs_iget_skip(ip);
584 341356 : XFS_STATS_INC(mp, xs_ig_frecycle);
585 341356 : error = -EAGAIN;
586 4105232 : out_error:
587 4105232 : spin_unlock(&ip->i_flags_lock);
588 4105192 : rcu_read_unlock();
589 4105192 : return error;
590 :
591 : out_inodegc_flush:
592 40777 : spin_unlock(&ip->i_flags_lock);
593 40775 : rcu_read_unlock();
594 : /*
595 : * Do not wait for the workers, because the caller could hold an AGI
596 : * buffer lock. We're just going to sleep in a loop anyway.
597 : */
598 81506 : if (xfs_is_inodegc_enabled(mp))
599 40754 : xfs_inodegc_queue_all(mp);
600 : return -EAGAIN;
601 : }
602 :
603 : static int
604 456972178 : xfs_iget_cache_miss(
605 : struct xfs_mount *mp,
606 : struct xfs_perag *pag,
607 : xfs_trans_t *tp,
608 : xfs_ino_t ino,
609 : struct xfs_inode **ipp,
610 : int flags,
611 : int lock_flags)
612 : {
613 456972178 : struct xfs_inode *ip;
614 456972178 : int error;
615 456972178 : xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
616 456972178 : int iflags;
617 :
618 456972178 : ip = xfs_inode_alloc(mp, ino);
619 456954796 : if (!ip)
620 : return -ENOMEM;
621 :
622 456954796 : error = xfs_imap(pag, tp, ip->i_ino, &ip->i_imap, flags);
623 456993442 : if (error)
624 85705 : goto out_destroy;
625 :
626 : /*
627 : * For version 5 superblocks, if we are initialising a new inode and we
628 : * are not utilising the XFS_FEAT_IKEEP inode cluster mode, we can
629 : * simply build the new inode core with a random generation number.
630 : *
631 : * For version 4 (and older) superblocks, log recovery is dependent on
632 : * the i_flushiter field being initialised from the current on-disk
633 : * value and hence we must also read the inode off disk even when
634 : * initializing new inodes.
635 : */
636 456907737 : if (xfs_has_v3inodes(mp) &&
637 456907319 : (flags & XFS_IGET_CREATE) && !xfs_has_ikeep(mp)) {
638 26415661 : VFS_I(ip)->i_generation = get_random_u32();
639 : } else {
640 430492076 : struct xfs_buf *bp;
641 :
642 430492076 : error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp);
643 430487443 : if (error)
644 4228 : goto out_destroy;
645 :
646 430503440 : error = xfs_inode_from_disk(ip,
647 430483417 : xfs_buf_offset(bp, ip->i_imap.im_boffset));
648 430488561 : if (!error)
649 430488359 : xfs_buf_set_ref(bp, XFS_INO_REF);
650 : else
651 202 : xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
652 430483244 : xfs_trans_brelse(tp, bp);
653 :
654 430500849 : if (error)
655 202 : goto out_destroy;
656 : }
657 :
658 456912129 : trace_xfs_iget_miss(ip);
659 :
660 : /*
661 : * Check the inode free state is valid. This also detects lookup
662 : * racing with unlinks.
663 : */
664 456915996 : error = xfs_iget_check_free_state(ip, flags);
665 456910661 : if (error)
666 0 : goto out_destroy;
667 :
668 : /*
669 : * Preload the radix tree so we can insert safely under the
670 : * write spinlock. Note that we cannot sleep inside the preload
671 : * region. Since we can be called from transaction context, don't
672 : * recurse into the file system.
673 : */
674 456910661 : if (radix_tree_preload(GFP_NOFS)) {
675 0 : error = -EAGAIN;
676 0 : goto out_destroy;
677 : }
678 :
679 : /*
680 : * Because the inode hasn't been added to the radix-tree yet it can't
681 : * be found by another thread, so we can do the non-sleeping lock here.
682 : */
683 456913249 : if (lock_flags) {
684 446999265 : if (!xfs_ilock_nowait(ip, lock_flags))
685 0 : BUG();
686 : }
687 :
688 : /*
689 : * These values must be set before inserting the inode into the radix
690 : * tree as the moment it is inserted a concurrent lookup (allowed by the
691 : * RCU locking mechanism) can find it and that lookup must see that this
692 : * is an inode currently under construction (i.e. that XFS_INEW is set).
693 : * The ip->i_flags_lock that protects the XFS_INEW flag forms the
694 : * memory barrier that ensures this detection works correctly at lookup
695 : * time.
696 : */
697 456917312 : iflags = XFS_INEW;
698 456917312 : if (flags & XFS_IGET_DONTCACHE)
699 420618433 : d_mark_dontcache(VFS_I(ip));
700 456918131 : ip->i_udquot = NULL;
701 456918131 : ip->i_gdquot = NULL;
702 456918131 : ip->i_pdquot = NULL;
703 456918131 : xfs_iflags_set(ip, iflags);
704 :
705 : /* insert the new inode */
706 456919593 : spin_lock(&pag->pag_ici_lock);
707 456920649 : error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
708 456916883 : if (unlikely(error)) {
709 672999 : WARN_ON(error != -EEXIST);
710 672999 : XFS_STATS_INC(mp, xs_ig_dup);
711 672999 : error = -EAGAIN;
712 672999 : goto out_preload_end;
713 : }
714 456243884 : spin_unlock(&pag->pag_ici_lock);
715 456244439 : radix_tree_preload_end();
716 :
717 456243573 : *ipp = ip;
718 456243573 : return 0;
719 :
720 : out_preload_end:
721 672999 : spin_unlock(&pag->pag_ici_lock);
722 672999 : radix_tree_preload_end();
723 672998 : if (lock_flags)
724 672479 : xfs_iunlock(ip, lock_flags);
725 519 : out_destroy:
726 762932 : __destroy_inode(VFS_I(ip));
727 762925 : xfs_inode_free(ip);
728 762925 : return error;
729 : }
730 :
731 : /*
732 : * Look up an inode by number in the given file system. The inode is looked up
733 : * in the cache held in each AG. If the inode is found in the cache, initialise
734 : * the vfs inode if necessary.
735 : *
736 : * If it is not in core, read it in from the file system's device, add it to the
737 : * cache and initialise the vfs inode.
738 : *
739 : * The inode is locked according to the value of the lock_flags parameter.
740 : * Inode lookup is only done during metadata operations and not as part of the
741 : * data IO path. Hence we only allow locking of the XFS_ILOCK during lookup.
742 : */
743 : int
744 65755828519 : xfs_iget(
745 : struct xfs_mount *mp,
746 : struct xfs_trans *tp,
747 : xfs_ino_t ino,
748 : uint flags,
749 : uint lock_flags,
750 : struct xfs_inode **ipp)
751 : {
752 65755828519 : struct xfs_inode *ip;
753 65755828519 : struct xfs_perag *pag;
754 65755828519 : xfs_agino_t agino;
755 65755828519 : int error;
756 :
757 65755828519 : ASSERT((lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) == 0);
758 :
759 : /* reject inode numbers outside existing AGs */
760 65755828519 : if (!ino || XFS_INO_TO_AGNO(mp, ino) >= mp->m_sb.sb_agcount)
761 : return -EINVAL;
762 :
763 65755280367 : XFS_STATS_INC(mp, xs_ig_attempts);
764 :
765 : /* get the perag structure and ensure that it's inode capable */
766 65755280367 : pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino));
767 65995770949 : agino = XFS_INO_TO_AGINO(mp, ino);
768 :
769 65996812512 : again:
770 65996812512 : error = 0;
771 65996812512 : rcu_read_lock();
772 66037934928 : ip = radix_tree_lookup(&pag->pag_ici_root, agino);
773 :
774 65836294296 : if (ip) {
775 65379307920 : error = xfs_iget_cache_hit(pag, ip, ino, flags, lock_flags);
776 65403096600 : if (error)
777 4145968 : goto out_error_or_again;
778 : } else {
779 456986376 : rcu_read_unlock();
780 456991982 : if (flags & XFS_IGET_INCORE) {
781 0 : error = -ENODATA;
782 0 : goto out_error_or_again;
783 : }
784 456991982 : XFS_STATS_INC(mp, xs_ig_missed);
785 :
786 456991982 : error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip,
787 : flags, lock_flags);
788 456976393 : if (error)
789 762913 : goto out_error_or_again;
790 : }
791 65855164112 : xfs_perag_put(pag);
792 :
793 66139776937 : *ipp = ip;
794 :
795 : /*
796 : * If we have a real type for an on-disk inode, we can setup the inode
797 : * now. If it's a new inode being created, xfs_init_new_inode will
798 : * handle it.
799 : */
800 >13228*10^7 : if (xfs_iflags_test(ip, XFS_INEW) && VFS_I(ip)->i_mode != 0)
801 985160945 : xfs_setup_existing_inode(ip);
802 : return 0;
803 :
804 4908881 : out_error_or_again:
805 4908881 : if (!(flags & (XFS_IGET_INCORE | XFS_IGET_NORETRY)) &&
806 : error == -EAGAIN) {
807 1041832 : delay(1);
808 1041563 : goto again;
809 : }
810 3867049 : xfs_perag_put(pag);
811 3867049 : return error;
812 : }
813 :
814 : /*
815 : * Grab the inode for reclaim exclusively.
816 : *
817 : * We have found this inode via a lookup under RCU, so the inode may have
818 : * already been freed, or it may be in the process of being recycled by
819 : * xfs_iget(). In both cases, the inode will have XFS_IRECLAIM set. If the inode
820 : * has been fully recycled by the time we get the i_flags_lock, XFS_IRECLAIMABLE
821 : * will not be set. Hence we need to check for both these flag conditions to
822 : * avoid inodes that are no longer reclaim candidates.
823 : *
824 : * Note: checking for other state flags here, under the i_flags_lock or not, is
825 : * racy and should be avoided. Those races should be resolved only after we have
826 : * ensured that we are able to reclaim this inode and the world can see that we
827 : * are going to reclaim it.
828 : *
829 : * Return true if we grabbed it, false otherwise.
830 : */
831 : static bool
832 474845130 : xfs_reclaim_igrab(
833 : struct xfs_inode *ip,
834 : struct xfs_icwalk *icw)
835 : {
836 474845130 : ASSERT(rcu_read_lock_held());
837 :
838 474845130 : spin_lock(&ip->i_flags_lock);
839 474851181 : if (!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) ||
840 : __xfs_iflags_test(ip, XFS_IRECLAIM)) {
841 : /* not a reclaim candidate. */
842 60922 : spin_unlock(&ip->i_flags_lock);
843 60922 : return false;
844 : }
845 :
846 : /* Don't reclaim a sick inode unless the caller asked for it. */
847 474790259 : if (ip->i_sick &&
848 32 : (!icw || !(icw->icw_flags & XFS_ICWALK_FLAG_RECLAIM_SICK))) {
849 0 : spin_unlock(&ip->i_flags_lock);
850 0 : return false;
851 : }
852 :
853 474790259 : __xfs_iflags_set(ip, XFS_IRECLAIM);
854 474790259 : spin_unlock(&ip->i_flags_lock);
855 474790259 : return true;
856 : }
857 :
858 : /*
859 : * Inode reclaim is non-blocking, so the default action if progress cannot be
860 : * made is to "requeue" the inode for reclaim by unlocking it and clearing the
861 : * XFS_IRECLAIM flag. If we are in a shutdown state, we don't care about
862 : * blocking anymore and hence we can wait for the inode to be able to reclaim
863 : * it.
864 : *
865 : * We do no IO here - if callers require inodes to be cleaned they must push the
866 : * AIL first to trigger writeback of dirty inodes. This enables writeback to be
867 : * done in the background in a non-blocking manner, and enables memory reclaim
868 : * to make progress without blocking.
869 : */
870 : static void
871 474794080 : xfs_reclaim_inode(
872 : struct xfs_inode *ip,
873 : struct xfs_perag *pag)
874 : {
875 474794080 : xfs_ino_t ino = ip->i_ino; /* for radix_tree_delete */
876 :
877 474794080 : if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
878 3 : goto out;
879 474794977 : if (xfs_iflags_test_and_set(ip, XFS_IFLUSHING))
880 10901585 : goto out_iunlock;
881 :
882 : /*
883 : * Check for log shutdown because aborting the inode can move the log
884 : * tail and corrupt in memory state. This is fine if the log is shut
885 : * down, but if the log is still active and only the mount is shut down
886 : * then the in-memory log tail movement caused by the abort can be
887 : * incorrectly propagated to disk.
888 : */
889 927784582 : if (xlog_is_shutdown(ip->i_mount->m_log)) {
890 293787254 : xfs_iunpin_wait(ip);
891 293787254 : xfs_iflush_shutdown_abort(ip);
892 293787254 : goto reclaim;
893 : }
894 170105037 : if (xfs_ipincount(ip))
895 1379044 : goto out_clear_flush;
896 168725993 : if (!xfs_inode_clean(ip))
897 6266549 : goto out_clear_flush;
898 :
899 162459444 : xfs_iflags_clear(ip, XFS_IFLUSHING);
900 456249308 : reclaim:
901 456249308 : trace_xfs_inode_reclaiming(ip);
902 :
903 : /*
904 : * Because we use RCU freeing we need to ensure the inode always appears
905 : * to be reclaimed with an invalid inode number when in the free state.
906 : * We do this as early as possible under the ILOCK so that
907 : * xfs_iflush_cluster() and xfs_ifree_cluster() can be guaranteed to
908 : * detect races with us here. By doing this, we guarantee that once
909 : * xfs_iflush_cluster() or xfs_ifree_cluster() has locked XFS_ILOCK that
910 : * it will see either a valid inode that will serialise correctly, or it
911 : * will see an invalid inode that it can skip.
912 : */
913 456249335 : spin_lock(&ip->i_flags_lock);
914 456248487 : ip->i_flags = XFS_IRECLAIM;
915 456248487 : ip->i_ino = 0;
916 456248487 : ip->i_sick = 0;
917 456248487 : ip->i_checked = 0;
918 456248487 : spin_unlock(&ip->i_flags_lock);
919 :
920 456248322 : ASSERT(!ip->i_itemp || ip->i_itemp->ili_item.li_buf == NULL);
921 456248322 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
922 :
923 456248082 : XFS_STATS_INC(ip->i_mount, xs_ig_reclaims);
924 : /*
925 : * Remove the inode from the per-AG radix tree.
926 : *
927 : * Because radix_tree_delete won't complain even if the item was never
928 : * added to the tree assert that it's been there before to catch
929 : * problems with the inode life time early on.
930 : */
931 456248082 : spin_lock(&pag->pag_ici_lock);
932 912500266 : if (!xfs_is_shutdown(pag->pag_mount)) {
933 : /* had better not be on any unlinked list! */
934 162462855 : ASSERT(!xfs_inode_on_unlinked_list(ip));
935 162462855 : if (xfs_inode_on_unlinked_list(ip))
936 0 : xfs_emerg(pag->pag_mount, "IUNLINK ino 0x%llx nlink %u mode 0o%o prevun 0x%x nextun 0x%x", ino, VFS_I(ip)->i_nlink, VFS_I(ip)->i_mode, ip->i_prev_unlinked, ip->i_next_unlinked);
937 : }
938 456250696 : if (!radix_tree_delete(&pag->pag_ici_root,
939 456250133 : XFS_INO_TO_AGINO(ip->i_mount, ino)))
940 0 : ASSERT(0);
941 456250696 : xfs_perag_clear_inode_tag(pag, NULLAGINO, XFS_ICI_RECLAIM_TAG);
942 456250389 : spin_unlock(&pag->pag_ici_lock);
943 :
944 : /*
945 : * Here we do an (almost) spurious inode lock in order to coordinate
946 : * with inode cache radix tree lookups. This is because the lookup
947 : * can reference the inodes in the cache without taking references.
948 : *
949 : * We make that OK here by ensuring that we wait until the inode is
950 : * unlocked after the lookup before we go ahead and free it.
951 : */
952 456250516 : xfs_ilock(ip, XFS_ILOCK_EXCL);
953 456250336 : ASSERT(!ip->i_udquot && !ip->i_gdquot && !ip->i_pdquot);
954 456250336 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
955 503763978 : ASSERT(xfs_inode_clean(ip));
956 :
957 456250367 : __xfs_inode_free(ip);
958 456250367 : return;
959 :
960 7645593 : out_clear_flush:
961 7645593 : xfs_iflags_clear(ip, XFS_IFLUSHING);
962 18547184 : out_iunlock:
963 18547184 : xfs_iunlock(ip, XFS_ILOCK_EXCL);
964 18547145 : out:
965 18547145 : xfs_iflags_clear(ip, XFS_IRECLAIM);
966 : }
967 :
968 : /* Reclaim sick inodes if we're unmounting or the fs went down. */
969 : static inline bool
970 433382 : xfs_want_reclaim_sick(
971 : struct xfs_mount *mp)
972 : {
973 1276036 : return xfs_is_unmounting(mp) || xfs_has_norecovery(mp) ||
974 : xfs_is_shutdown(mp);
975 : }
976 :
977 : void
978 24110 : xfs_reclaim_inodes(
979 : struct xfs_mount *mp)
980 : {
981 24110 : struct xfs_icwalk icw = {
982 : .icw_flags = 0,
983 : };
984 :
985 24110 : if (xfs_want_reclaim_sick(mp))
986 24110 : icw.icw_flags |= XFS_ICWALK_FLAG_RECLAIM_SICK;
987 :
988 150657 : while (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
989 126547 : xfs_ail_push_all_sync(mp->m_ail);
990 126547 : xfs_icwalk(mp, XFS_ICWALK_RECLAIM, &icw);
991 : }
992 24110 : }
993 :
994 : /*
995 : * The shrinker infrastructure determines how many inodes we should scan for
996 : * reclaim. We want as many clean inodes ready to reclaim as possible, so we
997 : * push the AIL here. We also want to proactively free up memory if we can to
998 : * minimise the amount of work memory reclaim has to do so we kick the
999 : * background reclaim if it isn't already scheduled.
1000 : */
1001 : long
1002 409272 : xfs_reclaim_inodes_nr(
1003 : struct xfs_mount *mp,
1004 : unsigned long nr_to_scan)
1005 : {
1006 409272 : struct xfs_icwalk icw = {
1007 : .icw_flags = XFS_ICWALK_FLAG_SCAN_LIMIT,
1008 409272 : .icw_scan_limit = min_t(unsigned long, LONG_MAX, nr_to_scan),
1009 : };
1010 :
1011 409272 : if (xfs_want_reclaim_sick(mp))
1012 0 : icw.icw_flags |= XFS_ICWALK_FLAG_RECLAIM_SICK;
1013 :
1014 : /* kick background reclaimer and push the AIL */
1015 409272 : xfs_reclaim_work_queue(mp);
1016 409272 : xfs_ail_push_all(mp->m_ail);
1017 :
1018 409272 : xfs_icwalk(mp, XFS_ICWALK_RECLAIM, &icw);
1019 409272 : return 0;
1020 : }
1021 :
1022 : /*
1023 : * Return the number of reclaimable inodes in the filesystem for
1024 : * the shrinker to determine how much to reclaim.
1025 : */
1026 : long
1027 792829 : xfs_reclaim_inodes_count(
1028 : struct xfs_mount *mp)
1029 : {
1030 792829 : struct xfs_perag *pag;
1031 792829 : xfs_agnumber_t ag = 0;
1032 792829 : long reclaimable = 0;
1033 :
1034 2707177 : while ((pag = xfs_perag_get_tag(mp, ag, XFS_ICI_RECLAIM_TAG))) {
1035 1914330 : ag = pag->pag_agno + 1;
1036 1914330 : reclaimable += pag->pag_ici_reclaimable;
1037 1914330 : xfs_perag_put(pag);
1038 : }
1039 792833 : return reclaimable;
1040 : }
1041 :
1042 : STATIC bool
1043 568626 : xfs_icwalk_match_id(
1044 : struct xfs_inode *ip,
1045 : struct xfs_icwalk *icw)
1046 : {
1047 568626 : if ((icw->icw_flags & XFS_ICWALK_FLAG_UID) &&
1048 : !uid_eq(VFS_I(ip)->i_uid, icw->icw_uid))
1049 : return false;
1050 :
1051 568626 : if ((icw->icw_flags & XFS_ICWALK_FLAG_GID) &&
1052 : !gid_eq(VFS_I(ip)->i_gid, icw->icw_gid))
1053 : return false;
1054 :
1055 568626 : if ((icw->icw_flags & XFS_ICWALK_FLAG_PRID) &&
1056 0 : ip->i_projid != icw->icw_prid)
1057 0 : return false;
1058 :
1059 : return true;
1060 : }
1061 :
1062 : /*
1063 : * A union-based inode filtering algorithm. Process the inode if any of the
1064 : * criteria match. This is for global/internal scans only.
1065 : */
1066 : STATIC bool
1067 1170 : xfs_icwalk_match_id_union(
1068 : struct xfs_inode *ip,
1069 : struct xfs_icwalk *icw)
1070 : {
1071 1170 : if ((icw->icw_flags & XFS_ICWALK_FLAG_UID) &&
1072 : uid_eq(VFS_I(ip)->i_uid, icw->icw_uid))
1073 : return true;
1074 :
1075 414 : if ((icw->icw_flags & XFS_ICWALK_FLAG_GID) &&
1076 : gid_eq(VFS_I(ip)->i_gid, icw->icw_gid))
1077 : return true;
1078 :
1079 0 : if ((icw->icw_flags & XFS_ICWALK_FLAG_PRID) &&
1080 0 : ip->i_projid == icw->icw_prid)
1081 0 : return true;
1082 :
1083 : return false;
1084 : }
1085 :
1086 : /*
1087 : * Is this inode @ip eligible for eof/cow block reclamation, given some
1088 : * filtering parameters @icw? The inode is eligible if @icw is null or
1089 : * if the predicate functions match.
1090 : */
1091 : static bool
1092 1083609 : xfs_icwalk_match(
1093 : struct xfs_inode *ip,
1094 : struct xfs_icwalk *icw)
1095 : {
1096 1083609 : bool match;
1097 :
1098 1083609 : if (!icw)
1099 : return true;
1100 :
1101 569961 : if (icw->icw_flags & XFS_ICWALK_FLAG_UNION)
1102 1170 : match = xfs_icwalk_match_id_union(ip, icw);
1103 : else
1104 568791 : match = xfs_icwalk_match_id(ip, icw);
1105 569961 : if (!match)
1106 : return false;
1107 :
1108 : /* skip the inode if the file size is too small */
1109 569974 : if ((icw->icw_flags & XFS_ICWALK_FLAG_MINFILESIZE) &&
1110 0 : XFS_ISIZE(ip) < icw->icw_min_file_size)
1111 0 : return false;
1112 :
1113 : return true;
1114 : }
1115 :
1116 : /*
1117 : * This is a fast pass over the inode cache to try to get reclaim moving on as
1118 : * many inodes as possible in a short period of time. It kicks itself every few
1119 : * seconds, as well as being kicked by the inode cache shrinker when memory
1120 : * goes low.
1121 : */
1122 : void
1123 28899 : xfs_reclaim_worker(
1124 : struct work_struct *work)
1125 : {
1126 28899 : struct xfs_mount *mp = container_of(to_delayed_work(work),
1127 : struct xfs_mount, m_reclaim_work);
1128 :
1129 28899 : xfs_icwalk(mp, XFS_ICWALK_RECLAIM, NULL);
1130 28899 : xfs_reclaim_work_queue(mp);
1131 28899 : }
1132 :
1133 : STATIC int
1134 1519859 : xfs_inode_free_eofblocks(
1135 : struct xfs_inode *ip,
1136 : struct xfs_icwalk *icw,
1137 : unsigned int *lockflags)
1138 : {
1139 1519859 : bool wait;
1140 :
1141 1519859 : wait = icw && (icw->icw_flags & XFS_ICWALK_FLAG_SYNC);
1142 :
1143 3041368 : if (!xfs_iflags_test(ip, XFS_IEOFBLOCKS))
1144 : return 0;
1145 :
1146 : /*
1147 : * If the mapping is dirty the operation can block and wait for some
1148 : * time. Unless we are waiting, skip it.
1149 : */
1150 1511983 : if (!wait && mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
1151 : return 0;
1152 :
1153 1077950 : if (!xfs_icwalk_match(ip, icw))
1154 : return 0;
1155 :
1156 : /*
1157 : * If the caller is waiting, return -EAGAIN to keep the background
1158 : * scanner moving and revisit the inode in a subsequent pass.
1159 : */
1160 1077950 : if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
1161 557686 : if (wait)
1162 : return -EAGAIN;
1163 19017 : return 0;
1164 : }
1165 520746 : *lockflags |= XFS_IOLOCK_EXCL;
1166 :
1167 520746 : if (xfs_can_free_eofblocks(ip, false))
1168 172916 : return xfs_free_eofblocks(ip);
1169 :
1170 : /* inode could be preallocated or append-only */
1171 347855 : trace_xfs_inode_free_eofblocks_invalid(ip);
1172 347857 : xfs_inode_clear_eofblocks_tag(ip);
1173 347857 : return 0;
1174 : }
1175 :
1176 : static void
1177 3438167 : xfs_blockgc_set_iflag(
1178 : struct xfs_inode *ip,
1179 : unsigned long iflag)
1180 : {
1181 3438167 : struct xfs_mount *mp = ip->i_mount;
1182 3438167 : struct xfs_perag *pag;
1183 :
1184 3438167 : ASSERT((iflag & ~(XFS_IEOFBLOCKS | XFS_ICOWBLOCKS)) == 0);
1185 :
1186 : /*
1187 : * Don't bother locking the AG and looking up in the radix trees
1188 : * if we already know that we have the tag set.
1189 : */
1190 3438167 : if (ip->i_flags & iflag)
1191 : return;
1192 2400084 : spin_lock(&ip->i_flags_lock);
1193 2400073 : ip->i_flags |= iflag;
1194 2400073 : spin_unlock(&ip->i_flags_lock);
1195 :
1196 2400002 : pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
1197 2399999 : spin_lock(&pag->pag_ici_lock);
1198 :
1199 2400101 : xfs_perag_set_inode_tag(pag, XFS_INO_TO_AGINO(mp, ip->i_ino),
1200 : XFS_ICI_BLOCKGC_TAG);
1201 :
1202 2400117 : spin_unlock(&pag->pag_ici_lock);
1203 2400111 : xfs_perag_put(pag);
1204 : }
1205 :
1206 : void
1207 3016144 : xfs_inode_set_eofblocks_tag(
1208 : xfs_inode_t *ip)
1209 : {
1210 3016144 : trace_xfs_inode_set_eofblocks_tag(ip);
1211 3015990 : return xfs_blockgc_set_iflag(ip, XFS_IEOFBLOCKS);
1212 : }
1213 :
1214 : static void
1215 13319054 : xfs_blockgc_clear_iflag(
1216 : struct xfs_inode *ip,
1217 : unsigned long iflag)
1218 : {
1219 13319054 : struct xfs_mount *mp = ip->i_mount;
1220 13319054 : struct xfs_perag *pag;
1221 13319054 : bool clear_tag;
1222 :
1223 13319054 : ASSERT((iflag & ~(XFS_IEOFBLOCKS | XFS_ICOWBLOCKS)) == 0);
1224 :
1225 13319054 : spin_lock(&ip->i_flags_lock);
1226 13318876 : ip->i_flags &= ~iflag;
1227 13318876 : clear_tag = (ip->i_flags & (XFS_IEOFBLOCKS | XFS_ICOWBLOCKS)) == 0;
1228 13318876 : spin_unlock(&ip->i_flags_lock);
1229 :
1230 13318008 : if (!clear_tag)
1231 : return;
1232 :
1233 11767193 : pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
1234 11766898 : spin_lock(&pag->pag_ici_lock);
1235 :
1236 11767337 : xfs_perag_clear_inode_tag(pag, XFS_INO_TO_AGINO(mp, ip->i_ino),
1237 : XFS_ICI_BLOCKGC_TAG);
1238 :
1239 11768607 : spin_unlock(&pag->pag_ici_lock);
1240 11768165 : xfs_perag_put(pag);
1241 : }
1242 :
1243 : void
1244 8776195 : xfs_inode_clear_eofblocks_tag(
1245 : xfs_inode_t *ip)
1246 : {
1247 8776195 : trace_xfs_inode_clear_eofblocks_tag(ip);
1248 8776360 : return xfs_blockgc_clear_iflag(ip, XFS_IEOFBLOCKS);
1249 : }
1250 :
1251 : /*
1252 : * Set ourselves up to free CoW blocks from this file. If it's already clean
1253 : * then we can bail out quickly, but otherwise we must back off if the file
1254 : * is undergoing some kind of write.
1255 : */
1256 : static bool
1257 16726 : xfs_prep_free_cowblocks(
1258 : struct xfs_inode *ip)
1259 : {
1260 : /*
1261 : * Just clear the tag if we have an empty cow fork or none at all. It's
1262 : * possible the inode was fully unshared since it was originally tagged.
1263 : */
1264 33452 : if (!xfs_inode_has_cow_data(ip)) {
1265 1332 : trace_xfs_inode_free_cowblocks_invalid(ip);
1266 1332 : xfs_inode_clear_cowblocks_tag(ip);
1267 1332 : return false;
1268 : }
1269 :
1270 : /*
1271 : * If the mapping is dirty or under writeback we cannot touch the
1272 : * CoW fork. Leave it alone if we're in the midst of a directio.
1273 : */
1274 15394 : if ((VFS_I(ip)->i_state & I_DIRTY_PAGES) ||
1275 11465 : mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY) ||
1276 10329 : mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
1277 : atomic_read(&VFS_I(ip)->i_dio_count))
1278 5067 : return false;
1279 :
1280 : return true;
1281 : }
1282 :
1283 : /*
1284 : * Automatic CoW Reservation Freeing
1285 : *
1286 : * These functions automatically garbage collect leftover CoW reservations
1287 : * that were made on behalf of a cowextsize hint when we start to run out
1288 : * of quota or when the reservations sit around for too long. If the file
1289 : * has dirty pages or is undergoing writeback, its CoW reservations will
1290 : * be retained.
1291 : *
1292 : * The actual garbage collection piggybacks off the same code that runs
1293 : * the speculative EOF preallocation garbage collector.
1294 : */
1295 : STATIC int
1296 983310 : xfs_inode_free_cowblocks(
1297 : struct xfs_inode *ip,
1298 : struct xfs_icwalk *icw,
1299 : unsigned int *lockflags)
1300 : {
1301 983310 : bool wait;
1302 983310 : int ret = 0;
1303 :
1304 983310 : wait = icw && (icw->icw_flags & XFS_ICWALK_FLAG_SYNC);
1305 :
1306 1966679 : if (!xfs_iflags_test(ip, XFS_ICOWBLOCKS))
1307 : return 0;
1308 :
1309 11713 : if (!xfs_prep_free_cowblocks(ip))
1310 : return 0;
1311 :
1312 5312 : if (!xfs_icwalk_match(ip, icw))
1313 : return 0;
1314 :
1315 : /*
1316 : * If the caller is waiting, return -EAGAIN to keep the background
1317 : * scanner moving and revisit the inode in a subsequent pass.
1318 : */
1319 8758 : if (!(*lockflags & XFS_IOLOCK_EXCL) &&
1320 3446 : !xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
1321 299 : if (wait)
1322 : return -EAGAIN;
1323 233 : return 0;
1324 : }
1325 5013 : *lockflags |= XFS_IOLOCK_EXCL;
1326 :
1327 5013 : if (!xfs_ilock_nowait(ip, XFS_MMAPLOCK_EXCL)) {
1328 0 : if (wait)
1329 : return -EAGAIN;
1330 0 : return 0;
1331 : }
1332 5014 : *lockflags |= XFS_MMAPLOCK_EXCL;
1333 :
1334 : /*
1335 : * Check again, nobody else should be able to dirty blocks or change
1336 : * the reflink iflag now that we have the first two locks held.
1337 : */
1338 5014 : if (xfs_prep_free_cowblocks(ip))
1339 5014 : ret = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, false);
1340 : return ret;
1341 : }
1342 :
1343 : void
1344 422033 : xfs_inode_set_cowblocks_tag(
1345 : xfs_inode_t *ip)
1346 : {
1347 422033 : trace_xfs_inode_set_cowblocks_tag(ip);
1348 422033 : return xfs_blockgc_set_iflag(ip, XFS_ICOWBLOCKS);
1349 : }
1350 :
1351 : void
1352 4543084 : xfs_inode_clear_cowblocks_tag(
1353 : xfs_inode_t *ip)
1354 : {
1355 4543084 : trace_xfs_inode_clear_cowblocks_tag(ip);
1356 4543074 : return xfs_blockgc_clear_iflag(ip, XFS_ICOWBLOCKS);
1357 : }
1358 :
1359 : /* Disable post-EOF and CoW block auto-reclamation. */
1360 : void
1361 60902 : xfs_blockgc_stop(
1362 : struct xfs_mount *mp)
1363 : {
1364 60902 : struct xfs_perag *pag;
1365 60902 : xfs_agnumber_t agno;
1366 :
1367 60902 : if (!xfs_clear_blockgc_enabled(mp))
1368 14 : return;
1369 :
1370 341638 : for_each_perag(mp, agno, pag)
1371 280750 : cancel_delayed_work_sync(&pag->pag_blockgc_work);
1372 60888 : trace_xfs_blockgc_stop(mp, __return_address);
1373 : }
1374 :
1375 : /* Enable post-EOF and CoW block auto-reclamation. */
1376 : void
1377 60917 : xfs_blockgc_start(
1378 : struct xfs_mount *mp)
1379 : {
1380 60917 : struct xfs_perag *pag;
1381 60917 : xfs_agnumber_t agno;
1382 :
1383 60917 : if (xfs_set_blockgc_enabled(mp))
1384 : return;
1385 :
1386 60913 : trace_xfs_blockgc_start(mp, __return_address);
1387 141961 : for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
1388 81048 : xfs_blockgc_queue(pag);
1389 : }
1390 :
1391 : /* Don't try to run block gc on an inode that's in any of these states. */
1392 : #define XFS_BLOCKGC_NOGRAB_IFLAGS (XFS_INEW | \
1393 : XFS_NEED_INACTIVE | \
1394 : XFS_INACTIVATING | \
1395 : XFS_IRECLAIMABLE | \
1396 : XFS_IRECLAIM)
1397 : /*
1398 : * Decide if the given @ip is eligible for garbage collection of speculative
1399 : * preallocations, and grab it if so. Returns true if it's ready to go or
1400 : * false if we should just ignore it.
1401 : */
1402 : static bool
1403 1631104 : xfs_blockgc_igrab(
1404 : struct xfs_inode *ip)
1405 : {
1406 1631104 : struct inode *inode = VFS_I(ip);
1407 :
1408 1631104 : ASSERT(rcu_read_lock_held());
1409 :
1410 : /* Check for stale RCU freed inode */
1411 1631104 : spin_lock(&ip->i_flags_lock);
1412 1633926 : if (!ip->i_ino)
1413 0 : goto out_unlock_noent;
1414 :
1415 1633926 : if (ip->i_flags & XFS_BLOCKGC_NOGRAB_IFLAGS)
1416 112983 : goto out_unlock_noent;
1417 1520943 : spin_unlock(&ip->i_flags_lock);
1418 :
1419 : /* nothing to sync during shutdown */
1420 3042154 : if (xfs_is_shutdown(ip->i_mount))
1421 : return false;
1422 :
1423 : /* If we can't grab the inode, it must on it's way to reclaim. */
1424 1521136 : if (!igrab(inode))
1425 387 : return false;
1426 :
1427 : /* inode is valid */
1428 : return true;
1429 :
1430 112983 : out_unlock_noent:
1431 112983 : spin_unlock(&ip->i_flags_lock);
1432 112983 : return false;
1433 : }
1434 :
1435 : /* Scan one incore inode for block preallocations that we can remove. */
1436 : static int
1437 1521705 : xfs_blockgc_scan_inode(
1438 : struct xfs_inode *ip,
1439 : struct xfs_icwalk *icw)
1440 : {
1441 1521705 : unsigned int lockflags = 0;
1442 1521705 : int error;
1443 :
1444 1521705 : error = xfs_inode_free_eofblocks(ip, icw, &lockflags);
1445 1521937 : if (error)
1446 538732 : goto unlock;
1447 :
1448 983205 : error = xfs_inode_free_cowblocks(ip, icw, &lockflags);
1449 1522101 : unlock:
1450 1522101 : if (lockflags)
1451 523902 : xfs_iunlock(ip, lockflags);
1452 1521953 : xfs_irele(ip);
1453 1521964 : return error;
1454 : }
1455 :
1456 : /* Background worker that trims preallocated space. */
1457 : void
1458 348555 : xfs_blockgc_worker(
1459 : struct work_struct *work)
1460 : {
1461 348555 : struct xfs_perag *pag = container_of(to_delayed_work(work),
1462 : struct xfs_perag, pag_blockgc_work);
1463 348555 : struct xfs_mount *mp = pag->pag_mount;
1464 348555 : int error;
1465 :
1466 348555 : trace_xfs_blockgc_worker(mp, __return_address);
1467 :
1468 348556 : error = xfs_icwalk_ag(pag, XFS_ICWALK_BLOCKGC, NULL);
1469 348501 : if (error)
1470 0 : xfs_info(mp, "AG %u preallocation gc worker failed, err=%d",
1471 : pag->pag_agno, error);
1472 348501 : xfs_blockgc_queue(pag);
1473 348264 : }
1474 :
1475 : /*
1476 : * Try to free space in the filesystem by purging inactive inodes, eofblocks
1477 : * and cowblocks.
1478 : */
1479 : int
1480 312917 : xfs_blockgc_free_space(
1481 : struct xfs_mount *mp,
1482 : struct xfs_icwalk *icw)
1483 : {
1484 312917 : int error;
1485 :
1486 312917 : trace_xfs_blockgc_free_space(mp, icw, _RET_IP_);
1487 :
1488 312767 : error = xfs_icwalk(mp, XFS_ICWALK_BLOCKGC, icw);
1489 312668 : if (error)
1490 : return error;
1491 :
1492 312609 : return xfs_inodegc_flush(mp);
1493 : }
1494 :
1495 : /*
1496 : * Reclaim all the free space that we can by scheduling the background blockgc
1497 : * and inodegc workers immediately and waiting for them all to clear.
1498 : */
1499 : int
1500 3556158 : xfs_blockgc_flush_all(
1501 : struct xfs_mount *mp)
1502 : {
1503 3556158 : struct xfs_perag *pag;
1504 3556158 : xfs_agnumber_t agno;
1505 :
1506 3556158 : trace_xfs_blockgc_flush_all(mp, __return_address);
1507 :
1508 : /*
1509 : * For each blockgc worker, move its queue time up to now. If it
1510 : * wasn't queued, it will not be requeued. Then flush whatever's
1511 : * left.
1512 : */
1513 3866890 : for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
1514 310933 : mod_delayed_work(pag->pag_mount->m_blockgc_wq,
1515 : &pag->pag_blockgc_work, 0);
1516 :
1517 3864636 : for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
1518 308402 : flush_delayed_work(&pag->pag_blockgc_work);
1519 :
1520 3555710 : return xfs_inodegc_flush(mp);
1521 : }
1522 :
1523 : /*
1524 : * Run cow/eofblocks scans on the supplied dquots. We don't know exactly which
1525 : * quota caused an allocation failure, so we make a best effort by including
1526 : * each quota under low free space conditions (less than 1% free space) in the
1527 : * scan.
1528 : *
1529 : * Callers must not hold any inode's ILOCK. If requesting a synchronous scan
1530 : * (XFS_ICWALK_FLAG_SYNC), the caller also must not hold any inode's IOLOCK or
1531 : * MMAPLOCK.
1532 : */
1533 : int
1534 7701 : xfs_blockgc_free_dquots(
1535 : struct xfs_mount *mp,
1536 : struct xfs_dquot *udqp,
1537 : struct xfs_dquot *gdqp,
1538 : struct xfs_dquot *pdqp,
1539 : unsigned int iwalk_flags)
1540 : {
1541 7701 : struct xfs_icwalk icw = {0};
1542 7701 : bool do_work = false;
1543 :
1544 7701 : if (!udqp && !gdqp && !pdqp)
1545 : return 0;
1546 :
1547 : /*
1548 : * Run a scan to free blocks using the union filter to cover all
1549 : * applicable quotas in a single scan.
1550 : */
1551 7701 : icw.icw_flags = XFS_ICWALK_FLAG_UNION | iwalk_flags;
1552 :
1553 7701 : if (XFS_IS_UQUOTA_ENFORCED(mp) && udqp && xfs_dquot_lowsp(udqp)) {
1554 5250 : icw.icw_uid = make_kuid(mp->m_super->s_user_ns, udqp->q_id);
1555 5250 : icw.icw_flags |= XFS_ICWALK_FLAG_UID;
1556 5250 : do_work = true;
1557 : }
1558 :
1559 7701 : if (XFS_IS_UQUOTA_ENFORCED(mp) && gdqp && xfs_dquot_lowsp(gdqp)) {
1560 7457 : icw.icw_gid = make_kgid(mp->m_super->s_user_ns, gdqp->q_id);
1561 7457 : icw.icw_flags |= XFS_ICWALK_FLAG_GID;
1562 7457 : do_work = true;
1563 : }
1564 :
1565 7701 : if (XFS_IS_PQUOTA_ENFORCED(mp) && pdqp && xfs_dquot_lowsp(pdqp)) {
1566 7481 : icw.icw_prid = pdqp->q_id;
1567 7481 : icw.icw_flags |= XFS_ICWALK_FLAG_PRID;
1568 7481 : do_work = true;
1569 : }
1570 :
1571 7701 : if (!do_work)
1572 : return 0;
1573 :
1574 7563 : return xfs_blockgc_free_space(mp, &icw);
1575 : }
1576 :
1577 : /* Run cow/eofblocks scans on the quotas attached to the inode. */
1578 : int
1579 4820 : xfs_blockgc_free_quota(
1580 : struct xfs_inode *ip,
1581 : unsigned int iwalk_flags)
1582 : {
1583 4820 : return xfs_blockgc_free_dquots(ip->i_mount,
1584 : xfs_inode_dquot(ip, XFS_DQTYPE_USER),
1585 : xfs_inode_dquot(ip, XFS_DQTYPE_GROUP),
1586 : xfs_inode_dquot(ip, XFS_DQTYPE_PROJ), iwalk_flags);
1587 : }
1588 :
1589 : /* XFS Inode Cache Walking Code */
1590 :
1591 : /*
1592 : * The inode lookup is done in batches to keep the amount of lock traffic and
1593 : * radix tree lookups to a minimum. The batch size is a trade off between
1594 : * lookup reduction and stack usage. This is in the reclaim path, so we can't
1595 : * be too greedy.
1596 : */
1597 : #define XFS_LOOKUP_BATCH 32
1598 :
1599 :
1600 : /*
1601 : * Decide if we want to grab this inode in anticipation of doing work towards
1602 : * the goal.
1603 : */
1604 : static inline bool
1605 476475823 : xfs_icwalk_igrab(
1606 : enum xfs_icwalk_goal goal,
1607 : struct xfs_inode *ip,
1608 : struct xfs_icwalk *icw)
1609 : {
1610 476475823 : switch (goal) {
1611 1631068 : case XFS_ICWALK_BLOCKGC:
1612 1631068 : return xfs_blockgc_igrab(ip);
1613 474844755 : case XFS_ICWALK_RECLAIM:
1614 474844755 : return xfs_reclaim_igrab(ip, icw);
1615 : default:
1616 : return false;
1617 : }
1618 : }
1619 :
1620 : /*
1621 : * Process an inode. Each processing function must handle any state changes
1622 : * made by the icwalk igrab function. Return -EAGAIN to skip an inode.
1623 : */
1624 : static inline int
1625 476315717 : xfs_icwalk_process_inode(
1626 : enum xfs_icwalk_goal goal,
1627 : struct xfs_inode *ip,
1628 : struct xfs_perag *pag,
1629 : struct xfs_icwalk *icw)
1630 : {
1631 476315717 : int error = 0;
1632 :
1633 476315717 : switch (goal) {
1634 1521772 : case XFS_ICWALK_BLOCKGC:
1635 1521772 : error = xfs_blockgc_scan_inode(ip, icw);
1636 1521772 : break;
1637 474793945 : case XFS_ICWALK_RECLAIM:
1638 474793945 : xfs_reclaim_inode(ip, pag);
1639 474793945 : break;
1640 : }
1641 476316411 : return error;
1642 : }
1643 :
1644 : /*
1645 : * For a given per-AG structure @pag and a goal, grab qualifying inodes and
1646 : * process them in some manner.
1647 : */
1648 : static int
1649 2161566 : xfs_icwalk_ag(
1650 : struct xfs_perag *pag,
1651 : enum xfs_icwalk_goal goal,
1652 : struct xfs_icwalk *icw)
1653 : {
1654 2161566 : struct xfs_mount *mp = pag->pag_mount;
1655 2161566 : uint32_t first_index;
1656 2161566 : int last_error = 0;
1657 2637552 : int skipped;
1658 2637552 : bool done;
1659 2637552 : int nr_found;
1660 :
1661 2637552 : restart:
1662 2637552 : done = false;
1663 2637552 : skipped = 0;
1664 2637552 : if (goal == XFS_ICWALK_RECLAIM)
1665 1751567 : first_index = READ_ONCE(pag->pag_ici_reclaim_cursor);
1666 : else
1667 : first_index = 0;
1668 : nr_found = 0;
1669 17498284 : do {
1670 17498284 : struct xfs_inode *batch[XFS_LOOKUP_BATCH];
1671 17498284 : int error = 0;
1672 17498284 : int i;
1673 :
1674 17498284 : rcu_read_lock();
1675 :
1676 17489978 : nr_found = radix_tree_gang_lookup_tag(&pag->pag_ici_root,
1677 : (void **) batch, first_index,
1678 : XFS_LOOKUP_BATCH, goal);
1679 17497275 : if (!nr_found) {
1680 1398631 : done = true;
1681 1398631 : rcu_read_unlock();
1682 2641153 : break;
1683 : }
1684 :
1685 : /*
1686 : * Grab the inodes before we drop the lock. if we found
1687 : * nothing, nr == 0 and the loop will be skipped.
1688 : */
1689 492576957 : for (i = 0; i < nr_found; i++) {
1690 476473167 : struct xfs_inode *ip = batch[i];
1691 :
1692 476473167 : if (done || !xfs_icwalk_igrab(goal, ip, icw))
1693 171762 : batch[i] = NULL;
1694 :
1695 : /*
1696 : * Update the index for the next lookup. Catch
1697 : * overflows into the next AG range which can occur if
1698 : * we have inodes in the last block of the AG and we
1699 : * are currently pointing to the last inode.
1700 : *
1701 : * Because we may see inodes that are from the wrong AG
1702 : * due to RCU freeing and reallocation, only update the
1703 : * index if it lies in this AG. It was a race that lead
1704 : * us to see this inode, so another lookup from the
1705 : * same index will not find it again.
1706 : */
1707 476478313 : if (XFS_INO_TO_AGNO(mp, ip->i_ino) != pag->pag_agno)
1708 4192 : continue;
1709 476474121 : first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
1710 476474121 : if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
1711 0 : done = true;
1712 : }
1713 :
1714 : /* unlock now we've grabbed the inodes. */
1715 16103790 : rcu_read_unlock();
1716 :
1717 508698351 : for (i = 0; i < nr_found; i++) {
1718 476490851 : if (!batch[i])
1719 174368 : continue;
1720 476316483 : error = xfs_icwalk_process_inode(goal, batch[i], pag,
1721 : icw);
1722 476316381 : if (error == -EAGAIN) {
1723 538585 : skipped++;
1724 538585 : continue;
1725 : }
1726 475777796 : if (error && last_error != -EFSCORRUPTED)
1727 0 : last_error = error;
1728 : }
1729 :
1730 : /* bail out if the filesystem is corrupted. */
1731 16103710 : if (error == -EFSCORRUPTED)
1732 : break;
1733 :
1734 16103710 : cond_resched();
1735 :
1736 16103406 : if (icw && (icw->icw_flags & XFS_ICWALK_FLAG_SCAN_LIMIT)) {
1737 4410503 : icw->icw_scan_limit -= XFS_LOOKUP_BATCH;
1738 4410503 : if (icw->icw_scan_limit <= 0)
1739 : break;
1740 : }
1741 14860732 : } while (nr_found && !done);
1742 :
1743 2641153 : if (goal == XFS_ICWALK_RECLAIM) {
1744 1751567 : if (done)
1745 508893 : first_index = 0;
1746 1751567 : WRITE_ONCE(pag->pag_ici_reclaim_cursor, first_index);
1747 : }
1748 :
1749 2641153 : if (skipped) {
1750 479631 : delay(1);
1751 475986 : goto restart;
1752 : }
1753 2161522 : return last_error;
1754 : }
1755 :
1756 : /* Walk all incore inodes to achieve a given goal. */
1757 : static int
1758 877487 : xfs_icwalk(
1759 : struct xfs_mount *mp,
1760 : enum xfs_icwalk_goal goal,
1761 : struct xfs_icwalk *icw)
1762 : {
1763 877487 : struct xfs_perag *pag;
1764 877487 : int error = 0;
1765 877487 : int last_error = 0;
1766 877487 : xfs_agnumber_t agno;
1767 :
1768 2690539 : for_each_perag_tag(mp, agno, pag, goal) {
1769 1813080 : error = xfs_icwalk_ag(pag, goal, icw);
1770 1813052 : if (error) {
1771 0 : last_error = error;
1772 0 : if (error == -EFSCORRUPTED) {
1773 0 : xfs_perag_rele(pag);
1774 0 : break;
1775 : }
1776 : }
1777 : }
1778 877408 : return last_error;
1779 : BUILD_BUG_ON(XFS_ICWALK_PRIVATE_FLAGS & XFS_ICWALK_FLAGS_VALID);
1780 : }
1781 :
1782 : #ifdef DEBUG
1783 : static void
1784 0 : xfs_check_delalloc(
1785 : struct xfs_inode *ip,
1786 : int whichfork)
1787 : {
1788 0 : struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
1789 0 : struct xfs_bmbt_irec got;
1790 0 : struct xfs_iext_cursor icur;
1791 :
1792 0 : if (!ifp || !xfs_iext_lookup_extent(ip, ifp, 0, &icur, &got))
1793 0 : return;
1794 0 : do {
1795 0 : if (isnullstartblock(got.br_startblock)) {
1796 0 : xfs_warn(ip->i_mount,
1797 : "ino %llx %s fork has delalloc extent at [0x%llx:0x%llx]",
1798 : ip->i_ino,
1799 : whichfork == XFS_DATA_FORK ? "data" : "cow",
1800 : got.br_startoff, got.br_blockcount);
1801 : }
1802 0 : } while (xfs_iext_next_extent(ifp, &icur, &got));
1803 : }
1804 : #else
1805 : #define xfs_check_delalloc(ip, whichfork) do { } while (0)
1806 : #endif
1807 :
1808 : /* Schedule the inode for reclaim. */
1809 : static void
1810 1055789141 : xfs_inodegc_set_reclaimable(
1811 : struct xfs_inode *ip)
1812 : {
1813 1055789141 : struct xfs_mount *mp = ip->i_mount;
1814 1055789141 : struct xfs_perag *pag;
1815 :
1816 2111578282 : if (!xfs_is_shutdown(mp) && ip->i_delayed_blks) {
1817 0 : xfs_check_delalloc(ip, XFS_DATA_FORK);
1818 0 : xfs_check_delalloc(ip, XFS_COW_FORK);
1819 0 : ASSERT(0);
1820 : }
1821 :
1822 1055789141 : pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
1823 1055879029 : spin_lock(&pag->pag_ici_lock);
1824 1055897114 : spin_lock(&ip->i_flags_lock);
1825 :
1826 2111832854 : if (!xfs_is_shutdown(pag->pag_mount)) {
1827 : /* had better not be on any unlinked list! */
1828 762921198 : ASSERT(!xfs_inode_on_unlinked_list(ip));
1829 762921198 : if (xfs_inode_on_unlinked_list(ip))
1830 2 : xfs_emerg(pag->pag_mount, "IUNLINK mark reclaim ino 0x%llx nlink %u mode 0o%o prevun 0x%x nextun 0x%x", ip->i_ino, VFS_I(ip)->i_nlink, VFS_I(ip)->i_mode, ip->i_prev_unlinked, ip->i_next_unlinked);
1831 : }
1832 :
1833 1055916427 : trace_xfs_inode_set_reclaimable(ip);
1834 1055908120 : ip->i_flags &= ~(XFS_NEED_INACTIVE | XFS_INACTIVATING);
1835 1055908120 : ip->i_flags |= XFS_IRECLAIMABLE;
1836 1055908120 : xfs_perag_set_inode_tag(pag, XFS_INO_TO_AGINO(mp, ip->i_ino),
1837 : XFS_ICI_RECLAIM_TAG);
1838 :
1839 1055844215 : spin_unlock(&ip->i_flags_lock);
1840 1055878578 : spin_unlock(&pag->pag_ici_lock);
1841 1055882802 : xfs_perag_put(pag);
1842 1055839691 : }
1843 :
1844 : /*
1845 : * Free all speculative preallocations and possibly even the inode itself.
1846 : * This is the last chance to make changes to an otherwise unreferenced file
1847 : * before incore reclamation happens.
1848 : */
1849 : static int
1850 47742809 : xfs_inodegc_inactivate(
1851 : struct xfs_inode *ip)
1852 : {
1853 47742809 : int error;
1854 :
1855 47742809 : trace_xfs_inode_inactivating(ip);
1856 47723062 : error = xfs_inactive(ip);
1857 47747974 : xfs_inodegc_set_reclaimable(ip);
1858 47739750 : return error;
1859 :
1860 : }
1861 :
1862 : void
1863 4339680 : xfs_inodegc_worker(
1864 : struct work_struct *work)
1865 : {
1866 4339680 : struct xfs_inodegc *gc = container_of(to_delayed_work(work),
1867 : struct xfs_inodegc, work);
1868 4339680 : struct llist_node *node = llist_del_all(&gc->list);
1869 4336489 : struct xfs_inode *ip, *n;
1870 4336489 : unsigned int nofs_flag;
1871 :
1872 4336489 : ASSERT(gc->cpu == smp_processor_id());
1873 :
1874 4334609 : WRITE_ONCE(gc->items, 0);
1875 :
1876 4334609 : if (!node)
1877 : return;
1878 :
1879 : /*
1880 : * We can allocate memory here while doing writeback on behalf of
1881 : * memory reclaim. To avoid memory allocation deadlocks set the
1882 : * task-wide nofs context for the following operations.
1883 : */
1884 4331714 : nofs_flag = memalloc_nofs_save();
1885 :
1886 4331714 : ip = llist_entry(node, struct xfs_inode, i_gclist);
1887 4331714 : trace_xfs_inodegc_worker(ip->i_mount, READ_ONCE(gc->shrinker_hits));
1888 :
1889 4316432 : WRITE_ONCE(gc->shrinker_hits, 0);
1890 52056996 : llist_for_each_entry_safe(ip, n, node, i_gclist) {
1891 47716637 : int error;
1892 :
1893 47716637 : xfs_iflags_set(ip, XFS_INACTIVATING);
1894 47730048 : error = xfs_inodegc_inactivate(ip);
1895 47740564 : if (error && !gc->error)
1896 1781 : gc->error = error;
1897 : }
1898 :
1899 4340359 : memalloc_nofs_restore(nofs_flag);
1900 : }
1901 :
1902 : /*
1903 : * Expedite all pending inodegc work to run immediately. This does not wait for
1904 : * completion of the work.
1905 : */
1906 : void
1907 13099685 : xfs_inodegc_push(
1908 : struct xfs_mount *mp)
1909 : {
1910 26199370 : if (!xfs_is_inodegc_enabled(mp))
1911 : return;
1912 13056441 : trace_xfs_inodegc_push(mp, __return_address);
1913 13004926 : xfs_inodegc_queue_all(mp);
1914 : }
1915 :
1916 : /*
1917 : * Force all currently queued inode inactivation work to run immediately and
1918 : * wait for the work to finish.
1919 : */
1920 : int
1921 4131372 : xfs_inodegc_flush(
1922 : struct xfs_mount *mp)
1923 : {
1924 4131372 : xfs_inodegc_push(mp);
1925 4130978 : trace_xfs_inodegc_flush(mp, __return_address);
1926 4130789 : return xfs_inodegc_wait_all(mp);
1927 : }
1928 :
1929 : /*
1930 : * Flush all the pending work and then disable the inode inactivation background
1931 : * workers and wait for them to stop. Caller must hold sb->s_umount to
1932 : * coordinate changes in the inodegc_enabled state.
1933 : */
1934 : void
1935 60930 : xfs_inodegc_stop(
1936 : struct xfs_mount *mp)
1937 : {
1938 60930 : bool rerun;
1939 :
1940 60930 : if (!xfs_clear_inodegc_enabled(mp))
1941 : return;
1942 :
1943 : /*
1944 : * Drain all pending inodegc work, including inodes that could be
1945 : * queued by racing xfs_inodegc_queue or xfs_inodegc_shrinker_scan
1946 : * threads that sample the inodegc state just prior to us clearing it.
1947 : * The inodegc flag state prevents new threads from queuing more
1948 : * inodes, so we queue pending work items and flush the workqueue until
1949 : * all inodegc lists are empty. IOWs, we cannot use drain_workqueue
1950 : * here because it does not allow other unserialized mechanisms to
1951 : * reschedule inodegc work while this draining is in progress.
1952 : */
1953 60916 : xfs_inodegc_queue_all(mp);
1954 60916 : do {
1955 60916 : flush_workqueue(mp->m_inodegc_wq);
1956 60916 : rerun = xfs_inodegc_queue_all(mp);
1957 60916 : } while (rerun);
1958 :
1959 60916 : trace_xfs_inodegc_stop(mp, __return_address);
1960 : }
1961 :
1962 : /*
1963 : * Enable the inode inactivation background workers and schedule deferred inode
1964 : * inactivation work if there is any. Caller must hold sb->s_umount to
1965 : * coordinate changes in the inodegc_enabled state.
1966 : */
1967 : void
1968 60917 : xfs_inodegc_start(
1969 : struct xfs_mount *mp)
1970 : {
1971 60917 : if (xfs_set_inodegc_enabled(mp))
1972 : return;
1973 :
1974 60913 : trace_xfs_inodegc_start(mp, __return_address);
1975 60913 : xfs_inodegc_queue_all(mp);
1976 : }
1977 :
1978 : #ifdef CONFIG_XFS_RT
1979 : static inline bool
1980 41156996 : xfs_inodegc_want_queue_rt_file(
1981 : struct xfs_inode *ip)
1982 : {
1983 41156996 : struct xfs_mount *mp = ip->i_mount;
1984 :
1985 41156996 : if (!XFS_IS_REALTIME_INODE(ip))
1986 : return false;
1987 :
1988 925696 : if (__percpu_counter_compare(&mp->m_frextents,
1989 925705 : mp->m_low_rtexts[XFS_LOWSP_5_PCNT],
1990 : XFS_FDBLOCKS_BATCH) < 0)
1991 0 : return true;
1992 :
1993 : return false;
1994 : }
1995 : #else
1996 : # define xfs_inodegc_want_queue_rt_file(ip) (false)
1997 : #endif /* CONFIG_XFS_RT */
1998 :
1999 : /*
2000 : * Schedule the inactivation worker when:
2001 : *
2002 : * - We've accumulated more than one inode cluster buffer's worth of inodes.
2003 : * - There is less than 5% free space left.
2004 : * - Any of the quotas for this inode are near an enforcement limit.
2005 : */
2006 : static inline bool
2007 47747037 : xfs_inodegc_want_queue_work(
2008 : struct xfs_inode *ip,
2009 : unsigned int items)
2010 : {
2011 47747037 : struct xfs_mount *mp = ip->i_mount;
2012 :
2013 47747037 : if (items > mp->m_ino_geo.inodes_per_cluster)
2014 : return true;
2015 :
2016 41276475 : if (__percpu_counter_compare(&mp->m_fdblocks,
2017 41278294 : mp->m_low_space[XFS_LOWSP_5_PCNT],
2018 : XFS_FDBLOCKS_BATCH) < 0)
2019 : return true;
2020 :
2021 41157148 : if (xfs_inodegc_want_queue_rt_file(ip))
2022 : return true;
2023 :
2024 41157482 : if (xfs_inode_near_dquot_enforcement(ip, XFS_DQTYPE_USER))
2025 : return true;
2026 :
2027 41156751 : if (xfs_inode_near_dquot_enforcement(ip, XFS_DQTYPE_GROUP))
2028 : return true;
2029 :
2030 41156929 : if (xfs_inode_near_dquot_enforcement(ip, XFS_DQTYPE_PROJ))
2031 38 : return true;
2032 :
2033 : return false;
2034 : }
2035 :
2036 : /*
2037 : * Upper bound on the number of inodes in each AG that can be queued for
2038 : * inactivation at any given time, to avoid monopolizing the workqueue.
2039 : */
2040 : #define XFS_INODEGC_MAX_BACKLOG (4 * XFS_INODES_PER_CHUNK)
2041 :
2042 : /*
2043 : * Make the frontend wait for inactivations when:
2044 : *
2045 : * - Memory shrinkers queued the inactivation worker and it hasn't finished.
2046 : * - The queue depth exceeds the maximum allowable percpu backlog.
2047 : *
2048 : * Note: If the current thread is running a transaction, we don't ever want to
2049 : * wait for other transactions because that could introduce a deadlock.
2050 : */
2051 : static inline bool
2052 : xfs_inodegc_want_flush_work(
2053 : struct xfs_inode *ip,
2054 : unsigned int items,
2055 : unsigned int shrinker_hits)
2056 : {
2057 47743231 : if (current->journal_info)
2058 : return false;
2059 :
2060 47710529 : if (shrinker_hits > 0)
2061 : return true;
2062 :
2063 47710521 : if (items > XFS_INODEGC_MAX_BACKLOG)
2064 : return true;
2065 :
2066 : return false;
2067 : }
2068 :
2069 : /*
2070 : * Queue a background inactivation worker if there are inodes that need to be
2071 : * inactivated and higher level xfs code hasn't disabled the background
2072 : * workers.
2073 : */
2074 : static void
2075 47745422 : xfs_inodegc_queue(
2076 : struct xfs_inode *ip)
2077 : {
2078 47745422 : struct xfs_mount *mp = ip->i_mount;
2079 47745422 : struct xfs_inodegc *gc;
2080 47745422 : int items;
2081 47745422 : unsigned int shrinker_hits;
2082 47745422 : unsigned long queue_delay = 1;
2083 :
2084 47745422 : trace_xfs_inode_set_need_inactive(ip);
2085 47746920 : spin_lock(&ip->i_flags_lock);
2086 47746160 : ip->i_flags |= XFS_NEED_INACTIVE;
2087 47746160 : spin_unlock(&ip->i_flags_lock);
2088 :
2089 47745776 : gc = get_cpu_ptr(mp->m_inodegc);
2090 47745864 : llist_add(&ip->i_gclist, &gc->list);
2091 47746981 : items = READ_ONCE(gc->items);
2092 47746981 : WRITE_ONCE(gc->items, items + 1);
2093 47746981 : shrinker_hits = READ_ONCE(gc->shrinker_hits);
2094 :
2095 : /*
2096 : * We queue the work while holding the current CPU so that the work
2097 : * is scheduled to run on this CPU.
2098 : */
2099 95493962 : if (!xfs_is_inodegc_enabled(mp)) {
2100 0 : put_cpu_ptr(gc);
2101 0 : return;
2102 : }
2103 :
2104 47746981 : if (xfs_inodegc_want_queue_work(ip, items))
2105 6588938 : queue_delay = 0;
2106 :
2107 47744517 : trace_xfs_inodegc_queue(mp, __return_address);
2108 47743171 : mod_delayed_work_on(current_cpu(), mp->m_inodegc_wq, &gc->work,
2109 : queue_delay);
2110 47741585 : put_cpu_ptr(gc);
2111 :
2112 47743231 : if (xfs_inodegc_want_flush_work(ip, items, shrinker_hits)) {
2113 1549659 : trace_xfs_inodegc_throttle(mp, __return_address);
2114 1549653 : flush_delayed_work(&gc->work);
2115 : }
2116 : }
2117 :
2118 : /*
2119 : * Fold the dead CPU inodegc queue into the current CPUs queue.
2120 : */
2121 : void
2122 15 : xfs_inodegc_cpu_dead(
2123 : struct xfs_mount *mp,
2124 : unsigned int dead_cpu)
2125 : {
2126 15 : struct xfs_inodegc *dead_gc, *gc;
2127 15 : struct llist_node *first, *last;
2128 15 : unsigned int count = 0;
2129 :
2130 15 : dead_gc = per_cpu_ptr(mp->m_inodegc, dead_cpu);
2131 15 : cancel_delayed_work_sync(&dead_gc->work);
2132 :
2133 15 : if (llist_empty(&dead_gc->list))
2134 : return;
2135 :
2136 0 : first = dead_gc->list.first;
2137 0 : last = first;
2138 0 : while (last->next) {
2139 0 : last = last->next;
2140 0 : count++;
2141 : }
2142 0 : dead_gc->list.first = NULL;
2143 0 : dead_gc->items = 0;
2144 :
2145 : /* Add pending work to current CPU */
2146 0 : gc = get_cpu_ptr(mp->m_inodegc);
2147 0 : llist_add_batch(first, last, &gc->list);
2148 0 : count += READ_ONCE(gc->items);
2149 0 : WRITE_ONCE(gc->items, count);
2150 :
2151 0 : if (xfs_is_inodegc_enabled(mp)) {
2152 0 : trace_xfs_inodegc_queue(mp, __return_address);
2153 0 : mod_delayed_work_on(current_cpu(), mp->m_inodegc_wq, &gc->work,
2154 : 0);
2155 : }
2156 0 : put_cpu_ptr(gc);
2157 : }
2158 :
2159 : /*
2160 : * We set the inode flag atomically with the radix tree tag. Once we get tag
2161 : * lookups on the radix tree, this inode flag can go away.
2162 : *
2163 : * We always use background reclaim here because even if the inode is clean, it
2164 : * still may be under IO and hence we have wait for IO completion to occur
2165 : * before we can reclaim the inode. The background reclaim path handles this
2166 : * more efficiently than we can here, so simply let background reclaim tear down
2167 : * all inodes.
2168 : */
2169 : void
2170 1055699159 : xfs_inode_mark_reclaimable(
2171 : struct xfs_inode *ip)
2172 : {
2173 1055699159 : struct xfs_mount *mp = ip->i_mount;
2174 1055699159 : bool need_inactive;
2175 :
2176 1055699159 : XFS_STATS_INC(mp, vn_reclaim);
2177 :
2178 : /*
2179 : * We should never get here with any of the reclaim flags already set.
2180 : */
2181 2111600570 : ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_ALL_IRECLAIM_FLAGS));
2182 :
2183 1055901411 : need_inactive = xfs_inode_needs_inactive(ip);
2184 1055844905 : if (need_inactive) {
2185 47742134 : xfs_inodegc_queue(ip);
2186 47742134 : return;
2187 : }
2188 :
2189 : /* Going straight to reclaim, so drop the dquots. */
2190 1008102771 : xfs_qm_dqdetach(ip);
2191 1008126179 : xfs_inodegc_set_reclaimable(ip);
2192 : }
2193 :
2194 : /*
2195 : * Register a phony shrinker so that we can run background inodegc sooner when
2196 : * there's memory pressure. Inactivation does not itself free any memory but
2197 : * it does make inodes reclaimable, which eventually frees memory.
2198 : *
2199 : * The count function, seek value, and batch value are crafted to trigger the
2200 : * scan function during the second round of scanning. Hopefully this means
2201 : * that we reclaimed enough memory that initiating metadata transactions won't
2202 : * make things worse.
2203 : */
2204 : #define XFS_INODEGC_SHRINKER_COUNT (1UL << DEF_PRIORITY)
2205 : #define XFS_INODEGC_SHRINKER_BATCH ((XFS_INODEGC_SHRINKER_COUNT / 2) + 1)
2206 :
2207 : static unsigned long
2208 6159 : xfs_inodegc_shrinker_count(
2209 : struct shrinker *shrink,
2210 : struct shrink_control *sc)
2211 : {
2212 6159 : struct xfs_mount *mp = container_of(shrink, struct xfs_mount,
2213 : m_inodegc_shrinker);
2214 6159 : struct xfs_inodegc *gc;
2215 6159 : int cpu;
2216 :
2217 12318 : if (!xfs_is_inodegc_enabled(mp))
2218 : return 0;
2219 :
2220 18147 : for_each_online_cpu(cpu) {
2221 12188 : gc = per_cpu_ptr(mp->m_inodegc, cpu);
2222 12188 : if (!llist_empty(&gc->list))
2223 : return XFS_INODEGC_SHRINKER_COUNT;
2224 : }
2225 :
2226 : return 0;
2227 : }
2228 :
2229 : static unsigned long
2230 136 : xfs_inodegc_shrinker_scan(
2231 : struct shrinker *shrink,
2232 : struct shrink_control *sc)
2233 : {
2234 136 : struct xfs_mount *mp = container_of(shrink, struct xfs_mount,
2235 : m_inodegc_shrinker);
2236 136 : struct xfs_inodegc *gc;
2237 136 : int cpu;
2238 136 : bool no_items = true;
2239 :
2240 272 : if (!xfs_is_inodegc_enabled(mp))
2241 : return SHRINK_STOP;
2242 :
2243 136 : trace_xfs_inodegc_shrinker_scan(mp, sc, __return_address);
2244 :
2245 544 : for_each_online_cpu(cpu) {
2246 272 : gc = per_cpu_ptr(mp->m_inodegc, cpu);
2247 272 : if (!llist_empty(&gc->list)) {
2248 146 : unsigned int h = READ_ONCE(gc->shrinker_hits);
2249 :
2250 146 : WRITE_ONCE(gc->shrinker_hits, h + 1);
2251 146 : mod_delayed_work_on(cpu, mp->m_inodegc_wq, &gc->work, 0);
2252 146 : no_items = false;
2253 : }
2254 : }
2255 :
2256 : /*
2257 : * If there are no inodes to inactivate, we don't want the shrinker
2258 : * to think there's deferred work to call us back about.
2259 : */
2260 136 : if (no_items)
2261 0 : return LONG_MAX;
2262 :
2263 : return SHRINK_STOP;
2264 : }
2265 :
2266 : /* Register a shrinker so we can accelerate inodegc and throttle queuing. */
2267 : int
2268 24115 : xfs_inodegc_register_shrinker(
2269 : struct xfs_mount *mp)
2270 : {
2271 24115 : struct shrinker *shrink = &mp->m_inodegc_shrinker;
2272 :
2273 24115 : shrink->count_objects = xfs_inodegc_shrinker_count;
2274 24115 : shrink->scan_objects = xfs_inodegc_shrinker_scan;
2275 24115 : shrink->seeks = 0;
2276 24115 : shrink->flags = SHRINKER_NONSLAB;
2277 24115 : shrink->batch = XFS_INODEGC_SHRINKER_BATCH;
2278 :
2279 24115 : return register_shrinker(shrink, "xfs-inodegc:%s", mp->m_super->s_id);
2280 : }
|
