Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2006-2007 Silicon Graphics, Inc.
4 * Copyright (c) 2014 Christoph Hellwig.
5 * All Rights Reserved.
6 */
7#include "xfs.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_bmap.h"
15#include "xfs_bmap_util.h"
16#include "xfs_alloc.h"
17#include "xfs_mru_cache.h"
18#include "xfs_trace.h"
19#include "xfs_ag.h"
20#include "xfs_ag_resv.h"
21#include "xfs_trans.h"
22#include "xfs_filestream.h"
23
24struct xfs_fstrm_item {
25 struct xfs_mru_cache_elem mru;
26 struct xfs_perag *pag; /* AG in use for this directory */
27};
28
29enum xfs_fstrm_alloc {
30 XFS_PICK_USERDATA = 1,
31 XFS_PICK_LOWSPACE = 2,
32};
33
34static void
35xfs_fstrm_free_func(
36 void *data,
37 struct xfs_mru_cache_elem *mru)
38{
39 struct xfs_fstrm_item *item =
40 container_of(mru, struct xfs_fstrm_item, mru);
41 struct xfs_perag *pag = item->pag;
42
43 trace_xfs_filestream_free(pag, mru->key);
44 atomic_dec(&pag->pagf_fstrms);
45 xfs_perag_rele(pag);
46
47 kfree(item);
48}
49
50/*
51 * Scan the AGs starting at start_agno looking for an AG that isn't in use and
52 * has at least minlen blocks free. If no AG is found to match the allocation
53 * requirements, pick the AG with the most free space in it.
54 */
55static int
56xfs_filestream_pick_ag(
57 struct xfs_alloc_arg *args,
58 xfs_ino_t pino,
59 xfs_agnumber_t start_agno,
60 int flags,
61 xfs_extlen_t *longest)
62{
63 struct xfs_mount *mp = args->mp;
64 struct xfs_perag *pag;
65 struct xfs_perag *max_pag = NULL;
66 xfs_extlen_t minlen = *longest;
67 xfs_extlen_t free = 0, minfree, maxfree = 0;
68 xfs_agnumber_t agno;
69 bool first_pass = true;
70 int err;
71
72 /* 2% of an AG's blocks must be free for it to be chosen. */
73 minfree = mp->m_sb.sb_agblocks / 50;
74
75restart:
76 for_each_perag_wrap(mp, start_agno, agno, pag) {
77 trace_xfs_filestream_scan(pag, pino);
78 *longest = 0;
79 err = xfs_bmap_longest_free_extent(pag, NULL, longest);
80 if (err) {
81 if (err != -EAGAIN)
82 break;
83 /* Couldn't lock the AGF, skip this AG. */
84 err = 0;
85 continue;
86 }
87
88 /* Keep track of the AG with the most free blocks. */
89 if (pag->pagf_freeblks > maxfree) {
90 maxfree = pag->pagf_freeblks;
91 if (max_pag)
92 xfs_perag_rele(max_pag);
93 atomic_inc(&pag->pag_active_ref);
94 max_pag = pag;
95 }
96
97 /*
98 * The AG reference count does two things: it enforces mutual
99 * exclusion when examining the suitability of an AG in this
100 * loop, and it guards against two filestreams being established
101 * in the same AG as each other.
102 */
103 if (atomic_inc_return(&pag->pagf_fstrms) <= 1) {
104 if (((minlen && *longest >= minlen) ||
105 (!minlen && pag->pagf_freeblks >= minfree)) &&
106 (!xfs_perag_prefers_metadata(pag) ||
107 !(flags & XFS_PICK_USERDATA) ||
108 (flags & XFS_PICK_LOWSPACE))) {
109 /* Break out, retaining the reference on the AG. */
110 free = pag->pagf_freeblks;
111 break;
112 }
113 }
114
115 /* Drop the reference on this AG, it's not usable. */
116 atomic_dec(&pag->pagf_fstrms);
117 }
118
119 if (err) {
120 xfs_perag_rele(pag);
121 if (max_pag)
122 xfs_perag_rele(max_pag);
123 return err;
124 }
125
126 if (!pag) {
127 /*
128 * Allow a second pass to give xfs_bmap_longest_free_extent()
129 * another attempt at locking AGFs that it might have skipped
130 * over before we fail.
131 */
132 if (first_pass) {
133 first_pass = false;
134 goto restart;
135 }
136
137 /*
138 * We must be low on data space, so run a final lowspace
139 * optimised selection pass if we haven't already.
140 */
141 if (!(flags & XFS_PICK_LOWSPACE)) {
142 flags |= XFS_PICK_LOWSPACE;
143 goto restart;
144 }
145
146 /*
147 * No unassociated AGs are available, so select the AG with the
148 * most free space, regardless of whether it's already in use by
149 * another filestream. It none suit, just use whatever AG we can
150 * grab.
151 */
152 if (!max_pag) {
153 for_each_perag_wrap(args->mp, 0, start_agno, args->pag)
154 break;
155 atomic_inc(&args->pag->pagf_fstrms);
156 *longest = 0;
157 } else {
158 pag = max_pag;
159 free = maxfree;
160 atomic_inc(&pag->pagf_fstrms);
161 }
162 } else if (max_pag) {
163 xfs_perag_rele(max_pag);
164 }
165
166 trace_xfs_filestream_pick(pag, pino, free);
167 args->pag = pag;
168 return 0;
169
170}
171
172static struct xfs_inode *
173xfs_filestream_get_parent(
174 struct xfs_inode *ip)
175{
176 struct inode *inode = VFS_I(ip), *dir = NULL;
177 struct dentry *dentry, *parent;
178
179 dentry = d_find_alias(inode);
180 if (!dentry)
181 goto out;
182
183 parent = dget_parent(dentry);
184 if (!parent)
185 goto out_dput;
186
187 dir = igrab(d_inode(parent));
188 dput(parent);
189
190out_dput:
191 dput(dentry);
192out:
193 return dir ? XFS_I(dir) : NULL;
194}
195
196/*
197 * Lookup the mru cache for an existing association. If one exists and we can
198 * use it, return with an active perag reference indicating that the allocation
199 * will proceed with that association.
200 *
201 * If we have no association, or we cannot use the current one and have to
202 * destroy it, return with longest = 0 to tell the caller to create a new
203 * association.
204 */
205static int
206xfs_filestream_lookup_association(
207 struct xfs_bmalloca *ap,
208 struct xfs_alloc_arg *args,
209 xfs_ino_t pino,
210 xfs_extlen_t *longest)
211{
212 struct xfs_mount *mp = args->mp;
213 struct xfs_perag *pag;
214 struct xfs_mru_cache_elem *mru;
215 int error = 0;
216
217 *longest = 0;
218 mru = xfs_mru_cache_lookup(mp->m_filestream, pino);
219 if (!mru)
220 return 0;
221 /*
222 * Grab the pag and take an extra active reference for the caller whilst
223 * the mru item cannot go away. This means we'll pin the perag with
224 * the reference we get here even if the filestreams association is torn
225 * down immediately after we mark the lookup as done.
226 */
227 pag = container_of(mru, struct xfs_fstrm_item, mru)->pag;
228 atomic_inc(&pag->pag_active_ref);
229 xfs_mru_cache_done(mp->m_filestream);
230
231 trace_xfs_filestream_lookup(pag, ap->ip->i_ino);
232
233 ap->blkno = XFS_AGB_TO_FSB(args->mp, pag->pag_agno, 0);
234 xfs_bmap_adjacent(ap);
235
236 /*
237 * If there is very little free space before we start a filestreams
238 * allocation, we're almost guaranteed to fail to find a large enough
239 * free space available so just use the cached AG.
240 */
241 if (ap->tp->t_flags & XFS_TRANS_LOWMODE) {
242 *longest = 1;
243 goto out_done;
244 }
245
246 error = xfs_bmap_longest_free_extent(pag, args->tp, longest);
247 if (error == -EAGAIN)
248 error = 0;
249 if (error || *longest < args->maxlen) {
250 /* We aren't going to use this perag */
251 *longest = 0;
252 xfs_perag_rele(pag);
253 return error;
254 }
255
256out_done:
257 args->pag = pag;
258 return 0;
259}
260
261static int
262xfs_filestream_create_association(
263 struct xfs_bmalloca *ap,
264 struct xfs_alloc_arg *args,
265 xfs_ino_t pino,
266 xfs_extlen_t *longest)
267{
268 struct xfs_mount *mp = args->mp;
269 struct xfs_mru_cache_elem *mru;
270 struct xfs_fstrm_item *item;
271 xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, pino);
272 int flags = 0;
273 int error;
274
275 /* Changing parent AG association now, so remove the existing one. */
276 mru = xfs_mru_cache_remove(mp->m_filestream, pino);
277 if (mru) {
278 struct xfs_fstrm_item *item =
279 container_of(mru, struct xfs_fstrm_item, mru);
280
281 agno = (item->pag->pag_agno + 1) % mp->m_sb.sb_agcount;
282 xfs_fstrm_free_func(mp, mru);
283 } else if (xfs_is_inode32(mp)) {
284 xfs_agnumber_t rotorstep = xfs_rotorstep;
285
286 agno = (mp->m_agfrotor / rotorstep) % mp->m_sb.sb_agcount;
287 mp->m_agfrotor = (mp->m_agfrotor + 1) %
288 (mp->m_sb.sb_agcount * rotorstep);
289 }
290
291 ap->blkno = XFS_AGB_TO_FSB(args->mp, agno, 0);
292 xfs_bmap_adjacent(ap);
293
294 if (ap->datatype & XFS_ALLOC_USERDATA)
295 flags |= XFS_PICK_USERDATA;
296 if (ap->tp->t_flags & XFS_TRANS_LOWMODE)
297 flags |= XFS_PICK_LOWSPACE;
298
299 *longest = ap->length;
300 error = xfs_filestream_pick_ag(args, pino, agno, flags, longest);
301 if (error)
302 return error;
303
304 /*
305 * We are going to use this perag now, so create an assoication for it.
306 * xfs_filestream_pick_ag() has already bumped the perag fstrms counter
307 * for us, so all we need to do here is take another active reference to
308 * the perag for the cached association.
309 *
310 * If we fail to store the association, we need to drop the fstrms
311 * counter as well as drop the perag reference we take here for the
312 * item. We do not need to return an error for this failure - as long as
313 * we return a referenced AG, the allocation can still go ahead just
314 * fine.
315 */
316 item = kmalloc(sizeof(*item), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
317 if (!item)
318 goto out_put_fstrms;
319
320 atomic_inc(&args->pag->pag_active_ref);
321 item->pag = args->pag;
322 error = xfs_mru_cache_insert(mp->m_filestream, pino, &item->mru);
323 if (error)
324 goto out_free_item;
325 return 0;
326
327out_free_item:
328 xfs_perag_rele(item->pag);
329 kfree(item);
330out_put_fstrms:
331 atomic_dec(&args->pag->pagf_fstrms);
332 return 0;
333}
334
335/*
336 * Search for an allocation group with a single extent large enough for
337 * the request. First we look for an existing association and use that if it
338 * is found. Otherwise, we create a new association by selecting an AG that fits
339 * the allocation criteria.
340 *
341 * We return with a referenced perag in args->pag to indicate which AG we are
342 * allocating into or an error with no references held.
343 */
344int
345xfs_filestream_select_ag(
346 struct xfs_bmalloca *ap,
347 struct xfs_alloc_arg *args,
348 xfs_extlen_t *longest)
349{
350 struct xfs_mount *mp = args->mp;
351 struct xfs_inode *pip;
352 xfs_ino_t ino = 0;
353 int error = 0;
354
355 *longest = 0;
356 args->total = ap->total;
357 pip = xfs_filestream_get_parent(ap->ip);
358 if (pip) {
359 ino = pip->i_ino;
360 error = xfs_filestream_lookup_association(ap, args, ino,
361 longest);
362 xfs_irele(pip);
363 if (error)
364 return error;
365 if (*longest >= args->maxlen)
366 goto out_select;
367 if (ap->tp->t_flags & XFS_TRANS_LOWMODE)
368 goto out_select;
369 }
370
371 error = xfs_filestream_create_association(ap, args, ino, longest);
372 if (error)
373 return error;
374
375out_select:
376 ap->blkno = XFS_AGB_TO_FSB(mp, args->pag->pag_agno, 0);
377 return 0;
378}
379
380void
381xfs_filestream_deassociate(
382 struct xfs_inode *ip)
383{
384 xfs_mru_cache_delete(ip->i_mount->m_filestream, ip->i_ino);
385}
386
387int
388xfs_filestream_mount(
389 xfs_mount_t *mp)
390{
391 /*
392 * The filestream timer tunable is currently fixed within the range of
393 * one second to four minutes, with five seconds being the default. The
394 * group count is somewhat arbitrary, but it'd be nice to adhere to the
395 * timer tunable to within about 10 percent. This requires at least 10
396 * groups.
397 */
398 return xfs_mru_cache_create(&mp->m_filestream, mp,
399 xfs_fstrm_centisecs * 10, 10, xfs_fstrm_free_func);
400}
401
402void
403xfs_filestream_unmount(
404 xfs_mount_t *mp)
405{
406 xfs_mru_cache_destroy(mp->m_filestream);
407}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2006-2007 Silicon Graphics, Inc.
4 * Copyright (c) 2014 Christoph Hellwig.
5 * All Rights Reserved.
6 */
7#include "xfs.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_bmap.h"
15#include "xfs_alloc.h"
16#include "xfs_mru_cache.h"
17#include "xfs_trace.h"
18#include "xfs_ag.h"
19#include "xfs_ag_resv.h"
20#include "xfs_trans.h"
21#include "xfs_filestream.h"
22
23struct xfs_fstrm_item {
24 struct xfs_mru_cache_elem mru;
25 xfs_agnumber_t ag; /* AG in use for this directory */
26};
27
28enum xfs_fstrm_alloc {
29 XFS_PICK_USERDATA = 1,
30 XFS_PICK_LOWSPACE = 2,
31};
32
33/*
34 * Allocation group filestream associations are tracked with per-ag atomic
35 * counters. These counters allow xfs_filestream_pick_ag() to tell whether a
36 * particular AG already has active filestreams associated with it.
37 */
38int
39xfs_filestream_peek_ag(
40 xfs_mount_t *mp,
41 xfs_agnumber_t agno)
42{
43 struct xfs_perag *pag;
44 int ret;
45
46 pag = xfs_perag_get(mp, agno);
47 ret = atomic_read(&pag->pagf_fstrms);
48 xfs_perag_put(pag);
49 return ret;
50}
51
52static int
53xfs_filestream_get_ag(
54 xfs_mount_t *mp,
55 xfs_agnumber_t agno)
56{
57 struct xfs_perag *pag;
58 int ret;
59
60 pag = xfs_perag_get(mp, agno);
61 ret = atomic_inc_return(&pag->pagf_fstrms);
62 xfs_perag_put(pag);
63 return ret;
64}
65
66static void
67xfs_filestream_put_ag(
68 xfs_mount_t *mp,
69 xfs_agnumber_t agno)
70{
71 struct xfs_perag *pag;
72
73 pag = xfs_perag_get(mp, agno);
74 atomic_dec(&pag->pagf_fstrms);
75 xfs_perag_put(pag);
76}
77
78static void
79xfs_fstrm_free_func(
80 void *data,
81 struct xfs_mru_cache_elem *mru)
82{
83 struct xfs_mount *mp = data;
84 struct xfs_fstrm_item *item =
85 container_of(mru, struct xfs_fstrm_item, mru);
86
87 xfs_filestream_put_ag(mp, item->ag);
88 trace_xfs_filestream_free(mp, mru->key, item->ag);
89
90 kmem_free(item);
91}
92
93/*
94 * Scan the AGs starting at startag looking for an AG that isn't in use and has
95 * at least minlen blocks free.
96 */
97static int
98xfs_filestream_pick_ag(
99 struct xfs_inode *ip,
100 xfs_agnumber_t startag,
101 xfs_agnumber_t *agp,
102 int flags,
103 xfs_extlen_t minlen)
104{
105 struct xfs_mount *mp = ip->i_mount;
106 struct xfs_fstrm_item *item;
107 struct xfs_perag *pag;
108 xfs_extlen_t longest, free = 0, minfree, maxfree = 0;
109 xfs_agnumber_t ag, max_ag = NULLAGNUMBER;
110 int err, trylock, nscan;
111
112 ASSERT(S_ISDIR(VFS_I(ip)->i_mode));
113
114 /* 2% of an AG's blocks must be free for it to be chosen. */
115 minfree = mp->m_sb.sb_agblocks / 50;
116
117 ag = startag;
118 *agp = NULLAGNUMBER;
119
120 /* For the first pass, don't sleep trying to init the per-AG. */
121 trylock = XFS_ALLOC_FLAG_TRYLOCK;
122
123 for (nscan = 0; 1; nscan++) {
124 trace_xfs_filestream_scan(mp, ip->i_ino, ag);
125
126 pag = xfs_perag_get(mp, ag);
127
128 if (!pag->pagf_init) {
129 err = xfs_alloc_pagf_init(mp, NULL, ag, trylock);
130 if (err) {
131 xfs_perag_put(pag);
132 if (err != -EAGAIN)
133 return err;
134 /* Couldn't lock the AGF, skip this AG. */
135 continue;
136 }
137 }
138
139 /* Keep track of the AG with the most free blocks. */
140 if (pag->pagf_freeblks > maxfree) {
141 maxfree = pag->pagf_freeblks;
142 max_ag = ag;
143 }
144
145 /*
146 * The AG reference count does two things: it enforces mutual
147 * exclusion when examining the suitability of an AG in this
148 * loop, and it guards against two filestreams being established
149 * in the same AG as each other.
150 */
151 if (xfs_filestream_get_ag(mp, ag) > 1) {
152 xfs_filestream_put_ag(mp, ag);
153 goto next_ag;
154 }
155
156 longest = xfs_alloc_longest_free_extent(pag,
157 xfs_alloc_min_freelist(mp, pag),
158 xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
159 if (((minlen && longest >= minlen) ||
160 (!minlen && pag->pagf_freeblks >= minfree)) &&
161 (!pag->pagf_metadata || !(flags & XFS_PICK_USERDATA) ||
162 (flags & XFS_PICK_LOWSPACE))) {
163
164 /* Break out, retaining the reference on the AG. */
165 free = pag->pagf_freeblks;
166 xfs_perag_put(pag);
167 *agp = ag;
168 break;
169 }
170
171 /* Drop the reference on this AG, it's not usable. */
172 xfs_filestream_put_ag(mp, ag);
173next_ag:
174 xfs_perag_put(pag);
175 /* Move to the next AG, wrapping to AG 0 if necessary. */
176 if (++ag >= mp->m_sb.sb_agcount)
177 ag = 0;
178
179 /* If a full pass of the AGs hasn't been done yet, continue. */
180 if (ag != startag)
181 continue;
182
183 /* Allow sleeping in xfs_alloc_pagf_init() on the 2nd pass. */
184 if (trylock != 0) {
185 trylock = 0;
186 continue;
187 }
188
189 /* Finally, if lowspace wasn't set, set it for the 3rd pass. */
190 if (!(flags & XFS_PICK_LOWSPACE)) {
191 flags |= XFS_PICK_LOWSPACE;
192 continue;
193 }
194
195 /*
196 * Take the AG with the most free space, regardless of whether
197 * it's already in use by another filestream.
198 */
199 if (max_ag != NULLAGNUMBER) {
200 xfs_filestream_get_ag(mp, max_ag);
201 free = maxfree;
202 *agp = max_ag;
203 break;
204 }
205
206 /* take AG 0 if none matched */
207 trace_xfs_filestream_pick(ip, *agp, free, nscan);
208 *agp = 0;
209 return 0;
210 }
211
212 trace_xfs_filestream_pick(ip, *agp, free, nscan);
213
214 if (*agp == NULLAGNUMBER)
215 return 0;
216
217 err = -ENOMEM;
218 item = kmem_alloc(sizeof(*item), KM_MAYFAIL);
219 if (!item)
220 goto out_put_ag;
221
222 item->ag = *agp;
223
224 err = xfs_mru_cache_insert(mp->m_filestream, ip->i_ino, &item->mru);
225 if (err) {
226 if (err == -EEXIST)
227 err = 0;
228 goto out_free_item;
229 }
230
231 return 0;
232
233out_free_item:
234 kmem_free(item);
235out_put_ag:
236 xfs_filestream_put_ag(mp, *agp);
237 return err;
238}
239
240static struct xfs_inode *
241xfs_filestream_get_parent(
242 struct xfs_inode *ip)
243{
244 struct inode *inode = VFS_I(ip), *dir = NULL;
245 struct dentry *dentry, *parent;
246
247 dentry = d_find_alias(inode);
248 if (!dentry)
249 goto out;
250
251 parent = dget_parent(dentry);
252 if (!parent)
253 goto out_dput;
254
255 dir = igrab(d_inode(parent));
256 dput(parent);
257
258out_dput:
259 dput(dentry);
260out:
261 return dir ? XFS_I(dir) : NULL;
262}
263
264/*
265 * Find the right allocation group for a file, either by finding an
266 * existing file stream or creating a new one.
267 *
268 * Returns NULLAGNUMBER in case of an error.
269 */
270xfs_agnumber_t
271xfs_filestream_lookup_ag(
272 struct xfs_inode *ip)
273{
274 struct xfs_mount *mp = ip->i_mount;
275 struct xfs_inode *pip = NULL;
276 xfs_agnumber_t startag, ag = NULLAGNUMBER;
277 struct xfs_mru_cache_elem *mru;
278
279 ASSERT(S_ISREG(VFS_I(ip)->i_mode));
280
281 pip = xfs_filestream_get_parent(ip);
282 if (!pip)
283 return NULLAGNUMBER;
284
285 mru = xfs_mru_cache_lookup(mp->m_filestream, pip->i_ino);
286 if (mru) {
287 ag = container_of(mru, struct xfs_fstrm_item, mru)->ag;
288 xfs_mru_cache_done(mp->m_filestream);
289
290 trace_xfs_filestream_lookup(mp, ip->i_ino, ag);
291 goto out;
292 }
293
294 /*
295 * Set the starting AG using the rotor for inode32, otherwise
296 * use the directory inode's AG.
297 */
298 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
299 xfs_agnumber_t rotorstep = xfs_rotorstep;
300 startag = (mp->m_agfrotor / rotorstep) % mp->m_sb.sb_agcount;
301 mp->m_agfrotor = (mp->m_agfrotor + 1) %
302 (mp->m_sb.sb_agcount * rotorstep);
303 } else
304 startag = XFS_INO_TO_AGNO(mp, pip->i_ino);
305
306 if (xfs_filestream_pick_ag(pip, startag, &ag, 0, 0))
307 ag = NULLAGNUMBER;
308out:
309 xfs_irele(pip);
310 return ag;
311}
312
313/*
314 * Pick a new allocation group for the current file and its file stream.
315 *
316 * This is called when the allocator can't find a suitable extent in the
317 * current AG, and we have to move the stream into a new AG with more space.
318 */
319int
320xfs_filestream_new_ag(
321 struct xfs_bmalloca *ap,
322 xfs_agnumber_t *agp)
323{
324 struct xfs_inode *ip = ap->ip, *pip;
325 struct xfs_mount *mp = ip->i_mount;
326 xfs_extlen_t minlen = ap->length;
327 xfs_agnumber_t startag = 0;
328 int flags = 0;
329 int err = 0;
330 struct xfs_mru_cache_elem *mru;
331
332 *agp = NULLAGNUMBER;
333
334 pip = xfs_filestream_get_parent(ip);
335 if (!pip)
336 goto exit;
337
338 mru = xfs_mru_cache_remove(mp->m_filestream, pip->i_ino);
339 if (mru) {
340 struct xfs_fstrm_item *item =
341 container_of(mru, struct xfs_fstrm_item, mru);
342 startag = (item->ag + 1) % mp->m_sb.sb_agcount;
343 }
344
345 if (ap->datatype & XFS_ALLOC_USERDATA)
346 flags |= XFS_PICK_USERDATA;
347 if (ap->tp->t_flags & XFS_TRANS_LOWMODE)
348 flags |= XFS_PICK_LOWSPACE;
349
350 err = xfs_filestream_pick_ag(pip, startag, agp, flags, minlen);
351
352 /*
353 * Only free the item here so we skip over the old AG earlier.
354 */
355 if (mru)
356 xfs_fstrm_free_func(mp, mru);
357
358 xfs_irele(pip);
359exit:
360 if (*agp == NULLAGNUMBER)
361 *agp = 0;
362 return err;
363}
364
365void
366xfs_filestream_deassociate(
367 struct xfs_inode *ip)
368{
369 xfs_mru_cache_delete(ip->i_mount->m_filestream, ip->i_ino);
370}
371
372int
373xfs_filestream_mount(
374 xfs_mount_t *mp)
375{
376 /*
377 * The filestream timer tunable is currently fixed within the range of
378 * one second to four minutes, with five seconds being the default. The
379 * group count is somewhat arbitrary, but it'd be nice to adhere to the
380 * timer tunable to within about 10 percent. This requires at least 10
381 * groups.
382 */
383 return xfs_mru_cache_create(&mp->m_filestream, mp,
384 xfs_fstrm_centisecs * 10, 10, xfs_fstrm_free_func);
385}
386
387void
388xfs_filestream_unmount(
389 xfs_mount_t *mp)
390{
391 xfs_mru_cache_destroy(mp->m_filestream);
392}