4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
32 * lustre/lod/lod_pool.c
36 * This file provides code related to the Logical Object Device (LOD)
37 * handling of OST Pools on the MDT. Pools are named lists of targets
38 * that allow userspace to group targets that share a particlar property
39 * together so that users or kernel helpers can make decisions about file
40 * allocation based on these properties. For example, pools could be
41 * defined based on fault domains (e.g. separate racks of server nodes) so
42 * that RAID-1 mirroring could select targets from independent fault
43 * domains, or pools could define target performance characteristics so
44 * that applicatins could select IOP-optimized storage or stream-optimized
45 * storage for a particular output file.
47 * This file handles creation, lookup, and removal of pools themselves, as
48 * well as adding and removing targets to pools. It also handles lprocfs
49 * display of configured pool. The pools are accessed by name in the pool
50 * hash, and are refcounted to ensure proper pool structure lifetimes.
52 * Author: Jacques-Charles LAFOUCRIERE <jc.lafoucriere@cea.fr>
53 * Author: Alex Lyashkov <Alexey.Lyashkov@Sun.COM>
54 * Author: Nathaniel Rutman <Nathan.Rutman@Sun.COM>
57 #define DEBUG_SUBSYSTEM S_LOV
59 #include <libcfs/libcfs.h>
60 #include <libcfs/linux/linux-hash.h>
61 #include <libcfs/linux/linux-fs.h>
63 #include "lod_internal.h"
65 #define pool_tgt(_p, _i) OST_TGT(lu2lod_dev((_p)->pool_lobd->obd_lu_dev), \
66 (_p)->pool_obds.op_array[_i])
69 * Get a reference on the specified pool.
71 * To ensure the pool descriptor is not freed before the caller is finished
72 * with it. Any process that is accessing \a pool directly needs to hold
73 * reference on it, including /proc since a userspace thread may be holding
74 * the /proc file open and busy in the kernel.
76 * \param[in] pool pool descriptor on which to gain reference
78 static void pool_getref(struct lod_pool_desc *pool)
80 CDEBUG(D_INFO, "pool %p\n", pool);
81 kref_get(&pool->pool_refcount);
84 static void lod_pool_putref_free(struct kref *kref)
86 struct lod_pool_desc *pool = container_of(kref, struct lod_pool_desc,
89 LASSERT(list_empty(&pool->pool_list));
90 LASSERT(pool->pool_proc_entry == NULL);
91 lu_tgt_pool_free(&(pool->pool_rr.lqr_pool));
92 lu_tgt_pool_free(&(pool->pool_obds));
93 kfree_rcu(pool, pool_rcu);
98 * Drop a reference on the specified pool and free its memory if needed.
100 * One reference is held by the LOD OBD device while it is configured, from
101 * the time the configuration log defines the pool until the time when it is
102 * dropped when the LOD OBD is cleaned up or the pool is deleted. This means
103 * that the pool will not be freed while the LOD device is configured, unless
104 * it is explicitly destroyed by the sysadmin. The pool structure is freed
105 * after the last reference on the structure is released.
107 * \param[in] pool lod pool descriptor to drop reference on and possibly
110 void lod_pool_putref(struct lod_pool_desc *pool)
112 CDEBUG(D_INFO, "pool %p\n", pool);
113 kref_put(&pool->pool_refcount, lod_pool_putref_free);
116 static u32 pool_hashfh(const void *data, u32 len, u32 seed)
118 const char *pool_name = data;
120 return hashlen_hash(cfs_hashlen_string((void *)(unsigned long)seed,
124 static int pool_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
126 const struct lod_pool_desc *pool = obj;
127 const char *pool_name = arg->key;
129 return strcmp(pool_name, pool->pool_name);
132 static const struct rhashtable_params pools_hash_params = {
133 .key_len = 1, /* actually variable */
134 .key_offset = offsetof(struct lod_pool_desc, pool_name),
135 .head_offset = offsetof(struct lod_pool_desc, pool_hash),
136 .hashfn = pool_hashfh,
137 .obj_cmpfn = pool_cmpfn,
138 .automatic_shrinking = true,
142 * Methods for /proc seq_file iteration of the defined pools.
145 #define POOL_IT_MAGIC 0xB001CEA0
146 struct lod_pool_iterator {
147 unsigned int lpi_magic; /* POOL_IT_MAGIC */
148 unsigned int lpi_idx; /* from 0 to pool_tgt_size - 1 */
149 struct lod_pool_desc *lpi_pool;
153 * Return the next configured target within one pool for seq_file iteration.
155 * Iterator is used to go through the target entries of a single pool
156 * (i.e. the list of OSTs configured for a named pool).
157 * lpi_idx is the current target index in the pool's op_array[].
159 * The return type is a void * because this function is one of the
160 * struct seq_operations methods and must match the function template.
162 * \param[in] seq /proc sequence file iteration tracking structure
163 * \param[in] v unused
164 * \param[in] pos position within iteration; 0 to number of targets - 1
166 * \retval struct pool_iterator of the next pool descriptor
168 static void *pool_proc_next(struct seq_file *seq, void *v, loff_t *pos)
170 struct lod_pool_iterator *iter = seq->private;
173 LASSERTF(iter->lpi_magic == POOL_IT_MAGIC, "%08X\n", iter->lpi_magic);
176 /* test if end of file */
177 if (*pos > pool_tgt_count(iter->lpi_pool))
180 CFS_FAIL_TIMEOUT(OBD_FAIL_OST_LIST_ASSERT, cfs_fail_val);
182 /* iterate to find a non empty entry */
183 prev_idx = iter->lpi_idx;
185 if (iter->lpi_idx >= pool_tgt_count(iter->lpi_pool)) {
186 iter->lpi_idx = prev_idx; /* we stay on the last entry */
190 /* return != NULL to continue */
195 * Start seq_file iteration via /proc for a single pool.
197 * The \a pos parameter may be non-zero, indicating that the iteration
198 * is starting at some offset in the target list. Use the seq_file
199 * private field to memorize the iterator so we can free it at stop().
200 * Need to restore the private pointer to the pool before freeing it.
202 * \param[in] seq new sequence file structure to initialize
203 * \param[in] pos initial target number at which to start iteration
205 * \retval initialized pool iterator private structure
206 * \retval NULL if \a pos exceeds the number of targets in \a pool
207 * \retval negative error number on failure
209 static void *pool_proc_start(struct seq_file *seq, loff_t *pos)
211 struct lod_pool_desc *pool = seq->private;
212 struct lod_pool_iterator *iter;
215 if ((pool_tgt_count(pool) == 0) ||
216 (*pos >= pool_tgt_count(pool))) {
217 /* iter is not created, so stop() has no way to
218 * find pool to dec ref */
219 lod_pool_putref(pool);
225 return ERR_PTR(-ENOMEM);
226 iter->lpi_magic = POOL_IT_MAGIC;
227 iter->lpi_pool = pool;
231 down_read(&pool_tgt_rw_sem(pool));
238 ptr = pool_proc_next(seq, &iter, &i);
239 } while ((i < *pos) && (ptr != NULL));
248 * Finish seq_file iteration for a single pool.
250 * Once iteration has been completed, the pool_iterator struct must be
251 * freed, and the seq_file private pointer restored to the pool, as it
252 * was initially when pool_proc_start() was called.
254 * In some cases the stop() method may be called 2 times, without calling
255 * the start() method (see seq_read() from fs/seq_file.c). We have to free
256 * the private iterator struct only if seq->private points to the iterator.
258 * \param[in] seq sequence file structure to clean up
259 * \param[in] v (unused)
261 static void pool_proc_stop(struct seq_file *seq, void *v)
263 struct lod_pool_iterator *iter = seq->private;
265 if (iter != NULL && iter->lpi_magic == POOL_IT_MAGIC) {
266 up_read(&pool_tgt_rw_sem(iter->lpi_pool));
267 seq->private = iter->lpi_pool;
268 lod_pool_putref(iter->lpi_pool);
274 * Print out one target entry from the pool for seq_file iteration.
276 * The currently referenced pool target is given by op_array[lpi_idx].
278 * \param[in] seq new sequence file structure to initialize
279 * \param[in] v (unused)
281 static int pool_proc_show(struct seq_file *seq, void *v)
283 struct lod_pool_iterator *iter = v;
284 struct lod_tgt_desc *tgt;
286 LASSERTF(iter->lpi_magic == POOL_IT_MAGIC, "%08X\n", iter->lpi_magic);
287 LASSERT(iter->lpi_pool != NULL);
288 LASSERT(iter->lpi_idx <= pool_tgt_count(iter->lpi_pool));
290 tgt = pool_tgt(iter->lpi_pool, iter->lpi_idx);
292 seq_printf(seq, "%s\n", obd_uuid2str(&(tgt->ltd_uuid)));
297 static const struct seq_operations pool_proc_ops = {
298 .start = pool_proc_start,
299 .next = pool_proc_next,
300 .stop = pool_proc_stop,
301 .show = pool_proc_show,
305 * Open a new /proc file for seq_file iteration of targets in one pool.
307 * Initialize the seq_file private pointer to reference the pool.
309 * \param inode inode to store iteration state for /proc
310 * \param file file descriptor to store iteration methods
312 * \retval 0 for success
313 * \retval negative error number on failure
315 static int pool_proc_open(struct inode *inode, struct file *file)
319 rc = seq_open(file, &pool_proc_ops);
321 struct seq_file *seq = file->private_data;
322 seq->private = pde_data(inode);
327 const static struct proc_ops pool_proc_operations = {
328 .proc_open = pool_proc_open,
329 .proc_read = seq_read,
330 .proc_lseek = seq_lseek,
331 .proc_release = seq_release,
335 * Dump the pool target list into the Lustre debug log.
337 * This is a debugging function to allow dumping the list of targets
338 * in \a pool to the Lustre kernel debug log at the given \a level.
340 * This is not currently called by any existing code, but can be called
341 * from within gdb/crash to display the contents of the pool, or from
342 * code under development.
344 * \param[in] level Lustre debug level (D_INFO, D_WARN, D_ERROR, etc)
345 * \param[in] pool pool descriptor to be dumped
347 void lod_dump_pool(int level, struct lod_pool_desc *pool)
353 CDEBUG(level, "pool "LOV_POOLNAMEF" has %d members\n",
354 pool->pool_name, pool->pool_obds.op_count);
355 down_read(&pool_tgt_rw_sem(pool));
357 for (i = 0; i < pool_tgt_count(pool) ; i++) {
358 if (!pool_tgt(pool, i) || !(pool_tgt(pool, i))->ltd_exp)
360 CDEBUG(level, "pool "LOV_POOLNAMEF"[%d] = %s\n",
362 obd_uuid2str(&((pool_tgt(pool, i))->ltd_uuid)));
365 up_read(&pool_tgt_rw_sem(pool));
366 lod_pool_putref(pool);
369 static void pools_hash_exit(void *vpool, void *data)
371 struct lod_pool_desc *pool = vpool;
373 lod_pool_putref(pool);
376 int lod_pool_hash_init(struct rhashtable *tbl)
378 return rhashtable_init(tbl, &pools_hash_params);
381 void lod_pool_hash_destroy(struct rhashtable *tbl)
383 rhashtable_free_and_destroy(tbl, pools_hash_exit, NULL);
386 bool lod_pool_exists(struct lod_device *lod, char *poolname)
388 struct lod_pool_desc *pool;
391 pool = rhashtable_lookup(&lod->lod_pools_hash_body,
398 struct lod_pool_desc *lod_pool_find(struct lod_device *lod, char *poolname)
400 struct lod_pool_desc *pool;
403 pool = rhashtable_lookup(&lod->lod_pools_hash_body,
406 if (pool && !kref_get_unless_zero(&pool->pool_refcount))
412 static int lod_ost_pool_weights_seq_show(struct seq_file *m, void *data)
414 struct lod_pool_desc *pool = m->private;
415 struct lod_device *lod = lu2lod_dev(pool->pool_lobd->obd_lu_dev);
417 return lod_tgt_weights_seq_show(m, lod, &pool->pool_obds, false);
421 lod_ost_pool_weights_seq_write(struct file *file, const char __user *buf,
422 size_t count, loff_t *off)
424 struct seq_file *m = file->private_data;
425 struct lod_pool_desc *pool = m->private;
426 struct lod_device *lod = lu2lod_dev(pool->pool_lobd->obd_lu_dev);
428 return lod_tgt_weights_seq_write(m, buf, count, lod, &pool->pool_obds,
431 LDEBUGFS_SEQ_FOPS(lod_ost_pool_weights);
433 static struct ldebugfs_vars ldebugfs_lod_pool_vars[] = {
434 { .name = "qos_ost_weights",
435 .fops = &lod_ost_pool_weights_fops,
441 * Allocate a new pool for the specified device.
443 * Allocate a new pool_desc structure for the specified \a new_pool
444 * device to create a pool with the given \a poolname. The new pool
445 * structure is created with a single reference, and is freed when the
446 * reference count drops to zero.
448 * \param[in] obd Lustre OBD device on which to add a pool iterator
449 * \param[in] poolname the name of the pool to be created
451 * \retval 0 in case of success
452 * \retval negative error code in case of error
454 int lod_pool_new(struct obd_device *obd, char *poolname)
456 struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
457 struct lod_pool_desc *new_pool;
461 if (strlen(poolname) > LOV_MAXPOOLNAME)
462 RETURN(-ENAMETOOLONG);
464 /* OBD_ALLOC_* doesn't work with direct kfree_rcu use */
465 new_pool = kmalloc(sizeof(*new_pool), __GFP_ZERO);
466 if (new_pool == NULL)
469 strscpy(new_pool->pool_name, poolname, sizeof(new_pool->pool_name));
470 new_pool->pool_spill_target[0] = '\0';
471 atomic_set(&new_pool->pool_spill_hit, 0);
472 new_pool->pool_lobd = obd;
473 kref_init(&new_pool->pool_refcount);
474 rc = lu_tgt_pool_init(&new_pool->pool_obds, 0);
476 GOTO(out_free_pool, rc);
478 lu_qos_rr_init(&new_pool->pool_rr);
480 rc = lu_tgt_pool_init(&new_pool->pool_rr.lqr_pool, 0);
482 GOTO(out_free_pool_obds, rc);
484 #ifdef CONFIG_PROC_FS
485 pool_getref(new_pool);
486 new_pool->pool_proc_entry = lprocfs_add_simple(lod->lod_pool_proc_entry,
488 &pool_proc_operations);
489 if (IS_ERR(new_pool->pool_proc_entry)) {
490 CDEBUG(D_CONFIG, "%s: cannot add proc entry "LOV_POOLNAMEF"\n",
491 obd->obd_name, poolname);
492 new_pool->pool_proc_entry = NULL;
493 lod_pool_putref(new_pool);
496 pool_getref(new_pool);
497 new_pool->pool_spill_proc_entry =
498 lprocfs_register(poolname, lod->lod_spill_proc_entry,
499 lprocfs_lod_spill_vars, new_pool);
500 if (IS_ERR(new_pool->pool_spill_proc_entry)) {
501 rc = PTR_ERR(new_pool->pool_spill_proc_entry);
502 new_pool->pool_proc_entry = NULL;
503 lod_pool_putref(new_pool);
506 CDEBUG(D_INFO, "pool %p - proc %p\n", new_pool,
507 new_pool->pool_proc_entry);
510 spin_lock(&obd->obd_dev_lock);
511 list_add_tail(&new_pool->pool_list, &lod->lod_pool_list);
512 lod->lod_pool_count++;
513 spin_unlock(&obd->obd_dev_lock);
515 /* Add to hash table only when it is fully ready. */
516 rc = rhashtable_lookup_insert_fast(&lod->lod_pools_hash_body,
517 &new_pool->pool_hash,
522 * Hide -E2BIG and -EBUSY which
529 new_pool->pool_debugfs = debugfs_create_dir(poolname,
530 lod->lod_pool_debugfs);
531 ldebugfs_add_vars(new_pool->pool_debugfs, ldebugfs_lod_pool_vars,
534 CDEBUG(D_CONFIG, LOV_POOLNAMEF" is pool #%d\n",
535 poolname, lod->lod_pool_count);
540 spin_lock(&obd->obd_dev_lock);
541 list_del_init(&new_pool->pool_list);
542 lod->lod_pool_count--;
543 spin_unlock(&obd->obd_dev_lock);
545 lprocfs_remove(&new_pool->pool_spill_proc_entry);
546 lprocfs_remove(&new_pool->pool_proc_entry);
548 lu_tgt_pool_free(&new_pool->pool_rr.lqr_pool);
550 lu_tgt_pool_free(&new_pool->pool_obds);
552 OBD_FREE_PTR(new_pool);
557 * Remove the named pool from the OBD device.
559 * \param[in] obd OBD device on which pool was previously created
560 * \param[in] poolname name of pool to remove from \a obd
562 * \retval 0 on successfully removing the pool
563 * \retval negative error numbers for failures
565 int lod_pool_del(struct obd_device *obd, char *poolname)
567 struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
568 struct lod_pool_desc *pool;
571 /* lookup and kill hash reference */
573 pool = rhashtable_lookup(&lod->lod_pools_hash_body, poolname,
575 if (pool && rhashtable_remove_fast(&lod->lod_pools_hash_body,
577 pools_hash_params) != 0)
583 debugfs_remove_recursive(pool->pool_debugfs);
585 if (pool->pool_proc_entry != NULL) {
586 CDEBUG(D_INFO, "proc entry %p\n", pool->pool_proc_entry);
587 lprocfs_remove(&pool->pool_proc_entry);
588 lod_pool_putref(pool);
590 if (pool->pool_spill_proc_entry != NULL) {
591 CDEBUG(D_INFO, "proc entry %p\n", pool->pool_spill_proc_entry);
592 lprocfs_remove(&pool->pool_spill_proc_entry);
593 lod_pool_putref(pool);
596 spin_lock(&obd->obd_dev_lock);
597 list_del_init(&pool->pool_list);
598 lod->lod_pool_count--;
599 spin_unlock(&obd->obd_dev_lock);
601 /* release last reference */
602 lod_pool_putref(pool);
608 * Add a single target device to the named pool.
610 * Add the target specified by \a ostname to the specified \a poolname.
612 * \param[in] obd OBD device on which to add the pool
613 * \param[in] poolname name of the pool to which to add the target \a ostname
614 * \param[in] ostname name of the target device to be added
616 * \retval 0 if \a ostname was (previously) added to the named pool
617 * \retval negative error number on failure
619 int lod_pool_add(struct obd_device *obd, char *poolname, char *ostname)
621 struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
622 struct obd_uuid ost_uuid;
623 struct lod_pool_desc *pool;
624 struct lu_tgt_desc *tgt;
628 pool = lod_pool_find(lod, poolname);
632 obd_str2uuid(&ost_uuid, ostname);
634 /* search ost in lod array */
635 lod_getref(&lod->lod_ost_descs);
636 lod_foreach_ost(lod, tgt) {
637 if (obd_uuid_equals(&ost_uuid, &tgt->ltd_uuid)) {
646 rc = lu_tgt_pool_add(&pool->pool_obds, tgt->ltd_index,
651 set_bit(LQ_DIRTY, &pool->pool_rr.lqr_flags);
653 CDEBUG(D_CONFIG, "Added %s to "LOV_POOLNAMEF" as member %d\n",
654 ostname, poolname, pool_tgt_count(pool));
658 lod_putref(lod, &lod->lod_ost_descs);
659 lod_pool_putref(pool);
664 * Remove the named target from the specified pool.
666 * Remove one target named \a ostname from \a poolname. The \a ostname
667 * is searched for in the lod_device lod_ost_bitmap array, to ensure the
668 * specified name actually exists in the pool.
670 * \param[in] obd OBD device from which to remove \a poolname
671 * \param[in] poolname name of the pool to be changed
672 * \param[in] ostname name of the target to remove from \a poolname
674 * \retval 0 on successfully removing \a ostname from the pool
675 * \retval negative number on error (e.g. \a ostname not in pool)
677 int lod_pool_remove(struct obd_device *obd, char *poolname, char *ostname)
679 struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
680 struct lu_tgt_desc *ost;
681 struct obd_uuid ost_uuid;
682 struct lod_pool_desc *pool;
686 /* lookup and kill hash reference */
687 pool = lod_pool_find(lod, poolname);
691 obd_str2uuid(&ost_uuid, ostname);
693 lod_getref(&lod->lod_ost_descs);
694 lod_foreach_ost(lod, ost) {
695 if (obd_uuid_equals(&ost_uuid, &ost->ltd_uuid)) {
701 /* test if ost found in lod array */
705 lu_tgt_pool_remove(&pool->pool_obds, ost->ltd_index);
706 set_bit(LQ_DIRTY, &pool->pool_rr.lqr_flags);
708 CDEBUG(D_CONFIG, "%s removed from "LOV_POOLNAMEF"\n", ostname,
713 lod_putref(lod, &lod->lod_ost_descs);
714 lod_pool_putref(pool);
719 * Check if the specified target exists in the pool.
721 * The caller may not have a reference on \a pool if it got the pool without
722 * calling lod_find_pool() (e.g. directly from the lod pool list)
724 * \param[in] idx Target index to check
725 * \param[in] pool Pool in which to check if target is added.
727 * \retval 0 successfully found index in \a pool
728 * \retval negative error if device not found in \a pool
730 int lod_check_index_in_pool(__u32 idx, struct lod_pool_desc *pool)
735 rc = lu_tgt_check_index(idx, &pool->pool_obds);
736 lod_pool_putref(pool);
741 * Find the pool descriptor for the specified pool and return it with a
742 * reference to the caller if found.
744 * \param[in] lod LOD on which the pools are configured
745 * \param[in] poolname NUL-terminated name of the pool
747 * \retval pointer to pool descriptor on success
748 * \retval NULL if \a poolname could not be found or poolname is empty
750 struct lod_pool_desc *lod_find_pool(struct lod_device *lod, char *poolname)
752 struct lod_pool_desc *pool;
754 if (poolname[0] == '\0' || lov_pool_is_reserved(poolname))
757 pool = lod_pool_find(lod, poolname);
760 "%s: request for an unknown pool (" LOV_POOLNAMEF ")\n",
761 lod->lod_child_exp->exp_obd->obd_name, poolname);
762 if (pool != NULL && pool_tgt_count(pool) == 0) {
763 CDEBUG(D_CONFIG, "%s: request for an empty pool ("
765 lod->lod_child_exp->exp_obd->obd_name, poolname);
766 /* pool is ignored, so we remove ref on it */
767 lod_pool_putref(pool);
774 void lod_spill_target_refresh(const struct lu_env *env, struct lod_device *lod,
775 struct lod_pool_desc *pool)
777 __u64 avail_bytes = 0, total_bytes = 0;
778 struct lu_tgt_pool *osts;
781 if (ktime_get_seconds() < pool->pool_spill_expire)
784 if (pool->pool_spill_threshold_pct == 0)
787 lod_qos_statfs_update(env, lod, &lod->lod_ost_descs);
789 down_write(&pool_tgt_rw_sem(pool));
790 if (ktime_get_seconds() < pool->pool_spill_expire)
792 pool->pool_spill_expire = ktime_get_seconds() +
793 lod->lod_ost_descs.ltd_lov_desc.ld_qos_maxage;
795 osts = &(pool->pool_obds);
796 for (i = 0; i < osts->op_count; i++) {
797 int idx = osts->op_array[i];
798 struct lod_tgt_desc *tgt;
799 struct obd_statfs *sfs;
801 if (!test_bit(idx, lod->lod_ost_bitmap))
803 tgt = OST_TGT(lod, idx);
804 if (!tgt->ltd_active)
806 sfs = &tgt->ltd_statfs;
808 avail_bytes += sfs->os_bavail * sfs->os_bsize;
809 total_bytes += sfs->os_blocks * sfs->os_bsize;
811 if (total_bytes - avail_bytes >=
812 total_bytes * pool->pool_spill_threshold_pct / 100)
813 pool->pool_spill_is_active = true;
815 pool->pool_spill_is_active = false;
818 up_write(&pool_tgt_rw_sem(pool));
822 * XXX: consider a better schema to detect loops
824 void lod_check_and_spill_pool(const struct lu_env *env, struct lod_device *lod,
827 struct lod_pool_desc *pool;
829 if (!poolname || !*poolname || (*poolname)[0] == '\0')
832 pool = lod_pool_find(lod, *poolname);
836 lod_spill_target_refresh(env, lod, pool);
837 if (pool->pool_spill_is_active) {
838 lod_set_pool(poolname, pool->pool_spill_target);
839 atomic_inc(&pool->pool_spill_hit);
840 lod_pool_putref(pool);
844 lod_pool_putref(pool);