diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/cl_page.c')
-rw-r--r-- | drivers/staging/lustre/lustre/obdclass/cl_page.c | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/cl_page.c b/drivers/staging/lustre/lustre/obdclass/cl_page.c index b754f51..db2dc6b 100644 --- a/drivers/staging/lustre/lustre/obdclass/cl_page.c +++ b/drivers/staging/lustre/lustre/obdclass/cl_page.c @@ -15,11 +15,7 @@ * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see - * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf - * - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, - * CA 95054 USA or visit www.sun.com if you need additional information or - * have any questions. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -1076,3 +1072,49 @@ void cl_page_slice_add(struct cl_page *page, struct cl_page_slice *slice, slice->cpl_page = page; } EXPORT_SYMBOL(cl_page_slice_add); + +/** + * Allocate and initialize cl_cache, called by ll_init_sbi(). + */ +struct cl_client_cache *cl_cache_init(unsigned long lru_page_max) +{ + struct cl_client_cache *cache = NULL; + + cache = kzalloc(sizeof(*cache), GFP_KERNEL); + if (!cache) + return NULL; + + /* Initialize cache data */ + atomic_set(&cache->ccc_users, 1); + cache->ccc_lru_max = lru_page_max; + atomic_set(&cache->ccc_lru_left, lru_page_max); + spin_lock_init(&cache->ccc_lru_lock); + INIT_LIST_HEAD(&cache->ccc_lru); + + atomic_set(&cache->ccc_unstable_nr, 0); + init_waitqueue_head(&cache->ccc_unstable_waitq); + + return cache; +} +EXPORT_SYMBOL(cl_cache_init); + +/** + * Increase cl_cache refcount + */ +void cl_cache_incref(struct cl_client_cache *cache) +{ + atomic_inc(&cache->ccc_users); +} +EXPORT_SYMBOL(cl_cache_incref); + +/** + * Decrease cl_cache refcount and free the cache if refcount=0. + * Since llite, lov and osc all hold cl_cache refcount, + * the free will not cause race. (LU-6173) + */ +void cl_cache_decref(struct cl_client_cache *cache) +{ + if (atomic_dec_and_test(&cache->ccc_users)) + kfree(cache); +} +EXPORT_SYMBOL(cl_cache_decref); |