staging/lustre/llite: drop_caches hangs in cl_inode_fini()

This patch releases cl_pages on error in ll_write_begin()
to avoid memory and object reference leaks. Also, it
reuses per-cpu lu_env in ll_invalidatepage() in the same
way as done in ll_releasepage().

Signed-off-by: Andrew Perepechko <andrew.perepechko@seagate.com>
Seagate-bug-id: MRP-3504
Reviewed-on: http://review.whamcloud.com/22745
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8509
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/llite/rw26.c b/drivers/staging/lustre/lustre/llite/rw26.c
index 1a08a9d526e85d3c03918a38a1d0432cc42780f1..ca45b44dee3308bed7e22c824fa677a81c48d669 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/rw26.c
+++ b/drivers/staging/lustre/lustre/llite/rw26.c
@@ -71,8 +71,6 @@ static void ll_invalidatepage(struct page *vmpage, unsigned int offset,
        struct cl_page   *page;
        struct cl_object *obj;
 
-       int refcheck;
-
        LASSERT(PageLocked(vmpage));
        LASSERT(!PageWriteback(vmpage));
 
@@ -82,21 +80,21 @@ static void ll_invalidatepage(struct page *vmpage, unsigned int offset,
         * happening with locked page too
         */
        if (offset == 0 && length == PAGE_SIZE) {
-               env = cl_env_get(&refcheck);
-               if (!IS_ERR(env)) {
-                       inode = vmpage->mapping->host;
-                       obj = ll_i2info(inode)->lli_clob;
-                       if (obj) {
-                               page = cl_vmpage_page(vmpage, obj);
-                               if (page) {
-                                       cl_page_delete(env, page);
-                                       cl_page_put(env, page);
-                               }
-                       } else {
-                               LASSERT(vmpage->private == 0);
+               /* See the comment in ll_releasepage() */
+               env = cl_env_percpu_get();
+               LASSERT(!IS_ERR(env));
+               inode = vmpage->mapping->host;
+               obj = ll_i2info(inode)->lli_clob;
+               if (obj) {
+                       page = cl_vmpage_page(vmpage, obj);
+                       if (page) {
+                               cl_page_delete(env, page);
+                               cl_page_put(env, page);
                        }
-                       cl_env_put(env, &refcheck);
+               } else {
+                       LASSERT(vmpage->private == 0);
                }
+               cl_env_percpu_put(env);
        }
 }
 
@@ -466,9 +464,9 @@ static int ll_write_begin(struct file *file, struct address_space *mapping,
                          struct page **pagep, void **fsdata)
 {
        struct ll_cl_context *lcc;
-       const struct lu_env  *env;
+       const struct lu_env *env = NULL;
        struct cl_io   *io;
-       struct cl_page *page;
+       struct cl_page *page = NULL;
        struct cl_object *clob = ll_i2info(mapping->host)->lli_clob;
        pgoff_t index = pos >> PAGE_SHIFT;
        struct page *vmpage = NULL;
@@ -556,6 +554,10 @@ out:
                        unlock_page(vmpage);
                        put_page(vmpage);
                }
+               if (!IS_ERR_OR_NULL(page)) {
+                       lu_ref_del(&page->cp_reference, "cl_io", io);
+                       cl_page_put(env, page);
+               }
        } else {
                *pagep = vmpage;
                *fsdata = lcc;