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authorYan, Zheng <zyan@redhat.com>2016-08-24 11:33:46 +0800
committerIlya Dryomov <idryomov@gmail.com>2016-10-03 16:13:49 +0200
commit1afe478569ba7414dde8a874dda9c1ea621c0c63 (patch)
tree1a4b24ecb88e64c8cb7d4870afd2a126655cdf6c
parent0dcc685e7dd7190dcaa5435e9c14150f1d405b7b (diff)
ceph: fix error handling of start_read()
If start_page() fails to add a page to page cache or fails to send OSD request. It should cal put_page() (instead of free_page()) for relevant pages. Besides, start_page() need to cancel fscache readpage if it fails to send OSD request. Signed-off-by: Yan, Zheng <zyan@redhat.com> Reported-by: Zhi Zhang <zhang.david2011@gmail.com>
-rw-r--r--fs/ceph/addr.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index d5b6f959a3c3..f410a0cb57e3 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -298,14 +298,6 @@ unlock:
kfree(osd_data->pages);
}
-static void ceph_unlock_page_vector(struct page **pages, int num_pages)
-{
- int i;
-
- for (i = 0; i < num_pages; i++)
- unlock_page(pages[i]);
-}
-
/*
* start an async read(ahead) operation. return nr_pages we submitted
* a read for on success, or negative error code.
@@ -370,6 +362,10 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
dout("start_read %p add_to_page_cache failed %p\n",
inode, page);
nr_pages = i;
+ if (nr_pages > 0) {
+ len = nr_pages << PAGE_SHIFT;
+ break;
+ }
goto out_pages;
}
pages[i] = page;
@@ -386,8 +382,11 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
return nr_pages;
out_pages:
- ceph_unlock_page_vector(pages, nr_pages);
- ceph_release_page_vector(pages, nr_pages);
+ for (i = 0; i < nr_pages; ++i) {
+ ceph_fscache_readpage_cancel(inode, pages[i]);
+ unlock_page(pages[i]);
+ }
+ ceph_put_page_vector(pages, nr_pages, false);
out:
ceph_osdc_put_request(req);
return ret;