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authorDavid Howells <dhowells@redhat.com>2017-03-16 19:27:43 +0300
committerDavid Howells <dhowells@redhat.com>2017-03-16 19:27:43 +0300
commit5611ef280d814042825ee17688f5751266fc538b (patch)
treee2d96d5511f419b64f2633d292426f4de75b8dbc /fs
parent29c8bbbd6e21daa0997d1c3ee886b897ee7ad652 (diff)
downloadlinux-5611ef280d814042825ee17688f5751266fc538b.tar.xz
afs: Fix page overput in afs_fill_page()
afs_fill_page() loads the page it wants to fill into the afs_read request without incrementing its refcount - but then calls afs_put_read() to clean up afterwards, which then releases a ref on the page. Fix this by getting a ref on the page before calling afs_vnode_fetch_data(). This causes sync after a write to hang in afs_writepages_region() because find_get_pages_tag() gets confused and doesn't return. Fixes: 196ee9cd2d04 ("afs: Make afs_fs_fetch_data() take a list of pages") Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marc Dionne <marc.dionne@auristor.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/afs/write.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/afs/write.c b/fs/afs/write.c
index e919e64cd4e0..3ac52f6a96ff 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -101,6 +101,7 @@ static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
req->pos = pos;
req->nr_pages = 1;
req->pages[0] = page;
+ get_page(page);
i_size = i_size_read(&vnode->vfs_inode);
if (pos + PAGE_SIZE > i_size)