ceph: EIO all operations after forced umount

This patch makes try_get_cap_refs() and __do_request() check
if the file system was forced umount, and return -EIO if it was.
This patch also adds a helper function to drops dirty caps and
wakes up blocking operation.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index ddd5e9471290..27b566874bc1 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2413,6 +2413,14 @@ again:
                         goto out_unlock;
                 }
 
+                if (!__ceph_is_any_caps(ci) &&
+                    ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
+                        dout("get_cap_refs %p forced umount\n", inode);
+                        *err = -EIO;
+                        ret = 1;
+                        goto out_unlock;
+                }
+
                 dout("get_cap_refs %p have %s needed %s\n", inode,
                      ceph_cap_string(have), ceph_cap_string(need));
         }