ceph: perform lazy reads when file mode and caps permit

If the file mode is marked as "lazy," perform cached/buffered reads when
the caps permit it.  Adjust the rdcache_gen and invalidation logic
accordingly so that we manage our cache based on the FILE_CACHE -or-
FILE_LAZYIO cap bits.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 389f9dbd9949..5d893d31e399 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -442,8 +442,9 @@ int ceph_fill_file_size(struct inode *inode, int issued,
                          * the file is either opened or mmaped
                          */
                         if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
-                                      CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
-                                      CEPH_CAP_FILE_EXCL)) ||
+                                       CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
+                                       CEPH_CAP_FILE_EXCL|
+                                       CEPH_CAP_FILE_LAZYIO)) ||
                             mapping_mapped(inode->i_mapping) ||
                             __ceph_caps_file_wanted(ci)) {
                                 ci->i_truncate_pending++;