fuse: add FUSE_AUTO_INVAL_DATA init flag

FUSE_AUTO_INVAL_DATA is provided to enable updated/auto cache
invalidation logic.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

2 files changed, 6 insertions, 1 deletions

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 771fb6322c07..e24dd74e3068 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -484,6 +484,9 @@ struct fuse_conn {
         /** Is fallocate not implemented by fs? */
         unsigned no_fallocate:1;
 
+        /** Use enhanced/automatic page cache invalidation. */
+        unsigned auto_inval_data:1;
+
         /** The number of requests waiting for completion */
         atomic_t num_waiting;
 
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 1cd61652018c..dd37ee291b8b 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -834,6 +834,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
                                 fc->big_writes = 1;
                         if (arg->flags & FUSE_DONT_MASK)
                                 fc->dont_mask = 1;
+                        if (arg->flags & FUSE_AUTO_INVAL_DATA)
+                                fc->auto_inval_data = 1;
                 } else {
                         ra_pages = fc->max_read / PAGE_CACHE_SIZE;
                         fc->no_lock = 1;
@@ -859,7 +861,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
         arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
         arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
                 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
-                FUSE_FLOCK_LOCKS;
+                FUSE_FLOCK_LOCKS | FUSE_AUTO_INVAL_DATA;
         req->in.h.opcode = FUSE_INIT;
         req->in.numargs = 1;
         req->in.args[0].size = sizeof(*arg);