fuse: add flag fc->initialized

Existing flag fc->blocked is used to suspend request allocation both in case
of many background request submitted and period of time before init_reply
arrives from userspace. Next patch will skip blocking allocations of
synchronous request (disregarding fc->blocked). This is mostly OK, but
we still need to suspend allocations if init_reply is not arrived yet. The
patch introduces flag fc->initialized which will serve this purpose.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

4 files changed, 9 insertions, 0 deletions

diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index b7c7f3060635..f563e78852b7 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -505,6 +505,7 @@ static int cuse_channel_open(struct inode *inode, struct file *file)
 
         cc->fc.connected = 1;
         cc->fc.blocked = 0;
+        cc->fc.initialized = 1;
         rc = cuse_send_init(cc);
         if (rc) {
                 fuse_conn_put(&cc->fc);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 3b8301f5c0e1..39c2fe3ba93d 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -2087,6 +2087,7 @@ void fuse_abort_conn(struct fuse_conn *fc)
         if (fc->connected) {
                 fc->connected = 0;
                 fc->blocked = 0;
+                fc->initialized = 1;
                 end_io_requests(fc);
                 end_queued_requests(fc);
                 end_polls(fc);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 47c94d28ff88..6bf30f2af901 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -417,6 +417,10 @@ struct fuse_conn {
         /** Batching of FORGET requests (positive indicates FORGET batch) */
         int forget_batch;
 
+        /** Flag indicating that INIT reply has been received. Allocating
+         * any fuse request will be suspended until the flag is set */
+        int initialized;
+
         /** Flag indicating if connection is blocked.  This will be
             the case before the INIT reply is received, and if there
             are too many outstading backgrounds requests */
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e26607df93df..4958f8099f16 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -363,6 +363,7 @@ void fuse_conn_kill(struct fuse_conn *fc)
         spin_lock(&fc->lock);
         fc->connected = 0;
         fc->blocked = 0;
+        fc->initialized = 1;
         spin_unlock(&fc->lock);
         /* Flush all readers on this fs */
         kill_fasync(&fc->fasync, SIGIO, POLL_IN);
@@ -583,6 +584,7 @@ void fuse_conn_init(struct fuse_conn *fc)
         fc->polled_files = RB_ROOT;
         fc->reqctr = 0;
         fc->blocked = 1;
+        fc->initialized = 0;
         fc->attr_version = 1;
         get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
 }
@@ -882,6 +884,7 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
                 fc->conn_init = 1;
         }
         fc->blocked = 0;
+        fc->initialized = 1;
         wake_up_all(&fc->blocked_waitq);
 }