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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>
This commit is contained in:
Maxim Patlasov 2013-03-21 18:02:15 +04:00 committed by Miklos Szeredi
parent 8b41e6715e
commit 796523fb24
4 changed files with 9 additions and 0 deletions
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1
fs/fuse/cuse.c
View File

@ -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);

1
fs/fuse/dev.c
View File

@ -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);

4
fs/fuse/fuse_i.h
View File

@ -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 */

3
fs/fuse/inode.c
View File

@ -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);
}