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Subject[PATCH 1/5] fuse: add close_wait flag to fuse_conn
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The feature will be governed by fc->close_wait. Userspace can enable it in
the same way as auto_inval_data or any other kernel fuse capability.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
---
fs/fuse/fuse_i.h | 3 +++
fs/fuse/inode.c | 4 +++-
include/uapi/linux/fuse.h | 3 +++
3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 7aa5c75..434ff08 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -557,6 +557,9 @@ struct fuse_conn {
/** Does the filesystem support asynchronous direct-IO submission? */
unsigned async_dio:1;

+ /** Wait for response from daemon on close */
+ unsigned close_wait: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 754dcf2..580d1b3 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -898,6 +898,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
else
fc->sb->s_time_gran = 1000000000;

+ if (arg->flags & FUSE_CLOSE_WAIT)
+ fc->close_wait = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
@@ -926,7 +928,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
- FUSE_WRITEBACK_CACHE;
+ FUSE_WRITEBACK_CACHE | FUSE_CLOSE_WAIT;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 40b5ca8..1e1b6fa 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -101,6 +101,7 @@
* - add FATTR_CTIME
* - add ctime and ctimensec to fuse_setattr_in
* - add FUSE_RENAME2 request
+ * - add FUSE_CLOSE_WAIT
*/

#ifndef _LINUX_FUSE_H
@@ -229,6 +230,7 @@ struct fuse_file_lock {
* FUSE_READDIRPLUS_AUTO: adaptive readdirplus
* FUSE_ASYNC_DIO: asynchronous direct I/O submission
* FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
+ * FUSE_CLOSE_WAIT: wait for response from daemon on close
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -247,6 +249,7 @@ struct fuse_file_lock {
#define FUSE_READDIRPLUS_AUTO (1 << 14)
#define FUSE_ASYNC_DIO (1 << 15)
#define FUSE_WRITEBACK_CACHE (1 << 16)
+#define FUSE_CLOSE_WAIT (1 << 17)

/**
* CUSE INIT request/reply flags


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