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authorAndrew Gallagher <andrewjcg@fb.com>2014-07-22 16:37:43 +0200
committerMiklos Szeredi <mszeredi@suse.cz>2014-07-22 16:37:43 +0200
commitd7afaec0b564f0609e116f562983b8e72fc3e9c9 (patch)
tree18df4aca0d0cc0427aa3082cfd2c6ac55d22aeff
parenta800bad36619ce47ac0222004635448e6c91ff72 (diff)
fuse: add FUSE_NO_OPEN_SUPPORT flag to INIT
Here some additional changes to set a capability flag so that clients can detect when it's appropriate to return -ENOSYS from open. This amends the following commit introduced in 3.14: 7678ac50615d fuse: support clients that don't implement 'open' However we can only add the flag to 3.15 and later since there was no protocol version update in 3.14. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: <stable@vger.kernel.org> # v3.15+
-rw-r--r--fs/fuse/inode.c2
-rw-r--r--include/uapi/linux/fuse.h3
2 files changed, 4 insertions, 1 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 5ca874f2415b..03246cd9d47a 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -935,7 +935,7 @@ 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_NO_OPEN_SUPPORT;
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 40b5ca8a1b1f..25084a052a1e 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_NO_OPEN_SUPPORT flag
*/
#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_NO_OPEN_SUPPORT: kernel supports zero-message opens
*/
#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_NO_OPEN_SUPPORT (1 << 17)
/**
* CUSE INIT request/reply flags