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Subject[PATCH 5/5] fuse: fix synchronous case of fuse_file_put()
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If fuse_file_put() is called with sync==true, the user may be blocked for
a while, until userspace ACKs our FUSE_RELEASE request. This blocking must be
uninterruptible. Otherwise request could be interrupted, but file association
in user space remains.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
---
fs/fuse/file.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index dac3a7c..e6770b8 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -126,6 +126,10 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
struct fuse_req *req = ff->reserved_req;

if (sync) {
+ /* Must force. Otherwise request could be interrupted,
+ * but file association in user space remains.
+ */
+ req->force = 1;
fuse_request_send(ff->fc, req);
path_put(&req->misc.release.path);
fuse_put_request(ff->fc, req);


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