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-rw-r--r--fs/fuse/dev.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 4967bd40b95..104a62dadb9 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -128,12 +128,16 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
}
}
+/*
+ * Called with sbput_sem held for read (request_end) or write
+ * (fuse_put_super). By the time fuse_put_super() is finished, all
+ * inodes belonging to background requests must be released, so the
+ * iputs have to be done within the locked region.
+ */
void fuse_release_background(struct fuse_conn *fc, struct fuse_req *req)
{
iput(req->inode);
iput(req->inode2);
- if (req->file)
- fput(req->file);
spin_lock(&fc->lock);
list_del(&req->bg_entry);
if (fc->num_background == FUSE_MAX_BACKGROUND) {
@@ -178,6 +182,11 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
if (fc->mounted)
fuse_release_background(fc, req);
up_read(&fc->sbput_sem);
+
+ /* fput must go outside sbput_sem, otherwise it can deadlock */
+ if (req->file)
+ fput(req->file);
+
if (end)
end(fc, req);
else