Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...

Pull fuse fix from Miklos Szeredi:
 "This fixes a deadlock when fuse, direct I/O and loop device are
  combined"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: direct-io: don't dirty ITER_BVEC pages

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f394aff..3988b43 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -530,13 +530,13 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos,
        req->out.args[0].size = count;
 }
 
-static void fuse_release_user_pages(struct fuse_req *req, int write)
+static void fuse_release_user_pages(struct fuse_req *req, bool should_dirty)
 {
        unsigned i;
 
        for (i = 0; i < req->num_pages; i++) {
                struct page *page = req->pages[i];
-               if (write)
+               if (should_dirty)
                        set_page_dirty_lock(page);
                put_page(page);
        }
@@ -1320,6 +1320,7 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
                       loff_t *ppos, int flags)
 {
        int write = flags & FUSE_DIO_WRITE;
+       bool should_dirty = !write && iter_is_iovec(iter);
        int cuse = flags & FUSE_DIO_CUSE;
        struct file *file = io->file;
        struct inode *inode = file->f_mapping->host;
@@ -1363,7 +1364,7 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
                        nres = fuse_send_read(req, io, pos, nbytes, owner);
 
                if (!io->async)
-                       fuse_release_user_pages(req, !write);
+                       fuse_release_user_pages(req, should_dirty);
                if (req->out.h.error) {
                        err = req->out.h.error;
                        break;