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Each WRITE request must carry a valid file descriptor. When a page is written back from a memory mapping, the file through which the page was dirtied is not available, so a new mechananism is needed to find a suitable file in ->writepage(s). A list of fuse_files is added to fuse_inode. The file is removed from the list in fuse_release(). This patch is in preparation for writable mmap support. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>