fuse: Add FOPEN_STREAM to use stream_open()

commit bbd84f33652f852ce5992d65db4d020aba21f882 upstream.

Starting from commit 9c225f2655e3 ("vfs: atomic f_pos accesses as per
POSIX") files opened even via nonseekable_open gate read and write via lock
and do not allow them to be run simultaneously. This can create read vs
write deadlock if a filesystem is trying to implement a socket-like file
which is intended to be simultaneously used for both read and write from
filesystem client.  See commit 10dce8af3422 ("fs: stream_open - opener for
stream-like files so that read and write can run simultaneously without
deadlock") for details and e.g. commit 581d21a2d02a ("xenbus: fix deadlock
on writes to /proc/xen/xenbus") for a similar deadlock example on
/proc/xen/xenbus.

To avoid such deadlock it was tempting to adjust fuse_finish_open to use
stream_open instead of nonseekable_open on just FOPEN_NONSEEKABLE flags,
but grepping through Debian codesearch shows users of FOPEN_NONSEEKABLE,
and in particular GVFS which actually uses offset in its read and write
handlers

	https://codesearch.debian.net/search?q=-%3Enonseekable+%3D
	https://gitlab.gnome.org/GNOME/gvfs/blob/1.40.0-6-gcbc54396/client/gvfsfusedaemon.c#L1080
	https://gitlab.gnome.org/GNOME/gvfs/blob/1.40.0-6-gcbc54396/client/gvfsfusedaemon.c#L1247-1346
	https://gitlab.gnome.org/GNOME/gvfs/blob/1.40.0-6-gcbc54396/client/gvfsfusedaemon.c#L1399-1481

so if we would do such a change it will break a real user.

Add another flag (FOPEN_STREAM) for filesystem servers to indicate that the
opened handler is having stream-like semantics; does not use file position
and thus the kernel is free to issue simultaneous read and write request on
opened file handle.

This patch together with stream_open() should be added to stable kernels
starting from v3.14+. This will allow to patch OSSPD and other FUSE
filesystems that provide stream-like files to return FOPEN_STREAM |
FOPEN_NONSEEKABLE in open handler and this way avoid the deadlock on all
kernel versions. This should work because fuse_finish_open ignores unknown
open flags returned from a filesystem and so passing FOPEN_STREAM to a
kernel that is not aware of this flag cannot hurt. In turn the kernel that
is not aware of FOPEN_STREAM will be < v3.14 where just FOPEN_NONSEEKABLE
is sufficient to implement streams without read vs write deadlock.

Cc: stable@vger.kernel.org # v3.14+
Signed-off-by: Kirill Smelkov <kirr@nexedi.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 50470a73f603112a630fb107169f213700a3b8e7..d2926ac44f83bd023817d530cffbbd86624dc3ae 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -181,7 +181,9 @@ void fuse_finish_open(struct inode *inode, struct file *file)
                file->f_op = &fuse_direct_io_file_operations;
        if (!(ff->open_flags & FOPEN_KEEP_CACHE))
                invalidate_inode_pages2(inode->i_mapping);
-       if (ff->open_flags & FOPEN_NONSEEKABLE)
+       if (ff->open_flags & FOPEN_STREAM)
+               stream_open(inode, file);
+       else if (ff->open_flags & FOPEN_NONSEEKABLE)
                nonseekable_open(inode, file);
        if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) {
                struct fuse_inode *fi = get_fuse_inode(inode);

diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index b4967d48bfdaf90ec19d3767a61c91157855678f..5f7c3a221894afba7d0fea0eaf74c3420637b0bc 100644 (file)
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -226,11 +226,13 @@ struct fuse_file_lock {
  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
  * FOPEN_NONSEEKABLE: the file is not seekable
  * FOPEN_CACHE_DIR: allow caching this directory
+ * FOPEN_STREAM: the file is stream-like (no file position at all)
  */
 #define FOPEN_DIRECT_IO                (1 << 0)
 #define FOPEN_KEEP_CACHE       (1 << 1)
 #define FOPEN_NONSEEKABLE      (1 << 2)
 #define FOPEN_CACHE_DIR                (1 << 3)
+#define FOPEN_STREAM           (1 << 4)
 
 /**
  * INIT request/reply flags