Hi all,
I found a problem with VFS's namespace_rwlock
(uspace/srv/vfs/vfs_ops.c). It prevents from creating overlayer
filesystems like FUSE's fusexmp.c example [1][2]. Maybe even saving
filesystem data in other filesystem is not possible.
VFS mount => overlayer FS mount => VFS stat on different FS file => deadlock
There is comment near the rwlock:
"This rwlock prevents the race between a triplet-to-VFS-node resolution
and a concurrent VFS operation which modifies the file system namespace."
Is there another way how to prevent this race? Something like different
lock for each mounted FS.
Zdenek
[1]http://bazaar.launchpad.net/~zdenek-bouska/helenos/fuse/view/head:/uspace/srv/fs/fusexmp/fusexmp.c
[2]fuse-2.9.0/example/fusexmp.c
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