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Mapped mode stores extended attributes in the user space of the extended attributes. Given that the user space extended attributes are available to regular files only, special files are created as regular files on the fileserver and appropriate mode bits are added to the extended attributes. This method presents all special files and symlinks as regular files on the fileserver while they are represented as special files on the guest mount. Implemntation of symlink in mapped security model: A regular file is created and the link target is written to it. readlink() reads it back from the file. On Guest/Client: lrwxrwxrwx 1 root root 6 2010-05-11 12:20 asymlink -> afile On Host/Fileserver: -rw-------. 1 root root 6 2010-05-11 09:20 asymlink afile Under passthrough model, it just calls underlying symlink() readlink() system calls are used. Under both security models, client user credentials are changed after the filesystem objec creation. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Read the documentation in qemu-doc.html. Fabrice Bellard.