Re: [Minios-devel] [UNIKRAFT PATCH 2/7] lib/9pfs: Add 9pfs header

[Costin Lupu <costin.lup@xxxxxxxxx>]

Reviewed-by: Costin Lupu <costin.lupu@xxxxxxxxx>

On 9/7/19 12:59 PM, Vlad-Andrei BĂDOIU (78692) wrote:
> From: Cristian Banu <cristb@xxxxxxxxx>
> 
> This patch adds the 9pfs header which contains the data structures
> used by the file system and helper macros for accessing them from
> VFS structures.
> 
> Signed-off-by: Cristian Banu <cristb@xxxxxxxxx>
> ---
>  lib/9pfs/9pfs.h | 102 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 102 insertions(+)
>  create mode 100644 lib/9pfs/9pfs.h
> 
> diff --git a/lib/9pfs/9pfs.h b/lib/9pfs/9pfs.h
> new file mode 100644
> index 00000000..3571c857
> --- /dev/null
> +++ b/lib/9pfs/9pfs.h
> @@ -0,0 +1,102 @@
> +/* SPDX-License-Identifier: BSD-3-Clause */
> +/*
> + * Authors: Cristian Banu <cristb@xxxxxxxxx>
> + *
> + * Copyright (c) 2019, University Politehnica of Bucharest. All rights 
> reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + *
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of the copyright holder nor the names of its
> + *    contributors may be used to endorse or promote products derived from
> + *    this software without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 
> IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + *
> + * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
> + */
> +
> +#ifndef __UK_9PFS__
> +#define __UK_9PFS__
> +
> +#include <stdbool.h>
> +#include <uk/9pdev.h>
> +#include <uk/9pfid.h>
> +
> +#include <vfscore/prex.h>
> +
> +/*
> + * Currently supports only the 9P2000.u variant of the protocol.
> + */
> +enum uk_9pfs_proto {
> +     UK_9P_PROTO_2000U,
> +     UK_9P_PROTO_MAX
> +};
> +
> +struct uk_9pfs_mount_data {
> +     /* 9P device. */
> +     struct uk_9pdev         *dev;
> +     /* Wanted transport. */
> +     struct uk_9pdev_trans   *trans;
> +     /* Protocol version used. */
> +     enum uk_9pfs_proto      proto;
> +     /* Username to attempt to mount as on the remote server. */
> +     const char              *uname;
> +     /* File tree to access when offered multiple exported filesystems. */
> +     const char              *aname;
> +};
> +
> +struct uk_9pfs_file_data {
> +     /* Fid associated with the 9pfs file. */
> +     struct uk_9pfid        *fid;
> +     /*
> +      * Buffer for persisting results from a 9P read operation across
> +      * readdir() calls.
> +      */
> +     char                   *readdir_buf;
> +     /*
> +      * Offset within the buffer where the stat of the next child can
> +      * be found.
> +      */
> +     int                    readdir_off;
> +     /* Total size of the data in the readdir buf. */
> +     int                    readdir_sz;
> +};
> +
> +struct uk_9pfs_node_data {
> +     /* Fid associated with the vfs node. */
> +     struct uk_9pfid        *fid;
> +     /* Number of files opened from the vfs node. */
> +     int                    nb_open_files;
> +     /* Is a 9P remove call required when nb_open_files reaches 0? */
> +     bool                   removed;
> +};
> +
> +int uk_9pfs_allocate_vnode_data(struct vnode *vp, struct uk_9pfid *fid);
> +void uk_9pfs_free_vnode_data(struct vnode *vp);
> +
> +/* Default readdir buffer size. */
> +#define UK_9PFS_READDIR_BUFSZ        8192
> +
> +#define UK_9PFS_FD(file) ((struct uk_9pfs_file_data *) (file)->f_data)
> +#define UK_9PFS_ND(vnode) ((struct uk_9pfs_node_data *) (vnode)->v_data)
> +#define UK_9PFS_VFID(vnode) (UK_9PFS_ND(vnode)->fid)
> +#define UK_9PFS_MD(mount) ((struct uk_9pfs_mount_data *) (mount)->m_data)
> +
> +#endif /* __UK_9PFS__ */
> 

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