linux/fs/9p/v9fs.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * V9FS definitions.
 *
 *  Copyright (C) 2004-2008 by Eric Van Hensbergen <[email protected]>
 *  Copyright (C) 2002 by Ron Minnich <[email protected]>
 */
#ifndef FS_9P_V9FS_H
#define FS_9P_V9FS_H

#include <linux/backing-dev.h>
#include <linux/netfs.h>

/**
 * enum p9_session_flags - option flags for each 9P session
 * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions
 * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
 * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy
 * @V9FS_ACCESS_USER: a new attach will be issued for every user (default)
 * @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client.
 * @V9FS_ACCESS_ANY: use a single attach for all users
 * @V9FS_ACCESS_MASK: bit mask of different ACCESS options
 * @V9FS_POSIX_ACL: POSIX ACLs are enforced
 *
 * Session flags reflect options selected by users at mount time
 */
#define V9FS_ACCESS_ANY …
#define V9FS_ACCESS_MASK …
#define V9FS_ACL_MASK …

enum p9_session_flags { … };

/**
 * enum p9_cache_shortcuts - human readable cache preferences
 * @CACHE_SC_NONE: disable all caches
 * @CACHE_SC_READAHEAD: only provide caching for readahead
 * @CACHE_SC_MMAP: provide caching to enable mmap
 * @CACHE_SC_LOOSE: non-coherent caching for files and meta data
 * @CACHE_SC_FSCACHE: persistent non-coherent caching for files and meta-data
 *
 */

enum p9_cache_shortcuts { … };

/**
 * enum p9_cache_bits - possible values of ->cache
 * @CACHE_NONE: caches disabled
 * @CACHE_FILE: file caching (open to close)
 * @CACHE_META: meta-data and directory caching
 * @CACHE_WRITEBACK: write-back caching for files
 * @CACHE_LOOSE: don't check cache consistency
 * @CACHE_FSCACHE: local persistent caches
 *
 */

enum p9_cache_bits { … };

/**
 * struct v9fs_session_info - per-instance session information
 * @flags: session options of type &p9_session_flags
 * @nodev: set to 1 to disable device mapping
 * @debug: debug level
 * @afid: authentication handle
 * @cache: cache mode of type &p9_cache_bits
 * @cachetag: the tag of the cache associated with this session
 * @fscache: session cookie associated with FS-Cache
 * @uname: string user name to mount hierarchy as
 * @aname: mount specifier for remote hierarchy
 * @maxdata: maximum data to be sent/recvd per protocol message
 * @dfltuid: default numeric userid to mount hierarchy as
 * @dfltgid: default numeric groupid to mount hierarchy as
 * @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
 * @clnt: reference to 9P network client instantiated for this session
 * @slist: reference to list of registered 9p sessions
 *
 * This structure holds state for each session instance established during
 * a sys_mount() .
 *
 * Bugs: there seems to be a lot of state which could be condensed and/or
 * removed.
 */

struct v9fs_session_info { … };

/* cache_validity flags */
#define V9FS_INO_INVALID_ATTR …

struct v9fs_inode { … };

static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
{ … }

static inline struct fscache_cookie *v9fs_inode_cookie(struct v9fs_inode *v9inode)
{ … }

static inline struct fscache_volume *v9fs_session_cache(struct v9fs_session_info *v9ses)
{ … }


extern int v9fs_show_options(struct seq_file *m, struct dentry *root);

struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
				 const char *dev_name, char *data);
extern void v9fs_session_close(struct v9fs_session_info *v9ses);
extern void v9fs_session_cancel(struct v9fs_session_info *v9ses);
extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
				      unsigned int flags);
extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d);
extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d);
extern int v9fs_vfs_rename(struct mnt_idmap *idmap,
			   struct inode *old_dir, struct dentry *old_dentry,
			   struct inode *new_dir, struct dentry *new_dentry,
			   unsigned int flags);
extern struct inode *v9fs_fid_iget(struct super_block *sb, struct p9_fid *fid,
						bool new);
extern const struct inode_operations v9fs_dir_inode_operations_dotl;
extern const struct inode_operations v9fs_file_inode_operations_dotl;
extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
extern const struct netfs_request_ops v9fs_req_ops;
extern struct inode *v9fs_fid_iget_dotl(struct super_block *sb,
						struct p9_fid *fid, bool new);

/* other default globals */
#define V9FS_PORT …
#define V9FS_DEFUSER …
#define V9FS_DEFANAME …
#define V9FS_DEFUID …
#define V9FS_DEFGID …

static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
{ … }

static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry)
{ … }

static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses)
{ … }

static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
{ … }

/**
 * v9fs_get_inode_from_fid - Helper routine to populate an inode by
 * issuing a attribute request
 * @v9ses: session information
 * @fid: fid to issue attribute request for
 * @sb: superblock on which to create inode
 *
 */
static inline struct inode *
v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
			struct super_block *sb, bool new)
{ … }

#endif