cregit-Linux how code gets into the kernel

Release 4.10 fs/9p/v9fs.h

Directory: fs/9p
/*
 * V9FS definitions.
 *
 *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */
#ifndef FS_9P_V9FS_H

#define FS_9P_V9FS_H

#include <linux/backing-dev.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 (V9FS_ACCESS_SINGLE | \
                         V9FS_ACCESS_USER |   \
                         V9FS_ACCESS_CLIENT)

#define V9FS_ACCESS_MASK V9FS_ACCESS_ANY

#define V9FS_ACL_MASK V9FS_POSIX_ACL


enum p9_session_flags {
	
V9FS_PROTO_2000U	= 0x01,
	
V9FS_PROTO_2000L	= 0x02,
	
V9FS_ACCESS_SINGLE	= 0x04,
	
V9FS_ACCESS_USER	= 0x08,
	
V9FS_ACCESS_CLIENT	= 0x10,
	
V9FS_POSIX_ACL		= 0x20
};

/* possible values of ->cache */
/**
 * enum p9_cache_modes - user specified cache preferences
 * @CACHE_NONE: do not cache data, dentries, or directory contents (default)
 * @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency
 *
 * eventually support loose, tight, time, session, default always none
 */


enum p9_cache_modes {
	
CACHE_NONE,
	
CACHE_MMAP,
	
CACHE_LOOSE,
	
CACHE_FSCACHE,
};

/**
 * 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_modes
 * @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 {
	/* options */
	
unsigned char flags;
	
unsigned char nodev;
	
unsigned short debug;
	
unsigned int afid;
	
unsigned int cache;
#ifdef CONFIG_9P_FSCACHE
	
char *cachetag;
	
struct fscache_cookie *fscache;
#endif

	
char *uname;		/* user name to mount as */
	
char *aname;		/* name of remote hierarchy being mounted */
	
unsigned int maxdata;	/* max data for client interface */
	
kuid_t dfltuid;		/* default uid/muid for legacy support */
	
kgid_t dfltgid;		/* default gid for legacy support */
	
kuid_t uid;		/* if ACCESS_SINGLE, the uid that has access */
	
struct p9_client *clnt;	/* 9p client */
	
struct list_head slist; /* list of sessions registered with v9fs */
	
struct backing_dev_info bdi;
	
struct rw_semaphore rename_sem;
};

/* cache_validity flags */

#define V9FS_INO_INVALID_ATTR 0x01


struct v9fs_inode {
#ifdef CONFIG_9P_FSCACHE
	
struct mutex fscache_lock;
	
struct fscache_cookie *fscache;
#endif
	
struct p9_qid qid;
	
unsigned int cache_validity;
	
struct p9_fid *writeback_fid;
	
struct mutex v_mutex;
	
struct inode vfs_inode;
};


static inline struct v9fs_inode *V9FS_I(const struct inode *inode) { return container_of(inode, struct v9fs_inode, vfs_inode); }

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struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, char *); 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 inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags); extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, struct super_block *sb, int 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 struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, struct super_block *sb, int new); /* other default globals */ #define V9FS_PORT 564 #define V9FS_DEFUSER "nobody" #define V9FS_DEFANAME "" #define V9FS_DEFUID KUIDT_INIT(-2) #define V9FS_DEFGID KGIDT_INIT(-2)
static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) { return (inode->i_sb->s_fs_info); }

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static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry) { return dentry->d_sb->s_fs_info; }

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static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) { return v9ses->flags & V9FS_PROTO_2000U; }

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static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) { return v9ses->flags & V9FS_PROTO_2000L; }

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/** * 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) { if (v9fs_proto_dotl(v9ses)) return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0); else return v9fs_inode_from_fid(v9ses, fid, sb, 0); }

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/** * v9fs_get_new_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_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, struct super_block *sb) { if (v9fs_proto_dotl(v9ses)) return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1); else return v9fs_inode_from_fid(v9ses, fid, sb, 1); }

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#endif

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sripathi kodisripathi kodi284.40%26.06%
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Directory: fs/9p
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