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215 lines
6.8 KiB
215 lines
6.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* V9FS definitions. |
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* |
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <[email protected]> |
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* Copyright (C) 2002 by Ron Minnich <[email protected]> |
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*/ |
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#ifndef FS_9P_V9FS_H |
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#define FS_9P_V9FS_H |
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#include <linux/backing-dev.h> |
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/** |
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* enum p9_session_flags - option flags for each 9P session |
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* @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions |
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* @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions |
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* @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy |
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* @V9FS_ACCESS_USER: a new attach will be issued for every user (default) |
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* @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client. |
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* @V9FS_ACCESS_ANY: use a single attach for all users |
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* @V9FS_ACCESS_MASK: bit mask of different ACCESS options |
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* @V9FS_POSIX_ACL: POSIX ACLs are enforced |
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* |
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* Session flags reflect options selected by users at mount time |
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*/ |
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#define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \ |
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V9FS_ACCESS_USER | \ |
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V9FS_ACCESS_CLIENT) |
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#define V9FS_ACCESS_MASK V9FS_ACCESS_ANY |
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#define V9FS_ACL_MASK V9FS_POSIX_ACL |
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enum p9_session_flags { |
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V9FS_PROTO_2000U = 0x01, |
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V9FS_PROTO_2000L = 0x02, |
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V9FS_ACCESS_SINGLE = 0x04, |
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V9FS_ACCESS_USER = 0x08, |
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V9FS_ACCESS_CLIENT = 0x10, |
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V9FS_POSIX_ACL = 0x20 |
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}; |
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/* possible values of ->cache */ |
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/** |
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* enum p9_cache_modes - user specified cache preferences |
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* @CACHE_NONE: do not cache data, dentries, or directory contents (default) |
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* @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency |
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* |
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* eventually support loose, tight, time, session, default always none |
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*/ |
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enum p9_cache_modes { |
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CACHE_NONE, |
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CACHE_MMAP, |
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CACHE_LOOSE, |
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CACHE_FSCACHE, |
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nr__p9_cache_modes |
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}; |
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/** |
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* struct v9fs_session_info - per-instance session information |
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* @flags: session options of type &p9_session_flags |
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* @nodev: set to 1 to disable device mapping |
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* @debug: debug level |
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* @afid: authentication handle |
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* @cache: cache mode of type &p9_cache_modes |
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* @cachetag: the tag of the cache associated with this session |
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* @fscache: session cookie associated with FS-Cache |
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* @uname: string user name to mount hierarchy as |
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* @aname: mount specifier for remote hierarchy |
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* @maxdata: maximum data to be sent/recvd per protocol message |
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* @dfltuid: default numeric userid to mount hierarchy as |
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* @dfltgid: default numeric groupid to mount hierarchy as |
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* @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy |
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* @clnt: reference to 9P network client instantiated for this session |
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* @slist: reference to list of registered 9p sessions |
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* |
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* This structure holds state for each session instance established during |
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* a sys_mount() . |
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* |
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* Bugs: there seems to be a lot of state which could be condensed and/or |
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* removed. |
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*/ |
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struct v9fs_session_info { |
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/* options */ |
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unsigned char flags; |
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unsigned char nodev; |
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unsigned short debug; |
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unsigned int afid; |
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unsigned int cache; |
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#ifdef CONFIG_9P_FSCACHE |
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char *cachetag; |
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struct fscache_cookie *fscache; |
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#endif |
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char *uname; /* user name to mount as */ |
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char *aname; /* name of remote hierarchy being mounted */ |
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unsigned int maxdata; /* max data for client interface */ |
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kuid_t dfltuid; /* default uid/muid for legacy support */ |
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kgid_t dfltgid; /* default gid for legacy support */ |
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kuid_t uid; /* if ACCESS_SINGLE, the uid that has access */ |
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struct p9_client *clnt; /* 9p client */ |
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struct list_head slist; /* list of sessions registered with v9fs */ |
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struct rw_semaphore rename_sem; |
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long session_lock_timeout; /* retry interval for blocking locks */ |
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}; |
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/* cache_validity flags */ |
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#define V9FS_INO_INVALID_ATTR 0x01 |
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struct v9fs_inode { |
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#ifdef CONFIG_9P_FSCACHE |
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struct mutex fscache_lock; |
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struct fscache_cookie *fscache; |
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#endif |
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struct p9_qid qid; |
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unsigned int cache_validity; |
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struct p9_fid *writeback_fid; |
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struct mutex v_mutex; |
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struct inode vfs_inode; |
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}; |
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static inline struct v9fs_inode *V9FS_I(const struct inode *inode) |
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{ |
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return container_of(inode, struct v9fs_inode, vfs_inode); |
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} |
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extern int v9fs_show_options(struct seq_file *m, struct dentry *root); |
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struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, |
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char *); |
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extern void v9fs_session_close(struct v9fs_session_info *v9ses); |
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extern void v9fs_session_cancel(struct v9fs_session_info *v9ses); |
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extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses); |
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extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
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unsigned int flags); |
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extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d); |
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extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d); |
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extern int v9fs_vfs_rename(struct user_namespace *mnt_userns, |
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struct inode *old_dir, struct dentry *old_dentry, |
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struct inode *new_dir, struct dentry *new_dentry, |
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unsigned int flags); |
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extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses, |
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struct p9_fid *fid, |
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struct super_block *sb, int new); |
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extern const struct inode_operations v9fs_dir_inode_operations_dotl; |
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extern const struct inode_operations v9fs_file_inode_operations_dotl; |
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extern const struct inode_operations v9fs_symlink_inode_operations_dotl; |
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extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, |
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struct p9_fid *fid, |
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struct super_block *sb, int new); |
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/* other default globals */ |
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#define V9FS_PORT 564 |
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#define V9FS_DEFUSER "nobody" |
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#define V9FS_DEFANAME "" |
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#define V9FS_DEFUID KUIDT_INIT(-2) |
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#define V9FS_DEFGID KGIDT_INIT(-2) |
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static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode) |
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{ |
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return (inode->i_sb->s_fs_info); |
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} |
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static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry) |
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{ |
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return dentry->d_sb->s_fs_info; |
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} |
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static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) |
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{ |
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return v9ses->flags & V9FS_PROTO_2000U; |
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} |
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static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) |
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{ |
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return v9ses->flags & V9FS_PROTO_2000L; |
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} |
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/** |
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* v9fs_get_inode_from_fid - Helper routine to populate an inode by |
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* issuing a attribute request |
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* @v9ses: session information |
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* @fid: fid to issue attribute request for |
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* @sb: superblock on which to create inode |
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* |
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*/ |
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static inline struct inode * |
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v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
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struct super_block *sb) |
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{ |
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if (v9fs_proto_dotl(v9ses)) |
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return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0); |
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else |
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return v9fs_inode_from_fid(v9ses, fid, sb, 0); |
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} |
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/** |
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* v9fs_get_new_inode_from_fid - Helper routine to populate an inode by |
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* issuing a attribute request |
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* @v9ses: session information |
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* @fid: fid to issue attribute request for |
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* @sb: superblock on which to create inode |
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* |
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*/ |
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static inline struct inode * |
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v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
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struct super_block *sb) |
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{ |
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if (v9fs_proto_dotl(v9ses)) |
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return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1); |
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else |
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return v9fs_inode_from_fid(v9ses, fid, sb, 1); |
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} |
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#endif
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