| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * V9FS definitions. |
| * |
| * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| */ |
| #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, |
| nr__p9_cache_modes |
| }; |
| |
| /** |
| * 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 rw_semaphore rename_sem; |
| long session_lock_timeout; /* retry interval for blocking locks */ |
| }; |
| |
| /* 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); |
| } |
| |
| extern int v9fs_show_options(struct seq_file *m, struct dentry *root); |
| |
| 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 user_namespace *mnt_userns, |
| 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); |
| } |
| |
| static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry) |
| { |
| return dentry->d_sb->s_fs_info; |
| } |
| |
| static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses) |
| { |
| return v9ses->flags & V9FS_PROTO_2000U; |
| } |
| |
| static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses) |
| { |
| return v9ses->flags & V9FS_PROTO_2000L; |
| } |
| |
| /** |
| * 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); |
| } |
| |
| /** |
| * 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); |
| } |
| |
| #endif |
