257 строки
8.0 KiB
C
257 строки
8.0 KiB
C
/* 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 <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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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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#include <linux/netfs.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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V9FS_NO_XATTR = 0x40,
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V9FS_IGNORE_QV = 0x80, /* ignore qid.version for cache hints */
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V9FS_DIRECT_IO = 0x100,
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V9FS_SYNC = 0x200
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};
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/**
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* enum p9_cache_shortcuts - human readable cache preferences
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* @CACHE_SC_NONE: disable all caches
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* @CACHE_SC_READAHEAD: only provide caching for readahead
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* @CACHE_SC_MMAP: provide caching to enable mmap
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* @CACHE_SC_LOOSE: non-coherent caching for files and meta data
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* @CACHE_SC_FSCACHE: persistent non-coherent caching for files and meta-data
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*
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*/
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enum p9_cache_shortcuts {
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CACHE_SC_NONE = 0b00000000,
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CACHE_SC_READAHEAD = 0b00000001,
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CACHE_SC_MMAP = 0b00000101,
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CACHE_SC_LOOSE = 0b00001111,
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CACHE_SC_FSCACHE = 0b10001111,
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};
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/**
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* enum p9_cache_bits - possible values of ->cache
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* @CACHE_NONE: caches disabled
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* @CACHE_FILE: file caching (open to close)
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* @CACHE_META: meta-data and directory caching
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* @CACHE_WRITEBACK: write-back caching for files
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* @CACHE_LOOSE: don't check cache consistency
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* @CACHE_FSCACHE: local persistent caches
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*
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*/
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enum p9_cache_bits {
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CACHE_NONE = 0b00000000,
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CACHE_FILE = 0b00000001,
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CACHE_META = 0b00000010,
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CACHE_WRITEBACK = 0b00000100,
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CACHE_LOOSE = 0b00001000,
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CACHE_FSCACHE = 0b10000000,
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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_bits
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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 int 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_volume *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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struct netfs_inode netfs; /* Netfslib context and vfs inode */
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struct p9_qid qid;
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unsigned int cache_validity;
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struct mutex v_mutex;
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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, netfs.inode);
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}
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static inline struct fscache_cookie *v9fs_inode_cookie(struct v9fs_inode *v9inode)
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{
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#ifdef CONFIG_9P_FSCACHE
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return netfs_i_cookie(&v9inode->netfs);
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#else
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return NULL;
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#endif
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}
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static inline struct fscache_volume *v9fs_session_cache(struct v9fs_session_info *v9ses)
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{
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#ifdef CONFIG_9P_FSCACHE
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return v9ses->fscache;
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#else
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return NULL;
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#endif
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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 *v9ses,
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const char *dev_name, char *data);
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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 mnt_idmap *idmap,
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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 const struct netfs_request_ops v9fs_req_ops;
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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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