file-op-9p.h · samitouri/QOSamiQemu

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1	/*
2	* 9p
3	*
4	* Copyright IBM, Corp. 2010
5	*
6	* Authors:
7	* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
8	*
9	* This work is licensed under the terms of the GNU GPL, version 2. See
10	* the COPYING file in the top-level directory.
11	*
12	*/
13
14	#ifndef FILE_OP_9P_H
15	#define FILE_OP_9P_H
16
17	#include <dirent.h>
18	#include <utime.h>
19	#include "qemu-fsdev-throttle.h"
20	#include "p9array.h"
21
22	#ifdef CONFIG_LINUX
23	# include <sys/vfs.h>
24	#elif defined(CONFIG_DARWIN) \|\| defined(CONFIG_FREEBSD)
25	# include <sys/param.h>
26	# ifdef CONFIG_FREEBSD
27	# undef MACHINE /* work around some unfortunate namespace pollution */
28	# endif
29	# include <sys/mount.h>
30	#endif
31
32	#define SM_LOCAL_MODE_BITS 0600
33	#define SM_LOCAL_DIR_MODE_BITS 0700
34
35	typedef struct FsCred {
36	uid_t fc_uid;
37	gid_t fc_gid;
38	mode_t fc_mode;
39	dev_t fc_rdev;
40	} FsCred;
41
42	typedef struct FsContext FsContext;
43	typedef struct V9fsPath V9fsPath;
44
45	typedef struct ExtendedOps {
46	int (get_st_gen)(FsContext , V9fsPath , mode_t, uint64_t );
47	} ExtendedOps;
48
49	/* export flags */
50	#define V9FS_IMMEDIATE_WRITEOUT 0x00000001
51	#define V9FS_PATHNAME_FSCONTEXT 0x00000002
52	/*
53	* uid/gid set on fileserver files
54	*/
55	#define V9FS_SM_PASSTHROUGH 0x00000004
56	/*
57	* uid/gid part of xattr
58	*/
59	#define V9FS_SM_MAPPED 0x00000008
60	/*
61	* Server will try to set uid/gid.
62	* On failure ignore the error.
63	*/
64	#define V9FS_SM_NONE 0x00000010
65	/*
66	* uid/gid part of .virtfs_meatadata namespace
67	*/
68	#define V9FS_SM_MAPPED_FILE 0x00000020
69	#define V9FS_RDONLY 0x00000040
70	#define V9FS_PROXY_SOCK_FD 0x00000080
71	#define V9FS_PROXY_SOCK_NAME 0x00000100
72	/*
73	* multidevs option (either one of the two applies exclusively)
74	*/
75	#define V9FS_REMAP_INODES 0x00000200
76	#define V9FS_FORBID_MULTIDEVS 0x00000400
77	/*
78	* Disables certain performance warnings from being logged on host side.
79	*/
80	#define V9FS_NO_PERF_WARN 0x00000800
81
82	#define V9FS_SEC_MASK 0x0000003C
83
84	/*
85	* Limits the maximum amount of simultaneously open xattr FIDs to prevent
86	* host memory exhaustion (as each xattr FID contains a xattr value buffer).
87	*/
88	#define V9FS_MAX_XATTR_DEFAULT 1024
89
90	typedef struct FileOperations FileOperations;
91	typedef struct XattrOperations XattrOperations;
92
93	/*
94	* Structure to store the various fsdev's passed through command line.
95	*/
96	typedef struct FsDriverEntry {
97	char *fsdev_id;
98	char *path;
99	int export_flags;
100	FileOperations *ops;
101	FsThrottle fst;
102	mode_t fmode;
103	mode_t dmode;
104	/* temporary storage for parse_opts only */
105	uint32_t max_xattr;
106	} FsDriverEntry;
107
108	struct FsContext {
109	uid_t uid;
110	char *fs_root;
111	int export_flags;
112	XattrOperations **xops;
113	ExtendedOps exops;
114	FsThrottle *fst;
115	/* fs driver specific data */
116	void *private;
117	mode_t fmode;
118	mode_t dmode;
119	/* max. amount of simultaneously open xattr FIDs */
120	uint32_t xattr_fid_limit;
121	/* current amount of open xattr FIDs */
122	uint32_t xattr_fid_count;
123	};
124
125	struct V9fsPath {
126	size_t size;
127	char *data;
128	};
129	P9ARRAY_DECLARE_TYPE(V9fsPath);
130
131	typedef union V9fsFidOpenState V9fsFidOpenState;
132
133	void cred_init(FsCred *);
134
135	struct FileOperations {
136	int (parse_opts)(QemuOpts , FsDriverEntry , Error *errp);
137	int (init)(FsContext , Error **errp);
138	void (cleanup)(FsContext );
139	int (lstat)(FsContext , V9fsPath , struct stat );
140	ssize_t (readlink)(FsContext , V9fsPath , char , size_t);
141	int (chmod)(FsContext , V9fsPath , FsCred );
142	int (chown)(FsContext , V9fsPath , FsCred );
143	int (mknod)(FsContext , V9fsPath , const char , FsCred *);
144	int (utimensat)(FsContext , V9fsPath , const struct timespec );
145	int (futimens)(FsContext ctx, int fid_type, V9fsFidOpenState *fs,
146	const struct timespec *times);
147	int (remove)(FsContext , const char *);
148	int (symlink)(FsContext , const char , V9fsPath ,
149	const char , FsCred );
150	int (link)(FsContext , V9fsPath , V9fsPath , const char *);
151	int (setuid)(FsContext , uid_t);
152	int (close)(FsContext , V9fsFidOpenState *);
153	int (closedir)(FsContext , V9fsFidOpenState *);
154	int (opendir)(FsContext , V9fsPath , V9fsFidOpenState );
155	int (open)(FsContext , V9fsPath , int, V9fsFidOpenState );
156	int (open2)(FsContext , V9fsPath , const char ,
157	int, FsCred , V9fsFidOpenState );
158	void (rewinddir)(FsContext , V9fsFidOpenState *);
159	off_t (telldir)(FsContext , V9fsFidOpenState *);
160	struct dirent * (readdir)(FsContext , V9fsFidOpenState *);
161	void (seekdir)(FsContext , V9fsFidOpenState *, off_t);
162	ssize_t (preadv)(FsContext , V9fsFidOpenState *,
163	const struct iovec *, int, off_t);
164	ssize_t (pwritev)(FsContext , V9fsFidOpenState *,
165	const struct iovec *, int, off_t);
166	int (mkdir)(FsContext , V9fsPath , const char , FsCred *);
167	int (fstat)(FsContext , int, V9fsFidOpenState , struct stat );
168	int (rename)(FsContext , const char , const char );
169	int (truncate)(FsContext , V9fsPath *, off_t);
170	int (ftruncate)(FsContext ctx, int fid_type, V9fsFidOpenState *fs,
171	off_t size);
172	int (fsync)(FsContext , int, V9fsFidOpenState *, int);
173	int (statfs)(FsContext s, V9fsPath path, struct statfs stbuf);
174	ssize_t (lgetxattr)(FsContext , V9fsPath *,
175	const char , void , size_t);
176	ssize_t (llistxattr)(FsContext , V9fsPath , void , size_t);
177	int (lsetxattr)(FsContext , V9fsPath *,
178	const char , void , size_t, int);
179	int (lremovexattr)(FsContext , V9fsPath , const char );
180	int (name_to_path)(FsContext , V9fsPath , const char , V9fsPath *);
181	int (renameat)(FsContext ctx, V9fsPath olddir, const char old_name,
182	V9fsPath newdir, const char new_name);
183	int (unlinkat)(FsContext ctx, V9fsPath dir, const char name, int flags);
184	bool (has_valid_file_handle)(int fid_type, V9fsFidOpenState fs);
185	};
186
187	#endif