fsdev/file-op-9p.h

   1 /*
   2  * Virtio 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 #ifndef _FILEOP_H
  14 #define _FILEOP_H
  15 #include <sys/types.h>
  16 #include <dirent.h>
  17 #include <sys/time.h>
  18 #include <utime.h>
  19 #include <sys/stat.h>
  20 #include <sys/uio.h>
  21 #include <sys/vfs.h>
  22 #define SM_LOCAL_MODE_BITS    0600
  23 #define SM_LOCAL_DIR_MODE_BITS    0700
  24
  25 typedef enum
  26 {
  27     /*
  28      * Server will try to set uid/gid.
  29      * On failure ignore the error.
  30      */
  31     SM_NONE = 0,
  32     /*
  33      * uid/gid set on fileserver files
  34      */
  35     SM_PASSTHROUGH = 1,
  36     /*
  37      * uid/gid part of xattr
  38      */
  39     SM_MAPPED,
  40 } SecModel;
  41
  42 typedef struct FsCred
  43 {
  44     uid_t   fc_uid;
  45     gid_t   fc_gid;
  46     mode_t  fc_mode;
  47     dev_t   fc_rdev;
  48 } FsCred;
  49
  50 struct xattr_operations;
  51
  52 typedef struct FsContext
  53 {
  54     char *fs_root;
  55     SecModel fs_sm;
  56     uid_t uid;
  57     struct xattr_operations **xops;
  58 } FsContext;
  59
  60 void cred_init(FsCred *);
  61
  62 typedef struct FileOperations
  63 {
  64     int (*lstat)(FsContext *, const char *, struct stat *);
  65     ssize_t (*readlink)(FsContext *, const char *, char *, size_t);
  66     int (*chmod)(FsContext *, const char *, FsCred *);
  67     int (*chown)(FsContext *, const char *, FsCred *);
  68     int (*mknod)(FsContext *, const char *, FsCred *);
  69     int (*utimensat)(FsContext *, const char *, const struct timespec *);
  70     int (*remove)(FsContext *, const char *);
  71     int (*symlink)(FsContext *, const char *, const char *, FsCred *);
  72     int (*link)(FsContext *, const char *, const char *);
  73     int (*setuid)(FsContext *, uid_t);
  74     int (*close)(FsContext *, int);
  75     int (*closedir)(FsContext *, DIR *);
  76     DIR *(*opendir)(FsContext *, const char *);
  77     int (*open)(FsContext *, const char *, int);
  78     int (*open2)(FsContext *, const char *, int, FsCred *);
  79     void (*rewinddir)(FsContext *, DIR *);
  80     off_t (*telldir)(FsContext *, DIR *);
  81     struct dirent *(*readdir)(FsContext *, DIR *);
  82     void (*seekdir)(FsContext *, DIR *, off_t);
  83     ssize_t (*preadv)(FsContext *, int, const struct iovec *, int, off_t);
  84     ssize_t (*pwritev)(FsContext *, int, const struct iovec *, int, off_t);
  85     int (*mkdir)(FsContext *, const char *, FsCred *);
  86     int (*fstat)(FsContext *, int, struct stat *);
  87     int (*rename)(FsContext *, const char *, const char *);
  88     int (*truncate)(FsContext *, const char *, off_t);
  89     int (*fsync)(FsContext *, int, int);
  90     int (*statfs)(FsContext *s, const char *path, struct statfs *stbuf);
  91     ssize_t (*lgetxattr)(FsContext *, const char *,
  92                          const char *, void *, size_t);
  93     ssize_t (*llistxattr)(FsContext *, const char *, void *, size_t);
  94     int (*lsetxattr)(FsContext *, const char *,
  95                      const char *, void *, size_t, int);
  96     int (*lremovexattr)(FsContext *, const char *, const char *);
  97     void *opaque;
  98 } FileOperations;
  99
 100 static inline const char *rpath(FsContext *ctx, const char *path)
 101 {
 102     /* FIXME: so wrong... */
 103     static char buffer[4096];
 104     snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
 105     return buffer;
 106 }
 107 #endif