squashfuse_dlopen.h

   1 #ifndef SQFS_DLOPEN_H
   2 #define SQFS_DLOPEN_H
   3
   4 //#define ENABLE_DLOPEN
   5
   6 #ifdef ENABLE_DLOPEN
   7
   8 #include <dlfcn.h>
   9
  10 #include <time.h>
  11 #include <utime.h>
  12 #include <fcntl.h>
  13 #include <inttypes.h>
  14 #include <stdlib.h>
  15 #include <stdio.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <sys/statvfs.h>
  19 #include <sys/uio.h>
  20
  21
  22 /*** dlopen() stuff ***/
  23
  24 #define LIBNAME "libfuse.so.2"
  25
  26 void *libhandle;
  27 int have_libloaded;
  28 const char *load_library_errmsg;
  29
  30 #define LOAD_LIBRARY \
  31 if (have_libloaded != 1) { \
  32   if (!(libhandle = dlopen(LIBNAME, RTLD_LAZY))) { \
  33     fprintf(stderr, "dlopen(): error loading " LIBNAME "\n\n%s", load_library_errmsg ); \
  34     exit(1); \
  35   } else { \
  36     have_libloaded = 1; \
  37   } \
  38 }
  39
  40 #define STRINGIFY(x) #x
  41
  42 #define LOAD_SYMBOL(type,x,param) \
  43 type (*dl_##x) param; \
  44 *(void **) (&dl_##x) = dlsym(libhandle, STRINGIFY(x)); \
  45 if (dlerror()) { \
  46   fprintf(stderr, "dlsym(): error loading symbol from " LIBNAME "\n\n%s", load_library_errmsg ); \
  47   CLOSE_LIBRARY; \
  48   exit(1); \
  49 }
  50
  51 #define DL(x) dl_##x
  52 #define CLOSE_LIBRARY dlclose(libhandle);
  53
  54
  55 /*** libfuse stuff ***/
  56
  57 #define FUSE_ROOT_ID 1
  58 #define FUSE_ARGS_INIT(argc, argv) { argc, argv, 0 }
  59 #define FUSE_OPT_KEY(templ, key) { templ, -1U, key }
  60 #define FUSE_OPT_KEY_OPT -1
  61 #define FUSE_OPT_KEY_NONOPT -2
  62 #define FUSE_OPT_END { NULL, 0, 0 }
  63
  64 enum fuse_buf_flags {
  65   FUSE_BUF_IS_FD                = (1 << 1),
  66   FUSE_BUF_FD_SEEK      = (1 << 2),
  67   FUSE_BUF_FD_RETRY     = (1 << 3),
  68 };
  69
  70 typedef unsigned long fuse_ino_t;
  71 typedef struct fuse_req *fuse_req_t;
  72
  73 struct fuse_chan;
  74 struct fuse_pollhandle;
  75
  76 struct fuse_args {
  77   int argc;
  78   char **argv;
  79   int allocated;
  80 };
  81
  82 typedef int (*fuse_fill_dir_t) (void *buf, const char *name, const struct stat *stbuf, off_t off);
  83 typedef int (*fuse_opt_proc_t)(void *data, const char *arg, int key, struct fuse_args *outargs);
  84 typedef struct fuse_dirhandle *fuse_dirh_t;
  85 typedef int (*fuse_dirfil_t) (fuse_dirh_t h, const char *name, int type, ino_t ino);
  86
  87 struct fuse_file_info {
  88   int flags;
  89   unsigned long fh_old;
  90   int writepage;
  91   unsigned int direct_io : 1;
  92   unsigned int keep_cache : 1;
  93   unsigned int flush : 1;
  94   unsigned int nonseekable : 1;
  95   unsigned int flock_release : 1;
  96   unsigned int padding : 27;
  97   uint64_t fh;
  98   uint64_t lock_owner;
  99 };
 100
 101 struct fuse_entry_param {
 102   fuse_ino_t ino;
 103   unsigned long generation;
 104   struct stat attr;
 105   double attr_timeout;
 106   double entry_timeout;
 107 };
 108
 109 struct fuse_opt {
 110   const char *templ;
 111   unsigned long offset;
 112   int value;
 113 };
 114
 115 struct fuse_forget_data {
 116   uint64_t ino;
 117   uint64_t nlookup;
 118 };
 119
 120 struct fuse_conn_info {
 121   unsigned proto_major;
 122   unsigned proto_minor;
 123   unsigned async_read;
 124   unsigned max_write;
 125   unsigned max_readahead;
 126   unsigned capable;
 127   unsigned want;
 128   unsigned max_background;
 129   unsigned congestion_threshold;
 130   unsigned reserved[23];
 131 };
 132
 133 struct fuse_buf {
 134   size_t size;
 135   enum fuse_buf_flags flags;
 136   void *mem;
 137   int fd;
 138   off_t pos;
 139 };
 140
 141 struct fuse_bufvec {
 142   size_t count;
 143   size_t idx;
 144   size_t off;
 145   struct fuse_buf buf[1];
 146 };
 147
 148 struct fuse_context {
 149   struct fuse *fuse;
 150   uid_t uid;
 151   gid_t gid;
 152   pid_t pid;
 153   void *private_data;
 154   mode_t umask;
 155 };
 156
 157 struct fuse_operations {
 158         int (*getattr) (const char *, struct stat *);
 159         int (*readlink) (const char *, char *, size_t);
 160         int (*getdir) (const char *, fuse_dirh_t, fuse_dirfil_t);
 161         int (*mknod) (const char *, mode_t, dev_t);
 162         int (*mkdir) (const char *, mode_t);
 163         int (*unlink) (const char *);
 164         int (*rmdir) (const char *);
 165         int (*symlink) (const char *, const char *);
 166         int (*rename) (const char *, const char *);
 167         int (*link) (const char *, const char *);
 168         int (*chmod) (const char *, mode_t);
 169         int (*chown) (const char *, uid_t, gid_t);
 170         int (*truncate) (const char *, off_t);
 171         int (*utime) (const char *, struct utimbuf *);
 172         int (*open) (const char *, struct fuse_file_info *);
 173         int (*read) (const char *, char *, size_t, off_t, struct fuse_file_info *);
 174         int (*write) (const char *, const char *, size_t, off_t, struct fuse_file_info *);
 175         int (*statfs) (const char *, struct statvfs *);
 176         int (*flush) (const char *, struct fuse_file_info *);
 177         int (*release) (const char *, struct fuse_file_info *);
 178         int (*fsync) (const char *, int, struct fuse_file_info *);
 179         int (*setxattr) (const char *, const char *, const char *, size_t, int);
 180         int (*getxattr) (const char *, const char *, char *, size_t);
 181         int (*listxattr) (const char *, char *, size_t);
 182         int (*removexattr) (const char *, const char *);
 183         int (*opendir) (const char *, struct fuse_file_info *);
 184         int (*readdir) (const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *);
 185         int (*releasedir) (const char *, struct fuse_file_info *);
 186         int (*fsyncdir) (const char *, int, struct fuse_file_info *);
 187         void *(*init) (struct fuse_conn_info *conn);
 188         void (*destroy) (void *);
 189         int (*access) (const char *, int);
 190         int (*create) (const char *, mode_t, struct fuse_file_info *);
 191         int (*ftruncate) (const char *, off_t, struct fuse_file_info *);
 192         int (*fgetattr) (const char *, struct stat *, struct fuse_file_info *);
 193         int (*lock) (const char *, struct fuse_file_info *, int cmd, struct flock *);
 194         int (*utimens) (const char *, const struct timespec tv[2]);
 195         int (*bmap) (const char *, size_t blocksize, uint64_t *idx);
 196         unsigned int flag_nullpath_ok:1;
 197         unsigned int flag_nopath:1;
 198         unsigned int flag_utime_omit_ok:1;
 199         unsigned int flag_reserved:29;
 200         int (*ioctl) (const char *, int cmd, void *arg, struct fuse_file_info *, unsigned int flags, void *data);
 201         int (*poll) (const char *, struct fuse_file_info *, struct fuse_pollhandle *ph, unsigned *reventsp);
 202         int (*write_buf) (const char *, struct fuse_bufvec *buf, off_t off, struct fuse_file_info *);
 203         int (*read_buf) (const char *, struct fuse_bufvec **bufp, size_t size, off_t off, struct fuse_file_info *);
 204         int (*flock) (const char *, struct fuse_file_info *, int op);
 205         int (*fallocate) (const char *, int, off_t, off_t, struct fuse_file_info *);
 206 };
 207
 208 struct fuse_lowlevel_ops {
 209   void (*init) (void *userdata, struct fuse_conn_info *conn);
 210   void (*destroy) (void *userdata);
 211   void (*lookup) (fuse_req_t req, fuse_ino_t parent, const char *name);
 212   void (*forget) (fuse_req_t req, fuse_ino_t ino, unsigned long nlookup);
 213   void (*getattr) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi);
 214   void (*setattr) (fuse_req_t req, fuse_ino_t ino, struct stat *attr, int to_set, struct fuse_file_info *fi);
 215   void (*readlink) (fuse_req_t req, fuse_ino_t ino);
 216   void (*mknod) (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, dev_t rdev);
 217   void (*mkdir) (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode);
 218   void (*unlink) (fuse_req_t req, fuse_ino_t parent, const char *name);
 219   void (*rmdir) (fuse_req_t req, fuse_ino_t parent, const char *name);
 220   void (*symlink) (fuse_req_t req, const char *link, fuse_ino_t parent, const char *name);
 221   void (*rename) (fuse_req_t req, fuse_ino_t parent, const char *name, fuse_ino_t newparent, const char *newname);
 222   void (*link) (fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent, const char *newname);
 223   void (*open) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi);
 224   void (*read) (fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *fi);
 225   void (*write) (fuse_req_t req, fuse_ino_t ino, const char *buf, size_t size, off_t off, struct fuse_file_info *fi);
 226   void (*flush) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi);
 227   void (*release) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi);
 228   void (*fsync) (fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *fi);
 229   void (*opendir) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi);
 230   void (*readdir) (fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *fi);
 231   void (*releasedir) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi);
 232   void (*fsyncdir) (fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *fi);
 233   void (*statfs) (fuse_req_t req, fuse_ino_t ino);
 234   void (*setxattr) (fuse_req_t req, fuse_ino_t ino, const char *name, const char *value, size_t size, int flags);
 235   void (*getxattr) (fuse_req_t req, fuse_ino_t ino, const char *name, size_t size);
 236   void (*listxattr) (fuse_req_t req, fuse_ino_t ino, size_t size);
 237   void (*removexattr) (fuse_req_t req, fuse_ino_t ino, const char *name);
 238   void (*access) (fuse_req_t req, fuse_ino_t ino, int mask);
 239   void (*create) (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, struct fuse_file_info *fi);
 240   void (*getlk) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock);
 241   void (*setlk) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock, int sleep);
 242   void (*bmap) (fuse_req_t req, fuse_ino_t ino, size_t blocksize, uint64_t idx);
 243   void (*ioctl) (fuse_req_t req, fuse_ino_t ino, int cmd, void *arg, struct fuse_file_info *fi, unsigned flags, const void *in_buf, size_t in_bufsz, size_t out_bufsz);
 244   void (*poll) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct fuse_pollhandle *ph);
 245   void (*write_buf) (fuse_req_t req, fuse_ino_t ino, struct fuse_bufvec *bufv, off_t off, struct fuse_file_info *fi);
 246   void (*retrieve_reply) (fuse_req_t req, void *cookie, fuse_ino_t ino, off_t offset, struct fuse_bufvec *bufv);
 247   void (*forget_multi) (fuse_req_t req, size_t count, struct fuse_forget_data *forgets);
 248   void (*flock) (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, int op);
 249   void (*fallocate) (fuse_req_t req, fuse_ino_t ino, int mode, off_t offset, off_t length, struct fuse_file_info *fi);
 250 };
 251
 252 #else  /* !ENABLE_DLOPEN */
 253
 254 #define LOAD_LIBRARY
 255 #define LOAD_SYMBOL(x)
 256 #define DL(x)
 257 #define CLOSE_LIBRARY
 258
 259 #endif  /* !ENABLE_DLOPEN */
 260
 261 #endif /* SQFS_DLOPEN_H */
 262