ceph/src/spdk/test/blobfs/fuse/fuse.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright (c) Intel Corporation.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "spdk/stdinc.h"
  35
  36 #define FUSE_USE_VERSION 30
  37 #include "fuse3/fuse.h"
  38 #include "fuse3/fuse_lowlevel.h"
  39
  40 #include "spdk/blobfs.h"
  41 #include "spdk/bdev.h"
  42 #include "spdk/event.h"
  43 #include "spdk/thread.h"
  44 #include "spdk/blob_bdev.h"
  45 #include "spdk/log.h"
  46
  47 struct fuse *g_fuse;
  48 char *g_bdev_name;
  49 char *g_mountpoint;
  50 pthread_t g_fuse_thread;
  51
  52 struct spdk_bs_dev *g_bs_dev;
  53 struct spdk_filesystem *g_fs;
  54 struct spdk_fs_thread_ctx *g_channel;
  55 struct spdk_file *g_file;
  56 int g_fserrno;
  57 int g_fuse_argc = 0;
  58 char **g_fuse_argv = NULL;
  59
  60 static void
  61 __call_fn(void *arg1, void *arg2)
  62 {
  63         fs_request_fn fn;
  64
  65         fn = (fs_request_fn)arg1;
  66         fn(arg2);
  67 }
  68
  69 static void
  70 __send_request(fs_request_fn fn, void *arg)
  71 {
  72         struct spdk_event *event;
  73
  74         event = spdk_event_allocate(0, __call_fn, (void *)fn, arg);
  75         spdk_event_call(event);
  76 }
  77
  78 static int
  79 spdk_fuse_getattr(const char *path, struct stat *stbuf, struct fuse_file_info *fi)
  80 {
  81         struct spdk_file_stat stat;
  82         int rc;
  83
  84         if (!strcmp(path, "/")) {
  85                 stbuf->st_mode = S_IFDIR | 0755;
  86                 stbuf->st_nlink = 2;
  87                 return 0;
  88         }
  89
  90         rc = spdk_fs_file_stat(g_fs, g_channel, path, &stat);
  91         if (rc == 0) {
  92                 stbuf->st_mode = S_IFREG | 0644;
  93                 stbuf->st_nlink = 1;
  94                 stbuf->st_size = stat.size;
  95         }
  96
  97         return rc;
  98 }
  99
 100 static int
 101 spdk_fuse_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
 102                   off_t offset, struct fuse_file_info *fi,
 103                   enum fuse_readdir_flags flags)
 104 {
 105         struct spdk_file *file;
 106         const char *filename;
 107         spdk_fs_iter iter;
 108
 109         filler(buf, ".", NULL, 0, 0);
 110         filler(buf, "..", NULL, 0, 0);
 111
 112         iter = spdk_fs_iter_first(g_fs);
 113         while (iter != NULL) {
 114                 file = spdk_fs_iter_get_file(iter);
 115                 iter = spdk_fs_iter_next(iter);
 116                 filename = spdk_file_get_name(file);
 117                 filler(buf, &filename[1], NULL, 0, 0);
 118         }
 119
 120         return 0;
 121 }
 122
 123 static int
 124 spdk_fuse_mknod(const char *path, mode_t mode, dev_t rdev)
 125 {
 126         return spdk_fs_create_file(g_fs, g_channel, path);
 127 }
 128
 129 static int
 130 spdk_fuse_unlink(const char *path)
 131 {
 132         return spdk_fs_delete_file(g_fs, g_channel, path);
 133 }
 134
 135 static int
 136 spdk_fuse_truncate(const char *path, off_t size, struct fuse_file_info *fi)
 137 {
 138         struct spdk_file *file;
 139         int rc;
 140
 141         rc = spdk_fs_open_file(g_fs, g_channel, path, 0, &file);
 142         if (rc != 0) {
 143                 return -rc;
 144         }
 145
 146         rc = spdk_file_truncate(file, g_channel, size);
 147         if (rc != 0) {
 148                 return -rc;
 149         }
 150
 151         spdk_file_close(file, g_channel);
 152
 153         return 0;
 154 }
 155
 156 static int
 157 spdk_fuse_utimens(const char *path, const struct timespec tv[2], struct fuse_file_info *fi)
 158 {
 159         return 0;
 160 }
 161
 162 static int
 163 spdk_fuse_open(const char *path, struct fuse_file_info *info)
 164 {
 165         struct spdk_file *file;
 166         int rc;
 167
 168         rc = spdk_fs_open_file(g_fs, g_channel, path, 0, &file);
 169         if (rc != 0) {
 170                 return -rc;
 171         }
 172
 173         info->fh = (uintptr_t)file;
 174         return 0;
 175 }
 176
 177 static int
 178 spdk_fuse_release(const char *path, struct fuse_file_info *info)
 179 {
 180         struct spdk_file *file = (struct spdk_file *)info->fh;
 181
 182         return spdk_file_close(file, g_channel);
 183 }
 184
 185 static int
 186 spdk_fuse_read(const char *path, char *buf, size_t len, off_t offset, struct fuse_file_info *info)
 187 {
 188         struct spdk_file *file = (struct spdk_file *)info->fh;
 189
 190         return spdk_file_read(file, g_channel, buf, offset, len);
 191 }
 192
 193 static int
 194 spdk_fuse_write(const char *path, const char *buf, size_t len, off_t offset,
 195                 struct fuse_file_info *info)
 196 {
 197         struct spdk_file *file = (struct spdk_file *)info->fh;
 198         int rc;
 199
 200         rc = spdk_file_write(file, g_channel, (void *)buf, offset, len);
 201         if (rc == 0) {
 202                 return len;
 203         } else {
 204                 return rc;
 205         }
 206 }
 207
 208 static int
 209 spdk_fuse_flush(const char *path, struct fuse_file_info *info)
 210 {
 211         return 0;
 212 }
 213
 214 static int
 215 spdk_fuse_fsync(const char *path, int datasync, struct fuse_file_info *info)
 216 {
 217         return 0;
 218 }
 219
 220 static int
 221 spdk_fuse_rename(const char *old_path, const char *new_path, unsigned int flags)
 222 {
 223         return spdk_fs_rename_file(g_fs, g_channel, old_path, new_path);
 224 }
 225
 226 static struct fuse_operations spdk_fuse_oper = {
 227         .getattr        = spdk_fuse_getattr,
 228         .readdir        = spdk_fuse_readdir,
 229         .mknod          = spdk_fuse_mknod,
 230         .unlink         = spdk_fuse_unlink,
 231         .truncate       = spdk_fuse_truncate,
 232         .utimens        = spdk_fuse_utimens,
 233         .open           = spdk_fuse_open,
 234         .release        = spdk_fuse_release,
 235         .read           = spdk_fuse_read,
 236         .write          = spdk_fuse_write,
 237         .flush          = spdk_fuse_flush,
 238         .fsync          = spdk_fuse_fsync,
 239         .rename         = spdk_fuse_rename,
 240 };
 241
 242 static void
 243 construct_targets(void)
 244 {
 245         struct spdk_bdev *bdev;
 246
 247         bdev = spdk_bdev_get_by_name(g_bdev_name);
 248         if (bdev == NULL) {
 249                 SPDK_ERRLOG("bdev %s not found\n", g_bdev_name);
 250                 exit(1);
 251         }
 252
 253         g_bs_dev = spdk_bdev_create_bs_dev(bdev, NULL, NULL);
 254
 255         printf("Mounting BlobFS on bdev %s\n", spdk_bdev_get_name(bdev));
 256 }
 257
 258 static void
 259 start_fuse_fn(void *arg1, void *arg2)
 260 {
 261         struct fuse_args args = FUSE_ARGS_INIT(g_fuse_argc, g_fuse_argv);
 262         int rc;
 263         struct fuse_cmdline_opts opts = {};
 264
 265         g_fuse_thread = pthread_self();
 266         rc = fuse_parse_cmdline(&args, &opts);
 267         if (rc != 0) {
 268                 spdk_app_stop(-1);
 269                 fuse_opt_free_args(&args);
 270                 return;
 271         }
 272         g_fuse = fuse_new(&args, &spdk_fuse_oper, sizeof(spdk_fuse_oper), NULL);
 273         fuse_opt_free_args(&args);
 274
 275         rc = fuse_mount(g_fuse, g_mountpoint);
 276         if (rc != 0) {
 277                 spdk_app_stop(-1);
 278                 return;
 279         }
 280
 281         fuse_daemonize(true /* true = run in foreground */);
 282
 283         fuse_loop(g_fuse);
 284
 285         fuse_unmount(g_fuse);
 286         fuse_destroy(g_fuse);
 287 }
 288
 289 static void
 290 init_cb(void *ctx, struct spdk_filesystem *fs, int fserrno)
 291 {
 292         struct spdk_event *event;
 293
 294         g_fs = fs;
 295         g_channel = spdk_fs_alloc_thread_ctx(g_fs);
 296         event = spdk_event_allocate(1, start_fuse_fn, NULL, NULL);
 297         spdk_event_call(event);
 298 }
 299
 300 static void
 301 spdk_fuse_run(void *arg1)
 302 {
 303         construct_targets();
 304         spdk_fs_load(g_bs_dev, __send_request, init_cb, NULL);
 305 }
 306
 307 static void
 308 shutdown_cb(void *ctx, int fserrno)
 309 {
 310         fuse_session_exit(fuse_get_session(g_fuse));
 311         pthread_kill(g_fuse_thread, SIGINT);
 312         spdk_fs_free_thread_ctx(g_channel);
 313         spdk_app_stop(0);
 314 }
 315
 316 static void
 317 spdk_fuse_shutdown(void)
 318 {
 319         spdk_fs_unload(g_fs, shutdown_cb, NULL);
 320 }
 321
 322 int main(int argc, char **argv)
 323 {
 324         struct spdk_app_opts opts = {};
 325         int rc = 0;
 326
 327         if (argc < 4) {
 328                 fprintf(stderr, "usage: %s <conffile> <bdev name> <mountpoint>\n", argv[0]);
 329                 exit(1);
 330         }
 331
 332         spdk_app_opts_init(&opts);
 333         opts.name = "spdk_fuse";
 334         opts.config_file = argv[1];
 335         opts.reactor_mask = "0x3";
 336         opts.shutdown_cb = spdk_fuse_shutdown;
 337
 338         g_bdev_name = argv[2];
 339         g_mountpoint = argv[3];
 340         g_fuse_argc = argc - 2;
 341         g_fuse_argv = &argv[2];
 342
 343         rc = spdk_app_start(&opts, spdk_fuse_run, NULL);
 344         spdk_app_fini();
 345
 346         return rc;
 347 }