985d575ac1cbfc8867104c146ad94bce3e3c00b0
1 /* $Id$ */
3 /***
4 This file is part of fusedav.
6 fusedav is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 fusedav is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
16 You should have received a copy of the GNU General Public License
17 along with fusedav; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 ***/
21 #ifdef HAVE_CONFIG_H
22 #include <config.h>
23 #endif
25 #define _XOPEN_SOURCE 500
27 #include <errno.h>
28 #include <string.h>
29 #include <limits.h>
30 #include <fcntl.h>
31 #include <stdlib.h>
32 #include <unistd.h>
33 #include <assert.h>
34 #include <pthread.h>
36 #include <ne_props.h>
37 #include <ne_uri.h>
38 #include <ne_session.h>
39 #include <ne_utils.h>
40 #include <ne_socket.h>
41 #include <ne_auth.h>
42 #include <ne_dates.h>
43 #include <ne_basic.h>
45 #include "filecache.h"
46 #include "fusedav.h"
47 #include "session.h"
48 #include "statcache.h"
50 struct file_info {
51 char *filename;
52 int fd;
53 off_t server_length, length, present;
55 int readable;
56 int writable;
58 int modified;
60 int ref, dead;
62 pthread_mutex_t mutex;
64 /* This field is locked by files_mutex, not by file_info->mutex */
65 struct file_info *next;
66 };
68 static struct file_info *files = NULL;
69 static pthread_mutex_t files_mutex = PTHREAD_MUTEX_INITIALIZER;
71 int file_cache_sync_unlocked(struct file_info *fi);
73 void* file_cache_get(const char *path) {
74 struct file_info *f, *r = NULL;
76 pthread_mutex_lock(&files_mutex);
78 for (f = files; f; f = f->next) {
80 pthread_mutex_lock(&f->mutex);
81 if (!f->dead && f->filename && !strcmp(path, f->filename)) {
82 f->ref++;
83 r = f;
84 }
85 pthread_mutex_unlock(&f->mutex);
87 if (r)
88 break;
89 }
91 pthread_mutex_unlock(&files_mutex);
92 return f;
93 }
95 static void file_cache_free_unlocked(struct file_info *fi) {
96 assert(fi && fi->dead && fi->ref == 0);
98 free(fi->filename);
100 if (fi->fd >= 0)
101 close(fi->fd);
103 pthread_mutex_destroy(&fi->mutex);
104 free(fi);
105 }
107 void file_cache_unref(void *f) {
108 struct file_info *fi = f;
109 assert(fi);
111 pthread_mutex_lock(&fi->mutex);
113 assert(fi->ref >= 1);
114 fi->ref--;
116 if (!fi->ref && fi->dead) {
117 file_cache_sync_unlocked(fi);
118 file_cache_free_unlocked(fi);
119 }
121 pthread_mutex_unlock(&fi->mutex);
122 }
124 static void file_cache_unlink(struct file_info *fi) {
125 struct file_info *s, *prev;
126 assert(fi);
128 pthread_mutex_lock(&files_mutex);
130 for (s = files, prev = NULL; s; s = s->next) {
131 if (s == fi) {
132 if (prev)
133 prev->next = s->next;
134 else
135 files = s->next;
137 break;
138 }
140 prev = s;
141 }
143 pthread_mutex_unlock(&files_mutex);
144 }
146 int file_cache_close(void *f) {
147 struct file_info *fi = f;
148 int r = 0;
149 assert(fi);
151 file_cache_unlink(f);
153 pthread_mutex_lock(&fi->mutex);
154 fi->dead = 1;
155 pthread_mutex_unlock(&fi->mutex);
157 return r;
158 }
160 void* file_cache_open(const char *path, int flags) {
161 struct file_info *fi;
162 char tempfile[PATH_MAX];
163 char *length = NULL;
164 ne_request *req = NULL;
165 ne_session *session;
167 if ((fi = file_cache_get(path))) {
168 if (flags & O_RDONLY || flags & O_RDWR) fi->readable = 1;
169 if (flags & O_WRONLY || flags & O_RDWR) fi->writable = 1;
170 return fi;
171 }
173 if (!(session = session_get())) {
174 errno = -EIO;
175 return NULL;
176 }
178 fi = malloc(sizeof(struct file_info));
179 memset(fi, 0, sizeof(struct file_info));
180 fi->fd = -1;
182 fi->filename = strdup(path);
184 snprintf(tempfile, sizeof(tempfile), "%s/fusedav-cache-XXXXXX", "/tmp");
185 if ((fi->fd = mkstemp(tempfile)) < 0)
186 goto fail;
187 unlink(tempfile);
189 req = ne_request_create(session, "HEAD", path);
190 assert(req);
192 ne_add_response_header_handler(req, "Content-Length", ne_duplicate_header, &length);
194 if (ne_request_dispatch(req) != NE_OK) {
195 fprintf(stderr, "HEAD failed: %s\n", ne_get_error(session));
196 errno = ENOENT;
197 goto fail;
198 }
200 if (!length) {
201 fprintf(stderr, "HEAD did not return content length.\n");
202 errno = EPROTO;
203 goto fail;
204 }
206 fi->server_length = fi->length = atoi(length);
208 ne_request_destroy(req);
209 free(length);
211 if (flags & O_RDONLY || flags & O_RDWR) fi->readable = 1;
212 if (flags & O_WRONLY || flags & O_RDWR) fi->writable = 1;
214 pthread_mutex_init(&fi->mutex, NULL);
216 pthread_mutex_lock(&files_mutex);
217 fi->next = files;
218 files = fi;
219 pthread_mutex_unlock(&files_mutex);
221 fi->ref = 1;
223 return fi;
225 fail:
227 if (req)
228 ne_request_destroy(req);
230 if (length)
231 free(length);
233 if (fi) {
234 if (fi->fd >= 0)
235 close(fi->fd);
236 free(fi->filename);
237 free(fi);
238 }
240 return NULL;
241 }
243 static int load_up_to_unlocked(struct file_info *fi, off_t l) {
244 ne_content_range range;
245 assert(fi);
246 ne_session *session;
248 if (!(session = session_get())) {
249 errno = EIO;
250 return -1;
251 }
253 if (l > fi->server_length)
254 l = fi->server_length;
256 if (l <= fi->present)
257 return 0;
259 if (lseek(fi->fd, fi->present, SEEK_SET) != fi->present)
260 return -1;
262 range.start = fi->present;
263 range.end = l-1;
265 if (ne_get_range(session, fi->filename, &range, fi->fd)) {
266 fprintf(stderr, "GET failed: %s\n", ne_get_error(session));
267 errno = ENOENT;
268 return -1;
269 }
271 fi->present = l;
272 return 0;
273 }
275 int file_cache_read(void *f, char *buf, size_t size, off_t offset) {
276 struct file_info *fi = f;
277 ssize_t r = -1;
279 assert(fi && buf && size);
281 pthread_mutex_lock(&fi->mutex);
283 if (load_up_to_unlocked(fi, offset+size) < 0)
284 goto finish;
286 if ((r = pread(fi->fd, buf, size, offset)) < 0)
287 goto finish;
289 finish:
291 pthread_mutex_unlock(&fi->mutex);
293 return r;
294 }
296 int file_cache_write(void *f, const char *buf, size_t size, off_t offset) {
297 struct file_info *fi = f;
298 ssize_t r = -1;
300 assert (fi);
302 pthread_mutex_lock(&fi->mutex);
304 if (!fi->writable) {
305 errno = EBADF;
306 goto finish;
307 }
309 if (load_up_to_unlocked(fi, offset) < 0)
310 goto finish;
312 if ((r = pwrite(fi->fd, buf, size, offset)) < 0)
313 goto finish;
315 if (offset+size > fi->present)
316 fi->present = offset+size;
318 if (offset+size > fi->length)
319 fi->length = offset+size;
321 fi->modified = 1;
323 r = 0;
325 finish:
326 pthread_mutex_unlock(&fi->mutex);
328 return r;
329 }
331 int file_cache_truncate(void *f, off_t s) {
332 struct file_info *fi = f;
333 assert(fi);
334 int r;
336 pthread_mutex_lock(&fi->mutex);
338 fi->length = s;
339 r = ftruncate(fi->fd, fi->length);
341 pthread_mutex_unlock(&fi->mutex);
343 return r;
344 }
346 int file_cache_sync_unlocked(struct file_info *fi) {
347 int r = -1;
348 ne_session *session;
349 assert(fi);
351 if (!(session = session_get())) {
352 errno = EIO;
353 goto finish;
354 }
356 if (!fi->writable) {
357 errno = EBADF;
358 goto finish;
359 }
361 if (!fi->modified) {
362 r = 0;
363 goto finish;
364 }
366 if (load_up_to_unlocked(fi, (off_t) -1) < 0)
367 goto finish;
369 if (lseek(fi->fd, 0, SEEK_SET) == (off_t)-1)
370 goto finish;
373 if (ne_put(session, fi->filename, fi->fd)) {
374 fprintf(stderr, "PUT failed: %s\n", ne_get_error(session));
375 errno = ENOENT;
376 goto finish;
377 }
379 stat_cache_invalidate(fi->filename);
380 dir_cache_invalidate_parent(fi->filename);
382 r = 0;
384 finish:
386 return r;
387 }
389 int file_cache_sync(void *f) {
390 struct file_info *fi = f;
391 int r = -1;
392 assert(fi);
394 pthread_mutex_lock(&fi->mutex);
395 r = file_cache_sync_unlocked(fi);
396 pthread_mutex_unlock(&fi->mutex);
398 return r;
399 }
401 int file_cache_close_all(void) {
402 int r = 0;
404 pthread_mutex_lock(&files_mutex);
406 while (files) {
407 struct file_info *fi = files;
409 pthread_mutex_lock(&fi->mutex);
410 fi->ref++;
411 pthread_mutex_unlock(&fi->mutex);
413 pthread_mutex_unlock(&files_mutex);
414 file_cache_close(fi);
415 file_cache_unref(fi);
416 pthread_mutex_lock(&files_mutex);
417 }
419 pthread_mutex_unlock(&files_mutex);
421 return r;
422 }