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TOMOYO Linux Cross Reference
Linux/fs/hppfs/hppfs.c

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  1 /*
  2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3  * Licensed under the GPL
  4  */
  5 
  6 #include <linux/ctype.h>
  7 #include <linux/dcache.h>
  8 #include <linux/file.h>
  9 #include <linux/fs.h>
 10 #include <linux/init.h>
 11 #include <linux/kernel.h>
 12 #include <linux/list.h>
 13 #include <linux/module.h>
 14 #include <linux/mount.h>
 15 #include <linux/slab.h>
 16 #include <linux/statfs.h>
 17 #include <linux/types.h>
 18 #include <linux/pid_namespace.h>
 19 #include <linux/namei.h>
 20 #include <asm/uaccess.h>
 21 #include <os.h>
 22 
 23 static struct inode *get_inode(struct super_block *, struct dentry *);
 24 
 25 struct hppfs_data {
 26         struct list_head list;
 27         char contents[PAGE_SIZE - sizeof(struct list_head)];
 28 };
 29 
 30 struct hppfs_private {
 31         struct file *proc_file;
 32         int host_fd;
 33         loff_t len;
 34         struct hppfs_data *contents;
 35 };
 36 
 37 struct hppfs_inode_info {
 38         struct dentry *proc_dentry;
 39         struct inode vfs_inode;
 40 };
 41 
 42 static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
 43 {
 44         return container_of(inode, struct hppfs_inode_info, vfs_inode);
 45 }
 46 
 47 #define HPPFS_SUPER_MAGIC 0xb00000ee
 48 
 49 static const struct super_operations hppfs_sbops;
 50 
 51 static int is_pid(struct dentry *dentry)
 52 {
 53         struct super_block *sb;
 54         int i;
 55 
 56         sb = dentry->d_sb;
 57         if (dentry->d_parent != sb->s_root)
 58                 return 0;
 59 
 60         for (i = 0; i < dentry->d_name.len; i++) {
 61                 if (!isdigit(dentry->d_name.name[i]))
 62                         return 0;
 63         }
 64         return 1;
 65 }
 66 
 67 static char *dentry_name(struct dentry *dentry, int extra)
 68 {
 69         struct dentry *parent;
 70         char *root, *name;
 71         const char *seg_name;
 72         int len, seg_len, root_len;
 73 
 74         len = 0;
 75         parent = dentry;
 76         while (parent->d_parent != parent) {
 77                 if (is_pid(parent))
 78                         len += strlen("pid") + 1;
 79                 else len += parent->d_name.len + 1;
 80                 parent = parent->d_parent;
 81         }
 82 
 83         root = "proc";
 84         root_len = strlen(root);
 85         len += root_len;
 86         name = kmalloc(len + extra + 1, GFP_KERNEL);
 87         if (name == NULL)
 88                 return NULL;
 89 
 90         name[len] = '\0';
 91         parent = dentry;
 92         while (parent->d_parent != parent) {
 93                 if (is_pid(parent)) {
 94                         seg_name = "pid";
 95                         seg_len = strlen(seg_name);
 96                 }
 97                 else {
 98                         seg_name = parent->d_name.name;
 99                         seg_len = parent->d_name.len;
100                 }
101 
102                 len -= seg_len + 1;
103                 name[len] = '/';
104                 memcpy(&name[len + 1], seg_name, seg_len);
105                 parent = parent->d_parent;
106         }
107         memcpy(name, root, root_len);
108         return name;
109 }
110 
111 static int file_removed(struct dentry *dentry, const char *file)
112 {
113         char *host_file;
114         int extra, fd;
115 
116         extra = 0;
117         if (file != NULL)
118                 extra += strlen(file) + 1;
119 
120         host_file = dentry_name(dentry, extra + strlen("/remove"));
121         if (host_file == NULL) {
122                 printk(KERN_ERR "file_removed : allocation failed\n");
123                 return -ENOMEM;
124         }
125 
126         if (file != NULL) {
127                 strcat(host_file, "/");
128                 strcat(host_file, file);
129         }
130         strcat(host_file, "/remove");
131 
132         fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
133         kfree(host_file);
134         if (fd > 0) {
135                 os_close_file(fd);
136                 return 1;
137         }
138         return 0;
139 }
140 
141 static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
142                                    unsigned int flags)
143 {
144         struct dentry *proc_dentry, *parent;
145         struct qstr *name = &dentry->d_name;
146         struct inode *inode;
147         int err, deleted;
148 
149         deleted = file_removed(dentry, NULL);
150         if (deleted < 0)
151                 return ERR_PTR(deleted);
152         else if (deleted)
153                 return ERR_PTR(-ENOENT);
154 
155         parent = HPPFS_I(ino)->proc_dentry;
156         mutex_lock(&parent->d_inode->i_mutex);
157         proc_dentry = lookup_one_len(name->name, parent, name->len);
158         mutex_unlock(&parent->d_inode->i_mutex);
159 
160         if (IS_ERR(proc_dentry))
161                 return proc_dentry;
162 
163         err = -ENOMEM;
164         inode = get_inode(ino->i_sb, proc_dentry);
165         if (!inode)
166                 goto out;
167 
168         d_add(dentry, inode);
169         return NULL;
170 
171  out:
172         return ERR_PTR(err);
173 }
174 
175 static const struct inode_operations hppfs_file_iops = {
176 };
177 
178 static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
179                          loff_t *ppos, int is_user)
180 {
181         ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
182         ssize_t n;
183 
184         read = file_inode(file)->i_fop->read;
185 
186         if (!is_user)
187                 set_fs(KERNEL_DS);
188 
189         n = (*read)(file, buf, count, &file->f_pos);
190 
191         if (!is_user)
192                 set_fs(USER_DS);
193 
194         if (ppos)
195                 *ppos = file->f_pos;
196         return n;
197 }
198 
199 static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
200 {
201         ssize_t n;
202         int cur, err;
203         char *new_buf;
204 
205         n = -ENOMEM;
206         new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
207         if (new_buf == NULL) {
208                 printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
209                 goto out;
210         }
211         n = 0;
212         while (count > 0) {
213                 cur = min_t(ssize_t, count, PAGE_SIZE);
214                 err = os_read_file(fd, new_buf, cur);
215                 if (err < 0) {
216                         printk(KERN_ERR "hppfs_read : read failed, "
217                                "errno = %d\n", err);
218                         n = err;
219                         goto out_free;
220                 } else if (err == 0)
221                         break;
222 
223                 if (copy_to_user(buf, new_buf, err)) {
224                         n = -EFAULT;
225                         goto out_free;
226                 }
227                 n += err;
228                 count -= err;
229         }
230  out_free:
231         kfree(new_buf);
232  out:
233         return n;
234 }
235 
236 static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
237                           loff_t *ppos)
238 {
239         struct hppfs_private *hppfs = file->private_data;
240         struct hppfs_data *data;
241         loff_t off;
242         int err;
243 
244         if (hppfs->contents != NULL) {
245                 int rem;
246 
247                 if (*ppos >= hppfs->len)
248                         return 0;
249 
250                 data = hppfs->contents;
251                 off = *ppos;
252                 while (off >= sizeof(data->contents)) {
253                         data = list_entry(data->list.next, struct hppfs_data,
254                                           list);
255                         off -= sizeof(data->contents);
256                 }
257 
258                 if (off + count > hppfs->len)
259                         count = hppfs->len - off;
260                 rem = copy_to_user(buf, &data->contents[off], count);
261                 *ppos += count - rem;
262                 if (rem > 0)
263                         return -EFAULT;
264         } else if (hppfs->host_fd != -1) {
265                 err = os_seek_file(hppfs->host_fd, *ppos);
266                 if (err) {
267                         printk(KERN_ERR "hppfs_read : seek failed, "
268                                "errno = %d\n", err);
269                         return err;
270                 }
271                 err = hppfs_read_file(hppfs->host_fd, buf, count);
272                 if (err < 0) {
273                         printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
274                         return err;
275                 }
276                 count = err;
277                 if (count > 0)
278                         *ppos += count;
279         }
280         else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
281 
282         return count;
283 }
284 
285 static ssize_t hppfs_write(struct file *file, const char __user *buf,
286                            size_t len, loff_t *ppos)
287 {
288         struct hppfs_private *data = file->private_data;
289         struct file *proc_file = data->proc_file;
290         ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
291 
292         write = file_inode(proc_file)->i_fop->write;
293         return (*write)(proc_file, buf, len, ppos);
294 }
295 
296 static int open_host_sock(char *host_file, int *filter_out)
297 {
298         char *end;
299         int fd;
300 
301         end = &host_file[strlen(host_file)];
302         strcpy(end, "/rw");
303         *filter_out = 1;
304         fd = os_connect_socket(host_file);
305         if (fd > 0)
306                 return fd;
307 
308         strcpy(end, "/r");
309         *filter_out = 0;
310         fd = os_connect_socket(host_file);
311         return fd;
312 }
313 
314 static void free_contents(struct hppfs_data *head)
315 {
316         struct hppfs_data *data;
317         struct list_head *ele, *next;
318 
319         if (head == NULL)
320                 return;
321 
322         list_for_each_safe(ele, next, &head->list) {
323                 data = list_entry(ele, struct hppfs_data, list);
324                 kfree(data);
325         }
326         kfree(head);
327 }
328 
329 static struct hppfs_data *hppfs_get_data(int fd, int filter,
330                                          struct file *proc_file,
331                                          struct file *hppfs_file,
332                                          loff_t *size_out)
333 {
334         struct hppfs_data *data, *new, *head;
335         int n, err;
336 
337         err = -ENOMEM;
338         data = kmalloc(sizeof(*data), GFP_KERNEL);
339         if (data == NULL) {
340                 printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
341                 goto failed;
342         }
343 
344         INIT_LIST_HEAD(&data->list);
345 
346         head = data;
347         *size_out = 0;
348 
349         if (filter) {
350                 while ((n = read_proc(proc_file, data->contents,
351                                       sizeof(data->contents), NULL, 0)) > 0)
352                         os_write_file(fd, data->contents, n);
353                 err = os_shutdown_socket(fd, 0, 1);
354                 if (err) {
355                         printk(KERN_ERR "hppfs_get_data : failed to shut down "
356                                "socket\n");
357                         goto failed_free;
358                 }
359         }
360         while (1) {
361                 n = os_read_file(fd, data->contents, sizeof(data->contents));
362                 if (n < 0) {
363                         err = n;
364                         printk(KERN_ERR "hppfs_get_data : read failed, "
365                                "errno = %d\n", err);
366                         goto failed_free;
367                 } else if (n == 0)
368                         break;
369 
370                 *size_out += n;
371 
372                 if (n < sizeof(data->contents))
373                         break;
374 
375                 new = kmalloc(sizeof(*data), GFP_KERNEL);
376                 if (new == 0) {
377                         printk(KERN_ERR "hppfs_get_data : data allocation "
378                                "failed\n");
379                         err = -ENOMEM;
380                         goto failed_free;
381                 }
382 
383                 INIT_LIST_HEAD(&new->list);
384                 list_add(&new->list, &data->list);
385                 data = new;
386         }
387         return head;
388 
389  failed_free:
390         free_contents(head);
391  failed:
392         return ERR_PTR(err);
393 }
394 
395 static struct hppfs_private *hppfs_data(void)
396 {
397         struct hppfs_private *data;
398 
399         data = kmalloc(sizeof(*data), GFP_KERNEL);
400         if (data == NULL)
401                 return data;
402 
403         *data = ((struct hppfs_private ) { .host_fd             = -1,
404                                            .len                 = -1,
405                                            .contents            = NULL } );
406         return data;
407 }
408 
409 static int file_mode(int fmode)
410 {
411         if (fmode == (FMODE_READ | FMODE_WRITE))
412                 return O_RDWR;
413         if (fmode == FMODE_READ)
414                 return O_RDONLY;
415         if (fmode == FMODE_WRITE)
416                 return O_WRONLY;
417         return 0;
418 }
419 
420 static int hppfs_open(struct inode *inode, struct file *file)
421 {
422         const struct cred *cred = file->f_cred;
423         struct hppfs_private *data;
424         struct path path;
425         char *host_file;
426         int err, fd, type, filter;
427 
428         err = -ENOMEM;
429         data = hppfs_data();
430         if (data == NULL)
431                 goto out;
432 
433         host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
434         if (host_file == NULL)
435                 goto out_free2;
436 
437         path.mnt = inode->i_sb->s_fs_info;
438         path.dentry = HPPFS_I(inode)->proc_dentry;
439 
440         data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred);
441         err = PTR_ERR(data->proc_file);
442         if (IS_ERR(data->proc_file))
443                 goto out_free1;
444 
445         type = os_file_type(host_file);
446         if (type == OS_TYPE_FILE) {
447                 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
448                 if (fd >= 0)
449                         data->host_fd = fd;
450                 else
451                         printk(KERN_ERR "hppfs_open : failed to open '%s', "
452                                "errno = %d\n", host_file, -fd);
453 
454                 data->contents = NULL;
455         } else if (type == OS_TYPE_DIR) {
456                 fd = open_host_sock(host_file, &filter);
457                 if (fd > 0) {
458                         data->contents = hppfs_get_data(fd, filter,
459                                                         data->proc_file,
460                                                         file, &data->len);
461                         if (!IS_ERR(data->contents))
462                                 data->host_fd = fd;
463                 } else
464                         printk(KERN_ERR "hppfs_open : failed to open a socket "
465                                "in '%s', errno = %d\n", host_file, -fd);
466         }
467         kfree(host_file);
468 
469         file->private_data = data;
470         return 0;
471 
472  out_free1:
473         kfree(host_file);
474  out_free2:
475         free_contents(data->contents);
476         kfree(data);
477  out:
478         return err;
479 }
480 
481 static int hppfs_dir_open(struct inode *inode, struct file *file)
482 {
483         const struct cred *cred = file->f_cred;
484         struct hppfs_private *data;
485         struct path path;
486         int err;
487 
488         err = -ENOMEM;
489         data = hppfs_data();
490         if (data == NULL)
491                 goto out;
492 
493         path.mnt = inode->i_sb->s_fs_info;
494         path.dentry = HPPFS_I(inode)->proc_dentry;
495         data->proc_file = dentry_open(&path, file_mode(file->f_mode), cred);
496         err = PTR_ERR(data->proc_file);
497         if (IS_ERR(data->proc_file))
498                 goto out_free;
499 
500         file->private_data = data;
501         return 0;
502 
503  out_free:
504         kfree(data);
505  out:
506         return err;
507 }
508 
509 static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
510 {
511         struct hppfs_private *data = file->private_data;
512         struct file *proc_file = data->proc_file;
513         loff_t (*llseek)(struct file *, loff_t, int);
514         loff_t ret;
515 
516         llseek = file_inode(proc_file)->i_fop->llseek;
517         if (llseek != NULL) {
518                 ret = (*llseek)(proc_file, off, where);
519                 if (ret < 0)
520                         return ret;
521         }
522 
523         return default_llseek(file, off, where);
524 }
525 
526 static int hppfs_release(struct inode *inode, struct file *file)
527 {
528         struct hppfs_private *data = file->private_data;
529         struct file *proc_file = data->proc_file;
530         if (proc_file)
531                 fput(proc_file);
532         kfree(data);
533         return 0;
534 }
535 
536 static const struct file_operations hppfs_file_fops = {
537         .owner          = NULL,
538         .llseek         = hppfs_llseek,
539         .read           = hppfs_read,
540         .write          = hppfs_write,
541         .open           = hppfs_open,
542         .release        = hppfs_release,
543 };
544 
545 struct hppfs_dirent {
546         struct dir_context ctx;
547         struct dir_context *caller;
548         struct dentry *dentry;
549 };
550 
551 static int hppfs_filldir(void *d, const char *name, int size,
552                          loff_t offset, u64 inode, unsigned int type)
553 {
554         struct hppfs_dirent *dirent = d;
555 
556         if (file_removed(dirent->dentry, name))
557                 return 0;
558 
559         dirent->caller->pos = dirent->ctx.pos;
560         return !dir_emit(dirent->caller, name, size, inode, type);
561 }
562 
563 static int hppfs_readdir(struct file *file, struct dir_context *ctx)
564 {
565         struct hppfs_private *data = file->private_data;
566         struct file *proc_file = data->proc_file;
567         struct hppfs_dirent d = {
568                 .ctx.actor      = hppfs_filldir,
569                 .caller         = ctx,
570                 .dentry         = file->f_path.dentry
571         };
572         int err;
573         proc_file->f_pos = ctx->pos;
574         err = iterate_dir(proc_file, &d.ctx);
575         ctx->pos = d.ctx.pos;
576         return err;
577 }
578 
579 static const struct file_operations hppfs_dir_fops = {
580         .owner          = NULL,
581         .iterate        = hppfs_readdir,
582         .open           = hppfs_dir_open,
583         .llseek         = default_llseek,
584         .release        = hppfs_release,
585 };
586 
587 static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
588 {
589         sf->f_blocks = 0;
590         sf->f_bfree = 0;
591         sf->f_bavail = 0;
592         sf->f_files = 0;
593         sf->f_ffree = 0;
594         sf->f_type = HPPFS_SUPER_MAGIC;
595         return 0;
596 }
597 
598 static struct inode *hppfs_alloc_inode(struct super_block *sb)
599 {
600         struct hppfs_inode_info *hi;
601 
602         hi = kmalloc(sizeof(*hi), GFP_KERNEL);
603         if (!hi)
604                 return NULL;
605 
606         hi->proc_dentry = NULL;
607         inode_init_once(&hi->vfs_inode);
608         return &hi->vfs_inode;
609 }
610 
611 void hppfs_evict_inode(struct inode *ino)
612 {
613         clear_inode(ino);
614         dput(HPPFS_I(ino)->proc_dentry);
615         mntput(ino->i_sb->s_fs_info);
616 }
617 
618 static void hppfs_i_callback(struct rcu_head *head)
619 {
620         struct inode *inode = container_of(head, struct inode, i_rcu);
621         kfree(HPPFS_I(inode));
622 }
623 
624 static void hppfs_destroy_inode(struct inode *inode)
625 {
626         call_rcu(&inode->i_rcu, hppfs_i_callback);
627 }
628 
629 static const struct super_operations hppfs_sbops = {
630         .alloc_inode    = hppfs_alloc_inode,
631         .destroy_inode  = hppfs_destroy_inode,
632         .evict_inode    = hppfs_evict_inode,
633         .statfs         = hppfs_statfs,
634 };
635 
636 static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
637                           int buflen)
638 {
639         struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
640         return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
641                                                     buflen);
642 }
643 
644 static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
645 {
646         struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
647 
648         return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
649 }
650 
651 static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
652                            void *cookie)
653 {
654         struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
655 
656         if (proc_dentry->d_inode->i_op->put_link)
657                 proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie);
658 }
659 
660 static const struct inode_operations hppfs_dir_iops = {
661         .lookup         = hppfs_lookup,
662 };
663 
664 static const struct inode_operations hppfs_link_iops = {
665         .readlink       = hppfs_readlink,
666         .follow_link    = hppfs_follow_link,
667         .put_link       = hppfs_put_link,
668 };
669 
670 static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
671 {
672         struct inode *proc_ino = dentry->d_inode;
673         struct inode *inode = new_inode(sb);
674 
675         if (!inode) {
676                 dput(dentry);
677                 return NULL;
678         }
679 
680         if (S_ISDIR(dentry->d_inode->i_mode)) {
681                 inode->i_op = &hppfs_dir_iops;
682                 inode->i_fop = &hppfs_dir_fops;
683         } else if (S_ISLNK(dentry->d_inode->i_mode)) {
684                 inode->i_op = &hppfs_link_iops;
685                 inode->i_fop = &hppfs_file_fops;
686         } else {
687                 inode->i_op = &hppfs_file_iops;
688                 inode->i_fop = &hppfs_file_fops;
689         }
690 
691         HPPFS_I(inode)->proc_dentry = dentry;
692 
693         inode->i_uid = proc_ino->i_uid;
694         inode->i_gid = proc_ino->i_gid;
695         inode->i_atime = proc_ino->i_atime;
696         inode->i_mtime = proc_ino->i_mtime;
697         inode->i_ctime = proc_ino->i_ctime;
698         inode->i_ino = proc_ino->i_ino;
699         inode->i_mode = proc_ino->i_mode;
700         set_nlink(inode, proc_ino->i_nlink);
701         inode->i_size = proc_ino->i_size;
702         inode->i_blocks = proc_ino->i_blocks;
703 
704         return inode;
705 }
706 
707 static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
708 {
709         struct inode *root_inode;
710         struct vfsmount *proc_mnt;
711         int err = -ENOENT;
712 
713         proc_mnt = mntget(task_active_pid_ns(current)->proc_mnt);
714         if (IS_ERR(proc_mnt))
715                 goto out;
716 
717         sb->s_blocksize = 1024;
718         sb->s_blocksize_bits = 10;
719         sb->s_magic = HPPFS_SUPER_MAGIC;
720         sb->s_op = &hppfs_sbops;
721         sb->s_fs_info = proc_mnt;
722 
723         err = -ENOMEM;
724         root_inode = get_inode(sb, dget(proc_mnt->mnt_root));
725         sb->s_root = d_make_root(root_inode);
726         if (!sb->s_root)
727                 goto out_mntput;
728 
729         return 0;
730 
731  out_mntput:
732         mntput(proc_mnt);
733  out:
734         return(err);
735 }
736 
737 static struct dentry *hppfs_read_super(struct file_system_type *type,
738                             int flags, const char *dev_name,
739                             void *data)
740 {
741         return mount_nodev(type, flags, data, hppfs_fill_super);
742 }
743 
744 static struct file_system_type hppfs_type = {
745         .owner          = THIS_MODULE,
746         .name           = "hppfs",
747         .mount          = hppfs_read_super,
748         .kill_sb        = kill_anon_super,
749         .fs_flags       = 0,
750 };
751 MODULE_ALIAS_FS("hppfs");
752 
753 static int __init init_hppfs(void)
754 {
755         return register_filesystem(&hppfs_type);
756 }
757 
758 static void __exit exit_hppfs(void)
759 {
760         unregister_filesystem(&hppfs_type);
761 }
762 
763 module_init(init_hppfs)
764 module_exit(exit_hppfs)
765 MODULE_LICENSE("GPL");
766 

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