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TOMOYO Linux Cross Reference
Linux/fs/orangefs/inode.c

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  1 /*
  2  * (C) 2001 Clemson University and The University of Chicago
  3  *
  4  * See COPYING in top-level directory.
  5  */
  6 
  7 /*
  8  *  Linux VFS inode operations.
  9  */
 10 
 11 #include "protocol.h"
 12 #include "orangefs-kernel.h"
 13 #include "orangefs-bufmap.h"
 14 
 15 static int read_one_page(struct page *page)
 16 {
 17         int ret;
 18         int max_block;
 19         ssize_t bytes_read = 0;
 20         struct inode *inode = page->mapping->host;
 21         const __u32 blocksize = PAGE_SIZE;      /* inode->i_blksize */
 22         const __u32 blockbits = PAGE_SHIFT;     /* inode->i_blkbits */
 23         struct iov_iter to;
 24         struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE};
 25 
 26         iov_iter_bvec(&to, ITER_BVEC | READ, &bv, 1, PAGE_SIZE);
 27 
 28         gossip_debug(GOSSIP_INODE_DEBUG,
 29                     "orangefs_readpage called with page %p\n",
 30                      page);
 31 
 32         max_block = ((inode->i_size / blocksize) + 1);
 33 
 34         if (page->index < max_block) {
 35                 loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
 36 
 37                 bytes_read = orangefs_inode_read(inode,
 38                                                  &to,
 39                                                  &blockptr_offset,
 40                                                  inode->i_size);
 41         }
 42         /* this will only zero remaining unread portions of the page data */
 43         iov_iter_zero(~0U, &to);
 44         /* takes care of potential aliasing */
 45         flush_dcache_page(page);
 46         if (bytes_read < 0) {
 47                 ret = bytes_read;
 48                 SetPageError(page);
 49         } else {
 50                 SetPageUptodate(page);
 51                 if (PageError(page))
 52                         ClearPageError(page);
 53                 ret = 0;
 54         }
 55         /* unlock the page after the ->readpage() routine completes */
 56         unlock_page(page);
 57         return ret;
 58 }
 59 
 60 static int orangefs_readpage(struct file *file, struct page *page)
 61 {
 62         return read_one_page(page);
 63 }
 64 
 65 static int orangefs_readpages(struct file *file,
 66                            struct address_space *mapping,
 67                            struct list_head *pages,
 68                            unsigned nr_pages)
 69 {
 70         int page_idx;
 71         int ret;
 72 
 73         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n");
 74 
 75         for (page_idx = 0; page_idx < nr_pages; page_idx++) {
 76                 struct page *page;
 77 
 78                 page = list_entry(pages->prev, struct page, lru);
 79                 list_del(&page->lru);
 80                 if (!add_to_page_cache(page,
 81                                        mapping,
 82                                        page->index,
 83                                        GFP_KERNEL)) {
 84                         ret = read_one_page(page);
 85                         gossip_debug(GOSSIP_INODE_DEBUG,
 86                                 "failure adding page to cache, read_one_page returned: %d\n",
 87                                 ret);
 88               } else {
 89                         put_page(page);
 90               }
 91         }
 92         BUG_ON(!list_empty(pages));
 93         return 0;
 94 }
 95 
 96 static void orangefs_invalidatepage(struct page *page,
 97                                  unsigned int offset,
 98                                  unsigned int length)
 99 {
100         gossip_debug(GOSSIP_INODE_DEBUG,
101                      "orangefs_invalidatepage called on page %p "
102                      "(offset is %u)\n",
103                      page,
104                      offset);
105 
106         ClearPageUptodate(page);
107         ClearPageMappedToDisk(page);
108         return;
109 
110 }
111 
112 static int orangefs_releasepage(struct page *page, gfp_t foo)
113 {
114         gossip_debug(GOSSIP_INODE_DEBUG,
115                      "orangefs_releasepage called on page %p\n",
116                      page);
117         return 0;
118 }
119 
120 /*
121  * Having a direct_IO entry point in the address_space_operations
122  * struct causes the kernel to allows us to use O_DIRECT on
123  * open. Nothing will ever call this thing, but in the future we
124  * will need to be able to use O_DIRECT on open in order to support
125  * AIO. Modeled after NFS, they do this too.
126  */
127 /*
128  * static ssize_t orangefs_direct_IO(int rw,
129  *                      struct kiocb *iocb,
130  *                      struct iov_iter *iter,
131  *                      loff_t offset)
132  *{
133  *      gossip_debug(GOSSIP_INODE_DEBUG,
134  *                   "orangefs_direct_IO: %s\n",
135  *                   iocb->ki_filp->f_path.dentry->d_name.name);
136  *
137  *      return -EINVAL;
138  *}
139  */
140 
141 struct backing_dev_info orangefs_backing_dev_info = {
142         .name = "orangefs",
143         .ra_pages = 0,
144         .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
145 };
146 
147 /** ORANGEFS2 implementation of address space operations */
148 const struct address_space_operations orangefs_address_operations = {
149         .readpage = orangefs_readpage,
150         .readpages = orangefs_readpages,
151         .invalidatepage = orangefs_invalidatepage,
152         .releasepage = orangefs_releasepage,
153 /*      .direct_IO = orangefs_direct_IO */
154 };
155 
156 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
157 {
158         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
159         struct orangefs_kernel_op_s *new_op;
160         loff_t orig_size;
161         int ret = -EINVAL;
162 
163         gossip_debug(GOSSIP_INODE_DEBUG,
164                      "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
165                      __func__,
166                      get_khandle_from_ino(inode),
167                      &orangefs_inode->refn.khandle,
168                      orangefs_inode->refn.fs_id,
169                      iattr->ia_size);
170 
171         /* Ensure that we have a up to date size, so we know if it changed. */
172         ret = orangefs_inode_getattr(inode, 0, 1);
173         if (ret == -ESTALE)
174                 ret = -EIO;
175         if (ret) {
176                 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
177                     __func__, ret);
178                 return ret;
179         }
180         orig_size = i_size_read(inode);
181 
182         truncate_setsize(inode, iattr->ia_size);
183 
184         new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
185         if (!new_op)
186                 return -ENOMEM;
187 
188         new_op->upcall.req.truncate.refn = orangefs_inode->refn;
189         new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
190 
191         ret = service_operation(new_op, __func__,
192                                 get_interruptible_flag(inode));
193 
194         /*
195          * the truncate has no downcall members to retrieve, but
196          * the status value tells us if it went through ok or not
197          */
198         gossip_debug(GOSSIP_INODE_DEBUG,
199                      "orangefs: orangefs_truncate got return value of %d\n",
200                      ret);
201 
202         op_release(new_op);
203 
204         if (ret != 0)
205                 return ret;
206 
207         if (orig_size != i_size_read(inode))
208                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
209 
210         return ret;
211 }
212 
213 /*
214  * Change attributes of an object referenced by dentry.
215  */
216 int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
217 {
218         int ret = -EINVAL;
219         struct inode *inode = dentry->d_inode;
220 
221         gossip_debug(GOSSIP_INODE_DEBUG,
222                      "orangefs_setattr: called on %s\n",
223                      dentry->d_name.name);
224 
225         ret = inode_change_ok(inode, iattr);
226         if (ret)
227                 goto out;
228 
229         if ((iattr->ia_valid & ATTR_SIZE) &&
230             iattr->ia_size != i_size_read(inode)) {
231                 ret = orangefs_setattr_size(inode, iattr);
232                 if (ret)
233                         goto out;
234         }
235 
236         setattr_copy(inode, iattr);
237         mark_inode_dirty(inode);
238 
239         ret = orangefs_inode_setattr(inode, iattr);
240         gossip_debug(GOSSIP_INODE_DEBUG,
241                      "orangefs_setattr: inode_setattr returned %d\n",
242                      ret);
243 
244         if (!ret && (iattr->ia_valid & ATTR_MODE))
245                 /* change mod on a file that has ACLs */
246                 ret = posix_acl_chmod(inode, inode->i_mode);
247 
248 out:
249         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n", ret);
250         return ret;
251 }
252 
253 /*
254  * Obtain attributes of an object given a dentry
255  */
256 int orangefs_getattr(struct vfsmount *mnt,
257                   struct dentry *dentry,
258                   struct kstat *kstat)
259 {
260         int ret = -ENOENT;
261         struct inode *inode = dentry->d_inode;
262         struct orangefs_inode_s *orangefs_inode = NULL;
263 
264         gossip_debug(GOSSIP_INODE_DEBUG,
265                      "orangefs_getattr: called on %s\n",
266                      dentry->d_name.name);
267 
268         ret = orangefs_inode_getattr(inode, 0, 1);
269         if (ret == 0) {
270                 generic_fillattr(inode, kstat);
271 
272                 /* override block size reported to stat */
273                 orangefs_inode = ORANGEFS_I(inode);
274                 kstat->blksize = orangefs_inode->blksize;
275         }
276         return ret;
277 }
278 
279 int orangefs_permission(struct inode *inode, int mask)
280 {
281         int ret;
282 
283         if (mask & MAY_NOT_BLOCK)
284                 return -ECHILD;
285 
286         gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
287 
288         /* Make sure the permission (and other common attrs) are up to date. */
289         ret = orangefs_inode_getattr(inode, 0, 0);
290         if (ret < 0)
291                 return ret;
292 
293         return generic_permission(inode, mask);
294 }
295 
296 /* ORANGEDS2 implementation of VFS inode operations for files */
297 struct inode_operations orangefs_file_inode_operations = {
298         .get_acl = orangefs_get_acl,
299         .set_acl = orangefs_set_acl,
300         .setattr = orangefs_setattr,
301         .getattr = orangefs_getattr,
302         .setxattr = generic_setxattr,
303         .getxattr = generic_getxattr,
304         .listxattr = orangefs_listxattr,
305         .removexattr = generic_removexattr,
306         .permission = orangefs_permission,
307 };
308 
309 static int orangefs_init_iops(struct inode *inode)
310 {
311         inode->i_mapping->a_ops = &orangefs_address_operations;
312 
313         switch (inode->i_mode & S_IFMT) {
314         case S_IFREG:
315                 inode->i_op = &orangefs_file_inode_operations;
316                 inode->i_fop = &orangefs_file_operations;
317                 inode->i_blkbits = PAGE_SHIFT;
318                 break;
319         case S_IFLNK:
320                 inode->i_op = &orangefs_symlink_inode_operations;
321                 break;
322         case S_IFDIR:
323                 inode->i_op = &orangefs_dir_inode_operations;
324                 inode->i_fop = &orangefs_dir_operations;
325                 break;
326         default:
327                 gossip_debug(GOSSIP_INODE_DEBUG,
328                              "%s: unsupported mode\n",
329                              __func__);
330                 return -EINVAL;
331         }
332 
333         return 0;
334 }
335 
336 /*
337  * Given a ORANGEFS object identifier (fsid, handle), convert it into a ino_t type
338  * that will be used as a hash-index from where the handle will
339  * be searched for in the VFS hash table of inodes.
340  */
341 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
342 {
343         if (!ref)
344                 return 0;
345         return orangefs_khandle_to_ino(&(ref->khandle));
346 }
347 
348 /*
349  * Called to set up an inode from iget5_locked.
350  */
351 static int orangefs_set_inode(struct inode *inode, void *data)
352 {
353         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
354         ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
355         ORANGEFS_I(inode)->refn.khandle = ref->khandle;
356         return 0;
357 }
358 
359 /*
360  * Called to determine if handles match.
361  */
362 static int orangefs_test_inode(struct inode *inode, void *data)
363 {
364         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
365         struct orangefs_inode_s *orangefs_inode = NULL;
366 
367         orangefs_inode = ORANGEFS_I(inode);
368         return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle), &(ref->khandle))
369                 && orangefs_inode->refn.fs_id == ref->fs_id);
370 }
371 
372 /*
373  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
374  * file handle.
375  *
376  * @sb: the file system super block instance.
377  * @ref: The ORANGEFS object for which we are trying to locate an inode structure.
378  */
379 struct inode *orangefs_iget(struct super_block *sb, struct orangefs_object_kref *ref)
380 {
381         struct inode *inode = NULL;
382         unsigned long hash;
383         int error;
384 
385         hash = orangefs_handle_hash(ref);
386         inode = iget5_locked(sb, hash, orangefs_test_inode, orangefs_set_inode, ref);
387         if (!inode || !(inode->i_state & I_NEW))
388                 return inode;
389 
390         error = orangefs_inode_getattr(inode, 1, 0);
391         if (error) {
392                 iget_failed(inode);
393                 return ERR_PTR(error);
394         }
395 
396         inode->i_ino = hash;    /* needed for stat etc */
397         orangefs_init_iops(inode);
398         unlock_new_inode(inode);
399 
400         gossip_debug(GOSSIP_INODE_DEBUG,
401                      "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
402                      &ref->khandle,
403                      ref->fs_id,
404                      hash,
405                      inode->i_ino);
406 
407         return inode;
408 }
409 
410 /*
411  * Allocate an inode for a newly created file and insert it into the inode hash.
412  */
413 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
414                 int mode, dev_t dev, struct orangefs_object_kref *ref)
415 {
416         unsigned long hash = orangefs_handle_hash(ref);
417         struct inode *inode;
418         int error;
419 
420         gossip_debug(GOSSIP_INODE_DEBUG,
421                      "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
422                      __func__,
423                      sb,
424                      MAJOR(dev),
425                      MINOR(dev),
426                      mode);
427 
428         inode = new_inode(sb);
429         if (!inode)
430                 return NULL;
431 
432         orangefs_set_inode(inode, ref);
433         inode->i_ino = hash;    /* needed for stat etc */
434 
435         error = orangefs_inode_getattr(inode, 1, 0);
436         if (error)
437                 goto out_iput;
438 
439         orangefs_init_iops(inode);
440 
441         inode->i_mode = mode;
442         inode->i_uid = current_fsuid();
443         inode->i_gid = current_fsgid();
444         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
445         inode->i_size = PAGE_SIZE;
446         inode->i_rdev = dev;
447 
448         error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
449         if (error < 0)
450                 goto out_iput;
451 
452         gossip_debug(GOSSIP_INODE_DEBUG,
453                      "Initializing ACL's for inode %pU\n",
454                      get_khandle_from_ino(inode));
455         orangefs_init_acl(inode, dir);
456         return inode;
457 
458 out_iput:
459         iput(inode);
460         return ERR_PTR(error);
461 }
462 

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