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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * (C) 2001 Clemson University and The University of Chicago
  4  *
  5  * See COPYING in top-level directory.
  6  */
  7 
  8 /*
  9  *  Linux VFS inode operations.
 10  */
 11 
 12 #include <linux/bvec.h>
 13 #include "protocol.h"
 14 #include "orangefs-kernel.h"
 15 #include "orangefs-bufmap.h"
 16 
 17 static int read_one_page(struct page *page)
 18 {
 19         int ret;
 20         int max_block;
 21         ssize_t bytes_read = 0;
 22         struct inode *inode = page->mapping->host;
 23         const __u32 blocksize = PAGE_SIZE;
 24         const __u32 blockbits = PAGE_SHIFT;
 25         struct iov_iter to;
 26         struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE};
 27 
 28         iov_iter_bvec(&to, READ, &bv, 1, PAGE_SIZE);
 29 
 30         gossip_debug(GOSSIP_INODE_DEBUG,
 31                     "orangefs_readpage called with page %p\n",
 32                      page);
 33 
 34         max_block = ((inode->i_size / blocksize) + 1);
 35 
 36         if (page->index < max_block) {
 37                 loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
 38 
 39                 bytes_read = orangefs_inode_read(inode,
 40                                                  &to,
 41                                                  &blockptr_offset,
 42                                                  inode->i_size);
 43         }
 44         /* this will only zero remaining unread portions of the page data */
 45         iov_iter_zero(~0U, &to);
 46         /* takes care of potential aliasing */
 47         flush_dcache_page(page);
 48         if (bytes_read < 0) {
 49                 ret = bytes_read;
 50                 SetPageError(page);
 51         } else {
 52                 SetPageUptodate(page);
 53                 if (PageError(page))
 54                         ClearPageError(page);
 55                 ret = 0;
 56         }
 57         /* unlock the page after the ->readpage() routine completes */
 58         unlock_page(page);
 59         return ret;
 60 }
 61 
 62 static int orangefs_readpage(struct file *file, struct page *page)
 63 {
 64         return read_one_page(page);
 65 }
 66 
 67 static int orangefs_readpages(struct file *file,
 68                            struct address_space *mapping,
 69                            struct list_head *pages,
 70                            unsigned nr_pages)
 71 {
 72         int page_idx;
 73         int ret;
 74 
 75         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n");
 76 
 77         for (page_idx = 0; page_idx < nr_pages; page_idx++) {
 78                 struct page *page;
 79 
 80                 page = lru_to_page(pages);
 81                 list_del(&page->lru);
 82                 if (!add_to_page_cache(page,
 83                                        mapping,
 84                                        page->index,
 85                                        readahead_gfp_mask(mapping))) {
 86                         ret = read_one_page(page);
 87                         gossip_debug(GOSSIP_INODE_DEBUG,
 88                                 "failure adding page to cache, read_one_page returned: %d\n",
 89                                 ret);
 90               } else {
 91                         put_page(page);
 92               }
 93         }
 94         BUG_ON(!list_empty(pages));
 95         return 0;
 96 }
 97 
 98 static void orangefs_invalidatepage(struct page *page,
 99                                  unsigned int offset,
100                                  unsigned int length)
101 {
102         gossip_debug(GOSSIP_INODE_DEBUG,
103                      "orangefs_invalidatepage called on page %p "
104                      "(offset is %u)\n",
105                      page,
106                      offset);
107 
108         ClearPageUptodate(page);
109         ClearPageMappedToDisk(page);
110         return;
111 
112 }
113 
114 static int orangefs_releasepage(struct page *page, gfp_t foo)
115 {
116         gossip_debug(GOSSIP_INODE_DEBUG,
117                      "orangefs_releasepage called on page %p\n",
118                      page);
119         return 0;
120 }
121 
122 /*
123  * Having a direct_IO entry point in the address_space_operations
124  * struct causes the kernel to allows us to use O_DIRECT on
125  * open. Nothing will ever call this thing, but in the future we
126  * will need to be able to use O_DIRECT on open in order to support
127  * AIO. Modeled after NFS, they do this too.
128  */
129 
130 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
131                                   struct iov_iter *iter)
132 {
133         gossip_debug(GOSSIP_INODE_DEBUG,
134                      "orangefs_direct_IO: %pD\n",
135                      iocb->ki_filp);
136 
137         return -EINVAL;
138 }
139 
140 /** ORANGEFS2 implementation of address space operations */
141 static const struct address_space_operations orangefs_address_operations = {
142         .readpage = orangefs_readpage,
143         .readpages = orangefs_readpages,
144         .invalidatepage = orangefs_invalidatepage,
145         .releasepage = orangefs_releasepage,
146         .direct_IO = orangefs_direct_IO,
147 };
148 
149 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
150 {
151         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
152         struct orangefs_kernel_op_s *new_op;
153         loff_t orig_size;
154         int ret = -EINVAL;
155 
156         gossip_debug(GOSSIP_INODE_DEBUG,
157                      "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
158                      __func__,
159                      get_khandle_from_ino(inode),
160                      &orangefs_inode->refn.khandle,
161                      orangefs_inode->refn.fs_id,
162                      iattr->ia_size);
163 
164         /* Ensure that we have a up to date size, so we know if it changed. */
165         ret = orangefs_inode_getattr(inode, 0, 1, STATX_SIZE);
166         if (ret == -ESTALE)
167                 ret = -EIO;
168         if (ret) {
169                 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
170                     __func__, ret);
171                 return ret;
172         }
173         orig_size = i_size_read(inode);
174 
175         truncate_setsize(inode, iattr->ia_size);
176 
177         new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
178         if (!new_op)
179                 return -ENOMEM;
180 
181         new_op->upcall.req.truncate.refn = orangefs_inode->refn;
182         new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
183 
184         ret = service_operation(new_op,
185                 __func__,
186                 get_interruptible_flag(inode));
187 
188         /*
189          * the truncate has no downcall members to retrieve, but
190          * the status value tells us if it went through ok or not
191          */
192         gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
193 
194         op_release(new_op);
195 
196         if (ret != 0)
197                 return ret;
198 
199         if (orig_size != i_size_read(inode))
200                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
201 
202         return ret;
203 }
204 
205 /*
206  * Change attributes of an object referenced by dentry.
207  */
208 int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
209 {
210         int ret = -EINVAL;
211         struct inode *inode = dentry->d_inode;
212 
213         gossip_debug(GOSSIP_INODE_DEBUG,
214                 "%s: called on %pd\n",
215                 __func__,
216                 dentry);
217 
218         ret = setattr_prepare(dentry, iattr);
219         if (ret)
220                 goto out;
221 
222         if (iattr->ia_valid & ATTR_SIZE) {
223                 ret = orangefs_setattr_size(inode, iattr);
224                 if (ret)
225                         goto out;
226         }
227 
228         setattr_copy(inode, iattr);
229         mark_inode_dirty(inode);
230 
231         ret = orangefs_inode_setattr(inode, iattr);
232         gossip_debug(GOSSIP_INODE_DEBUG,
233                 "%s: orangefs_inode_setattr returned %d\n",
234                 __func__,
235                 ret);
236 
237         if (!ret && (iattr->ia_valid & ATTR_MODE))
238                 /* change mod on a file that has ACLs */
239                 ret = posix_acl_chmod(inode, inode->i_mode);
240 
241 out:
242         gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
243         return ret;
244 }
245 
246 /*
247  * Obtain attributes of an object given a dentry
248  */
249 int orangefs_getattr(const struct path *path, struct kstat *stat,
250                      u32 request_mask, unsigned int flags)
251 {
252         int ret = -ENOENT;
253         struct inode *inode = path->dentry->d_inode;
254 
255         gossip_debug(GOSSIP_INODE_DEBUG,
256                      "orangefs_getattr: called on %pd\n",
257                      path->dentry);
258 
259         ret = orangefs_inode_getattr(inode, 0, 0, request_mask);
260         if (ret == 0) {
261                 generic_fillattr(inode, stat);
262 
263                 /* override block size reported to stat */
264                 if (!(request_mask & STATX_SIZE))
265                         stat->result_mask &= ~STATX_SIZE;
266 
267                 stat->attributes_mask = STATX_ATTR_IMMUTABLE |
268                     STATX_ATTR_APPEND;
269                 if (inode->i_flags & S_IMMUTABLE)
270                         stat->attributes |= STATX_ATTR_IMMUTABLE;
271                 if (inode->i_flags & S_APPEND)
272                         stat->attributes |= STATX_ATTR_APPEND;
273         }
274         return ret;
275 }
276 
277 int orangefs_permission(struct inode *inode, int mask)
278 {
279         int ret;
280 
281         if (mask & MAY_NOT_BLOCK)
282                 return -ECHILD;
283 
284         gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
285 
286         /* Make sure the permission (and other common attrs) are up to date. */
287         ret = orangefs_inode_getattr(inode, 0, 0, STATX_MODE);
288         if (ret < 0)
289                 return ret;
290 
291         return generic_permission(inode, mask);
292 }
293 
294 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
295 {
296         struct iattr iattr;
297         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
298             get_khandle_from_ino(inode));
299         generic_update_time(inode, time, flags);
300         memset(&iattr, 0, sizeof iattr);
301         if (flags & S_ATIME)
302                 iattr.ia_valid |= ATTR_ATIME;
303         if (flags & S_CTIME)
304                 iattr.ia_valid |= ATTR_CTIME;
305         if (flags & S_MTIME)
306                 iattr.ia_valid |= ATTR_MTIME;
307         return orangefs_inode_setattr(inode, &iattr);
308 }
309 
310 /* ORANGEFS2 implementation of VFS inode operations for files */
311 static const struct inode_operations orangefs_file_inode_operations = {
312         .get_acl = orangefs_get_acl,
313         .set_acl = orangefs_set_acl,
314         .setattr = orangefs_setattr,
315         .getattr = orangefs_getattr,
316         .listxattr = orangefs_listxattr,
317         .permission = orangefs_permission,
318         .update_time = orangefs_update_time,
319 };
320 
321 static int orangefs_init_iops(struct inode *inode)
322 {
323         inode->i_mapping->a_ops = &orangefs_address_operations;
324 
325         switch (inode->i_mode & S_IFMT) {
326         case S_IFREG:
327                 inode->i_op = &orangefs_file_inode_operations;
328                 inode->i_fop = &orangefs_file_operations;
329                 break;
330         case S_IFLNK:
331                 inode->i_op = &orangefs_symlink_inode_operations;
332                 break;
333         case S_IFDIR:
334                 inode->i_op = &orangefs_dir_inode_operations;
335                 inode->i_fop = &orangefs_dir_operations;
336                 break;
337         default:
338                 gossip_debug(GOSSIP_INODE_DEBUG,
339                              "%s: unsupported mode\n",
340                              __func__);
341                 return -EINVAL;
342         }
343 
344         return 0;
345 }
346 
347 /*
348  * Given an ORANGEFS object identifier (fsid, handle), convert it into
349  * a ino_t type that will be used as a hash-index from where the handle will
350  * be searched for in the VFS hash table of inodes.
351  */
352 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
353 {
354         if (!ref)
355                 return 0;
356         return orangefs_khandle_to_ino(&(ref->khandle));
357 }
358 
359 /*
360  * Called to set up an inode from iget5_locked.
361  */
362 static int orangefs_set_inode(struct inode *inode, void *data)
363 {
364         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
365         ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
366         ORANGEFS_I(inode)->refn.khandle = ref->khandle;
367         return 0;
368 }
369 
370 /*
371  * Called to determine if handles match.
372  */
373 static int orangefs_test_inode(struct inode *inode, void *data)
374 {
375         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
376         struct orangefs_inode_s *orangefs_inode = NULL;
377 
378         orangefs_inode = ORANGEFS_I(inode);
379         /* test handles and fs_ids... */
380         return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
381                                 &(ref->khandle)) &&
382                         orangefs_inode->refn.fs_id == ref->fs_id);
383 }
384 
385 /*
386  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
387  * file handle.
388  *
389  * @sb: the file system super block instance.
390  * @ref: The ORANGEFS object for which we are trying to locate an inode.
391  */
392 struct inode *orangefs_iget(struct super_block *sb,
393                 struct orangefs_object_kref *ref)
394 {
395         struct inode *inode = NULL;
396         unsigned long hash;
397         int error;
398 
399         hash = orangefs_handle_hash(ref);
400         inode = iget5_locked(sb,
401                         hash,
402                         orangefs_test_inode,
403                         orangefs_set_inode,
404                         ref);
405 
406         if (!inode)
407                 return ERR_PTR(-ENOMEM);
408 
409         if (!(inode->i_state & I_NEW))
410                 return inode;
411 
412         error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
413         if (error) {
414                 iget_failed(inode);
415                 return ERR_PTR(error);
416         }
417 
418         inode->i_ino = hash;    /* needed for stat etc */
419         orangefs_init_iops(inode);
420         unlock_new_inode(inode);
421 
422         gossip_debug(GOSSIP_INODE_DEBUG,
423                      "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
424                      &ref->khandle,
425                      ref->fs_id,
426                      hash,
427                      inode->i_ino);
428 
429         return inode;
430 }
431 
432 /*
433  * Allocate an inode for a newly created file and insert it into the inode hash.
434  */
435 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
436                 int mode, dev_t dev, struct orangefs_object_kref *ref)
437 {
438         unsigned long hash = orangefs_handle_hash(ref);
439         struct inode *inode;
440         int error;
441 
442         gossip_debug(GOSSIP_INODE_DEBUG,
443                      "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
444                      __func__,
445                      sb,
446                      MAJOR(dev),
447                      MINOR(dev),
448                      mode);
449 
450         inode = new_inode(sb);
451         if (!inode)
452                 return ERR_PTR(-ENOMEM);
453 
454         orangefs_set_inode(inode, ref);
455         inode->i_ino = hash;    /* needed for stat etc */
456 
457         error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
458         if (error)
459                 goto out_iput;
460 
461         orangefs_init_iops(inode);
462 
463         inode->i_mode = mode;
464         inode->i_uid = current_fsuid();
465         inode->i_gid = current_fsgid();
466         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
467         inode->i_size = PAGE_SIZE;
468         inode->i_rdev = dev;
469 
470         error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
471         if (error < 0)
472                 goto out_iput;
473 
474         gossip_debug(GOSSIP_INODE_DEBUG,
475                      "Initializing ACL's for inode %pU\n",
476                      get_khandle_from_ino(inode));
477         orangefs_init_acl(inode, dir);
478         return inode;
479 
480 out_iput:
481         iput(inode);
482         return ERR_PTR(error);
483 }
484 

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