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

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