2 * (C) 2001 Clemson University and The University of Chicago
4 * See COPYING in top-level directory.
8 * Linux VFS inode operations.
12 #include "pvfs2-kernel.h"
13 #include "pvfs2-bufmap.h"
15 static int read_one_page(struct page *page)
20 ssize_t bytes_read = 0;
21 struct inode *inode = page->mapping->host;
22 const __u32 blocksize = PAGE_CACHE_SIZE; /* inode->i_blksize */
23 const __u32 blockbits = PAGE_CACHE_SHIFT; /* inode->i_blkbits */
25 gossip_debug(GOSSIP_INODE_DEBUG,
26 "pvfs2_readpage called with page %p\n",
28 page_data = pvfs2_kmap(page);
30 max_block = ((inode->i_size / blocksize) + 1);
32 if (page->index < max_block) {
33 loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
35 bytes_read = pvfs2_inode_read(inode,
36 (char __user *) page_data,
41 /* only zero remaining unread portions of the page data */
43 memset(page_data + bytes_read, 0, blocksize - bytes_read);
45 memset(page_data, 0, blocksize);
46 /* takes care of potential aliasing */
47 flush_dcache_page(page);
52 SetPageUptodate(page);
58 /* unlock the page after the ->readpage() routine completes */
63 static int pvfs2_readpage(struct file *file, struct page *page)
65 return read_one_page(page);
68 static int pvfs2_readpages(struct file *file,
69 struct address_space *mapping,
70 struct list_head *pages,
76 gossip_debug(GOSSIP_INODE_DEBUG, "pvfs2_readpages called\n");
78 for (page_idx = 0; page_idx < nr_pages; page_idx++) {
81 page = list_entry(pages->prev, struct page, lru);
83 if (!add_to_page_cache(page,
87 ret = read_one_page(page);
88 gossip_debug(GOSSIP_INODE_DEBUG,
89 "failure adding page to cache, read_one_page returned: %d\n",
92 page_cache_release(page);
95 BUG_ON(!list_empty(pages));
99 static void pvfs2_invalidatepage(struct page *page,
103 gossip_debug(GOSSIP_INODE_DEBUG,
104 "pvfs2_invalidatepage called on page %p "
109 ClearPageUptodate(page);
110 ClearPageMappedToDisk(page);
115 static int pvfs2_releasepage(struct page *page, gfp_t foo)
117 gossip_debug(GOSSIP_INODE_DEBUG,
118 "pvfs2_releasepage called on page %p\n",
124 * Having a direct_IO entry point in the address_space_operations
125 * struct causes the kernel to allows us to use O_DIRECT on
126 * open. Nothing will ever call this thing, but in the future we
127 * will need to be able to use O_DIRECT on open in order to support
128 * AIO. Modeled after NFS, they do this too.
131 * static ssize_t pvfs2_direct_IO(int rw,
132 * struct kiocb *iocb,
133 * struct iov_iter *iter,
136 * gossip_debug(GOSSIP_INODE_DEBUG,
137 * "pvfs2_direct_IO: %s\n",
138 * iocb->ki_filp->f_path.dentry->d_name.name);
144 struct backing_dev_info pvfs2_backing_dev_info = {
147 .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
150 /** PVFS2 implementation of address space operations */
151 const struct address_space_operations pvfs2_address_operations = {
152 .readpage = pvfs2_readpage,
153 .readpages = pvfs2_readpages,
154 .invalidatepage = pvfs2_invalidatepage,
155 .releasepage = pvfs2_releasepage,
156 /* .direct_IO = pvfs2_direct_IO */
159 static int pvfs2_setattr_size(struct inode *inode, struct iattr *iattr)
161 struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
162 struct pvfs2_kernel_op_s *new_op;
163 loff_t orig_size = i_size_read(inode);
166 gossip_debug(GOSSIP_INODE_DEBUG,
167 "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
169 get_khandle_from_ino(inode),
170 &pvfs2_inode->refn.khandle,
171 pvfs2_inode->refn.fs_id,
174 truncate_setsize(inode, iattr->ia_size);
176 new_op = op_alloc(PVFS2_VFS_OP_TRUNCATE);
180 new_op->upcall.req.truncate.refn = pvfs2_inode->refn;
181 new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
183 ret = service_operation(new_op, __func__,
184 get_interruptible_flag(inode));
187 * the truncate has no downcall members to retrieve, but
188 * the status value tells us if it went through ok or not
190 gossip_debug(GOSSIP_INODE_DEBUG,
191 "pvfs2: pvfs2_truncate got return value of %d\n",
200 * Only change the c/mtime if we are changing the size or we are
201 * explicitly asked to change it. This handles the semantic difference
202 * between truncate() and ftruncate() as implemented in the VFS.
204 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
205 * special case where we need to update the times despite not having
206 * these flags set. For all other operations the VFS set these flags
207 * explicitly if it wants a timestamp update.
209 if (orig_size != i_size_read(inode) &&
210 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
211 iattr->ia_ctime = iattr->ia_mtime =
212 current_fs_time(inode->i_sb);
213 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
220 * Change attributes of an object referenced by dentry.
222 int pvfs2_setattr(struct dentry *dentry, struct iattr *iattr)
225 struct inode *inode = dentry->d_inode;
227 gossip_debug(GOSSIP_INODE_DEBUG,
228 "pvfs2_setattr: called on %s\n",
229 dentry->d_name.name);
231 ret = inode_change_ok(inode, iattr);
235 if ((iattr->ia_valid & ATTR_SIZE) &&
236 iattr->ia_size != i_size_read(inode)) {
237 ret = pvfs2_setattr_size(inode, iattr);
242 setattr_copy(inode, iattr);
243 mark_inode_dirty(inode);
245 ret = pvfs2_inode_setattr(inode, iattr);
246 gossip_debug(GOSSIP_INODE_DEBUG,
247 "pvfs2_setattr: inode_setattr returned %d\n",
250 if (!ret && (iattr->ia_valid & ATTR_MODE))
251 /* change mod on a file that has ACLs */
252 ret = posix_acl_chmod(inode, inode->i_mode);
255 gossip_debug(GOSSIP_INODE_DEBUG, "pvfs2_setattr: returning %d\n", ret);
260 * Obtain attributes of an object given a dentry
262 int pvfs2_getattr(struct vfsmount *mnt,
263 struct dentry *dentry,
267 struct inode *inode = dentry->d_inode;
268 struct pvfs2_inode_s *pvfs2_inode = NULL;
270 gossip_debug(GOSSIP_INODE_DEBUG,
271 "pvfs2_getattr: called on %s\n",
272 dentry->d_name.name);
275 * Similar to the above comment, a getattr also expects that all
276 * fields/attributes of the inode would be refreshed. So again, we
277 * dont have too much of a choice but refresh all the attributes.
279 ret = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
281 generic_fillattr(inode, kstat);
282 /* override block size reported to stat */
283 pvfs2_inode = PVFS2_I(inode);
284 kstat->blksize = pvfs2_inode->blksize;
286 /* assume an I/O error and flag inode as bad */
287 gossip_debug(GOSSIP_INODE_DEBUG,
288 "%s:%s:%d calling make bad inode\n",
292 pvfs2_make_bad_inode(inode);
297 /* PVFS2 implementation of VFS inode operations for files */
298 struct inode_operations pvfs2_file_inode_operations = {
299 .get_acl = pvfs2_get_acl,
300 .set_acl = pvfs2_set_acl,
301 .setattr = pvfs2_setattr,
302 .getattr = pvfs2_getattr,
303 .setxattr = generic_setxattr,
304 .getxattr = generic_getxattr,
305 .listxattr = pvfs2_listxattr,
306 .removexattr = generic_removexattr,
309 static int pvfs2_init_iops(struct inode *inode)
311 inode->i_mapping->a_ops = &pvfs2_address_operations;
313 switch (inode->i_mode & S_IFMT) {
315 inode->i_op = &pvfs2_file_inode_operations;
316 inode->i_fop = &pvfs2_file_operations;
317 inode->i_blkbits = PAGE_CACHE_SHIFT;
320 inode->i_op = &pvfs2_symlink_inode_operations;
323 inode->i_op = &pvfs2_dir_inode_operations;
324 inode->i_fop = &pvfs2_dir_operations;
327 gossip_debug(GOSSIP_INODE_DEBUG,
328 "%s: unsupported mode\n",
337 * Given a PVFS2 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.
341 static inline ino_t pvfs2_handle_hash(struct pvfs2_object_kref *ref)
345 return pvfs2_khandle_to_ino(&(ref->khandle));
349 * Called to set up an inode from iget5_locked.
351 static int pvfs2_set_inode(struct inode *inode, void *data)
353 struct pvfs2_object_kref *ref = (struct pvfs2_object_kref *) data;
354 struct pvfs2_inode_s *pvfs2_inode = NULL;
356 /* Make sure that we have sane parameters */
359 pvfs2_inode = PVFS2_I(inode);
362 pvfs2_inode->refn.fs_id = ref->fs_id;
363 pvfs2_inode->refn.khandle = ref->khandle;
368 * Called to determine if handles match.
370 static int pvfs2_test_inode(struct inode *inode, void *data)
372 struct pvfs2_object_kref *ref = (struct pvfs2_object_kref *) data;
373 struct pvfs2_inode_s *pvfs2_inode = NULL;
375 pvfs2_inode = PVFS2_I(inode);
376 return (!PVFS_khandle_cmp(&(pvfs2_inode->refn.khandle), &(ref->khandle))
377 && pvfs2_inode->refn.fs_id == ref->fs_id);
381 * Front-end to lookup the inode-cache maintained by the VFS using the PVFS2
384 * @sb: the file system super block instance.
385 * @ref: The PVFS2 object for which we are trying to locate an inode structure.
387 struct inode *pvfs2_iget(struct super_block *sb, struct pvfs2_object_kref *ref)
389 struct inode *inode = NULL;
393 hash = pvfs2_handle_hash(ref);
394 inode = iget5_locked(sb, hash, pvfs2_test_inode, pvfs2_set_inode, ref);
395 if (!inode || !(inode->i_state & I_NEW))
398 error = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
401 return ERR_PTR(error);
404 inode->i_ino = hash; /* needed for stat etc */
405 pvfs2_init_iops(inode);
406 unlock_new_inode(inode);
408 gossip_debug(GOSSIP_INODE_DEBUG,
409 "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
419 * Allocate an inode for a newly created file and insert it into the inode hash.
421 struct inode *pvfs2_new_inode(struct super_block *sb, struct inode *dir,
422 int mode, dev_t dev, struct pvfs2_object_kref *ref)
424 unsigned long hash = pvfs2_handle_hash(ref);
428 gossip_debug(GOSSIP_INODE_DEBUG,
429 "pvfs2_get_custom_inode_common: called\n"
430 "(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
436 inode = new_inode(sb);
440 pvfs2_set_inode(inode, ref);
441 inode->i_ino = hash; /* needed for stat etc */
443 error = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
447 pvfs2_init_iops(inode);
449 inode->i_mode = mode;
450 inode->i_uid = current_fsuid();
451 inode->i_gid = current_fsgid();
452 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
453 inode->i_size = PAGE_CACHE_SIZE;
456 error = insert_inode_locked4(inode, hash, pvfs2_test_inode, ref);
460 gossip_debug(GOSSIP_INODE_DEBUG,
461 "Initializing ACL's for inode %pU\n",
462 get_khandle_from_ino(inode));
463 pvfs2_init_acl(inode, dir);
468 return ERR_PTR(error);