blob: 722e0d5ba182dcfc8f9a4501180b473d265799b2 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/libfs.c
3 * Library for filesystems writers.
4 */
5
6#include <linux/module.h>
7#include <linux/pagemap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/mount.h>
10#include <linux/vfs.h>
npiggin@suse.de7bb46a62010-05-27 01:05:33 +100011#include <linux/quotaops.h>
Ingo Molnar7cf34c72006-03-23 03:00:36 -080012#include <linux/mutex.h>
Christoph Hellwig25961102007-10-21 16:42:05 -070013#include <linux/exportfs.h>
Al Virod5aacad2009-06-07 14:56:44 -040014#include <linux/writeback.h>
Al Viroff01bb42011-09-16 02:31:11 -040015#include <linux/buffer_head.h> /* sync_mapping_buffers */
Ingo Molnar7cf34c72006-03-23 03:00:36 -080016
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <asm/uaccess.h>
18
Al Viroa4464db2011-07-07 15:03:58 -040019#include "internal.h"
20
Nick Pigginda502952011-01-07 17:49:33 +110021static inline int simple_positive(struct dentry *dentry)
22{
23 return dentry->d_inode && !d_unhashed(dentry);
24}
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026int simple_getattr(struct vfsmount *mnt, struct dentry *dentry,
27 struct kstat *stat)
28{
29 struct inode *inode = dentry->d_inode;
30 generic_fillattr(inode, stat);
31 stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9);
32 return 0;
33}
34
David Howells726c3342006-06-23 02:02:58 -070035int simple_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
David Howells726c3342006-06-23 02:02:58 -070037 buf->f_type = dentry->d_sb->s_magic;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 buf->f_bsize = PAGE_CACHE_SIZE;
39 buf->f_namelen = NAME_MAX;
40 return 0;
41}
42
43/*
44 * Retaining negative dentries for an in-memory filesystem just wastes
45 * memory and lookup time: arrange for them to be deleted immediately.
46 */
Nick Pigginfe15ce42011-01-07 17:49:23 +110047static int simple_delete_dentry(const struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048{
49 return 1;
50}
51
52/*
53 * Lookup the data. This is trivial - if the dentry didn't already
54 * exist, we know it is negative. Set d_op to delete negative dentries.
55 */
56struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
57{
Al Viro3ba13d12009-02-20 06:02:22 +000058 static const struct dentry_operations simple_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 .d_delete = simple_delete_dentry,
60 };
61
62 if (dentry->d_name.len > NAME_MAX)
63 return ERR_PTR(-ENAMETOOLONG);
Nick Pigginfb045ad2011-01-07 17:49:55 +110064 d_set_d_op(dentry, &simple_dentry_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 d_add(dentry, NULL);
66 return NULL;
67}
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069int dcache_dir_open(struct inode *inode, struct file *file)
70{
71 static struct qstr cursor_name = {.len = 1, .name = "."};
72
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -080073 file->private_data = d_alloc(file->f_path.dentry, &cursor_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75 return file->private_data ? 0 : -ENOMEM;
76}
77
78int dcache_dir_close(struct inode *inode, struct file *file)
79{
80 dput(file->private_data);
81 return 0;
82}
83
84loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
85{
Nick Piggin2fd6b7f2011-01-07 17:49:34 +110086 struct dentry *dentry = file->f_path.dentry;
87 mutex_lock(&dentry->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 switch (origin) {
89 case 1:
90 offset += file->f_pos;
91 case 0:
92 if (offset >= 0)
93 break;
94 default:
Nick Piggin2fd6b7f2011-01-07 17:49:34 +110095 mutex_unlock(&dentry->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return -EINVAL;
97 }
98 if (offset != file->f_pos) {
99 file->f_pos = offset;
100 if (file->f_pos >= 2) {
101 struct list_head *p;
102 struct dentry *cursor = file->private_data;
103 loff_t n = file->f_pos - 2;
104
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100105 spin_lock(&dentry->d_lock);
106 /* d_lock not required for cursor */
Eric Dumazet5160ee62006-01-08 01:03:32 -0800107 list_del(&cursor->d_u.d_child);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100108 p = dentry->d_subdirs.next;
109 while (n && p != &dentry->d_subdirs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 struct dentry *next;
Eric Dumazet5160ee62006-01-08 01:03:32 -0800111 next = list_entry(p, struct dentry, d_u.d_child);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100112 spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
Nick Pigginda502952011-01-07 17:49:33 +1100113 if (simple_positive(next))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 n--;
Nick Pigginda502952011-01-07 17:49:33 +1100115 spin_unlock(&next->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 p = p->next;
117 }
Eric Dumazet5160ee62006-01-08 01:03:32 -0800118 list_add_tail(&cursor->d_u.d_child, p);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100119 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 }
121 }
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100122 mutex_unlock(&dentry->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return offset;
124}
125
126/* Relationship between i_mode and the DT_xxx types */
127static inline unsigned char dt_type(struct inode *inode)
128{
129 return (inode->i_mode >> 12) & 15;
130}
131
132/*
133 * Directory is locked and all positive dentries in it are safe, since
134 * for ramfs-type trees they can't go away without unlink() or rmdir(),
135 * both impossible due to the lock on directory.
136 */
137
138int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
139{
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800140 struct dentry *dentry = filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 struct dentry *cursor = filp->private_data;
Eric Dumazet5160ee62006-01-08 01:03:32 -0800142 struct list_head *p, *q = &cursor->d_u.d_child;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 ino_t ino;
144 int i = filp->f_pos;
145
146 switch (i) {
147 case 0:
148 ino = dentry->d_inode->i_ino;
149 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
150 break;
151 filp->f_pos++;
152 i++;
153 /* fallthrough */
154 case 1:
155 ino = parent_ino(dentry);
156 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
157 break;
158 filp->f_pos++;
159 i++;
160 /* fallthrough */
161 default:
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100162 spin_lock(&dentry->d_lock);
Akinobu Mita1bfba4e2006-06-26 00:24:40 -0700163 if (filp->f_pos == 2)
164 list_move(q, &dentry->d_subdirs);
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
167 struct dentry *next;
Eric Dumazet5160ee62006-01-08 01:03:32 -0800168 next = list_entry(p, struct dentry, d_u.d_child);
Nick Pigginda502952011-01-07 17:49:33 +1100169 spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
170 if (!simple_positive(next)) {
171 spin_unlock(&next->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 continue;
Nick Pigginda502952011-01-07 17:49:33 +1100173 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Nick Pigginda502952011-01-07 17:49:33 +1100175 spin_unlock(&next->d_lock);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100176 spin_unlock(&dentry->d_lock);
Ronni Nielsen0f8952c22007-05-09 06:44:57 +0200177 if (filldir(dirent, next->d_name.name,
178 next->d_name.len, filp->f_pos,
179 next->d_inode->i_ino,
180 dt_type(next->d_inode)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return 0;
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100182 spin_lock(&dentry->d_lock);
183 spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 /* next is still alive */
Akinobu Mita1bfba4e2006-06-26 00:24:40 -0700185 list_move(q, p);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100186 spin_unlock(&next->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 p = q;
188 filp->f_pos++;
189 }
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100190 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 }
192 return 0;
193}
194
195ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos)
196{
197 return -EISDIR;
198}
199
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800200const struct file_operations simple_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 .open = dcache_dir_open,
202 .release = dcache_dir_close,
203 .llseek = dcache_dir_lseek,
204 .read = generic_read_dir,
205 .readdir = dcache_readdir,
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200206 .fsync = noop_fsync,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207};
208
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800209const struct inode_operations simple_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 .lookup = simple_lookup,
211};
212
Hugh Dickins759b9772007-03-05 00:30:28 -0800213static const struct super_operations simple_super_operations = {
214 .statfs = simple_statfs,
215};
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217/*
218 * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
219 * will never be mountable)
220 */
Al Viro51139ad2010-07-25 23:47:46 +0400221struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
Al Viroc74a1cb2011-01-12 16:59:34 -0500222 const struct super_operations *ops,
223 const struct dentry_operations *dops, unsigned long magic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct dentry *dentry;
227 struct inode *root;
228 struct qstr d_name = {.name = name, .len = strlen(name)};
229
230 if (IS_ERR(s))
Al Viro51139ad2010-07-25 23:47:46 +0400231 return ERR_CAST(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 s->s_flags = MS_NOUSER;
Jeff Layton89a4eb42009-08-18 14:11:08 -0700234 s->s_maxbytes = MAX_LFS_FILESIZE;
Alex Nixon3971e1a2008-07-29 22:33:03 -0700235 s->s_blocksize = PAGE_SIZE;
236 s->s_blocksize_bits = PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 s->s_magic = magic;
Hugh Dickins759b9772007-03-05 00:30:28 -0800238 s->s_op = ops ? ops : &simple_super_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 s->s_time_gran = 1;
240 root = new_inode(s);
241 if (!root)
242 goto Enomem;
Jeff Layton1a1c9bb2007-05-08 00:32:31 -0700243 /*
244 * since this is the first inode, make it number 1. New inodes created
245 * after this must take care not to collide with it (by passing
246 * max_reserved of 1 to iunique).
247 */
248 root->i_ino = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
Al Viroa4464db2011-07-07 15:03:58 -0400251 dentry = __d_alloc(s, &d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (!dentry) {
253 iput(root);
254 goto Enomem;
255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 d_instantiate(dentry, root);
257 s->s_root = dentry;
Al Viroc74a1cb2011-01-12 16:59:34 -0500258 s->s_d_op = dops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 s->s_flags |= MS_ACTIVE;
Al Viro51139ad2010-07-25 23:47:46 +0400260 return dget(s->s_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262Enomem:
Al Viro6f5bbff2009-05-06 01:34:22 -0400263 deactivate_locked_super(s);
Al Viro51139ad2010-07-25 23:47:46 +0400264 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
267int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
268{
269 struct inode *inode = old_dentry->d_inode;
270
271 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
Dave Hansend8c76e62006-09-30 23:29:04 -0700272 inc_nlink(inode);
Al Viro7de9c6e2010-10-23 11:11:40 -0400273 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 dget(dentry);
275 d_instantiate(dentry, inode);
276 return 0;
277}
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279int simple_empty(struct dentry *dentry)
280{
281 struct dentry *child;
282 int ret = 0;
283
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100284 spin_lock(&dentry->d_lock);
Nick Pigginda502952011-01-07 17:49:33 +1100285 list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) {
286 spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
287 if (simple_positive(child)) {
288 spin_unlock(&child->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 goto out;
Nick Pigginda502952011-01-07 17:49:33 +1100290 }
291 spin_unlock(&child->d_lock);
292 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 ret = 1;
294out:
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100295 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return ret;
297}
298
299int simple_unlink(struct inode *dir, struct dentry *dentry)
300{
301 struct inode *inode = dentry->d_inode;
302
303 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700304 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 dput(dentry);
306 return 0;
307}
308
309int simple_rmdir(struct inode *dir, struct dentry *dentry)
310{
311 if (!simple_empty(dentry))
312 return -ENOTEMPTY;
313
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700314 drop_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 simple_unlink(dir, dentry);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700316 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 return 0;
318}
319
320int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
321 struct inode *new_dir, struct dentry *new_dentry)
322{
323 struct inode *inode = old_dentry->d_inode;
324 int they_are_dirs = S_ISDIR(old_dentry->d_inode->i_mode);
325
326 if (!simple_empty(new_dentry))
327 return -ENOTEMPTY;
328
329 if (new_dentry->d_inode) {
330 simple_unlink(new_dir, new_dentry);
Al Viro841590c2011-07-21 15:49:09 -0400331 if (they_are_dirs) {
332 drop_nlink(new_dentry->d_inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700333 drop_nlink(old_dir);
Al Viro841590c2011-07-21 15:49:09 -0400334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 } else if (they_are_dirs) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700336 drop_nlink(old_dir);
Dave Hansend8c76e62006-09-30 23:29:04 -0700337 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339
340 old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
341 new_dir->i_mtime = inode->i_ctime = CURRENT_TIME;
342
343 return 0;
344}
345
npiggin@suse.de7bb46a62010-05-27 01:05:33 +1000346/**
Christoph Hellwigeef23802010-06-04 11:30:01 +0200347 * simple_setattr - setattr for simple filesystem
npiggin@suse.de7bb46a62010-05-27 01:05:33 +1000348 * @dentry: dentry
349 * @iattr: iattr structure
350 *
351 * Returns 0 on success, -error on failure.
352 *
Christoph Hellwigeef23802010-06-04 11:30:01 +0200353 * simple_setattr is a simple ->setattr implementation without a proper
354 * implementation of size changes.
355 *
356 * It can either be used for in-memory filesystems or special files
357 * on simple regular filesystems. Anything that needs to change on-disk
358 * or wire state on size changes needs its own setattr method.
npiggin@suse.de7bb46a62010-05-27 01:05:33 +1000359 */
360int simple_setattr(struct dentry *dentry, struct iattr *iattr)
361{
362 struct inode *inode = dentry->d_inode;
363 int error;
364
Christoph Hellwigeef23802010-06-04 11:30:01 +0200365 WARN_ON_ONCE(inode->i_op->truncate);
366
npiggin@suse.de7bb46a62010-05-27 01:05:33 +1000367 error = inode_change_ok(inode, iattr);
368 if (error)
369 return error;
370
Christoph Hellwig2c27c652010-06-04 11:30:04 +0200371 if (iattr->ia_valid & ATTR_SIZE)
372 truncate_setsize(inode, iattr->ia_size);
Christoph Hellwig6a1a90a2010-06-04 11:30:00 +0200373 setattr_copy(inode, iattr);
Christoph Hellwigeef23802010-06-04 11:30:01 +0200374 mark_inode_dirty(inode);
375 return 0;
npiggin@suse.de7bb46a62010-05-27 01:05:33 +1000376}
377EXPORT_SYMBOL(simple_setattr);
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379int simple_readpage(struct file *file, struct page *page)
380{
Pekka J Enbergc0d92cb2006-09-29 01:59:09 -0700381 clear_highpage(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 flush_dcache_page(page);
383 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 unlock_page(page);
385 return 0;
386}
387
Nick Pigginafddba42007-10-16 01:25:01 -0700388int simple_write_begin(struct file *file, struct address_space *mapping,
389 loff_t pos, unsigned len, unsigned flags,
390 struct page **pagep, void **fsdata)
391{
392 struct page *page;
393 pgoff_t index;
Nick Pigginafddba42007-10-16 01:25:01 -0700394
395 index = pos >> PAGE_CACHE_SHIFT;
Nick Pigginafddba42007-10-16 01:25:01 -0700396
Nick Piggin54566b22009-01-04 12:00:53 -0800397 page = grab_cache_page_write_begin(mapping, index, flags);
Nick Pigginafddba42007-10-16 01:25:01 -0700398 if (!page)
399 return -ENOMEM;
400
401 *pagep = page;
402
Boaz Harrosh193cf4b2010-01-12 16:18:08 +0200403 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
404 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
405
406 zero_user_segments(page, 0, from, from + len, PAGE_CACHE_SIZE);
407 }
408 return 0;
Nick Pigginafddba42007-10-16 01:25:01 -0700409}
410
Boaz Harroshad2a722f2010-01-12 15:13:47 +0200411/**
412 * simple_write_end - .write_end helper for non-block-device FSes
413 * @available: See .write_end of address_space_operations
414 * @file: "
415 * @mapping: "
416 * @pos: "
417 * @len: "
418 * @copied: "
419 * @page: "
420 * @fsdata: "
421 *
422 * simple_write_end does the minimum needed for updating a page after writing is
423 * done. It has the same API signature as the .write_end of
424 * address_space_operations vector. So it can just be set onto .write_end for
425 * FSes that don't need any other processing. i_mutex is assumed to be held.
426 * Block based filesystems should use generic_write_end().
427 * NOTE: Even though i_size might get updated by this function, mark_inode_dirty
428 * is not called, so a filesystem that actually does store data in .write_inode
429 * should extend on what's done here with a call to mark_inode_dirty() in the
430 * case that i_size has changed.
431 */
432int simple_write_end(struct file *file, struct address_space *mapping,
433 loff_t pos, unsigned len, unsigned copied,
434 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
436 struct inode *inode = page->mapping->host;
Boaz Harroshad2a722f2010-01-12 15:13:47 +0200437 loff_t last_pos = pos + copied;
438
439 /* zero the stale part of the page if we did a short copy */
440 if (copied < len) {
441 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
442
443 zero_user(page, from + copied, len - copied);
444 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Nick Piggin955eff52007-02-20 13:58:08 -0800446 if (!PageUptodate(page))
447 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 /*
449 * No need to use i_size_read() here, the i_size
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800450 * cannot change under us because we hold the i_mutex.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 */
Boaz Harroshad2a722f2010-01-12 15:13:47 +0200452 if (last_pos > inode->i_size)
453 i_size_write(inode, last_pos);
454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 set_page_dirty(page);
Nick Pigginafddba42007-10-16 01:25:01 -0700456 unlock_page(page);
457 page_cache_release(page);
458
459 return copied;
460}
461
Jeff Layton1a1c9bb2007-05-08 00:32:31 -0700462/*
463 * the inodes created here are not hashed. If you use iunique to generate
464 * unique inode values later for this filesystem, then you must take care
465 * to pass it an appropriate max_reserved value to avoid collisions.
466 */
Roberto Sassu7d683a02010-06-03 11:58:28 +0200467int simple_fill_super(struct super_block *s, unsigned long magic,
468 struct tree_descr *files)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 struct inode *inode;
471 struct dentry *root;
472 struct dentry *dentry;
473 int i;
474
475 s->s_blocksize = PAGE_CACHE_SIZE;
476 s->s_blocksize_bits = PAGE_CACHE_SHIFT;
477 s->s_magic = magic;
Hugh Dickins759b9772007-03-05 00:30:28 -0800478 s->s_op = &simple_super_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 s->s_time_gran = 1;
480
481 inode = new_inode(s);
482 if (!inode)
483 return -ENOMEM;
Jeff Layton1a1c9bb2007-05-08 00:32:31 -0700484 /*
485 * because the root inode is 1, the files array must not contain an
486 * entry at index 1
487 */
488 inode->i_ino = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 inode->i_mode = S_IFDIR | 0755;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
491 inode->i_op = &simple_dir_inode_operations;
492 inode->i_fop = &simple_dir_operations;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200493 set_nlink(inode, 2);
Al Viro48fde702012-01-08 22:15:13 -0500494 root = d_make_root(inode);
495 if (!root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 for (i = 0; !files->name || files->name[0]; i++, files++) {
498 if (!files->name)
499 continue;
Jeff Layton1a1c9bb2007-05-08 00:32:31 -0700500
501 /* warn if it tries to conflict with the root inode */
502 if (unlikely(i == 1))
503 printk(KERN_WARNING "%s: %s passed in a files array"
504 "with an index of 1!\n", __func__,
505 s->s_type->name);
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 dentry = d_alloc_name(root, files->name);
508 if (!dentry)
509 goto out;
510 inode = new_inode(s);
Konstantin Khlebnikov32096ea2011-11-01 16:12:33 +0300511 if (!inode) {
512 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 goto out;
Konstantin Khlebnikov32096ea2011-11-01 16:12:33 +0300514 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 inode->i_mode = S_IFREG | files->mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
517 inode->i_fop = files->ops;
518 inode->i_ino = i;
519 d_add(dentry, inode);
520 }
521 s->s_root = root;
522 return 0;
523out:
524 d_genocide(root);
525 dput(root);
526 return -ENOMEM;
527}
528
529static DEFINE_SPINLOCK(pin_fs_lock);
530
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -0400531int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
533 struct vfsmount *mnt = NULL;
534 spin_lock(&pin_fs_lock);
535 if (unlikely(!*mount)) {
536 spin_unlock(&pin_fs_lock);
Al Viro24529922012-03-17 02:13:52 -0400537 mnt = vfs_kern_mount(type, MS_KERNMOUNT, type->name, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (IS_ERR(mnt))
539 return PTR_ERR(mnt);
540 spin_lock(&pin_fs_lock);
541 if (!*mount)
542 *mount = mnt;
543 }
544 mntget(*mount);
545 ++*count;
546 spin_unlock(&pin_fs_lock);
547 mntput(mnt);
548 return 0;
549}
550
551void simple_release_fs(struct vfsmount **mount, int *count)
552{
553 struct vfsmount *mnt;
554 spin_lock(&pin_fs_lock);
555 mnt = *mount;
556 if (!--*count)
557 *mount = NULL;
558 spin_unlock(&pin_fs_lock);
559 mntput(mnt);
560}
561
Akinobu Mita6d1029b2008-07-04 09:59:51 -0700562/**
563 * simple_read_from_buffer - copy data from the buffer to user space
564 * @to: the user space buffer to read to
565 * @count: the maximum number of bytes to read
566 * @ppos: the current position in the buffer
567 * @from: the buffer to read from
568 * @available: the size of the buffer
569 *
570 * The simple_read_from_buffer() function reads up to @count bytes from the
571 * buffer @from at offset @ppos into the user space address starting at @to.
572 *
573 * On success, the number of bytes read is returned and the offset @ppos is
574 * advanced by this number, or negative value is returned on error.
575 **/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
577 const void *from, size_t available)
578{
579 loff_t pos = *ppos;
Steven Rostedt14be2742009-09-18 13:05:42 -0700580 size_t ret;
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 if (pos < 0)
583 return -EINVAL;
Steven Rostedt14be2742009-09-18 13:05:42 -0700584 if (pos >= available || !count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 return 0;
586 if (count > available - pos)
587 count = available - pos;
Steven Rostedt14be2742009-09-18 13:05:42 -0700588 ret = copy_to_user(to, from + pos, count);
589 if (ret == count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return -EFAULT;
Steven Rostedt14be2742009-09-18 13:05:42 -0700591 count -= ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 *ppos = pos + count;
593 return count;
594}
595
Akinobu Mita6d1029b2008-07-04 09:59:51 -0700596/**
Jiri Slaby6a727b42010-05-01 23:51:22 +0200597 * simple_write_to_buffer - copy data from user space to the buffer
598 * @to: the buffer to write to
599 * @available: the size of the buffer
600 * @ppos: the current position in the buffer
601 * @from: the user space buffer to read from
602 * @count: the maximum number of bytes to read
603 *
604 * The simple_write_to_buffer() function reads up to @count bytes from the user
605 * space address starting at @from into the buffer @to at offset @ppos.
606 *
607 * On success, the number of bytes written is returned and the offset @ppos is
608 * advanced by this number, or negative value is returned on error.
609 **/
610ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
611 const void __user *from, size_t count)
612{
613 loff_t pos = *ppos;
614 size_t res;
615
616 if (pos < 0)
617 return -EINVAL;
618 if (pos >= available || !count)
619 return 0;
620 if (count > available - pos)
621 count = available - pos;
622 res = copy_from_user(to + pos, from, count);
623 if (res == count)
624 return -EFAULT;
625 count -= res;
626 *ppos = pos + count;
627 return count;
628}
629
630/**
Akinobu Mita6d1029b2008-07-04 09:59:51 -0700631 * memory_read_from_buffer - copy data from the buffer
632 * @to: the kernel space buffer to read to
633 * @count: the maximum number of bytes to read
634 * @ppos: the current position in the buffer
635 * @from: the buffer to read from
636 * @available: the size of the buffer
637 *
638 * The memory_read_from_buffer() function reads up to @count bytes from the
639 * buffer @from at offset @ppos into the kernel space address starting at @to.
640 *
641 * On success, the number of bytes read is returned and the offset @ppos is
642 * advanced by this number, or negative value is returned on error.
643 **/
Akinobu Mita93b07112008-06-05 22:46:21 -0700644ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
645 const void *from, size_t available)
646{
647 loff_t pos = *ppos;
648
649 if (pos < 0)
650 return -EINVAL;
651 if (pos >= available)
652 return 0;
653 if (count > available - pos)
654 count = available - pos;
655 memcpy(to, from + pos, count);
656 *ppos = pos + count;
657
658 return count;
659}
660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661/*
662 * Transaction based IO.
663 * The file expects a single write which triggers the transaction, and then
664 * possibly a read which collects the result - which is stored in a
665 * file-local buffer.
666 */
Ingo Molnar76791ab2009-03-25 16:48:35 +0100667
668void simple_transaction_set(struct file *file, size_t n)
669{
670 struct simple_transaction_argresp *ar = file->private_data;
671
672 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
673
674 /*
675 * The barrier ensures that ar->size will really remain zero until
676 * ar->data is ready for reading.
677 */
678 smp_mb();
679 ar->size = n;
680}
681
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682char *simple_transaction_get(struct file *file, const char __user *buf, size_t size)
683{
684 struct simple_transaction_argresp *ar;
685 static DEFINE_SPINLOCK(simple_transaction_lock);
686
687 if (size > SIMPLE_TRANSACTION_LIMIT - 1)
688 return ERR_PTR(-EFBIG);
689
690 ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL);
691 if (!ar)
692 return ERR_PTR(-ENOMEM);
693
694 spin_lock(&simple_transaction_lock);
695
696 /* only one write allowed per open */
697 if (file->private_data) {
698 spin_unlock(&simple_transaction_lock);
699 free_page((unsigned long)ar);
700 return ERR_PTR(-EBUSY);
701 }
702
703 file->private_data = ar;
704
705 spin_unlock(&simple_transaction_lock);
706
707 if (copy_from_user(ar->data, buf, size))
708 return ERR_PTR(-EFAULT);
709
710 return ar->data;
711}
712
713ssize_t simple_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
714{
715 struct simple_transaction_argresp *ar = file->private_data;
716
717 if (!ar)
718 return 0;
719 return simple_read_from_buffer(buf, size, pos, ar->data, ar->size);
720}
721
722int simple_transaction_release(struct inode *inode, struct file *file)
723{
724 free_page((unsigned long)file->private_data);
725 return 0;
726}
727
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200728/* Simple attribute files */
729
730struct simple_attr {
Christoph Hellwig8b88b092008-02-08 04:20:26 -0800731 int (*get)(void *, u64 *);
732 int (*set)(void *, u64);
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200733 char get_buf[24]; /* enough to store a u64 and "\n\0" */
734 char set_buf[24];
735 void *data;
736 const char *fmt; /* format for read operation */
Ingo Molnar7cf34c72006-03-23 03:00:36 -0800737 struct mutex mutex; /* protects access to these buffers */
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200738};
739
740/* simple_attr_open is called by an actual attribute open file operation
741 * to set the attribute specific access operations. */
742int simple_attr_open(struct inode *inode, struct file *file,
Christoph Hellwig8b88b092008-02-08 04:20:26 -0800743 int (*get)(void *, u64 *), int (*set)(void *, u64),
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200744 const char *fmt)
745{
746 struct simple_attr *attr;
747
748 attr = kmalloc(sizeof(*attr), GFP_KERNEL);
749 if (!attr)
750 return -ENOMEM;
751
752 attr->get = get;
753 attr->set = set;
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700754 attr->data = inode->i_private;
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200755 attr->fmt = fmt;
Ingo Molnar7cf34c72006-03-23 03:00:36 -0800756 mutex_init(&attr->mutex);
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200757
758 file->private_data = attr;
759
760 return nonseekable_open(inode, file);
761}
762
Christoph Hellwig74bedc42008-02-08 04:20:28 -0800763int simple_attr_release(struct inode *inode, struct file *file)
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200764{
765 kfree(file->private_data);
766 return 0;
767}
768
769/* read from the buffer that is filled with the get function */
770ssize_t simple_attr_read(struct file *file, char __user *buf,
771 size_t len, loff_t *ppos)
772{
773 struct simple_attr *attr;
774 size_t size;
775 ssize_t ret;
776
777 attr = file->private_data;
778
779 if (!attr->get)
780 return -EACCES;
781
Christoph Hellwig92613032008-02-08 04:20:27 -0800782 ret = mutex_lock_interruptible(&attr->mutex);
783 if (ret)
784 return ret;
785
Christoph Hellwig8b88b092008-02-08 04:20:26 -0800786 if (*ppos) { /* continued read */
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200787 size = strlen(attr->get_buf);
Christoph Hellwig8b88b092008-02-08 04:20:26 -0800788 } else { /* first read */
789 u64 val;
790 ret = attr->get(attr->data, &val);
791 if (ret)
792 goto out;
793
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200794 size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
Christoph Hellwig8b88b092008-02-08 04:20:26 -0800795 attr->fmt, (unsigned long long)val);
796 }
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200797
798 ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
Christoph Hellwig8b88b092008-02-08 04:20:26 -0800799out:
Ingo Molnar7cf34c72006-03-23 03:00:36 -0800800 mutex_unlock(&attr->mutex);
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200801 return ret;
802}
803
804/* interpret the buffer as a number to call the set function with */
805ssize_t simple_attr_write(struct file *file, const char __user *buf,
806 size_t len, loff_t *ppos)
807{
808 struct simple_attr *attr;
809 u64 val;
810 size_t size;
811 ssize_t ret;
812
813 attr = file->private_data;
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200814 if (!attr->set)
815 return -EACCES;
816
Christoph Hellwig92613032008-02-08 04:20:27 -0800817 ret = mutex_lock_interruptible(&attr->mutex);
818 if (ret)
819 return ret;
820
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200821 ret = -EFAULT;
822 size = min(sizeof(attr->set_buf) - 1, len);
823 if (copy_from_user(attr->set_buf, buf, size))
824 goto out;
825
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200826 attr->set_buf[size] = '\0';
Akinobu Mitaf7b88632011-07-19 08:49:25 -0700827 val = simple_strtoll(attr->set_buf, NULL, 0);
Wu Fengguang05cc0ce2009-09-18 13:06:03 -0700828 ret = attr->set(attr->data, val);
829 if (ret == 0)
830 ret = len; /* on success, claim we got the whole input */
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200831out:
Ingo Molnar7cf34c72006-03-23 03:00:36 -0800832 mutex_unlock(&attr->mutex);
Arnd Bergmannacaefc22005-05-18 14:40:59 +0200833 return ret;
834}
835
Christoph Hellwig25961102007-10-21 16:42:05 -0700836/**
837 * generic_fh_to_dentry - generic helper for the fh_to_dentry export operation
838 * @sb: filesystem to do the file handle conversion on
839 * @fid: file handle to convert
840 * @fh_len: length of the file handle in bytes
841 * @fh_type: type of file handle
842 * @get_inode: filesystem callback to retrieve inode
843 *
844 * This function decodes @fid as long as it has one of the well-known
845 * Linux filehandle types and calls @get_inode on it to retrieve the
846 * inode for the object specified in the file handle.
847 */
848struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid,
849 int fh_len, int fh_type, struct inode *(*get_inode)
850 (struct super_block *sb, u64 ino, u32 gen))
851{
852 struct inode *inode = NULL;
853
854 if (fh_len < 2)
855 return NULL;
856
857 switch (fh_type) {
858 case FILEID_INO32_GEN:
859 case FILEID_INO32_GEN_PARENT:
860 inode = get_inode(sb, fid->i32.ino, fid->i32.gen);
861 break;
862 }
863
Christoph Hellwig4ea3ada2008-08-11 15:48:57 +0200864 return d_obtain_alias(inode);
Christoph Hellwig25961102007-10-21 16:42:05 -0700865}
866EXPORT_SYMBOL_GPL(generic_fh_to_dentry);
867
868/**
869 * generic_fh_to_dentry - generic helper for the fh_to_parent export operation
870 * @sb: filesystem to do the file handle conversion on
871 * @fid: file handle to convert
872 * @fh_len: length of the file handle in bytes
873 * @fh_type: type of file handle
874 * @get_inode: filesystem callback to retrieve inode
875 *
876 * This function decodes @fid as long as it has one of the well-known
877 * Linux filehandle types and calls @get_inode on it to retrieve the
878 * inode for the _parent_ object specified in the file handle if it
879 * is specified in the file handle, or NULL otherwise.
880 */
881struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid,
882 int fh_len, int fh_type, struct inode *(*get_inode)
883 (struct super_block *sb, u64 ino, u32 gen))
884{
885 struct inode *inode = NULL;
886
887 if (fh_len <= 2)
888 return NULL;
889
890 switch (fh_type) {
891 case FILEID_INO32_GEN_PARENT:
892 inode = get_inode(sb, fid->i32.parent_ino,
893 (fh_len > 3 ? fid->i32.parent_gen : 0));
894 break;
895 }
896
Christoph Hellwig4ea3ada2008-08-11 15:48:57 +0200897 return d_obtain_alias(inode);
Christoph Hellwig25961102007-10-21 16:42:05 -0700898}
899EXPORT_SYMBOL_GPL(generic_fh_to_parent);
900
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200901/**
902 * generic_file_fsync - generic fsync implementation for simple filesystems
903 * @file: file to synchronize
904 * @datasync: only synchronize essential metadata if true
905 *
906 * This is a generic implementation of the fsync method for simple
907 * filesystems which track all non-inode metadata in the buffers list
908 * hanging off the address_space structure.
909 */
Josef Bacik02c24a82011-07-16 20:44:56 -0400910int generic_file_fsync(struct file *file, loff_t start, loff_t end,
911 int datasync)
Al Virod5aacad2009-06-07 14:56:44 -0400912{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200913 struct inode *inode = file->f_mapping->host;
Al Virod5aacad2009-06-07 14:56:44 -0400914 int err;
915 int ret;
916
Josef Bacik02c24a82011-07-16 20:44:56 -0400917 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
918 if (err)
919 return err;
920
921 mutex_lock(&inode->i_mutex);
Al Virod5aacad2009-06-07 14:56:44 -0400922 ret = sync_mapping_buffers(inode->i_mapping);
923 if (!(inode->i_state & I_DIRTY))
Josef Bacik02c24a82011-07-16 20:44:56 -0400924 goto out;
Al Virod5aacad2009-06-07 14:56:44 -0400925 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
Josef Bacik02c24a82011-07-16 20:44:56 -0400926 goto out;
Al Virod5aacad2009-06-07 14:56:44 -0400927
Christoph Hellwigc3765012010-10-06 10:48:20 +0200928 err = sync_inode_metadata(inode, 1);
Al Virod5aacad2009-06-07 14:56:44 -0400929 if (ret == 0)
930 ret = err;
Josef Bacik02c24a82011-07-16 20:44:56 -0400931out:
932 mutex_unlock(&inode->i_mutex);
Al Virod5aacad2009-06-07 14:56:44 -0400933 return ret;
934}
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200935EXPORT_SYMBOL(generic_file_fsync);
936
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -0700937/**
938 * generic_check_addressable - Check addressability of file system
939 * @blocksize_bits: log of file system block size
940 * @num_blocks: number of blocks in file system
941 *
942 * Determine whether a file system with @num_blocks blocks (and a
943 * block size of 2**@blocksize_bits) is addressable by the sector_t
944 * and page cache of the system. Return 0 if so and -EFBIG otherwise.
945 */
946int generic_check_addressable(unsigned blocksize_bits, u64 num_blocks)
947{
948 u64 last_fs_block = num_blocks - 1;
Joel Beckera33f13e2010-08-16 12:10:17 -0700949 u64 last_fs_page =
950 last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits);
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -0700951
952 if (unlikely(num_blocks == 0))
953 return 0;
954
955 if ((blocksize_bits < 9) || (blocksize_bits > PAGE_CACHE_SHIFT))
956 return -EINVAL;
957
Joel Beckera33f13e2010-08-16 12:10:17 -0700958 if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) ||
959 (last_fs_page > (pgoff_t)(~0ULL))) {
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -0700960 return -EFBIG;
961 }
962 return 0;
963}
964EXPORT_SYMBOL(generic_check_addressable);
965
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200966/*
967 * No-op implementation of ->fsync for in-memory filesystems.
968 */
Josef Bacik02c24a82011-07-16 20:44:56 -0400969int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200970{
971 return 0;
972}
Al Virod5aacad2009-06-07 14:56:44 -0400973
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974EXPORT_SYMBOL(dcache_dir_close);
975EXPORT_SYMBOL(dcache_dir_lseek);
976EXPORT_SYMBOL(dcache_dir_open);
977EXPORT_SYMBOL(dcache_readdir);
978EXPORT_SYMBOL(generic_read_dir);
Al Viro51139ad2010-07-25 23:47:46 +0400979EXPORT_SYMBOL(mount_pseudo);
Nick Pigginafddba42007-10-16 01:25:01 -0700980EXPORT_SYMBOL(simple_write_begin);
981EXPORT_SYMBOL(simple_write_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982EXPORT_SYMBOL(simple_dir_inode_operations);
983EXPORT_SYMBOL(simple_dir_operations);
984EXPORT_SYMBOL(simple_empty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985EXPORT_SYMBOL(simple_fill_super);
986EXPORT_SYMBOL(simple_getattr);
987EXPORT_SYMBOL(simple_link);
988EXPORT_SYMBOL(simple_lookup);
989EXPORT_SYMBOL(simple_pin_fs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990EXPORT_SYMBOL(simple_readpage);
991EXPORT_SYMBOL(simple_release_fs);
992EXPORT_SYMBOL(simple_rename);
993EXPORT_SYMBOL(simple_rmdir);
994EXPORT_SYMBOL(simple_statfs);
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200995EXPORT_SYMBOL(noop_fsync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996EXPORT_SYMBOL(simple_unlink);
997EXPORT_SYMBOL(simple_read_from_buffer);
Jiri Slaby6a727b42010-05-01 23:51:22 +0200998EXPORT_SYMBOL(simple_write_to_buffer);
Akinobu Mita93b07112008-06-05 22:46:21 -0700999EXPORT_SYMBOL(memory_read_from_buffer);
Ingo Molnar76791ab2009-03-25 16:48:35 +01001000EXPORT_SYMBOL(simple_transaction_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001EXPORT_SYMBOL(simple_transaction_get);
1002EXPORT_SYMBOL(simple_transaction_read);
1003EXPORT_SYMBOL(simple_transaction_release);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02001004EXPORT_SYMBOL_GPL(simple_attr_open);
Christoph Hellwig74bedc42008-02-08 04:20:28 -08001005EXPORT_SYMBOL_GPL(simple_attr_release);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02001006EXPORT_SYMBOL_GPL(simple_attr_read);
1007EXPORT_SYMBOL_GPL(simple_attr_write);