3 * Library for filesystems writers.
6 #include <linux/module.h>
7 #include <linux/pagemap.h>
8 #include <linux/slab.h>
9 #include <linux/mount.h>
10 #include <linux/vfs.h>
11 #include <linux/quotaops.h>
12 #include <linux/mutex.h>
13 #include <linux/exportfs.h>
14 #include <linux/writeback.h>
15 #include <linux/buffer_head.h>
17 #include <asm/uaccess.h>
19 static inline int simple_positive(struct dentry *dentry)
21 return dentry->d_inode && !d_unhashed(dentry);
24 int simple_getattr(struct vfsmount *mnt, struct dentry *dentry,
27 struct inode *inode = dentry->d_inode;
28 generic_fillattr(inode, stat);
29 stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9);
33 int simple_statfs(struct dentry *dentry, struct kstatfs *buf)
35 buf->f_type = dentry->d_sb->s_magic;
36 buf->f_bsize = PAGE_CACHE_SIZE;
37 buf->f_namelen = NAME_MAX;
42 * Retaining negative dentries for an in-memory filesystem just wastes
43 * memory and lookup time: arrange for them to be deleted immediately.
45 static int simple_delete_dentry(const struct dentry *dentry)
51 * Lookup the data. This is trivial - if the dentry didn't already
52 * exist, we know it is negative. Set d_op to delete negative dentries.
54 struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
56 static const struct dentry_operations simple_dentry_operations = {
57 .d_delete = simple_delete_dentry,
60 if (dentry->d_name.len > NAME_MAX)
61 return ERR_PTR(-ENAMETOOLONG);
62 dentry->d_op = &simple_dentry_operations;
67 int dcache_dir_open(struct inode *inode, struct file *file)
69 static struct qstr cursor_name = {.len = 1, .name = "."};
71 file->private_data = d_alloc(file->f_path.dentry, &cursor_name);
73 return file->private_data ? 0 : -ENOMEM;
76 int dcache_dir_close(struct inode *inode, struct file *file)
78 dput(file->private_data);
82 loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
84 mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
87 offset += file->f_pos;
92 mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
95 if (offset != file->f_pos) {
97 if (file->f_pos >= 2) {
99 struct dentry *cursor = file->private_data;
100 loff_t n = file->f_pos - 2;
102 spin_lock(&dcache_lock);
103 list_del(&cursor->d_u.d_child);
104 p = file->f_path.dentry->d_subdirs.next;
105 while (n && p != &file->f_path.dentry->d_subdirs) {
107 next = list_entry(p, struct dentry, d_u.d_child);
108 spin_lock(&next->d_lock);
109 if (simple_positive(next))
111 spin_unlock(&next->d_lock);
114 list_add_tail(&cursor->d_u.d_child, p);
115 spin_unlock(&dcache_lock);
118 mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
122 /* Relationship between i_mode and the DT_xxx types */
123 static inline unsigned char dt_type(struct inode *inode)
125 return (inode->i_mode >> 12) & 15;
129 * Directory is locked and all positive dentries in it are safe, since
130 * for ramfs-type trees they can't go away without unlink() or rmdir(),
131 * both impossible due to the lock on directory.
134 int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
136 struct dentry *dentry = filp->f_path.dentry;
137 struct dentry *cursor = filp->private_data;
138 struct list_head *p, *q = &cursor->d_u.d_child;
144 ino = dentry->d_inode->i_ino;
145 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
151 ino = parent_ino(dentry);
152 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
158 spin_lock(&dcache_lock);
159 if (filp->f_pos == 2)
160 list_move(q, &dentry->d_subdirs);
162 for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
164 next = list_entry(p, struct dentry, d_u.d_child);
165 spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
166 if (!simple_positive(next)) {
167 spin_unlock(&next->d_lock);
171 spin_unlock(&next->d_lock);
172 spin_unlock(&dcache_lock);
173 if (filldir(dirent, next->d_name.name,
174 next->d_name.len, filp->f_pos,
175 next->d_inode->i_ino,
176 dt_type(next->d_inode)) < 0)
178 spin_lock(&dcache_lock);
179 /* next is still alive */
184 spin_unlock(&dcache_lock);
189 ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos)
194 const struct file_operations simple_dir_operations = {
195 .open = dcache_dir_open,
196 .release = dcache_dir_close,
197 .llseek = dcache_dir_lseek,
198 .read = generic_read_dir,
199 .readdir = dcache_readdir,
203 const struct inode_operations simple_dir_inode_operations = {
204 .lookup = simple_lookup,
207 static const struct super_operations simple_super_operations = {
208 .statfs = simple_statfs,
212 * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
213 * will never be mountable)
215 struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
216 const struct super_operations *ops, unsigned long magic)
218 struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
219 struct dentry *dentry;
221 struct qstr d_name = {.name = name, .len = strlen(name)};
226 s->s_flags = MS_NOUSER;
227 s->s_maxbytes = MAX_LFS_FILESIZE;
228 s->s_blocksize = PAGE_SIZE;
229 s->s_blocksize_bits = PAGE_SHIFT;
231 s->s_op = ops ? ops : &simple_super_operations;
237 * since this is the first inode, make it number 1. New inodes created
238 * after this must take care not to collide with it (by passing
239 * max_reserved of 1 to iunique).
242 root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
243 root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
244 dentry = d_alloc(NULL, &d_name);
250 dentry->d_parent = dentry;
251 d_instantiate(dentry, root);
253 s->s_flags |= MS_ACTIVE;
254 return dget(s->s_root);
257 deactivate_locked_super(s);
258 return ERR_PTR(-ENOMEM);
261 int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
263 struct inode *inode = old_dentry->d_inode;
265 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
269 d_instantiate(dentry, inode);
273 int simple_empty(struct dentry *dentry)
275 struct dentry *child;
278 spin_lock(&dcache_lock);
279 list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) {
280 spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
281 if (simple_positive(child)) {
282 spin_unlock(&child->d_lock);
285 spin_unlock(&child->d_lock);
289 spin_unlock(&dcache_lock);
293 int simple_unlink(struct inode *dir, struct dentry *dentry)
295 struct inode *inode = dentry->d_inode;
297 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
303 int simple_rmdir(struct inode *dir, struct dentry *dentry)
305 if (!simple_empty(dentry))
308 drop_nlink(dentry->d_inode);
309 simple_unlink(dir, dentry);
314 int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
315 struct inode *new_dir, struct dentry *new_dentry)
317 struct inode *inode = old_dentry->d_inode;
318 int they_are_dirs = S_ISDIR(old_dentry->d_inode->i_mode);
320 if (!simple_empty(new_dentry))
323 if (new_dentry->d_inode) {
324 simple_unlink(new_dir, new_dentry);
327 } else if (they_are_dirs) {
332 old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
333 new_dir->i_mtime = inode->i_ctime = CURRENT_TIME;
339 * simple_setattr - setattr for simple filesystem
341 * @iattr: iattr structure
343 * Returns 0 on success, -error on failure.
345 * simple_setattr is a simple ->setattr implementation without a proper
346 * implementation of size changes.
348 * It can either be used for in-memory filesystems or special files
349 * on simple regular filesystems. Anything that needs to change on-disk
350 * or wire state on size changes needs its own setattr method.
352 int simple_setattr(struct dentry *dentry, struct iattr *iattr)
354 struct inode *inode = dentry->d_inode;
357 WARN_ON_ONCE(inode->i_op->truncate);
359 error = inode_change_ok(inode, iattr);
363 if (iattr->ia_valid & ATTR_SIZE)
364 truncate_setsize(inode, iattr->ia_size);
365 setattr_copy(inode, iattr);
366 mark_inode_dirty(inode);
369 EXPORT_SYMBOL(simple_setattr);
371 int simple_readpage(struct file *file, struct page *page)
373 clear_highpage(page);
374 flush_dcache_page(page);
375 SetPageUptodate(page);
380 int simple_write_begin(struct file *file, struct address_space *mapping,
381 loff_t pos, unsigned len, unsigned flags,
382 struct page **pagep, void **fsdata)
387 index = pos >> PAGE_CACHE_SHIFT;
389 page = grab_cache_page_write_begin(mapping, index, flags);
395 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
396 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
398 zero_user_segments(page, 0, from, from + len, PAGE_CACHE_SIZE);
404 * simple_write_end - .write_end helper for non-block-device FSes
405 * @available: See .write_end of address_space_operations
414 * simple_write_end does the minimum needed for updating a page after writing is
415 * done. It has the same API signature as the .write_end of
416 * address_space_operations vector. So it can just be set onto .write_end for
417 * FSes that don't need any other processing. i_mutex is assumed to be held.
418 * Block based filesystems should use generic_write_end().
419 * NOTE: Even though i_size might get updated by this function, mark_inode_dirty
420 * is not called, so a filesystem that actually does store data in .write_inode
421 * should extend on what's done here with a call to mark_inode_dirty() in the
422 * case that i_size has changed.
424 int simple_write_end(struct file *file, struct address_space *mapping,
425 loff_t pos, unsigned len, unsigned copied,
426 struct page *page, void *fsdata)
428 struct inode *inode = page->mapping->host;
429 loff_t last_pos = pos + copied;
431 /* zero the stale part of the page if we did a short copy */
433 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
435 zero_user(page, from + copied, len - copied);
438 if (!PageUptodate(page))
439 SetPageUptodate(page);
441 * No need to use i_size_read() here, the i_size
442 * cannot change under us because we hold the i_mutex.
444 if (last_pos > inode->i_size)
445 i_size_write(inode, last_pos);
447 set_page_dirty(page);
449 page_cache_release(page);
455 * the inodes created here are not hashed. If you use iunique to generate
456 * unique inode values later for this filesystem, then you must take care
457 * to pass it an appropriate max_reserved value to avoid collisions.
459 int simple_fill_super(struct super_block *s, unsigned long magic,
460 struct tree_descr *files)
464 struct dentry *dentry;
467 s->s_blocksize = PAGE_CACHE_SIZE;
468 s->s_blocksize_bits = PAGE_CACHE_SHIFT;
470 s->s_op = &simple_super_operations;
473 inode = new_inode(s);
477 * because the root inode is 1, the files array must not contain an
481 inode->i_mode = S_IFDIR | 0755;
482 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
483 inode->i_op = &simple_dir_inode_operations;
484 inode->i_fop = &simple_dir_operations;
486 root = d_alloc_root(inode);
491 for (i = 0; !files->name || files->name[0]; i++, files++) {
495 /* warn if it tries to conflict with the root inode */
496 if (unlikely(i == 1))
497 printk(KERN_WARNING "%s: %s passed in a files array"
498 "with an index of 1!\n", __func__,
501 dentry = d_alloc_name(root, files->name);
504 inode = new_inode(s);
507 inode->i_mode = S_IFREG | files->mode;
508 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
509 inode->i_fop = files->ops;
511 d_add(dentry, inode);
521 static DEFINE_SPINLOCK(pin_fs_lock);
523 int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count)
525 struct vfsmount *mnt = NULL;
526 spin_lock(&pin_fs_lock);
527 if (unlikely(!*mount)) {
528 spin_unlock(&pin_fs_lock);
529 mnt = vfs_kern_mount(type, 0, type->name, NULL);
532 spin_lock(&pin_fs_lock);
538 spin_unlock(&pin_fs_lock);
543 void simple_release_fs(struct vfsmount **mount, int *count)
545 struct vfsmount *mnt;
546 spin_lock(&pin_fs_lock);
550 spin_unlock(&pin_fs_lock);
555 * simple_read_from_buffer - copy data from the buffer to user space
556 * @to: the user space buffer to read to
557 * @count: the maximum number of bytes to read
558 * @ppos: the current position in the buffer
559 * @from: the buffer to read from
560 * @available: the size of the buffer
562 * The simple_read_from_buffer() function reads up to @count bytes from the
563 * buffer @from at offset @ppos into the user space address starting at @to.
565 * On success, the number of bytes read is returned and the offset @ppos is
566 * advanced by this number, or negative value is returned on error.
568 ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
569 const void *from, size_t available)
576 if (pos >= available || !count)
578 if (count > available - pos)
579 count = available - pos;
580 ret = copy_to_user(to, from + pos, count);
589 * simple_write_to_buffer - copy data from user space to the buffer
590 * @to: the buffer to write to
591 * @available: the size of the buffer
592 * @ppos: the current position in the buffer
593 * @from: the user space buffer to read from
594 * @count: the maximum number of bytes to read
596 * The simple_write_to_buffer() function reads up to @count bytes from the user
597 * space address starting at @from into the buffer @to at offset @ppos.
599 * On success, the number of bytes written is returned and the offset @ppos is
600 * advanced by this number, or negative value is returned on error.
602 ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
603 const void __user *from, size_t count)
610 if (pos >= available || !count)
612 if (count > available - pos)
613 count = available - pos;
614 res = copy_from_user(to + pos, from, count);
623 * memory_read_from_buffer - copy data from the buffer
624 * @to: the kernel space buffer to read to
625 * @count: the maximum number of bytes to read
626 * @ppos: the current position in the buffer
627 * @from: the buffer to read from
628 * @available: the size of the buffer
630 * The memory_read_from_buffer() function reads up to @count bytes from the
631 * buffer @from at offset @ppos into the kernel space address starting at @to.
633 * On success, the number of bytes read is returned and the offset @ppos is
634 * advanced by this number, or negative value is returned on error.
636 ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
637 const void *from, size_t available)
643 if (pos >= available)
645 if (count > available - pos)
646 count = available - pos;
647 memcpy(to, from + pos, count);
654 * Transaction based IO.
655 * The file expects a single write which triggers the transaction, and then
656 * possibly a read which collects the result - which is stored in a
660 void simple_transaction_set(struct file *file, size_t n)
662 struct simple_transaction_argresp *ar = file->private_data;
664 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
667 * The barrier ensures that ar->size will really remain zero until
668 * ar->data is ready for reading.
674 char *simple_transaction_get(struct file *file, const char __user *buf, size_t size)
676 struct simple_transaction_argresp *ar;
677 static DEFINE_SPINLOCK(simple_transaction_lock);
679 if (size > SIMPLE_TRANSACTION_LIMIT - 1)
680 return ERR_PTR(-EFBIG);
682 ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL);
684 return ERR_PTR(-ENOMEM);
686 spin_lock(&simple_transaction_lock);
688 /* only one write allowed per open */
689 if (file->private_data) {
690 spin_unlock(&simple_transaction_lock);
691 free_page((unsigned long)ar);
692 return ERR_PTR(-EBUSY);
695 file->private_data = ar;
697 spin_unlock(&simple_transaction_lock);
699 if (copy_from_user(ar->data, buf, size))
700 return ERR_PTR(-EFAULT);
705 ssize_t simple_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
707 struct simple_transaction_argresp *ar = file->private_data;
711 return simple_read_from_buffer(buf, size, pos, ar->data, ar->size);
714 int simple_transaction_release(struct inode *inode, struct file *file)
716 free_page((unsigned long)file->private_data);
720 /* Simple attribute files */
723 int (*get)(void *, u64 *);
724 int (*set)(void *, u64);
725 char get_buf[24]; /* enough to store a u64 and "\n\0" */
728 const char *fmt; /* format for read operation */
729 struct mutex mutex; /* protects access to these buffers */
732 /* simple_attr_open is called by an actual attribute open file operation
733 * to set the attribute specific access operations. */
734 int simple_attr_open(struct inode *inode, struct file *file,
735 int (*get)(void *, u64 *), int (*set)(void *, u64),
738 struct simple_attr *attr;
740 attr = kmalloc(sizeof(*attr), GFP_KERNEL);
746 attr->data = inode->i_private;
748 mutex_init(&attr->mutex);
750 file->private_data = attr;
752 return nonseekable_open(inode, file);
755 int simple_attr_release(struct inode *inode, struct file *file)
757 kfree(file->private_data);
761 /* read from the buffer that is filled with the get function */
762 ssize_t simple_attr_read(struct file *file, char __user *buf,
763 size_t len, loff_t *ppos)
765 struct simple_attr *attr;
769 attr = file->private_data;
774 ret = mutex_lock_interruptible(&attr->mutex);
778 if (*ppos) { /* continued read */
779 size = strlen(attr->get_buf);
780 } else { /* first read */
782 ret = attr->get(attr->data, &val);
786 size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
787 attr->fmt, (unsigned long long)val);
790 ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
792 mutex_unlock(&attr->mutex);
796 /* interpret the buffer as a number to call the set function with */
797 ssize_t simple_attr_write(struct file *file, const char __user *buf,
798 size_t len, loff_t *ppos)
800 struct simple_attr *attr;
805 attr = file->private_data;
809 ret = mutex_lock_interruptible(&attr->mutex);
814 size = min(sizeof(attr->set_buf) - 1, len);
815 if (copy_from_user(attr->set_buf, buf, size))
818 attr->set_buf[size] = '\0';
819 val = simple_strtol(attr->set_buf, NULL, 0);
820 ret = attr->set(attr->data, val);
822 ret = len; /* on success, claim we got the whole input */
824 mutex_unlock(&attr->mutex);
829 * generic_fh_to_dentry - generic helper for the fh_to_dentry export operation
830 * @sb: filesystem to do the file handle conversion on
831 * @fid: file handle to convert
832 * @fh_len: length of the file handle in bytes
833 * @fh_type: type of file handle
834 * @get_inode: filesystem callback to retrieve inode
836 * This function decodes @fid as long as it has one of the well-known
837 * Linux filehandle types and calls @get_inode on it to retrieve the
838 * inode for the object specified in the file handle.
840 struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid,
841 int fh_len, int fh_type, struct inode *(*get_inode)
842 (struct super_block *sb, u64 ino, u32 gen))
844 struct inode *inode = NULL;
850 case FILEID_INO32_GEN:
851 case FILEID_INO32_GEN_PARENT:
852 inode = get_inode(sb, fid->i32.ino, fid->i32.gen);
856 return d_obtain_alias(inode);
858 EXPORT_SYMBOL_GPL(generic_fh_to_dentry);
861 * generic_fh_to_dentry - generic helper for the fh_to_parent export operation
862 * @sb: filesystem to do the file handle conversion on
863 * @fid: file handle to convert
864 * @fh_len: length of the file handle in bytes
865 * @fh_type: type of file handle
866 * @get_inode: filesystem callback to retrieve inode
868 * This function decodes @fid as long as it has one of the well-known
869 * Linux filehandle types and calls @get_inode on it to retrieve the
870 * inode for the _parent_ object specified in the file handle if it
871 * is specified in the file handle, or NULL otherwise.
873 struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid,
874 int fh_len, int fh_type, struct inode *(*get_inode)
875 (struct super_block *sb, u64 ino, u32 gen))
877 struct inode *inode = NULL;
883 case FILEID_INO32_GEN_PARENT:
884 inode = get_inode(sb, fid->i32.parent_ino,
885 (fh_len > 3 ? fid->i32.parent_gen : 0));
889 return d_obtain_alias(inode);
891 EXPORT_SYMBOL_GPL(generic_fh_to_parent);
894 * generic_file_fsync - generic fsync implementation for simple filesystems
895 * @file: file to synchronize
896 * @datasync: only synchronize essential metadata if true
898 * This is a generic implementation of the fsync method for simple
899 * filesystems which track all non-inode metadata in the buffers list
900 * hanging off the address_space structure.
902 int generic_file_fsync(struct file *file, int datasync)
904 struct inode *inode = file->f_mapping->host;
908 ret = sync_mapping_buffers(inode->i_mapping);
909 if (!(inode->i_state & I_DIRTY))
911 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
914 err = sync_inode_metadata(inode, 1);
919 EXPORT_SYMBOL(generic_file_fsync);
922 * generic_check_addressable - Check addressability of file system
923 * @blocksize_bits: log of file system block size
924 * @num_blocks: number of blocks in file system
926 * Determine whether a file system with @num_blocks blocks (and a
927 * block size of 2**@blocksize_bits) is addressable by the sector_t
928 * and page cache of the system. Return 0 if so and -EFBIG otherwise.
930 int generic_check_addressable(unsigned blocksize_bits, u64 num_blocks)
932 u64 last_fs_block = num_blocks - 1;
934 last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits);
936 if (unlikely(num_blocks == 0))
939 if ((blocksize_bits < 9) || (blocksize_bits > PAGE_CACHE_SHIFT))
942 if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) ||
943 (last_fs_page > (pgoff_t)(~0ULL))) {
948 EXPORT_SYMBOL(generic_check_addressable);
951 * No-op implementation of ->fsync for in-memory filesystems.
953 int noop_fsync(struct file *file, int datasync)
958 EXPORT_SYMBOL(dcache_dir_close);
959 EXPORT_SYMBOL(dcache_dir_lseek);
960 EXPORT_SYMBOL(dcache_dir_open);
961 EXPORT_SYMBOL(dcache_readdir);
962 EXPORT_SYMBOL(generic_read_dir);
963 EXPORT_SYMBOL(mount_pseudo);
964 EXPORT_SYMBOL(simple_write_begin);
965 EXPORT_SYMBOL(simple_write_end);
966 EXPORT_SYMBOL(simple_dir_inode_operations);
967 EXPORT_SYMBOL(simple_dir_operations);
968 EXPORT_SYMBOL(simple_empty);
969 EXPORT_SYMBOL(simple_fill_super);
970 EXPORT_SYMBOL(simple_getattr);
971 EXPORT_SYMBOL(simple_link);
972 EXPORT_SYMBOL(simple_lookup);
973 EXPORT_SYMBOL(simple_pin_fs);
974 EXPORT_SYMBOL(simple_readpage);
975 EXPORT_SYMBOL(simple_release_fs);
976 EXPORT_SYMBOL(simple_rename);
977 EXPORT_SYMBOL(simple_rmdir);
978 EXPORT_SYMBOL(simple_statfs);
979 EXPORT_SYMBOL(noop_fsync);
980 EXPORT_SYMBOL(simple_unlink);
981 EXPORT_SYMBOL(simple_read_from_buffer);
982 EXPORT_SYMBOL(simple_write_to_buffer);
983 EXPORT_SYMBOL(memory_read_from_buffer);
984 EXPORT_SYMBOL(simple_transaction_set);
985 EXPORT_SYMBOL(simple_transaction_get);
986 EXPORT_SYMBOL(simple_transaction_read);
987 EXPORT_SYMBOL(simple_transaction_release);
988 EXPORT_SYMBOL_GPL(simple_attr_open);
989 EXPORT_SYMBOL_GPL(simple_attr_release);
990 EXPORT_SYMBOL_GPL(simple_attr_read);
991 EXPORT_SYMBOL_GPL(simple_attr_write);