/fs/libfs.c
C | 852 lines | 702 code | 136 blank | 14 comment | 99 complexity | c4838c6d67a2509c8b8b45fec41f5a1a MD5 | raw file
Possible License(s): GPL-2.0
- #include <linux/export.h>
- #include <linux/pagemap.h>
- #include <linux/slab.h>
- #include <linux/mount.h>
- #include <linux/vfs.h>
- #include <linux/quotaops.h>
- #include <linux/mutex.h>
- #include <linux/exportfs.h>
- #include <linux/writeback.h>
- #include <linux/buffer_head.h>
- #include <asm/uaccess.h>
- #include "internal.h"
- static inline int simple_positive(struct dentry *dentry)
- {
- return dentry->d_inode && !d_unhashed(dentry);
- }
- int simple_getattr(struct vfsmount *mnt, struct dentry *dentry,
- struct kstat *stat)
- {
- struct inode *inode = dentry->d_inode;
- generic_fillattr(inode, stat);
- stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9);
- return 0;
- }
- int simple_statfs(struct dentry *dentry, struct kstatfs *buf)
- {
- buf->f_type = dentry->d_sb->s_magic;
- buf->f_bsize = PAGE_CACHE_SIZE;
- buf->f_namelen = NAME_MAX;
- return 0;
- }
- static int simple_delete_dentry(const struct dentry *dentry)
- {
- return 1;
- }
- struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
- {
- static const struct dentry_operations simple_dentry_operations = {
- .d_delete = simple_delete_dentry,
- };
- if (dentry->d_name.len > NAME_MAX)
- return ERR_PTR(-ENAMETOOLONG);
- d_set_d_op(dentry, &simple_dentry_operations);
- d_add(dentry, NULL);
- return NULL;
- }
- int dcache_dir_open(struct inode *inode, struct file *file)
- {
- static struct qstr cursor_name = {.len = 1, .name = "."};
- file->private_data = d_alloc(file->f_path.dentry, &cursor_name);
- return file->private_data ? 0 : -ENOMEM;
- }
- int dcache_dir_close(struct inode *inode, struct file *file)
- {
- dput(file->private_data);
- return 0;
- }
- loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
- {
- struct dentry *dentry = file->f_path.dentry;
- mutex_lock(&dentry->d_inode->i_mutex);
- switch (origin) {
- case 1:
- offset += file->f_pos;
- case 0:
- if (offset >= 0)
- break;
- default:
- mutex_unlock(&dentry->d_inode->i_mutex);
- return -EINVAL;
- }
- if (offset != file->f_pos) {
- file->f_pos = offset;
- if (file->f_pos >= 2) {
- struct list_head *p;
- struct dentry *cursor = file->private_data;
- loff_t n = file->f_pos - 2;
- spin_lock(&dentry->d_lock);
-
- list_del(&cursor->d_u.d_child);
- p = dentry->d_subdirs.next;
- while (n && p != &dentry->d_subdirs) {
- struct dentry *next;
- next = list_entry(p, struct dentry, d_u.d_child);
- spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
- if (simple_positive(next))
- n--;
- spin_unlock(&next->d_lock);
- p = p->next;
- }
- list_add_tail(&cursor->d_u.d_child, p);
- spin_unlock(&dentry->d_lock);
- }
- }
- mutex_unlock(&dentry->d_inode->i_mutex);
- return offset;
- }
- static inline unsigned char dt_type(struct inode *inode)
- {
- return (inode->i_mode >> 12) & 15;
- }
- int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
- {
- struct dentry *dentry = filp->f_path.dentry;
- struct dentry *cursor = filp->private_data;
- struct list_head *p, *q = &cursor->d_u.d_child;
- ino_t ino;
- int i = filp->f_pos;
- switch (i) {
- case 0:
- ino = dentry->d_inode->i_ino;
- if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
- break;
- filp->f_pos++;
- i++;
-
- case 1:
- ino = parent_ino(dentry);
- if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
- break;
- filp->f_pos++;
- i++;
-
- default:
- spin_lock(&dentry->d_lock);
- if (filp->f_pos == 2)
- list_move(q, &dentry->d_subdirs);
- for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
- struct dentry *next;
- next = list_entry(p, struct dentry, d_u.d_child);
- spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
- if (!simple_positive(next)) {
- spin_unlock(&next->d_lock);
- continue;
- }
- spin_unlock(&next->d_lock);
- spin_unlock(&dentry->d_lock);
- if (filldir(dirent, next->d_name.name,
- next->d_name.len, filp->f_pos,
- next->d_inode->i_ino,
- dt_type(next->d_inode)) < 0)
- return 0;
- spin_lock(&dentry->d_lock);
- spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
-
- list_move(q, p);
- spin_unlock(&next->d_lock);
- p = q;
- filp->f_pos++;
- }
- spin_unlock(&dentry->d_lock);
- }
- return 0;
- }
- ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos)
- {
- return -EISDIR;
- }
- const struct file_operations simple_dir_operations = {
- .open = dcache_dir_open,
- .release = dcache_dir_close,
- .llseek = dcache_dir_lseek,
- .read = generic_read_dir,
- .readdir = dcache_readdir,
- .fsync = noop_fsync,
- };
- const struct inode_operations simple_dir_inode_operations = {
- .lookup = simple_lookup,
- };
- static const struct super_operations simple_super_operations = {
- .statfs = simple_statfs,
- };
- struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name,
- const struct super_operations *ops,
- const struct dentry_operations *dops, unsigned long magic)
- {
- struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
- struct dentry *dentry;
- struct inode *root;
- struct qstr d_name = {.name = name, .len = strlen(name)};
- if (IS_ERR(s))
- return ERR_CAST(s);
- s->s_flags = MS_NOUSER;
- s->s_maxbytes = MAX_LFS_FILESIZE;
- s->s_blocksize = PAGE_SIZE;
- s->s_blocksize_bits = PAGE_SHIFT;
- s->s_magic = magic;
- s->s_op = ops ? ops : &simple_super_operations;
- s->s_time_gran = 1;
- root = new_inode(s);
- if (!root)
- goto Enomem;
- root->i_ino = 1;
- root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
- root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
- dentry = __d_alloc(s, &d_name);
- if (!dentry) {
- iput(root);
- goto Enomem;
- }
- d_instantiate(dentry, root);
- s->s_root = dentry;
- s->s_d_op = dops;
- s->s_flags |= MS_ACTIVE;
- return dget(s->s_root);
- Enomem:
- deactivate_locked_super(s);
- return ERR_PTR(-ENOMEM);
- }
- int simple_open(struct inode *inode, struct file *file)
- {
- if (inode->i_private)
- file->private_data = inode->i_private;
- return 0;
- }
- int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
- {
- struct inode *inode = old_dentry->d_inode;
- inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
- inc_nlink(inode);
- ihold(inode);
- dget(dentry);
- d_instantiate(dentry, inode);
- return 0;
- }
- int simple_empty(struct dentry *dentry)
- {
- struct dentry *child;
- int ret = 0;
- spin_lock(&dentry->d_lock);
- list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) {
- spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
- if (simple_positive(child)) {
- spin_unlock(&child->d_lock);
- goto out;
- }
- spin_unlock(&child->d_lock);
- }
- ret = 1;
- out:
- spin_unlock(&dentry->d_lock);
- return ret;
- }
- int simple_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
- drop_nlink(inode);
- dput(dentry);
- return 0;
- }
- int simple_rmdir(struct inode *dir, struct dentry *dentry)
- {
- if (!simple_empty(dentry))
- return -ENOTEMPTY;
- drop_nlink(dentry->d_inode);
- simple_unlink(dir, dentry);
- drop_nlink(dir);
- return 0;
- }
- int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
- {
- struct inode *inode = old_dentry->d_inode;
- int they_are_dirs = S_ISDIR(old_dentry->d_inode->i_mode);
- if (!simple_empty(new_dentry))
- return -ENOTEMPTY;
- if (new_dentry->d_inode) {
- simple_unlink(new_dir, new_dentry);
- if (they_are_dirs) {
- drop_nlink(new_dentry->d_inode);
- drop_nlink(old_dir);
- }
- } else if (they_are_dirs) {
- drop_nlink(old_dir);
- inc_nlink(new_dir);
- }
- old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
- new_dir->i_mtime = inode->i_ctime = CURRENT_TIME;
- return 0;
- }
- int simple_setattr(struct dentry *dentry, struct iattr *iattr)
- {
- struct inode *inode = dentry->d_inode;
- int error;
- WARN_ON_ONCE(inode->i_op->truncate);
- error = inode_change_ok(inode, iattr);
- if (error)
- return error;
- if (iattr->ia_valid & ATTR_SIZE)
- truncate_setsize(inode, iattr->ia_size);
- setattr_copy(inode, iattr);
- mark_inode_dirty(inode);
- return 0;
- }
- EXPORT_SYMBOL(simple_setattr);
- int simple_readpage(struct file *file, struct page *page)
- {
- clear_highpage(page);
- flush_dcache_page(page);
- SetPageUptodate(page);
- unlock_page(page);
- return 0;
- }
- int simple_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
- {
- struct page *page;
- pgoff_t index;
- index = pos >> PAGE_CACHE_SHIFT;
- page = grab_cache_page_write_begin(mapping, index, flags);
- if (!page)
- return -ENOMEM;
- *pagep = page;
- if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
- unsigned from = pos & (PAGE_CACHE_SIZE - 1);
- zero_user_segments(page, 0, from, from + len, PAGE_CACHE_SIZE);
- }
- return 0;
- }
- int simple_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
- {
- struct inode *inode = page->mapping->host;
- loff_t last_pos = pos + copied;
-
- if (copied < len) {
- unsigned from = pos & (PAGE_CACHE_SIZE - 1);
- zero_user(page, from + copied, len - copied);
- }
- if (!PageUptodate(page))
- SetPageUptodate(page);
- if (last_pos > inode->i_size)
- i_size_write(inode, last_pos);
- set_page_dirty(page);
- unlock_page(page);
- page_cache_release(page);
- return copied;
- }
- int simple_fill_super(struct super_block *s, unsigned long magic,
- struct tree_descr *files)
- {
- struct inode *inode;
- struct dentry *root;
- struct dentry *dentry;
- int i;
- s->s_blocksize = PAGE_CACHE_SIZE;
- s->s_blocksize_bits = PAGE_CACHE_SHIFT;
- s->s_magic = magic;
- s->s_op = &simple_super_operations;
- s->s_time_gran = 1;
- inode = new_inode(s);
- if (!inode)
- return -ENOMEM;
- inode->i_ino = 1;
- inode->i_mode = S_IFDIR | 0755;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- inode->i_op = &simple_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
- set_nlink(inode, 2);
- root = d_make_root(inode);
- if (!root)
- return -ENOMEM;
- for (i = 0; !files->name || files->name[0]; i++, files++) {
- if (!files->name)
- continue;
-
- if (unlikely(i == 1))
- printk(KERN_WARNING "%s: %s passed in a files array"
- "with an index of 1!\n", __func__,
- s->s_type->name);
- dentry = d_alloc_name(root, files->name);
- if (!dentry)
- goto out;
- inode = new_inode(s);
- if (!inode) {
- dput(dentry);
- goto out;
- }
- inode->i_mode = S_IFREG | files->mode;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- inode->i_fop = files->ops;
- inode->i_ino = i;
- d_add(dentry, inode);
- }
- s->s_root = root;
- return 0;
- out:
- d_genocide(root);
- shrink_dcache_parent(root);
- dput(root);
- return -ENOMEM;
- }
- static DEFINE_SPINLOCK(pin_fs_lock);
- int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count)
- {
- struct vfsmount *mnt = NULL;
- spin_lock(&pin_fs_lock);
- if (unlikely(!*mount)) {
- spin_unlock(&pin_fs_lock);
- mnt = vfs_kern_mount(type, MS_KERNMOUNT, type->name, NULL);
- if (IS_ERR(mnt))
- return PTR_ERR(mnt);
- spin_lock(&pin_fs_lock);
- if (!*mount)
- *mount = mnt;
- }
- mntget(*mount);
- ++*count;
- spin_unlock(&pin_fs_lock);
- mntput(mnt);
- return 0;
- }
- void simple_release_fs(struct vfsmount **mount, int *count)
- {
- struct vfsmount *mnt;
- spin_lock(&pin_fs_lock);
- mnt = *mount;
- if (!--*count)
- *mount = NULL;
- spin_unlock(&pin_fs_lock);
- mntput(mnt);
- }
- ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
- const void *from, size_t available)
- {
- loff_t pos = *ppos;
- size_t ret;
- if (pos < 0)
- return -EINVAL;
- if (pos >= available || !count)
- return 0;
- if (count > available - pos)
- count = available - pos;
- ret = copy_to_user(to, from + pos, count);
- if (ret == count)
- return -EFAULT;
- count -= ret;
- *ppos = pos + count;
- return count;
- }
- /**
- * simple_write_to_buffer - copy data from user space to the buffer
- * @to: the buffer to write to
- * @available: the size of the buffer
- * @ppos: the current position in the buffer
- * @from: the user space buffer to read from
- * @count: the maximum number of bytes to read
- *
- * The simple_write_to_buffer() function reads up to @count bytes from the user
- * space address starting at @from into the buffer @to at offset @ppos.
- *
- * On success, the number of bytes written is returned and the offset @ppos is
- * advanced by this number, or negative value is returned on error.
- **/
- ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
- const void __user *from, size_t count)
- {
- loff_t pos = *ppos;
- size_t res;
- if (pos < 0)
- return -EINVAL;
- if (pos >= available || !count)
- return 0;
- if (count > available - pos)
- count = available - pos;
- res = copy_from_user(to + pos, from, count);
- if (res == count)
- return -EFAULT;
- count -= res;
- *ppos = pos + count;
- return count;
- }
- ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
- const void *from, size_t available)
- {
- loff_t pos = *ppos;
- if (pos < 0)
- return -EINVAL;
- if (pos >= available)
- return 0;
- if (count > available - pos)
- count = available - pos;
- memcpy(to, from + pos, count);
- *ppos = pos + count;
- return count;
- }
- void simple_transaction_set(struct file *file, size_t n)
- {
- struct simple_transaction_argresp *ar = file->private_data;
- BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
- smp_mb();
- ar->size = n;
- }
- char *simple_transaction_get(struct file *file, const char __user *buf, size_t size)
- {
- struct simple_transaction_argresp *ar;
- static DEFINE_SPINLOCK(simple_transaction_lock);
- if (size > SIMPLE_TRANSACTION_LIMIT - 1)
- return ERR_PTR(-EFBIG);
- ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL);
- if (!ar)
- return ERR_PTR(-ENOMEM);
- spin_lock(&simple_transaction_lock);
-
- if (file->private_data) {
- spin_unlock(&simple_transaction_lock);
- free_page((unsigned long)ar);
- return ERR_PTR(-EBUSY);
- }
- file->private_data = ar;
- spin_unlock(&simple_transaction_lock);
- if (copy_from_user(ar->data, buf, size))
- return ERR_PTR(-EFAULT);
- return ar->data;
- }
- ssize_t simple_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
- {
- struct simple_transaction_argresp *ar = file->private_data;
- if (!ar)
- return 0;
- return simple_read_from_buffer(buf, size, pos, ar->data, ar->size);
- }
- int simple_transaction_release(struct inode *inode, struct file *file)
- {
- free_page((unsigned long)file->private_data);
- return 0;
- }
- struct simple_attr {
- int (*get)(void *, u64 *);
- int (*set)(void *, u64);
- char get_buf[24];
- char set_buf[24];
- void *data;
- const char *fmt;
- struct mutex mutex;
- };
- int simple_attr_open(struct inode *inode, struct file *file,
- int (*get)(void *, u64 *), int (*set)(void *, u64),
- const char *fmt)
- {
- struct simple_attr *attr;
- attr = kmalloc(sizeof(*attr), GFP_KERNEL);
- if (!attr)
- return -ENOMEM;
- attr->get = get;
- attr->set = set;
- attr->data = inode->i_private;
- attr->fmt = fmt;
- mutex_init(&attr->mutex);
- file->private_data = attr;
- return nonseekable_open(inode, file);
- }
- int simple_attr_release(struct inode *inode, struct file *file)
- {
- kfree(file->private_data);
- return 0;
- }
- ssize_t simple_attr_read(struct file *file, char __user *buf,
- size_t len, loff_t *ppos)
- {
- struct simple_attr *attr;
- size_t size;
- ssize_t ret;
- attr = file->private_data;
- if (!attr->get)
- return -EACCES;
- ret = mutex_lock_interruptible(&attr->mutex);
- if (ret)
- return ret;
- if (*ppos) {
- size = strlen(attr->get_buf);
- } else {
- u64 val;
- ret = attr->get(attr->data, &val);
- if (ret)
- goto out;
- size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
- attr->fmt, (unsigned long long)val);
- }
- ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
- out:
- mutex_unlock(&attr->mutex);
- return ret;
- }
- ssize_t simple_attr_write(struct file *file, const char __user *buf,
- size_t len, loff_t *ppos)
- {
- struct simple_attr *attr;
- u64 val;
- size_t size;
- ssize_t ret;
- attr = file->private_data;
- if (!attr->set)
- return -EACCES;
- ret = mutex_lock_interruptible(&attr->mutex);
- if (ret)
- return ret;
- ret = -EFAULT;
- size = min(sizeof(attr->set_buf) - 1, len);
- if (copy_from_user(attr->set_buf, buf, size))
- goto out;
- attr->set_buf[size] = '\0';
- val = simple_strtoll(attr->set_buf, NULL, 0);
- ret = attr->set(attr->data, val);
- if (ret == 0)
- ret = len;
- out:
- mutex_unlock(&attr->mutex);
- return ret;
- }
- struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid,
- int fh_len, int fh_type, struct inode *(*get_inode)
- (struct super_block *sb, u64 ino, u32 gen))
- {
- struct inode *inode = NULL;
- if (fh_len < 2)
- return NULL;
- switch (fh_type) {
- case FILEID_INO32_GEN:
- case FILEID_INO32_GEN_PARENT:
- inode = get_inode(sb, fid->i32.ino, fid->i32.gen);
- break;
- }
- return d_obtain_alias(inode);
- }
- EXPORT_SYMBOL_GPL(generic_fh_to_dentry);
- struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid,
- int fh_len, int fh_type, struct inode *(*get_inode)
- (struct super_block *sb, u64 ino, u32 gen))
- {
- struct inode *inode = NULL;
- if (fh_len <= 2)
- return NULL;
- switch (fh_type) {
- case FILEID_INO32_GEN_PARENT:
- inode = get_inode(sb, fid->i32.parent_ino,
- (fh_len > 3 ? fid->i32.parent_gen : 0));
- break;
- }
- return d_obtain_alias(inode);
- }
- EXPORT_SYMBOL_GPL(generic_fh_to_parent);
- int generic_file_fsync(struct file *file, loff_t start, loff_t end,
- int datasync)
- {
- struct inode *inode = file->f_mapping->host;
- int err;
- int ret;
- err = filemap_write_and_wait_range(inode->i_mapping, start, end);
- if (err)
- return err;
- mutex_lock(&inode->i_mutex);
- ret = sync_mapping_buffers(inode->i_mapping);
- if (!(inode->i_state & I_DIRTY))
- goto out;
- if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
- goto out;
- err = sync_inode_metadata(inode, 1);
- if (ret == 0)
- ret = err;
- out:
- mutex_unlock(&inode->i_mutex);
- return ret;
- }
- EXPORT_SYMBOL(generic_file_fsync);
- int generic_check_addressable(unsigned blocksize_bits, u64 num_blocks)
- {
- u64 last_fs_block = num_blocks - 1;
- u64 last_fs_page =
- last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits);
- if (unlikely(num_blocks == 0))
- return 0;
- if ((blocksize_bits < 9) || (blocksize_bits > PAGE_CACHE_SHIFT))
- return -EINVAL;
- if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) ||
- (last_fs_page > (pgoff_t)(~0ULL))) {
- return -EFBIG;
- }
- return 0;
- }
- EXPORT_SYMBOL(generic_check_addressable);
- int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync)
- {
- return 0;
- }
- EXPORT_SYMBOL(dcache_dir_close);
- EXPORT_SYMBOL(dcache_dir_lseek);
- EXPORT_SYMBOL(dcache_dir_open);
- EXPORT_SYMBOL(dcache_readdir);
- EXPORT_SYMBOL(generic_read_dir);
- EXPORT_SYMBOL(mount_pseudo);
- EXPORT_SYMBOL(simple_write_begin);
- EXPORT_SYMBOL(simple_write_end);
- EXPORT_SYMBOL(simple_dir_inode_operations);
- EXPORT_SYMBOL(simple_dir_operations);
- EXPORT_SYMBOL(simple_empty);
- EXPORT_SYMBOL(simple_fill_super);
- EXPORT_SYMBOL(simple_getattr);
- EXPORT_SYMBOL(simple_open);
- EXPORT_SYMBOL(simple_link);
- EXPORT_SYMBOL(simple_lookup);
- EXPORT_SYMBOL(simple_pin_fs);
- EXPORT_SYMBOL(simple_readpage);
- EXPORT_SYMBOL(simple_release_fs);
- EXPORT_SYMBOL(simple_rename);
- EXPORT_SYMBOL(simple_rmdir);
- EXPORT_SYMBOL(simple_statfs);
- EXPORT_SYMBOL(noop_fsync);
- EXPORT_SYMBOL(simple_unlink);
- EXPORT_SYMBOL(simple_read_from_buffer);
- EXPORT_SYMBOL(simple_write_to_buffer);
- EXPORT_SYMBOL(memory_read_from_buffer);
- EXPORT_SYMBOL(simple_transaction_set);
- EXPORT_SYMBOL(simple_transaction_get);
- EXPORT_SYMBOL(simple_transaction_read);
- EXPORT_SYMBOL(simple_transaction_release);
- EXPORT_SYMBOL_GPL(simple_attr_open);
- EXPORT_SYMBOL_GPL(simple_attr_release);
- EXPORT_SYMBOL_GPL(simple_attr_read);
- EXPORT_SYMBOL_GPL(simple_attr_write);