![Theodore Ts'o](/assets/img/avatar_default.png)
This eliminates the i_blksize field from struct inode. Filesystems that want to provide a per-inode st_blksize can do so by providing their own getattr routine instead of using the generic_fillattr() function. Note that some filesystems were providing pretty much random (and incorrect) values for i_blksize. [bunk@stusta.de: cleanup] [akpm@osdl.org: generic_fillattr() fix] Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
650 lines
15 KiB
C
650 lines
15 KiB
C
/*
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* fs/libfs.c
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* Library for filesystems writers.
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*/
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/mount.h>
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#include <linux/vfs.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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int simple_getattr(struct vfsmount *mnt, struct dentry *dentry,
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struct kstat *stat)
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{
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struct inode *inode = dentry->d_inode;
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generic_fillattr(inode, stat);
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stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9);
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return 0;
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}
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int simple_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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buf->f_type = dentry->d_sb->s_magic;
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buf->f_bsize = PAGE_CACHE_SIZE;
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buf->f_namelen = NAME_MAX;
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return 0;
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}
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/*
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* Retaining negative dentries for an in-memory filesystem just wastes
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* memory and lookup time: arrange for them to be deleted immediately.
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*/
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static int simple_delete_dentry(struct dentry *dentry)
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{
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return 1;
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}
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/*
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* Lookup the data. This is trivial - if the dentry didn't already
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* exist, we know it is negative. Set d_op to delete negative dentries.
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*/
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struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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{
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static struct dentry_operations simple_dentry_operations = {
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.d_delete = simple_delete_dentry,
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};
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if (dentry->d_name.len > NAME_MAX)
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return ERR_PTR(-ENAMETOOLONG);
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dentry->d_op = &simple_dentry_operations;
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d_add(dentry, NULL);
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return NULL;
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}
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int simple_sync_file(struct file * file, struct dentry *dentry, int datasync)
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{
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return 0;
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}
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int dcache_dir_open(struct inode *inode, struct file *file)
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{
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static struct qstr cursor_name = {.len = 1, .name = "."};
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file->private_data = d_alloc(file->f_dentry, &cursor_name);
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return file->private_data ? 0 : -ENOMEM;
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}
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int dcache_dir_close(struct inode *inode, struct file *file)
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{
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dput(file->private_data);
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return 0;
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}
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loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
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{
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mutex_lock(&file->f_dentry->d_inode->i_mutex);
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switch (origin) {
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case 1:
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offset += file->f_pos;
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case 0:
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if (offset >= 0)
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break;
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default:
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mutex_unlock(&file->f_dentry->d_inode->i_mutex);
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return -EINVAL;
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}
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if (offset != file->f_pos) {
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file->f_pos = offset;
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if (file->f_pos >= 2) {
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struct list_head *p;
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struct dentry *cursor = file->private_data;
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loff_t n = file->f_pos - 2;
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spin_lock(&dcache_lock);
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list_del(&cursor->d_u.d_child);
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p = file->f_dentry->d_subdirs.next;
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while (n && p != &file->f_dentry->d_subdirs) {
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struct dentry *next;
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next = list_entry(p, struct dentry, d_u.d_child);
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if (!d_unhashed(next) && next->d_inode)
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n--;
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p = p->next;
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}
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list_add_tail(&cursor->d_u.d_child, p);
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spin_unlock(&dcache_lock);
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}
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}
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mutex_unlock(&file->f_dentry->d_inode->i_mutex);
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return offset;
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}
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/* Relationship between i_mode and the DT_xxx types */
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static inline unsigned char dt_type(struct inode *inode)
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{
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return (inode->i_mode >> 12) & 15;
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}
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/*
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* Directory is locked and all positive dentries in it are safe, since
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* for ramfs-type trees they can't go away without unlink() or rmdir(),
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* both impossible due to the lock on directory.
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*/
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int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
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{
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struct dentry *dentry = filp->f_dentry;
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struct dentry *cursor = filp->private_data;
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struct list_head *p, *q = &cursor->d_u.d_child;
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ino_t ino;
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int i = filp->f_pos;
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switch (i) {
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case 0:
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ino = dentry->d_inode->i_ino;
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if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
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break;
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filp->f_pos++;
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i++;
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/* fallthrough */
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case 1:
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ino = parent_ino(dentry);
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if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
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break;
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filp->f_pos++;
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i++;
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/* fallthrough */
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default:
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spin_lock(&dcache_lock);
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if (filp->f_pos == 2)
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list_move(q, &dentry->d_subdirs);
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for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
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struct dentry *next;
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next = list_entry(p, struct dentry, d_u.d_child);
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if (d_unhashed(next) || !next->d_inode)
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continue;
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spin_unlock(&dcache_lock);
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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)
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return 0;
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spin_lock(&dcache_lock);
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/* next is still alive */
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list_move(q, p);
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p = q;
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filp->f_pos++;
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}
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spin_unlock(&dcache_lock);
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}
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return 0;
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}
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ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos)
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{
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return -EISDIR;
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}
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const struct file_operations simple_dir_operations = {
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.open = dcache_dir_open,
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.release = dcache_dir_close,
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.llseek = dcache_dir_lseek,
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.read = generic_read_dir,
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.readdir = dcache_readdir,
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.fsync = simple_sync_file,
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};
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struct inode_operations simple_dir_inode_operations = {
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.lookup = simple_lookup,
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};
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/*
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* Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
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* will never be mountable)
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*/
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int get_sb_pseudo(struct file_system_type *fs_type, char *name,
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struct super_operations *ops, unsigned long magic,
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struct vfsmount *mnt)
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{
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struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
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static struct super_operations default_ops = {.statfs = simple_statfs};
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struct dentry *dentry;
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struct inode *root;
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struct qstr d_name = {.name = name, .len = strlen(name)};
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if (IS_ERR(s))
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return PTR_ERR(s);
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s->s_flags = MS_NOUSER;
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s->s_maxbytes = ~0ULL;
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s->s_blocksize = 1024;
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s->s_blocksize_bits = 10;
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s->s_magic = magic;
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s->s_op = ops ? ops : &default_ops;
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s->s_time_gran = 1;
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root = new_inode(s);
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if (!root)
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goto Enomem;
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root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
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root->i_uid = root->i_gid = 0;
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root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
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dentry = d_alloc(NULL, &d_name);
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if (!dentry) {
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iput(root);
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goto Enomem;
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}
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dentry->d_sb = s;
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dentry->d_parent = dentry;
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d_instantiate(dentry, root);
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s->s_root = dentry;
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s->s_flags |= MS_ACTIVE;
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return simple_set_mnt(mnt, s);
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Enomem:
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up_write(&s->s_umount);
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deactivate_super(s);
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return -ENOMEM;
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}
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int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = old_dentry->d_inode;
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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inode->i_nlink++;
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atomic_inc(&inode->i_count);
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dget(dentry);
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d_instantiate(dentry, inode);
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return 0;
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}
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static inline int simple_positive(struct dentry *dentry)
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{
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return dentry->d_inode && !d_unhashed(dentry);
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}
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int simple_empty(struct dentry *dentry)
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{
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struct dentry *child;
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int ret = 0;
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spin_lock(&dcache_lock);
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list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
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if (simple_positive(child))
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goto out;
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ret = 1;
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out:
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spin_unlock(&dcache_lock);
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return ret;
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}
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int simple_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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inode->i_nlink--;
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dput(dentry);
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return 0;
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}
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int simple_rmdir(struct inode *dir, struct dentry *dentry)
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{
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if (!simple_empty(dentry))
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return -ENOTEMPTY;
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dentry->d_inode->i_nlink--;
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simple_unlink(dir, dentry);
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dir->i_nlink--;
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return 0;
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}
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int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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struct inode *inode = old_dentry->d_inode;
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int they_are_dirs = S_ISDIR(old_dentry->d_inode->i_mode);
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if (!simple_empty(new_dentry))
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return -ENOTEMPTY;
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if (new_dentry->d_inode) {
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simple_unlink(new_dir, new_dentry);
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if (they_are_dirs)
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old_dir->i_nlink--;
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} else if (they_are_dirs) {
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old_dir->i_nlink--;
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new_dir->i_nlink++;
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}
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old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
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new_dir->i_mtime = inode->i_ctime = CURRENT_TIME;
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return 0;
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}
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int simple_readpage(struct file *file, struct page *page)
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{
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void *kaddr;
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if (PageUptodate(page))
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goto out;
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kaddr = kmap_atomic(page, KM_USER0);
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memset(kaddr, 0, PAGE_CACHE_SIZE);
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kunmap_atomic(kaddr, KM_USER0);
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flush_dcache_page(page);
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SetPageUptodate(page);
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out:
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unlock_page(page);
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return 0;
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}
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int simple_prepare_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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{
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if (!PageUptodate(page)) {
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if (to - from != PAGE_CACHE_SIZE) {
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void *kaddr = kmap_atomic(page, KM_USER0);
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memset(kaddr, 0, from);
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memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
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flush_dcache_page(page);
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kunmap_atomic(kaddr, KM_USER0);
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}
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SetPageUptodate(page);
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}
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return 0;
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}
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int simple_commit_write(struct file *file, struct page *page,
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unsigned offset, unsigned to)
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{
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struct inode *inode = page->mapping->host;
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loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
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/*
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* No need to use i_size_read() here, the i_size
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* cannot change under us because we hold the i_mutex.
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*/
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if (pos > inode->i_size)
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i_size_write(inode, pos);
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set_page_dirty(page);
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return 0;
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}
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int simple_fill_super(struct super_block *s, int magic, struct tree_descr *files)
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{
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static struct super_operations s_ops = {.statfs = simple_statfs};
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struct inode *inode;
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struct dentry *root;
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struct dentry *dentry;
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int i;
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s->s_blocksize = PAGE_CACHE_SIZE;
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s->s_blocksize_bits = PAGE_CACHE_SHIFT;
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s->s_magic = magic;
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s->s_op = &s_ops;
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s->s_time_gran = 1;
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inode = new_inode(s);
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if (!inode)
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return -ENOMEM;
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inode->i_mode = S_IFDIR | 0755;
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inode->i_uid = inode->i_gid = 0;
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inode->i_blocks = 0;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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inode->i_nlink = 2;
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root = d_alloc_root(inode);
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if (!root) {
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iput(inode);
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return -ENOMEM;
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}
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for (i = 0; !files->name || files->name[0]; i++, files++) {
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if (!files->name)
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continue;
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dentry = d_alloc_name(root, files->name);
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if (!dentry)
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goto out;
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inode = new_inode(s);
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if (!inode)
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goto out;
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inode->i_mode = S_IFREG | files->mode;
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inode->i_uid = inode->i_gid = 0;
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inode->i_blocks = 0;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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inode->i_fop = files->ops;
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inode->i_ino = i;
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d_add(dentry, inode);
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}
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s->s_root = root;
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return 0;
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out:
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d_genocide(root);
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dput(root);
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return -ENOMEM;
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}
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static DEFINE_SPINLOCK(pin_fs_lock);
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int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count)
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{
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struct vfsmount *mnt = NULL;
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spin_lock(&pin_fs_lock);
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if (unlikely(!*mount)) {
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spin_unlock(&pin_fs_lock);
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mnt = vfs_kern_mount(type, 0, type->name, NULL);
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if (IS_ERR(mnt))
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return PTR_ERR(mnt);
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spin_lock(&pin_fs_lock);
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if (!*mount)
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*mount = mnt;
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}
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mntget(*mount);
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++*count;
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spin_unlock(&pin_fs_lock);
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mntput(mnt);
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return 0;
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}
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void simple_release_fs(struct vfsmount **mount, int *count)
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{
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struct vfsmount *mnt;
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spin_lock(&pin_fs_lock);
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mnt = *mount;
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if (!--*count)
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*mount = NULL;
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spin_unlock(&pin_fs_lock);
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mntput(mnt);
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}
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ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
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const void *from, size_t available)
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{
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loff_t pos = *ppos;
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if (pos < 0)
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return -EINVAL;
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if (pos >= available)
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return 0;
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if (count > available - pos)
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count = available - pos;
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if (copy_to_user(to, from + pos, count))
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return -EFAULT;
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*ppos = pos + count;
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return count;
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}
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/*
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* Transaction based IO.
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* The file expects a single write which triggers the transaction, and then
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* possibly a read which collects the result - which is stored in a
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* file-local buffer.
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*/
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char *simple_transaction_get(struct file *file, const char __user *buf, size_t size)
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{
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struct simple_transaction_argresp *ar;
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static DEFINE_SPINLOCK(simple_transaction_lock);
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if (size > SIMPLE_TRANSACTION_LIMIT - 1)
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return ERR_PTR(-EFBIG);
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ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL);
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if (!ar)
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return ERR_PTR(-ENOMEM);
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spin_lock(&simple_transaction_lock);
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/* only one write allowed per open */
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if (file->private_data) {
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spin_unlock(&simple_transaction_lock);
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free_page((unsigned long)ar);
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return ERR_PTR(-EBUSY);
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}
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file->private_data = ar;
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spin_unlock(&simple_transaction_lock);
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if (copy_from_user(ar->data, buf, size))
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return ERR_PTR(-EFAULT);
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return ar->data;
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}
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|
|
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;
|
|
}
|
|
|
|
/* Simple attribute files */
|
|
|
|
struct simple_attr {
|
|
u64 (*get)(void *);
|
|
void (*set)(void *, u64);
|
|
char get_buf[24]; /* enough to store a u64 and "\n\0" */
|
|
char set_buf[24];
|
|
void *data;
|
|
const char *fmt; /* format for read operation */
|
|
struct mutex mutex; /* protects access to these buffers */
|
|
};
|
|
|
|
/* simple_attr_open is called by an actual attribute open file operation
|
|
* to set the attribute specific access operations. */
|
|
int simple_attr_open(struct inode *inode, struct file *file,
|
|
u64 (*get)(void *), void (*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_close(struct inode *inode, struct file *file)
|
|
{
|
|
kfree(file->private_data);
|
|
return 0;
|
|
}
|
|
|
|
/* read from the buffer that is filled with the get function */
|
|
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;
|
|
|
|
mutex_lock(&attr->mutex);
|
|
if (*ppos) /* continued read */
|
|
size = strlen(attr->get_buf);
|
|
else /* first read */
|
|
size = scnprintf(attr->get_buf, sizeof(attr->get_buf),
|
|
attr->fmt,
|
|
(unsigned long long)attr->get(attr->data));
|
|
|
|
ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
|
|
mutex_unlock(&attr->mutex);
|
|
return ret;
|
|
}
|
|
|
|
/* interpret the buffer as a number to call the set function with */
|
|
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;
|
|
|
|
mutex_lock(&attr->mutex);
|
|
ret = -EFAULT;
|
|
size = min(sizeof(attr->set_buf) - 1, len);
|
|
if (copy_from_user(attr->set_buf, buf, size))
|
|
goto out;
|
|
|
|
ret = len; /* claim we got the whole input */
|
|
attr->set_buf[size] = '\0';
|
|
val = simple_strtol(attr->set_buf, NULL, 0);
|
|
attr->set(attr->data, val);
|
|
out:
|
|
mutex_unlock(&attr->mutex);
|
|
return ret;
|
|
}
|
|
|
|
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(get_sb_pseudo);
|
|
EXPORT_SYMBOL(simple_commit_write);
|
|
EXPORT_SYMBOL(simple_dir_inode_operations);
|
|
EXPORT_SYMBOL(simple_dir_operations);
|
|
EXPORT_SYMBOL(simple_empty);
|
|
EXPORT_SYMBOL(d_alloc_name);
|
|
EXPORT_SYMBOL(simple_fill_super);
|
|
EXPORT_SYMBOL(simple_getattr);
|
|
EXPORT_SYMBOL(simple_link);
|
|
EXPORT_SYMBOL(simple_lookup);
|
|
EXPORT_SYMBOL(simple_pin_fs);
|
|
EXPORT_SYMBOL(simple_prepare_write);
|
|
EXPORT_SYMBOL(simple_readpage);
|
|
EXPORT_SYMBOL(simple_release_fs);
|
|
EXPORT_SYMBOL(simple_rename);
|
|
EXPORT_SYMBOL(simple_rmdir);
|
|
EXPORT_SYMBOL(simple_statfs);
|
|
EXPORT_SYMBOL(simple_sync_file);
|
|
EXPORT_SYMBOL(simple_unlink);
|
|
EXPORT_SYMBOL(simple_read_from_buffer);
|
|
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_close);
|
|
EXPORT_SYMBOL_GPL(simple_attr_read);
|
|
EXPORT_SYMBOL_GPL(simple_attr_write);
|