diff options
Diffstat (limited to 'kernel/control.c')
| -rw-r--r-- | kernel/control.c | 254 |
1 files changed, 0 insertions, 254 deletions
diff --git a/kernel/control.c b/kernel/control.c deleted file mode 100644 index 5ffe6ba..0000000 --- a/kernel/control.c +++ /dev/null @@ -1,254 +0,0 @@ -/* - FUSE: Filesystem in Userspace - Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> - - This program can be distributed under the terms of the GNU GPL. - See the file COPYING. -*/ - -#include "fuse_i.h" - -#include <linux/init.h> -#include <linux/module.h> - -#define FUSE_CTL_SUPER_MAGIC 0x65735543 -#ifndef HAVE_I_PRIVATE -#define i_private u.generic_ip -#endif - -/* - * This is non-NULL when the single instance of the control filesystem - * exists. Protected by fuse_mutex - */ -static struct super_block *fuse_control_sb; - -static struct fuse_conn *fuse_ctl_file_conn_get(struct file *file) -{ - struct fuse_conn *fc; - mutex_lock(&fuse_mutex); - fc = file->f_dentry->d_inode->i_private; - if (fc) - fc = fuse_conn_get(fc); - mutex_unlock(&fuse_mutex); - return fc; -} - -static ssize_t fuse_conn_abort_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct fuse_conn *fc = fuse_ctl_file_conn_get(file); - if (fc) { - fuse_abort_conn(fc); - fuse_conn_put(fc); - } - return count; -} - -static ssize_t fuse_conn_waiting_read(struct file *file, char __user *buf, - size_t len, loff_t *ppos) -{ - char tmp[32]; - size_t size; - - if (!*ppos) { - struct fuse_conn *fc = fuse_ctl_file_conn_get(file); - if (!fc) - return 0; - - file->private_data=(void *)(long)atomic_read(&fc->num_waiting); - fuse_conn_put(fc); - } - size = sprintf(tmp, "%ld\n", (long)file->private_data); - return simple_read_from_buffer(buf, len, ppos, tmp, size); -} - -static struct file_operations fuse_ctl_abort_ops = { - .open = nonseekable_open, - .write = fuse_conn_abort_write, -}; - -static struct file_operations fuse_ctl_waiting_ops = { - .open = nonseekable_open, - .read = fuse_conn_waiting_read, -}; - -#ifndef KERNEL_2_6_10_PLUS -struct dentry *d_alloc_name(struct dentry *parent, const char *name) -{ - struct qstr q; - - q.name = (const unsigned char *) name; - q.len = strlen(name); - q.hash = full_name_hash(q.name, q.len); - return d_alloc(parent, &q); -} -#endif -static struct dentry *fuse_ctl_add_dentry(struct dentry *parent, - struct fuse_conn *fc, - const char *name, - int mode, int nlink, -#ifdef KERNEL_2_6_21_PLUS - const struct inode_operations *iop, -#else - struct inode_operations *iop, -#endif -#ifdef KERNEL_2_6_17_PLUS - const struct file_operations *fop -#else - struct file_operations *fop -#endif -) -{ - struct dentry *dentry; - struct inode *inode; - - BUG_ON(fc->ctl_ndents >= FUSE_CTL_NUM_DENTRIES); - dentry = d_alloc_name(parent, name); - if (!dentry) - return NULL; - - fc->ctl_dentry[fc->ctl_ndents++] = dentry; - inode = new_inode(fuse_control_sb); - if (!inode) - return NULL; - - inode->i_mode = mode; - inode->i_uid = fc->user_id; - inode->i_gid = fc->group_id; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; - /* setting ->i_op to NULL is not allowed */ - if (iop) - inode->i_op = iop; - inode->i_fop = fop; - inode->i_nlink = nlink; - inode->i_private = fc; - d_add(dentry, inode); - return dentry; -} - -/* - * Add a connection to the control filesystem (if it exists). Caller - * must hold fuse_mutex - */ -int fuse_ctl_add_conn(struct fuse_conn *fc) -{ - struct dentry *parent; - char name[32]; - - if (!fuse_control_sb) - return 0; - - parent = fuse_control_sb->s_root; - inc_nlink(parent->d_inode); - sprintf(name, "%llu", (unsigned long long) fc->id); - parent = fuse_ctl_add_dentry(parent, fc, name, S_IFDIR | 0500, 2, - &simple_dir_inode_operations, - &simple_dir_operations); - if (!parent) - goto err; - - if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, 1, - NULL, &fuse_ctl_waiting_ops) || - !fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, 1, - NULL, &fuse_ctl_abort_ops)) - goto err; - - return 0; - - err: - fuse_ctl_remove_conn(fc); - return -ENOMEM; -} - -/* - * Remove a connection from the control filesystem (if it exists). - * Caller must hold fuse_mutex - */ -void fuse_ctl_remove_conn(struct fuse_conn *fc) -{ - int i; - - if (!fuse_control_sb) - return; - - for (i = fc->ctl_ndents - 1; i >= 0; i--) { - struct dentry *dentry = fc->ctl_dentry[i]; - dentry->d_inode->i_private = NULL; - d_drop(dentry); - dput(dentry); - } - fuse_control_sb->s_root->d_inode->i_nlink--; -} - -static int fuse_ctl_fill_super(struct super_block *sb, void *data, int silent) -{ - struct tree_descr empty_descr = {""}; - struct fuse_conn *fc; - int err; - - err = simple_fill_super(sb, FUSE_CTL_SUPER_MAGIC, &empty_descr); - if (err) - return err; - - mutex_lock(&fuse_mutex); - BUG_ON(fuse_control_sb); - fuse_control_sb = sb; - list_for_each_entry(fc, &fuse_conn_list, entry) { - err = fuse_ctl_add_conn(fc); - if (err) { - fuse_control_sb = NULL; - mutex_unlock(&fuse_mutex); - return err; - } - } - mutex_unlock(&fuse_mutex); - - return 0; -} - -#ifdef KERNEL_2_6_18_PLUS -static int fuse_ctl_get_sb(struct file_system_type *fs_type, int flags, - const char *dev_name, void *raw_data, - struct vfsmount *mnt) -{ - return get_sb_single(fs_type, flags, raw_data, - fuse_ctl_fill_super, mnt); -} -#else -static struct super_block *fuse_ctl_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, - void *raw_data) -{ - return get_sb_single(fs_type, flags, raw_data, fuse_ctl_fill_super); -} -#endif - -static void fuse_ctl_kill_sb(struct super_block *sb) -{ - struct fuse_conn *fc; - - mutex_lock(&fuse_mutex); - fuse_control_sb = NULL; - list_for_each_entry(fc, &fuse_conn_list, entry) - fc->ctl_ndents = 0; - mutex_unlock(&fuse_mutex); - - kill_litter_super(sb); -} - -static struct file_system_type fuse_ctl_fs_type = { - .owner = THIS_MODULE, - .name = "fusectl", - .get_sb = fuse_ctl_get_sb, - .kill_sb = fuse_ctl_kill_sb, -}; - -int __init fuse_ctl_init(void) -{ - return register_filesystem(&fuse_ctl_fs_type); -} - -void fuse_ctl_cleanup(void) -{ - unregister_filesystem(&fuse_ctl_fs_type); -} |