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https://github.com/joel16/android_kernel_sony_msm8994.git
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8aa09a50b5
BKL does not protect against races if the task may sleep between checking and setting a value. So move checking of file->private_data near to setting it in fuse_fill_super(). Found by Al Viro. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
754 lines
17 KiB
C
754 lines
17 KiB
C
/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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*/
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#include "fuse_i.h"
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/parser.h>
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#include <linux/statfs.h>
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MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
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MODULE_DESCRIPTION("Filesystem in Userspace");
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MODULE_LICENSE("GPL");
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static kmem_cache_t *fuse_inode_cachep;
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static struct subsystem connections_subsys;
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struct fuse_conn_attr {
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struct attribute attr;
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ssize_t (*show)(struct fuse_conn *, char *);
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ssize_t (*store)(struct fuse_conn *, const char *, size_t);
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};
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#define FUSE_SUPER_MAGIC 0x65735546
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struct fuse_mount_data {
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int fd;
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unsigned rootmode;
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unsigned user_id;
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unsigned group_id;
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unsigned fd_present : 1;
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unsigned rootmode_present : 1;
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unsigned user_id_present : 1;
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unsigned group_id_present : 1;
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unsigned flags;
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unsigned max_read;
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};
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static struct inode *fuse_alloc_inode(struct super_block *sb)
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{
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struct inode *inode;
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struct fuse_inode *fi;
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inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
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if (!inode)
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return NULL;
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fi = get_fuse_inode(inode);
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fi->i_time = jiffies - 1;
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fi->nodeid = 0;
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fi->nlookup = 0;
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fi->forget_req = fuse_request_alloc();
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if (!fi->forget_req) {
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kmem_cache_free(fuse_inode_cachep, inode);
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return NULL;
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}
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return inode;
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}
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static void fuse_destroy_inode(struct inode *inode)
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{
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struct fuse_inode *fi = get_fuse_inode(inode);
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if (fi->forget_req)
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fuse_request_free(fi->forget_req);
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kmem_cache_free(fuse_inode_cachep, inode);
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}
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static void fuse_read_inode(struct inode *inode)
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{
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/* No op */
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}
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void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
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unsigned long nodeid, u64 nlookup)
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{
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struct fuse_forget_in *inarg = &req->misc.forget_in;
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inarg->nlookup = nlookup;
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req->in.h.opcode = FUSE_FORGET;
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req->in.h.nodeid = nodeid;
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req->in.numargs = 1;
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req->in.args[0].size = sizeof(struct fuse_forget_in);
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req->in.args[0].value = inarg;
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request_send_noreply(fc, req);
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}
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static void fuse_clear_inode(struct inode *inode)
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{
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if (inode->i_sb->s_flags & MS_ACTIVE) {
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struct fuse_conn *fc = get_fuse_conn(inode);
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struct fuse_inode *fi = get_fuse_inode(inode);
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fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
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fi->forget_req = NULL;
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}
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}
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void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
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{
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if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
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invalidate_inode_pages(inode->i_mapping);
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inode->i_ino = attr->ino;
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inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
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inode->i_nlink = attr->nlink;
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inode->i_uid = attr->uid;
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inode->i_gid = attr->gid;
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i_size_write(inode, attr->size);
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inode->i_blksize = PAGE_CACHE_SIZE;
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inode->i_blocks = attr->blocks;
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inode->i_atime.tv_sec = attr->atime;
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inode->i_atime.tv_nsec = attr->atimensec;
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inode->i_mtime.tv_sec = attr->mtime;
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inode->i_mtime.tv_nsec = attr->mtimensec;
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inode->i_ctime.tv_sec = attr->ctime;
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inode->i_ctime.tv_nsec = attr->ctimensec;
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}
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static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
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{
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inode->i_mode = attr->mode & S_IFMT;
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i_size_write(inode, attr->size);
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if (S_ISREG(inode->i_mode)) {
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fuse_init_common(inode);
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fuse_init_file_inode(inode);
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} else if (S_ISDIR(inode->i_mode))
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fuse_init_dir(inode);
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else if (S_ISLNK(inode->i_mode))
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fuse_init_symlink(inode);
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else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
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S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
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fuse_init_common(inode);
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init_special_inode(inode, inode->i_mode,
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new_decode_dev(attr->rdev));
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} else
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BUG();
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}
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static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
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{
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unsigned long nodeid = *(unsigned long *) _nodeidp;
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if (get_node_id(inode) == nodeid)
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return 1;
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else
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return 0;
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}
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static int fuse_inode_set(struct inode *inode, void *_nodeidp)
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{
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unsigned long nodeid = *(unsigned long *) _nodeidp;
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get_fuse_inode(inode)->nodeid = nodeid;
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return 0;
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}
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struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
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int generation, struct fuse_attr *attr)
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{
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struct inode *inode;
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struct fuse_inode *fi;
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struct fuse_conn *fc = get_fuse_conn_super(sb);
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int retried = 0;
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retry:
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inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
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if (!inode)
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return NULL;
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if ((inode->i_state & I_NEW)) {
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inode->i_flags |= S_NOATIME|S_NOCMTIME;
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inode->i_generation = generation;
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inode->i_data.backing_dev_info = &fc->bdi;
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fuse_init_inode(inode, attr);
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unlock_new_inode(inode);
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} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
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BUG_ON(retried);
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/* Inode has changed type, any I/O on the old should fail */
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make_bad_inode(inode);
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iput(inode);
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retried = 1;
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goto retry;
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}
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fi = get_fuse_inode(inode);
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fi->nlookup ++;
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fuse_change_attributes(inode, attr);
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return inode;
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}
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static void fuse_umount_begin(struct super_block *sb)
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{
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fuse_abort_conn(get_fuse_conn_super(sb));
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}
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static void fuse_put_super(struct super_block *sb)
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{
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struct fuse_conn *fc = get_fuse_conn_super(sb);
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down_write(&fc->sbput_sem);
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while (!list_empty(&fc->background))
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fuse_release_background(fc,
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list_entry(fc->background.next,
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struct fuse_req, bg_entry));
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spin_lock(&fc->lock);
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fc->mounted = 0;
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fc->connected = 0;
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spin_unlock(&fc->lock);
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up_write(&fc->sbput_sem);
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/* Flush all readers on this fs */
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kill_fasync(&fc->fasync, SIGIO, POLL_IN);
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wake_up_all(&fc->waitq);
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kobject_del(&fc->kobj);
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kobject_put(&fc->kobj);
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}
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static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
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{
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stbuf->f_type = FUSE_SUPER_MAGIC;
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stbuf->f_bsize = attr->bsize;
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stbuf->f_frsize = attr->frsize;
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stbuf->f_blocks = attr->blocks;
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stbuf->f_bfree = attr->bfree;
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stbuf->f_bavail = attr->bavail;
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stbuf->f_files = attr->files;
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stbuf->f_ffree = attr->ffree;
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stbuf->f_namelen = attr->namelen;
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/* fsid is left zero */
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}
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static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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struct fuse_conn *fc = get_fuse_conn_super(sb);
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struct fuse_req *req;
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struct fuse_statfs_out outarg;
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int err;
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req = fuse_get_req(fc);
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if (IS_ERR(req))
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return PTR_ERR(req);
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memset(&outarg, 0, sizeof(outarg));
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req->in.numargs = 0;
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req->in.h.opcode = FUSE_STATFS;
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req->out.numargs = 1;
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req->out.args[0].size =
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fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
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req->out.args[0].value = &outarg;
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request_send(fc, req);
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err = req->out.h.error;
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if (!err)
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convert_fuse_statfs(buf, &outarg.st);
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fuse_put_request(fc, req);
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return err;
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}
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enum {
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OPT_FD,
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OPT_ROOTMODE,
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OPT_USER_ID,
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OPT_GROUP_ID,
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OPT_DEFAULT_PERMISSIONS,
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OPT_ALLOW_OTHER,
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OPT_MAX_READ,
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OPT_ERR
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};
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static match_table_t tokens = {
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{OPT_FD, "fd=%u"},
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{OPT_ROOTMODE, "rootmode=%o"},
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{OPT_USER_ID, "user_id=%u"},
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{OPT_GROUP_ID, "group_id=%u"},
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{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
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{OPT_ALLOW_OTHER, "allow_other"},
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{OPT_MAX_READ, "max_read=%u"},
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{OPT_ERR, NULL}
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};
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static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
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{
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char *p;
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memset(d, 0, sizeof(struct fuse_mount_data));
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d->max_read = ~0;
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while ((p = strsep(&opt, ",")) != NULL) {
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int token;
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int value;
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substring_t args[MAX_OPT_ARGS];
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case OPT_FD:
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if (match_int(&args[0], &value))
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return 0;
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d->fd = value;
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d->fd_present = 1;
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break;
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case OPT_ROOTMODE:
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if (match_octal(&args[0], &value))
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return 0;
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d->rootmode = value;
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d->rootmode_present = 1;
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break;
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case OPT_USER_ID:
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if (match_int(&args[0], &value))
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return 0;
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d->user_id = value;
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d->user_id_present = 1;
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break;
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case OPT_GROUP_ID:
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if (match_int(&args[0], &value))
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return 0;
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d->group_id = value;
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d->group_id_present = 1;
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break;
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case OPT_DEFAULT_PERMISSIONS:
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d->flags |= FUSE_DEFAULT_PERMISSIONS;
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break;
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case OPT_ALLOW_OTHER:
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d->flags |= FUSE_ALLOW_OTHER;
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break;
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case OPT_MAX_READ:
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if (match_int(&args[0], &value))
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return 0;
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d->max_read = value;
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break;
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default:
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return 0;
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}
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}
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if (!d->fd_present || !d->rootmode_present ||
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!d->user_id_present || !d->group_id_present)
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return 0;
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return 1;
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}
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static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
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{
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struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
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seq_printf(m, ",user_id=%u", fc->user_id);
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seq_printf(m, ",group_id=%u", fc->group_id);
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if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
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seq_puts(m, ",default_permissions");
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if (fc->flags & FUSE_ALLOW_OTHER)
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seq_puts(m, ",allow_other");
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if (fc->max_read != ~0)
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seq_printf(m, ",max_read=%u", fc->max_read);
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return 0;
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}
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static void fuse_conn_release(struct kobject *kobj)
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{
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kfree(get_fuse_conn_kobj(kobj));
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}
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static struct fuse_conn *new_conn(void)
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{
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struct fuse_conn *fc;
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fc = kzalloc(sizeof(*fc), GFP_KERNEL);
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if (fc) {
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spin_lock_init(&fc->lock);
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init_waitqueue_head(&fc->waitq);
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init_waitqueue_head(&fc->blocked_waitq);
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INIT_LIST_HEAD(&fc->pending);
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INIT_LIST_HEAD(&fc->processing);
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INIT_LIST_HEAD(&fc->io);
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INIT_LIST_HEAD(&fc->background);
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init_rwsem(&fc->sbput_sem);
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kobj_set_kset_s(fc, connections_subsys);
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kobject_init(&fc->kobj);
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atomic_set(&fc->num_waiting, 0);
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fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
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fc->bdi.unplug_io_fn = default_unplug_io_fn;
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fc->reqctr = 0;
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fc->blocked = 1;
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}
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return fc;
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}
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static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
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{
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struct fuse_attr attr;
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memset(&attr, 0, sizeof(attr));
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attr.mode = mode;
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attr.ino = FUSE_ROOT_ID;
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return fuse_iget(sb, 1, 0, &attr);
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}
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static struct super_operations fuse_super_operations = {
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.alloc_inode = fuse_alloc_inode,
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.destroy_inode = fuse_destroy_inode,
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.read_inode = fuse_read_inode,
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.clear_inode = fuse_clear_inode,
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.put_super = fuse_put_super,
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.umount_begin = fuse_umount_begin,
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.statfs = fuse_statfs,
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.show_options = fuse_show_options,
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};
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static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
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{
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struct fuse_init_out *arg = &req->misc.init_out;
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if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
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fc->conn_error = 1;
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else {
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unsigned long ra_pages;
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if (arg->minor >= 6) {
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ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
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if (arg->flags & FUSE_ASYNC_READ)
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fc->async_read = 1;
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} else
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ra_pages = fc->max_read / PAGE_CACHE_SIZE;
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fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
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fc->minor = arg->minor;
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fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
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}
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fuse_put_request(fc, req);
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fc->blocked = 0;
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wake_up_all(&fc->blocked_waitq);
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}
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static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
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{
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struct fuse_init_in *arg = &req->misc.init_in;
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arg->major = FUSE_KERNEL_VERSION;
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arg->minor = FUSE_KERNEL_MINOR_VERSION;
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arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
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arg->flags |= FUSE_ASYNC_READ;
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req->in.h.opcode = FUSE_INIT;
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req->in.numargs = 1;
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req->in.args[0].size = sizeof(*arg);
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req->in.args[0].value = arg;
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req->out.numargs = 1;
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/* Variable length arguement used for backward compatibility
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with interface version < 7.5. Rest of init_out is zeroed
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by do_get_request(), so a short reply is not a problem */
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req->out.argvar = 1;
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req->out.args[0].size = sizeof(struct fuse_init_out);
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req->out.args[0].value = &req->misc.init_out;
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req->end = process_init_reply;
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request_send_background(fc, req);
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}
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static unsigned long long conn_id(void)
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{
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/* BKL is held for ->get_sb() */
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static unsigned long long ctr = 1;
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return ctr++;
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}
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static int fuse_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct fuse_conn *fc;
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struct inode *root;
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struct fuse_mount_data d;
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struct file *file;
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struct dentry *root_dentry;
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struct fuse_req *init_req;
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int err;
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if (!parse_fuse_opt((char *) data, &d))
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return -EINVAL;
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_magic = FUSE_SUPER_MAGIC;
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sb->s_op = &fuse_super_operations;
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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file = fget(d.fd);
|
|
if (!file)
|
|
return -EINVAL;
|
|
|
|
if (file->f_op != &fuse_dev_operations)
|
|
return -EINVAL;
|
|
|
|
fc = new_conn();
|
|
if (!fc)
|
|
return -ENOMEM;
|
|
|
|
fc->flags = d.flags;
|
|
fc->user_id = d.user_id;
|
|
fc->group_id = d.group_id;
|
|
fc->max_read = d.max_read;
|
|
|
|
/* Used by get_root_inode() */
|
|
sb->s_fs_info = fc;
|
|
|
|
err = -ENOMEM;
|
|
root = get_root_inode(sb, d.rootmode);
|
|
if (!root)
|
|
goto err;
|
|
|
|
root_dentry = d_alloc_root(root);
|
|
if (!root_dentry) {
|
|
iput(root);
|
|
goto err;
|
|
}
|
|
|
|
init_req = fuse_request_alloc();
|
|
if (!init_req)
|
|
goto err_put_root;
|
|
|
|
err = kobject_set_name(&fc->kobj, "%llu", conn_id());
|
|
if (err)
|
|
goto err_free_req;
|
|
|
|
err = kobject_add(&fc->kobj);
|
|
if (err)
|
|
goto err_free_req;
|
|
|
|
/* Setting file->private_data can't race with other mount()
|
|
instances, since BKL is held for ->get_sb() */
|
|
err = -EINVAL;
|
|
if (file->private_data)
|
|
goto err_kobject_del;
|
|
|
|
sb->s_root = root_dentry;
|
|
fc->mounted = 1;
|
|
fc->connected = 1;
|
|
kobject_get(&fc->kobj);
|
|
file->private_data = fc;
|
|
/*
|
|
* atomic_dec_and_test() in fput() provides the necessary
|
|
* memory barrier for file->private_data to be visible on all
|
|
* CPUs after this
|
|
*/
|
|
fput(file);
|
|
|
|
fuse_send_init(fc, init_req);
|
|
|
|
return 0;
|
|
|
|
err_kobject_del:
|
|
kobject_del(&fc->kobj);
|
|
err_free_req:
|
|
fuse_request_free(init_req);
|
|
err_put_root:
|
|
dput(root_dentry);
|
|
err:
|
|
fput(file);
|
|
kobject_put(&fc->kobj);
|
|
return err;
|
|
}
|
|
|
|
static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name,
|
|
void *raw_data)
|
|
{
|
|
return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
|
|
}
|
|
|
|
static struct file_system_type fuse_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "fuse",
|
|
.get_sb = fuse_get_sb,
|
|
.kill_sb = kill_anon_super,
|
|
};
|
|
|
|
static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page)
|
|
{
|
|
return sprintf(page, "%i\n", atomic_read(&fc->num_waiting));
|
|
}
|
|
|
|
static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page,
|
|
size_t count)
|
|
{
|
|
fuse_abort_conn(fc);
|
|
return count;
|
|
}
|
|
|
|
static struct fuse_conn_attr fuse_conn_waiting =
|
|
__ATTR(waiting, 0400, fuse_conn_waiting_show, NULL);
|
|
static struct fuse_conn_attr fuse_conn_abort =
|
|
__ATTR(abort, 0600, NULL, fuse_conn_abort_store);
|
|
|
|
static struct attribute *fuse_conn_attrs[] = {
|
|
&fuse_conn_waiting.attr,
|
|
&fuse_conn_abort.attr,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t fuse_conn_attr_show(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
char *page)
|
|
{
|
|
struct fuse_conn_attr *fca =
|
|
container_of(attr, struct fuse_conn_attr, attr);
|
|
|
|
if (fca->show)
|
|
return fca->show(get_fuse_conn_kobj(kobj), page);
|
|
else
|
|
return -EACCES;
|
|
}
|
|
|
|
static ssize_t fuse_conn_attr_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *page, size_t count)
|
|
{
|
|
struct fuse_conn_attr *fca =
|
|
container_of(attr, struct fuse_conn_attr, attr);
|
|
|
|
if (fca->store)
|
|
return fca->store(get_fuse_conn_kobj(kobj), page, count);
|
|
else
|
|
return -EACCES;
|
|
}
|
|
|
|
static struct sysfs_ops fuse_conn_sysfs_ops = {
|
|
.show = &fuse_conn_attr_show,
|
|
.store = &fuse_conn_attr_store,
|
|
};
|
|
|
|
static struct kobj_type ktype_fuse_conn = {
|
|
.release = fuse_conn_release,
|
|
.sysfs_ops = &fuse_conn_sysfs_ops,
|
|
.default_attrs = fuse_conn_attrs,
|
|
};
|
|
|
|
static decl_subsys(fuse, NULL, NULL);
|
|
static decl_subsys(connections, &ktype_fuse_conn, NULL);
|
|
|
|
static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
|
|
unsigned long flags)
|
|
{
|
|
struct inode * inode = foo;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR)
|
|
inode_init_once(inode);
|
|
}
|
|
|
|
static int __init fuse_fs_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_filesystem(&fuse_fs_type);
|
|
if (err)
|
|
printk("fuse: failed to register filesystem\n");
|
|
else {
|
|
fuse_inode_cachep = kmem_cache_create("fuse_inode",
|
|
sizeof(struct fuse_inode),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
fuse_inode_init_once, NULL);
|
|
if (!fuse_inode_cachep) {
|
|
unregister_filesystem(&fuse_fs_type);
|
|
err = -ENOMEM;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void fuse_fs_cleanup(void)
|
|
{
|
|
unregister_filesystem(&fuse_fs_type);
|
|
kmem_cache_destroy(fuse_inode_cachep);
|
|
}
|
|
|
|
static int fuse_sysfs_init(void)
|
|
{
|
|
int err;
|
|
|
|
kset_set_kset_s(&fuse_subsys, fs_subsys);
|
|
err = subsystem_register(&fuse_subsys);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
kset_set_kset_s(&connections_subsys, fuse_subsys);
|
|
err = subsystem_register(&connections_subsys);
|
|
if (err)
|
|
goto out_fuse_unregister;
|
|
|
|
return 0;
|
|
|
|
out_fuse_unregister:
|
|
subsystem_unregister(&fuse_subsys);
|
|
out_err:
|
|
return err;
|
|
}
|
|
|
|
static void fuse_sysfs_cleanup(void)
|
|
{
|
|
subsystem_unregister(&connections_subsys);
|
|
subsystem_unregister(&fuse_subsys);
|
|
}
|
|
|
|
static int __init fuse_init(void)
|
|
{
|
|
int res;
|
|
|
|
printk("fuse init (API version %i.%i)\n",
|
|
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
|
|
|
|
res = fuse_fs_init();
|
|
if (res)
|
|
goto err;
|
|
|
|
res = fuse_dev_init();
|
|
if (res)
|
|
goto err_fs_cleanup;
|
|
|
|
res = fuse_sysfs_init();
|
|
if (res)
|
|
goto err_dev_cleanup;
|
|
|
|
return 0;
|
|
|
|
err_dev_cleanup:
|
|
fuse_dev_cleanup();
|
|
err_fs_cleanup:
|
|
fuse_fs_cleanup();
|
|
err:
|
|
return res;
|
|
}
|
|
|
|
static void __exit fuse_exit(void)
|
|
{
|
|
printk(KERN_DEBUG "fuse exit\n");
|
|
|
|
fuse_sysfs_cleanup();
|
|
fuse_fs_cleanup();
|
|
fuse_dev_cleanup();
|
|
}
|
|
|
|
module_init(fuse_init);
|
|
module_exit(fuse_exit);
|