| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001 Miklos Szeredi (mszeredi@inf.bme.hu) |
| |
| This program can be distributed under the terms of the GNU GPL. |
| See the file COPYING. |
| */ |
| |
| #include "fuse_i.h" |
| |
| #include <linux/pagemap.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/file.h> |
| |
| #define FUSE_SUPER_MAGIC 0x65735546 |
| |
| static void fuse_read_inode(struct inode *inode) |
| { |
| /* No op */ |
| } |
| |
| static void fuse_clear_inode(struct inode *inode) |
| { |
| struct fuse_conn *fc = INO_FC(inode); |
| struct fuse_in *in = NULL; |
| struct fuse_forget_in *inarg = NULL; |
| |
| if(fc == NULL) |
| return; |
| |
| in = kmalloc(sizeof(struct fuse_in), GFP_NOFS); |
| if(!in) |
| return; |
| memset(in, 0, sizeof(struct fuse_in)); |
| |
| inarg = kmalloc(sizeof(struct fuse_forget_in), GFP_NOFS); |
| if(!inarg) |
| goto out_free; |
| |
| memset(inarg, 0, sizeof(struct fuse_forget_in)); |
| inarg->version = inode->i_version; |
| |
| in->h.opcode = FUSE_FORGET; |
| in->h.ino = inode->i_ino; |
| in->numargs = 1; |
| in->args[0].size = sizeof(struct fuse_forget_in); |
| in->args[0].value = inarg; |
| |
| if(!request_send_noreply(fc, in)) |
| return; |
| |
| out_free: |
| kfree(inarg); |
| kfree(in); |
| } |
| |
| static void fuse_put_super(struct super_block *sb) |
| { |
| struct fuse_conn *fc = sb->u.generic_sbp; |
| |
| spin_lock(&fuse_lock); |
| fc->sb = NULL; |
| fc->uid = 0; |
| fc->flags = 0; |
| fuse_release_conn(fc); |
| sb->u.generic_sbp = NULL; |
| /* Flush all readers on this fs */ |
| wake_up_all(&fc->waitq); |
| spin_unlock(&fuse_lock); |
| } |
| |
| static void convert_fuse_statfs(struct statfs *stbuf, struct fuse_statfs *attr) |
| { |
| stbuf->f_type = FUSE_SUPER_MAGIC; |
| stbuf->f_bsize = attr->block_size; |
| stbuf->f_blocks = attr->blocks; |
| stbuf->f_bfree = stbuf->f_bavail = attr->blocks_free; |
| stbuf->f_files = attr->files; |
| stbuf->f_ffree = attr->files_free; |
| /* Is this field necessary? Most filesystems ignore it... |
| stbuf->f_fsid.val[0] = (FUSE_SUPER_MAGIC>>16)&0xffff; |
| stbuf->f_fsid.val[1] = FUSE_SUPER_MAGIC &0xffff; */ |
| stbuf->f_namelen = attr->namelen; |
| } |
| |
| static int fuse_statfs(struct super_block *sb, struct statfs *st) |
| { |
| struct fuse_conn *fc = sb->u.generic_sbp; |
| struct fuse_in in = FUSE_IN_INIT; |
| struct fuse_out out = FUSE_OUT_INIT; |
| struct fuse_statfs_out outarg; |
| |
| in.numargs = 0; |
| in.h.opcode = FUSE_STATFS; |
| out.numargs = 1; |
| out.args[0].size = sizeof(outarg); |
| out.args[0].value = &outarg; |
| request_send(fc, &in, &out); |
| if(!out.h.error) |
| convert_fuse_statfs(st,&outarg.st); |
| |
| return out.h.error; |
| } |
| |
| static struct super_operations fuse_super_operations = { |
| read_inode: fuse_read_inode, |
| clear_inode: fuse_clear_inode, |
| put_super: fuse_put_super, |
| statfs: fuse_statfs, |
| }; |
| |
| |
| static struct fuse_conn *get_conn(struct fuse_mount_data *d) |
| { |
| struct fuse_conn *fc = NULL; |
| struct file *file; |
| struct inode *ino; |
| |
| if(d == NULL) { |
| printk("fuse_read_super: Bad mount data\n"); |
| return NULL; |
| } |
| |
| if(d->version != FUSE_KERNEL_VERSION) { |
| printk("fuse_read_super: Bad version: %i\n", d->version); |
| return NULL; |
| } |
| |
| file = fget(d->fd); |
| ino = NULL; |
| if(file) |
| ino = file->f_dentry->d_inode; |
| |
| if(!ino || ino->u.generic_ip != proc_fuse_dev) { |
| printk("fuse_read_super: Bad file: %i\n", d->fd); |
| goto out; |
| } |
| |
| fc = file->private_data; |
| |
| out: |
| fput(file); |
| return fc; |
| |
| } |
| |
| static struct inode *get_root_inode(struct super_block *sb, unsigned int mode) |
| { |
| struct fuse_attr attr; |
| memset(&attr, 0, sizeof(attr)); |
| |
| attr.mode = mode; |
| return fuse_iget(sb, 1, &attr, 0); |
| } |
| |
| static struct super_block *fuse_read_super(struct super_block *sb, |
| void *data, int silent) |
| { |
| struct fuse_conn *fc; |
| struct inode *root; |
| struct fuse_mount_data *d = data; |
| |
| sb->s_blocksize = PAGE_CACHE_SIZE; |
| sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| sb->s_magic = FUSE_SUPER_MAGIC; |
| sb->s_op = &fuse_super_operations; |
| |
| root = get_root_inode(sb, d->rootmode); |
| if(root == NULL) { |
| printk("fuse_read_super: failed to get root inode\n"); |
| return NULL; |
| } |
| |
| spin_lock(&fuse_lock); |
| fc = get_conn(d); |
| if(fc == NULL) |
| goto err; |
| |
| if(fc->sb != NULL) { |
| printk("fuse_read_super: connection already mounted\n"); |
| goto err; |
| } |
| |
| sb->u.generic_sbp = fc; |
| sb->s_root = d_alloc_root(root); |
| if(!sb->s_root) |
| goto err; |
| |
| fc->sb = sb; |
| fc->flags = d->flags; |
| fc->uid = d->uid; |
| spin_unlock(&fuse_lock); |
| |
| return sb; |
| |
| err: |
| spin_unlock(&fuse_lock); |
| iput(root); |
| return NULL; |
| } |
| |
| |
| static DECLARE_FSTYPE(fuse_fs_type, "fuse", fuse_read_super, 0); |
| |
| int fuse_fs_init() |
| { |
| int res; |
| |
| res = register_filesystem(&fuse_fs_type); |
| if(res) |
| printk("fuse: failed to register filesystem\n"); |
| |
| return res; |
| } |
| |
| void fuse_fs_cleanup() |
| { |
| unregister_filesystem(&fuse_fs_type); |
| } |
| |
| /* |
| * Local Variables: |
| * indent-tabs-mode: t |
| * c-basic-offset: 8 |
| * End: |
| */ |
| |