| /* |
| 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 <linux/fuse.h> |
| |
| #include <linux/config.h> |
| #ifdef CONFIG_MODVERSIONS |
| #define MODVERSIONS |
| #include <linux/modversions.h> |
| #endif |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| |
| #include <linux/fs.h> |
| #include <linux/list.h> |
| #include <linux/spinlock.h> |
| |
| |
| /** |
| * A Fuse connection. |
| * |
| * This structure is created, when the client device is opened, and is |
| * destroyed, when the client device is closed _and_ the filesystem is |
| * unmounted. |
| */ |
| struct fuse_conn { |
| /** The superblock of the mounted filesystem */ |
| struct super_block *sb; |
| |
| /** The opened client device */ |
| struct file *file; |
| |
| /** The user id for this mount */ |
| uid_t uid; |
| |
| /** The fuse mount flags for this mount */ |
| unsigned int flags; |
| |
| /** Readers of the connection are waiting on this */ |
| wait_queue_head_t waitq; |
| |
| /** The list of pending requests */ |
| struct list_head pending; |
| |
| /** The list of requests being processed */ |
| struct list_head processing; |
| |
| /** Controls the maximum number of outstanding requests */ |
| struct semaphore outstanding; |
| |
| /** The next unique request id */ |
| int reqctr; |
| |
| /* Flag indicating whether the release call is supported */ |
| int has_release; |
| }; |
| |
| /** One input argument of a request */ |
| struct fuse_in_arg { |
| unsigned int size; |
| const void *value; |
| }; |
| |
| /** The request input */ |
| struct fuse_in { |
| struct fuse_in_header h; |
| unsigned int numargs; |
| struct fuse_in_arg args[3]; |
| }; |
| |
| /** One output argument of a request */ |
| struct fuse_out_arg { |
| unsigned int size; |
| void *value; |
| }; |
| |
| /** The request output */ |
| struct fuse_out { |
| struct fuse_out_header h; |
| unsigned int argvar; |
| unsigned int numargs; |
| struct fuse_out_arg args[3]; |
| }; |
| |
| #define FUSE_IN_INIT { {0, 0, 0, current->fsuid, current->fsgid}, 0} |
| #define FUSE_OUT_INIT { {0, 0}, 0, 0} |
| |
| /** |
| * A request to the client |
| */ |
| struct fuse_req { |
| /** The request list */ |
| struct list_head list; |
| |
| /** True if the request is synchronous */ |
| unsigned int issync:1; |
| |
| /** The request is locked */ |
| unsigned int locked:1; |
| |
| /** The request has been interrupted while it was locked */ |
| unsigned int interrupted:1; |
| |
| /* The request has been sent to the client */ |
| unsigned int sent:1; |
| |
| /* The request is finished */ |
| unsigned int finished:1; |
| |
| /** The request input */ |
| struct fuse_in *in; |
| |
| /** The request output */ |
| struct fuse_out *out; |
| |
| /** Used to wake up the task waiting for completion of request*/ |
| wait_queue_head_t waitq; |
| }; |
| |
| |
| #define INO_FC(inode) ((struct fuse_conn *) (inode)->i_sb->u.generic_sbp) |
| #define DEV_FC(file) ((struct fuse_conn *) (file)->private_data) |
| |
| |
| /** |
| * The proc entry for the client device ("/proc/fs/fuse/dev") |
| */ |
| extern struct proc_dir_entry *proc_fuse_dev; |
| |
| /** |
| * The lock to protect fuses structures |
| */ |
| extern spinlock_t fuse_lock; |
| |
| |
| /** |
| * Get a filled in inode |
| */ |
| struct inode *fuse_iget(struct super_block *sb, ino_t ino, |
| struct fuse_attr *attr, int version); |
| |
| |
| /** |
| * Initialise operations on regular file |
| */ |
| void fuse_init_file_inode(struct inode *inode); |
| |
| /** |
| * Check if the connection can be released, and if yes, then free the |
| * connection structure |
| */ |
| void fuse_release_conn(struct fuse_conn *fc); |
| |
| /** |
| * Initialize the client device |
| */ |
| int fuse_dev_init(void); |
| |
| /** |
| * Cleanup the client device |
| */ |
| void fuse_dev_cleanup(void); |
| |
| /** |
| * Initialize the fuse filesystem |
| */ |
| int fuse_fs_init(void); |
| |
| /** |
| * Cleanup the fuse filesystem |
| */ |
| void fuse_fs_cleanup(void); |
| |
| /** |
| * Send a request |
| * |
| */ |
| void request_send(struct fuse_conn *fc, struct fuse_in *in, |
| struct fuse_out *out); |
| |
| /** |
| * Send a request for which a reply is not expected |
| */ |
| int request_send_noreply(struct fuse_conn *fc, struct fuse_in *in); |
| |
| /** |
| * Get the attributes of a file |
| */ |
| int fuse_getattr(struct inode *inode); |
| |
| /* |
| * Local Variables: |
| * indent-tabs-mode: t |
| * c-basic-offset: 8 |
| */ |