diff options
Diffstat (limited to 'kernel/fuse_i.h')
| -rw-r--r-- | kernel/fuse_i.h | 654 |
1 files changed, 0 insertions, 654 deletions
diff --git a/kernel/fuse_i.h b/kernel/fuse_i.h deleted file mode 100644 index a43fc97..0000000 --- a/kernel/fuse_i.h +++ /dev/null @@ -1,654 +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. -*/ - -#ifdef FUSE_MAINLINE -#include <linux/fuse.h> -#else -#include <linux/version.h> - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9) -#error Kernel versions earlier than 2.6.9 are not supported -#endif - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10) -# define KERNEL_2_6_10_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,11) -# define KERNEL_2_6_11_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12) -# define KERNEL_2_6_12_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13) -# define KERNEL_2_6_13_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) -# define KERNEL_2_6_16_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) -# define KERNEL_2_6_17_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18) -# define KERNEL_2_6_18_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) -# define KERNEL_2_6_19_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) -# define KERNEL_2_6_21_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) -# define KERNEL_2_6_22_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) -# define KERNEL_2_6_23_PLUS -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) -# define KERNEL_2_6_24_PLUS -#endif - -#if defined(__arm__) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) -#define DCACHE_BUG -#endif -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15) -#define kmem_cache kmem_cache_s -#endif - -#include "fuse_kernel.h" -#include "config.h" -#endif /* FUSE_MAINLINE */ -#include <linux/fs.h> -#include <linux/mount.h> -#include <linux/wait.h> -#include <linux/list.h> -#include <linux/spinlock.h> -#include <linux/mm.h> -#include <linux/backing-dev.h> -#ifdef HAVE_MUTEX_H -#include <linux/mutex.h> -#else -#include <asm/semaphore.h> -#define DEFINE_MUTEX(m) DECLARE_MUTEX(m) -#define mutex_init(m) init_MUTEX(m) -#define mutex_destroy(m) do { } while (0) -#define mutex_lock(m) down(m) -#define mutex_unlock(m) up(m) -#define mutex semaphore -#endif -#ifndef HAVE_I_MUTEX -#ifndef mutex_destroy -/* Some RHEL kernels include a backported mutex.h, which lacks mutex_destroy */ -#define mutex_destroy(m) do { } while (0) -#endif -#define i_mutex i_sem /* Hack for struct inode */ -#endif -#ifndef KERNEL_2_6_19_PLUS -#define clear_nlink(inode) (inode)->i_nlink = 0 -#define inc_nlink(inode) (inode)->i_nlink++ -#endif -#ifndef HAVE_CONFIG_BLOCK -#define CONFIG_BLOCK -#endif -#ifndef FS_HAS_SUBTYPE -#define FS_HAS_SUBTYPE 0 -#endif -#ifndef FS_SAFE -#define FS_SAFE 0 -#endif - -/** Max number of pages that can be used in a single read request */ -#define FUSE_MAX_PAGES_PER_REQ 32 - -/** Maximum number of outstanding background requests */ -#define FUSE_MAX_BACKGROUND 10 - -/** It could be as large as PATH_MAX, but would that have any uses? */ -#define FUSE_NAME_MAX 1024 - -/** Number of dentries for each connection in the control filesystem */ -#define FUSE_CTL_NUM_DENTRIES 3 - -/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem - module will check permissions based on the file mode. Otherwise no - permission checking is done in the kernel */ -#define FUSE_DEFAULT_PERMISSIONS (1 << 0) - -/** If the FUSE_ALLOW_OTHER flag is given, then not only the user - doing the mount will be allowed to access the filesystem */ -#define FUSE_ALLOW_OTHER (1 << 1) - -/** List of active connections */ -extern struct list_head fuse_conn_list; - -/** Global mutex protecting fuse_conn_list and the control filesystem */ -extern struct mutex fuse_mutex; - -/** FUSE inode */ -struct fuse_inode { - /** Inode data */ - struct inode inode; - - /** Unique ID, which identifies the inode between userspace - * and kernel */ - u64 nodeid; - - /** Number of lookups on this inode */ - u64 nlookup; - - /** The request used for sending the FORGET message */ - struct fuse_req *forget_req; - - /** Time in jiffies until the file attributes are valid */ - u64 i_time; -}; - -/** FUSE specific file data */ -struct fuse_file { - /** Request reserved for flush and release */ - struct fuse_req *reserved_req; - - /** File handle used by userspace */ - u64 fh; -}; - -/** One input argument of a request */ -struct fuse_in_arg { - unsigned size; - const void *value; -}; - -/** The request input */ -struct fuse_in { - /** The request header */ - struct fuse_in_header h; - - /** True if the data for the last argument is in req->pages */ - unsigned argpages:1; - - /** Number of arguments */ - unsigned numargs; - - /** Array of arguments */ - struct fuse_in_arg args[3]; -}; - -/** One output argument of a request */ -struct fuse_arg { - unsigned size; - void *value; -}; - -/** The request output */ -struct fuse_out { - /** Header returned from userspace */ - struct fuse_out_header h; - - /* - * The following bitfields are not changed during the request - * processing - */ - - /** Last argument is variable length (can be shorter than - arg->size) */ - unsigned argvar:1; - - /** Last argument is a list of pages to copy data to */ - unsigned argpages:1; - - /** Zero partially or not copied pages */ - unsigned page_zeroing:1; - - /** Number or arguments */ - unsigned numargs; - - /** Array of arguments */ - struct fuse_arg args[3]; -}; - -/** The request state */ -enum fuse_req_state { - FUSE_REQ_INIT = 0, - FUSE_REQ_PENDING, - FUSE_REQ_READING, - FUSE_REQ_SENT, - FUSE_REQ_WRITING, - FUSE_REQ_FINISHED -}; - -struct fuse_conn; - -/** - * A request to the client - */ -struct fuse_req { - /** This can be on either pending processing or io lists in - fuse_conn */ - struct list_head list; - - /** Entry on the interrupts list */ - struct list_head intr_entry; - - /** refcount */ - atomic_t count; - - /** Unique ID for the interrupt request */ - u64 intr_unique; - - /* - * The following bitfields are either set once before the - * request is queued or setting/clearing them is protected by - * fuse_conn->lock - */ - - /** True if the request has reply */ - unsigned isreply:1; - - /** Force sending of the request even if interrupted */ - unsigned force:1; - - /** The request was aborted */ - unsigned aborted:1; - - /** Request is sent in the background */ - unsigned background:1; - - /** The request has been interrupted */ - unsigned interrupted:1; - - /** Data is being copied to/from the request */ - unsigned locked:1; - - /** Request is counted as "waiting" */ - unsigned waiting:1; - - /** State of the request */ - enum fuse_req_state state; - - /** 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; - - /** Data for asynchronous requests */ - union { - struct fuse_forget_in forget_in; - struct fuse_release_in release_in; - struct fuse_init_in init_in; - struct fuse_init_out init_out; - struct fuse_read_in read_in; - struct fuse_lk_in lk_in; - } misc; - - /** page vector */ - struct page *pages[FUSE_MAX_PAGES_PER_REQ]; - - /** number of pages in vector */ - unsigned num_pages; - - /** offset of data on first page */ - unsigned page_offset; - - /** File used in the request (or NULL) */ - struct file *file; - - /** vfsmount used in release */ - struct vfsmount *vfsmount; - - /** dentry used in release */ - struct dentry *dentry; - - /** Request completion callback */ - void (*end)(struct fuse_conn *, struct fuse_req *); - - /** Request is stolen from fuse_file->reserved_req */ - struct file *stolen_file; -}; - -/** - * A Fuse connection. - * - * This structure is created, when the filesystem is mounted, and is - * destroyed, when the client device is closed and the filesystem is - * unmounted. - */ -struct fuse_conn { - /** Lock protecting accessess to members of this structure */ - spinlock_t lock; - - /** Mutex protecting against directory alias creation */ - struct mutex inst_mutex; - - /** Refcount */ - atomic_t count; - - /** The user id for this mount */ - uid_t user_id; - - /** The group id for this mount */ - gid_t group_id; - - /** The fuse mount flags for this mount */ - unsigned flags; - - /** Maximum read size */ - unsigned max_read; - - /** Maximum write size */ - unsigned max_write; - - /** 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; - - /** The list of requests under I/O */ - struct list_head io; - - /** Number of requests currently in the background */ - unsigned num_background; - - /** Pending interrupts */ - struct list_head interrupts; - - /** Flag indicating if connection is blocked. This will be - the case before the INIT reply is received, and if there - are too many outstading backgrounds requests */ - int blocked; - - /** waitq for blocked connection */ - wait_queue_head_t blocked_waitq; - - /** waitq for reserved requests */ - wait_queue_head_t reserved_req_waitq; - - /** The next unique request id */ - u64 reqctr; - - /** Connection established, cleared on umount, connection - abort and device release */ - unsigned connected; - - /** Connection failed (version mismatch). Cannot race with - setting other bitfields since it is only set once in INIT - reply, before any other request, and never cleared */ - unsigned conn_error : 1; - - /** Connection successful. Only set in INIT */ - unsigned conn_init : 1; - - /** Do readpages asynchronously? Only set in INIT */ - unsigned async_read : 1; - - /* - * The following bitfields are only for optimization purposes - * and hence races in setting them will not cause malfunction - */ - - /** Is fsync not implemented by fs? */ - unsigned no_fsync : 1; - - /** Is fsyncdir not implemented by fs? */ - unsigned no_fsyncdir : 1; - - /** Is flush not implemented by fs? */ - unsigned no_flush : 1; - - /** Is setxattr not implemented by fs? */ - unsigned no_setxattr : 1; - - /** Is getxattr not implemented by fs? */ - unsigned no_getxattr : 1; - - /** Is listxattr not implemented by fs? */ - unsigned no_listxattr : 1; - - /** Is removexattr not implemented by fs? */ - unsigned no_removexattr : 1; - - /** Are file locking primitives not implemented by fs? */ - unsigned no_lock : 1; - - /** Is access not implemented by fs? */ - unsigned no_access : 1; - - /** Is create not implemented by fs? */ - unsigned no_create : 1; - - /** Is interrupt not implemented by fs? */ - unsigned no_interrupt : 1; - - /** Is bmap not implemented by fs? */ - unsigned no_bmap : 1; - - /** The number of requests waiting for completion */ - atomic_t num_waiting; - - /** Negotiated minor version */ - unsigned minor; - - /** Backing dev info */ - struct backing_dev_info bdi; - - /** Entry on the fuse_conn_list */ - struct list_head entry; - - /** Unique ID */ - u64 id; - - /** Dentries in the control filesystem */ - struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; - - /** number of dentries used in the above array */ - int ctl_ndents; - - /** O_ASYNC requests */ - struct fasync_struct *fasync; - - /** Key for lock owner ID scrambling */ - u32 scramble_key[4]; - - /** Reserved request for the DESTROY message */ - struct fuse_req *destroy_req; -}; - -static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) -{ - return sb->s_fs_info; -} - -static inline struct fuse_conn *get_fuse_conn(struct inode *inode) -{ - return get_fuse_conn_super(inode->i_sb); -} - -static inline struct fuse_inode *get_fuse_inode(struct inode *inode) -{ - return container_of(inode, struct fuse_inode, inode); -} - -static inline u64 get_node_id(struct inode *inode) -{ - return get_fuse_inode(inode)->nodeid; -} - -/** Device operations */ -extern struct file_operations fuse_dev_operations; - -/** - * Get a filled in inode - */ -struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, - int generation, struct fuse_attr *attr); - -/** - * Send FORGET command - */ -void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, - unsigned long nodeid, u64 nlookup); - -/** - * Initialize READ or READDIR request - */ -void fuse_read_fill(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, int opcode); - -/** - * Send OPEN or OPENDIR request - */ -int fuse_open_common(struct inode *inode, struct file *file, int isdir); - -struct fuse_file *fuse_file_alloc(void); -void fuse_file_free(struct fuse_file *ff); -void fuse_finish_open(struct inode *inode, struct file *file, - struct fuse_file *ff, struct fuse_open_out *outarg); - -/** */ -struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, - int opcode); -/** - * Send RELEASE or RELEASEDIR request - */ -int fuse_release_common(struct inode *inode, struct file *file, int isdir); - -/** - * Send FSYNC or FSYNCDIR request - */ -int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, - int isdir); - -/** - * Initialize file operations on a regular file - */ -void fuse_init_file_inode(struct inode *inode); - -/** - * Initialize inode operations on regular files and special files - */ -void fuse_init_common(struct inode *inode); - -/** - * Initialize inode and file operations on a directory - */ -void fuse_init_dir(struct inode *inode); - -/** - * Initialize inode operations on a symlink - */ -void fuse_init_symlink(struct inode *inode); - -/** - * Change attributes of an inode - */ -void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr); - -/** - * Initialize the client device - */ -int fuse_dev_init(void); - -/** - * Cleanup the client device - */ -void fuse_dev_cleanup(void); - -int fuse_ctl_init(void); -void fuse_ctl_cleanup(void); - -/** - * Allocate a request - */ -struct fuse_req *fuse_request_alloc(void); - -/** - * Free a request - */ -void fuse_request_free(struct fuse_req *req); - -/** - * Get a request, may fail with -ENOMEM - */ -struct fuse_req *fuse_get_req(struct fuse_conn *fc); - -/** - * Gets a requests for a file operation, always succeeds - */ -struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file); - -/** - * Decrement reference count of a request. If count goes to zero free - * the request. - */ -void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); - -/** - * Send a request (synchronous) - */ -void request_send(struct fuse_conn *fc, struct fuse_req *req); - -/** - * Send a request with no reply - */ -void request_send_noreply(struct fuse_conn *fc, struct fuse_req *req); - -/** - * Send a request in the background - */ -void request_send_background(struct fuse_conn *fc, struct fuse_req *req); - -/* Abort all requests */ -void fuse_abort_conn(struct fuse_conn *fc); - -/** - * Get the attributes of a file - */ -int fuse_do_getattr(struct inode *inode); - -/** - * Invalidate inode attributes - */ -void fuse_invalidate_attr(struct inode *inode); - -/** - * Acquire reference to fuse_conn - */ -struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); - -/** - * Release reference to fuse_conn - */ -void fuse_conn_put(struct fuse_conn *fc); - -/** - * Add connection to control filesystem - */ -int fuse_ctl_add_conn(struct fuse_conn *fc); - -/** - * Remove connection from control filesystem - */ -void fuse_ctl_remove_conn(struct fuse_conn *fc); - -/** - * Is file type valid? - */ -int fuse_valid_type(int m); - -/** - * Is task allowed to perform filesystem operation? - */ -int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task); - -extern struct dentry_operations fuse_dentry_operations; |