| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
| |
| This program can be distributed under the terms of the GNU GPL. |
| See the file COPYING. |
| */ |
| |
| #ifndef _FS_FUSE_I_H |
| #define _FS_FUSE_I_H |
| |
| #include <linux/fuse.h> |
| #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> |
| #include <linux/mutex.h> |
| #include <linux/rwsem.h> |
| #include <linux/rbtree.h> |
| #include <linux/poll.h> |
| #include <linux/workqueue.h> |
| #include <linux/kref.h> |
| #include <linux/xattr.h> |
| #include <linux/pid_namespace.h> |
| #include <linux/refcount.h> |
| |
| /** Max number of pages that can be used in a single read request */ |
| #define FUSE_MAX_PAGES_PER_REQ 32 |
| |
| /** Bias for fi->writectr, meaning new writepages must not be sent */ |
| #define FUSE_NOWRITE INT_MIN |
| |
| /** 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 5 |
| |
| /** Number of page pointers embedded in fuse_req */ |
| #define FUSE_REQ_INLINE_PAGES 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; |
| |
| /** Module parameters */ |
| extern unsigned max_user_bgreq; |
| extern unsigned max_user_congthresh; |
| |
| /* One forget request */ |
| struct fuse_forget_link { |
| struct fuse_forget_one forget_one; |
| struct fuse_forget_link *next; |
| }; |
| |
| /** 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_forget_link *forget; |
| |
| /** Time in jiffies until the file attributes are valid */ |
| u64 i_time; |
| |
| /** The sticky bit in inode->i_mode may have been removed, so |
| preserve the original mode */ |
| umode_t orig_i_mode; |
| |
| /** 64 bit inode number */ |
| u64 orig_ino; |
| |
| /** Version of last attribute change */ |
| u64 attr_version; |
| |
| /** Files usable in writepage. Protected by fc->lock */ |
| struct list_head write_files; |
| |
| /** Writepages pending on truncate or fsync */ |
| struct list_head queued_writes; |
| |
| /** Number of sent writes, a negative bias (FUSE_NOWRITE) |
| * means more writes are blocked */ |
| int writectr; |
| |
| /** Waitq for writepage completion */ |
| wait_queue_head_t page_waitq; |
| |
| /** List of writepage requestst (pending or sent) */ |
| struct list_head writepages; |
| |
| /** Miscellaneous bits describing inode state */ |
| unsigned long state; |
| |
| /** Lock for serializing lookup and readdir for back compatibility*/ |
| struct mutex mutex; |
| }; |
| |
| /** FUSE inode state bits */ |
| enum { |
| /** Advise readdirplus */ |
| FUSE_I_ADVISE_RDPLUS, |
| /** Initialized with readdirplus */ |
| FUSE_I_INIT_RDPLUS, |
| /** An operation changing file size is in progress */ |
| FUSE_I_SIZE_UNSTABLE, |
| }; |
| |
| struct fuse_conn; |
| |
| /** FUSE specific file data */ |
| struct fuse_file { |
| /** Fuse connection for this file */ |
| struct fuse_conn *fc; |
| |
| /** Request reserved for flush and release */ |
| struct fuse_req *reserved_req; |
| |
| /** Kernel file handle guaranteed to be unique */ |
| u64 kh; |
| |
| /** File handle used by userspace */ |
| u64 fh; |
| |
| /** Node id of this file */ |
| u64 nodeid; |
| |
| /** Refcount */ |
| refcount_t count; |
| |
| /** FOPEN_* flags returned by open */ |
| u32 open_flags; |
| |
| /** Entry on inode's write_files list */ |
| struct list_head write_entry; |
| |
| /** RB node to be linked on fuse_conn->polled_files */ |
| struct rb_node polled_node; |
| |
| /** Wait queue head for poll */ |
| wait_queue_head_t poll_wait; |
| |
| /** Has flock been performed on this file? */ |
| bool flock:1; |
| }; |
| |
| /** 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; |
| |
| /** Pages may be replaced with new ones */ |
| unsigned page_replace:1; |
| |
| /** Number or arguments */ |
| unsigned numargs; |
| |
| /** Array of arguments */ |
| struct fuse_arg args[2]; |
| }; |
| |
| /** FUSE page descriptor */ |
| struct fuse_page_desc { |
| unsigned int length; |
| unsigned int offset; |
| }; |
| |
| struct fuse_args { |
| struct { |
| struct { |
| uint32_t opcode; |
| uint64_t nodeid; |
| } h; |
| unsigned numargs; |
| struct fuse_in_arg args[3]; |
| |
| } in; |
| struct { |
| unsigned argvar:1; |
| unsigned numargs; |
| struct fuse_arg args[2]; |
| } out; |
| }; |
| |
| #define FUSE_ARGS(args) struct fuse_args args = {} |
| |
| /** The request IO state (for asynchronous processing) */ |
| struct fuse_io_priv { |
| struct kref refcnt; |
| int async; |
| spinlock_t lock; |
| unsigned reqs; |
| ssize_t bytes; |
| size_t size; |
| __u64 offset; |
| bool write; |
| bool should_dirty; |
| int err; |
| struct kiocb *iocb; |
| struct completion *done; |
| bool blocking; |
| }; |
| |
| #define FUSE_IO_PRIV_SYNC(i) \ |
| { \ |
| .refcnt = KREF_INIT(1), \ |
| .async = 0, \ |
| .iocb = i, \ |
| } |
| |
| /** |
| * Request flags |
| * |
| * FR_ISREPLY: set if the request has reply |
| * FR_FORCE: force sending of the request even if interrupted |
| * FR_BACKGROUND: request is sent in the background |
| * FR_WAITING: request is counted as "waiting" |
| * FR_ABORTED: the request was aborted |
| * FR_INTERRUPTED: the request has been interrupted |
| * FR_LOCKED: data is being copied to/from the request |
| * FR_PENDING: request is not yet in userspace |
| * FR_SENT: request is in userspace, waiting for an answer |
| * FR_FINISHED: request is finished |
| * FR_PRIVATE: request is on private list |
| */ |
| enum fuse_req_flag { |
| FR_ISREPLY, |
| FR_FORCE, |
| FR_BACKGROUND, |
| FR_WAITING, |
| FR_ABORTED, |
| FR_INTERRUPTED, |
| FR_LOCKED, |
| FR_PENDING, |
| FR_SENT, |
| FR_FINISHED, |
| FR_PRIVATE, |
| }; |
| |
| /** |
| * A request to the client |
| * |
| * .waitq.lock protects the following fields: |
| * - FR_ABORTED |
| * - FR_LOCKED (may also be modified under fc->lock, tested under both) |
| */ |
| 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 */ |
| refcount_t count; |
| |
| /** Unique ID for the interrupt request */ |
| u64 intr_unique; |
| |
| /* Request flags, updated with test/set/clear_bit() */ |
| unsigned long flags; |
| |
| /** 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 { |
| struct fuse_release_in in; |
| struct inode *inode; |
| } release; |
| struct fuse_init_in init_in; |
| struct fuse_init_out init_out; |
| struct cuse_init_in cuse_init_in; |
| struct { |
| struct fuse_read_in in; |
| u64 attr_ver; |
| } read; |
| struct { |
| struct fuse_write_in in; |
| struct fuse_write_out out; |
| struct fuse_req *next; |
| } write; |
| struct fuse_notify_retrieve_in retrieve_in; |
| } misc; |
| |
| /** page vector */ |
| struct page **pages; |
| |
| /** page-descriptor vector */ |
| struct fuse_page_desc *page_descs; |
| |
| /** size of the 'pages' array */ |
| unsigned max_pages; |
| |
| /** inline page vector */ |
| struct page *inline_pages[FUSE_REQ_INLINE_PAGES]; |
| |
| /** inline page-descriptor vector */ |
| struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES]; |
| |
| /** number of pages in vector */ |
| unsigned num_pages; |
| |
| /** File used in the request (or NULL) */ |
| struct fuse_file *ff; |
| |
| /** Inode used in the request or NULL */ |
| struct inode *inode; |
| |
| /** AIO control block */ |
| struct fuse_io_priv *io; |
| |
| /** Link on fi->writepages */ |
| struct list_head writepages_entry; |
| |
| /** Request completion callback */ |
| void (*end)(struct fuse_conn *, struct fuse_req *); |
| |
| /** Request is stolen from fuse_file->reserved_req */ |
| struct file *stolen_file; |
| }; |
| |
| struct fuse_iqueue { |
| /** Connection established */ |
| unsigned connected; |
| |
| /** Readers of the connection are waiting on this */ |
| wait_queue_head_t waitq; |
| |
| /** The next unique request id */ |
| u64 reqctr; |
| |
| /** The list of pending requests */ |
| struct list_head pending; |
| |
| /** Pending interrupts */ |
| struct list_head interrupts; |
| |
| /** Queue of pending forgets */ |
| struct fuse_forget_link forget_list_head; |
| struct fuse_forget_link *forget_list_tail; |
| |
| /** Batching of FORGET requests (positive indicates FORGET batch) */ |
| int forget_batch; |
| |
| /** O_ASYNC requests */ |
| struct fasync_struct *fasync; |
| }; |
| |
| struct fuse_pqueue { |
| /** Connection established */ |
| unsigned connected; |
| |
| /** Lock protecting accessess to members of this structure */ |
| spinlock_t lock; |
| |
| /** The list of requests being processed */ |
| struct list_head processing; |
| |
| /** The list of requests under I/O */ |
| struct list_head io; |
| }; |
| |
| /** |
| * Fuse device instance |
| */ |
| struct fuse_dev { |
| /** Fuse connection for this device */ |
| struct fuse_conn *fc; |
| |
| /** Processing queue */ |
| struct fuse_pqueue pq; |
| |
| /** list entry on fc->devices */ |
| struct list_head entry; |
| }; |
| |
| /** |
| * 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; |
| |
| /** Refcount */ |
| refcount_t count; |
| |
| /** Number of fuse_dev's */ |
| atomic_t dev_count; |
| |
| struct rcu_head rcu; |
| |
| /** The user id for this mount */ |
| kuid_t user_id; |
| |
| /** The group id for this mount */ |
| kgid_t group_id; |
| |
| /** The pid namespace for this mount */ |
| struct pid_namespace *pid_ns; |
| |
| /** Maximum read size */ |
| unsigned max_read; |
| |
| /** Maximum write size */ |
| unsigned max_write; |
| |
| /** Input queue */ |
| struct fuse_iqueue iq; |
| |
| /** The next unique kernel file handle */ |
| u64 khctr; |
| |
| /** rbtree of fuse_files waiting for poll events indexed by ph */ |
| struct rb_root polled_files; |
| |
| /** Maximum number of outstanding background requests */ |
| unsigned max_background; |
| |
| /** Number of background requests at which congestion starts */ |
| unsigned congestion_threshold; |
| |
| /** Number of requests currently in the background */ |
| unsigned num_background; |
| |
| /** Number of background requests currently queued for userspace */ |
| unsigned active_background; |
| |
| /** The list of background requests set aside for later queuing */ |
| struct list_head bg_queue; |
| |
| /** Flag indicating that INIT reply has been received. Allocating |
| * any fuse request will be suspended until the flag is set */ |
| int initialized; |
| |
| /** 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; |
| |
| /** 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; |
| |
| /** Do not send separate SETATTR request before open(O_TRUNC) */ |
| unsigned atomic_o_trunc:1; |
| |
| /** Filesystem supports NFS exporting. Only set in INIT */ |
| unsigned export_support:1; |
| |
| /** write-back cache policy (default is write-through) */ |
| unsigned writeback_cache:1; |
| |
| /** allow parallel lookups and readdir (default is serialized) */ |
| unsigned parallel_dirops:1; |
| |
| /** handle fs handles killing suid/sgid/cap on write/chown/trunc */ |
| unsigned handle_killpriv:1; |
| |
| /* |
| * The following bitfields are only for optimization purposes |
| * and hence races in setting them will not cause malfunction |
| */ |
| |
| /** Is open/release not implemented by fs? */ |
| unsigned no_open:1; |
| |
| /** 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 posix 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; |
| |
| /** Is poll not implemented by fs? */ |
| unsigned no_poll:1; |
| |
| /** Do multi-page cached writes */ |
| unsigned big_writes:1; |
| |
| /** Don't apply umask to creation modes */ |
| unsigned dont_mask:1; |
| |
| /** Are BSD file locking primitives not implemented by fs? */ |
| unsigned no_flock:1; |
| |
| /** Is fallocate not implemented by fs? */ |
| unsigned no_fallocate:1; |
| |
| /** Is rename with flags implemented by fs? */ |
| unsigned no_rename2:1; |
| |
| /** Use enhanced/automatic page cache invalidation. */ |
| unsigned auto_inval_data:1; |
| |
| /** Does the filesystem support readdirplus? */ |
| unsigned do_readdirplus:1; |
| |
| /** Does the filesystem want adaptive readdirplus? */ |
| unsigned readdirplus_auto:1; |
| |
| /** Does the filesystem support asynchronous direct-IO submission? */ |
| unsigned async_dio:1; |
| |
| /** Is lseek not implemented by fs? */ |
| unsigned no_lseek:1; |
| |
| /** Does the filesystem support posix acls? */ |
| unsigned posix_acl:1; |
| |
| /** Check permissions based on the file mode or not? */ |
| unsigned default_permissions:1; |
| |
| /** Allow other than the mounter user to access the filesystem ? */ |
| unsigned allow_other:1; |
| |
| /** The number of requests waiting for completion */ |
| atomic_t num_waiting; |
| |
| /** Negotiated minor version */ |
| unsigned minor; |
| |
| /** Entry on the fuse_conn_list */ |
| struct list_head entry; |
| |
| /** Device ID from super block */ |
| dev_t dev; |
| |
| /** Dentries in the control filesystem */ |
| struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; |
| |
| /** number of dentries used in the above array */ |
| int ctl_ndents; |
| |
| /** Key for lock owner ID scrambling */ |
| u32 scramble_key[4]; |
| |
| /** Reserved request for the DESTROY message */ |
| struct fuse_req *destroy_req; |
| |
| /** Version counter for attribute changes */ |
| u64 attr_version; |
| |
| /** Called on final put */ |
| void (*release)(struct fuse_conn *); |
| |
| /** Super block for this connection. */ |
| struct super_block *sb; |
| |
| /** Read/write semaphore to hold when accessing sb. */ |
| struct rw_semaphore killsb; |
| |
| /** List of device instances belonging to this connection */ |
| struct list_head devices; |
| }; |
| |
| 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 const struct file_operations fuse_dev_operations; |
| |
| extern const struct dentry_operations fuse_dentry_operations; |
| extern const struct dentry_operations fuse_root_dentry_operations; |
| |
| /** |
| * Inode to nodeid comparison. |
| */ |
| int fuse_inode_eq(struct inode *inode, void *_nodeidp); |
| |
| /** |
| * Get a filled in inode |
| */ |
| struct inode *fuse_iget(struct super_block *sb, u64 nodeid, |
| int generation, struct fuse_attr *attr, |
| u64 attr_valid, u64 attr_version); |
| |
| int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
| struct fuse_entry_out *outarg, struct inode **inode); |
| |
| /** |
| * Send FORGET command |
| */ |
| void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, |
| u64 nodeid, u64 nlookup); |
| |
| struct fuse_forget_link *fuse_alloc_forget(void); |
| |
| /* Used by READDIRPLUS */ |
| void fuse_force_forget(struct file *file, u64 nodeid); |
| |
| /** |
| * Initialize READ or READDIR request |
| */ |
| void fuse_read_fill(struct fuse_req *req, struct file *file, |
| loff_t pos, size_t count, int opcode); |
| |
| /** |
| * Send OPEN or OPENDIR request |
| */ |
| int fuse_open_common(struct inode *inode, struct file *file, bool isdir); |
| |
| struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); |
| void fuse_file_free(struct fuse_file *ff); |
| void fuse_finish_open(struct inode *inode, struct file *file); |
| |
| void fuse_sync_release(struct fuse_file *ff, int flags); |
| |
| /** |
| * Send RELEASE or RELEASEDIR request |
| */ |
| void fuse_release_common(struct file *file, int opcode); |
| |
| /** |
| * Send FSYNC or FSYNCDIR request |
| */ |
| int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
| int datasync, int isdir); |
| |
| /** |
| * Notify poll wakeup |
| */ |
| int fuse_notify_poll_wakeup(struct fuse_conn *fc, |
| struct fuse_notify_poll_wakeup_out *outarg); |
| |
| /** |
| * 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, |
| u64 attr_valid, u64 attr_version); |
| |
| void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, |
| u64 attr_valid); |
| |
| /** |
| * Initialize the client device |
| */ |
| int fuse_dev_init(void); |
| |
| /** |
| * Cleanup the client device |
| */ |
| void fuse_dev_cleanup(void); |
| |
| int fuse_ctl_init(void); |
| void __exit fuse_ctl_cleanup(void); |
| |
| /** |
| * Allocate a request |
| */ |
| struct fuse_req *fuse_request_alloc(unsigned npages); |
| |
| struct fuse_req *fuse_request_alloc_nofs(unsigned npages); |
| |
| /** |
| * Free a request |
| */ |
| void fuse_request_free(struct fuse_req *req); |
| |
| /** |
| * Get a request, may fail with -ENOMEM, |
| * caller should specify # elements in req->pages[] explicitly |
| */ |
| struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages); |
| struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, |
| unsigned npages); |
| |
| /* |
| * Increment reference count on request |
| */ |
| void __fuse_get_request(struct fuse_req *req); |
| |
| /** |
| * Gets a requests for a file operation, always succeeds |
| */ |
| struct fuse_req *fuse_get_req_nofail_nopages(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 fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); |
| |
| /** |
| * Simple request sending that does request allocation and freeing |
| */ |
| ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args); |
| |
| /** |
| * Send a request in the background |
| */ |
| void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req); |
| |
| void fuse_request_send_background_locked(struct fuse_conn *fc, |
| struct fuse_req *req); |
| |
| /* Abort all requests */ |
| void fuse_abort_conn(struct fuse_conn *fc); |
| void fuse_wait_aborted(struct fuse_conn *fc); |
| |
| /** |
| * Invalidate inode attributes |
| */ |
| void fuse_invalidate_attr(struct inode *inode); |
| |
| void fuse_invalidate_entry_cache(struct dentry *entry); |
| |
| void fuse_invalidate_atime(struct inode *inode); |
| |
| /** |
| * Acquire reference to fuse_conn |
| */ |
| struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); |
| |
| /** |
| * Initialize fuse_conn |
| */ |
| void fuse_conn_init(struct fuse_conn *fc); |
| |
| /** |
| * Release reference to fuse_conn |
| */ |
| void fuse_conn_put(struct fuse_conn *fc); |
| |
| struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc); |
| void fuse_dev_free(struct fuse_dev *fud); |
| |
| /** |
| * 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 current process allowed to perform filesystem operation? |
| */ |
| int fuse_allow_current_process(struct fuse_conn *fc); |
| |
| u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); |
| |
| void fuse_update_ctime(struct inode *inode); |
| |
| int fuse_update_attributes(struct inode *inode, struct file *file); |
| |
| void fuse_flush_writepages(struct inode *inode); |
| |
| void fuse_set_nowrite(struct inode *inode); |
| void fuse_release_nowrite(struct inode *inode); |
| |
| u64 fuse_get_attr_version(struct fuse_conn *fc); |
| |
| /** |
| * File-system tells the kernel to invalidate cache for the given node id. |
| */ |
| int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, |
| loff_t offset, loff_t len); |
| |
| /** |
| * File-system tells the kernel to invalidate parent attributes and |
| * the dentry matching parent/name. |
| * |
| * If the child_nodeid is non-zero and: |
| * - matches the inode number for the dentry matching parent/name, |
| * - is not a mount point |
| * - is a file or oan empty directory |
| * then the dentry is unhashed (d_delete()). |
| */ |
| int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
| u64 child_nodeid, struct qstr *name); |
| |
| int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
| bool isdir); |
| |
| /** |
| * fuse_direct_io() flags |
| */ |
| |
| /** If set, it is WRITE; otherwise - READ */ |
| #define FUSE_DIO_WRITE (1 << 0) |
| |
| /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */ |
| #define FUSE_DIO_CUSE (1 << 1) |
| |
| ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
| loff_t *ppos, int flags); |
| long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
| unsigned int flags); |
| long fuse_ioctl_common(struct file *file, unsigned int cmd, |
| unsigned long arg, unsigned int flags); |
| unsigned fuse_file_poll(struct file *file, poll_table *wait); |
| int fuse_dev_release(struct inode *inode, struct file *file); |
| |
| bool fuse_write_update_size(struct inode *inode, loff_t pos); |
| |
| int fuse_flush_times(struct inode *inode, struct fuse_file *ff); |
| int fuse_write_inode(struct inode *inode, struct writeback_control *wbc); |
| |
| int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
| struct file *file); |
| |
| void fuse_set_initialized(struct fuse_conn *fc); |
| |
| void fuse_unlock_inode(struct inode *inode, bool locked); |
| bool fuse_lock_inode(struct inode *inode); |
| |
| int fuse_setxattr(struct inode *inode, const char *name, const void *value, |
| size_t size, int flags); |
| ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value, |
| size_t size); |
| ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size); |
| int fuse_removexattr(struct inode *inode, const char *name); |
| extern const struct xattr_handler *fuse_xattr_handlers[]; |
| extern const struct xattr_handler *fuse_acl_xattr_handlers[]; |
| |
| struct posix_acl; |
| struct posix_acl *fuse_get_acl(struct inode *inode, int type); |
| int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type); |
| |
| #endif /* _FS_FUSE_I_H */ |