diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/fuse/fuse_i.h')
-rw-r--r-- | ANDROID_3.4.5/fs/fuse/fuse_i.h | 784 |
1 files changed, 0 insertions, 784 deletions
diff --git a/ANDROID_3.4.5/fs/fuse/fuse_i.h b/ANDROID_3.4.5/fs/fuse/fuse_i.h deleted file mode 100644 index d1819269..00000000 --- a/ANDROID_3.4.5/fs/fuse/fuse_i.h +++ /dev/null @@ -1,784 +0,0 @@ -/* - 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> - -/** 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 - -/** 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; - -/** 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; -}; - -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 */ - atomic_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[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 -}; - -/** - * 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 { - union { - struct fuse_release_in in; - struct work_struct work; - }; - struct path path; - } 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; - } write; - struct fuse_notify_retrieve_in retrieve_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 fuse_file *ff; - - /** Inode used in the request or NULL */ - struct inode *inode; - - /** 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; -}; - -/** - * 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; - - /** 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; - - /** 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; - - /** 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; - - /** 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; - - /** Set if bdi is valid */ - unsigned bdi_initialized: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 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; - - /** 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; - - /** 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; - - /** 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; - - /** 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; -}; - -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; - -/** - * 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, 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); - -/** - * 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); -struct fuse_file *fuse_file_get(struct fuse_file *ff); -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 fuse_ctl_cleanup(void); - -/** - * Allocate a request - */ -struct fuse_req *fuse_request_alloc(void); - -struct fuse_req *fuse_request_alloc_nofs(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 fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); - -/** - * 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); - -/** - * Invalidate inode attributes - */ -void fuse_invalidate_attr(struct inode *inode); - -void fuse_invalidate_entry_cache(struct dentry *entry); - -/** - * Acquire reference to fuse_conn - */ -struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); - -void fuse_conn_kill(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); - -/** - * 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); - -u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); - -int fuse_update_attributes(struct inode *inode, struct kstat *stat, - struct file *file, bool *refreshed); - -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); -ssize_t fuse_direct_io(struct file *file, const char __user *buf, - size_t count, loff_t *ppos, int write); -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); - -void fuse_write_update_size(struct inode *inode, loff_t pos); - -#endif /* _FS_FUSE_I_H */ |