diff options
Diffstat (limited to 'fs/fuse/fuse_i.h')
| -rw-r--r-- | fs/fuse/fuse_i.h | 438 |
1 files changed, 368 insertions, 70 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 67aaf6ee38e..e8e47a6ab51 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -1,11 +1,14 @@ /* FUSE: Filesystem in Userspace - Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> + 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> @@ -15,21 +18,22 @@ #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 -/** Maximum number of outstanding background requests */ -#define FUSE_MAX_BACKGROUND 12 - -/** Congestion starts at 75% of maximum */ -#define FUSE_CONGESTION_THRESHOLD (FUSE_MAX_BACKGROUND * 75 / 100) +/** 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 3 +#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 @@ -40,12 +44,25 @@ doing the mount will be allowed to access the filesystem */ #define FUSE_ALLOW_OTHER (1 << 1) +/** 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 */ @@ -59,35 +76,87 @@ struct fuse_inode { u64 nlookup; /** The request used for sending the FORGET message */ - struct fuse_req *forget_req; + 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 */ - mode_t orig_i_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; }; +/** 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 */ 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 */ @@ -137,6 +206,9 @@ struct fuse_out { /** 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; @@ -144,6 +216,12 @@ struct fuse_out { struct fuse_arg args[3]; }; +/** FUSE page descriptor */ +struct fuse_page_desc { + unsigned int length; + unsigned int offset; +}; + /** The request state */ enum fuse_req_state { FUSE_REQ_INIT = 0, @@ -154,7 +232,19 @@ enum fuse_req_state { FUSE_REQ_FINISHED }; -struct fuse_conn; +/** The request IO state (for asynchronous processing) */ +struct fuse_io_priv { + int async; + spinlock_t lock; + unsigned reqs; + ssize_t bytes; + size_t size; + __u64 offset; + bool write; + int err; + struct kiocb *iocb; + struct file *file; +}; /** * A request to the client @@ -214,34 +304,59 @@ struct fuse_req { /** Data for asynchronous requests */ union { - struct fuse_forget_in forget_in; struct { - struct fuse_release_in in; - struct vfsmount *vfsmount; - struct dentry *dentry; + 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 fuse_read_in read_in; + 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; struct fuse_lk_in lk_in; } misc; /** page vector */ - struct page *pages[FUSE_MAX_PAGES_PER_REQ]; + 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; - /** 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; + + /** 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 *); @@ -260,17 +375,16 @@ 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; + struct rcu_head rcu; + /** The user id for this mount */ - uid_t user_id; + kuid_t user_id; /** The group id for this mount */ - gid_t group_id; + kgid_t group_id; /** The fuse mount flags for this mount */ unsigned flags; @@ -293,6 +407,18 @@ struct fuse_conn { /** 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; @@ -305,6 +431,17 @@ struct fuse_conn { /** 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 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 */ @@ -326,57 +463,99 @@ struct fuse_conn { /** 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; + unsigned conn_error:1; /** Connection successful. Only set in INIT */ - unsigned conn_init : 1; + unsigned conn_init:1; /** Do readpages asynchronously? Only set in INIT */ - unsigned async_read : 1; + unsigned async_read:1; /** Do not send separate SETATTR request before open(O_TRUNC) */ - unsigned atomic_o_trunc : 1; + 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; + + /** write-back cache policy (default is write-through) */ + unsigned writeback_cache: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; + unsigned no_fsync:1; /** Is fsyncdir not implemented by fs? */ - unsigned no_fsyncdir : 1; + unsigned no_fsyncdir:1; /** Is flush not implemented by fs? */ - unsigned no_flush : 1; + unsigned no_flush:1; /** Is setxattr not implemented by fs? */ - unsigned no_setxattr : 1; + unsigned no_setxattr:1; /** Is getxattr not implemented by fs? */ - unsigned no_getxattr : 1; + unsigned no_getxattr:1; /** Is listxattr not implemented by fs? */ - unsigned no_listxattr : 1; + unsigned no_listxattr:1; /** Is removexattr not implemented by fs? */ - unsigned no_removexattr : 1; + unsigned no_removexattr:1; - /** Are file locking primitives not implemented by fs? */ - unsigned no_lock : 1; + /** Are posix file locking primitives not implemented by fs? */ + unsigned no_lock:1; /** Is access not implemented by fs? */ - unsigned no_access : 1; + unsigned no_access:1; /** Is create not implemented by fs? */ - unsigned no_create : 1; + unsigned no_create:1; /** Is interrupt not implemented by fs? */ - unsigned no_interrupt : 1; + unsigned no_interrupt:1; /** Is bmap not implemented by fs? */ - unsigned no_bmap : 1; + 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; /** The number of requests waiting for completion */ atomic_t num_waiting; @@ -390,8 +569,8 @@ struct fuse_conn { /** Entry on the fuse_conn_list */ struct list_head entry; - /** Unique ID */ - u64 id; + /** Device ID from super block */ + dev_t dev; /** Dentries in the control filesystem */ struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; @@ -410,6 +589,15 @@ struct fuse_conn { /** 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) @@ -435,48 +623,68 @@ static inline u64 get_node_id(struct inode *inode) /** 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, unsigned long nodeid, +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_send_forget(struct fuse_conn *fc, struct fuse_req *req, - unsigned long nodeid, u64 nlookup); +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, - struct inode *inode, loff_t pos, size_t count, int opcode); + 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); +int fuse_open_common(struct inode *inode, struct file *file, bool isdir); -struct fuse_file *fuse_file_alloc(void); +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, - struct fuse_file *ff, struct fuse_open_out *outarg); +void fuse_finish_open(struct inode *inode, struct file *file); -/** Fill in ff->reserved_req with a RELEASE request */ -void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode); +void fuse_sync_release(struct fuse_file *ff, int flags); /** * Send RELEASE or RELEASEDIR request */ -int fuse_release_common(struct inode *inode, struct file *file, int isdir); +void fuse_release_common(struct file *file, int opcode); /** * Send FSYNC or FSYNCDIR request */ -int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, - int isdir); +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 @@ -504,6 +712,9 @@ void fuse_init_symlink(struct inode *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 */ @@ -515,12 +726,14 @@ int fuse_dev_init(void); void fuse_dev_cleanup(void); int fuse_ctl_init(void); -void fuse_ctl_cleanup(void); +void __exit fuse_ctl_cleanup(void); /** * Allocate a request */ -struct fuse_req *fuse_request_alloc(void); +struct fuse_req *fuse_request_alloc(unsigned npages); + +struct fuse_req *fuse_request_alloc_nofs(unsigned npages); /** * Free a request @@ -528,14 +741,32 @@ struct fuse_req *fuse_request_alloc(void); void fuse_request_free(struct fuse_req *req); /** - * Get a request, may fail with -ENOMEM + * 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); + +/** + * Get a request, may fail with -ENOMEM, + * useful for callers who doesn't use req->pages[] */ -struct fuse_req *fuse_get_req(struct fuse_conn *fc); +static inline struct fuse_req *fuse_get_req_nopages(struct fuse_conn *fc) +{ + return fuse_get_req(fc, 0); +} /** * Gets a requests for a file operation, always succeeds */ -struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file); +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 @@ -546,17 +777,15 @@ 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); +void fuse_request_send(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); +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); @@ -566,11 +795,22 @@ void fuse_abort_conn(struct fuse_conn *fc); */ 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); +void fuse_conn_kill(struct fuse_conn *fc); + +/** + * Initialize fuse_conn + */ +void fuse_conn_init(struct fuse_conn *fc); + /** * Release reference to fuse_conn */ @@ -592,11 +832,69 @@ void fuse_ctl_remove_conn(struct fuse_conn *fc); int fuse_valid_type(int m); /** - * Is task allowed to perform filesystem operation? + * Is current process allowed to perform filesystem operation? */ -int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task); +int fuse_allow_current_process(struct fuse_conn *fc); 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); + +/** + * 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 inode *inode, struct iattr *attr, + struct file *file); + +#endif /* _FS_FUSE_I_H */ |