![Miklos Szeredi](/assets/img/avatar_default.png)
Make each fuse device clone refer to a separate processing queue. The only constraint on userspace code is that the request answer must be written to the same device clone as it was read off. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
948 lines
22 KiB
C
948 lines
22 KiB
C
/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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*/
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#ifndef _FS_FUSE_I_H
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#define _FS_FUSE_I_H
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#include <linux/fuse.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/backing-dev.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/rbtree.h>
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#include <linux/poll.h>
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#include <linux/workqueue.h>
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/** Max number of pages that can be used in a single read request */
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#define FUSE_MAX_PAGES_PER_REQ 32
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/** Bias for fi->writectr, meaning new writepages must not be sent */
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#define FUSE_NOWRITE INT_MIN
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/** It could be as large as PATH_MAX, but would that have any uses? */
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#define FUSE_NAME_MAX 1024
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/** Number of dentries for each connection in the control filesystem */
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#define FUSE_CTL_NUM_DENTRIES 5
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/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
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module will check permissions based on the file mode. Otherwise no
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permission checking is done in the kernel */
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#define FUSE_DEFAULT_PERMISSIONS (1 << 0)
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/** If the FUSE_ALLOW_OTHER flag is given, then not only the user
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doing the mount will be allowed to access the filesystem */
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#define FUSE_ALLOW_OTHER (1 << 1)
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/** Number of page pointers embedded in fuse_req */
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#define FUSE_REQ_INLINE_PAGES 1
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/** List of active connections */
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extern struct list_head fuse_conn_list;
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/** Global mutex protecting fuse_conn_list and the control filesystem */
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extern struct mutex fuse_mutex;
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/** Module parameters */
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extern unsigned max_user_bgreq;
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extern unsigned max_user_congthresh;
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/* One forget request */
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struct fuse_forget_link {
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struct fuse_forget_one forget_one;
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struct fuse_forget_link *next;
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};
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/** FUSE inode */
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struct fuse_inode {
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/** Inode data */
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struct inode inode;
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/** Unique ID, which identifies the inode between userspace
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* and kernel */
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u64 nodeid;
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/** Number of lookups on this inode */
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u64 nlookup;
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/** The request used for sending the FORGET message */
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struct fuse_forget_link *forget;
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/** Time in jiffies until the file attributes are valid */
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u64 i_time;
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/** The sticky bit in inode->i_mode may have been removed, so
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preserve the original mode */
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umode_t orig_i_mode;
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/** 64 bit inode number */
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u64 orig_ino;
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/** Version of last attribute change */
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u64 attr_version;
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/** Files usable in writepage. Protected by fc->lock */
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struct list_head write_files;
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/** Writepages pending on truncate or fsync */
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struct list_head queued_writes;
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/** Number of sent writes, a negative bias (FUSE_NOWRITE)
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* means more writes are blocked */
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int writectr;
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/** Waitq for writepage completion */
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wait_queue_head_t page_waitq;
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/** List of writepage requestst (pending or sent) */
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struct list_head writepages;
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/** Miscellaneous bits describing inode state */
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unsigned long state;
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};
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/** FUSE inode state bits */
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enum {
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/** Advise readdirplus */
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FUSE_I_ADVISE_RDPLUS,
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/** Initialized with readdirplus */
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FUSE_I_INIT_RDPLUS,
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/** An operation changing file size is in progress */
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FUSE_I_SIZE_UNSTABLE,
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};
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struct fuse_conn;
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/** FUSE specific file data */
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struct fuse_file {
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/** Fuse connection for this file */
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struct fuse_conn *fc;
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/** Request reserved for flush and release */
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struct fuse_req *reserved_req;
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/** Kernel file handle guaranteed to be unique */
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u64 kh;
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/** File handle used by userspace */
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u64 fh;
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/** Node id of this file */
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u64 nodeid;
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/** Refcount */
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atomic_t count;
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/** FOPEN_* flags returned by open */
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u32 open_flags;
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/** Entry on inode's write_files list */
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struct list_head write_entry;
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/** RB node to be linked on fuse_conn->polled_files */
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struct rb_node polled_node;
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/** Wait queue head for poll */
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wait_queue_head_t poll_wait;
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/** Has flock been performed on this file? */
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bool flock:1;
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};
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/** One input argument of a request */
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struct fuse_in_arg {
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unsigned size;
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const void *value;
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};
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/** The request input */
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struct fuse_in {
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/** The request header */
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struct fuse_in_header h;
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/** True if the data for the last argument is in req->pages */
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unsigned argpages:1;
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/** Number of arguments */
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unsigned numargs;
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/** Array of arguments */
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struct fuse_in_arg args[3];
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};
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/** One output argument of a request */
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struct fuse_arg {
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unsigned size;
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void *value;
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};
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/** The request output */
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struct fuse_out {
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/** Header returned from userspace */
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struct fuse_out_header h;
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/*
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* The following bitfields are not changed during the request
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* processing
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*/
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/** Last argument is variable length (can be shorter than
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arg->size) */
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unsigned argvar:1;
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/** Last argument is a list of pages to copy data to */
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unsigned argpages:1;
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/** Zero partially or not copied pages */
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unsigned page_zeroing:1;
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/** Pages may be replaced with new ones */
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unsigned page_replace:1;
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/** Number or arguments */
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unsigned numargs;
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/** Array of arguments */
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struct fuse_arg args[2];
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};
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/** FUSE page descriptor */
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struct fuse_page_desc {
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unsigned int length;
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unsigned int offset;
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};
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struct fuse_args {
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struct {
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struct {
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uint32_t opcode;
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uint64_t nodeid;
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} h;
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unsigned numargs;
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struct fuse_in_arg args[3];
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} in;
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struct {
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unsigned argvar:1;
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unsigned numargs;
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struct fuse_arg args[2];
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} out;
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};
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#define FUSE_ARGS(args) struct fuse_args args = {}
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/** The request IO state (for asynchronous processing) */
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struct fuse_io_priv {
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int async;
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spinlock_t lock;
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unsigned reqs;
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ssize_t bytes;
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size_t size;
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__u64 offset;
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bool write;
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int err;
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struct kiocb *iocb;
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struct file *file;
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struct completion *done;
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};
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/**
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* Request flags
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*
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* FR_ISREPLY: set if the request has reply
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* FR_FORCE: force sending of the request even if interrupted
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* FR_BACKGROUND: request is sent in the background
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* FR_WAITING: request is counted as "waiting"
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* FR_ABORTED: the request was aborted
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* FR_INTERRUPTED: the request has been interrupted
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* FR_LOCKED: data is being copied to/from the request
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* FR_PENDING: request is not yet in userspace
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* FR_SENT: request is in userspace, waiting for an answer
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* FR_FINISHED: request is finished
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* FR_PRIVATE: request is on private list
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*/
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enum fuse_req_flag {
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FR_ISREPLY,
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FR_FORCE,
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FR_BACKGROUND,
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FR_WAITING,
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FR_ABORTED,
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FR_INTERRUPTED,
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FR_LOCKED,
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FR_PENDING,
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FR_SENT,
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FR_FINISHED,
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FR_PRIVATE,
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};
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/**
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* A request to the client
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*
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* .waitq.lock protects the following fields:
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* - FR_ABORTED
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* - FR_LOCKED (may also be modified under fc->lock, tested under both)
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*/
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struct fuse_req {
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/** This can be on either pending processing or io lists in
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fuse_conn */
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struct list_head list;
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/** Entry on the interrupts list */
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struct list_head intr_entry;
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/** refcount */
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atomic_t count;
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/** Unique ID for the interrupt request */
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u64 intr_unique;
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/* Request flags, updated with test/set/clear_bit() */
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unsigned long flags;
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/** The request input */
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struct fuse_in in;
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/** The request output */
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struct fuse_out out;
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/** Used to wake up the task waiting for completion of request*/
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wait_queue_head_t waitq;
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/** Data for asynchronous requests */
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union {
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struct {
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struct fuse_release_in in;
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struct inode *inode;
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} release;
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struct fuse_init_in init_in;
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struct fuse_init_out init_out;
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struct cuse_init_in cuse_init_in;
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struct {
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struct fuse_read_in in;
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u64 attr_ver;
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} read;
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struct {
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struct fuse_write_in in;
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struct fuse_write_out out;
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struct fuse_req *next;
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} write;
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struct fuse_notify_retrieve_in retrieve_in;
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} misc;
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/** page vector */
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struct page **pages;
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/** page-descriptor vector */
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struct fuse_page_desc *page_descs;
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/** size of the 'pages' array */
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unsigned max_pages;
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/** inline page vector */
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struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
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/** inline page-descriptor vector */
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struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
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/** number of pages in vector */
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unsigned num_pages;
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/** File used in the request (or NULL) */
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struct fuse_file *ff;
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/** Inode used in the request or NULL */
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struct inode *inode;
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/** AIO control block */
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struct fuse_io_priv *io;
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/** Link on fi->writepages */
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struct list_head writepages_entry;
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/** Request completion callback */
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void (*end)(struct fuse_conn *, struct fuse_req *);
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/** Request is stolen from fuse_file->reserved_req */
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struct file *stolen_file;
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};
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struct fuse_iqueue {
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/** Connection established */
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unsigned connected;
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/** Readers of the connection are waiting on this */
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wait_queue_head_t waitq;
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/** The next unique request id */
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u64 reqctr;
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/** The list of pending requests */
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struct list_head pending;
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/** Pending interrupts */
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struct list_head interrupts;
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/** Queue of pending forgets */
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struct fuse_forget_link forget_list_head;
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struct fuse_forget_link *forget_list_tail;
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/** Batching of FORGET requests (positive indicates FORGET batch) */
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int forget_batch;
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/** O_ASYNC requests */
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struct fasync_struct *fasync;
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};
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struct fuse_pqueue {
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/** Connection established */
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unsigned connected;
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/** Lock protecting accessess to members of this structure */
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spinlock_t lock;
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/** The list of requests being processed */
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struct list_head processing;
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/** The list of requests under I/O */
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struct list_head io;
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};
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/**
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* Fuse device instance
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*/
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struct fuse_dev {
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/** Fuse connection for this device */
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struct fuse_conn *fc;
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/** Processing queue */
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struct fuse_pqueue pq;
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/** list entry on fc->devices */
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struct list_head entry;
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};
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/**
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* A Fuse connection.
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*
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* This structure is created, when the filesystem is mounted, and is
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* destroyed, when the client device is closed and the filesystem is
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* unmounted.
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*/
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struct fuse_conn {
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/** Lock protecting accessess to members of this structure */
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spinlock_t lock;
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/** Refcount */
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atomic_t count;
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/** Number of fuse_dev's */
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atomic_t dev_count;
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struct rcu_head rcu;
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/** The user id for this mount */
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kuid_t user_id;
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/** The group id for this mount */
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kgid_t group_id;
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/** The fuse mount flags for this mount */
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unsigned flags;
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/** Maximum read size */
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unsigned max_read;
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/** Maximum write size */
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unsigned max_write;
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/** Input queue */
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struct fuse_iqueue iq;
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/** The next unique kernel file handle */
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u64 khctr;
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/** rbtree of fuse_files waiting for poll events indexed by ph */
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struct rb_root polled_files;
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/** Maximum number of outstanding background requests */
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unsigned max_background;
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/** Number of background requests at which congestion starts */
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unsigned congestion_threshold;
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/** Number of requests currently in the background */
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unsigned num_background;
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/** Number of background requests currently queued for userspace */
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unsigned active_background;
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/** The list of background requests set aside for later queuing */
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struct list_head bg_queue;
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/** Flag indicating that INIT reply has been received. Allocating
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* any fuse request will be suspended until the flag is set */
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int initialized;
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/** Flag indicating if connection is blocked. This will be
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the case before the INIT reply is received, and if there
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are too many outstading backgrounds requests */
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int blocked;
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/** waitq for blocked connection */
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wait_queue_head_t blocked_waitq;
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/** waitq for reserved requests */
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wait_queue_head_t reserved_req_waitq;
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/** Connection established, cleared on umount, connection
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abort and device release */
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unsigned connected;
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/** Connection failed (version mismatch). Cannot race with
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setting other bitfields since it is only set once in INIT
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reply, before any other request, and never cleared */
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unsigned conn_error:1;
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/** Connection successful. Only set in INIT */
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unsigned conn_init:1;
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/** Do readpages asynchronously? Only set in INIT */
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unsigned async_read:1;
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/** Do not send separate SETATTR request before open(O_TRUNC) */
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unsigned atomic_o_trunc:1;
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/** Filesystem supports NFS exporting. Only set in INIT */
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unsigned export_support:1;
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/** Set if bdi is valid */
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unsigned bdi_initialized:1;
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/** write-back cache policy (default is write-through) */
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unsigned writeback_cache:1;
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/*
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* The following bitfields are only for optimization purposes
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* and hence races in setting them will not cause malfunction
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*/
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/** Is open/release not implemented by fs? */
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unsigned no_open:1;
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/** Is fsync not implemented by fs? */
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unsigned no_fsync:1;
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/** Is fsyncdir not implemented by fs? */
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unsigned no_fsyncdir:1;
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/** Is flush not implemented by fs? */
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unsigned no_flush:1;
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/** Is setxattr not implemented by fs? */
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unsigned no_setxattr:1;
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/** Is getxattr not implemented by fs? */
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unsigned no_getxattr:1;
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/** Is listxattr not implemented by fs? */
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unsigned no_listxattr:1;
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/** Is removexattr not implemented by fs? */
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unsigned no_removexattr:1;
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/** Are posix file locking primitives not implemented by fs? */
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unsigned no_lock:1;
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/** Is access not implemented by fs? */
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unsigned no_access:1;
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/** Is create not implemented by fs? */
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unsigned no_create:1;
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/** Is interrupt not implemented by fs? */
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unsigned no_interrupt:1;
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/** Is bmap not implemented by fs? */
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unsigned no_bmap:1;
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/** Is poll not implemented by fs? */
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unsigned no_poll:1;
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/** Do multi-page cached writes */
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unsigned big_writes:1;
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/** Don't apply umask to creation modes */
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unsigned dont_mask:1;
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/** Are BSD file locking primitives not implemented by fs? */
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unsigned no_flock:1;
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/** Is fallocate not implemented by fs? */
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unsigned no_fallocate:1;
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/** Is rename with flags implemented by fs? */
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unsigned no_rename2:1;
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/** Use enhanced/automatic page cache invalidation. */
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unsigned auto_inval_data:1;
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/** Does the filesystem support readdirplus? */
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unsigned do_readdirplus:1;
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/** Does the filesystem want adaptive readdirplus? */
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unsigned readdirplus_auto:1;
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/** Does the filesystem support asynchronous direct-IO submission? */
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unsigned async_dio:1;
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/** 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;
|
|
|
|
/** 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;
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/* 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);
|
|
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 __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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
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);
|
|
|
|
void fuse_set_initialized(struct fuse_conn *fc);
|
|
|
|
#endif /* _FS_FUSE_I_H */
|