1323 строки
33 KiB
C
1323 строки
33 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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#ifndef pr_fmt
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# define pr_fmt(fmt) "fuse: " fmt
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#endif
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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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#include <linux/kref.h>
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#include <linux/xattr.h>
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#include <linux/pid_namespace.h>
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#include <linux/refcount.h>
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#include <linux/user_namespace.h>
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/** Default max number of pages that can be used in a single read request */
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#define FUSE_DEFAULT_MAX_PAGES_PER_REQ 32
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/** Maximum of max_pages received in init_out */
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#define FUSE_MAX_MAX_PAGES 256
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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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/** 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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/* Which attributes are invalid */
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u32 inval_mask;
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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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union {
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/* Write related fields (regular file only) */
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struct {
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/* Files usable in writepage. Protected by fi->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
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* (FUSE_NOWRITE) 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 rb_root writepages;
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};
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/* readdir cache (directory only) */
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struct {
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/* true if fully cached */
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bool cached;
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/* size of cache */
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loff_t size;
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/* position at end of cache (position of next entry) */
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loff_t pos;
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/* version of the cache */
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u64 version;
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/* modification time of directory when cache was
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* started */
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struct timespec64 mtime;
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/* iversion of directory when cache was started */
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u64 iversion;
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/* protects above fields */
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spinlock_t lock;
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} rdc;
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};
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/** Miscellaneous bits describing inode state */
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unsigned long state;
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/** Lock for serializing lookup and readdir for back compatibility*/
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struct mutex mutex;
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/** Lock to protect write related fields */
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spinlock_t lock;
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#ifdef CONFIG_FUSE_DAX
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/*
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* Dax specific inode data
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*/
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struct fuse_inode_dax *dax;
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#endif
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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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/* Bad inode */
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FUSE_I_BAD,
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};
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struct fuse_conn;
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struct fuse_mount;
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struct fuse_release_args;
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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_mount *fm;
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/* Argument space reserved for release */
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struct fuse_release_args *release_args;
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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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refcount_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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/* Readdir related */
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struct {
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/*
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* Protects below fields against (crazy) parallel readdir on
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* same open file. Uncontended in the normal case.
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*/
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struct mutex lock;
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/* Dir stream position */
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loff_t pos;
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/* Offset in cache */
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loff_t cache_off;
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/* Version of cache we are reading */
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u64 version;
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} readdir;
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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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/** 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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/** 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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uint64_t nodeid;
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uint32_t opcode;
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unsigned short in_numargs;
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unsigned short out_numargs;
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bool force:1;
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bool noreply:1;
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bool nocreds:1;
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bool in_pages:1;
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bool out_pages:1;
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bool user_pages:1;
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bool out_argvar:1;
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bool page_zeroing:1;
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bool page_replace:1;
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bool may_block:1;
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struct fuse_in_arg in_args[3];
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struct fuse_arg out_args[2];
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void (*end)(struct fuse_mount *fm, struct fuse_args *args, int error);
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};
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struct fuse_args_pages {
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struct fuse_args args;
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struct page **pages;
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struct fuse_page_desc *descs;
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unsigned int num_pages;
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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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struct kref refcnt;
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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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bool should_dirty;
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int err;
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struct kiocb *iocb;
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struct completion *done;
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bool blocking;
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};
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#define FUSE_IO_PRIV_SYNC(i) \
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{ \
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.refcnt = KREF_INIT(1), \
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.async = 0, \
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.iocb = i, \
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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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* FR_ASYNC: request is asynchronous
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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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FR_ASYNC,
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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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/* Input/output arguments */
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struct fuse_args *args;
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/** refcount */
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refcount_t count;
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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 header */
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struct {
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struct fuse_in_header h;
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} in;
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/* The request output header */
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struct {
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struct fuse_out_header h;
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} 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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#if IS_ENABLED(CONFIG_VIRTIO_FS)
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/** virtio-fs's physically contiguous buffer for in and out args */
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void *argbuf;
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#endif
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/** fuse_mount this request belongs to */
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struct fuse_mount *fm;
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};
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struct fuse_iqueue;
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/**
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* Input queue callbacks
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*
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* Input queue signalling is device-specific. For example, the /dev/fuse file
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* uses fiq->waitq and fasync to wake processes that are waiting on queue
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* readiness. These callbacks allow other device types to respond to input
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* queue activity.
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*/
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struct fuse_iqueue_ops {
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/**
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* Signal that a forget has been queued
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*/
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void (*wake_forget_and_unlock)(struct fuse_iqueue *fiq)
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__releases(fiq->lock);
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/**
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* Signal that an INTERRUPT request has been queued
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*/
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void (*wake_interrupt_and_unlock)(struct fuse_iqueue *fiq)
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__releases(fiq->lock);
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/**
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* Signal that a request has been queued
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*/
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void (*wake_pending_and_unlock)(struct fuse_iqueue *fiq)
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__releases(fiq->lock);
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/**
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* Clean up when fuse_iqueue is destroyed
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*/
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void (*release)(struct fuse_iqueue *fiq);
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};
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/** /dev/fuse input queue operations */
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extern const struct fuse_iqueue_ops fuse_dev_fiq_ops;
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struct fuse_iqueue {
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/** Connection established */
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unsigned connected;
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/** Lock protecting accesses to members of this structure */
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spinlock_t lock;
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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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/** Device-specific callbacks */
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const struct fuse_iqueue_ops *ops;
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/** Device-specific state */
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void *priv;
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};
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#define FUSE_PQ_HASH_BITS 8
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#define FUSE_PQ_HASH_SIZE (1 << FUSE_PQ_HASH_BITS)
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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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/** Hash table 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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enum fuse_dax_mode {
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FUSE_DAX_INODE_DEFAULT, /* default */
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FUSE_DAX_ALWAYS, /* "-o dax=always" */
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FUSE_DAX_NEVER, /* "-o dax=never" */
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FUSE_DAX_INODE_USER, /* "-o dax=inode" */
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};
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static inline bool fuse_is_inode_dax_mode(enum fuse_dax_mode mode)
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{
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return mode == FUSE_DAX_INODE_DEFAULT || mode == FUSE_DAX_INODE_USER;
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}
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struct fuse_fs_context {
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int fd;
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struct file *file;
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unsigned int rootmode;
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kuid_t user_id;
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kgid_t group_id;
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bool is_bdev:1;
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bool fd_present:1;
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bool rootmode_present:1;
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bool user_id_present:1;
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bool group_id_present:1;
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bool default_permissions:1;
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bool allow_other:1;
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bool destroy:1;
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bool no_control:1;
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bool no_force_umount:1;
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bool legacy_opts_show:1;
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enum fuse_dax_mode dax_mode;
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unsigned int max_read;
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unsigned int blksize;
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const char *subtype;
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/* DAX device, may be NULL */
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struct dax_device *dax_dev;
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/* fuse_dev pointer to fill in, should contain NULL on entry */
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void **fudptr;
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};
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struct fuse_sync_bucket {
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/* count is a possible scalability bottleneck */
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atomic_t count;
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wait_queue_head_t waitq;
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struct rcu_head rcu;
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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 root filesystem is mounted, and
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* is destroyed, when the client device is closed and the last
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* fuse_mount is destroyed.
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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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refcount_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 pid namespace for this mount */
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struct pid_namespace *pid_ns;
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/** The user namespace for this mount */
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struct user_namespace *user_ns;
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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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/** Maximum number of pages that can be used in a single request */
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unsigned int max_pages;
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/** Constrain ->max_pages to this value during feature negotiation */
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unsigned int max_pages_limit;
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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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atomic64_t 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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/** Protects: max_background, congestion_threshold, num_background,
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* active_background, bg_queue, blocked */
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spinlock_t bg_lock;
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|
|
/** 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;
|
|
|
|
/** Connection established, cleared on umount, connection
|
|
abort and device release */
|
|
unsigned connected;
|
|
|
|
/** Connection aborted via sysfs */
|
|
bool aborted;
|
|
|
|
/** 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 readahead asynchronously? Only set in INIT */
|
|
unsigned async_read:1;
|
|
|
|
/** Return an unique read error after abort. Only set in INIT */
|
|
unsigned abort_err: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;
|
|
|
|
/** cache READLINK responses in page cache */
|
|
unsigned cache_symlinks:1;
|
|
|
|
/* show legacy mount options */
|
|
unsigned int legacy_opts_show:1;
|
|
|
|
/*
|
|
* fs kills suid/sgid/cap on write/chown/trunc. suid is killed on
|
|
* write/trunc only if caller did not have CAP_FSETID. sgid is killed
|
|
* on write/truncate only if caller did not have CAP_FSETID as well as
|
|
* file has group execute permission.
|
|
*/
|
|
unsigned handle_killpriv_v2:1;
|
|
|
|
/*
|
|
* 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 opendir/releasedir not implemented by fs? */
|
|
unsigned no_opendir: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;
|
|
|
|
/** Does file server support extended setxattr */
|
|
unsigned setxattr_ext: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;
|
|
|
|
/** Filesystem is fully responsible for page cache invalidation. */
|
|
unsigned explicit_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;
|
|
|
|
/** Does the filesystem support copy_file_range? */
|
|
unsigned no_copy_file_range:1;
|
|
|
|
/* Send DESTROY request */
|
|
unsigned int destroy:1;
|
|
|
|
/* Delete dentries that have gone stale */
|
|
unsigned int delete_stale:1;
|
|
|
|
/** Do not create entry in fusectl fs */
|
|
unsigned int no_control:1;
|
|
|
|
/** Do not allow MNT_FORCE umount */
|
|
unsigned int no_force_umount:1;
|
|
|
|
/* Auto-mount submounts announced by the server */
|
|
unsigned int auto_submounts:1;
|
|
|
|
/* Propagate syncfs() to server */
|
|
unsigned int sync_fs:1;
|
|
|
|
/* Initialize security xattrs when creating a new inode */
|
|
unsigned int init_security:1;
|
|
|
|
/* Does the filesystem support per inode DAX? */
|
|
unsigned int inode_dax:1;
|
|
|
|
/* Is tmpfile not implemented by fs? */
|
|
unsigned int no_tmpfile:1;
|
|
|
|
/** The number of requests waiting for completion */
|
|
atomic_t num_waiting;
|
|
|
|
/** Negotiated minor version */
|
|
unsigned minor;
|
|
|
|
/** Entry on the fuse_mount_list */
|
|
struct list_head entry;
|
|
|
|
/** Device ID from the root 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];
|
|
|
|
/** Version counter for attribute changes */
|
|
atomic64_t attr_version;
|
|
|
|
/** Called on final put */
|
|
void (*release)(struct fuse_conn *);
|
|
|
|
/**
|
|
* Read/write semaphore to hold when accessing the sb of any
|
|
* fuse_mount belonging to this connection
|
|
*/
|
|
struct rw_semaphore killsb;
|
|
|
|
/** List of device instances belonging to this connection */
|
|
struct list_head devices;
|
|
|
|
#ifdef CONFIG_FUSE_DAX
|
|
/* Dax mode */
|
|
enum fuse_dax_mode dax_mode;
|
|
|
|
/* Dax specific conn data, non-NULL if DAX is enabled */
|
|
struct fuse_conn_dax *dax;
|
|
#endif
|
|
|
|
/** List of filesystems using this connection */
|
|
struct list_head mounts;
|
|
|
|
/* New writepages go into this bucket */
|
|
struct fuse_sync_bucket __rcu *curr_bucket;
|
|
};
|
|
|
|
/*
|
|
* Represents a mounted filesystem, potentially a submount.
|
|
*
|
|
* This object allows sharing a fuse_conn between separate mounts to
|
|
* allow submounts with dedicated superblocks and thus separate device
|
|
* IDs.
|
|
*/
|
|
struct fuse_mount {
|
|
/* Underlying (potentially shared) connection to the FUSE server */
|
|
struct fuse_conn *fc;
|
|
|
|
/*
|
|
* Super block for this connection (fc->killsb must be held when
|
|
* accessing this).
|
|
*/
|
|
struct super_block *sb;
|
|
|
|
/* Entry on fc->mounts */
|
|
struct list_head fc_entry;
|
|
};
|
|
|
|
static inline struct fuse_mount *get_fuse_mount_super(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
|
|
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
|
|
{
|
|
return get_fuse_mount_super(sb)->fc;
|
|
}
|
|
|
|
static inline struct fuse_mount *get_fuse_mount(struct inode *inode)
|
|
{
|
|
return get_fuse_mount_super(inode->i_sb);
|
|
}
|
|
|
|
static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
|
|
{
|
|
return get_fuse_mount_super(inode->i_sb)->fc;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline int invalid_nodeid(u64 nodeid)
|
|
{
|
|
return !nodeid || nodeid == FUSE_ROOT_ID;
|
|
}
|
|
|
|
static inline u64 fuse_get_attr_version(struct fuse_conn *fc)
|
|
{
|
|
return atomic64_read(&fc->attr_version);
|
|
}
|
|
|
|
static inline bool fuse_stale_inode(const struct inode *inode, int generation,
|
|
struct fuse_attr *attr)
|
|
{
|
|
return inode->i_generation != generation ||
|
|
inode_wrong_type(inode, attr->mode);
|
|
}
|
|
|
|
static inline void fuse_make_bad(struct inode *inode)
|
|
{
|
|
remove_inode_hash(inode);
|
|
set_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state);
|
|
}
|
|
|
|
static inline bool fuse_is_bad(struct inode *inode)
|
|
{
|
|
return unlikely(test_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state));
|
|
}
|
|
|
|
static inline struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
|
|
struct fuse_page_desc **desc)
|
|
{
|
|
struct page **pages;
|
|
|
|
pages = kzalloc(npages * (sizeof(struct page *) +
|
|
sizeof(struct fuse_page_desc)), flags);
|
|
*desc = (void *) (pages + npages);
|
|
|
|
return pages;
|
|
}
|
|
|
|
static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs,
|
|
unsigned int index,
|
|
unsigned int nr_pages)
|
|
{
|
|
int i;
|
|
|
|
for (i = index; i < index + nr_pages; i++)
|
|
descs[i].length = PAGE_SIZE - descs[i].offset;
|
|
}
|
|
|
|
static inline void fuse_sync_bucket_dec(struct fuse_sync_bucket *bucket)
|
|
{
|
|
/* Need RCU protection to prevent use after free after the decrement */
|
|
rcu_read_lock();
|
|
if (atomic_dec_and_test(&bucket->count))
|
|
wake_up(&bucket->waitq);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/** 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;
|
|
|
|
/**
|
|
* 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);
|
|
|
|
struct fuse_forget_link *fuse_dequeue_forget(struct fuse_iqueue *fiq,
|
|
unsigned int max,
|
|
unsigned int *countp);
|
|
|
|
/*
|
|
* Initialize READ or READDIR request
|
|
*/
|
|
struct fuse_io_args {
|
|
union {
|
|
struct {
|
|
struct fuse_read_in in;
|
|
u64 attr_ver;
|
|
} read;
|
|
struct {
|
|
struct fuse_write_in in;
|
|
struct fuse_write_out out;
|
|
bool page_locked;
|
|
} write;
|
|
};
|
|
struct fuse_args_pages ap;
|
|
struct fuse_io_priv *io;
|
|
struct fuse_file *ff;
|
|
};
|
|
|
|
void fuse_read_args_fill(struct fuse_io_args *ia, 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_mount *fm);
|
|
void fuse_file_free(struct fuse_file *ff);
|
|
void fuse_finish_open(struct inode *inode, struct file *file);
|
|
|
|
void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff,
|
|
unsigned int flags);
|
|
|
|
/**
|
|
* Send RELEASE or RELEASEDIR request
|
|
*/
|
|
void fuse_release_common(struct file *file, bool isdir);
|
|
|
|
/**
|
|
* Send FSYNC or FSYNCDIR request
|
|
*/
|
|
int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
|
|
int datasync, int opcode);
|
|
|
|
/**
|
|
* 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, unsigned int flags);
|
|
|
|
/**
|
|
* 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, u32 cache_mask);
|
|
|
|
u32 fuse_get_cache_mask(struct inode *inode);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* Simple request sending that does request allocation and freeing
|
|
*/
|
|
ssize_t fuse_simple_request(struct fuse_mount *fm, struct fuse_args *args);
|
|
int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
|
|
gfp_t gfp_flags);
|
|
|
|
/**
|
|
* End a finished request
|
|
*/
|
|
void fuse_request_end(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
|
|
*/
|
|
|
|
/* Attributes possibly changed on data modification */
|
|
#define FUSE_STATX_MODIFY (STATX_MTIME | STATX_CTIME | STATX_BLOCKS)
|
|
|
|
/* Attributes possibly changed on data and/or size modification */
|
|
#define FUSE_STATX_MODSIZE (FUSE_STATX_MODIFY | STATX_SIZE)
|
|
|
|
void fuse_invalidate_attr(struct inode *inode);
|
|
void fuse_invalidate_attr_mask(struct inode *inode, u32 mask);
|
|
|
|
void fuse_invalidate_entry_cache(struct dentry *entry);
|
|
|
|
void fuse_invalidate_atime(struct inode *inode);
|
|
|
|
u64 entry_attr_timeout(struct fuse_entry_out *o);
|
|
void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o);
|
|
|
|
/**
|
|
* 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, struct fuse_mount *fm,
|
|
struct user_namespace *user_ns,
|
|
const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv);
|
|
|
|
/**
|
|
* Release reference to fuse_conn
|
|
*/
|
|
void fuse_conn_put(struct fuse_conn *fc);
|
|
|
|
struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc);
|
|
struct fuse_dev *fuse_dev_alloc(void);
|
|
void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc);
|
|
void fuse_dev_free(struct fuse_dev *fud);
|
|
void fuse_send_init(struct fuse_mount *fm);
|
|
|
|
/**
|
|
* Fill in superblock and initialize fuse connection
|
|
* @sb: partially-initialized superblock to fill in
|
|
* @ctx: mount context
|
|
*/
|
|
int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx);
|
|
|
|
/*
|
|
* Remove the mount from the connection
|
|
*
|
|
* Returns whether this was the last mount
|
|
*/
|
|
bool fuse_mount_remove(struct fuse_mount *fm);
|
|
|
|
/*
|
|
* Setup context ops for submounts
|
|
*/
|
|
int fuse_init_fs_context_submount(struct fs_context *fsc);
|
|
|
|
/*
|
|
* Shut down the connection (possibly sending DESTROY request).
|
|
*/
|
|
void fuse_conn_destroy(struct fuse_mount *fm);
|
|
|
|
/* Drop the connection and free the fuse mount */
|
|
void fuse_mount_destroy(struct fuse_mount *fm);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
bool fuse_invalid_attr(struct fuse_attr *attr);
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/**
|
|
* Is current process allowed to perform filesystem operation?
|
|
*/
|
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bool fuse_allow_current_process(struct fuse_conn *fc);
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u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
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|
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void fuse_flush_time_update(struct inode *inode);
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void fuse_update_ctime(struct inode *inode);
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int fuse_update_attributes(struct inode *inode, struct file *file, u32 mask);
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|
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void fuse_flush_writepages(struct inode *inode);
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|
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void fuse_set_nowrite(struct inode *inode);
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void fuse_release_nowrite(struct inode *inode);
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|
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/**
|
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* Scan all fuse_mounts belonging to fc to find the first where
|
|
* ilookup5() returns a result. Return that result and the
|
|
* respective fuse_mount in *fm (unless fm is NULL).
|
|
*
|
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* The caller must hold fc->killsb.
|
|
*/
|
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struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid,
|
|
struct fuse_mount **fm);
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|
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/**
|
|
* File-system tells the kernel to invalidate cache for the given node id.
|
|
*/
|
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int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
|
|
loff_t offset, loff_t len);
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|
|
|
/**
|
|
* 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 fuse_conn *fc, u64 parent_nodeid,
|
|
u64 child_nodeid, struct qstr *name, u32 flags);
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|
|
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int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
|
|
bool isdir);
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|
|
|
/**
|
|
* 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);
|
|
__poll_t fuse_file_poll(struct file *file, poll_table *wait);
|
|
int fuse_dev_release(struct inode *inode, struct file *file);
|
|
|
|
bool fuse_write_update_attr(struct inode *inode, loff_t pos, ssize_t written);
|
|
|
|
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, unsigned int extra_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[];
|
|
|
|
struct posix_acl;
|
|
struct posix_acl *fuse_get_inode_acl(struct inode *inode, int type, bool rcu);
|
|
struct posix_acl *fuse_get_acl(struct user_namespace *mnt_userns,
|
|
struct dentry *dentry, int type);
|
|
int fuse_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
|
|
struct posix_acl *acl, int type);
|
|
|
|
/* readdir.c */
|
|
int fuse_readdir(struct file *file, struct dir_context *ctx);
|
|
|
|
/**
|
|
* Return the number of bytes in an arguments list
|
|
*/
|
|
unsigned int fuse_len_args(unsigned int numargs, struct fuse_arg *args);
|
|
|
|
/**
|
|
* Get the next unique ID for a request
|
|
*/
|
|
u64 fuse_get_unique(struct fuse_iqueue *fiq);
|
|
void fuse_free_conn(struct fuse_conn *fc);
|
|
|
|
/* dax.c */
|
|
|
|
#define FUSE_IS_DAX(inode) (IS_ENABLED(CONFIG_FUSE_DAX) && IS_DAX(inode))
|
|
|
|
ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to);
|
|
ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from);
|
|
int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma);
|
|
int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start, u64 dmap_end);
|
|
int fuse_dax_conn_alloc(struct fuse_conn *fc, enum fuse_dax_mode mode,
|
|
struct dax_device *dax_dev);
|
|
void fuse_dax_conn_free(struct fuse_conn *fc);
|
|
bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi);
|
|
void fuse_dax_inode_init(struct inode *inode, unsigned int flags);
|
|
void fuse_dax_inode_cleanup(struct inode *inode);
|
|
void fuse_dax_dontcache(struct inode *inode, unsigned int flags);
|
|
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
|
|
void fuse_dax_cancel_work(struct fuse_conn *fc);
|
|
|
|
/* ioctl.c */
|
|
long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
|
|
long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg);
|
|
int fuse_fileattr_get(struct dentry *dentry, struct fileattr *fa);
|
|
int fuse_fileattr_set(struct user_namespace *mnt_userns,
|
|
struct dentry *dentry, struct fileattr *fa);
|
|
|
|
/* file.c */
|
|
|
|
struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid,
|
|
unsigned int open_flags, bool isdir);
|
|
void fuse_file_release(struct inode *inode, struct fuse_file *ff,
|
|
unsigned int open_flags, fl_owner_t id, bool isdir);
|
|
|
|
#endif /* _FS_FUSE_I_H */
|