[mirror_ubuntu-bionic-kernel.git] / include / linux / nfs_fs.h

/*
 *  linux/include/linux/nfs_fs.h
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  OS-specific nfs filesystem definitions and declarations
 */

#ifndef _LINUX_NFS_FS_H
#define _LINUX_NFS_FS_H

#include <linux/config.h>
#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rwsem.h>
#include <linux/wait.h>

#include <linux/nfs_fs_sb.h>

#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>

#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
#include <linux/nfs_xdr.h>
#include <linux/rwsem.h>
#include <linux/mempool.h>

/*
 * Enable debugging support for nfs client.
 * Requires RPC_DEBUG.
 */
#ifdef RPC_DEBUG
# define NFS_DEBUG
#endif

#define NFS_MAX_FILE_IO_BUFFER_SIZE	32768
#define NFS_DEF_FILE_IO_BUFFER_SIZE	4096

/*
 * superblock magic number for NFS
 */
#define NFS_SUPER_MAGIC			0x6969

/*
 * These are the default flags for swap requests
 */
#define NFS_RPC_SWAPFLAGS		(RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)

/*
 * When flushing a cluster of dirty pages, there can be different
 * strategies:
 */
#define FLUSH_AGING		0	/* only flush old buffers */
#define FLUSH_SYNC		1	/* file being synced, or contention */
#define FLUSH_WAIT		2	/* wait for completion */
#define FLUSH_STABLE		4	/* commit to stable storage */
#define FLUSH_LOWPRI		8	/* low priority background flush */
#define FLUSH_HIGHPRI		16	/* high priority memory reclaim flush */

#ifdef __KERNEL__

/*
 * NFSv3/v4 Access mode cache entry
 */
struct nfs_access_entry {
	unsigned long		jiffies;
	struct rpc_cred *	cred;
	int			mask;
};

struct nfs4_state;
struct nfs_open_context {
	atomic_t count;
	struct dentry *dentry;
	struct rpc_cred *cred;
	struct nfs4_state *state;
	fl_owner_t lockowner;
	int mode;
	int error;

	struct list_head list;

	__u64 dir_cookie;
};

/*
 * NFSv4 delegation
 */
struct nfs_delegation;

struct posix_acl;

/*
 * nfs fs inode data in memory
 */
struct nfs_inode {
	/*
	 * The 64bit 'inode number'
	 */
	__u64 fileid;

	/*
	 * NFS file handle
	 */
	struct nfs_fh		fh;

	/*
	 * Various flags
	 */
	unsigned int		flags;

	/*
	 * read_cache_jiffies is when we started read-caching this inode,
	 * and read_cache_mtime is the mtime of the inode at that time.
	 * attrtimeo is for how long the cached information is assumed
	 * to be valid. A successful attribute revalidation doubles
	 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
	 * acregmin/acdirmin.
	 *
	 * We need to revalidate the cached attrs for this inode if
	 *
	 *	jiffies - read_cache_jiffies > attrtimeo
	 *
	 * and invalidate any cached data/flush out any dirty pages if
	 * we find that
	 *
	 *	mtime != read_cache_mtime
	 */
	unsigned long		read_cache_jiffies;
	unsigned long		attrtimeo;
	unsigned long		attrtimeo_timestamp;
	__u64			change_attr;		/* v4 only */

	/* "Generation counter" for the attribute cache. This is
	 * bumped whenever we update the metadata on the
	 * server.
	 */
	unsigned long		cache_change_attribute;
	/*
	 * Counter indicating the number of outstanding requests that
	 * will cause a file data update.
	 */
	atomic_t		data_updates;

	struct nfs_access_entry	cache_access;
#ifdef CONFIG_NFS_V3_ACL
	struct posix_acl	*acl_access;
	struct posix_acl	*acl_default;
#endif

	/*
	 * This is the cookie verifier used for NFSv3 readdir
	 * operations
	 */
	__u32			cookieverf[2];

	/*
	 * This is the list of dirty unwritten pages.
	 */
	spinlock_t		req_lock;
	struct list_head	dirty;
	struct list_head	commit;
	struct radix_tree_root	nfs_page_tree;

	unsigned int		ndirty,
				ncommit,
				npages;

	/* Open contexts for shared mmap writes */
	struct list_head	open_files;

	wait_queue_head_t	nfs_i_wait;

#ifdef CONFIG_NFS_V4
	struct nfs4_cached_acl	*nfs4_acl;
        /* NFSv4 state */
	struct list_head	open_states;
	struct nfs_delegation	*delegation;
	int			 delegation_state;
	struct rw_semaphore	rwsem;
#endif /* CONFIG_NFS_V4*/
	struct inode		vfs_inode;
};

/*
 * Legal inode flag values
 */
#define NFS_INO_STALE		0x0001		/* possible stale inode */
#define NFS_INO_ADVISE_RDPLUS   0x0002          /* advise readdirplus */
#define NFS_INO_REVALIDATING	0x0004		/* revalidating attrs */
#define NFS_INO_INVALID_ATTR	0x0008		/* cached attrs are invalid */
#define NFS_INO_INVALID_DATA	0x0010		/* cached data is invalid */
#define NFS_INO_INVALID_ATIME	0x0020		/* cached atime is invalid */
#define NFS_INO_INVALID_ACCESS	0x0040		/* cached access cred invalid */
#define NFS_INO_INVALID_ACL	0x0080		/* cached acls are invalid */

static inline struct nfs_inode *NFS_I(struct inode *inode)
{
	return container_of(inode, struct nfs_inode, vfs_inode);
}
#define NFS_SB(s)		((struct nfs_server *)(s->s_fs_info))

#define NFS_FH(inode)			(&NFS_I(inode)->fh)
#define NFS_SERVER(inode)		(NFS_SB(inode->i_sb))
#define NFS_CLIENT(inode)		(NFS_SERVER(inode)->client)
#define NFS_PROTO(inode)		(NFS_SERVER(inode)->rpc_ops)
#define NFS_ADDR(inode)			(RPC_PEERADDR(NFS_CLIENT(inode)))
#define NFS_COOKIEVERF(inode)		(NFS_I(inode)->cookieverf)
#define NFS_READTIME(inode)		(NFS_I(inode)->read_cache_jiffies)
#define NFS_CHANGE_ATTR(inode)		(NFS_I(inode)->change_attr)
#define NFS_ATTRTIMEO(inode)		(NFS_I(inode)->attrtimeo)
#define NFS_MINATTRTIMEO(inode) \
	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
			       : NFS_SERVER(inode)->acregmin)
#define NFS_MAXATTRTIMEO(inode) \
	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
			       : NFS_SERVER(inode)->acregmax)
#define NFS_ATTRTIMEO_UPDATE(inode)	(NFS_I(inode)->attrtimeo_timestamp)

#define NFS_FLAGS(inode)		(NFS_I(inode)->flags)
#define NFS_REVALIDATING(inode)		(NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
#define NFS_STALE(inode)		(NFS_FLAGS(inode) & NFS_INO_STALE)

#define NFS_FILEID(inode)		(NFS_I(inode)->fileid)

static inline int nfs_caches_unstable(struct inode *inode)
{
	return atomic_read(&NFS_I(inode)->data_updates) != 0;
}

static inline void NFS_CACHEINV(struct inode *inode)
{
	if (!nfs_caches_unstable(inode))
		NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
}

static inline int nfs_server_capable(struct inode *inode, int cap)
{
	return NFS_SERVER(inode)->caps & cap;
}

static inline int NFS_USE_READDIRPLUS(struct inode *inode)
{
	return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
}

/**
 * nfs_save_change_attribute - Returns the inode attribute change cookie
 * @inode - pointer to inode
 * The "change attribute" is updated every time we finish an operation
 * that will result in a metadata change on the server.
 */
static inline long nfs_save_change_attribute(struct inode *inode)
{
	return NFS_I(inode)->cache_change_attribute;
}

/**
 * nfs_verify_change_attribute - Detects NFS inode cache updates
 * @inode - pointer to inode
 * @chattr - previously saved change attribute
 * Return "false" if metadata has been updated (or is in the process of
 * being updated) since the change attribute was saved.
 */
static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
{
	return !nfs_caches_unstable(inode)
		&& chattr == NFS_I(inode)->cache_change_attribute;
}

/*
 * linux/fs/nfs/inode.c
 */
extern void nfs_zap_caches(struct inode *);
extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
				struct nfs_fattr *);
extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int nfs_permission(struct inode *, int, struct nameidata *);
extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_release(struct inode *, struct file *);
extern int nfs_attribute_timeout(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);
extern void nfs_end_data_update(struct inode *);
extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
extern void nfs_file_clear_open_context(struct file *filp);

/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern u32 root_nfs_parse_addr(char *name); /*__init*/

/*
 * linux/fs/nfs/file.c
 */
extern struct inode_operations nfs_file_inode_operations;
#ifdef CONFIG_NFS_V3
extern struct inode_operations nfs3_file_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern struct file_operations nfs_file_operations;
extern struct address_space_operations nfs_file_aops;

static inline struct rpc_cred *nfs_file_cred(struct file *file)
{
	if (file != NULL) {
		struct nfs_open_context *ctx;

		ctx = (struct nfs_open_context*)file->private_data;
		return ctx->cred;
	}
	return NULL;
}

/*
 * linux/fs/nfs/xattr.c
 */
#ifdef CONFIG_NFS_V3_ACL
extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
extern int nfs3_setxattr(struct dentry *, const char *,
			const void *, size_t, int);
extern int nfs3_removexattr (struct dentry *, const char *name);
#else
# define nfs3_listxattr NULL
# define nfs3_getxattr NULL
# define nfs3_setxattr NULL
# define nfs3_removexattr NULL
#endif

/*
 * linux/fs/nfs/direct.c
 */
extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
			unsigned long);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
			size_t count, loff_t pos);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
			size_t count, loff_t pos);

/*
 * linux/fs/nfs/dir.c
 */
extern struct inode_operations nfs_dir_inode_operations;
#ifdef CONFIG_NFS_V3
extern struct inode_operations nfs3_dir_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern struct file_operations nfs_dir_operations;
extern struct dentry_operations nfs_dentry_operations;

extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);

/*
 * linux/fs/nfs/symlink.c
 */
extern struct inode_operations nfs_symlink_inode_operations;

/*
 * linux/fs/nfs/unlink.c
 */
extern int  nfs_async_unlink(struct dentry *);
extern void nfs_complete_unlink(struct dentry *);

/*
 * linux/fs/nfs/write.c
 */
extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
extern int  nfs_writepages(struct address_space *, struct writeback_control *);
extern int  nfs_flush_incompatible(struct file *file, struct page *page);
extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
extern void nfs_writeback_done(struct rpc_task *task);

#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern void nfs_commit_done(struct rpc_task *);
#endif

/*
 * Try to write back everything synchronously (but check the
 * return value!)
 */
extern int  nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int  nfs_commit_inode(struct inode *, unsigned long, unsigned int, int);
#else
static inline int
nfs_commit_inode(struct inode *inode, unsigned long idx_start, unsigned int npages, int how)
{
	return 0;
}
#endif

static inline int
nfs_have_writebacks(struct inode *inode)
{
	return NFS_I(inode)->npages != 0;
}

static inline int
nfs_wb_all(struct inode *inode)
{
	int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
	return (error < 0) ? error : 0;
}

/*
 * Write back all requests on one page - we do this before reading it.
 */
static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
{
	int error = nfs_sync_inode(inode, page->index, 1,
			how | FLUSH_WAIT | FLUSH_STABLE);
	return (error < 0) ? error : 0;
}

static inline int nfs_wb_page(struct inode *inode, struct page* page)
{
	return nfs_wb_page_priority(inode, page, 0);
}

/*
 * Allocate and free nfs_write_data structures
 */
extern mempool_t *nfs_wdata_mempool;

static inline struct nfs_write_data *nfs_writedata_alloc(void)
{
	struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
	if (p) {
		memset(p, 0, sizeof(*p));
		INIT_LIST_HEAD(&p->pages);
	}
	return p;
}

static inline void nfs_writedata_free(struct nfs_write_data *p)
{
	mempool_free(p, nfs_wdata_mempool);
}

/*
 * linux/fs/nfs/read.c
 */
extern int  nfs_readpage(struct file *, struct page *);
extern int  nfs_readpages(struct file *, struct address_space *,
		struct list_head *, unsigned);
extern void nfs_readpage_result(struct rpc_task *);

/*
 * Allocate and free nfs_read_data structures
 */
extern mempool_t *nfs_rdata_mempool;

static inline struct nfs_read_data *nfs_readdata_alloc(void)
{
	struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
	if (p)
		memset(p, 0, sizeof(*p));
	return p;
}

static inline void nfs_readdata_free(struct nfs_read_data *p)
{
	mempool_free(p, nfs_rdata_mempool);
}

extern void  nfs_readdata_release(struct rpc_task *task);

/*
 * linux/fs/nfs3proc.c
 */
#ifdef CONFIG_NFS_V3_ACL
extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
extern int nfs3_proc_setacl(struct inode *inode, int type,
			    struct posix_acl *acl);
extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
		mode_t mode);
extern void nfs3_forget_cached_acls(struct inode *inode);
#else
static inline int nfs3_proc_set_default_acl(struct inode *dir,
					    struct inode *inode,
					    mode_t mode)
{
	return 0;
}

static inline void nfs3_forget_cached_acls(struct inode *inode)
{
}
#endif /* CONFIG_NFS_V3_ACL */

/*
 * linux/fs/mount_clnt.c
 * (Used only by nfsroot module)
 */
extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
		int, int);

/*
 * inline functions
 */

static inline loff_t
nfs_size_to_loff_t(__u64 size)
{
	loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
	if (size > maxsz)
		return maxsz;
	return (loff_t) size;
}

static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)
{
	ino_t ino = (ino_t) fileid;
	if (sizeof(ino_t) < sizeof(u64))
		ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	return ino;
}

/* NFS root */

extern void * nfs_root_data(void);

#define nfs_wait_event(clnt, wq, condition)				\
({									\
	int __retval = 0;						\
	if (clnt->cl_intr) {						\
		sigset_t oldmask;					\
		rpc_clnt_sigmask(clnt, &oldmask);			\
		__retval = wait_event_interruptible(wq, condition);	\
		rpc_clnt_sigunmask(clnt, &oldmask);			\
	} else								\
		wait_event(wq, condition);				\
	__retval;							\
})

#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)

#endif /* __KERNEL__ */

/*
 * NFS debug flags
 */
#define NFSDBG_VFS		0x0001
#define NFSDBG_DIRCACHE		0x0002
#define NFSDBG_LOOKUPCACHE	0x0004
#define NFSDBG_PAGECACHE	0x0008
#define NFSDBG_PROC		0x0010
#define NFSDBG_XDR		0x0020
#define NFSDBG_FILE		0x0040
#define NFSDBG_ROOT		0x0080
#define NFSDBG_CALLBACK		0x0100
#define NFSDBG_ALL		0xFFFF

#ifdef __KERNEL__
# undef ifdebug
# ifdef NFS_DEBUG
#  define ifdebug(fac)		if (unlikely(nfs_debug & NFSDBG_##fac))
# else
#  define ifdebug(fac)		if (0)
# endif
#endif /* __KERNEL */

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/linux/nfs_fs.h
	3	*
	4	* Copyright (C) 1992 Rick Sladkey
	5	*
	6	* OS-specific nfs filesystem definitions and declarations
	7	*/
	8
	9	#ifndef _LINUX_NFS_FS_H
	10	#define _LINUX_NFS_FS_H
	11
	12	#include <linux/config.h>
	13	#include <linux/in.h>
	14	#include <linux/mm.h>
	15	#include <linux/pagemap.h>
	16	#include <linux/rwsem.h>
	17	#include <linux/wait.h>
1da177e4 LT	18
	19	#include <linux/nfs_fs_sb.h>
	20
	21	#include <linux/sunrpc/debug.h>
	22	#include <linux/sunrpc/auth.h>
	23	#include <linux/sunrpc/clnt.h>
	24
	25	#include <linux/nfs.h>
	26	#include <linux/nfs2.h>
	27	#include <linux/nfs3.h>
	28	#include <linux/nfs4.h>
	29	#include <linux/nfs_xdr.h>
	30	#include <linux/rwsem.h>
1da177e4 LT	31	#include <linux/mempool.h>
	32
	33	/*
	34	* Enable debugging support for nfs client.
	35	* Requires RPC_DEBUG.
	36	*/
	37	#ifdef RPC_DEBUG
	38	# define NFS_DEBUG
	39	#endif
	40
	41	#define NFS_MAX_FILE_IO_BUFFER_SIZE 32768
	42	#define NFS_DEF_FILE_IO_BUFFER_SIZE 4096
	43
1da177e4 LT	44	/*
	45	* superblock magic number for NFS
	46	*/
	47	#define NFS_SUPER_MAGIC 0x6969
	48
	49	/*
	50	* These are the default flags for swap requests
	51	*/
	52	#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER\|RPC_TASK_ROOTCREDS)
	53
1da177e4 LT	54	/*
	55	* When flushing a cluster of dirty pages, there can be different
	56	* strategies:
	57	*/
	58	#define FLUSH_AGING 0 /* only flush old buffers */
	59	#define FLUSH_SYNC 1 /* file being synced, or contention */
	60	#define FLUSH_WAIT 2 /* wait for completion */
	61	#define FLUSH_STABLE 4 /* commit to stable storage */
	62	#define FLUSH_LOWPRI 8 /* low priority background flush */
	63	#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
	64
	65	#ifdef __KERNEL__
	66
	67	/*
	68	* NFSv3/v4 Access mode cache entry
	69	*/
	70	struct nfs_access_entry {
	71	unsigned long jiffies;
	72	struct rpc_cred * cred;
	73	int mask;
	74	};
	75
	76	struct nfs4_state;
	77	struct nfs_open_context {
	78	atomic_t count;
	79	struct dentry *dentry;
	80	struct rpc_cred *cred;
	81	struct nfs4_state *state;
	82	fl_owner_t lockowner;
	83	int mode;
	84	int error;
	85
	86	struct list_head list;
00a92642	87
00a92642	88	__u64 dir_cookie;
1da177e4 LT	89	};
	90
	91	/*
	92	* NFSv4 delegation
	93	*/
	94	struct nfs_delegation;
	95
5c6a9f7d AG	96	struct posix_acl;
5c6a9f7d AG	97
1da177e4 LT	98	/*
	99	* nfs fs inode data in memory
	100	*/
	101	struct nfs_inode {
	102	/*
	103	* The 64bit 'inode number'
	104	*/
	105	__u64 fileid;
	106
	107	/*
	108	* NFS file handle
	109	*/
	110	struct nfs_fh fh;
	111
	112	/*
	113	* Various flags
	114	*/
	115	unsigned int flags;
	116
	117	/*
	118	* read_cache_jiffies is when we started read-caching this inode,
	119	* and read_cache_mtime is the mtime of the inode at that time.
	120	* attrtimeo is for how long the cached information is assumed
	121	* to be valid. A successful attribute revalidation doubles
	122	* attrtimeo (up to acregmax/acdirmax), a failure resets it to
	123	* acregmin/acdirmin.
	124	*
	125	* We need to revalidate the cached attrs for this inode if
	126	*
	127	* jiffies - read_cache_jiffies > attrtimeo
	128	*
	129	* and invalidate any cached data/flush out any dirty pages if
	130	* we find that
	131	*
	132	* mtime != read_cache_mtime
	133	*/
1da177e4 LT	134	unsigned long read_cache_jiffies;
	135	unsigned long attrtimeo;
	136	unsigned long attrtimeo_timestamp;
	137	__u64 change_attr; /* v4 only */
	138
	139	/* "Generation counter" for the attribute cache. This is
	140	* bumped whenever we update the metadata on the
	141	* server.
	142	*/
	143	unsigned long cache_change_attribute;
	144	/*
	145	* Counter indicating the number of outstanding requests that
	146	* will cause a file data update.
	147	*/
	148	atomic_t data_updates;
	149
	150	struct nfs_access_entry cache_access;
5c6a9f7d AG	151	#ifdef CONFIG_NFS_V3_ACL
	152	struct posix_acl *acl_access;
	153	struct posix_acl *acl_default;
	154	#endif
1da177e4 LT	155
	156	/*
	157	* This is the cookie verifier used for NFSv3 readdir
	158	* operations
	159	*/
	160	__u32 cookieverf[2];
	161
	162	/*
	163	* This is the list of dirty unwritten pages.
	164	*/
	165	spinlock_t req_lock;
	166	struct list_head dirty;
	167	struct list_head commit;
	168	struct radix_tree_root nfs_page_tree;
	169
	170	unsigned int ndirty,
	171	ncommit,
	172	npages;
	173
	174	/* Open contexts for shared mmap writes */
	175	struct list_head open_files;
	176
	177	wait_queue_head_t nfs_i_wait;
	178
	179	#ifdef CONFIG_NFS_V4
e50a1c2e	180	struct nfs4_cached_acl *nfs4_acl;
1da177e4 LT	181	/* NFSv4 state */
	182	struct list_head open_states;
	183	struct nfs_delegation *delegation;
	184	int delegation_state;
	185	struct rw_semaphore rwsem;
	186	#endif /* CONFIG_NFS_V4*/
1da177e4 LT	187	struct inode vfs_inode;
	188	};
	189
	190	/*
	191	* Legal inode flag values
	192	*/
	193	#define NFS_INO_STALE 0x0001 /* possible stale inode */
	194	#define NFS_INO_ADVISE_RDPLUS 0x0002 /* advise readdirplus */
	195	#define NFS_INO_REVALIDATING 0x0004 /* revalidating attrs */
	196	#define NFS_INO_INVALID_ATTR 0x0008 /* cached attrs are invalid */
	197	#define NFS_INO_INVALID_DATA 0x0010 /* cached data is invalid */
	198	#define NFS_INO_INVALID_ATIME 0x0020 /* cached atime is invalid */
	199	#define NFS_INO_INVALID_ACCESS 0x0040 /* cached access cred invalid */
ada70d94	200	#define NFS_INO_INVALID_ACL 0x0080 /* cached acls are invalid */
1da177e4 LT	201
	202	static inline struct nfs_inode NFS_I(struct inode inode)
	203	{
	204	return container_of(inode, struct nfs_inode, vfs_inode);
	205	}
	206	#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
	207
	208	#define NFS_FH(inode) (&NFS_I(inode)->fh)
	209	#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
	210	#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
	211	#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
	212	#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
	213	#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
	214	#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
	215	#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
	216	#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
	217	#define NFS_MINATTRTIMEO(inode) \
	218	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
	219	: NFS_SERVER(inode)->acregmin)
	220	#define NFS_MAXATTRTIMEO(inode) \
	221	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
	222	: NFS_SERVER(inode)->acregmax)
	223	#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
	224
	225	#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
	226	#define NFS_REVALIDATING(inode) (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
	227	#define NFS_STALE(inode) (NFS_FLAGS(inode) & NFS_INO_STALE)
	228
	229	#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
	230
	231	static inline int nfs_caches_unstable(struct inode *inode)
	232	{
	233	return atomic_read(&NFS_I(inode)->data_updates) != 0;
	234	}
	235
	236	static inline void NFS_CACHEINV(struct inode *inode)
	237	{
	238	if (!nfs_caches_unstable(inode))
	239	NFS_FLAGS(inode) \|= NFS_INO_INVALID_ATTR \| NFS_INO_INVALID_ACCESS;
	240	}
	241
	242	static inline int nfs_server_capable(struct inode *inode, int cap)
	243	{
	244	return NFS_SERVER(inode)->caps & cap;
	245	}
	246
	247	static inline int NFS_USE_READDIRPLUS(struct inode *inode)
	248	{
	249	return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
	250	}
	251
	252	/**
	253	* nfs_save_change_attribute - Returns the inode attribute change cookie
	254	* @inode - pointer to inode
	255	* The "change attribute" is updated every time we finish an operation
	256	* that will result in a metadata change on the server.
	257	*/
	258	static inline long nfs_save_change_attribute(struct inode *inode)
	259	{
	260	return NFS_I(inode)->cache_change_attribute;
	261	}
	262
	263	/**
	264	* nfs_verify_change_attribute - Detects NFS inode cache updates
265	* @inode - pointer to inode
266	* @chattr - previously saved change attribute
267	* Return "false" if metadata has been updated (or is in the process of
268	* being updated) since the change attribute was saved.
269	*/
270	static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
271	{
272	return !nfs_caches_unstable(inode)
273	&& chattr == NFS_I(inode)->cache_change_attribute;
274	}
275
276	/*
277	* linux/fs/nfs/inode.c
278	*/
279	extern void nfs_zap_caches(struct inode *);
280	extern struct inode nfs_fhget(struct super_block , struct nfs_fh *,
281	struct nfs_fattr *);
282	extern int nfs_refresh_inode(struct inode , struct nfs_fattr );
283	extern int nfs_getattr(struct vfsmount , struct dentry , struct kstat *);
284	extern int nfs_permission(struct inode , int, struct nameidata );
285	extern int nfs_access_get_cached(struct inode , struct rpc_cred , struct nfs_access_entry *);
286	extern void nfs_access_add_cache(struct inode , struct nfs_access_entry );
287	extern int nfs_open(struct inode , struct file );
288	extern int nfs_release(struct inode , struct file );
289	extern int nfs_attribute_timeout(struct inode *inode);
290	extern int nfs_revalidate_inode(struct nfs_server server, struct inode inode);
291	extern int __nfs_revalidate_inode(struct nfs_server , struct inode );
7d52e862	292	extern void nfs_revalidate_mapping(struct inode inode, struct address_space mapping);
1da177e4 LT	293	extern int nfs_setattr(struct dentry , struct iattr );
	294	extern void nfs_begin_attr_update(struct inode *);
	295	extern void nfs_end_attr_update(struct inode *);
	296	extern void nfs_begin_data_update(struct inode *);
	297	extern void nfs_end_data_update(struct inode *);
1da177e4 LT	298	extern struct nfs_open_context alloc_nfs_open_context(struct dentry dentry, struct rpc_cred *cred);
	299	extern struct nfs_open_context get_nfs_open_context(struct nfs_open_context ctx);
	300	extern void put_nfs_open_context(struct nfs_open_context *ctx);
	301	extern void nfs_file_set_open_context(struct file filp, struct nfs_open_context ctx);
	302	extern struct nfs_open_context nfs_find_open_context(struct inode inode, int mode);
	303	extern void nfs_file_clear_open_context(struct file *filp);
	304
	305	/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
	306	extern u32 root_nfs_parse_addr(char name); /__init*/
	307
	308	/*
	309	* linux/fs/nfs/file.c
	310	*/
	311	extern struct inode_operations nfs_file_inode_operations;
b7fa0554 AG	312	#ifdef CONFIG_NFS_V3
	313	extern struct inode_operations nfs3_file_inode_operations;
	314	#endif /* CONFIG_NFS_V3 */
1da177e4 LT	315	extern struct file_operations nfs_file_operations;
	316	extern struct address_space_operations nfs_file_aops;
	317
	318	static inline struct rpc_cred nfs_file_cred(struct file file)
	319	{
	320	if (file != NULL) {
	321	struct nfs_open_context *ctx;
	322
	323	ctx = (struct nfs_open_context*)file->private_data;
	324	return ctx->cred;
	325	}
	326	return NULL;
	327	}
	328
b7fa0554 AG	329	/*
	330	* linux/fs/nfs/xattr.c
	331	*/
	332	#ifdef CONFIG_NFS_V3_ACL
	333	extern ssize_t nfs3_listxattr(struct dentry , char , size_t);
	334	extern ssize_t nfs3_getxattr(struct dentry , const char , void *, size_t);
	335	extern int nfs3_setxattr(struct dentry , const char ,
	336	const void *, size_t, int);
	337	extern int nfs3_removexattr (struct dentry , const char name);
	338	#else
	339	# define nfs3_listxattr NULL
	340	# define nfs3_getxattr NULL
	341	# define nfs3_setxattr NULL
	342	# define nfs3_removexattr NULL
	343	#endif
	344
1da177e4 LT	345	/*
	346	* linux/fs/nfs/direct.c
	347	*/
	348	extern ssize_t nfs_direct_IO(int, struct kiocb , const struct iovec , loff_t,
	349	unsigned long);
	350	extern ssize_t nfs_file_direct_read(struct kiocb iocb, char __user buf,
	351	size_t count, loff_t pos);
	352	extern ssize_t nfs_file_direct_write(struct kiocb iocb, const char __user buf,
	353	size_t count, loff_t pos);
	354
	355	/*
	356	* linux/fs/nfs/dir.c
	357	*/
	358	extern struct inode_operations nfs_dir_inode_operations;
b7fa0554 AG	359	#ifdef CONFIG_NFS_V3
	360	extern struct inode_operations nfs3_dir_inode_operations;
	361	#endif /* CONFIG_NFS_V3 */
1da177e4 LT	362	extern struct file_operations nfs_dir_operations;
	363	extern struct dentry_operations nfs_dentry_operations;
	364
	365	extern int nfs_instantiate(struct dentry dentry, struct nfs_fh fh, struct nfs_fattr *fattr);
	366
	367	/*
	368	* linux/fs/nfs/symlink.c
	369	*/
	370	extern struct inode_operations nfs_symlink_inode_operations;
	371
	372	/*
	373	* linux/fs/nfs/unlink.c
	374	*/
	375	extern int nfs_async_unlink(struct dentry *);
	376	extern void nfs_complete_unlink(struct dentry *);
	377
	378	/*
	379	* linux/fs/nfs/write.c
	380	*/
	381	extern int nfs_writepage(struct page page, struct writeback_control wbc);
	382	extern int nfs_writepages(struct address_space , struct writeback_control );
	383	extern int nfs_flush_incompatible(struct file file, struct page page);
	384	extern int nfs_updatepage(struct file , struct page , unsigned int, unsigned int);
	385	extern void nfs_writeback_done(struct rpc_task *task);
	386
	387	#if defined(CONFIG_NFS_V3) \|\| defined(CONFIG_NFS_V4)
	388	extern void nfs_commit_done(struct rpc_task *);
	389	#endif
	390
	391	/*
	392	* Try to write back everything synchronously (but check the
	393	* return value!)
	394	*/
	395	extern int nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
	396	#if defined(CONFIG_NFS_V3) \|\| defined(CONFIG_NFS_V4)
	397	extern int nfs_commit_inode(struct inode *, unsigned long, unsigned int, int);
	398	#else
	399	static inline int
	400	nfs_commit_inode(struct inode *inode, unsigned long idx_start, unsigned int npages, int how)
	401	{
	402	return 0;
	403	}
	404	#endif
	405
	406	static inline int
	407	nfs_have_writebacks(struct inode *inode)
	408	{
	409	return NFS_I(inode)->npages != 0;
	410	}
	411
	412	static inline int
	413	nfs_wb_all(struct inode *inode)
	414	{
	415	int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
	416	return (error < 0) ? error : 0;
	417	}
	418
	419	/*
	420	* Write back all requests on one page - we do this before reading it.
	421	*/
	422	static inline int nfs_wb_page_priority(struct inode inode, struct page page, int how)
	423	{
	424	int error = nfs_sync_inode(inode, page->index, 1,
	425	how \| FLUSH_WAIT \| FLUSH_STABLE);
426	return (error < 0) ? error : 0;
427	}
428
429	static inline int nfs_wb_page(struct inode inode, struct page page)
430	{
431	return nfs_wb_page_priority(inode, page, 0);
432	}
433
434	/*
435	* Allocate and free nfs_write_data structures
436	*/
437	extern mempool_t *nfs_wdata_mempool;
438
439	static inline struct nfs_write_data *nfs_writedata_alloc(void)
440	{
441	struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
442	if (p) {
443	memset(p, 0, sizeof(*p));
444	INIT_LIST_HEAD(&p->pages);
445	}
446	return p;
447	}
448
449	static inline void nfs_writedata_free(struct nfs_write_data *p)
450	{
451	mempool_free(p, nfs_wdata_mempool);
452	}
453
1da177e4 LT	454	/*
	455	* linux/fs/nfs/read.c
	456	*/
	457	extern int nfs_readpage(struct file , struct page );
	458	extern int nfs_readpages(struct file , struct address_space ,
	459	struct list_head *, unsigned);
	460	extern void nfs_readpage_result(struct rpc_task *);
	461
	462	/*
	463	* Allocate and free nfs_read_data structures
	464	*/
	465	extern mempool_t *nfs_rdata_mempool;
	466
	467	static inline struct nfs_read_data *nfs_readdata_alloc(void)
	468	{
	469	struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
	470	if (p)
	471	memset(p, 0, sizeof(*p));
	472	return p;
	473	}
	474
	475	static inline void nfs_readdata_free(struct nfs_read_data *p)
	476	{
	477	mempool_free(p, nfs_rdata_mempool);
	478	}
	479
	480	extern void nfs_readdata_release(struct rpc_task *task);
	481
b7fa0554 AG	482	/*
	483	* linux/fs/nfs3proc.c
	484	*/
	485	#ifdef CONFIG_NFS_V3_ACL
	486	extern struct posix_acl nfs3_proc_getacl(struct inode inode, int type);
	487	extern int nfs3_proc_setacl(struct inode *inode, int type,
	488	struct posix_acl *acl);
055ffbea AG	489	extern int nfs3_proc_set_default_acl(struct inode dir, struct inode inode,
055ffbea AG	490	mode_t mode);
5c6a9f7d	491	extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea AG	492	#else
	493	static inline int nfs3_proc_set_default_acl(struct inode *dir,
	494	struct inode *inode,
	495	mode_t mode)
	496	{
	497	return 0;
	498	}
5c6a9f7d AG	499
	500	static inline void nfs3_forget_cached_acls(struct inode *inode)
	501	{
	502	}
b7fa0554 AG	503	#endif /* CONFIG_NFS_V3_ACL */
b7fa0554 AG	504
1da177e4 LT	505	/*
	506	* linux/fs/mount_clnt.c
	507	* (Used only by nfsroot module)
	508	*/
	509	extern int nfsroot_mount(struct sockaddr_in , char , struct nfs_fh *,
	510	int, int);
	511
	512	/*
	513	* inline functions
	514	*/
	515
	516	static inline loff_t
	517	nfs_size_to_loff_t(__u64 size)
	518	{
	519	loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
	520	if (size > maxsz)
	521	return maxsz;
	522	return (loff_t) size;
	523	}
	524
	525	static inline ino_t
	526	nfs_fileid_to_ino_t(u64 fileid)
	527	{
	528	ino_t ino = (ino_t) fileid;
	529	if (sizeof(ino_t) < sizeof(u64))
	530	ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	531	return ino;
	532	}
	533
	534	/* NFS root */
	535
	536	extern void * nfs_root_data(void);
	537
	538	#define nfs_wait_event(clnt, wq, condition) \
	539	({ \
	540	int __retval = 0; \
	541	if (clnt->cl_intr) { \
	542	sigset_t oldmask; \
	543	rpc_clnt_sigmask(clnt, &oldmask); \
	544	__retval = wait_event_interruptible(wq, condition); \
	545	rpc_clnt_sigunmask(clnt, &oldmask); \
	546	} else \
	547	wait_event(wq, condition); \
	548	__retval; \
	549	})
	550
	551	#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
	552
1da177e4 LT	553	#endif /* __KERNEL__ */
	554
	555	/*
	556	* NFS debug flags
	557	*/
	558	#define NFSDBG_VFS 0x0001
	559	#define NFSDBG_DIRCACHE 0x0002
	560	#define NFSDBG_LOOKUPCACHE 0x0004
	561	#define NFSDBG_PAGECACHE 0x0008
	562	#define NFSDBG_PROC 0x0010
	563	#define NFSDBG_XDR 0x0020
	564	#define NFSDBG_FILE 0x0040
	565	#define NFSDBG_ROOT 0x0080
	566	#define NFSDBG_CALLBACK 0x0100
	567	#define NFSDBG_ALL 0xFFFF
	568
	569	#ifdef __KERNEL__
	570	# undef ifdebug
	571	# ifdef NFS_DEBUG
	572	# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
	573	# else
	574	# define ifdebug(fac) if (0)
	575	# endif
	576	#endif /* __KERNEL */
	577
	578	#endif