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/*
* 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/uio.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>
/*
* 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
/*
* The upper limit on timeouts for the exponential backoff algorithm.
*/
#define NFS_WRITEBACK_DELAY (5*HZ)
#define NFS_WRITEBACK_LOCKDELAY (60*HZ)
#define NFS_COMMIT_DELAY (5*HZ)
/*
* 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)
#define NFS_RW_SYNC 0x0001 /* O_SYNC handling */
#define NFS_RW_SWAP 0x0002 /* This is a swap request */
/*
* 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 */
#ifdef __KERNEL__
/*
* NFSv3 Access mode cache
*/
struct nfs_access_cache {
unsigned long jiffies;
struct rpc_cred * cred;
int mask;
int err;
};
/*
* 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 short 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;
struct timespec read_cache_ctime;
struct timespec read_cache_mtime;
__u64 read_cache_isize;
unsigned long attrtimeo;
unsigned long attrtimeo_timestamp;
__u64 change_attr; /* v4 only */
/*
* Timestamp that dates the change made to read_cache_mtime.
* This is of use for dentry revalidation
*/
unsigned long cache_mtime_jiffies;
struct nfs_access_cache cache_access;
/*
* This is the cookie verifier used for NFSv3 readdir
* operations
*/
__u32 cookieverf[2];
/*
* This is the list of dirty unwritten pages.
*/
struct list_head dirty;
struct list_head commit;
struct radix_tree_root nfs_page_tree;
unsigned int ndirty,
ncommit,
npages;
/* Credentials for shared mmap */
struct rpc_cred *mm_cred;
wait_queue_head_t nfs_i_wait;
#ifdef CONFIG_NFS_V4
/* NFSv4 state */
struct list_head open_states;
#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_FLUSH 0x0008 /* inode is due for flushing */
#define NFS_INO_FAKE_ROOT 0x0080 /* root inode placeholder */
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_MTIME_UPDATE(inode) (NFS_I(inode)->cache_mtime_jiffies)
#define NFS_CACHE_CTIME(inode) (NFS_I(inode)->read_cache_ctime)
#define NFS_CACHE_MTIME(inode) (NFS_I(inode)->read_cache_mtime)
#define NFS_CACHE_ISIZE(inode) (NFS_I(inode)->read_cache_isize)
#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
#define NFS_CACHEINV(inode) \
do { \
NFS_READTIME(inode) = jiffies - NFS_MAXATTRTIMEO(inode) - 1; \
} while (0)
#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_FAKE_ROOT(inode) (NFS_FLAGS(inode) & NFS_INO_FAKE_ROOT)
#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
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;
}
static inline
loff_t page_offset(struct page *page)
{
return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
}
/*
* 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 void nfs_set_mmcred(struct inode *, struct rpc_cred *);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_release(struct inode *, struct file *);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern int nfs_setattr(struct dentry *, struct iattr *);
/*
* linux/fs/nfs/file.c
*/
extern struct inode_operations nfs_file_inode_operations;
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)
{
struct rpc_cred *cred = NULL;
if (file)
cred = (struct rpc_cred *)file->private_data;
#ifdef RPC_DEBUG
if (cred && cred->cr_magic != RPCAUTH_CRED_MAGIC)
BUG();
#endif
return cred;
}
/*
* linux/fs/nfs/direct.c
*/
extern int nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
unsigned long);
/*
* linux/fs/nfs/dir.c
*/
extern struct inode_operations nfs_dir_inode_operations;
extern struct file_operations nfs_dir_operations;
extern struct dentry_operations nfs_dentry_operations;
/*
* linux/fs/nfs/symlink.c
*/
extern struct inode_operations nfs_symlink_inode_operations;
/*
* linux/fs/nfs/locks.c
*/
extern int nfs_lock(struct file *, int, struct file_lock *);
/*
* 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);
extern void nfs_writedata_release(struct rpc_task *task);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern void nfs_commit_release(struct rpc_task *task);
extern void nfs_commit_done(struct rpc_task *);
#endif
/*
* Try to write back everything synchronously (but check the
* return value!)
*/
extern int nfs_sync_file(struct inode *, struct file *, unsigned long, unsigned int, int);
extern int nfs_flush_file(struct inode *, struct file *, unsigned long, unsigned int, int);
extern int nfs_flush_list(struct list_head *, int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int nfs_commit_file(struct inode *, struct file *, unsigned long, unsigned int, int);
extern int nfs_commit_list(struct list_head *, int);
#else
static inline int
nfs_commit_file(struct inode *inode, struct file *file, unsigned long offset,
unsigned int len, int flags)
{
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_file(inode, 0, 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(struct inode *inode, struct page* page)
{
int error = nfs_sync_file(inode, 0, page->index, 1,
FLUSH_WAIT | FLUSH_STABLE);
return (error < 0) ? error : 0;
}
/*
* Write back all pending writes for one user..
*/
static inline int
nfs_wb_file(struct inode *inode, struct file *file)
{
int error = nfs_sync_file(inode, file, 0, 0, FLUSH_WAIT);
return (error < 0) ? error : 0;
}
/* Hack for future NFS swap support */
#ifndef IS_SWAPFILE
# define IS_SWAPFILE(inode) (0)
#endif
/*
* 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 int nfs_pagein_list(struct list_head *, int);
extern void nfs_readpage_result(struct rpc_task *);
extern void nfs_readdata_release(struct rpc_task *);
/*
* 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 int
nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
if (time_before(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode)))
return NFS_STALE(inode) ? -ESTALE : 0;
return __nfs_revalidate_inode(server, inode);
}
static inline int
nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
return __nfs_refresh_inode(inode,fattr);
}
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)
#ifdef CONFIG_NFS_V4
/*
* In a seqid-mutating op, this macro controls which error return
* values trigger incrementation of the seqid.
*
* from rfc 3010:
* The client MUST monotonically increment the sequence number for the
* CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
* operations. This is true even in the event that the previous
* operation that used the sequence number received an error. The only
* exception to this rule is if the previous operation received one of
* the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
* NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
* NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
*
*/
#define seqid_mutating_err(err) \
(((err) != NFSERR_STALE_CLIENTID) && \
((err) != NFSERR_STALE_STATEID) && \
((err) != NFSERR_BAD_STATEID) && \
((err) != NFSERR_BAD_SEQID) && \
((err) != NFSERR_BAD_XDR) && \
((err) != NFSERR_RESOURCE) && \
((err) != NFSERR_NOFILEHANDLE))
enum nfs4_client_state {
NFS4CLNT_OK = 0,
NFS4CLNT_NEW,
};
/*
* The nfs4_client identifies our client state to the server.
*/
struct nfs4_client {
struct list_head cl_servers; /* Global list of servers */
struct in_addr cl_addr; /* Server identifier */
u64 cl_clientid; /* constant */
nfs4_verifier cl_confirm;
enum nfs4_client_state cl_state;
u32 cl_lockowner_id;
/*
* The following rwsem ensures exclusive access to the server
* while we recover the state following a lease expiration.
*/
struct rw_semaphore cl_sem;
struct list_head cl_state_owners;
struct list_head cl_unused;
int cl_nunused;
spinlock_t cl_lock;
atomic_t cl_count;
};
/*
* NFS4 state_owners and lock_owners are simply labels for ordered
* sequences of RPC calls. Their sole purpose is to provide once-only
* semantics by allowing the server to identify replayed requests.
*
* The ->so_sema is held during all state_owner seqid-mutating operations:
* OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
* so_seqid.
*/
struct nfs4_state_owner {
struct list_head so_list; /* per-clientid list of state_owners */
struct nfs4_client *so_client;
u32 so_id; /* 32-bit identifier, unique */
struct semaphore so_sema;
u32 so_seqid; /* protected by so_sema */
unsigned int so_flags; /* protected by so_sema */
atomic_t so_count;
struct rpc_cred *so_cred; /* Associated cred */
struct list_head so_states;
};
/*
* struct nfs4_state maintains the client-side state for a given
* (state_owner,inode) tuple.
*
* In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
* we need to know how many files are open for reading or writing on a
* given inode. This information too is stored here.
*/
struct nfs4_state {
struct list_head open_states; /* List of states for the same state_owner */
struct list_head inode_states; /* List of states for the same inode */
struct nfs4_state_owner *owner; /* Pointer to the open owner */
struct inode *inode; /* Pointer to the inode */
pid_t pid; /* Thread that called OPEN */
nfs4_stateid stateid;
int state; /* State on the server (R,W, or RW) */
atomic_t count;
};
/* nfs4proc.c */
extern int nfs4_proc_renew(struct nfs_server *server);
extern int nfs4_do_close(struct inode *, struct nfs4_state *);
/* nfs4renewd.c */
extern int nfs4_init_renewd(struct nfs_server *server);
/* nfs4state.c */
extern struct nfs4_client *nfs4_get_client(struct in_addr *);
extern void nfs4_put_client(struct nfs4_client *clp);
extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
extern void nfs4_put_state_owner(struct nfs4_state_owner *);
extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
extern void nfs4_put_open_state(struct nfs4_state *);
extern void nfs4_increment_seqid(u32 status, struct nfs4_state_owner *sp);
struct nfs4_mount_data;
static inline int
create_nfsv4_state(struct nfs_server *server, struct nfs4_mount_data *data)
{
server->nfs4_state = NULL;
return 0;
}
static inline void
destroy_nfsv4_state(struct nfs_server *server)
{
if (server->mnt_path) {
kfree(server->mnt_path);
server->mnt_path = NULL;
}
if (server->nfs4_state) {
nfs4_put_client(server->nfs4_state);
server->nfs4_state = NULL;
}
}
#else
#define create_nfsv4_state(server, data) 0
#define destroy_nfsv4_state(server) do { } while (0)
#define nfs4_put_state_owner(inode, owner) do { } while (0)
#define nfs4_put_open_state(state) do { } while (0)
#endif
#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_ALL 0xFFFF
#ifdef __KERNEL__
# undef ifdebug
# ifdef NFS_DEBUG
# define ifdebug(fac) if (nfs_debug & NFSDBG_##fac)
# else
# define ifdebug(fac) if (0)
# endif
#endif /* __KERNEL */
#endif