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linux-sg2042/include/linux/nfs_fs.h

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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/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 */
#define NFS_INO_REVAL_PAGECACHE 0x1000 /* must revalidate pagecache */
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 *, int);
#else
static inline int
nfs_commit_inode(struct inode *inode, 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
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