/* * 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 #include #include #include #include #include #include #include #include #include /* * Enable debugging support for nfs client. * Requires RPC_DEBUG. */ #ifdef RPC_DEBUG # define NFS_DEBUG #endif /* * NFS_MAX_DIRCACHE controls the number of simultaneously cached * directory chunks. Each chunk holds the list of nfs_entry's returned * in a single readdir call in a memory region of size PAGE_SIZE. * * Note that at most server->rsize bytes of the cache memory are used. */ #define NFS_MAX_DIRCACHE 16 #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_MAX_RPC_TIMEOUT (6*HZ) #define NFS_READ_DELAY (2*HZ) #define NFS_WRITEBACK_DELAY (5*HZ) #define NFS_WRITEBACK_LOCKDELAY (60*HZ) #define NFS_COMMIT_DELAY (5*HZ) /* * Size of the lookup cache in units of number of entries cached. * It is better not to make this too large although the optimum * depends on a usage and environment. */ #define NFS_LOOKUP_CACHE_SIZE 64 /* * superblock magic number for NFS */ #define NFS_SUPER_MAGIC 0x6969 #define NFS_FH(dentry) ((struct nfs_fh *) ((dentry)->d_fsdata)) #define NFS_DSERVER(dentry) (&(dentry)->d_sb->u.nfs_sb.s_server) #define NFS_SERVER(inode) (&(inode)->i_sb->u.nfs_sb.s_server) #define NFS_CLIENT(inode) (NFS_SERVER(inode)->client) #define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops) #define NFS_REQUESTLIST(inode) (NFS_SERVER(inode)->rw_requests) #define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode))) #define NFS_CONGESTED(inode) (RPC_CONGESTED(NFS_CLIENT(inode))) #define NFS_COOKIEVERF(inode) ((inode)->u.nfs_i.cookieverf) #define NFS_READTIME(inode) ((inode)->u.nfs_i.read_cache_jiffies) #define NFS_CACHE_CTIME(inode) ((inode)->u.nfs_i.read_cache_ctime) #define NFS_CACHE_MTIME(inode) ((inode)->u.nfs_i.read_cache_mtime) #define NFS_CACHE_ATIME(inode) ((inode)->u.nfs_i.read_cache_atime) #define NFS_CACHE_ISIZE(inode) ((inode)->u.nfs_i.read_cache_isize) #define NFS_NEXTSCAN(inode) ((inode)->u.nfs_i.nextscan) #define NFS_CACHEINV(inode) \ do { \ NFS_READTIME(inode) = jiffies - NFS_MAXATTRTIMEO(inode) - 1; \ } while (0) #define NFS_ATTRTIMEO(inode) ((inode)->u.nfs_i.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) ((inode)->u.nfs_i.attrtimeo_timestamp) #define NFS_FLAGS(inode) ((inode)->u.nfs_i.flags) #define NFS_REVALIDATING(inode) (NFS_FLAGS(inode) & NFS_INO_REVALIDATING) #define NFS_FILEID(inode) ((inode)->u.nfs_i.fileid) #define NFS_FSID(inode) ((inode)->u.nfs_i.fsid) /* Inode Flags */ #define NFS_USE_READDIRPLUS(inode) ((NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS) ? 1 : 0) /* * These are the default flags for swap requests */ #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) /* Flags in the RPC client structure */ #define NFS_CLNTF_BUFSIZE 0x0001 /* readdir buffer in longwords */ #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 */ static inline loff_t page_offset(struct page *page) { return ((loff_t)page->index) << PAGE_CACHE_SHIFT; } static inline unsigned long page_index(struct page *page) { return page->index; } #ifdef __KERNEL__ /* * linux/fs/nfs/inode.c */ extern struct super_block *nfs_read_super(struct super_block *, void *, int); extern int init_nfs_fs(void); extern void nfs_zap_caches(struct inode *); extern struct inode *nfs_fhget(struct dentry *, struct nfs_fh *, struct nfs_fattr *); extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); extern int nfs_revalidate(struct dentry *); 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 dentry *); extern int nfs_notify_change(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 = (struct rpc_cred *)(file->private_data); #ifdef RPC_DEBUG if (cred && cred->cr_magic != RPCAUTH_CRED_MAGIC) BUG(); #endif return cred; } /* * 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/write.c */ extern int nfs_writepage(struct file *file, struct page *); extern int nfs_flush_incompatible(struct file *file, struct page *page); extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); /* * 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_timeout(struct inode *, int); #ifdef CONFIG_NFS_V3 extern int nfs_commit_file(struct inode *, struct file *, unsigned long, unsigned int, int); extern int nfs_commit_timeout(struct inode *, int); #endif static inline int nfs_have_read(struct inode *inode) { return !list_empty(&inode->u.nfs_i.read); } static inline int nfs_have_writebacks(struct inode *inode) { return !list_empty(&inode->u.nfs_i.writeback); } 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(page), 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; } /* * linux/fs/nfs/read.c */ extern int nfs_readpage(struct file *, struct page *); extern int nfs_pagein_inode(struct inode *, unsigned long, unsigned int); extern int nfs_pagein_timeout(struct inode *); /* * linux/fs/mount_clnt.c * (Used only by nfsroot module) */ extern int nfs_mount(struct sockaddr_in *, char *, struct nfs_fh *); extern int nfs3_mount(struct sockaddr_in *, char *, struct nfs_fh *); /* * inline functions */ static inline int nfs_revalidate_inode(struct nfs_server *server, struct dentry *dentry) { struct inode *inode = dentry->d_inode; if (time_before(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode))) return 0; return __nfs_revalidate_inode(server, dentry); } 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; } static inline time_t nfs_time_to_secs(__u64 time) { return (time_t)(time >> 32); } /* 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; \ }) #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