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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 /* Default timeout values */ #define NFS_MAX_UDP_TIMEOUT (60*HZ) #define NFS_MAX_TCP_TIMEOUT (600*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) /* * 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 */ #define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */ #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 long flags; /* atomic bit ops */ unsigned long cache_validity; /* bit mask */ /* * 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 */ unsigned long last_updated; /* "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; #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; }; /* * Cache validity bit flags */ #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */ #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */ #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */ #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */ #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */ #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */ /* * Bit offsets in flags field */ #define NFS_INO_REVALIDATING (0) /* revalidating attrs */ #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */ #define NFS_INO_STALE (2) /* possible stale inode */ 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_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode))) #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_mark_for_revalidate(struct inode *inode) { spin_lock(&inode->i_lock); NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS; spin_unlock(&inode->i_lock); } static inline void NFS_CACHEINV(struct inode *inode) { if (!nfs_caches_unstable(inode)) nfs_mark_for_revalidate(inode); } 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 test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); } /** * 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) && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute); } /* * linux/fs/nfs/inode.c */ extern int nfs_sync_mapping(struct address_space *mapping); 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_post_op_update_inode(struct inode *inode, struct nfs_fattr *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_setattr_update_inode(struct inode *inode, struct iattr *attr); 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, struct rpc_cred *cred, 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*/ static inline void nfs_fattr_init(struct nfs_fattr *fattr) { fattr->valid = 0; fattr->time_start = jiffies; } /* * 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/sysctl.c */ #ifdef CONFIG_SYSCTL extern int nfs_register_sysctl(void); extern void nfs_unregister_sysctl(void); #else #define nfs_register_sysctl() 0 #define nfs_unregister_sysctl() do { } while(0) #endif /* * 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, void *data); extern void nfs_writedata_release(void *data); #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) extern void nfs_commit_done(struct rpc_task *, void *data); extern void nfs_commit_release(void *data); #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(unsigned int pagecount) { struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); if (p) { memset(p, 0, sizeof(*p)); INIT_LIST_HEAD(&p->pages); if (pagecount < NFS_PAGEVEC_SIZE) p->pagevec = &p->page_array[0]; else { size_t size = ++pagecount * sizeof(struct page *); p->pagevec = kmalloc(size, GFP_NOFS); if (p->pagevec) { memset(p->pagevec, 0, size); } else { mempool_free(p, nfs_wdata_mempool); p = NULL; } } } return p; } static inline void nfs_writedata_free(struct nfs_write_data *p) { if (p && (p->pagevec != &p->page_array[0])) kfree(p->pagevec); 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 *, void *); extern void nfs_readdata_release(void *data); /* * Allocate and free nfs_read_data structures */ extern mempool_t *nfs_rdata_mempool; static inline struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount) { struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS); if (p) { memset(p, 0, sizeof(*p)); INIT_LIST_HEAD(&p->pages); if (pagecount < NFS_PAGEVEC_SIZE) p->pagevec = &p->page_array[0]; else { size_t size = ++pagecount * sizeof(struct page *); p->pagevec = kmalloc(size, GFP_NOFS); if (p->pagevec) { memset(p->pagevec, 0, size); } else { mempool_free(p, nfs_rdata_mempool); p = NULL; } } } return p; } static inline void nfs_readdata_free(struct nfs_read_data *p) { if (p && (p->pagevec != &p->page_array[0])) kfree(p->pagevec); mempool_free(p, nfs_rdata_mempool); } /* * 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