/* * NFS internal definitions */ #include <linux/mount.h> struct nfs_string; /* Maximum number of readahead requests * FIXME: this should really be a sysctl so that users may tune it to suit * their needs. People that do NFS over a slow network, might for * instance want to reduce it to something closer to 1 for improved * interactive response. */ #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) struct nfs_clone_mount { const struct super_block *sb; const struct dentry *dentry; struct nfs_fh *fh; struct nfs_fattr *fattr; char *hostname; char *mnt_path; struct sockaddr *addr; size_t addrlen; rpc_authflavor_t authflavor; }; /* * In-kernel mount arguments */ struct nfs_parsed_mount_data { int flags; int rsize, wsize; int timeo, retrans; int acregmin, acregmax, acdirmin, acdirmax; int namlen; unsigned int bsize; unsigned int auth_flavor_len; rpc_authflavor_t auth_flavors[1]; char *client_address; struct { struct sockaddr_storage address; size_t addrlen; char *hostname; unsigned int version; unsigned short port; int protocol; } mount_server; struct { struct sockaddr_storage address; size_t addrlen; char *hostname; char *export_path; int protocol; } nfs_server; }; /* client.c */ extern struct rpc_program nfs_program; extern void nfs_put_client(struct nfs_client *); extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); extern struct nfs_client *nfs_find_client_next(struct nfs_client *); extern struct nfs_server *nfs_create_server( const struct nfs_parsed_mount_data *, struct nfs_fh *); extern struct nfs_server *nfs4_create_server( const struct nfs_parsed_mount_data *, struct nfs_fh *); extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, struct nfs_fh *); extern void nfs_free_server(struct nfs_server *server); extern struct nfs_server *nfs_clone_server(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *); #ifdef CONFIG_PROC_FS extern int __init nfs_fs_proc_init(void); extern void nfs_fs_proc_exit(void); #else static inline int nfs_fs_proc_init(void) { return 0; } static inline void nfs_fs_proc_exit(void) { } #endif /* nfs4namespace.c */ #ifdef CONFIG_NFS_V4 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); #else static inline struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) { return ERR_PTR(-ENOENT); } #endif /* callback_xdr.c */ extern struct svc_version nfs4_callback_version1; /* pagelist.c */ extern int __init nfs_init_nfspagecache(void); extern void nfs_destroy_nfspagecache(void); extern int __init nfs_init_readpagecache(void); extern void nfs_destroy_readpagecache(void); extern int __init nfs_init_writepagecache(void); extern void nfs_destroy_writepagecache(void); #ifdef CONFIG_NFS_DIRECTIO extern int __init nfs_init_directcache(void); extern void nfs_destroy_directcache(void); #else #define nfs_init_directcache() (0) #define nfs_destroy_directcache() do {} while(0) #endif /* nfs2xdr.c */ extern int nfs_stat_to_errno(int); extern struct rpc_procinfo nfs_procedures[]; extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); /* nfs3xdr.c */ extern struct rpc_procinfo nfs3_procedures[]; extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); /* nfs4xdr.c */ #ifdef CONFIG_NFS_V4 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); #endif /* nfs4proc.c */ #ifdef CONFIG_NFS_V4 extern struct rpc_procinfo nfs4_procedures[]; #endif /* dir.c */ extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); /* inode.c */ extern struct inode *nfs_alloc_inode(struct super_block *sb); extern void nfs_destroy_inode(struct inode *); extern int nfs_write_inode(struct inode *,int); extern void nfs_clear_inode(struct inode *); #ifdef CONFIG_NFS_V4 extern void nfs4_clear_inode(struct inode *); #endif /* super.c */ extern struct file_system_type nfs_xdev_fs_type; #ifdef CONFIG_NFS_V4 extern struct file_system_type nfs4_xdev_fs_type; extern struct file_system_type nfs4_referral_fs_type; #endif extern struct rpc_stat nfs_rpcstat; extern int __init register_nfs_fs(void); extern void __exit unregister_nfs_fs(void); extern void nfs_sb_active(struct nfs_server *server); extern void nfs_sb_deactive(struct nfs_server *server); /* namespace.c */ extern char *nfs_path(const char *base, const struct dentry *droot, const struct dentry *dentry, char *buffer, ssize_t buflen); /* getroot.c */ extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); #ifdef CONFIG_NFS_V4 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); extern int nfs4_path_walk(struct nfs_server *server, struct nfs_fh *mntfh, const char *path); #endif /* * Determine the device name as a string */ static inline char *nfs_devname(const struct vfsmount *mnt_parent, const struct dentry *dentry, char *buffer, ssize_t buflen) { return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, dentry, buffer, buflen); } /* * Determine the actual block size (and log2 thereof) */ static inline unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) { /* make sure blocksize is a power of two */ if ((bsize & (bsize - 1)) || nrbitsp) { unsigned char nrbits; for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) ; bsize = 1 << nrbits; if (nrbitsp) *nrbitsp = nrbits; } return bsize; } /* * Calculate the number of 512byte blocks used. */ static inline blkcnt_t nfs_calc_block_size(u64 tsize) { blkcnt_t used = (tsize + 511) >> 9; return (used > ULONG_MAX) ? ULONG_MAX : used; } /* * Compute and set NFS server blocksize */ static inline unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) { if (bsize < NFS_MIN_FILE_IO_SIZE) bsize = NFS_DEF_FILE_IO_SIZE; else if (bsize >= NFS_MAX_FILE_IO_SIZE) bsize = NFS_MAX_FILE_IO_SIZE; return nfs_block_bits(bsize, nrbitsp); } /* * Determine the maximum file size for a superblock */ static inline void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) { sb->s_maxbytes = (loff_t)maxfilesize; if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) sb->s_maxbytes = MAX_LFS_FILESIZE; } /* * Determine the number of bytes of data the page contains */ static inline unsigned int nfs_page_length(struct page *page) { loff_t i_size = i_size_read(page->mapping->host); if (i_size > 0) { pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; if (page->index < end_index) return PAGE_CACHE_SIZE; if (page->index == end_index) return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; } return 0; } /* * Determine the number of pages in an array of length 'len' and * with a base offset of 'base' */ static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) { return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> PAGE_SHIFT; }