1f7b422b1SDavid Howells /* 2f7b422b1SDavid Howells * NFS internal definitions 3f7b422b1SDavid Howells */ 4f7b422b1SDavid Howells 5f7b422b1SDavid Howells #include <linux/mount.h> 6f7b422b1SDavid Howells 754ceac45SDavid Howells struct nfs_string; 854ceac45SDavid Howells 954ceac45SDavid Howells /* Maximum number of readahead requests 1054ceac45SDavid Howells * FIXME: this should really be a sysctl so that users may tune it to suit 1154ceac45SDavid Howells * their needs. People that do NFS over a slow network, might for 1254ceac45SDavid Howells * instance want to reduce it to something closer to 1 for improved 1354ceac45SDavid Howells * interactive response. 1454ceac45SDavid Howells */ 1554ceac45SDavid Howells #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 1654ceac45SDavid Howells 17f7b422b1SDavid Howells struct nfs_clone_mount { 18f7b422b1SDavid Howells const struct super_block *sb; 19f7b422b1SDavid Howells const struct dentry *dentry; 20f7b422b1SDavid Howells struct nfs_fh *fh; 21f7b422b1SDavid Howells struct nfs_fattr *fattr; 22f7b422b1SDavid Howells char *hostname; 23f7b422b1SDavid Howells char *mnt_path; 246677d095SChuck Lever struct sockaddr *addr; 256677d095SChuck Lever size_t addrlen; 26f7b422b1SDavid Howells rpc_authflavor_t authflavor; 27f7b422b1SDavid Howells }; 28f7b422b1SDavid Howells 296b18eaa0S\"Talpey, Thomas\ /* 306b18eaa0S\"Talpey, Thomas\ * In-kernel mount arguments 316b18eaa0S\"Talpey, Thomas\ */ 326b18eaa0S\"Talpey, Thomas\ struct nfs_parsed_mount_data { 336b18eaa0S\"Talpey, Thomas\ int flags; 346b18eaa0S\"Talpey, Thomas\ int rsize, wsize; 356b18eaa0S\"Talpey, Thomas\ int timeo, retrans; 366b18eaa0S\"Talpey, Thomas\ int acregmin, acregmax, 376b18eaa0S\"Talpey, Thomas\ acdirmin, acdirmax; 386b18eaa0S\"Talpey, Thomas\ int namlen; 396b18eaa0S\"Talpey, Thomas\ unsigned int bsize; 406b18eaa0S\"Talpey, Thomas\ unsigned int auth_flavor_len; 416b18eaa0S\"Talpey, Thomas\ rpc_authflavor_t auth_flavors[1]; 426b18eaa0S\"Talpey, Thomas\ char *client_address; 436b18eaa0S\"Talpey, Thomas\ 446b18eaa0S\"Talpey, Thomas\ struct { 454c568017SChuck Lever struct sockaddr_storage address; 464c568017SChuck Lever size_t addrlen; 476b18eaa0S\"Talpey, Thomas\ char *hostname; 486b18eaa0S\"Talpey, Thomas\ unsigned int version; 496b18eaa0S\"Talpey, Thomas\ unsigned short port; 506b18eaa0S\"Talpey, Thomas\ int protocol; 516b18eaa0S\"Talpey, Thomas\ } mount_server; 526b18eaa0S\"Talpey, Thomas\ 536b18eaa0S\"Talpey, Thomas\ struct { 544c568017SChuck Lever struct sockaddr_storage address; 554c568017SChuck Lever size_t addrlen; 566b18eaa0S\"Talpey, Thomas\ char *hostname; 576b18eaa0S\"Talpey, Thomas\ char *export_path; 586b18eaa0S\"Talpey, Thomas\ int protocol; 596b18eaa0S\"Talpey, Thomas\ } nfs_server; 606b18eaa0S\"Talpey, Thomas\ }; 616b18eaa0S\"Talpey, Thomas\ 6224c8dbbbSDavid Howells /* client.c */ 6354ceac45SDavid Howells extern struct rpc_program nfs_program; 6454ceac45SDavid Howells 6524c8dbbbSDavid Howells extern void nfs_put_client(struct nfs_client *); 66ff052645SChuck Lever extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 673fbd67adSTrond Myklebust extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 682283f8d6S\"Talpey, Thomas\ extern struct nfs_server *nfs_create_server( 692283f8d6S\"Talpey, Thomas\ const struct nfs_parsed_mount_data *, 7054ceac45SDavid Howells struct nfs_fh *); 7191ea40b9S\"Talpey, Thomas\ extern struct nfs_server *nfs4_create_server( 7291ea40b9S\"Talpey, Thomas\ const struct nfs_parsed_mount_data *, 7354ceac45SDavid Howells struct nfs_fh *); 7454ceac45SDavid Howells extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 7554ceac45SDavid Howells struct nfs_fh *); 7654ceac45SDavid Howells extern void nfs_free_server(struct nfs_server *server); 7754ceac45SDavid Howells extern struct nfs_server *nfs_clone_server(struct nfs_server *, 7854ceac45SDavid Howells struct nfs_fh *, 7954ceac45SDavid Howells struct nfs_fattr *); 806aaca566SDavid Howells #ifdef CONFIG_PROC_FS 816aaca566SDavid Howells extern int __init nfs_fs_proc_init(void); 826aaca566SDavid Howells extern void nfs_fs_proc_exit(void); 836aaca566SDavid Howells #else 846aaca566SDavid Howells static inline int nfs_fs_proc_init(void) 856aaca566SDavid Howells { 866aaca566SDavid Howells return 0; 876aaca566SDavid Howells } 886aaca566SDavid Howells static inline void nfs_fs_proc_exit(void) 896aaca566SDavid Howells { 906aaca566SDavid Howells } 916aaca566SDavid Howells #endif 9224c8dbbbSDavid Howells 937d4e2747SDavid Howells /* nfs4namespace.c */ 94f7b422b1SDavid Howells #ifdef CONFIG_NFS_V4 95f7b422b1SDavid Howells extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 96f7b422b1SDavid Howells #else 97f7b422b1SDavid Howells static inline 98f7b422b1SDavid Howells struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 99f7b422b1SDavid Howells { 100f7b422b1SDavid Howells return ERR_PTR(-ENOENT); 101f7b422b1SDavid Howells } 102f7b422b1SDavid Howells #endif 103f7b422b1SDavid Howells 104f7b422b1SDavid Howells /* callback_xdr.c */ 105f7b422b1SDavid Howells extern struct svc_version nfs4_callback_version1; 106f7b422b1SDavid Howells 107f7b422b1SDavid Howells /* pagelist.c */ 108f7b422b1SDavid Howells extern int __init nfs_init_nfspagecache(void); 109266bee88SDavid Brownell extern void nfs_destroy_nfspagecache(void); 110f7b422b1SDavid Howells extern int __init nfs_init_readpagecache(void); 111266bee88SDavid Brownell extern void nfs_destroy_readpagecache(void); 112f7b422b1SDavid Howells extern int __init nfs_init_writepagecache(void); 113266bee88SDavid Brownell extern void nfs_destroy_writepagecache(void); 114f7b422b1SDavid Howells 115f7b422b1SDavid Howells #ifdef CONFIG_NFS_DIRECTIO 116f7b422b1SDavid Howells extern int __init nfs_init_directcache(void); 117266bee88SDavid Brownell extern void nfs_destroy_directcache(void); 118f7b422b1SDavid Howells #else 119f7b422b1SDavid Howells #define nfs_init_directcache() (0) 120f7b422b1SDavid Howells #define nfs_destroy_directcache() do {} while(0) 121f7b422b1SDavid Howells #endif 122f7b422b1SDavid Howells 123f7b422b1SDavid Howells /* nfs2xdr.c */ 1247d4e2747SDavid Howells extern int nfs_stat_to_errno(int); 125f7b422b1SDavid Howells extern struct rpc_procinfo nfs_procedures[]; 1260dbb4c67SAl Viro extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 127f7b422b1SDavid Howells 128f7b422b1SDavid Howells /* nfs3xdr.c */ 129f7b422b1SDavid Howells extern struct rpc_procinfo nfs3_procedures[]; 1300dbb4c67SAl Viro extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 131f7b422b1SDavid Howells 132f7b422b1SDavid Howells /* nfs4xdr.c */ 1337d4e2747SDavid Howells #ifdef CONFIG_NFS_V4 1340dbb4c67SAl Viro extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 1357d4e2747SDavid Howells #endif 136f7b422b1SDavid Howells 137f7b422b1SDavid Howells /* nfs4proc.c */ 138d75d5414SAndrew Morton #ifdef CONFIG_NFS_V4 139f7b422b1SDavid Howells extern struct rpc_procinfo nfs4_procedures[]; 140d75d5414SAndrew Morton #endif 141f7b422b1SDavid Howells 142979df72eSTrond Myklebust /* dir.c */ 143979df72eSTrond Myklebust extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 144979df72eSTrond Myklebust 145f7b422b1SDavid Howells /* inode.c */ 1465746006fSTrond Myklebust extern struct workqueue_struct *nfsiod_workqueue; 147f7b422b1SDavid Howells extern struct inode *nfs_alloc_inode(struct super_block *sb); 148f7b422b1SDavid Howells extern void nfs_destroy_inode(struct inode *); 149f7b422b1SDavid Howells extern int nfs_write_inode(struct inode *,int); 150f7b422b1SDavid Howells extern void nfs_clear_inode(struct inode *); 151f7b422b1SDavid Howells #ifdef CONFIG_NFS_V4 152f7b422b1SDavid Howells extern void nfs4_clear_inode(struct inode *); 153f7b422b1SDavid Howells #endif 154f7b422b1SDavid Howells 155f7b422b1SDavid Howells /* super.c */ 15654ceac45SDavid Howells extern struct file_system_type nfs_xdev_fs_type; 157f7b422b1SDavid Howells #ifdef CONFIG_NFS_V4 15854ceac45SDavid Howells extern struct file_system_type nfs4_xdev_fs_type; 15954ceac45SDavid Howells extern struct file_system_type nfs4_referral_fs_type; 160f7b422b1SDavid Howells #endif 1614ebd9ab3SDominik Hackl 162f7b422b1SDavid Howells extern struct rpc_stat nfs_rpcstat; 1634ebd9ab3SDominik Hackl 164f7b422b1SDavid Howells extern int __init register_nfs_fs(void); 165f7b422b1SDavid Howells extern void __exit unregister_nfs_fs(void); 166ef818a28SSteve Dickson extern void nfs_sb_active(struct nfs_server *server); 167ef818a28SSteve Dickson extern void nfs_sb_deactive(struct nfs_server *server); 168f7b422b1SDavid Howells 169f7b422b1SDavid Howells /* namespace.c */ 17054ceac45SDavid Howells extern char *nfs_path(const char *base, 17154ceac45SDavid Howells const struct dentry *droot, 17254ceac45SDavid Howells const struct dentry *dentry, 173f7b422b1SDavid Howells char *buffer, ssize_t buflen); 174f7b422b1SDavid Howells 17554ceac45SDavid Howells /* getroot.c */ 17654ceac45SDavid Howells extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 1777d4e2747SDavid Howells #ifdef CONFIG_NFS_V4 17854ceac45SDavid Howells extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 17954ceac45SDavid Howells 18054ceac45SDavid Howells extern int nfs4_path_walk(struct nfs_server *server, 18154ceac45SDavid Howells struct nfs_fh *mntfh, 18254ceac45SDavid Howells const char *path); 1837d4e2747SDavid Howells #endif 184f7b422b1SDavid Howells 185f7b422b1SDavid Howells /* 186f7b422b1SDavid Howells * Determine the device name as a string 187f7b422b1SDavid Howells */ 188f7b422b1SDavid Howells static inline char *nfs_devname(const struct vfsmount *mnt_parent, 189f7b422b1SDavid Howells const struct dentry *dentry, 190f7b422b1SDavid Howells char *buffer, ssize_t buflen) 191f7b422b1SDavid Howells { 19254ceac45SDavid Howells return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 19354ceac45SDavid Howells dentry, buffer, buflen); 194f7b422b1SDavid Howells } 195f7b422b1SDavid Howells 196f7b422b1SDavid Howells /* 197f7b422b1SDavid Howells * Determine the actual block size (and log2 thereof) 198f7b422b1SDavid Howells */ 199f7b422b1SDavid Howells static inline 200f7b422b1SDavid Howells unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 201f7b422b1SDavid Howells { 202f7b422b1SDavid Howells /* make sure blocksize is a power of two */ 203f7b422b1SDavid Howells if ((bsize & (bsize - 1)) || nrbitsp) { 204f7b422b1SDavid Howells unsigned char nrbits; 205f7b422b1SDavid Howells 206f7b422b1SDavid Howells for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 207f7b422b1SDavid Howells ; 208f7b422b1SDavid Howells bsize = 1 << nrbits; 209f7b422b1SDavid Howells if (nrbitsp) 210f7b422b1SDavid Howells *nrbitsp = nrbits; 211f7b422b1SDavid Howells } 212f7b422b1SDavid Howells 213f7b422b1SDavid Howells return bsize; 214f7b422b1SDavid Howells } 215f7b422b1SDavid Howells 216f7b422b1SDavid Howells /* 217f7b422b1SDavid Howells * Calculate the number of 512byte blocks used. 218f7b422b1SDavid Howells */ 2199eaa67c6SChuck Lever static inline blkcnt_t nfs_calc_block_size(u64 tsize) 220f7b422b1SDavid Howells { 2219eaa67c6SChuck Lever blkcnt_t used = (tsize + 511) >> 9; 222f7b422b1SDavid Howells return (used > ULONG_MAX) ? ULONG_MAX : used; 223f7b422b1SDavid Howells } 224f7b422b1SDavid Howells 225f7b422b1SDavid Howells /* 226f7b422b1SDavid Howells * Compute and set NFS server blocksize 227f7b422b1SDavid Howells */ 228f7b422b1SDavid Howells static inline 229f7b422b1SDavid Howells unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 230f7b422b1SDavid Howells { 231f7b422b1SDavid Howells if (bsize < NFS_MIN_FILE_IO_SIZE) 232f7b422b1SDavid Howells bsize = NFS_DEF_FILE_IO_SIZE; 233f7b422b1SDavid Howells else if (bsize >= NFS_MAX_FILE_IO_SIZE) 234f7b422b1SDavid Howells bsize = NFS_MAX_FILE_IO_SIZE; 235f7b422b1SDavid Howells 236f7b422b1SDavid Howells return nfs_block_bits(bsize, nrbitsp); 237f7b422b1SDavid Howells } 238f7b422b1SDavid Howells 239f7b422b1SDavid Howells /* 240f7b422b1SDavid Howells * Determine the maximum file size for a superblock 241f7b422b1SDavid Howells */ 242f7b422b1SDavid Howells static inline 243f7b422b1SDavid Howells void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 244f7b422b1SDavid Howells { 245f7b422b1SDavid Howells sb->s_maxbytes = (loff_t)maxfilesize; 246f7b422b1SDavid Howells if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 247f7b422b1SDavid Howells sb->s_maxbytes = MAX_LFS_FILESIZE; 248f7b422b1SDavid Howells } 24949a70f27STrond Myklebust 25049a70f27STrond Myklebust /* 25149a70f27STrond Myklebust * Determine the number of bytes of data the page contains 25249a70f27STrond Myklebust */ 25349a70f27STrond Myklebust static inline 25449a70f27STrond Myklebust unsigned int nfs_page_length(struct page *page) 25549a70f27STrond Myklebust { 25649a70f27STrond Myklebust loff_t i_size = i_size_read(page->mapping->host); 25749a70f27STrond Myklebust 25849a70f27STrond Myklebust if (i_size > 0) { 25949a70f27STrond Myklebust pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 26049a70f27STrond Myklebust if (page->index < end_index) 26149a70f27STrond Myklebust return PAGE_CACHE_SIZE; 26249a70f27STrond Myklebust if (page->index == end_index) 26349a70f27STrond Myklebust return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 26449a70f27STrond Myklebust } 26549a70f27STrond Myklebust return 0; 26649a70f27STrond Myklebust } 2678d5658c9STrond Myklebust 2688d5658c9STrond Myklebust /* 2698d5658c9STrond Myklebust * Determine the number of pages in an array of length 'len' and 2708d5658c9STrond Myklebust * with a base offset of 'base' 2718d5658c9STrond Myklebust */ 2728d5658c9STrond Myklebust static inline 2738d5658c9STrond Myklebust unsigned int nfs_page_array_len(unsigned int base, size_t len) 2748d5658c9STrond Myklebust { 2758d5658c9STrond Myklebust return ((unsigned long)len + (unsigned long)base + 2768d5658c9STrond Myklebust PAGE_SIZE - 1) >> PAGE_SHIFT; 2778d5658c9STrond Myklebust } 2788d5658c9STrond Myklebust 279