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 struct nfs_mount_data; 954ceac45SDavid Howells struct nfs4_mount_data; 1054ceac45SDavid Howells 1154ceac45SDavid Howells /* Maximum number of readahead requests 1254ceac45SDavid Howells * FIXME: this should really be a sysctl so that users may tune it to suit 1354ceac45SDavid Howells * their needs. People that do NFS over a slow network, might for 1454ceac45SDavid Howells * instance want to reduce it to something closer to 1 for improved 1554ceac45SDavid Howells * interactive response. 1654ceac45SDavid Howells */ 1754ceac45SDavid Howells #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 1854ceac45SDavid Howells 19f7b422b1SDavid Howells struct nfs_clone_mount { 20f7b422b1SDavid Howells const struct super_block *sb; 21f7b422b1SDavid Howells const struct dentry *dentry; 22f7b422b1SDavid Howells struct nfs_fh *fh; 23f7b422b1SDavid Howells struct nfs_fattr *fattr; 24f7b422b1SDavid Howells char *hostname; 25f7b422b1SDavid Howells char *mnt_path; 26f7b422b1SDavid Howells struct sockaddr_in *addr; 27f7b422b1SDavid Howells rpc_authflavor_t authflavor; 28f7b422b1SDavid Howells }; 29f7b422b1SDavid Howells 3024c8dbbbSDavid Howells /* client.c */ 3154ceac45SDavid Howells extern struct rpc_program nfs_program; 3254ceac45SDavid Howells 3324c8dbbbSDavid Howells extern void nfs_put_client(struct nfs_client *); 3424c8dbbbSDavid Howells extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int); 3554ceac45SDavid Howells extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *, 3654ceac45SDavid Howells struct nfs_fh *); 3754ceac45SDavid Howells extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *, 3854ceac45SDavid Howells const char *, 3954ceac45SDavid Howells const struct sockaddr_in *, 4054ceac45SDavid Howells const char *, 4154ceac45SDavid Howells const char *, 4254ceac45SDavid Howells rpc_authflavor_t, 4354ceac45SDavid Howells struct nfs_fh *); 4454ceac45SDavid Howells extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 4554ceac45SDavid Howells struct nfs_fh *); 4654ceac45SDavid Howells extern void nfs_free_server(struct nfs_server *server); 4754ceac45SDavid Howells extern struct nfs_server *nfs_clone_server(struct nfs_server *, 4854ceac45SDavid Howells struct nfs_fh *, 4954ceac45SDavid Howells struct nfs_fattr *); 5024c8dbbbSDavid Howells 517d4e2747SDavid Howells /* nfs4namespace.c */ 52f7b422b1SDavid Howells #ifdef CONFIG_NFS_V4 53f7b422b1SDavid Howells extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 54f7b422b1SDavid Howells #else 55f7b422b1SDavid Howells static inline 56f7b422b1SDavid Howells struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 57f7b422b1SDavid Howells { 58f7b422b1SDavid Howells return ERR_PTR(-ENOENT); 59f7b422b1SDavid Howells } 60f7b422b1SDavid Howells #endif 61f7b422b1SDavid Howells 62f7b422b1SDavid Howells /* callback_xdr.c */ 63f7b422b1SDavid Howells extern struct svc_version nfs4_callback_version1; 64f7b422b1SDavid Howells 65f7b422b1SDavid Howells /* pagelist.c */ 66f7b422b1SDavid Howells extern int __init nfs_init_nfspagecache(void); 67266bee88SDavid Brownell extern void nfs_destroy_nfspagecache(void); 68f7b422b1SDavid Howells extern int __init nfs_init_readpagecache(void); 69266bee88SDavid Brownell extern void nfs_destroy_readpagecache(void); 70f7b422b1SDavid Howells extern int __init nfs_init_writepagecache(void); 71266bee88SDavid Brownell extern void nfs_destroy_writepagecache(void); 72f7b422b1SDavid Howells 73f7b422b1SDavid Howells #ifdef CONFIG_NFS_DIRECTIO 74f7b422b1SDavid Howells extern int __init nfs_init_directcache(void); 75266bee88SDavid Brownell extern void nfs_destroy_directcache(void); 76f7b422b1SDavid Howells #else 77f7b422b1SDavid Howells #define nfs_init_directcache() (0) 78f7b422b1SDavid Howells #define nfs_destroy_directcache() do {} while(0) 79f7b422b1SDavid Howells #endif 80f7b422b1SDavid Howells 81f7b422b1SDavid Howells /* nfs2xdr.c */ 827d4e2747SDavid Howells extern int nfs_stat_to_errno(int); 83f7b422b1SDavid Howells extern struct rpc_procinfo nfs_procedures[]; 84f7b422b1SDavid Howells extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int); 85f7b422b1SDavid Howells 86f7b422b1SDavid Howells /* nfs3xdr.c */ 87f7b422b1SDavid Howells extern struct rpc_procinfo nfs3_procedures[]; 88f7b422b1SDavid Howells extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int); 89f7b422b1SDavid Howells 90f7b422b1SDavid Howells /* nfs4xdr.c */ 917d4e2747SDavid Howells #ifdef CONFIG_NFS_V4 92f7b422b1SDavid Howells extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus); 937d4e2747SDavid Howells #endif 94f7b422b1SDavid Howells 95f7b422b1SDavid Howells /* nfs4proc.c */ 96d75d5414SAndrew Morton #ifdef CONFIG_NFS_V4 97f7b422b1SDavid Howells extern struct rpc_procinfo nfs4_procedures[]; 98f7b422b1SDavid Howells 99f7b422b1SDavid Howells extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry, 100f7b422b1SDavid Howells struct nfs4_fs_locations *fs_locations, 101f7b422b1SDavid Howells struct page *page); 102d75d5414SAndrew Morton #endif 103f7b422b1SDavid Howells 104979df72eSTrond Myklebust /* dir.c */ 105979df72eSTrond Myklebust extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 106979df72eSTrond Myklebust 107f7b422b1SDavid Howells /* inode.c */ 108f7b422b1SDavid Howells extern struct inode *nfs_alloc_inode(struct super_block *sb); 109f7b422b1SDavid Howells extern void nfs_destroy_inode(struct inode *); 110f7b422b1SDavid Howells extern int nfs_write_inode(struct inode *,int); 111f7b422b1SDavid Howells extern void nfs_clear_inode(struct inode *); 112f7b422b1SDavid Howells #ifdef CONFIG_NFS_V4 113f7b422b1SDavid Howells extern void nfs4_clear_inode(struct inode *); 114f7b422b1SDavid Howells #endif 115f7b422b1SDavid Howells 116f7b422b1SDavid Howells /* super.c */ 11754ceac45SDavid Howells extern struct file_system_type nfs_xdev_fs_type; 118f7b422b1SDavid Howells #ifdef CONFIG_NFS_V4 11954ceac45SDavid Howells extern struct file_system_type nfs4_xdev_fs_type; 12054ceac45SDavid Howells extern struct file_system_type nfs4_referral_fs_type; 121f7b422b1SDavid Howells #endif 1224ebd9ab3SDominik Hackl 123f7b422b1SDavid Howells extern struct rpc_stat nfs_rpcstat; 1244ebd9ab3SDominik Hackl 125f7b422b1SDavid Howells extern int __init register_nfs_fs(void); 126f7b422b1SDavid Howells extern void __exit unregister_nfs_fs(void); 127f7b422b1SDavid Howells 128f7b422b1SDavid Howells /* namespace.c */ 12954ceac45SDavid Howells extern char *nfs_path(const char *base, 13054ceac45SDavid Howells const struct dentry *droot, 13154ceac45SDavid Howells const struct dentry *dentry, 132f7b422b1SDavid Howells char *buffer, ssize_t buflen); 133f7b422b1SDavid Howells 13454ceac45SDavid Howells /* getroot.c */ 13554ceac45SDavid Howells extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 1367d4e2747SDavid Howells #ifdef CONFIG_NFS_V4 13754ceac45SDavid Howells extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 13854ceac45SDavid Howells 13954ceac45SDavid Howells extern int nfs4_path_walk(struct nfs_server *server, 14054ceac45SDavid Howells struct nfs_fh *mntfh, 14154ceac45SDavid Howells const char *path); 1427d4e2747SDavid Howells #endif 143f7b422b1SDavid Howells 144f7b422b1SDavid Howells /* 145f7b422b1SDavid Howells * Determine the device name as a string 146f7b422b1SDavid Howells */ 147f7b422b1SDavid Howells static inline char *nfs_devname(const struct vfsmount *mnt_parent, 148f7b422b1SDavid Howells const struct dentry *dentry, 149f7b422b1SDavid Howells char *buffer, ssize_t buflen) 150f7b422b1SDavid Howells { 15154ceac45SDavid Howells return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 15254ceac45SDavid Howells dentry, buffer, buflen); 153f7b422b1SDavid Howells } 154f7b422b1SDavid Howells 155f7b422b1SDavid Howells /* 156f7b422b1SDavid Howells * Determine the actual block size (and log2 thereof) 157f7b422b1SDavid Howells */ 158f7b422b1SDavid Howells static inline 159f7b422b1SDavid Howells unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 160f7b422b1SDavid Howells { 161f7b422b1SDavid Howells /* make sure blocksize is a power of two */ 162f7b422b1SDavid Howells if ((bsize & (bsize - 1)) || nrbitsp) { 163f7b422b1SDavid Howells unsigned char nrbits; 164f7b422b1SDavid Howells 165f7b422b1SDavid Howells for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 166f7b422b1SDavid Howells ; 167f7b422b1SDavid Howells bsize = 1 << nrbits; 168f7b422b1SDavid Howells if (nrbitsp) 169f7b422b1SDavid Howells *nrbitsp = nrbits; 170f7b422b1SDavid Howells } 171f7b422b1SDavid Howells 172f7b422b1SDavid Howells return bsize; 173f7b422b1SDavid Howells } 174f7b422b1SDavid Howells 175f7b422b1SDavid Howells /* 176f7b422b1SDavid Howells * Calculate the number of 512byte blocks used. 177f7b422b1SDavid Howells */ 178f7b422b1SDavid Howells static inline unsigned long nfs_calc_block_size(u64 tsize) 179f7b422b1SDavid Howells { 180f7b422b1SDavid Howells loff_t used = (tsize + 511) >> 9; 181f7b422b1SDavid Howells return (used > ULONG_MAX) ? ULONG_MAX : used; 182f7b422b1SDavid Howells } 183f7b422b1SDavid Howells 184f7b422b1SDavid Howells /* 185f7b422b1SDavid Howells * Compute and set NFS server blocksize 186f7b422b1SDavid Howells */ 187f7b422b1SDavid Howells static inline 188f7b422b1SDavid Howells unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 189f7b422b1SDavid Howells { 190f7b422b1SDavid Howells if (bsize < NFS_MIN_FILE_IO_SIZE) 191f7b422b1SDavid Howells bsize = NFS_DEF_FILE_IO_SIZE; 192f7b422b1SDavid Howells else if (bsize >= NFS_MAX_FILE_IO_SIZE) 193f7b422b1SDavid Howells bsize = NFS_MAX_FILE_IO_SIZE; 194f7b422b1SDavid Howells 195f7b422b1SDavid Howells return nfs_block_bits(bsize, nrbitsp); 196f7b422b1SDavid Howells } 197f7b422b1SDavid Howells 198f7b422b1SDavid Howells /* 199f7b422b1SDavid Howells * Determine the maximum file size for a superblock 200f7b422b1SDavid Howells */ 201f7b422b1SDavid Howells static inline 202f7b422b1SDavid Howells void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 203f7b422b1SDavid Howells { 204f7b422b1SDavid Howells sb->s_maxbytes = (loff_t)maxfilesize; 205f7b422b1SDavid Howells if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 206f7b422b1SDavid Howells sb->s_maxbytes = MAX_LFS_FILESIZE; 207f7b422b1SDavid Howells } 208