fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include <linux/mount.h>
   6
   7 struct nfs_string;
   8 struct nfs_mount_data;
   9 struct nfs4_mount_data;
  10
  11 /* Maximum number of readahead requests
  12  * FIXME: this should really be a sysctl so that users may tune it to suit
  13  *        their needs. People that do NFS over a slow network, might for
  14  *        instance want to reduce it to something closer to 1 for improved
  15  *        interactive response.
  16  */
  17 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  18
  19 struct nfs_clone_mount {
  20         const struct super_block *sb;
  21         const struct dentry *dentry;
  22         struct nfs_fh *fh;
  23         struct nfs_fattr *fattr;
  24         char *hostname;
  25         char *mnt_path;
  26         struct sockaddr_in *addr;
  27         rpc_authflavor_t authflavor;
  28 };
  29
  30 /* client.c */
  31 extern struct rpc_program nfs_program;
  32
  33 extern void nfs_put_client(struct nfs_client *);
  34 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
  35 extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
  36                                             struct nfs_fh *);
  37 extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
  38                                              const char *,
  39                                              const struct sockaddr_in *,
  40                                              const char *,
  41                                              const char *,
  42                                              rpc_authflavor_t,
  43                                              struct nfs_fh *);
  44 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
  45                                                       struct nfs_fh *);
  46 extern void nfs_free_server(struct nfs_server *server);
  47 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
  48                                            struct nfs_fh *,
  49                                            struct nfs_fattr *);
  50
  51 /* nfs4namespace.c */
  52 #ifdef CONFIG_NFS_V4
  53 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
  54 #else
  55 static inline
  56 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
  57 {
  58         return ERR_PTR(-ENOENT);
  59 }
  60 #endif
  61
  62 /* callback_xdr.c */
  63 extern struct svc_version nfs4_callback_version1;
  64
  65 /* pagelist.c */
  66 extern int __init nfs_init_nfspagecache(void);
  67 extern void nfs_destroy_nfspagecache(void);
  68 extern int __init nfs_init_readpagecache(void);
  69 extern void nfs_destroy_readpagecache(void);
  70 extern int __init nfs_init_writepagecache(void);
  71 extern void nfs_destroy_writepagecache(void);
  72
  73 #ifdef CONFIG_NFS_DIRECTIO
  74 extern int __init nfs_init_directcache(void);
  75 extern void nfs_destroy_directcache(void);
  76 #else
  77 #define nfs_init_directcache() (0)
  78 #define nfs_destroy_directcache() do {} while(0)
  79 #endif
  80
  81 /* nfs2xdr.c */
  82 extern int nfs_stat_to_errno(int);
  83 extern struct rpc_procinfo nfs_procedures[];
  84 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
  85
  86 /* nfs3xdr.c */
  87 extern struct rpc_procinfo nfs3_procedures[];
  88 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
  89
  90 /* nfs4xdr.c */
  91 #ifdef CONFIG_NFS_V4
  92 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  93 #endif
  94
  95 /* nfs4proc.c */
  96 #ifdef CONFIG_NFS_V4
  97 extern struct rpc_procinfo nfs4_procedures[];
  98
  99 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
 100                                   struct nfs4_fs_locations *fs_locations,
 101                                   struct page *page);
 102 #endif
 103
 104 /* dir.c */
 105 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
 106
 107 /* inode.c */
 108 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 109 extern void nfs_destroy_inode(struct inode *);
 110 extern int nfs_write_inode(struct inode *,int);
 111 extern void nfs_clear_inode(struct inode *);
 112 #ifdef CONFIG_NFS_V4
 113 extern void nfs4_clear_inode(struct inode *);
 114 #endif
 115
 116 /* super.c */
 117 extern struct file_system_type nfs_xdev_fs_type;
 118 #ifdef CONFIG_NFS_V4
 119 extern struct file_system_type nfs4_xdev_fs_type;
 120 extern struct file_system_type nfs4_referral_fs_type;
 121 #endif
 122
 123 extern struct rpc_stat nfs_rpcstat;
 124
 125 extern int __init register_nfs_fs(void);
 126 extern void __exit unregister_nfs_fs(void);
 127
 128 /* namespace.c */
 129 extern char *nfs_path(const char *base,
 130                       const struct dentry *droot,
 131                       const struct dentry *dentry,
 132                       char *buffer, ssize_t buflen);
 133
 134 /* getroot.c */
 135 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 136 #ifdef CONFIG_NFS_V4
 137 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 138
 139 extern int nfs4_path_walk(struct nfs_server *server,
 140                           struct nfs_fh *mntfh,
 141                           const char *path);
 142 #endif
 143
 144 /*
 145  * Determine the device name as a string
 146  */
 147 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 148                                 const struct dentry *dentry,
 149                                 char *buffer, ssize_t buflen)
 150 {
 151         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 152                         dentry, buffer, buflen);
 153 }
 154
 155 /*
 156  * Determine the actual block size (and log2 thereof)
 157  */
 158 static inline
 159 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 160 {
 161         /* make sure blocksize is a power of two */
 162         if ((bsize & (bsize - 1)) || nrbitsp) {
 163                 unsigned char   nrbits;
 164
 165                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 166                         ;
 167                 bsize = 1 << nrbits;
 168                 if (nrbitsp)
 169                         *nrbitsp = nrbits;
 170         }
 171
 172         return bsize;
 173 }
 174
 175 /*
 176  * Calculate the number of 512byte blocks used.
 177  */
 178 static inline unsigned long nfs_calc_block_size(u64 tsize)
 179 {
 180         loff_t used = (tsize + 511) >> 9;
 181         return (used > ULONG_MAX) ? ULONG_MAX : used;
 182 }
 183
 184 /*
 185  * Compute and set NFS server blocksize
 186  */
 187 static inline
 188 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 189 {
 190         if (bsize < NFS_MIN_FILE_IO_SIZE)
 191                 bsize = NFS_DEF_FILE_IO_SIZE;
 192         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 193                 bsize = NFS_MAX_FILE_IO_SIZE;
 194
 195         return nfs_block_bits(bsize, nrbitsp);
 196 }
 197
 198 /*
 199  * Determine the maximum file size for a superblock
 200  */
 201 static inline
 202 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 203 {
 204         sb->s_maxbytes = (loff_t)maxfilesize;
 205         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 206                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 207 }