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 #ifdef CONFIG_PROC_FS
  51 extern int __init nfs_fs_proc_init(void);
  52 extern void nfs_fs_proc_exit(void);
  53 #else
  54 static inline int nfs_fs_proc_init(void)
  55 {
  56         return 0;
  57 }
  58 static inline void nfs_fs_proc_exit(void)
  59 {
  60 }
  61 #endif
  62
  63 /* nfs4namespace.c */
  64 #ifdef CONFIG_NFS_V4
  65 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
  66 #else
  67 static inline
  68 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
  69 {
  70         return ERR_PTR(-ENOENT);
  71 }
  72 #endif
  73
  74 /* callback_xdr.c */
  75 extern struct svc_version nfs4_callback_version1;
  76
  77 /* pagelist.c */
  78 extern int __init nfs_init_nfspagecache(void);
  79 extern void nfs_destroy_nfspagecache(void);
  80 extern int __init nfs_init_readpagecache(void);
  81 extern void nfs_destroy_readpagecache(void);
  82 extern int __init nfs_init_writepagecache(void);
  83 extern void nfs_destroy_writepagecache(void);
  84
  85 #ifdef CONFIG_NFS_DIRECTIO
  86 extern int __init nfs_init_directcache(void);
  87 extern void nfs_destroy_directcache(void);
  88 #else
  89 #define nfs_init_directcache() (0)
  90 #define nfs_destroy_directcache() do {} while(0)
  91 #endif
  92
  93 /* nfs2xdr.c */
  94 extern int nfs_stat_to_errno(int);
  95 extern struct rpc_procinfo nfs_procedures[];
  96 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
  97
  98 /* nfs3xdr.c */
  99 extern struct rpc_procinfo nfs3_procedures[];
 100 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
 101
 102 /* nfs4xdr.c */
 103 #ifdef CONFIG_NFS_V4
 104 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 105 #endif
 106
 107 /* nfs4proc.c */
 108 #ifdef CONFIG_NFS_V4
 109 extern struct rpc_procinfo nfs4_procedures[];
 110
 111 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
 112                                   struct nfs4_fs_locations *fs_locations,
 113                                   struct page *page);
 114 #endif
 115
 116 /* dir.c */
 117 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
 118
 119 /* inode.c */
 120 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 121 extern void nfs_destroy_inode(struct inode *);
 122 extern int nfs_write_inode(struct inode *,int);
 123 extern void nfs_clear_inode(struct inode *);
 124 #ifdef CONFIG_NFS_V4
 125 extern void nfs4_clear_inode(struct inode *);
 126 #endif
 127
 128 /* super.c */
 129 extern struct file_system_type nfs_xdev_fs_type;
 130 #ifdef CONFIG_NFS_V4
 131 extern struct file_system_type nfs4_xdev_fs_type;
 132 extern struct file_system_type nfs4_referral_fs_type;
 133 #endif
 134
 135 extern struct rpc_stat nfs_rpcstat;
 136
 137 extern int __init register_nfs_fs(void);
 138 extern void __exit unregister_nfs_fs(void);
 139
 140 /* namespace.c */
 141 extern char *nfs_path(const char *base,
 142                       const struct dentry *droot,
 143                       const struct dentry *dentry,
 144                       char *buffer, ssize_t buflen);
 145
 146 /* getroot.c */
 147 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 148 #ifdef CONFIG_NFS_V4
 149 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 150
 151 extern int nfs4_path_walk(struct nfs_server *server,
 152                           struct nfs_fh *mntfh,
 153                           const char *path);
 154 #endif
 155
 156 /*
 157  * Determine the device name as a string
 158  */
 159 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 160                                 const struct dentry *dentry,
 161                                 char *buffer, ssize_t buflen)
 162 {
 163         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 164                         dentry, buffer, buflen);
 165 }
 166
 167 /*
 168  * Determine the actual block size (and log2 thereof)
 169  */
 170 static inline
 171 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 172 {
 173         /* make sure blocksize is a power of two */
 174         if ((bsize & (bsize - 1)) || nrbitsp) {
 175                 unsigned char   nrbits;
 176
 177                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 178                         ;
 179                 bsize = 1 << nrbits;
 180                 if (nrbitsp)
 181                         *nrbitsp = nrbits;
 182         }
 183
 184         return bsize;
 185 }
 186
 187 /*
 188  * Calculate the number of 512byte blocks used.
 189  */
 190 static inline unsigned long nfs_calc_block_size(u64 tsize)
 191 {
 192         loff_t used = (tsize + 511) >> 9;
 193         return (used > ULONG_MAX) ? ULONG_MAX : used;
 194 }
 195
 196 /*
 197  * Compute and set NFS server blocksize
 198  */
 199 static inline
 200 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 201 {
 202         if (bsize < NFS_MIN_FILE_IO_SIZE)
 203                 bsize = NFS_DEF_FILE_IO_SIZE;
 204         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 205                 bsize = NFS_MAX_FILE_IO_SIZE;
 206
 207         return nfs_block_bits(bsize, nrbitsp);
 208 }
 209
 210 /*
 211  * Determine the maximum file size for a superblock
 212  */
 213 static inline
 214 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 215 {
 216         sb->s_maxbytes = (loff_t)maxfilesize;
 217         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 218                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 219 }