fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include <linux/mount.h>
   6
   7 struct nfs_clone_mount {
   8         const struct super_block *sb;
   9         const struct dentry *dentry;
  10         struct nfs_fh *fh;
  11         struct nfs_fattr *fattr;
  12         char *hostname;
  13         char *mnt_path;
  14         struct sockaddr_in *addr;
  15         rpc_authflavor_t authflavor;
  16 };
  17
  18 /* namespace-nfs4.c */
  19 #ifdef CONFIG_NFS_V4
  20 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
  21 #else
  22 static inline
  23 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
  24 {
  25         return ERR_PTR(-ENOENT);
  26 }
  27 #endif
  28
  29 /* callback_xdr.c */
  30 extern struct svc_version nfs4_callback_version1;
  31
  32 /* pagelist.c */
  33 extern int __init nfs_init_nfspagecache(void);
  34 extern void __exit nfs_destroy_nfspagecache(void);
  35 extern int __init nfs_init_readpagecache(void);
  36 extern void __exit nfs_destroy_readpagecache(void);
  37 extern int __init nfs_init_writepagecache(void);
  38 extern void __exit nfs_destroy_writepagecache(void);
  39
  40 #ifdef CONFIG_NFS_DIRECTIO
  41 extern int __init nfs_init_directcache(void);
  42 extern void __exit nfs_destroy_directcache(void);
  43 #else
  44 #define nfs_init_directcache() (0)
  45 #define nfs_destroy_directcache() do {} while(0)
  46 #endif
  47
  48 /* nfs2xdr.c */
  49 extern struct rpc_procinfo nfs_procedures[];
  50 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
  51
  52 /* nfs3xdr.c */
  53 extern struct rpc_procinfo nfs3_procedures[];
  54 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
  55
  56 /* nfs4xdr.c */
  57 extern int nfs_stat_to_errno(int);
  58 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  59
  60 /* nfs4proc.c */
  61 #ifdef CONFIG_NFS_V4
  62 extern struct rpc_procinfo nfs4_procedures[];
  63
  64 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
  65                                   struct nfs4_fs_locations *fs_locations,
  66                                   struct page *page);
  67 #endif
  68
  69 /* inode.c */
  70 extern struct inode *nfs_alloc_inode(struct super_block *sb);
  71 extern void nfs_destroy_inode(struct inode *);
  72 extern int nfs_write_inode(struct inode *,int);
  73 extern void nfs_clear_inode(struct inode *);
  74 #ifdef CONFIG_NFS_V4
  75 extern void nfs4_clear_inode(struct inode *);
  76 #endif
  77
  78 /* super.c */
  79 extern struct file_system_type nfs_referral_nfs4_fs_type;
  80 extern struct file_system_type clone_nfs_fs_type;
  81 #ifdef CONFIG_NFS_V4
  82 extern struct file_system_type clone_nfs4_fs_type;
  83 #endif
  84 #ifdef CONFIG_PROC_FS
  85 extern struct rpc_stat nfs_rpcstat;
  86 #endif
  87 extern int __init register_nfs_fs(void);
  88 extern void __exit unregister_nfs_fs(void);
  89
  90 /* namespace.c */
  91 extern char *nfs_path(const char *base, const struct dentry *dentry,
  92                       char *buffer, ssize_t buflen);
  93
  94 /*
  95  * Determine the mount path as a string
  96  */
  97 static inline char *
  98 nfs4_path(const struct dentry *dentry, char *buffer, ssize_t buflen)
  99 {
 100 #ifdef CONFIG_NFS_V4
 101         return nfs_path(NFS_SB(dentry->d_sb)->mnt_path, dentry, buffer, buflen);
 102 #else
 103         return NULL;
 104 #endif
 105 }
 106
 107 /*
 108  * Determine the device name as a string
 109  */
 110 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 111                          const struct dentry *dentry,
 112                          char *buffer, ssize_t buflen)
 113 {
 114         return nfs_path(mnt_parent->mnt_devname, dentry, buffer, buflen);
 115 }
 116
 117 /*
 118  * Determine the actual block size (and log2 thereof)
 119  */
 120 static inline
 121 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 122 {
 123         /* make sure blocksize is a power of two */
 124         if ((bsize & (bsize - 1)) || nrbitsp) {
 125                 unsigned char   nrbits;
 126
 127                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 128                         ;
 129                 bsize = 1 << nrbits;
 130                 if (nrbitsp)
 131                         *nrbitsp = nrbits;
 132         }
 133
 134         return bsize;
 135 }
 136
 137 /*
 138  * Calculate the number of 512byte blocks used.
 139  */
 140 static inline unsigned long nfs_calc_block_size(u64 tsize)
 141 {
 142         loff_t used = (tsize + 511) >> 9;
 143         return (used > ULONG_MAX) ? ULONG_MAX : used;
 144 }
 145
 146 /*
 147  * Compute and set NFS server blocksize
 148  */
 149 static inline
 150 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 151 {
 152         if (bsize < NFS_MIN_FILE_IO_SIZE)
 153                 bsize = NFS_DEF_FILE_IO_SIZE;
 154         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 155                 bsize = NFS_MAX_FILE_IO_SIZE;
 156
 157         return nfs_block_bits(bsize, nrbitsp);
 158 }
 159
 160 /*
 161  * Determine the maximum file size for a superblock
 162  */
 163 static inline
 164 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 165 {
 166         sb->s_maxbytes = (loff_t)maxfilesize;
 167         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 168                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 169 }
 170
 171 /*
 172  * Check if the string represents a "valid" IPv4 address
 173  */
 174 static inline int valid_ipaddr4(const char *buf)
 175 {
 176         int rc, count, in[4];
 177
 178         rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
 179         if (rc != 4)
 180                 return -EINVAL;
 181         for (count = 0; count < 4; count++) {
 182                 if (in[count] > 255)
 183                         return -EINVAL;
 184         }
 185         return 0;
 186 }