fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include <linux/mount.h>
   6 #include <linux/security.h>
   7
   8 struct nfs_string;
   9
  10 /* Maximum number of readahead requests
  11  * FIXME: this should really be a sysctl so that users may tune it to suit
  12  *        their needs. People that do NFS over a slow network, might for
  13  *        instance want to reduce it to something closer to 1 for improved
  14  *        interactive response.
  15  */
  16 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  17
  18 struct nfs_clone_mount {
  19         const struct super_block *sb;
  20         const struct dentry *dentry;
  21         struct nfs_fh *fh;
  22         struct nfs_fattr *fattr;
  23         char *hostname;
  24         char *mnt_path;
  25         struct sockaddr *addr;
  26         size_t addrlen;
  27         rpc_authflavor_t authflavor;
  28 };
  29
  30 /*
  31  * In-kernel mount arguments
  32  */
  33 struct nfs_parsed_mount_data {
  34         int                     flags;
  35         int                     rsize, wsize;
  36         int                     timeo, retrans;
  37         int                     acregmin, acregmax,
  38                                 acdirmin, acdirmax;
  39         int                     namlen;
  40         unsigned int            bsize;
  41         unsigned int            auth_flavor_len;
  42         rpc_authflavor_t        auth_flavors[1];
  43         char                    *client_address;
  44
  45         struct {
  46                 struct sockaddr_storage address;
  47                 size_t                  addrlen;
  48                 char                    *hostname;
  49                 unsigned int            version;
  50                 unsigned short          port;
  51                 int                     protocol;
  52         } mount_server;
  53
  54         struct {
  55                 struct sockaddr_storage address;
  56                 size_t                  addrlen;
  57                 char                    *hostname;
  58                 char                    *export_path;
  59                 int                     protocol;
  60         } nfs_server;
  61
  62         struct security_mnt_opts lsm_opts;
  63 };
  64
  65 /* client.c */
  66 extern struct rpc_program nfs_program;
  67
  68 extern void nfs_put_client(struct nfs_client *);
  69 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
  70 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
  71 extern struct nfs_server *nfs_create_server(
  72                                         const struct nfs_parsed_mount_data *,
  73                                         struct nfs_fh *);
  74 extern struct nfs_server *nfs4_create_server(
  75                                         const struct nfs_parsed_mount_data *,
  76                                         struct nfs_fh *);
  77 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
  78                                                       struct nfs_fh *);
  79 extern void nfs_free_server(struct nfs_server *server);
  80 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
  81                                            struct nfs_fh *,
  82                                            struct nfs_fattr *);
  83 #ifdef CONFIG_PROC_FS
  84 extern int __init nfs_fs_proc_init(void);
  85 extern void nfs_fs_proc_exit(void);
  86 #else
  87 static inline int nfs_fs_proc_init(void)
  88 {
  89         return 0;
  90 }
  91 static inline void nfs_fs_proc_exit(void)
  92 {
  93 }
  94 #endif
  95
  96 /* nfs4namespace.c */
  97 #ifdef CONFIG_NFS_V4
  98 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
  99 #else
 100 static inline
 101 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
 102 {
 103         return ERR_PTR(-ENOENT);
 104 }
 105 #endif
 106
 107 /* callback_xdr.c */
 108 extern struct svc_version nfs4_callback_version1;
 109
 110 /* pagelist.c */
 111 extern int __init nfs_init_nfspagecache(void);
 112 extern void nfs_destroy_nfspagecache(void);
 113 extern int __init nfs_init_readpagecache(void);
 114 extern void nfs_destroy_readpagecache(void);
 115 extern int __init nfs_init_writepagecache(void);
 116 extern void nfs_destroy_writepagecache(void);
 117
 118 #ifdef CONFIG_NFS_DIRECTIO
 119 extern int __init nfs_init_directcache(void);
 120 extern void nfs_destroy_directcache(void);
 121 #else
 122 #define nfs_init_directcache() (0)
 123 #define nfs_destroy_directcache() do {} while(0)
 124 #endif
 125
 126 /* nfs2xdr.c */
 127 extern int nfs_stat_to_errno(int);
 128 extern struct rpc_procinfo nfs_procedures[];
 129 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
 130
 131 /* nfs3xdr.c */
 132 extern struct rpc_procinfo nfs3_procedures[];
 133 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
 134
 135 /* nfs4xdr.c */
 136 #ifdef CONFIG_NFS_V4
 137 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 138 #endif
 139
 140 /* nfs4proc.c */
 141 #ifdef CONFIG_NFS_V4
 142 extern struct rpc_procinfo nfs4_procedures[];
 143 #endif
 144
 145 /* dir.c */
 146 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
 147
 148 /* inode.c */
 149 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 150 extern void nfs_destroy_inode(struct inode *);
 151 extern int nfs_write_inode(struct inode *,int);
 152 extern void nfs_clear_inode(struct inode *);
 153 #ifdef CONFIG_NFS_V4
 154 extern void nfs4_clear_inode(struct inode *);
 155 #endif
 156
 157 /* super.c */
 158 extern struct file_system_type nfs_xdev_fs_type;
 159 #ifdef CONFIG_NFS_V4
 160 extern struct file_system_type nfs4_xdev_fs_type;
 161 extern struct file_system_type nfs4_referral_fs_type;
 162 #endif
 163
 164 extern struct rpc_stat nfs_rpcstat;
 165
 166 extern int __init register_nfs_fs(void);
 167 extern void __exit unregister_nfs_fs(void);
 168 extern void nfs_sb_active(struct nfs_server *server);
 169 extern void nfs_sb_deactive(struct nfs_server *server);
 170
 171 /* namespace.c */
 172 extern char *nfs_path(const char *base,
 173                       const struct dentry *droot,
 174                       const struct dentry *dentry,
 175                       char *buffer, ssize_t buflen);
 176
 177 /* getroot.c */
 178 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 179 #ifdef CONFIG_NFS_V4
 180 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 181
 182 extern int nfs4_path_walk(struct nfs_server *server,
 183                           struct nfs_fh *mntfh,
 184                           const char *path);
 185 #endif
 186
 187 /*
 188  * Determine the device name as a string
 189  */
 190 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 191                                 const struct dentry *dentry,
 192                                 char *buffer, ssize_t buflen)
 193 {
 194         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 195                         dentry, buffer, buflen);
 196 }
 197
 198 /*
 199  * Determine the actual block size (and log2 thereof)
 200  */
 201 static inline
 202 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 203 {
 204         /* make sure blocksize is a power of two */
 205         if ((bsize & (bsize - 1)) || nrbitsp) {
 206                 unsigned char   nrbits;
 207
 208                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 209                         ;
 210                 bsize = 1 << nrbits;
 211                 if (nrbitsp)
 212                         *nrbitsp = nrbits;
 213         }
 214
 215         return bsize;
 216 }
 217
 218 /*
 219  * Calculate the number of 512byte blocks used.
 220  */
 221 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 222 {
 223         blkcnt_t used = (tsize + 511) >> 9;
 224         return (used > ULONG_MAX) ? ULONG_MAX : used;
 225 }
 226
 227 /*
 228  * Compute and set NFS server blocksize
 229  */
 230 static inline
 231 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 232 {
 233         if (bsize < NFS_MIN_FILE_IO_SIZE)
 234                 bsize = NFS_DEF_FILE_IO_SIZE;
 235         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 236                 bsize = NFS_MAX_FILE_IO_SIZE;
 237
 238         return nfs_block_bits(bsize, nrbitsp);
 239 }
 240
 241 /*
 242  * Determine the maximum file size for a superblock
 243  */
 244 static inline
 245 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 246 {
 247         sb->s_maxbytes = (loff_t)maxfilesize;
 248         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 249                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 250 }
 251
 252 /*
 253  * Determine the number of bytes of data the page contains
 254  */
 255 static inline
 256 unsigned int nfs_page_length(struct page *page)
 257 {
 258         loff_t i_size = i_size_read(page->mapping->host);
 259
 260         if (i_size > 0) {
 261                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 262                 if (page->index < end_index)
 263                         return PAGE_CACHE_SIZE;
 264                 if (page->index == end_index)
 265                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 266         }
 267         return 0;
 268 }
 269
 270 /*
 271  * Determine the number of pages in an array of length 'len' and
 272  * with a base offset of 'base'
 273  */
 274 static inline
 275 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 276 {
 277         return ((unsigned long)len + (unsigned long)base +
 278                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 279 }
 280