fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include <linux/mount.h>
   6 #include <linux/security.h>
   7
   8 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
   9
  10 struct nfs_string;
  11
  12 /* Maximum number of readahead requests
  13  * FIXME: this should really be a sysctl so that users may tune it to suit
  14  *        their needs. People that do NFS over a slow network, might for
  15  *        instance want to reduce it to something closer to 1 for improved
  16  *        interactive response.
  17  */
  18 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  19
  20 struct nfs_clone_mount {
  21         const struct super_block *sb;
  22         const struct dentry *dentry;
  23         struct nfs_fh *fh;
  24         struct nfs_fattr *fattr;
  25         char *hostname;
  26         char *mnt_path;
  27         struct sockaddr *addr;
  28         size_t addrlen;
  29         rpc_authflavor_t authflavor;
  30 };
  31
  32 /*
  33  * In-kernel mount arguments
  34  */
  35 struct nfs_parsed_mount_data {
  36         int                     flags;
  37         int                     rsize, wsize;
  38         int                     timeo, retrans;
  39         int                     acregmin, acregmax,
  40                                 acdirmin, acdirmax;
  41         int                     namlen;
  42         unsigned int            options;
  43         unsigned int            bsize;
  44         unsigned int            auth_flavor_len;
  45         rpc_authflavor_t        auth_flavors[1];
  46         char                    *client_address;
  47         char                    *fscache_uniq;
  48
  49         struct {
  50                 struct sockaddr_storage address;
  51                 size_t                  addrlen;
  52                 char                    *hostname;
  53                 u32                     version;
  54                 unsigned short          port;
  55                 unsigned short          protocol;
  56         } mount_server;
  57
  58         struct {
  59                 struct sockaddr_storage address;
  60                 size_t                  addrlen;
  61                 char                    *hostname;
  62                 char                    *export_path;
  63                 unsigned short          port;
  64                 unsigned short          protocol;
  65         } nfs_server;
  66
  67         struct security_mnt_opts lsm_opts;
  68 };
  69
  70 /* mount_clnt.c */
  71 struct nfs_mount_request {
  72         struct sockaddr         *sap;
  73         size_t                  salen;
  74         char                    *hostname;
  75         char                    *dirpath;
  76         u32                     version;
  77         unsigned short          protocol;
  78         struct nfs_fh           *fh;
  79         int                     noresvport;
  80 };
  81
  82 extern int nfs_mount(struct nfs_mount_request *info);
  83
  84 /* client.c */
  85 extern struct rpc_program nfs_program;
  86
  87 extern void nfs_put_client(struct nfs_client *);
  88 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
  89 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
  90 extern struct nfs_server *nfs_create_server(
  91                                         const struct nfs_parsed_mount_data *,
  92                                         struct nfs_fh *);
  93 extern struct nfs_server *nfs4_create_server(
  94                                         const struct nfs_parsed_mount_data *,
  95                                         struct nfs_fh *);
  96 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
  97                                                       struct nfs_fh *);
  98 extern void nfs_free_server(struct nfs_server *server);
  99 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 100                                            struct nfs_fh *,
 101                                            struct nfs_fattr *);
 102 #ifdef CONFIG_PROC_FS
 103 extern int __init nfs_fs_proc_init(void);
 104 extern void nfs_fs_proc_exit(void);
 105 #else
 106 static inline int nfs_fs_proc_init(void)
 107 {
 108         return 0;
 109 }
 110 static inline void nfs_fs_proc_exit(void)
 111 {
 112 }
 113 #endif
 114
 115 /* nfs4namespace.c */
 116 #ifdef CONFIG_NFS_V4
 117 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
 118 #else
 119 static inline
 120 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
 121 {
 122         return ERR_PTR(-ENOENT);
 123 }
 124 #endif
 125
 126 /* callback_xdr.c */
 127 extern struct svc_version nfs4_callback_version1;
 128
 129 /* pagelist.c */
 130 extern int __init nfs_init_nfspagecache(void);
 131 extern void nfs_destroy_nfspagecache(void);
 132 extern int __init nfs_init_readpagecache(void);
 133 extern void nfs_destroy_readpagecache(void);
 134 extern int __init nfs_init_writepagecache(void);
 135 extern void nfs_destroy_writepagecache(void);
 136
 137 extern int __init nfs_init_directcache(void);
 138 extern void nfs_destroy_directcache(void);
 139
 140 /* nfs2xdr.c */
 141 extern int nfs_stat_to_errno(int);
 142 extern struct rpc_procinfo nfs_procedures[];
 143 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
 144
 145 /* nfs3xdr.c */
 146 extern struct rpc_procinfo nfs3_procedures[];
 147 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
 148
 149 /* nfs4xdr.c */
 150 #ifdef CONFIG_NFS_V4
 151 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 152 #endif
 153
 154 /* nfs4proc.c */
 155 #ifdef CONFIG_NFS_V4
 156 extern struct rpc_procinfo nfs4_procedures[];
 157 #endif
 158
 159 /* proc.c */
 160 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 161
 162 /* dir.c */
 163 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
 164
 165 /* inode.c */
 166 extern struct workqueue_struct *nfsiod_workqueue;
 167 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 168 extern void nfs_destroy_inode(struct inode *);
 169 extern int nfs_write_inode(struct inode *,int);
 170 extern void nfs_clear_inode(struct inode *);
 171 #ifdef CONFIG_NFS_V4
 172 extern void nfs4_clear_inode(struct inode *);
 173 #endif
 174 void nfs_zap_acl_cache(struct inode *inode);
 175 extern int nfs_wait_bit_killable(void *word);
 176
 177 /* super.c */
 178 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
 179 extern struct file_system_type nfs_xdev_fs_type;
 180 #ifdef CONFIG_NFS_V4
 181 extern struct file_system_type nfs4_xdev_fs_type;
 182 extern struct file_system_type nfs4_referral_fs_type;
 183 #endif
 184
 185 extern struct rpc_stat nfs_rpcstat;
 186
 187 extern int __init register_nfs_fs(void);
 188 extern void __exit unregister_nfs_fs(void);
 189 extern void nfs_sb_active(struct super_block *sb);
 190 extern void nfs_sb_deactive(struct super_block *sb);
 191
 192 /* namespace.c */
 193 extern char *nfs_path(const char *base,
 194                       const struct dentry *droot,
 195                       const struct dentry *dentry,
 196                       char *buffer, ssize_t buflen);
 197
 198 /* getroot.c */
 199 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 200 #ifdef CONFIG_NFS_V4
 201 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 202
 203 extern int nfs4_path_walk(struct nfs_server *server,
 204                           struct nfs_fh *mntfh,
 205                           const char *path);
 206 #endif
 207
 208 /*
 209  * Determine the device name as a string
 210  */
 211 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 212                                 const struct dentry *dentry,
 213                                 char *buffer, ssize_t buflen)
 214 {
 215         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 216                         dentry, buffer, buflen);
 217 }
 218
 219 /*
 220  * Determine the actual block size (and log2 thereof)
 221  */
 222 static inline
 223 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 224 {
 225         /* make sure blocksize is a power of two */
 226         if ((bsize & (bsize - 1)) || nrbitsp) {
 227                 unsigned char   nrbits;
 228
 229                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 230                         ;
 231                 bsize = 1 << nrbits;
 232                 if (nrbitsp)
 233                         *nrbitsp = nrbits;
 234         }
 235
 236         return bsize;
 237 }
 238
 239 /*
 240  * Calculate the number of 512byte blocks used.
 241  */
 242 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 243 {
 244         blkcnt_t used = (tsize + 511) >> 9;
 245         return (used > ULONG_MAX) ? ULONG_MAX : used;
 246 }
 247
 248 /*
 249  * Compute and set NFS server blocksize
 250  */
 251 static inline
 252 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 253 {
 254         if (bsize < NFS_MIN_FILE_IO_SIZE)
 255                 bsize = NFS_DEF_FILE_IO_SIZE;
 256         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 257                 bsize = NFS_MAX_FILE_IO_SIZE;
 258
 259         return nfs_block_bits(bsize, nrbitsp);
 260 }
 261
 262 /*
 263  * Determine the maximum file size for a superblock
 264  */
 265 static inline
 266 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 267 {
 268         sb->s_maxbytes = (loff_t)maxfilesize;
 269         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 270                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 271 }
 272
 273 /*
 274  * Determine the number of bytes of data the page contains
 275  */
 276 static inline
 277 unsigned int nfs_page_length(struct page *page)
 278 {
 279         loff_t i_size = i_size_read(page->mapping->host);
 280
 281         if (i_size > 0) {
 282                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 283                 if (page->index < end_index)
 284                         return PAGE_CACHE_SIZE;
 285                 if (page->index == end_index)
 286                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 287         }
 288         return 0;
 289 }
 290
 291 /*
 292  * Determine the number of pages in an array of length 'len' and
 293  * with a base offset of 'base'
 294  */
 295 static inline
 296 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 297 {
 298         return ((unsigned long)len + (unsigned long)base +
 299                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 300 }
 301
 302 #define IPV6_SCOPE_DELIMITER    '%'
 303
 304 /*
 305  * Set the port number in an address.  Be agnostic about the address
 306  * family.
 307  */
 308 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
 309 {
 310         struct sockaddr_in *ap = (struct sockaddr_in *)sap;
 311         struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
 312
 313         switch (sap->sa_family) {
 314         case AF_INET:
 315                 ap->sin_port = htons(port);
 316                 break;
 317         case AF_INET6:
 318                 ap6->sin6_port = htons(port);
 319                 break;
 320         }
 321 }