2 * NFS internal definitions
5 #include <linux/mount.h>
6 #include <linux/security.h>
8 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
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.
18 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
20 struct nfs_clone_mount {
21 const struct super_block *sb;
22 const struct dentry *dentry;
24 struct nfs_fattr *fattr;
27 struct sockaddr *addr;
29 rpc_authflavor_t authflavor;
33 * In-kernel mount arguments
35 struct nfs_parsed_mount_data {
39 int acregmin, acregmax,
44 unsigned int auth_flavor_len;
45 rpc_authflavor_t auth_flavors[1];
50 struct sockaddr_storage address;
55 unsigned short protocol;
59 struct sockaddr_storage address;
64 unsigned short protocol;
67 struct security_mnt_opts lsm_opts;
71 struct nfs_mount_request {
77 unsigned short protocol;
82 extern int nfs_mount(struct nfs_mount_request *info);
85 extern struct rpc_program nfs_program;
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 *,
93 extern struct nfs_server *nfs4_create_server(
94 const struct nfs_parsed_mount_data *,
96 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
98 extern void nfs_free_server(struct nfs_server *server);
99 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
102 #ifdef CONFIG_PROC_FS
103 extern int __init nfs_fs_proc_init(void);
104 extern void nfs_fs_proc_exit(void);
106 static inline int nfs_fs_proc_init(void)
110 static inline void nfs_fs_proc_exit(void)
115 /* nfs4namespace.c */
117 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
120 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
122 return ERR_PTR(-ENOENT);
127 extern struct svc_version nfs4_callback_version1;
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);
137 extern int __init nfs_init_directcache(void);
138 extern void nfs_destroy_directcache(void);
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);
146 extern struct rpc_procinfo nfs3_procedures[];
147 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
151 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
156 extern struct rpc_procinfo nfs4_procedures[];
160 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
163 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
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 *);
172 extern void nfs4_clear_inode(struct inode *);
174 void nfs_zap_acl_cache(struct inode *inode);
175 extern int nfs_wait_bit_killable(void *word);
178 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
179 extern struct file_system_type nfs_xdev_fs_type;
181 extern struct file_system_type nfs4_xdev_fs_type;
182 extern struct file_system_type nfs4_referral_fs_type;
185 extern struct rpc_stat nfs_rpcstat;
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);
193 extern char *nfs_path(const char *base,
194 const struct dentry *droot,
195 const struct dentry *dentry,
196 char *buffer, ssize_t buflen);
199 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
201 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
203 extern int nfs4_path_walk(struct nfs_server *server,
204 struct nfs_fh *mntfh,
209 * Determine the device name as a string
211 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
212 const struct dentry *dentry,
213 char *buffer, ssize_t buflen)
215 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
216 dentry, buffer, buflen);
220 * Determine the actual block size (and log2 thereof)
223 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
225 /* make sure blocksize is a power of two */
226 if ((bsize & (bsize - 1)) || nrbitsp) {
227 unsigned char nrbits;
229 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
240 * Calculate the number of 512byte blocks used.
242 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
244 blkcnt_t used = (tsize + 511) >> 9;
245 return (used > ULONG_MAX) ? ULONG_MAX : used;
249 * Compute and set NFS server blocksize
252 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
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;
259 return nfs_block_bits(bsize, nrbitsp);
263 * Determine the maximum file size for a superblock
266 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
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;
274 * Determine the number of bytes of data the page contains
277 unsigned int nfs_page_length(struct page *page)
279 loff_t i_size = i_size_read(page->mapping->host);
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;
292 * Determine the number of pages in an array of length 'len' and
293 * with a base offset of 'base'
296 unsigned int nfs_page_array_len(unsigned int base, size_t len)
298 return ((unsigned long)len + (unsigned long)base +
299 PAGE_SIZE - 1) >> PAGE_SHIFT;
302 #define IPV6_SCOPE_DELIMITER '%'
305 * Set the port number in an address. Be agnostic about the address
308 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
310 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
311 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
313 switch (sap->sa_family) {
315 ap->sin_port = htons(port);
318 ap6->sin6_port = htons(port);