2 * NFS internal definitions
5 #include <linux/mount.h>
9 /* Maximum number of readahead requests
10 * FIXME: this should really be a sysctl so that users may tune it to suit
11 * their needs. People that do NFS over a slow network, might for
12 * instance want to reduce it to something closer to 1 for improved
13 * interactive response.
15 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
17 struct nfs_clone_mount {
18 const struct super_block *sb;
19 const struct dentry *dentry;
21 struct nfs_fattr *fattr;
24 struct sockaddr *addr;
26 rpc_authflavor_t authflavor;
30 * In-kernel mount arguments
32 struct nfs_parsed_mount_data {
36 int acregmin, acregmax,
40 unsigned int auth_flavor_len;
41 rpc_authflavor_t auth_flavors[1];
45 struct sockaddr_storage address;
54 struct sockaddr_storage address;
63 extern struct rpc_program nfs_program;
65 extern void nfs_put_client(struct nfs_client *);
66 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
67 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
68 extern struct nfs_server *nfs_create_server(
69 const struct nfs_parsed_mount_data *,
71 extern struct nfs_server *nfs4_create_server(
72 const struct nfs_parsed_mount_data *,
74 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
76 extern void nfs_free_server(struct nfs_server *server);
77 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
81 extern int __init nfs_fs_proc_init(void);
82 extern void nfs_fs_proc_exit(void);
84 static inline int nfs_fs_proc_init(void)
88 static inline void nfs_fs_proc_exit(void)
95 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
98 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
100 return ERR_PTR(-ENOENT);
105 extern struct svc_version nfs4_callback_version1;
108 extern int __init nfs_init_nfspagecache(void);
109 extern void nfs_destroy_nfspagecache(void);
110 extern int __init nfs_init_readpagecache(void);
111 extern void nfs_destroy_readpagecache(void);
112 extern int __init nfs_init_writepagecache(void);
113 extern void nfs_destroy_writepagecache(void);
115 #ifdef CONFIG_NFS_DIRECTIO
116 extern int __init nfs_init_directcache(void);
117 extern void nfs_destroy_directcache(void);
119 #define nfs_init_directcache() (0)
120 #define nfs_destroy_directcache() do {} while(0)
124 extern int nfs_stat_to_errno(int);
125 extern struct rpc_procinfo nfs_procedures[];
126 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
129 extern struct rpc_procinfo nfs3_procedures[];
130 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
134 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
139 extern struct rpc_procinfo nfs4_procedures[];
143 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
146 extern struct workqueue_struct *nfsiod_workqueue;
147 extern struct inode *nfs_alloc_inode(struct super_block *sb);
148 extern void nfs_destroy_inode(struct inode *);
149 extern int nfs_write_inode(struct inode *,int);
150 extern void nfs_clear_inode(struct inode *);
152 extern void nfs4_clear_inode(struct inode *);
156 extern struct file_system_type nfs_xdev_fs_type;
158 extern struct file_system_type nfs4_xdev_fs_type;
159 extern struct file_system_type nfs4_referral_fs_type;
162 extern struct rpc_stat nfs_rpcstat;
164 extern int __init register_nfs_fs(void);
165 extern void __exit unregister_nfs_fs(void);
166 extern void nfs_sb_active(struct nfs_server *server);
167 extern void nfs_sb_deactive(struct nfs_server *server);
170 extern char *nfs_path(const char *base,
171 const struct dentry *droot,
172 const struct dentry *dentry,
173 char *buffer, ssize_t buflen);
176 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
178 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
180 extern int nfs4_path_walk(struct nfs_server *server,
181 struct nfs_fh *mntfh,
186 * Determine the device name as a string
188 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
189 const struct dentry *dentry,
190 char *buffer, ssize_t buflen)
192 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
193 dentry, buffer, buflen);
197 * Determine the actual block size (and log2 thereof)
200 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
202 /* make sure blocksize is a power of two */
203 if ((bsize & (bsize - 1)) || nrbitsp) {
204 unsigned char nrbits;
206 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
217 * Calculate the number of 512byte blocks used.
219 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
221 blkcnt_t used = (tsize + 511) >> 9;
222 return (used > ULONG_MAX) ? ULONG_MAX : used;
226 * Compute and set NFS server blocksize
229 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
231 if (bsize < NFS_MIN_FILE_IO_SIZE)
232 bsize = NFS_DEF_FILE_IO_SIZE;
233 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
234 bsize = NFS_MAX_FILE_IO_SIZE;
236 return nfs_block_bits(bsize, nrbitsp);
240 * Determine the maximum file size for a superblock
243 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
245 sb->s_maxbytes = (loff_t)maxfilesize;
246 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
247 sb->s_maxbytes = MAX_LFS_FILESIZE;
251 * Determine the number of bytes of data the page contains
254 unsigned int nfs_page_length(struct page *page)
256 loff_t i_size = i_size_read(page->mapping->host);
259 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
260 if (page->index < end_index)
261 return PAGE_CACHE_SIZE;
262 if (page->index == end_index)
263 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
269 * Determine the number of pages in an array of length 'len' and
270 * with a base offset of 'base'
273 unsigned int nfs_page_array_len(unsigned int base, size_t len)
275 return ((unsigned long)len + (unsigned long)base +
276 PAGE_SIZE - 1) >> PAGE_SHIFT;