2 * NFS internal definitions
5 #include <linux/mount.h>
7 #define NFS_PAGE_WRITING 0
8 #define NFS_PAGE_CACHED 1
10 #define PageNfsBit(bit, page) test_bit(bit, &(page)->private)
12 #define SetPageNfsBit(bit, page) \
14 SetPagePrivate((page)); \
15 set_bit(bit, &(page)->private); \
18 #define ClearPageNfsBit(bit, page) \
20 clear_bit(bit, &(page)->private); \
23 #define PageNfsWriting(page) PageNfsBit(NFS_PAGE_WRITING, (page))
24 #define SetPageNfsWriting(page) SetPageNfsBit(NFS_PAGE_WRITING, (page))
25 #define ClearPageNfsWriting(page) ClearPageNfsBit(NFS_PAGE_WRITING, (page))
27 #define PageNfsCached(page) PageNfsBit(NFS_PAGE_CACHED, (page))
28 #define SetPageNfsCached(page) SetPageNfsBit(NFS_PAGE_CACHED, (page))
29 #define ClearPageNfsCached(page) ClearPageNfsBit(NFS_PAGE_CACHED, (page))
32 struct nfs_mount_data;
33 struct nfs4_mount_data;
35 /* Maximum number of readahead requests
36 * FIXME: this should really be a sysctl so that users may tune it to suit
37 * their needs. People that do NFS over a slow network, might for
38 * instance want to reduce it to something closer to 1 for improved
39 * interactive response.
41 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
43 struct nfs_clone_mount {
44 const struct super_block *sb;
45 const struct dentry *dentry;
47 struct nfs_fattr *fattr;
50 struct sockaddr_in *addr;
51 rpc_authflavor_t authflavor;
55 * include filesystem caching stuff here
60 extern struct rpc_program nfs_program;
62 extern void nfs_put_client(struct nfs_client *);
63 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
64 extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
66 extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
68 const struct sockaddr_in *,
73 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
75 extern void nfs_free_server(struct nfs_server *server);
76 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
80 extern int __init nfs_fs_proc_init(void);
81 extern void nfs_fs_proc_exit(void);
83 static inline int nfs_fs_proc_init(void)
87 static inline void nfs_fs_proc_exit(void)
94 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
97 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
99 return ERR_PTR(-ENOENT);
104 extern struct svc_version nfs4_callback_version1;
107 extern int __init nfs_init_nfspagecache(void);
108 extern void nfs_destroy_nfspagecache(void);
109 extern int __init nfs_init_readpagecache(void);
110 extern void nfs_destroy_readpagecache(void);
111 extern int __init nfs_init_writepagecache(void);
112 extern void nfs_destroy_writepagecache(void);
114 #ifdef CONFIG_NFS_DIRECTIO
115 extern int __init nfs_init_directcache(void);
116 extern void nfs_destroy_directcache(void);
118 #define nfs_init_directcache() (0)
119 #define nfs_destroy_directcache() do {} while(0)
123 extern int nfs_stat_to_errno(int);
124 extern struct rpc_procinfo nfs_procedures[];
125 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
128 extern struct rpc_procinfo nfs3_procedures[];
129 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
133 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
138 extern struct rpc_procinfo nfs4_procedures[];
140 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
141 struct nfs4_fs_locations *fs_locations,
146 extern struct inode *nfs_alloc_inode(struct super_block *sb);
147 extern void nfs_destroy_inode(struct inode *);
148 extern int nfs_write_inode(struct inode *,int);
149 extern void nfs_clear_inode(struct inode *);
151 extern void nfs4_clear_inode(struct inode *);
155 extern struct file_system_type nfs_xdev_fs_type;
157 extern struct file_system_type nfs4_xdev_fs_type;
158 extern struct file_system_type nfs4_referral_fs_type;
161 extern struct rpc_stat nfs_rpcstat;
163 extern int __init register_nfs_fs(void);
164 extern void __exit unregister_nfs_fs(void);
167 extern char *nfs_path(const char *base,
168 const struct dentry *droot,
169 const struct dentry *dentry,
170 char *buffer, ssize_t buflen);
173 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
175 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
177 extern int nfs4_path_walk(struct nfs_server *server,
178 struct nfs_fh *mntfh,
183 extern int nfs_readpage_async(struct nfs_open_context *, struct inode *, struct page *);
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 unsigned long nfs_calc_block_size(u64 tsize)
221 loff_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;