2 * NFS internal definitions
5 #include <linux/mount.h>
6 #include <linux/security.h>
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.
16 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
18 struct nfs_clone_mount {
19 const struct super_block *sb;
20 const struct dentry *dentry;
22 struct nfs_fattr *fattr;
25 struct sockaddr *addr;
27 rpc_authflavor_t authflavor;
31 * In-kernel mount arguments
33 struct nfs_parsed_mount_data {
37 int acregmin, acregmax,
41 unsigned int auth_flavor_len;
42 rpc_authflavor_t auth_flavors[1];
46 struct sockaddr_storage address;
51 unsigned short protocol;
55 struct sockaddr_storage address;
60 unsigned short protocol;
63 struct security_mnt_opts lsm_opts;
67 extern struct rpc_program nfs_program;
69 extern void nfs_put_client(struct nfs_client *);
70 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
71 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
72 extern struct nfs_server *nfs_create_server(
73 const struct nfs_parsed_mount_data *,
75 extern struct nfs_server *nfs4_create_server(
76 const struct nfs_parsed_mount_data *,
78 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
80 extern void nfs_free_server(struct nfs_server *server);
81 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
85 extern int __init nfs_fs_proc_init(void);
86 extern void nfs_fs_proc_exit(void);
88 static inline int nfs_fs_proc_init(void)
92 static inline void nfs_fs_proc_exit(void)
99 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
102 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
104 return ERR_PTR(-ENOENT);
109 extern struct svc_version nfs4_callback_version1;
112 extern int __init nfs_init_nfspagecache(void);
113 extern void nfs_destroy_nfspagecache(void);
114 extern int __init nfs_init_readpagecache(void);
115 extern void nfs_destroy_readpagecache(void);
116 extern int __init nfs_init_writepagecache(void);
117 extern void nfs_destroy_writepagecache(void);
119 #ifdef CONFIG_NFS_DIRECTIO
120 extern int __init nfs_init_directcache(void);
121 extern void nfs_destroy_directcache(void);
123 #define nfs_init_directcache() (0)
124 #define nfs_destroy_directcache() do {} while(0)
128 extern int nfs_stat_to_errno(int);
129 extern struct rpc_procinfo nfs_procedures[];
130 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
133 extern struct rpc_procinfo nfs3_procedures[];
134 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
138 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
143 extern struct rpc_procinfo nfs4_procedures[];
147 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
150 extern struct workqueue_struct *nfsiod_workqueue;
151 extern struct inode *nfs_alloc_inode(struct super_block *sb);
152 extern void nfs_destroy_inode(struct inode *);
153 extern int nfs_write_inode(struct inode *,int);
154 extern void nfs_clear_inode(struct inode *);
156 extern void nfs4_clear_inode(struct inode *);
160 extern struct file_system_type nfs_xdev_fs_type;
162 extern struct file_system_type nfs4_xdev_fs_type;
163 extern struct file_system_type nfs4_referral_fs_type;
166 extern struct rpc_stat nfs_rpcstat;
168 extern int __init register_nfs_fs(void);
169 extern void __exit unregister_nfs_fs(void);
170 extern void nfs_sb_active(struct nfs_server *server);
171 extern void nfs_sb_deactive(struct nfs_server *server);
174 extern char *nfs_path(const char *base,
175 const struct dentry *droot,
176 const struct dentry *dentry,
177 char *buffer, ssize_t buflen);
180 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
182 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
184 extern int nfs4_path_walk(struct nfs_server *server,
185 struct nfs_fh *mntfh,
190 * Determine the device name as a string
192 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
193 const struct dentry *dentry,
194 char *buffer, ssize_t buflen)
196 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
197 dentry, buffer, buflen);
201 * Determine the actual block size (and log2 thereof)
204 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
206 /* make sure blocksize is a power of two */
207 if ((bsize & (bsize - 1)) || nrbitsp) {
208 unsigned char nrbits;
210 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
221 * Calculate the number of 512byte blocks used.
223 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
225 blkcnt_t used = (tsize + 511) >> 9;
226 return (used > ULONG_MAX) ? ULONG_MAX : used;
230 * Compute and set NFS server blocksize
233 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
235 if (bsize < NFS_MIN_FILE_IO_SIZE)
236 bsize = NFS_DEF_FILE_IO_SIZE;
237 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
238 bsize = NFS_MAX_FILE_IO_SIZE;
240 return nfs_block_bits(bsize, nrbitsp);
244 * Determine the maximum file size for a superblock
247 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
249 sb->s_maxbytes = (loff_t)maxfilesize;
250 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
251 sb->s_maxbytes = MAX_LFS_FILESIZE;
255 * Determine the number of bytes of data the page contains
258 unsigned int nfs_page_length(struct page *page)
260 loff_t i_size = i_size_read(page->mapping->host);
263 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
264 if (page->index < end_index)
265 return PAGE_CACHE_SIZE;
266 if (page->index == end_index)
267 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
273 * Determine the number of pages in an array of length 'len' and
274 * with a base offset of 'base'
277 unsigned int nfs_page_array_len(unsigned int base, size_t len)
279 return ((unsigned long)len + (unsigned long)base +
280 PAGE_SIZE - 1) >> PAGE_SHIFT;