2 * NFS internal definitions
5 #include <linux/mount.h>
7 struct nfs_clone_mount {
8 const struct super_block *sb;
9 const struct dentry *dentry;
11 struct nfs_fattr *fattr;
14 struct sockaddr_in *addr;
15 rpc_authflavor_t authflavor;
19 extern void nfs_put_client(struct nfs_client *);
20 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
21 extern struct nfs_client *nfs_get_client(const char *, const struct sockaddr_in *, int);
22 extern void nfs_mark_client_ready(struct nfs_client *, int);
23 extern int nfs_create_rpc_client(struct nfs_client *, int, unsigned int,
24 unsigned int, rpc_authflavor_t);
28 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
31 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
33 return ERR_PTR(-ENOENT);
38 extern struct svc_version nfs4_callback_version1;
41 extern int __init nfs_init_nfspagecache(void);
42 extern void nfs_destroy_nfspagecache(void);
43 extern int __init nfs_init_readpagecache(void);
44 extern void nfs_destroy_readpagecache(void);
45 extern int __init nfs_init_writepagecache(void);
46 extern void nfs_destroy_writepagecache(void);
48 #ifdef CONFIG_NFS_DIRECTIO
49 extern int __init nfs_init_directcache(void);
50 extern void nfs_destroy_directcache(void);
52 #define nfs_init_directcache() (0)
53 #define nfs_destroy_directcache() do {} while(0)
57 extern int nfs_stat_to_errno(int);
58 extern struct rpc_procinfo nfs_procedures[];
59 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
62 extern struct rpc_procinfo nfs3_procedures[];
63 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
67 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
72 extern struct rpc_procinfo nfs4_procedures[];
74 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
75 struct nfs4_fs_locations *fs_locations,
80 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
83 extern struct inode *nfs_alloc_inode(struct super_block *sb);
84 extern void nfs_destroy_inode(struct inode *);
85 extern int nfs_write_inode(struct inode *,int);
86 extern void nfs_clear_inode(struct inode *);
88 extern void nfs4_clear_inode(struct inode *);
92 extern struct file_system_type nfs_referral_nfs4_fs_type;
93 extern struct file_system_type clone_nfs_fs_type;
95 extern struct file_system_type clone_nfs4_fs_type;
98 extern struct rpc_stat nfs_rpcstat;
100 extern int __init register_nfs_fs(void);
101 extern void __exit unregister_nfs_fs(void);
104 extern char *nfs_path(const char *base, const struct dentry *dentry,
105 char *buffer, ssize_t buflen);
108 * Determine the mount path as a string
112 nfs4_path(const struct dentry *dentry, char *buffer, ssize_t buflen)
114 return nfs_path(NFS_SB(dentry->d_sb)->mnt_path, dentry, buffer, buflen);
119 * Determine the device name as a string
121 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
122 const struct dentry *dentry,
123 char *buffer, ssize_t buflen)
125 return nfs_path(mnt_parent->mnt_devname, dentry, buffer, buflen);
129 * Determine the actual block size (and log2 thereof)
132 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
134 /* make sure blocksize is a power of two */
135 if ((bsize & (bsize - 1)) || nrbitsp) {
136 unsigned char nrbits;
138 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
149 * Calculate the number of 512byte blocks used.
151 static inline unsigned long nfs_calc_block_size(u64 tsize)
153 loff_t used = (tsize + 511) >> 9;
154 return (used > ULONG_MAX) ? ULONG_MAX : used;
158 * Compute and set NFS server blocksize
161 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
163 if (bsize < NFS_MIN_FILE_IO_SIZE)
164 bsize = NFS_DEF_FILE_IO_SIZE;
165 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
166 bsize = NFS_MAX_FILE_IO_SIZE;
168 return nfs_block_bits(bsize, nrbitsp);
172 * Determine the maximum file size for a superblock
175 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
177 sb->s_maxbytes = (loff_t)maxfilesize;
178 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
179 sb->s_maxbytes = MAX_LFS_FILESIZE;
183 * Check if the string represents a "valid" IPv4 address
185 static inline int valid_ipaddr4(const char *buf)
187 int rc, count, in[4];
189 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
192 for (count = 0; count < 4; count++) {