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;
20 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
23 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
25 return ERR_PTR(-ENOENT);
30 extern struct svc_version nfs4_callback_version1;
33 extern int __init nfs_init_nfspagecache(void);
34 extern void nfs_destroy_nfspagecache(void);
35 extern int __init nfs_init_readpagecache(void);
36 extern void nfs_destroy_readpagecache(void);
37 extern int __init nfs_init_writepagecache(void);
38 extern void nfs_destroy_writepagecache(void);
40 #ifdef CONFIG_NFS_DIRECTIO
41 extern int __init nfs_init_directcache(void);
42 extern void nfs_destroy_directcache(void);
44 #define nfs_init_directcache() (0)
45 #define nfs_destroy_directcache() do {} while(0)
49 extern int nfs_stat_to_errno(int);
50 extern struct rpc_procinfo nfs_procedures[];
51 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
54 extern struct rpc_procinfo nfs3_procedures[];
55 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
59 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
64 extern struct rpc_procinfo nfs4_procedures[];
66 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
67 struct nfs4_fs_locations *fs_locations,
72 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
75 extern struct inode *nfs_alloc_inode(struct super_block *sb);
76 extern void nfs_destroy_inode(struct inode *);
77 extern int nfs_write_inode(struct inode *,int);
78 extern void nfs_clear_inode(struct inode *);
80 extern void nfs4_clear_inode(struct inode *);
84 extern struct file_system_type nfs_referral_nfs4_fs_type;
85 extern struct file_system_type clone_nfs_fs_type;
87 extern struct file_system_type clone_nfs4_fs_type;
90 extern struct rpc_stat nfs_rpcstat;
92 extern int __init register_nfs_fs(void);
93 extern void __exit unregister_nfs_fs(void);
96 extern char *nfs_path(const char *base, const struct dentry *dentry,
97 char *buffer, ssize_t buflen);
100 * Determine the mount path as a string
104 nfs4_path(const struct dentry *dentry, char *buffer, ssize_t buflen)
106 return nfs_path(NFS_SB(dentry->d_sb)->mnt_path, dentry, buffer, buflen);
111 * Determine the device name as a string
113 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
114 const struct dentry *dentry,
115 char *buffer, ssize_t buflen)
117 return nfs_path(mnt_parent->mnt_devname, dentry, buffer, buflen);
121 * Determine the actual block size (and log2 thereof)
124 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
126 /* make sure blocksize is a power of two */
127 if ((bsize & (bsize - 1)) || nrbitsp) {
128 unsigned char nrbits;
130 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
141 * Calculate the number of 512byte blocks used.
143 static inline unsigned long nfs_calc_block_size(u64 tsize)
145 loff_t used = (tsize + 511) >> 9;
146 return (used > ULONG_MAX) ? ULONG_MAX : used;
150 * Compute and set NFS server blocksize
153 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
155 if (bsize < NFS_MIN_FILE_IO_SIZE)
156 bsize = NFS_DEF_FILE_IO_SIZE;
157 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
158 bsize = NFS_MAX_FILE_IO_SIZE;
160 return nfs_block_bits(bsize, nrbitsp);
164 * Determine the maximum file size for a superblock
167 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
169 sb->s_maxbytes = (loff_t)maxfilesize;
170 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
171 sb->s_maxbytes = MAX_LFS_FILESIZE;
175 * Check if the string represents a "valid" IPv4 address
177 static inline int valid_ipaddr4(const char *buf)
179 int rc, count, in[4];
181 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
184 for (count = 0; count < 4; count++) {