246 lines
6.3 KiB
C
246 lines
6.3 KiB
C
/*
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* NFS internal definitions
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*/
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#include <linux/mount.h>
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struct nfs_string;
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struct nfs_mount_data;
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struct nfs4_mount_data;
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/* Maximum number of readahead requests
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* FIXME: this should really be a sysctl so that users may tune it to suit
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* their needs. People that do NFS over a slow network, might for
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* instance want to reduce it to something closer to 1 for improved
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* interactive response.
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*/
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#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
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struct nfs_clone_mount {
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const struct super_block *sb;
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const struct dentry *dentry;
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struct nfs_fh *fh;
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struct nfs_fattr *fattr;
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char *hostname;
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char *mnt_path;
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struct sockaddr_in *addr;
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rpc_authflavor_t authflavor;
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};
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/* client.c */
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extern struct rpc_program nfs_program;
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extern void nfs_put_client(struct nfs_client *);
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extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
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extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
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struct nfs_fh *);
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extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
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const char *,
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const struct sockaddr_in *,
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const char *,
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const char *,
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rpc_authflavor_t,
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struct nfs_fh *);
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extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
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struct nfs_fh *);
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extern void nfs_free_server(struct nfs_server *server);
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extern struct nfs_server *nfs_clone_server(struct nfs_server *,
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struct nfs_fh *,
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struct nfs_fattr *);
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#ifdef CONFIG_PROC_FS
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extern int __init nfs_fs_proc_init(void);
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extern void nfs_fs_proc_exit(void);
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#else
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static inline int nfs_fs_proc_init(void)
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{
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return 0;
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}
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static inline void nfs_fs_proc_exit(void)
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{
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}
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#endif
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/* nfs4namespace.c */
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#ifdef CONFIG_NFS_V4
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extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
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#else
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static inline
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struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
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{
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return ERR_PTR(-ENOENT);
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}
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#endif
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/* callback_xdr.c */
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extern struct svc_version nfs4_callback_version1;
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/* pagelist.c */
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extern int __init nfs_init_nfspagecache(void);
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extern void nfs_destroy_nfspagecache(void);
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extern int __init nfs_init_readpagecache(void);
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extern void nfs_destroy_readpagecache(void);
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extern int __init nfs_init_writepagecache(void);
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extern void nfs_destroy_writepagecache(void);
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#ifdef CONFIG_NFS_DIRECTIO
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extern int __init nfs_init_directcache(void);
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extern void nfs_destroy_directcache(void);
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#else
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#define nfs_init_directcache() (0)
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#define nfs_destroy_directcache() do {} while(0)
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#endif
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/* nfs2xdr.c */
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extern int nfs_stat_to_errno(int);
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extern struct rpc_procinfo nfs_procedures[];
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extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
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/* nfs3xdr.c */
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extern struct rpc_procinfo nfs3_procedures[];
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extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
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/* nfs4xdr.c */
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#ifdef CONFIG_NFS_V4
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extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
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#endif
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/* nfs4proc.c */
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#ifdef CONFIG_NFS_V4
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extern struct rpc_procinfo nfs4_procedures[];
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#endif
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/* dir.c */
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extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
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/* inode.c */
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extern struct inode *nfs_alloc_inode(struct super_block *sb);
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extern void nfs_destroy_inode(struct inode *);
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extern int nfs_write_inode(struct inode *,int);
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extern void nfs_clear_inode(struct inode *);
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#ifdef CONFIG_NFS_V4
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extern void nfs4_clear_inode(struct inode *);
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#endif
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/* super.c */
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extern struct file_system_type nfs_xdev_fs_type;
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#ifdef CONFIG_NFS_V4
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extern struct file_system_type nfs4_xdev_fs_type;
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extern struct file_system_type nfs4_referral_fs_type;
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#endif
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extern struct rpc_stat nfs_rpcstat;
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extern int __init register_nfs_fs(void);
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extern void __exit unregister_nfs_fs(void);
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/* namespace.c */
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extern char *nfs_path(const char *base,
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const struct dentry *droot,
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const struct dentry *dentry,
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char *buffer, ssize_t buflen);
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/* getroot.c */
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extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
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#ifdef CONFIG_NFS_V4
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extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
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extern int nfs4_path_walk(struct nfs_server *server,
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struct nfs_fh *mntfh,
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const char *path);
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#endif
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/*
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* Determine the device name as a string
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*/
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static inline char *nfs_devname(const struct vfsmount *mnt_parent,
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const struct dentry *dentry,
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char *buffer, ssize_t buflen)
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{
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return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
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dentry, buffer, buflen);
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}
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/*
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* Determine the actual block size (and log2 thereof)
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*/
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static inline
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unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
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{
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/* make sure blocksize is a power of two */
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if ((bsize & (bsize - 1)) || nrbitsp) {
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unsigned char nrbits;
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for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
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;
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bsize = 1 << nrbits;
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if (nrbitsp)
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*nrbitsp = nrbits;
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}
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return bsize;
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}
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/*
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* Calculate the number of 512byte blocks used.
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*/
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static inline unsigned long nfs_calc_block_size(u64 tsize)
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{
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loff_t used = (tsize + 511) >> 9;
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return (used > ULONG_MAX) ? ULONG_MAX : used;
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}
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/*
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* Compute and set NFS server blocksize
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*/
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static inline
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unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
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{
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if (bsize < NFS_MIN_FILE_IO_SIZE)
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bsize = NFS_DEF_FILE_IO_SIZE;
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else if (bsize >= NFS_MAX_FILE_IO_SIZE)
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bsize = NFS_MAX_FILE_IO_SIZE;
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return nfs_block_bits(bsize, nrbitsp);
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}
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/*
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* Determine the maximum file size for a superblock
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*/
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static inline
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void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
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{
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sb->s_maxbytes = (loff_t)maxfilesize;
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if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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}
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/*
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* Determine the number of bytes of data the page contains
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*/
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static inline
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unsigned int nfs_page_length(struct page *page)
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{
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loff_t i_size = i_size_read(page->mapping->host);
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if (i_size > 0) {
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pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
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if (page->index < end_index)
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return PAGE_CACHE_SIZE;
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if (page->index == end_index)
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return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
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}
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return 0;
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}
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/*
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* Determine the number of pages in an array of length 'len' and
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* with a base offset of 'base'
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*/
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static inline
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unsigned int nfs_page_array_len(unsigned int base, size_t len)
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{
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return ((unsigned long)len + (unsigned long)base +
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PAGE_SIZE - 1) >> PAGE_SHIFT;
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}
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