/* * NFS internal definitions */ #include "nfs4_fs.h" #include <linux/mount.h> #include <linux/security.h> #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) struct nfs_string; /* Maximum number of readahead requests * FIXME: this should really be a sysctl so that users may tune it to suit * their needs. People that do NFS over a slow network, might for * instance want to reduce it to something closer to 1 for improved * interactive response. */ #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) /* * Determine if sessions are in use. */ static inline int nfs4_has_session(const struct nfs_client *clp) { #ifdef CONFIG_NFS_V4_1 if (clp->cl_session) return 1; #endif /* CONFIG_NFS_V4_1 */ return 0; } static inline int nfs4_has_persistent_session(const struct nfs_client *clp) { #ifdef CONFIG_NFS_V4_1 if (nfs4_has_session(clp)) return (clp->cl_session->flags & SESSION4_PERSIST); #endif /* CONFIG_NFS_V4_1 */ return 0; } static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) { if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; } static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) { if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) return 0; fattr->fileid = fattr->mounted_on_fileid; return 1; } struct nfs_clone_mount { const struct super_block *sb; const struct dentry *dentry; struct nfs_fh *fh; struct nfs_fattr *fattr; char *hostname; char *mnt_path; struct sockaddr *addr; size_t addrlen; rpc_authflavor_t authflavor; }; /* * Note: RFC 1813 doesn't limit the number of auth flavors that * a server can return, so make something up. */ #define NFS_MAX_SECFLAVORS (12) /* * Value used if the user did not specify a port value. */ #define NFS_UNSPEC_PORT (-1) /* * Maximum number of pages that readdir can use for creating * a vmapped array of pages. */ #define NFS_MAX_READDIR_PAGES 8 /* * In-kernel mount arguments */ struct nfs_parsed_mount_data { int flags; int rsize, wsize; int timeo, retrans; int acregmin, acregmax, acdirmin, acdirmax; int namlen; unsigned int options; unsigned int bsize; unsigned int auth_flavor_len; rpc_authflavor_t auth_flavors[1]; char *client_address; unsigned int version; unsigned int minorversion; char *fscache_uniq; struct { struct sockaddr_storage address; size_t addrlen; char *hostname; u32 version; int port; unsigned short protocol; } mount_server; struct { struct sockaddr_storage address; size_t addrlen; char *hostname; char *export_path; int port; unsigned short protocol; } nfs_server; struct security_mnt_opts lsm_opts; struct net *net; }; /* mount_clnt.c */ struct nfs_mount_request { struct sockaddr *sap; size_t salen; char *hostname; char *dirpath; u32 version; unsigned short protocol; struct nfs_fh *fh; int noresvport; unsigned int *auth_flav_len; rpc_authflavor_t *auth_flavs; struct net *net; }; extern int nfs_mount(struct nfs_mount_request *info); extern void nfs_umount(const struct nfs_mount_request *info); /* client.c */ extern const struct rpc_program nfs_program; extern void nfs_cleanup_cb_ident_idr(void); extern void nfs_put_client(struct nfs_client *); extern struct nfs_client *nfs4_find_client_ident(int); extern struct nfs_client * nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *); extern struct nfs_server *nfs_create_server( const struct nfs_parsed_mount_data *, struct nfs_fh *); extern struct nfs_server *nfs4_create_server( const struct nfs_parsed_mount_data *, struct nfs_fh *); extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, struct nfs_fh *); extern void nfs_free_server(struct nfs_server *server); extern struct nfs_server *nfs_clone_server(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *); extern void nfs_mark_client_ready(struct nfs_client *clp, int state); extern int nfs4_check_client_ready(struct nfs_client *clp); extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, const struct sockaddr *ds_addr, int ds_addrlen, int ds_proto); #ifdef CONFIG_PROC_FS extern int __init nfs_fs_proc_init(void); extern void nfs_fs_proc_exit(void); #else static inline int nfs_fs_proc_init(void) { return 0; } static inline void nfs_fs_proc_exit(void) { } #endif #ifdef CONFIG_NFS_V4 extern spinlock_t nfs_client_lock; extern struct list_head nfs_client_list; #endif /* nfs4namespace.c */ #ifdef CONFIG_NFS_V4 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry); #else static inline struct vfsmount *nfs_do_refmount(struct dentry *dentry) { return ERR_PTR(-ENOENT); } #endif /* callback_xdr.c */ extern struct svc_version nfs4_callback_version1; extern struct svc_version nfs4_callback_version4; /* pagelist.c */ extern int __init nfs_init_nfspagecache(void); extern void nfs_destroy_nfspagecache(void); extern int __init nfs_init_readpagecache(void); extern void nfs_destroy_readpagecache(void); extern int __init nfs_init_writepagecache(void); extern void nfs_destroy_writepagecache(void); extern int __init nfs_init_directcache(void); extern void nfs_destroy_directcache(void); /* nfs2xdr.c */ extern int nfs_stat_to_errno(enum nfs_stat); extern struct rpc_procinfo nfs_procedures[]; extern int nfs2_decode_dirent(struct xdr_stream *, struct nfs_entry *, int); /* nfs3xdr.c */ extern struct rpc_procinfo nfs3_procedures[]; extern int nfs3_decode_dirent(struct xdr_stream *, struct nfs_entry *, int); /* nfs4xdr.c */ #ifdef CONFIG_NFS_V4 extern int nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, int); #endif #ifdef CONFIG_NFS_V4_1 extern const u32 nfs41_maxread_overhead; extern const u32 nfs41_maxwrite_overhead; #endif /* nfs4proc.c */ #ifdef CONFIG_NFS_V4 extern struct rpc_procinfo nfs4_procedures[]; void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *); #endif extern int nfs4_init_ds_session(struct nfs_client *clp); /* proc.c */ void nfs_close_context(struct nfs_open_context *ctx, int is_sync); extern int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, const char *ip_addr, rpc_authflavor_t authflavour, int noresvport); /* dir.c */ extern int nfs_access_cache_shrinker(struct shrinker *shrink, struct shrink_control *sc); /* inode.c */ extern struct workqueue_struct *nfsiod_workqueue; extern struct inode *nfs_alloc_inode(struct super_block *sb); extern void nfs_destroy_inode(struct inode *); extern int nfs_write_inode(struct inode *, struct writeback_control *); extern void nfs_evict_inode(struct inode *); #ifdef CONFIG_NFS_V4 extern void nfs4_evict_inode(struct inode *); #endif void nfs_zap_acl_cache(struct inode *inode); extern int nfs_wait_bit_killable(void *word); /* super.c */ extern struct file_system_type nfs_xdev_fs_type; #ifdef CONFIG_NFS_V4 extern struct file_system_type nfs4_xdev_fs_type; extern struct file_system_type nfs4_referral_fs_type; #endif extern struct rpc_stat nfs_rpcstat; extern int __init register_nfs_fs(void); extern void __exit unregister_nfs_fs(void); extern void nfs_sb_active(struct super_block *sb); extern void nfs_sb_deactive(struct super_block *sb); /* namespace.c */ extern char *nfs_path(char **p, struct dentry *dentry, char *buffer, ssize_t buflen); extern struct vfsmount *nfs_d_automount(struct path *path); #ifdef CONFIG_NFS_V4 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *); #endif /* getroot.c */ extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, const char *); #ifdef CONFIG_NFS_V4 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, const char *); extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); #endif struct nfs_pageio_descriptor; /* read.c */ extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt, const struct rpc_call_ops *call_ops); extern void nfs_read_prepare(struct rpc_task *task, void *calldata); extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, struct list_head *head); extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio, struct inode *inode); extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); extern void nfs_readdata_release(struct nfs_read_data *rdata); /* write.c */ extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, struct list_head *head); extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags); extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); extern void nfs_writedata_release(struct nfs_write_data *wdata); extern void nfs_commit_free(struct nfs_write_data *p); extern int nfs_initiate_write(struct nfs_write_data *data, struct rpc_clnt *clnt, const struct rpc_call_ops *call_ops, int how); extern void nfs_write_prepare(struct rpc_task *task, void *calldata); extern int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt, const struct rpc_call_ops *call_ops, int how); extern void nfs_init_commit(struct nfs_write_data *data, struct list_head *head, struct pnfs_layout_segment *lseg); void nfs_retry_commit(struct list_head *page_list, struct pnfs_layout_segment *lseg); void nfs_commit_clear_lock(struct nfs_inode *nfsi); void nfs_commitdata_release(void *data); void nfs_commit_release_pages(struct nfs_write_data *data); #ifdef CONFIG_MIGRATION extern int nfs_migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); #else #define nfs_migrate_page NULL #endif /* nfs4proc.c */ extern void __nfs4_read_done_cb(struct nfs_read_data *); extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data); extern int nfs4_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, const char *ip_addr, rpc_authflavor_t authflavour, int noresvport); extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data); extern int _nfs4_call_sync(struct rpc_clnt *clnt, struct nfs_server *server, struct rpc_message *msg, struct nfs4_sequence_args *args, struct nfs4_sequence_res *res, int cache_reply); extern int _nfs4_call_sync_session(struct rpc_clnt *clnt, struct nfs_server *server, struct rpc_message *msg, struct nfs4_sequence_args *args, struct nfs4_sequence_res *res, int cache_reply); /* * Determine the device name as a string */ static inline char *nfs_devname(struct dentry *dentry, char *buffer, ssize_t buflen) { char *dummy; return nfs_path(&dummy, dentry, buffer, buflen); } /* * Determine the actual block size (and log2 thereof) */ static inline unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) { /* make sure blocksize is a power of two */ if ((bsize & (bsize - 1)) || nrbitsp) { unsigned char nrbits; for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) ; bsize = 1 << nrbits; if (nrbitsp) *nrbitsp = nrbits; } return bsize; } /* * Calculate the number of 512byte blocks used. */ static inline blkcnt_t nfs_calc_block_size(u64 tsize) { blkcnt_t used = (tsize + 511) >> 9; return (used > ULONG_MAX) ? ULONG_MAX : used; } /* * Compute and set NFS server blocksize */ static inline unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) { if (bsize < NFS_MIN_FILE_IO_SIZE) bsize = NFS_DEF_FILE_IO_SIZE; else if (bsize >= NFS_MAX_FILE_IO_SIZE) bsize = NFS_MAX_FILE_IO_SIZE; return nfs_block_bits(bsize, nrbitsp); } /* * Determine the maximum file size for a superblock */ static inline void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) { sb->s_maxbytes = (loff_t)maxfilesize; if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) sb->s_maxbytes = MAX_LFS_FILESIZE; } /* * Determine the number of bytes of data the page contains */ static inline unsigned int nfs_page_length(struct page *page) { loff_t i_size = i_size_read(page->mapping->host); if (i_size > 0) { pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; if (page->index < end_index) return PAGE_CACHE_SIZE; if (page->index == end_index) return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; } return 0; } /* * Convert a umode to a dirent->d_type */ static inline unsigned char nfs_umode_to_dtype(umode_t mode) { return (mode >> 12) & 15; } /* * Determine the number of pages in an array of length 'len' and * with a base offset of 'base' */ static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) { return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> PAGE_SHIFT; }