diff options
Diffstat (limited to 'kernel/fs/nfs/internal.h')
| -rw-r--r-- | kernel/fs/nfs/internal.h | 683 |
1 files changed, 683 insertions, 0 deletions
diff --git a/kernel/fs/nfs/internal.h b/kernel/fs/nfs/internal.h new file mode 100644 index 000000000..9e6475bc5 --- /dev/null +++ b/kernel/fs/nfs/internal.h @@ -0,0 +1,683 @@ +/* + * NFS internal definitions + */ + +#include "nfs4_fs.h" +#include <linux/mount.h> +#include <linux/security.h> +#include <linux/crc32.h> +#include <linux/nfs_page.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) + +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; + 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 + +struct nfs_client_initdata { + unsigned long init_flags; + const char *hostname; + const struct sockaddr *addr; + size_t addrlen; + struct nfs_subversion *nfs_mod; + int proto; + u32 minorversion; + struct net *net; +}; + +/* + * In-kernel mount arguments + */ +struct nfs_parsed_mount_data { + int flags; + unsigned int rsize, wsize; + unsigned int timeo, retrans; + unsigned int acregmin, acregmax, + acdirmin, acdirmax; + unsigned int namlen; + unsigned int options; + unsigned int bsize; + struct nfs_auth_info auth_info; + rpc_authflavor_t selected_flavor; + char *client_address; + unsigned int version; + unsigned int minorversion; + char *fscache_uniq; + bool need_mount; + + 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; +}; + +struct nfs_mount_info { + void (*fill_super)(struct super_block *, struct nfs_mount_info *); + int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); + struct nfs_parsed_mount_data *parsed; + struct nfs_clone_mount *cloned; + struct nfs_fh *mntfh; +}; + +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_clients_init(struct net *net); +extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); +int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t); +struct nfs_client *nfs_get_client(const struct nfs_client_initdata *, + const struct rpc_timeout *, const char *, + rpc_authflavor_t); +int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); +void nfs_server_insert_lists(struct nfs_server *); +void nfs_server_remove_lists(struct nfs_server *); +void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int); +int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, + rpc_authflavor_t); +struct nfs_server *nfs_alloc_server(void); +void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); + +extern void nfs_cleanup_cb_ident_idr(struct net *); +extern void nfs_put_client(struct nfs_client *); +extern void nfs_free_client(struct nfs_client *); +extern struct nfs_client *nfs4_find_client_ident(struct net *, int); +extern struct nfs_client * +nfs4_find_client_sessionid(struct net *, const struct sockaddr *, + struct nfs4_sessionid *, u32); +extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, + struct nfs_subversion *); +extern struct nfs_server *nfs4_create_server( + struct nfs_mount_info *, + struct nfs_subversion *); +extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, + struct nfs_fh *); +extern int nfs4_update_server(struct nfs_server *server, const char *hostname, + struct sockaddr *sap, size_t salen, + struct net *net); +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 *, + rpc_authflavor_t); +extern int nfs_wait_client_init_complete(const struct nfs_client *clp); +extern void nfs_mark_client_ready(struct nfs_client *clp, int state); +extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, + const struct sockaddr *ds_addr, + int ds_addrlen, int ds_proto, + unsigned int ds_timeo, + unsigned int ds_retrans, + u32 minor_version, + rpc_authflavor_t au_flavor); +extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, + struct inode *); +extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp, + const struct sockaddr *ds_addr, int ds_addrlen, + int ds_proto, unsigned int ds_timeo, + unsigned int ds_retrans, rpc_authflavor_t au_flavor); +#ifdef CONFIG_PROC_FS +extern int __init nfs_fs_proc_init(void); +extern void nfs_fs_proc_exit(void); +extern int nfs_fs_proc_net_init(struct net *net); +extern void nfs_fs_proc_net_exit(struct net *net); +#else +static inline int nfs_fs_proc_net_init(struct net *net) +{ + return 0; +} +static inline void nfs_fs_proc_net_exit(struct net *net) +{ +} +static inline int nfs_fs_proc_init(void) +{ + return 0; +} +static inline void nfs_fs_proc_exit(void) +{ +} +#endif + +#ifdef CONFIG_NFS_V4_1 +int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); +#endif + +/* callback_xdr.c */ +extern struct svc_version nfs4_callback_version1; +extern struct svc_version nfs4_callback_version4; + +struct nfs_pageio_descriptor; +/* 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); +extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, + struct nfs_pgio_header *hdr, + void (*release)(struct nfs_pgio_header *hdr)); +void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); +int nfs_iocounter_wait(struct nfs_io_counter *c); + +extern const struct nfs_pageio_ops nfs_pgio_rw_ops; +struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); +void nfs_pgio_header_free(struct nfs_pgio_header *); +void nfs_pgio_data_destroy(struct nfs_pgio_header *); +int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); +int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, + struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, + const struct rpc_call_ops *call_ops, int how, int flags); +void nfs_free_request(struct nfs_page *req); +struct nfs_pgio_mirror * +nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); + +static inline void nfs_iocounter_init(struct nfs_io_counter *c) +{ + c->flags = 0; + atomic_set(&c->io_count, 0); +} + +static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) +{ + WARN_ON_ONCE(desc->pg_mirror_count < 1); + return desc->pg_mirror_count > 1; +} + +/* nfs2xdr.c */ +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 */ +#if IS_ENABLED(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; +extern const u32 nfs41_maxgetdevinfo_overhead; +#endif + +/* nfs4proc.c */ +#if IS_ENABLED(CONFIG_NFS_V4) +extern struct rpc_procinfo nfs4_procedures[]; +#endif + +#ifdef CONFIG_NFS_V4_SECURITY_LABEL +extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); +static inline void nfs4_label_free(struct nfs4_label *label) +{ + if (label) { + kfree(label->label); + kfree(label); + } + return; +} + +static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) +{ + if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) + nfsi->cache_validity |= NFS_INO_INVALID_LABEL; +} +#else +static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } +static inline void nfs4_label_free(void *label) {} +static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) +{ +} +#endif /* CONFIG_NFS_V4_SECURITY_LABEL */ + +/* proc.c */ +void nfs_close_context(struct nfs_open_context *ctx, int is_sync); +extern struct nfs_client *nfs_init_client(struct nfs_client *clp, + const struct rpc_timeout *timeparms, + const char *ip_addr); + +/* dir.c */ +extern void nfs_force_use_readdirplus(struct inode *dir); +extern unsigned long nfs_access_cache_count(struct shrinker *shrink, + struct shrink_control *sc); +extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, + struct shrink_control *sc); +struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); +int nfs_create(struct inode *, struct dentry *, umode_t, bool); +int nfs_mkdir(struct inode *, struct dentry *, umode_t); +int nfs_rmdir(struct inode *, struct dentry *); +int nfs_unlink(struct inode *, struct dentry *); +int nfs_symlink(struct inode *, struct dentry *, const char *); +int nfs_link(struct dentry *, struct inode *, struct dentry *); +int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); +int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); + +/* file.c */ +int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); +loff_t nfs_file_llseek(struct file *, loff_t, int); +int nfs_file_flush(struct file *, fl_owner_t); +ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); +ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, + size_t, unsigned int); +int nfs_file_mmap(struct file *, struct vm_area_struct *); +ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); +int nfs_file_release(struct inode *, struct file *); +int nfs_lock(struct file *, int, struct file_lock *); +int nfs_flock(struct file *, int, struct file_lock *); +int nfs_check_flags(int); + +/* 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 int nfs_drop_inode(struct inode *); +extern void nfs_clear_inode(struct inode *); +extern void nfs_evict_inode(struct inode *); +void nfs_zap_acl_cache(struct inode *inode); +extern int nfs_wait_bit_killable(struct wait_bit_key *key); + +/* super.c */ +extern const struct super_operations nfs_sops; +extern struct file_system_type nfs_fs_type; +extern struct file_system_type nfs_xdev_fs_type; +#if IS_ENABLED(CONFIG_NFS_V4) +extern struct file_system_type nfs4_xdev_fs_type; +extern struct file_system_type nfs4_referral_fs_type; +#endif +bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); +struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, + struct nfs_subversion *); +void nfs_initialise_sb(struct super_block *); +int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); +int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); +struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, + struct nfs_mount_info *, struct nfs_subversion *); +struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); +struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, + const char *, struct nfs_mount_info *); +void nfs_kill_super(struct super_block *); +void nfs_fill_super(struct super_block *, struct nfs_mount_info *); + +extern struct rpc_stat nfs_rpcstat; + +extern int __init register_nfs_fs(void); +extern void __exit unregister_nfs_fs(void); +extern bool nfs_sb_active(struct super_block *sb); +extern void nfs_sb_deactive(struct super_block *sb); + +/* namespace.c */ +#define NFS_PATH_CANONICAL 1 +extern char *nfs_path(char **p, struct dentry *dentry, + char *buffer, ssize_t buflen, unsigned flags); +extern struct vfsmount *nfs_d_automount(struct path *path); +struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, + struct nfs_fh *, struct nfs_fattr *); +struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, + struct nfs_fattr *, rpc_authflavor_t); + +/* getroot.c */ +extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, + const char *); +#if IS_ENABLED(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, bool); +#endif + +struct nfs_pgio_completion_ops; +/* read.c */ +extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, + struct inode *inode, bool force_mds, + const struct nfs_pgio_completion_ops *compl_ops); +extern void nfs_read_prepare(struct rpc_task *task, void *calldata); +extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); + +/* super.c */ +void nfs_clone_super(struct super_block *, struct nfs_mount_info *); +void nfs_umount_begin(struct super_block *); +int nfs_statfs(struct dentry *, struct kstatfs *); +int nfs_show_options(struct seq_file *, struct dentry *); +int nfs_show_devname(struct seq_file *, struct dentry *); +int nfs_show_path(struct seq_file *, struct dentry *); +int nfs_show_stats(struct seq_file *, struct dentry *); +int nfs_remount(struct super_block *sb, int *flags, char *raw_data); + +/* write.c */ +extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, + struct inode *inode, int ioflags, bool force_mds, + const struct nfs_pgio_completion_ops *compl_ops); +extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); +extern void nfs_commit_free(struct nfs_commit_data *p); +extern void nfs_write_prepare(struct rpc_task *task, void *calldata); +extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); +extern int nfs_initiate_commit(struct rpc_clnt *clnt, + struct nfs_commit_data *data, + const struct nfs_rpc_ops *nfs_ops, + const struct rpc_call_ops *call_ops, + int how, int flags); +extern void nfs_init_commit(struct nfs_commit_data *data, + struct list_head *head, + struct pnfs_layout_segment *lseg, + struct nfs_commit_info *cinfo); +int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, + struct nfs_commit_info *cinfo, int max); +unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); +int nfs_scan_commit(struct inode *inode, struct list_head *dst, + struct nfs_commit_info *cinfo); +void nfs_mark_request_commit(struct nfs_page *req, + struct pnfs_layout_segment *lseg, + struct nfs_commit_info *cinfo, + u32 ds_commit_idx); +int nfs_write_need_commit(struct nfs_pgio_header *); +void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); +int nfs_generic_commit_list(struct inode *inode, struct list_head *head, + int how, struct nfs_commit_info *cinfo); +void nfs_retry_commit(struct list_head *page_list, + struct pnfs_layout_segment *lseg, + struct nfs_commit_info *cinfo, + u32 ds_commit_idx); +void nfs_commitdata_release(struct nfs_commit_data *data); +void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, + struct nfs_commit_info *cinfo); +void nfs_request_remove_commit_list(struct nfs_page *req, + struct nfs_commit_info *cinfo); +void nfs_init_cinfo(struct nfs_commit_info *cinfo, + struct inode *inode, + struct nfs_direct_req *dreq); +int nfs_key_timeout_notify(struct file *filp, struct inode *inode); +bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); +void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); + +#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 + +/* unlink.c */ +extern struct rpc_task * +nfs_async_rename(struct inode *old_dir, struct inode *new_dir, + struct dentry *old_dentry, struct dentry *new_dentry, + void (*complete)(struct rpc_task *, struct nfs_renamedata *)); +extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); + +/* direct.c */ +void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, + struct nfs_direct_req *dreq); +static inline void nfs_inode_dio_wait(struct inode *inode) +{ + inode_dio_wait(inode); +} +extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); +extern void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq); + +/* nfs4proc.c */ +extern void __nfs4_read_done_cb(struct nfs_pgio_header *); +extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, + const struct rpc_timeout *timeparms, + const char *ip_addr); +extern int nfs40_walk_client_list(struct nfs_client *clp, + struct nfs_client **result, + struct rpc_cred *cred); +extern int nfs41_walk_client_list(struct nfs_client *clp, + struct nfs_client **result, + struct rpc_cred *cred); + +static inline struct inode *nfs_igrab_and_active(struct inode *inode) +{ + inode = igrab(inode); + if (inode != NULL && !nfs_sb_active(inode->i_sb)) { + iput(inode); + inode = NULL; + } + return inode; +} + +static inline void nfs_iput_and_deactive(struct inode *inode) +{ + if (inode != NULL) { + struct super_block *sb = inode->i_sb; + + iput(inode); + nfs_sb_deactive(sb); + } +} + +/* + * 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, NFS_PATH_CANONICAL); +} + +/* + * 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; +} + +/* + * Record the page as unstable and mark its inode as dirty. + */ +static inline +void nfs_mark_page_unstable(struct page *page) +{ + struct inode *inode = page_file_mapping(page)->host; + + inc_zone_page_state(page, NR_UNSTABLE_NFS); + inc_bdi_stat(inode_to_bdi(inode), BDI_RECLAIMABLE); + __mark_inode_dirty(inode, I_DIRTY_DATASYNC); +} + +/* + * 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_file_mapping(page)->host); + + if (i_size > 0) { + pgoff_t page_index = page_file_index(page); + 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; +} + +/* + * Convert a struct timespec into a 64-bit change attribute + * + * This does approximately the same thing as timespec_to_ns(), + * but for calculation efficiency, we multiply the seconds by + * 1024*1024*1024. + */ +static inline +u64 nfs_timespec_to_change_attr(const struct timespec *ts) +{ + return ((u64)ts->tv_sec << 30) + ts->tv_nsec; +} + +#ifdef CONFIG_CRC32 +/** + * nfs_fhandle_hash - calculate the crc32 hash for the filehandle + * @fh - pointer to filehandle + * + * returns a crc32 hash for the filehandle that is compatible with + * the one displayed by "wireshark". + */ +static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) +{ + return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); +} +#else +static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) +{ + return 0; +} +#endif |