1/* 2 * NFS internal definitions 3 */ 4 5#include "nfs4_fs.h" 6#include <linux/mount.h> 7#include <linux/security.h> 8#include <linux/crc32.h> 9#include <linux/nfs_page.h> 10 11#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 12 13struct nfs_string; 14 15/* Maximum number of readahead requests 16 * FIXME: this should really be a sysctl so that users may tune it to suit 17 * their needs. People that do NFS over a slow network, might for 18 * instance want to reduce it to something closer to 1 for improved 19 * interactive response. 20 */ 21#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 22 23static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 24{ 25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 27} 28 29static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 30{ 31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 34 return 0; 35 return 1; 36} 37 38struct nfs_clone_mount { 39 const struct super_block *sb; 40 const struct dentry *dentry; 41 struct nfs_fh *fh; 42 struct nfs_fattr *fattr; 43 char *hostname; 44 char *mnt_path; 45 struct sockaddr *addr; 46 size_t addrlen; 47 rpc_authflavor_t authflavor; 48}; 49 50/* 51 * Note: RFC 1813 doesn't limit the number of auth flavors that 52 * a server can return, so make something up. 53 */ 54#define NFS_MAX_SECFLAVORS (12) 55 56/* 57 * Value used if the user did not specify a port value. 58 */ 59#define NFS_UNSPEC_PORT (-1) 60 61/* 62 * Maximum number of pages that readdir can use for creating 63 * a vmapped array of pages. 64 */ 65#define NFS_MAX_READDIR_PAGES 8 66 67struct nfs_client_initdata { 68 unsigned long init_flags; 69 const char *hostname; 70 const struct sockaddr *addr; 71 size_t addrlen; 72 struct nfs_subversion *nfs_mod; 73 int proto; 74 u32 minorversion; 75 struct net *net; 76}; 77 78/* 79 * In-kernel mount arguments 80 */ 81struct nfs_parsed_mount_data { 82 int flags; 83 unsigned int rsize, wsize; 84 unsigned int timeo, retrans; 85 unsigned int acregmin, acregmax, 86 acdirmin, acdirmax; 87 unsigned int namlen; 88 unsigned int options; 89 unsigned int bsize; 90 struct nfs_auth_info auth_info; 91 rpc_authflavor_t selected_flavor; 92 char *client_address; 93 unsigned int version; 94 unsigned int minorversion; 95 char *fscache_uniq; 96 bool need_mount; 97 98 struct { 99 struct sockaddr_storage address; 100 size_t addrlen; 101 char *hostname; 102 u32 version; 103 int port; 104 unsigned short protocol; 105 } mount_server; 106 107 struct { 108 struct sockaddr_storage address; 109 size_t addrlen; 110 char *hostname; 111 char *export_path; 112 int port; 113 unsigned short protocol; 114 } nfs_server; 115 116 struct security_mnt_opts lsm_opts; 117 struct net *net; 118}; 119 120/* mount_clnt.c */ 121struct nfs_mount_request { 122 struct sockaddr *sap; 123 size_t salen; 124 char *hostname; 125 char *dirpath; 126 u32 version; 127 unsigned short protocol; 128 struct nfs_fh *fh; 129 int noresvport; 130 unsigned int *auth_flav_len; 131 rpc_authflavor_t *auth_flavs; 132 struct net *net; 133}; 134 135struct nfs_mount_info { 136 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 137 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 138 struct nfs_parsed_mount_data *parsed; 139 struct nfs_clone_mount *cloned; 140 struct nfs_fh *mntfh; 141}; 142 143extern int nfs_mount(struct nfs_mount_request *info); 144extern void nfs_umount(const struct nfs_mount_request *info); 145 146/* client.c */ 147extern const struct rpc_program nfs_program; 148extern void nfs_clients_init(struct net *net); 149extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 150int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t); 151struct nfs_client *nfs_get_client(const struct nfs_client_initdata *, 152 const struct rpc_timeout *, const char *, 153 rpc_authflavor_t); 154int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 155void nfs_server_insert_lists(struct nfs_server *); 156void nfs_server_remove_lists(struct nfs_server *); 157void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int); 158int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 159 rpc_authflavor_t); 160struct nfs_server *nfs_alloc_server(void); 161void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 162 163extern void nfs_cleanup_cb_ident_idr(struct net *); 164extern void nfs_put_client(struct nfs_client *); 165extern void nfs_free_client(struct nfs_client *); 166extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 167extern struct nfs_client * 168nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 169 struct nfs4_sessionid *, u32); 170extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 171 struct nfs_subversion *); 172extern struct nfs_server *nfs4_create_server( 173 struct nfs_mount_info *, 174 struct nfs_subversion *); 175extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 176 struct nfs_fh *); 177extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 178 struct sockaddr *sap, size_t salen, 179 struct net *net); 180extern void nfs_free_server(struct nfs_server *server); 181extern struct nfs_server *nfs_clone_server(struct nfs_server *, 182 struct nfs_fh *, 183 struct nfs_fattr *, 184 rpc_authflavor_t); 185extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 186extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 187extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 188 const struct sockaddr *ds_addr, 189 int ds_addrlen, int ds_proto, 190 unsigned int ds_timeo, 191 unsigned int ds_retrans, 192 u32 minor_version, 193 rpc_authflavor_t au_flavor); 194extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 195 struct inode *); 196extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp, 197 const struct sockaddr *ds_addr, int ds_addrlen, 198 int ds_proto, unsigned int ds_timeo, 199 unsigned int ds_retrans, rpc_authflavor_t au_flavor); 200#ifdef CONFIG_PROC_FS 201extern int __init nfs_fs_proc_init(void); 202extern void nfs_fs_proc_exit(void); 203extern int nfs_fs_proc_net_init(struct net *net); 204extern void nfs_fs_proc_net_exit(struct net *net); 205#else 206static inline int nfs_fs_proc_net_init(struct net *net) 207{ 208 return 0; 209} 210static inline void nfs_fs_proc_net_exit(struct net *net) 211{ 212} 213static inline int nfs_fs_proc_init(void) 214{ 215 return 0; 216} 217static inline void nfs_fs_proc_exit(void) 218{ 219} 220#endif 221 222#ifdef CONFIG_NFS_V4_1 223int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 224#endif 225 226/* callback_xdr.c */ 227extern struct svc_version nfs4_callback_version1; 228extern struct svc_version nfs4_callback_version4; 229 230struct nfs_pageio_descriptor; 231/* pagelist.c */ 232extern int __init nfs_init_nfspagecache(void); 233extern void nfs_destroy_nfspagecache(void); 234extern int __init nfs_init_readpagecache(void); 235extern void nfs_destroy_readpagecache(void); 236extern int __init nfs_init_writepagecache(void); 237extern void nfs_destroy_writepagecache(void); 238 239extern int __init nfs_init_directcache(void); 240extern void nfs_destroy_directcache(void); 241extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 242 struct nfs_pgio_header *hdr, 243 void (*release)(struct nfs_pgio_header *hdr)); 244void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 245int nfs_iocounter_wait(struct nfs_io_counter *c); 246 247extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 248struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 249void nfs_pgio_header_free(struct nfs_pgio_header *); 250void nfs_pgio_data_destroy(struct nfs_pgio_header *); 251int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 252int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 253 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, 254 const struct rpc_call_ops *call_ops, int how, int flags); 255void nfs_free_request(struct nfs_page *req); 256struct nfs_pgio_mirror * 257nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 258 259static inline void nfs_iocounter_init(struct nfs_io_counter *c) 260{ 261 c->flags = 0; 262 atomic_set(&c->io_count, 0); 263} 264 265static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 266{ 267 WARN_ON_ONCE(desc->pg_mirror_count < 1); 268 return desc->pg_mirror_count > 1; 269} 270 271/* nfs2xdr.c */ 272extern struct rpc_procinfo nfs_procedures[]; 273extern int nfs2_decode_dirent(struct xdr_stream *, 274 struct nfs_entry *, int); 275 276/* nfs3xdr.c */ 277extern struct rpc_procinfo nfs3_procedures[]; 278extern int nfs3_decode_dirent(struct xdr_stream *, 279 struct nfs_entry *, int); 280 281/* nfs4xdr.c */ 282#if IS_ENABLED(CONFIG_NFS_V4) 283extern int nfs4_decode_dirent(struct xdr_stream *, 284 struct nfs_entry *, int); 285#endif 286#ifdef CONFIG_NFS_V4_1 287extern const u32 nfs41_maxread_overhead; 288extern const u32 nfs41_maxwrite_overhead; 289extern const u32 nfs41_maxgetdevinfo_overhead; 290#endif 291 292/* nfs4proc.c */ 293#if IS_ENABLED(CONFIG_NFS_V4) 294extern struct rpc_procinfo nfs4_procedures[]; 295#endif 296 297#ifdef CONFIG_NFS_V4_SECURITY_LABEL 298extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 299static inline void nfs4_label_free(struct nfs4_label *label) 300{ 301 if (label) { 302 kfree(label->label); 303 kfree(label); 304 } 305 return; 306} 307 308static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 309{ 310 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 311 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 312} 313#else 314static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 315static inline void nfs4_label_free(void *label) {} 316static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 317{ 318} 319#endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 320 321/* proc.c */ 322void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 323extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 324 const struct rpc_timeout *timeparms, 325 const char *ip_addr); 326 327/* dir.c */ 328extern void nfs_force_use_readdirplus(struct inode *dir); 329extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 330 struct shrink_control *sc); 331extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 332 struct shrink_control *sc); 333struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 334int nfs_create(struct inode *, struct dentry *, umode_t, bool); 335int nfs_mkdir(struct inode *, struct dentry *, umode_t); 336int nfs_rmdir(struct inode *, struct dentry *); 337int nfs_unlink(struct inode *, struct dentry *); 338int nfs_symlink(struct inode *, struct dentry *, const char *); 339int nfs_link(struct dentry *, struct inode *, struct dentry *); 340int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 341int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 342 343/* file.c */ 344int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 345loff_t nfs_file_llseek(struct file *, loff_t, int); 346int nfs_file_flush(struct file *, fl_owner_t); 347ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 348ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 349 size_t, unsigned int); 350int nfs_file_mmap(struct file *, struct vm_area_struct *); 351ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 352int nfs_file_release(struct inode *, struct file *); 353int nfs_lock(struct file *, int, struct file_lock *); 354int nfs_flock(struct file *, int, struct file_lock *); 355int nfs_check_flags(int); 356 357/* inode.c */ 358extern struct workqueue_struct *nfsiod_workqueue; 359extern struct inode *nfs_alloc_inode(struct super_block *sb); 360extern void nfs_destroy_inode(struct inode *); 361extern int nfs_write_inode(struct inode *, struct writeback_control *); 362extern int nfs_drop_inode(struct inode *); 363extern void nfs_clear_inode(struct inode *); 364extern void nfs_evict_inode(struct inode *); 365void nfs_zap_acl_cache(struct inode *inode); 366extern int nfs_wait_bit_killable(struct wait_bit_key *key); 367 368/* super.c */ 369extern const struct super_operations nfs_sops; 370extern struct file_system_type nfs_fs_type; 371extern struct file_system_type nfs_xdev_fs_type; 372#if IS_ENABLED(CONFIG_NFS_V4) 373extern struct file_system_type nfs4_xdev_fs_type; 374extern struct file_system_type nfs4_referral_fs_type; 375#endif 376bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 377struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 378 struct nfs_subversion *); 379void nfs_initialise_sb(struct super_block *); 380int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 381int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 382struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 383 struct nfs_mount_info *, struct nfs_subversion *); 384struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 385struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 386 const char *, struct nfs_mount_info *); 387void nfs_kill_super(struct super_block *); 388void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 389 390extern struct rpc_stat nfs_rpcstat; 391 392extern int __init register_nfs_fs(void); 393extern void __exit unregister_nfs_fs(void); 394extern bool nfs_sb_active(struct super_block *sb); 395extern void nfs_sb_deactive(struct super_block *sb); 396 397/* namespace.c */ 398#define NFS_PATH_CANONICAL 1 399extern char *nfs_path(char **p, struct dentry *dentry, 400 char *buffer, ssize_t buflen, unsigned flags); 401extern struct vfsmount *nfs_d_automount(struct path *path); 402struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 403 struct nfs_fh *, struct nfs_fattr *); 404struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 405 struct nfs_fattr *, rpc_authflavor_t); 406 407/* getroot.c */ 408extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 409 const char *); 410#if IS_ENABLED(CONFIG_NFS_V4) 411extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 412 const char *); 413 414extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 415#endif 416 417struct nfs_pgio_completion_ops; 418/* read.c */ 419extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 420 struct inode *inode, bool force_mds, 421 const struct nfs_pgio_completion_ops *compl_ops); 422extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 423extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 424 425/* super.c */ 426void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 427void nfs_umount_begin(struct super_block *); 428int nfs_statfs(struct dentry *, struct kstatfs *); 429int nfs_show_options(struct seq_file *, struct dentry *); 430int nfs_show_devname(struct seq_file *, struct dentry *); 431int nfs_show_path(struct seq_file *, struct dentry *); 432int nfs_show_stats(struct seq_file *, struct dentry *); 433int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 434 435/* write.c */ 436extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 437 struct inode *inode, int ioflags, bool force_mds, 438 const struct nfs_pgio_completion_ops *compl_ops); 439extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 440extern void nfs_commit_free(struct nfs_commit_data *p); 441extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 442extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 443extern int nfs_initiate_commit(struct rpc_clnt *clnt, 444 struct nfs_commit_data *data, 445 const struct nfs_rpc_ops *nfs_ops, 446 const struct rpc_call_ops *call_ops, 447 int how, int flags); 448extern void nfs_init_commit(struct nfs_commit_data *data, 449 struct list_head *head, 450 struct pnfs_layout_segment *lseg, 451 struct nfs_commit_info *cinfo); 452int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 453 struct nfs_commit_info *cinfo, int max); 454unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 455int nfs_scan_commit(struct inode *inode, struct list_head *dst, 456 struct nfs_commit_info *cinfo); 457void nfs_mark_request_commit(struct nfs_page *req, 458 struct pnfs_layout_segment *lseg, 459 struct nfs_commit_info *cinfo, 460 u32 ds_commit_idx); 461int nfs_write_need_commit(struct nfs_pgio_header *); 462void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 463int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 464 int how, struct nfs_commit_info *cinfo); 465void nfs_retry_commit(struct list_head *page_list, 466 struct pnfs_layout_segment *lseg, 467 struct nfs_commit_info *cinfo, 468 u32 ds_commit_idx); 469void nfs_commitdata_release(struct nfs_commit_data *data); 470void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 471 struct nfs_commit_info *cinfo); 472void nfs_request_remove_commit_list(struct nfs_page *req, 473 struct nfs_commit_info *cinfo); 474void nfs_init_cinfo(struct nfs_commit_info *cinfo, 475 struct inode *inode, 476 struct nfs_direct_req *dreq); 477int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 478bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 479void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 480 481#ifdef CONFIG_MIGRATION 482extern int nfs_migrate_page(struct address_space *, 483 struct page *, struct page *, enum migrate_mode); 484#else 485#define nfs_migrate_page NULL 486#endif 487 488/* unlink.c */ 489extern struct rpc_task * 490nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 491 struct dentry *old_dentry, struct dentry *new_dentry, 492 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 493extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 494 495/* direct.c */ 496void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 497 struct nfs_direct_req *dreq); 498static inline void nfs_inode_dio_wait(struct inode *inode) 499{ 500 inode_dio_wait(inode); 501} 502extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 503extern void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq); 504 505/* nfs4proc.c */ 506extern void __nfs4_read_done_cb(struct nfs_pgio_header *); 507extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 508 const struct rpc_timeout *timeparms, 509 const char *ip_addr); 510extern int nfs40_walk_client_list(struct nfs_client *clp, 511 struct nfs_client **result, 512 struct rpc_cred *cred); 513extern int nfs41_walk_client_list(struct nfs_client *clp, 514 struct nfs_client **result, 515 struct rpc_cred *cred); 516 517static inline struct inode *nfs_igrab_and_active(struct inode *inode) 518{ 519 inode = igrab(inode); 520 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 521 iput(inode); 522 inode = NULL; 523 } 524 return inode; 525} 526 527static inline void nfs_iput_and_deactive(struct inode *inode) 528{ 529 if (inode != NULL) { 530 struct super_block *sb = inode->i_sb; 531 532 iput(inode); 533 nfs_sb_deactive(sb); 534 } 535} 536 537/* 538 * Determine the device name as a string 539 */ 540static inline char *nfs_devname(struct dentry *dentry, 541 char *buffer, ssize_t buflen) 542{ 543 char *dummy; 544 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 545} 546 547/* 548 * Determine the actual block size (and log2 thereof) 549 */ 550static inline 551unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 552{ 553 /* make sure blocksize is a power of two */ 554 if ((bsize & (bsize - 1)) || nrbitsp) { 555 unsigned char nrbits; 556 557 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 558 ; 559 bsize = 1 << nrbits; 560 if (nrbitsp) 561 *nrbitsp = nrbits; 562 } 563 564 return bsize; 565} 566 567/* 568 * Calculate the number of 512byte blocks used. 569 */ 570static inline blkcnt_t nfs_calc_block_size(u64 tsize) 571{ 572 blkcnt_t used = (tsize + 511) >> 9; 573 return (used > ULONG_MAX) ? ULONG_MAX : used; 574} 575 576/* 577 * Compute and set NFS server blocksize 578 */ 579static inline 580unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 581{ 582 if (bsize < NFS_MIN_FILE_IO_SIZE) 583 bsize = NFS_DEF_FILE_IO_SIZE; 584 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 585 bsize = NFS_MAX_FILE_IO_SIZE; 586 587 return nfs_block_bits(bsize, nrbitsp); 588} 589 590/* 591 * Determine the maximum file size for a superblock 592 */ 593static inline 594void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 595{ 596 sb->s_maxbytes = (loff_t)maxfilesize; 597 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 598 sb->s_maxbytes = MAX_LFS_FILESIZE; 599} 600 601/* 602 * Record the page as unstable and mark its inode as dirty. 603 */ 604static inline 605void nfs_mark_page_unstable(struct page *page) 606{ 607 struct inode *inode = page_file_mapping(page)->host; 608 609 inc_zone_page_state(page, NR_UNSTABLE_NFS); 610 inc_bdi_stat(inode_to_bdi(inode), BDI_RECLAIMABLE); 611 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 612} 613 614/* 615 * Determine the number of bytes of data the page contains 616 */ 617static inline 618unsigned int nfs_page_length(struct page *page) 619{ 620 loff_t i_size = i_size_read(page_file_mapping(page)->host); 621 622 if (i_size > 0) { 623 pgoff_t page_index = page_file_index(page); 624 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 625 if (page_index < end_index) 626 return PAGE_CACHE_SIZE; 627 if (page_index == end_index) 628 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 629 } 630 return 0; 631} 632 633/* 634 * Convert a umode to a dirent->d_type 635 */ 636static inline 637unsigned char nfs_umode_to_dtype(umode_t mode) 638{ 639 return (mode >> 12) & 15; 640} 641 642/* 643 * Determine the number of pages in an array of length 'len' and 644 * with a base offset of 'base' 645 */ 646static inline 647unsigned int nfs_page_array_len(unsigned int base, size_t len) 648{ 649 return ((unsigned long)len + (unsigned long)base + 650 PAGE_SIZE - 1) >> PAGE_SHIFT; 651} 652 653/* 654 * Convert a struct timespec into a 64-bit change attribute 655 * 656 * This does approximately the same thing as timespec_to_ns(), 657 * but for calculation efficiency, we multiply the seconds by 658 * 1024*1024*1024. 659 */ 660static inline 661u64 nfs_timespec_to_change_attr(const struct timespec *ts) 662{ 663 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 664} 665 666#ifdef CONFIG_CRC32 667/** 668 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 669 * @fh - pointer to filehandle 670 * 671 * returns a crc32 hash for the filehandle that is compatible with 672 * the one displayed by "wireshark". 673 */ 674static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 675{ 676 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 677} 678#else 679static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 680{ 681 return 0; 682} 683#endif 684