fs/orangefs/orangefs-kernel.h

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * See COPYING in top-level directory.
   5  */
   6
   7 /*
   8  *  The ORANGEFS Linux kernel support allows ORANGEFS volumes to be mounted and
   9  *  accessed through the Linux VFS (i.e. using standard I/O system calls).
  10  *  This support is only needed on clients that wish to mount the file system.
  11  *
  12  */
  13
  14 /*
  15  *  Declarations and macros for the ORANGEFS Linux kernel support.
  16  */
  17
  18 #ifndef __ORANGEFSKERNEL_H
  19 #define __ORANGEFSKERNEL_H
  20
  21 #include <linux/kernel.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/statfs.h>
  24 #include <linux/backing-dev.h>
  25 #include <linux/device.h>
  26 #include <linux/mpage.h>
  27 #include <linux/namei.h>
  28 #include <linux/errno.h>
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/slab.h>
  32 #include <linux/types.h>
  33 #include <linux/fs.h>
  34 #include <linux/vmalloc.h>
  35
  36 #include <linux/aio.h>
  37 #include <linux/posix_acl.h>
  38 #include <linux/posix_acl_xattr.h>
  39 #include <linux/compat.h>
  40 #include <linux/mount.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/atomic.h>
  43 #include <linux/uio.h>
  44 #include <linux/sched.h>
  45 #include <linux/mm.h>
  46 #include <linux/wait.h>
  47 #include <linux/dcache.h>
  48 #include <linux/pagemap.h>
  49 #include <linux/poll.h>
  50 #include <linux/rwsem.h>
  51 #include <linux/xattr.h>
  52 #include <linux/exportfs.h>
  53
  54 #include <asm/unaligned.h>
  55
  56 #include "orangefs-dev-proto.h"
  57
  58 #ifdef ORANGEFS_KERNEL_DEBUG
  59 #define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS       10
  60 #else
  61 #define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS       20
  62 #endif
  63
  64 #define ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS   30
  65
  66 #define ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS     900      /* 15 minutes */
  67
  68 #define ORANGEFS_REQDEVICE_NAME          "pvfs2-req"
  69
  70 #define ORANGEFS_DEVREQ_MAGIC             0x20030529
  71 #define ORANGEFS_LINK_MAX                 0x000000FF
  72 #define ORANGEFS_PURGE_RETRY_COUNT     0x00000005
  73 #define ORANGEFS_MAX_NUM_OPTIONS          0x00000004
  74 #define ORANGEFS_MAX_MOUNT_OPT_LEN        0x00000080
  75 #define ORANGEFS_MAX_FSKEY_LEN            64
  76
  77 #define MAX_DEV_REQ_UPSIZE (2 * sizeof(__s32) +   \
  78 sizeof(__u64) + sizeof(struct orangefs_upcall_s))
  79 #define MAX_DEV_REQ_DOWNSIZE (2 * sizeof(__s32) + \
  80 sizeof(__u64) + sizeof(struct orangefs_downcall_s))
  81
  82 /*
  83  * valid orangefs kernel operation states
  84  *
  85  * unknown  - op was just initialized
  86  * waiting  - op is on request_list (upward bound)
  87  * inprogr  - op is in progress (waiting for downcall)
  88  * serviced - op has matching downcall; ok
  89  * purged   - op has to start a timer since client-core
  90  *            exited uncleanly before servicing op
  91  * given up - submitter has given up waiting for it
  92  */
  93 enum orangefs_vfs_op_states {
  94         OP_VFS_STATE_UNKNOWN = 0,
  95         OP_VFS_STATE_WAITING = 1,
  96         OP_VFS_STATE_INPROGR = 2,
  97         OP_VFS_STATE_SERVICED = 4,
  98         OP_VFS_STATE_PURGED = 8,
  99         OP_VFS_STATE_GIVEN_UP = 16,
 100 };
 101
 102 /*
 103  * orangefs kernel memory related flags
 104  */
 105
 106 #if ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB))
 107 #define ORANGEFS_CACHE_CREATE_FLAGS SLAB_RED_ZONE
 108 #else
 109 #define ORANGEFS_CACHE_CREATE_FLAGS 0
 110 #endif /* ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB)) */
 111
 112 extern int orangefs_init_acl(struct inode *inode, struct inode *dir);
 113 extern const struct xattr_handler *orangefs_xattr_handlers[];
 114
 115 extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type);
 116 extern int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 117
 118 /*
 119  * Redefine xtvec structure so that we could move helper functions out of
 120  * the define
 121  */
 122 struct xtvec {
 123         __kernel_off_t xtv_off;         /* must be off_t */
 124         __kernel_size_t xtv_len;        /* must be size_t */
 125 };
 126
 127 /*
 128  * orangefs data structures
 129  */
 130 struct orangefs_kernel_op_s {
 131         enum orangefs_vfs_op_states op_state;
 132         __u64 tag;
 133
 134         /*
 135          * Set uses_shared_memory to non zero if this operation uses
 136          * shared memory. If true, then a retry on the op must also
 137          * get a new shared memory buffer and re-populate it.
 138          * Cancels don't care - it only matters for service_operation()
 139          * retry logics and cancels don't go through it anymore. It
 140          * safely stays non-zero when we use it as slot_to_free.
 141          */
 142         union {
 143                 int uses_shared_memory;
 144                 int slot_to_free;
 145         };
 146
 147         struct orangefs_upcall_s upcall;
 148         struct orangefs_downcall_s downcall;
 149
 150         struct completion waitq;
 151         spinlock_t lock;
 152
 153         int attempts;
 154
 155         struct list_head list;
 156 };
 157
 158 #define set_op_state_waiting(op)     ((op)->op_state = OP_VFS_STATE_WAITING)
 159 #define set_op_state_inprogress(op)  ((op)->op_state = OP_VFS_STATE_INPROGR)
 160 #define set_op_state_given_up(op)  ((op)->op_state = OP_VFS_STATE_GIVEN_UP)
 161 static inline void set_op_state_serviced(struct orangefs_kernel_op_s *op)
 162 {
 163         op->op_state = OP_VFS_STATE_SERVICED;
 164         complete(&op->waitq);
 165 }
 166
 167 #define op_state_waiting(op)     ((op)->op_state & OP_VFS_STATE_WAITING)
 168 #define op_state_in_progress(op) ((op)->op_state & OP_VFS_STATE_INPROGR)
 169 #define op_state_serviced(op)    ((op)->op_state & OP_VFS_STATE_SERVICED)
 170 #define op_state_purged(op)      ((op)->op_state & OP_VFS_STATE_PURGED)
 171 #define op_state_given_up(op)    ((op)->op_state & OP_VFS_STATE_GIVEN_UP)
 172 #define op_is_cancel(op)         ((op)->upcall.type == ORANGEFS_VFS_OP_CANCEL)
 173
 174 void op_release(struct orangefs_kernel_op_s *op);
 175
 176 extern void orangefs_bufmap_put(int);
 177 static inline void put_cancel(struct orangefs_kernel_op_s *op)
 178 {
 179         orangefs_bufmap_put(op->slot_to_free);
 180         op_release(op);
 181 }
 182
 183 static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
 184 {
 185         spin_lock(&op->lock);
 186         if (unlikely(op_is_cancel(op))) {
 187                 list_del_init(&op->list);
 188                 spin_unlock(&op->lock);
 189                 put_cancel(op);
 190         } else {
 191                 op->op_state |= OP_VFS_STATE_PURGED;
 192                 complete(&op->waitq);
 193                 spin_unlock(&op->lock);
 194         }
 195 }
 196
 197 /* per inode private orangefs info */
 198 struct orangefs_inode_s {
 199         struct orangefs_object_kref refn;
 200         char link_target[ORANGEFS_NAME_MAX];
 201         __s64 blksize;
 202         /*
 203          * Reading/Writing Extended attributes need to acquire the appropriate
 204          * reader/writer semaphore on the orangefs_inode_s structure.
 205          */
 206         struct rw_semaphore xattr_sem;
 207
 208         struct inode vfs_inode;
 209         sector_t last_failed_block_index_read;
 210
 211         /*
 212          * State of in-memory attributes not yet flushed to disk associated
 213          * with this object
 214          */
 215         unsigned long pinode_flags;
 216
 217         unsigned long getattr_time;
 218 };
 219
 220 #define P_ATIME_FLAG 0
 221 #define P_MTIME_FLAG 1
 222 #define P_CTIME_FLAG 2
 223 #define P_MODE_FLAG  3
 224
 225 #define ClearAtimeFlag(pinode) clear_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
 226 #define SetAtimeFlag(pinode)   set_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
 227 #define AtimeFlag(pinode)      test_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
 228
 229 #define ClearMtimeFlag(pinode) clear_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
 230 #define SetMtimeFlag(pinode)   set_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
 231 #define MtimeFlag(pinode)      test_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
 232
 233 #define ClearCtimeFlag(pinode) clear_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
 234 #define SetCtimeFlag(pinode)   set_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
 235 #define CtimeFlag(pinode)      test_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
 236
 237 #define ClearModeFlag(pinode) clear_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
 238 #define SetModeFlag(pinode)   set_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
 239 #define ModeFlag(pinode)      test_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
 240
 241 /* per superblock private orangefs info */
 242 struct orangefs_sb_info_s {
 243         struct orangefs_khandle root_khandle;
 244         __s32 fs_id;
 245         int id;
 246         int flags;
 247 #define ORANGEFS_OPT_INTR       0x01
 248 #define ORANGEFS_OPT_LOCAL_LOCK 0x02
 249         char devname[ORANGEFS_MAX_SERVER_ADDR_LEN];
 250         struct super_block *sb;
 251         int mount_pending;
 252         struct list_head list;
 253 };
 254
 255 /*
 256  * structure that holds the state of any async I/O operation issued
 257  * through the VFS. Needed especially to handle cancellation requests
 258  * or even completion notification so that the VFS client-side daemon
 259  * can free up its vfs_request slots.
 260  */
 261 struct orangefs_kiocb_s {
 262         /* the pointer to the task that initiated the AIO */
 263         struct task_struct *tsk;
 264
 265         /* pointer to the kiocb that kicked this operation */
 266         struct kiocb *kiocb;
 267
 268         /* buffer index that was used for the I/O */
 269         struct orangefs_bufmap *bufmap;
 270         int buffer_index;
 271
 272         /* orangefs kernel operation type */
 273         struct orangefs_kernel_op_s *op;
 274
 275         /* The user space buffers from/to which I/O is being staged */
 276         struct iovec *iov;
 277
 278         /* number of elements in the iovector */
 279         unsigned long nr_segs;
 280
 281         /* set to indicate the type of the operation */
 282         int rw;
 283
 284         /* file offset */
 285         loff_t offset;
 286
 287         /* and the count in bytes */
 288         size_t bytes_to_be_copied;
 289
 290         ssize_t bytes_copied;
 291         int needs_cleanup;
 292 };
 293
 294 struct orangefs_stats {
 295         unsigned long cache_hits;
 296         unsigned long cache_misses;
 297         unsigned long reads;
 298         unsigned long writes;
 299 };
 300
 301 extern struct orangefs_stats orangefs_stats;
 302
 303 /*
 304  * NOTE: See Documentation/filesystems/porting for information
 305  * on implementing FOO_I and properly accessing fs private data
 306  */
 307 static inline struct orangefs_inode_s *ORANGEFS_I(struct inode *inode)
 308 {
 309         return container_of(inode, struct orangefs_inode_s, vfs_inode);
 310 }
 311
 312 static inline struct orangefs_sb_info_s *ORANGEFS_SB(struct super_block *sb)
 313 {
 314         return (struct orangefs_sb_info_s *) sb->s_fs_info;
 315 }
 316
 317 /* ino_t descends from "unsigned long", 8 bytes, 64 bits. */
 318 static inline ino_t orangefs_khandle_to_ino(struct orangefs_khandle *khandle)
 319 {
 320         union {
 321                 unsigned char u[8];
 322                 __u64 ino;
 323         } ihandle;
 324
 325         ihandle.u[0] = khandle->u[0] ^ khandle->u[4];
 326         ihandle.u[1] = khandle->u[1] ^ khandle->u[5];
 327         ihandle.u[2] = khandle->u[2] ^ khandle->u[6];
 328         ihandle.u[3] = khandle->u[3] ^ khandle->u[7];
 329         ihandle.u[4] = khandle->u[12] ^ khandle->u[8];
 330         ihandle.u[5] = khandle->u[13] ^ khandle->u[9];
 331         ihandle.u[6] = khandle->u[14] ^ khandle->u[10];
 332         ihandle.u[7] = khandle->u[15] ^ khandle->u[11];
 333
 334         return ihandle.ino;
 335 }
 336
 337 static inline struct orangefs_khandle *get_khandle_from_ino(struct inode *inode)
 338 {
 339         return &(ORANGEFS_I(inode)->refn.khandle);
 340 }
 341
 342 static inline __s32 get_fsid_from_ino(struct inode *inode)
 343 {
 344         return ORANGEFS_I(inode)->refn.fs_id;
 345 }
 346
 347 static inline ino_t get_ino_from_khandle(struct inode *inode)
 348 {
 349         struct orangefs_khandle *khandle;
 350         ino_t ino;
 351
 352         khandle = get_khandle_from_ino(inode);
 353         ino = orangefs_khandle_to_ino(khandle);
 354         return ino;
 355 }
 356
 357 static inline ino_t get_parent_ino_from_dentry(struct dentry *dentry)
 358 {
 359         return get_ino_from_khandle(dentry->d_parent->d_inode);
 360 }
 361
 362 static inline int is_root_handle(struct inode *inode)
 363 {
 364         gossip_debug(GOSSIP_DCACHE_DEBUG,
 365                      "%s: root handle: %pU, this handle: %pU:\n",
 366                      __func__,
 367                      &ORANGEFS_SB(inode->i_sb)->root_khandle,
 368                      get_khandle_from_ino(inode));
 369
 370         if (ORANGEFS_khandle_cmp(&(ORANGEFS_SB(inode->i_sb)->root_khandle),
 371                              get_khandle_from_ino(inode)))
 372                 return 0;
 373         else
 374                 return 1;
 375 }
 376
 377 static inline int match_handle(struct orangefs_khandle resp_handle,
 378                                struct inode *inode)
 379 {
 380         gossip_debug(GOSSIP_DCACHE_DEBUG,
 381                      "%s: one handle: %pU, another handle:%pU:\n",
 382                      __func__,
 383                      &resp_handle,
 384                      get_khandle_from_ino(inode));
 385
 386         if (ORANGEFS_khandle_cmp(&resp_handle, get_khandle_from_ino(inode)))
 387                 return 0;
 388         else
 389                 return 1;
 390 }
 391
 392 /*
 393  * defined in orangefs-cache.c
 394  */
 395 int op_cache_initialize(void);
 396 int op_cache_finalize(void);
 397 struct orangefs_kernel_op_s *op_alloc(__s32 type);
 398 void orangefs_new_tag(struct orangefs_kernel_op_s *op);
 399 char *get_opname_string(struct orangefs_kernel_op_s *new_op);
 400
 401 int orangefs_inode_cache_initialize(void);
 402 int orangefs_inode_cache_finalize(void);
 403
 404 /*
 405  * defined in orangefs-mod.c
 406  */
 407 void purge_inprogress_ops(void);
 408
 409 /*
 410  * defined in waitqueue.c
 411  */
 412 void purge_waiting_ops(void);
 413
 414 /*
 415  * defined in super.c
 416  */
 417 extern uint64_t orangefs_features;
 418
 419 struct dentry *orangefs_mount(struct file_system_type *fst,
 420                            int flags,
 421                            const char *devname,
 422                            void *data);
 423
 424 void orangefs_kill_sb(struct super_block *sb);
 425 int orangefs_remount(struct orangefs_sb_info_s *);
 426
 427 int fsid_key_table_initialize(void);
 428 void fsid_key_table_finalize(void);
 429
 430 /*
 431  * defined in inode.c
 432  */
 433 __u32 convert_to_orangefs_mask(unsigned long lite_mask);
 434 struct inode *orangefs_new_inode(struct super_block *sb,
 435                               struct inode *dir,
 436                               int mode,
 437                               dev_t dev,
 438                               struct orangefs_object_kref *ref);
 439
 440 int orangefs_setattr(struct dentry *dentry, struct iattr *iattr);
 441
 442 int orangefs_getattr(struct vfsmount *mnt,
 443                   struct dentry *dentry,
 444                   struct kstat *kstat);
 445
 446 int orangefs_permission(struct inode *inode, int mask);
 447
 448 /*
 449  * defined in xattr.c
 450  */
 451 int orangefs_setxattr(struct dentry *dentry,
 452                    const char *name,
 453                    const void *value,
 454                    size_t size,
 455                    int flags);
 456
 457 ssize_t orangefs_getxattr(struct dentry *dentry,
 458                        const char *name,
 459                        void *buffer,
 460                        size_t size);
 461
 462 ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 463
 464 /*
 465  * defined in namei.c
 466  */
 467 struct inode *orangefs_iget(struct super_block *sb,
 468                          struct orangefs_object_kref *ref);
 469
 470 ssize_t orangefs_inode_read(struct inode *inode,
 471                             struct iov_iter *iter,
 472                             loff_t *offset,
 473                             loff_t readahead_size);
 474
 475 /*
 476  * defined in devorangefs-req.c
 477  */
 478 extern uint32_t orangefs_userspace_version;
 479
 480 int orangefs_dev_init(void);
 481 void orangefs_dev_cleanup(void);
 482 int is_daemon_in_service(void);
 483 bool __is_daemon_in_service(void);
 484
 485 /*
 486  * defined in orangefs-utils.c
 487  */
 488 __s32 fsid_of_op(struct orangefs_kernel_op_s *op);
 489
 490 int orangefs_flush_inode(struct inode *inode);
 491
 492 ssize_t orangefs_inode_getxattr(struct inode *inode,
 493                              const char *name,
 494                              void *buffer,
 495                              size_t size);
 496
 497 int orangefs_inode_setxattr(struct inode *inode,
 498                          const char *name,
 499                          const void *value,
 500                          size_t size,
 501                          int flags);
 502
 503 int orangefs_inode_getattr(struct inode *inode, int new, int bypass);
 504
 505 int orangefs_inode_check_changed(struct inode *inode);
 506
 507 int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr);
 508
 509 void orangefs_make_bad_inode(struct inode *inode);
 510
 511 int orangefs_unmount_sb(struct super_block *sb);
 512
 513 bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op);
 514
 515 int orangefs_normalize_to_errno(__s32 error_code);
 516
 517 extern struct mutex orangefs_request_mutex;
 518 extern int op_timeout_secs;
 519 extern int slot_timeout_secs;
 520 extern int orangefs_dcache_timeout_msecs;
 521 extern int orangefs_getattr_timeout_msecs;
 522 extern struct list_head orangefs_superblocks;
 523 extern spinlock_t orangefs_superblocks_lock;
 524 extern struct list_head orangefs_request_list;
 525 extern spinlock_t orangefs_request_list_lock;
 526 extern wait_queue_head_t orangefs_request_list_waitq;
 527 extern struct list_head *orangefs_htable_ops_in_progress;
 528 extern spinlock_t orangefs_htable_ops_in_progress_lock;
 529 extern int hash_table_size;
 530
 531 extern const struct address_space_operations orangefs_address_operations;
 532 extern struct backing_dev_info orangefs_backing_dev_info;
 533 extern const struct inode_operations orangefs_file_inode_operations;
 534 extern const struct file_operations orangefs_file_operations;
 535 extern const struct inode_operations orangefs_symlink_inode_operations;
 536 extern const struct inode_operations orangefs_dir_inode_operations;
 537 extern const struct file_operations orangefs_dir_operations;
 538 extern const struct dentry_operations orangefs_dentry_operations;
 539 extern const struct file_operations orangefs_devreq_file_operations;
 540
 541 extern wait_queue_head_t orangefs_bufmap_init_waitq;
 542
 543 /*
 544  * misc convenience macros
 545  */
 546
 547 #define ORANGEFS_OP_INTERRUPTIBLE 1   /* service_operation() is interruptible */
 548 #define ORANGEFS_OP_PRIORITY      2   /* service_operation() is high priority */
 549 #define ORANGEFS_OP_CANCELLATION  4   /* this is a cancellation */
 550 #define ORANGEFS_OP_NO_MUTEX      8   /* don't acquire request_mutex */
 551 #define ORANGEFS_OP_ASYNC         16  /* Queue it, but don't wait */
 552
 553 int service_operation(struct orangefs_kernel_op_s *op,
 554                       const char *op_name,
 555                       int flags);
 556
 557 #define get_interruptible_flag(inode) \
 558         ((ORANGEFS_SB(inode->i_sb)->flags & ORANGEFS_OPT_INTR) ? \
 559                 ORANGEFS_OP_INTERRUPTIBLE : 0)
 560
 561 #define fill_default_sys_attrs(sys_attr, type, mode)                    \
 562 do {                                                                    \
 563         sys_attr.owner = from_kuid(&init_user_ns, current_fsuid()); \
 564         sys_attr.group = from_kgid(&init_user_ns, current_fsgid()); \
 565         sys_attr.perms = ORANGEFS_util_translate_mode(mode);            \
 566         sys_attr.mtime = 0;                                             \
 567         sys_attr.atime = 0;                                             \
 568         sys_attr.ctime = 0;                                             \
 569         sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE;                  \
 570 } while (0)
 571
 572 static inline void orangefs_i_size_write(struct inode *inode, loff_t i_size)
 573 {
 574 #if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
 575         inode_lock(inode);
 576 #endif
 577         i_size_write(inode, i_size);
 578 #if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
 579         inode_unlock(inode);
 580 #endif
 581 }
 582
 583 static inline void orangefs_set_timeout(struct dentry *dentry)
 584 {
 585         unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;
 586
 587         dentry->d_fsdata = (void *) time;
 588 }
 589
 590 #endif /* __ORANGEFSKERNEL_H */