fs/ceph/super.h

   1 #ifndef _FS_CEPH_SUPER_H
   2 #define _FS_CEPH_SUPER_H
   3
   4 #include <linux/ceph/ceph_debug.h>
   5
   6 #include <asm/unaligned.h>
   7 #include <linux/backing-dev.h>
   8 #include <linux/completion.h>
   9 #include <linux/exportfs.h>
  10 #include <linux/fs.h>
  11 #include <linux/mempool.h>
  12 #include <linux/pagemap.h>
  13 #include <linux/wait.h>
  14 #include <linux/writeback.h>
  15 #include <linux/slab.h>
  16 #include <linux/posix_acl.h>
  17
  18 #include <linux/ceph/libceph.h>
  19
  20 #ifdef CONFIG_CEPH_FSCACHE
  21 #include <linux/fscache.h>
  22 #endif
  23
  24 /* f_type in struct statfs */
  25 #define CEPH_SUPER_MAGIC 0x00c36400
  26
  27 /* large granularity for statfs utilization stats to facilitate
  28  * large volume sizes on 32-bit machines. */
  29 #define CEPH_BLOCK_SHIFT   22  /* 4 MB */
  30 #define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
  31
  32 #define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
  33 #define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
  34 #define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
  35 #define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
  36 #define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
  37 #define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
  38
  39 #define CEPH_MOUNT_OPT_DEFAULT    (CEPH_MOUNT_OPT_RBYTES)
  40
  41 #define ceph_set_mount_opt(fsc, opt) \
  42         (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
  43 #define ceph_test_mount_opt(fsc, opt) \
  44         (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
  45
  46 #define CEPH_RSIZE_DEFAULT             0           /* max read size */
  47 #define CEPH_RASIZE_DEFAULT            (8192*1024) /* readahead */
  48 #define CEPH_MAX_READDIR_DEFAULT        1024
  49 #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
  50 #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
  51
  52 struct ceph_mount_options {
  53         int flags;
  54         int sb_flags;
  55
  56         int wsize;            /* max write size */
  57         int rsize;            /* max read size */
  58         int rasize;           /* max readahead */
  59         int congestion_kb;    /* max writeback in flight */
  60         int caps_wanted_delay_min, caps_wanted_delay_max;
  61         int cap_release_safety;
  62         int max_readdir;       /* max readdir result (entires) */
  63         int max_readdir_bytes; /* max readdir result (bytes) */
  64
  65         /*
  66          * everything above this point can be memcmp'd; everything below
  67          * is handled in compare_mount_options()
  68          */
  69
  70         char *snapdir_name;   /* default ".snap" */
  71 };
  72
  73 struct ceph_fs_client {
  74         struct super_block *sb;
  75
  76         struct ceph_mount_options *mount_options;
  77         struct ceph_client *client;
  78
  79         unsigned long mount_state;
  80         int min_caps;                  /* min caps i added */
  81
  82         struct ceph_mds_client *mdsc;
  83
  84         /* writeback */
  85         mempool_t *wb_pagevec_pool;
  86         struct workqueue_struct *wb_wq;
  87         struct workqueue_struct *pg_inv_wq;
  88         struct workqueue_struct *trunc_wq;
  89         atomic_long_t writeback_count;
  90
  91         struct backing_dev_info backing_dev_info;
  92
  93 #ifdef CONFIG_DEBUG_FS
  94         struct dentry *debugfs_dentry_lru, *debugfs_caps;
  95         struct dentry *debugfs_congestion_kb;
  96         struct dentry *debugfs_bdi;
  97         struct dentry *debugfs_mdsc, *debugfs_mdsmap;
  98         struct dentry *debugfs_mds_sessions;
  99 #endif
 100
 101 #ifdef CONFIG_CEPH_FSCACHE
 102         struct fscache_cookie *fscache;
 103         struct workqueue_struct *revalidate_wq;
 104 #endif
 105 };
 106
 107
 108 /*
 109  * File i/o capability.  This tracks shared state with the metadata
 110  * server that allows us to cache or writeback attributes or to read
 111  * and write data.  For any given inode, we should have one or more
 112  * capabilities, one issued by each metadata server, and our
 113  * cumulative access is the OR of all issued capabilities.
 114  *
 115  * Each cap is referenced by the inode's i_caps rbtree and by per-mds
 116  * session capability lists.
 117  */
 118 struct ceph_cap {
 119         struct ceph_inode_info *ci;
 120         struct rb_node ci_node;          /* per-ci cap tree */
 121         struct ceph_mds_session *session;
 122         struct list_head session_caps;   /* per-session caplist */
 123         int mds;
 124         u64 cap_id;       /* unique cap id (mds provided) */
 125         int issued;       /* latest, from the mds */
 126         int implemented;  /* implemented superset of issued (for revocation) */
 127         int mds_wanted;
 128         u32 seq, issue_seq, mseq;
 129         u32 cap_gen;      /* active/stale cycle */
 130         unsigned long last_used;
 131         struct list_head caps_item;
 132 };
 133
 134 #define CHECK_CAPS_NODELAY    1  /* do not delay any further */
 135 #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
 136 #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
 137
 138 /*
 139  * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
 140  * we first complete any in-process sync writes and writeback any dirty
 141  * data before flushing the snapped state (tracked here) back to the MDS.
 142  */
 143 struct ceph_cap_snap {
 144         atomic_t nref;
 145         struct ceph_inode_info *ci;
 146         struct list_head ci_item, flushing_item;
 147
 148         u64 follows, flush_tid;
 149         int issued, dirty;
 150         struct ceph_snap_context *context;
 151
 152         umode_t mode;
 153         kuid_t uid;
 154         kgid_t gid;
 155
 156         struct ceph_buffer *xattr_blob;
 157         u64 xattr_version;
 158
 159         u64 size;
 160         struct timespec mtime, atime, ctime;
 161         u64 time_warp_seq;
 162         int writing;   /* a sync write is still in progress */
 163         int dirty_pages;     /* dirty pages awaiting writeback */
 164         bool inline_data;
 165 };
 166
 167 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 168 {
 169         if (atomic_dec_and_test(&capsnap->nref)) {
 170                 if (capsnap->xattr_blob)
 171                         ceph_buffer_put(capsnap->xattr_blob);
 172                 kfree(capsnap);
 173         }
 174 }
 175
 176 /*
 177  * The frag tree describes how a directory is fragmented, potentially across
 178  * multiple metadata servers.  It is also used to indicate points where
 179  * metadata authority is delegated, and whether/where metadata is replicated.
 180  *
 181  * A _leaf_ frag will be present in the i_fragtree IFF there is
 182  * delegation info.  That is, if mds >= 0 || ndist > 0.
 183  */
 184 #define CEPH_MAX_DIRFRAG_REP 4
 185
 186 struct ceph_inode_frag {
 187         struct rb_node node;
 188
 189         /* fragtree state */
 190         u32 frag;
 191         int split_by;         /* i.e. 2^(split_by) children */
 192
 193         /* delegation and replication info */
 194         int mds;              /* -1 if same authority as parent */
 195         int ndist;            /* >0 if replicated */
 196         int dist[CEPH_MAX_DIRFRAG_REP];
 197 };
 198
 199 /*
 200  * We cache inode xattrs as an encoded blob until they are first used,
 201  * at which point we parse them into an rbtree.
 202  */
 203 struct ceph_inode_xattr {
 204         struct rb_node node;
 205
 206         const char *name;
 207         int name_len;
 208         const char *val;
 209         int val_len;
 210         int dirty;
 211
 212         int should_free_name;
 213         int should_free_val;
 214 };
 215
 216 /*
 217  * Ceph dentry state
 218  */
 219 struct ceph_dentry_info {
 220         struct ceph_mds_session *lease_session;
 221         u32 lease_gen, lease_shared_gen;
 222         u32 lease_seq;
 223         unsigned long lease_renew_after, lease_renew_from;
 224         struct list_head lru;
 225         struct dentry *dentry;
 226         u64 time;
 227         u64 offset;
 228 };
 229
 230 struct ceph_inode_xattrs_info {
 231         /*
 232          * (still encoded) xattr blob. we avoid the overhead of parsing
 233          * this until someone actually calls getxattr, etc.
 234          *
 235          * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
 236          * NULL means we don't know.
 237         */
 238         struct ceph_buffer *blob, *prealloc_blob;
 239
 240         struct rb_root index;
 241         bool dirty;
 242         int count;
 243         int names_size;
 244         int vals_size;
 245         u64 version, index_version;
 246 };
 247
 248 /*
 249  * Ceph inode.
 250  */
 251 struct ceph_inode_info {
 252         struct ceph_vino i_vino;   /* ceph ino + snap */
 253
 254         spinlock_t i_ceph_lock;
 255
 256         u64 i_version;
 257         u64 i_inline_version;
 258         u32 i_time_warp_seq;
 259
 260         unsigned i_ceph_flags;
 261         int i_ordered_count;
 262         atomic_t i_release_count;
 263         atomic_t i_complete_count;
 264
 265         struct ceph_dir_layout i_dir_layout;
 266         struct ceph_file_layout i_layout;
 267         char *i_symlink;
 268
 269         /* for dirs */
 270         struct timespec i_rctime;
 271         u64 i_rbytes, i_rfiles, i_rsubdirs;
 272         u64 i_files, i_subdirs;
 273
 274         struct rb_root i_fragtree;
 275         struct mutex i_fragtree_mutex;
 276
 277         struct ceph_inode_xattrs_info i_xattrs;
 278
 279         /* capabilities.  protected _both_ by i_ceph_lock and cap->session's
 280          * s_mutex. */
 281         struct rb_root i_caps;           /* cap list */
 282         struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
 283         unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
 284         struct list_head i_dirty_item, i_flushing_item;
 285         u64 i_cap_flush_seq;
 286         /* we need to track cap writeback on a per-cap-bit basis, to allow
 287          * overlapping, pipelined cap flushes to the mds.  we can probably
 288          * reduce the tid to 8 bits if we're concerned about inode size. */
 289         u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
 290         wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
 291         unsigned long i_hold_caps_min; /* jiffies */
 292         unsigned long i_hold_caps_max; /* jiffies */
 293         struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
 294         struct ceph_cap_reservation i_cap_migration_resv;
 295         struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
 296         struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
 297                                                     dirty|flushing caps */
 298         unsigned i_snap_caps;           /* cap bits for snapped files */
 299
 300         int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
 301
 302         struct mutex i_truncate_mutex;
 303         u32 i_truncate_seq;        /* last truncate to smaller size */
 304         u64 i_truncate_size;       /*  and the size we last truncated down to */
 305         int i_truncate_pending;    /*  still need to call vmtruncate */
 306
 307         u64 i_max_size;            /* max file size authorized by mds */
 308         u64 i_reported_size; /* (max_)size reported to or requested of mds */
 309         u64 i_wanted_max_size;     /* offset we'd like to write too */
 310         u64 i_requested_max_size;  /* max_size we've requested */
 311
 312         /* held references to caps */
 313         int i_pin_ref;
 314         int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
 315         int i_wrbuffer_ref, i_wrbuffer_ref_head;
 316         u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 317         u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
 318         u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
 319
 320         struct list_head i_unsafe_writes; /* uncommitted sync writes */
 321         struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 322         spinlock_t i_unsafe_lock;
 323
 324         struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
 325         int i_snap_realm_counter; /* snap realm (if caps) */
 326         struct list_head i_snap_realm_item;
 327         struct list_head i_snap_flush_item;
 328
 329         struct work_struct i_wb_work;  /* writeback work */
 330         struct work_struct i_pg_inv_work;  /* page invalidation work */
 331
 332         struct work_struct i_vmtruncate_work;
 333
 334 #ifdef CONFIG_CEPH_FSCACHE
 335         struct fscache_cookie *fscache;
 336         u32 i_fscache_gen; /* sequence, for delayed fscache validate */
 337         struct work_struct i_revalidate_work;
 338 #endif
 339         struct inode vfs_inode; /* at end */
 340 };
 341
 342 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
 343 {
 344         return container_of(inode, struct ceph_inode_info, vfs_inode);
 345 }
 346
 347 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
 348 {
 349         return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
 350 }
 351
 352 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
 353 {
 354         return (struct ceph_fs_client *)sb->s_fs_info;
 355 }
 356
 357 static inline struct ceph_vino ceph_vino(struct inode *inode)
 358 {
 359         return ceph_inode(inode)->i_vino;
 360 }
 361
 362 /*
 363  * ino_t is <64 bits on many architectures, blech.
 364  *
 365  *               i_ino (kernel inode)   st_ino (userspace)
 366  * i386          32                     32
 367  * x86_64+ino32  64                     32
 368  * x86_64        64                     64
 369  */
 370 static inline u32 ceph_ino_to_ino32(__u64 vino)
 371 {
 372         u32 ino = vino & 0xffffffff;
 373         ino ^= vino >> 32;
 374         if (!ino)
 375                 ino = 2;
 376         return ino;
 377 }
 378
 379 /*
 380  * kernel i_ino value
 381  */
 382 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
 383 {
 384 #if BITS_PER_LONG == 32
 385         return ceph_ino_to_ino32(vino.ino);
 386 #else
 387         return (ino_t)vino.ino;
 388 #endif
 389 }
 390
 391 /*
 392  * user-visible ino (stat, filldir)
 393  */
 394 #if BITS_PER_LONG == 32
 395 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 396 {
 397         return ino;
 398 }
 399 #else
 400 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 401 {
 402         if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
 403                 ino = ceph_ino_to_ino32(ino);
 404         return ino;
 405 }
 406 #endif
 407
 408
 409 /* for printf-style formatting */
 410 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
 411
 412 static inline u64 ceph_ino(struct inode *inode)
 413 {
 414         return ceph_inode(inode)->i_vino.ino;
 415 }
 416 static inline u64 ceph_snap(struct inode *inode)
 417 {
 418         return ceph_inode(inode)->i_vino.snap;
 419 }
 420
 421 static inline int ceph_ino_compare(struct inode *inode, void *data)
 422 {
 423         struct ceph_vino *pvino = (struct ceph_vino *)data;
 424         struct ceph_inode_info *ci = ceph_inode(inode);
 425         return ci->i_vino.ino == pvino->ino &&
 426                 ci->i_vino.snap == pvino->snap;
 427 }
 428
 429 static inline struct inode *ceph_find_inode(struct super_block *sb,
 430                                             struct ceph_vino vino)
 431 {
 432         ino_t t = ceph_vino_to_ino(vino);
 433         return ilookup5(sb, t, ceph_ino_compare, &vino);
 434 }
 435
 436
 437 /*
 438  * Ceph inode.
 439  */
 440 #define CEPH_I_DIR_ORDERED      1  /* dentries in dir are ordered */
 441 #define CEPH_I_NODELAY          4  /* do not delay cap release */
 442 #define CEPH_I_FLUSH            8  /* do not delay flush of dirty metadata */
 443 #define CEPH_I_NOFLUSH          16 /* do not flush dirty caps */
 444
 445 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
 446                                            int release_count, int ordered_count)
 447 {
 448         atomic_set(&ci->i_complete_count, release_count);
 449         if (ci->i_ordered_count == ordered_count)
 450                 ci->i_ceph_flags |= CEPH_I_DIR_ORDERED;
 451         else
 452                 ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED;
 453 }
 454
 455 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
 456 {
 457         atomic_inc(&ci->i_release_count);
 458 }
 459
 460 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
 461 {
 462         return atomic_read(&ci->i_complete_count) ==
 463                 atomic_read(&ci->i_release_count);
 464 }
 465
 466 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
 467 {
 468         return __ceph_dir_is_complete(ci) &&
 469                 (ci->i_ceph_flags & CEPH_I_DIR_ORDERED);
 470 }
 471
 472 static inline void ceph_dir_clear_complete(struct inode *inode)
 473 {
 474         __ceph_dir_clear_complete(ceph_inode(inode));
 475 }
 476
 477 static inline void ceph_dir_clear_ordered(struct inode *inode)
 478 {
 479         struct ceph_inode_info *ci = ceph_inode(inode);
 480         spin_lock(&ci->i_ceph_lock);
 481         ci->i_ordered_count++;
 482         ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED;
 483         spin_unlock(&ci->i_ceph_lock);
 484 }
 485
 486 static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
 487 {
 488         struct ceph_inode_info *ci = ceph_inode(inode);
 489         bool ret;
 490         spin_lock(&ci->i_ceph_lock);
 491         ret = __ceph_dir_is_complete_ordered(ci);
 492         spin_unlock(&ci->i_ceph_lock);
 493         return ret;
 494 }
 495
 496 /* find a specific frag @f */
 497 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
 498                                                 u32 f);
 499
 500 /*
 501  * choose fragment for value @v.  copy frag content to pfrag, if leaf
 502  * exists
 503  */
 504 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 505                             struct ceph_inode_frag *pfrag,
 506                             int *found);
 507
 508 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
 509 {
 510         return (struct ceph_dentry_info *)dentry->d_fsdata;
 511 }
 512
 513 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
 514 {
 515         return ((loff_t)frag << 32) | (loff_t)off;
 516 }
 517
 518 /*
 519  * caps helpers
 520  */
 521 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
 522 {
 523         return !RB_EMPTY_ROOT(&ci->i_caps);
 524 }
 525
 526 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
 527 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
 528 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
 529                                     struct ceph_cap *cap);
 530
 531 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
 532 {
 533         int issued;
 534         spin_lock(&ci->i_ceph_lock);
 535         issued = __ceph_caps_issued(ci, NULL);
 536         spin_unlock(&ci->i_ceph_lock);
 537         return issued;
 538 }
 539
 540 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
 541                                         int touch)
 542 {
 543         int r;
 544         spin_lock(&ci->i_ceph_lock);
 545         r = __ceph_caps_issued_mask(ci, mask, touch);
 546         spin_unlock(&ci->i_ceph_lock);
 547         return r;
 548 }
 549
 550 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
 551 {
 552         return ci->i_dirty_caps | ci->i_flushing_caps;
 553 }
 554 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
 555
 556 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
 557                                       struct ceph_cap *ocap, int mask);
 558 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 559 extern int __ceph_caps_used(struct ceph_inode_info *ci);
 560
 561 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
 562
 563 /*
 564  * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
 565  */
 566 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
 567 {
 568         int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
 569         if (w & CEPH_CAP_FILE_BUFFER)
 570                 w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
 571         return w;
 572 }
 573
 574 /* what the mds thinks we want */
 575 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
 576
 577 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
 578 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
 579 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
 580 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
 581                              struct ceph_cap_reservation *ctx, int need);
 582 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
 583                                struct ceph_cap_reservation *ctx);
 584 extern void ceph_reservation_status(struct ceph_fs_client *client,
 585                                     int *total, int *avail, int *used,
 586                                     int *reserved, int *min);
 587
 588
 589
 590 /*
 591  * we keep buffered readdir results attached to file->private_data
 592  */
 593 #define CEPH_F_SYNC     1
 594 #define CEPH_F_ATEND    2
 595
 596 struct ceph_file_info {
 597         short fmode;     /* initialized on open */
 598         short flags;     /* CEPH_F_* */
 599
 600         /* readdir: position within the dir */
 601         u32 frag;
 602         struct ceph_mds_request *last_readdir;
 603
 604         /* readdir: position within a frag */
 605         unsigned offset;       /* offset of last chunk, adjusted for . and .. */
 606         unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
 607         char *last_name;       /* last entry in previous chunk */
 608         struct dentry *dentry; /* next dentry (for dcache readdir) */
 609         int dir_release_count;
 610         int dir_ordered_count;
 611
 612         /* used for -o dirstat read() on directory thing */
 613         char *dir_info;
 614         int dir_info_len;
 615 };
 616
 617
 618
 619 /*
 620  * A "snap realm" describes a subset of the file hierarchy sharing
 621  * the same set of snapshots that apply to it.  The realms themselves
 622  * are organized into a hierarchy, such that children inherit (some of)
 623  * the snapshots of their parents.
 624  *
 625  * All inodes within the realm that have capabilities are linked into a
 626  * per-realm list.
 627  */
 628 struct ceph_snap_realm {
 629         u64 ino;
 630         atomic_t nref;
 631         struct rb_node node;
 632
 633         u64 created, seq;
 634         u64 parent_ino;
 635         u64 parent_since;   /* snapid when our current parent became so */
 636
 637         u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
 638         u32 num_prior_parent_snaps;   /*  had prior to parent_since */
 639         u64 *snaps;                   /* snaps specific to this realm */
 640         u32 num_snaps;
 641
 642         struct ceph_snap_realm *parent;
 643         struct list_head children;       /* list of child realms */
 644         struct list_head child_item;
 645
 646         struct list_head empty_item;     /* if i have ref==0 */
 647
 648         struct list_head dirty_item;     /* if realm needs new context */
 649
 650         /* the current set of snaps for this realm */
 651         struct ceph_snap_context *cached_context;
 652
 653         struct list_head inodes_with_caps;
 654         spinlock_t inodes_with_caps_lock;
 655 };
 656
 657 static inline int default_congestion_kb(void)
 658 {
 659         int congestion_kb;
 660
 661         /*
 662          * Copied from NFS
 663          *
 664          * congestion size, scale with available memory.
 665          *
 666          *  64MB:    8192k
 667          * 128MB:   11585k
 668          * 256MB:   16384k
 669          * 512MB:   23170k
 670          *   1GB:   32768k
 671          *   2GB:   46340k
 672          *   4GB:   65536k
 673          *   8GB:   92681k
 674          *  16GB:  131072k
 675          *
 676          * This allows larger machines to have larger/more transfers.
 677          * Limit the default to 256M
 678          */
 679         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 680         if (congestion_kb > 256*1024)
 681                 congestion_kb = 256*1024;
 682
 683         return congestion_kb;
 684 }
 685
 686
 687
 688 /* snap.c */
 689 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
 690                                                u64 ino);
 691 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
 692                                 struct ceph_snap_realm *realm);
 693 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
 694                                 struct ceph_snap_realm *realm);
 695 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
 696                                   void *p, void *e, bool deletion,
 697                                   struct ceph_snap_realm **realm_ret);
 698 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
 699                              struct ceph_mds_session *session,
 700                              struct ceph_msg *msg);
 701 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
 702 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 703                                   struct ceph_cap_snap *capsnap);
 704 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
 705 extern int ceph_snap_init(void);
 706 extern void ceph_snap_exit(void);
 707
 708 /*
 709  * a cap_snap is "pending" if it is still awaiting an in-progress
 710  * sync write (that may/may not still update size, mtime, etc.).
 711  */
 712 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
 713 {
 714         return !list_empty(&ci->i_cap_snaps) &&
 715                 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
 716                            ci_item)->writing;
 717 }
 718
 719 /* inode.c */
 720 extern const struct inode_operations ceph_file_iops;
 721
 722 extern struct inode *ceph_alloc_inode(struct super_block *sb);
 723 extern void ceph_destroy_inode(struct inode *inode);
 724 extern int ceph_drop_inode(struct inode *inode);
 725
 726 extern struct inode *ceph_get_inode(struct super_block *sb,
 727                                     struct ceph_vino vino);
 728 extern struct inode *ceph_get_snapdir(struct inode *parent);
 729 extern int ceph_fill_file_size(struct inode *inode, int issued,
 730                                u32 truncate_seq, u64 truncate_size, u64 size);
 731 extern void ceph_fill_file_time(struct inode *inode, int issued,
 732                                 u64 time_warp_seq, struct timespec *ctime,
 733                                 struct timespec *mtime, struct timespec *atime);
 734 extern int ceph_fill_trace(struct super_block *sb,
 735                            struct ceph_mds_request *req,
 736                            struct ceph_mds_session *session);
 737 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 738                                     struct ceph_mds_session *session);
 739
 740 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
 741
 742 extern int ceph_inode_set_size(struct inode *inode, loff_t size);
 743 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
 744 extern void ceph_queue_vmtruncate(struct inode *inode);
 745
 746 extern void ceph_queue_invalidate(struct inode *inode);
 747 extern void ceph_queue_writeback(struct inode *inode);
 748
 749 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
 750                              int mask, bool force);
 751 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
 752 {
 753         return __ceph_do_getattr(inode, NULL, mask, force);
 754 }
 755 extern int ceph_permission(struct inode *inode, int mask);
 756 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 757 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
 758                         struct kstat *stat);
 759
 760 /* xattr.c */
 761 extern int ceph_setxattr(struct dentry *, const char *, const void *,
 762                          size_t, int);
 763 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
 764 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
 765 int __ceph_removexattr(struct dentry *, const char *);
 766 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
 767 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 768 extern int ceph_removexattr(struct dentry *, const char *);
 769 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 770 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 771 extern void __init ceph_xattr_init(void);
 772 extern void ceph_xattr_exit(void);
 773 extern const struct xattr_handler *ceph_xattr_handlers[];
 774
 775 /* acl.c */
 776 struct ceph_acls_info {
 777         void *default_acl;
 778         void *acl;
 779         struct ceph_pagelist *pagelist;
 780 };
 781
 782 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 783
 784 struct posix_acl *ceph_get_acl(struct inode *, int);
 785 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 786 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 787                        struct ceph_acls_info *info);
 788 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
 789 void ceph_release_acls_info(struct ceph_acls_info *info);
 790
 791 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 792 {
 793        forget_all_cached_acls(inode);
 794 }
 795
 796 #else
 797
 798 #define ceph_get_acl NULL
 799 #define ceph_set_acl NULL
 800
 801 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 802                                      struct ceph_acls_info *info)
 803 {
 804         return 0;
 805 }
 806 static inline void ceph_init_inode_acls(struct inode *inode,
 807                                         struct ceph_acls_info *info)
 808 {
 809 }
 810 static inline void ceph_release_acls_info(struct ceph_acls_info *info)
 811 {
 812 }
 813 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
 814 {
 815         return 0;
 816 }
 817
 818 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 819 {
 820 }
 821
 822 #endif
 823
 824 /* caps.c */
 825 extern const char *ceph_cap_string(int c);
 826 extern void ceph_handle_caps(struct ceph_mds_session *session,
 827                              struct ceph_msg *msg);
 828 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
 829                                      struct ceph_cap_reservation *ctx);
 830 extern void ceph_add_cap(struct inode *inode,
 831                          struct ceph_mds_session *session, u64 cap_id,
 832                          int fmode, unsigned issued, unsigned wanted,
 833                          unsigned cap, unsigned seq, u64 realmino, int flags,
 834                          struct ceph_cap **new_cap);
 835 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 836 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
 837                          struct ceph_cap *cap);
 838 extern int ceph_is_any_caps(struct inode *inode);
 839
 840 extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino,
 841                                 u64 cap_id, u32 migrate_seq, u32 issue_seq);
 842 extern void ceph_queue_caps_release(struct inode *inode);
 843 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
 844 extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
 845                       int datasync);
 846 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
 847                                     struct ceph_mds_session *session);
 848 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
 849                                              int mds);
 850 extern int ceph_get_cap_mds(struct inode *inode);
 851 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
 852 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 853 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 854                                        struct ceph_snap_context *snapc);
 855 extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
 856                                struct ceph_mds_session **psession,
 857                                int again);
 858 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 859                             struct ceph_mds_session *session);
 860 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 861 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
 862
 863 extern int ceph_encode_inode_release(void **p, struct inode *inode,
 864                                      int mds, int drop, int unless, int force);
 865 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 866                                       int mds, int drop, int unless);
 867
 868 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 869                          loff_t endoff, int *got, struct page **pinned_page);
 870
 871 /* for counting open files by mode */
 872 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
 873 {
 874         ci->i_nr_by_mode[mode]++;
 875 }
 876 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
 877
 878 /* addr.c */
 879 extern const struct address_space_operations ceph_aops;
 880 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 881
 882 /* file.c */
 883 extern const struct file_operations ceph_file_fops;
 884 extern const struct address_space_operations ceph_aops;
 885
 886 extern int ceph_open(struct inode *inode, struct file *file);
 887 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 888                             struct file *file, unsigned flags, umode_t mode,
 889                             int *opened);
 890 extern int ceph_release(struct inode *inode, struct file *filp);
 891 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
 892                                   char *data, size_t len);
 893 int ceph_uninline_data(struct file *filp, struct page *locked_page);
 894 /* dir.c */
 895 extern const struct file_operations ceph_dir_fops;
 896 extern const struct file_operations ceph_snapdir_fops;
 897 extern const struct inode_operations ceph_dir_iops;
 898 extern const struct inode_operations ceph_snapdir_iops;
 899 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
 900         ceph_snapdir_dentry_ops;
 901
 902 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
 903 extern int ceph_handle_snapdir(struct ceph_mds_request *req,
 904                                struct dentry *dentry, int err);
 905 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 906                                          struct dentry *dentry, int err);
 907
 908 extern void ceph_dentry_lru_add(struct dentry *dn);
 909 extern void ceph_dentry_lru_touch(struct dentry *dn);
 910 extern void ceph_dentry_lru_del(struct dentry *dn);
 911 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 912 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
 913 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
 914
 915 /*
 916  * our d_ops vary depending on whether the inode is live,
 917  * snapshotted (read-only), or a virtual ".snap" directory.
 918  */
 919 int ceph_init_dentry(struct dentry *dentry);
 920
 921
 922 /* ioctl.c */
 923 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 924
 925 /* export.c */
 926 extern const struct export_operations ceph_export_ops;
 927
 928 /* locks.c */
 929 extern __init void ceph_flock_init(void);
 930 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
 931 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
 932 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
 933 extern int ceph_encode_locks_to_buffer(struct inode *inode,
 934                                        struct ceph_filelock *flocks,
 935                                        int num_fcntl_locks,
 936                                        int num_flock_locks);
 937 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
 938                                   struct ceph_pagelist *pagelist,
 939                                   int num_fcntl_locks, int num_flock_locks);
 940 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
 941
 942 /* debugfs.c */
 943 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
 944 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 945
 946 #endif /* _FS_CEPH_SUPER_H */