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