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 #define CEPH_MOUNT_OPT_NOPOOLPERM      (1<<11) /* no pool permission check */
  39
  40 #define CEPH_MOUNT_OPT_DEFAULT    (CEPH_MOUNT_OPT_RBYTES | \
  41                                    CEPH_MOUNT_OPT_DCACHE)
  42
  43 #define ceph_set_mount_opt(fsc, opt) \
  44         (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
  45 #define ceph_test_mount_opt(fsc, opt) \
  46         (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
  47
  48 #define CEPH_RSIZE_DEFAULT             0           /* max read size */
  49 #define CEPH_RASIZE_DEFAULT            (8192*1024) /* readahead */
  50 #define CEPH_MAX_READDIR_DEFAULT        1024
  51 #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
  52 #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
  53
  54 struct ceph_mount_options {
  55         int flags;
  56         int sb_flags;
  57
  58         int wsize;            /* max write size */
  59         int rsize;            /* max read size */
  60         int rasize;           /* max readahead */
  61         int congestion_kb;    /* max writeback in flight */
  62         int caps_wanted_delay_min, caps_wanted_delay_max;
  63         int cap_release_safety;
  64         int max_readdir;       /* max readdir result (entires) */
  65         int max_readdir_bytes; /* max readdir result (bytes) */
  66
  67         /*
  68          * everything above this point can be memcmp'd; everything below
  69          * is handled in compare_mount_options()
  70          */
  71
  72         char *snapdir_name;   /* default ".snap" */
  73 };
  74
  75 struct ceph_fs_client {
  76         struct super_block *sb;
  77
  78         struct ceph_mount_options *mount_options;
  79         struct ceph_client *client;
  80
  81         unsigned long mount_state;
  82         int min_caps;                  /* min caps i added */
  83
  84         struct ceph_mds_client *mdsc;
  85
  86         /* writeback */
  87         mempool_t *wb_pagevec_pool;
  88         struct workqueue_struct *wb_wq;
  89         struct workqueue_struct *pg_inv_wq;
  90         struct workqueue_struct *trunc_wq;
  91         atomic_long_t writeback_count;
  92
  93         struct backing_dev_info backing_dev_info;
  94
  95 #ifdef CONFIG_DEBUG_FS
  96         struct dentry *debugfs_dentry_lru, *debugfs_caps;
  97         struct dentry *debugfs_congestion_kb;
  98         struct dentry *debugfs_bdi;
  99         struct dentry *debugfs_mdsc, *debugfs_mdsmap;
 100         struct dentry *debugfs_mds_sessions;
 101 #endif
 102
 103 #ifdef CONFIG_CEPH_FSCACHE
 104         struct fscache_cookie *fscache;
 105         struct workqueue_struct *revalidate_wq;
 106 #endif
 107 };
 108
 109
 110 /*
 111  * File i/o capability.  This tracks shared state with the metadata
 112  * server that allows us to cache or writeback attributes or to read
 113  * and write data.  For any given inode, we should have one or more
 114  * capabilities, one issued by each metadata server, and our
 115  * cumulative access is the OR of all issued capabilities.
 116  *
 117  * Each cap is referenced by the inode's i_caps rbtree and by per-mds
 118  * session capability lists.
 119  */
 120 struct ceph_cap {
 121         struct ceph_inode_info *ci;
 122         struct rb_node ci_node;          /* per-ci cap tree */
 123         struct ceph_mds_session *session;
 124         struct list_head session_caps;   /* per-session caplist */
 125         u64 cap_id;       /* unique cap id (mds provided) */
 126         union {
 127                 /* in-use caps */
 128                 struct {
 129                         int issued;       /* latest, from the mds */
 130                         int implemented;  /* implemented superset of
 131                                              issued (for revocation) */
 132                         int mds, mds_wanted;
 133                 };
 134                 /* caps to release */
 135                 struct {
 136                         u64 cap_ino;
 137                         int queue_release;
 138                 };
 139         };
 140         u32 seq, issue_seq, mseq;
 141         u32 cap_gen;      /* active/stale cycle */
 142         unsigned long last_used;
 143         struct list_head caps_item;
 144 };
 145
 146 #define CHECK_CAPS_NODELAY    1  /* do not delay any further */
 147 #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
 148 #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
 149
 150 /*
 151  * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
 152  * we first complete any in-process sync writes and writeback any dirty
 153  * data before flushing the snapped state (tracked here) back to the MDS.
 154  */
 155 struct ceph_cap_snap {
 156         atomic_t nref;
 157         struct ceph_inode_info *ci;
 158         struct list_head ci_item, flushing_item;
 159
 160         u64 follows, flush_tid;
 161         int issued, dirty;
 162         struct ceph_snap_context *context;
 163
 164         umode_t mode;
 165         kuid_t uid;
 166         kgid_t gid;
 167
 168         struct ceph_buffer *xattr_blob;
 169         u64 xattr_version;
 170
 171         u64 size;
 172         struct timespec mtime, atime, ctime;
 173         u64 time_warp_seq;
 174         int writing;   /* a sync write is still in progress */
 175         int dirty_pages;     /* dirty pages awaiting writeback */
 176         bool inline_data;
 177         bool need_flush;
 178 };
 179
 180 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
 181 {
 182         if (atomic_dec_and_test(&capsnap->nref)) {
 183                 if (capsnap->xattr_blob)
 184                         ceph_buffer_put(capsnap->xattr_blob);
 185                 kfree(capsnap);
 186         }
 187 }
 188
 189 struct ceph_cap_flush {
 190         u64 tid;
 191         int caps;
 192         struct rb_node g_node; // global
 193         union {
 194                 struct rb_node i_node; // inode
 195                 struct list_head list;
 196         };
 197 };
 198
 199 /*
 200  * The frag tree describes how a directory is fragmented, potentially across
 201  * multiple metadata servers.  It is also used to indicate points where
 202  * metadata authority is delegated, and whether/where metadata is replicated.
 203  *
 204  * A _leaf_ frag will be present in the i_fragtree IFF there is
 205  * delegation info.  That is, if mds >= 0 || ndist > 0.
 206  */
 207 #define CEPH_MAX_DIRFRAG_REP 4
 208
 209 struct ceph_inode_frag {
 210         struct rb_node node;
 211
 212         /* fragtree state */
 213         u32 frag;
 214         int split_by;         /* i.e. 2^(split_by) children */
 215
 216         /* delegation and replication info */
 217         int mds;              /* -1 if same authority as parent */
 218         int ndist;            /* >0 if replicated */
 219         int dist[CEPH_MAX_DIRFRAG_REP];
 220 };
 221
 222 /*
 223  * We cache inode xattrs as an encoded blob until they are first used,
 224  * at which point we parse them into an rbtree.
 225  */
 226 struct ceph_inode_xattr {
 227         struct rb_node node;
 228
 229         const char *name;
 230         int name_len;
 231         const char *val;
 232         int val_len;
 233         int dirty;
 234
 235         int should_free_name;
 236         int should_free_val;
 237 };
 238
 239 /*
 240  * Ceph dentry state
 241  */
 242 struct ceph_dentry_info {
 243         struct ceph_mds_session *lease_session;
 244         u32 lease_gen, lease_shared_gen;
 245         u32 lease_seq;
 246         unsigned long lease_renew_after, lease_renew_from;
 247         struct list_head lru;
 248         struct dentry *dentry;
 249         u64 time;
 250         u64 offset;
 251 };
 252
 253 struct ceph_inode_xattrs_info {
 254         /*
 255          * (still encoded) xattr blob. we avoid the overhead of parsing
 256          * this until someone actually calls getxattr, etc.
 257          *
 258          * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
 259          * NULL means we don't know.
 260         */
 261         struct ceph_buffer *blob, *prealloc_blob;
 262
 263         struct rb_root index;
 264         bool dirty;
 265         int count;
 266         int names_size;
 267         int vals_size;
 268         u64 version, index_version;
 269 };
 270
 271 /*
 272  * Ceph inode.
 273  */
 274 struct ceph_inode_info {
 275         struct ceph_vino i_vino;   /* ceph ino + snap */
 276
 277         spinlock_t i_ceph_lock;
 278
 279         u64 i_version;
 280         u64 i_inline_version;
 281         u32 i_time_warp_seq;
 282
 283         unsigned i_ceph_flags;
 284         atomic64_t i_release_count;
 285         atomic64_t i_ordered_count;
 286         atomic64_t i_complete_seq[2];
 287
 288         struct ceph_dir_layout i_dir_layout;
 289         struct ceph_file_layout i_layout;
 290         char *i_symlink;
 291
 292         /* for dirs */
 293         struct timespec i_rctime;
 294         u64 i_rbytes, i_rfiles, i_rsubdirs;
 295         u64 i_files, i_subdirs;
 296
 297         struct rb_root i_fragtree;
 298         struct mutex i_fragtree_mutex;
 299
 300         struct ceph_inode_xattrs_info i_xattrs;
 301
 302         /* capabilities.  protected _both_ by i_ceph_lock and cap->session's
 303          * s_mutex. */
 304         struct rb_root i_caps;           /* cap list */
 305         struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
 306         unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
 307         struct list_head i_dirty_item, i_flushing_item;
 308         /* we need to track cap writeback on a per-cap-bit basis, to allow
 309          * overlapping, pipelined cap flushes to the mds.  we can probably
 310          * reduce the tid to 8 bits if we're concerned about inode size. */
 311         struct ceph_cap_flush *i_prealloc_cap_flush;
 312         struct rb_root i_cap_flush_tree;
 313         wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
 314         unsigned long i_hold_caps_min; /* jiffies */
 315         unsigned long i_hold_caps_max; /* jiffies */
 316         struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
 317         struct ceph_cap_reservation i_cap_migration_resv;
 318         struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
 319         struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
 320                                                     dirty|flushing caps */
 321         unsigned i_snap_caps;           /* cap bits for snapped files */
 322
 323         int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
 324
 325         struct mutex i_truncate_mutex;
 326         u32 i_truncate_seq;        /* last truncate to smaller size */
 327         u64 i_truncate_size;       /*  and the size we last truncated down to */
 328         int i_truncate_pending;    /*  still need to call vmtruncate */
 329
 330         u64 i_max_size;            /* max file size authorized by mds */
 331         u64 i_reported_size; /* (max_)size reported to or requested of mds */
 332         u64 i_wanted_max_size;     /* offset we'd like to write too */
 333         u64 i_requested_max_size;  /* max_size we've requested */
 334
 335         /* held references to caps */
 336         int i_pin_ref;
 337         int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
 338         int i_wrbuffer_ref, i_wrbuffer_ref_head;
 339         u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 340         u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
 341         u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
 342
 343         struct list_head i_unsafe_writes; /* uncommitted sync writes */
 344         struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 345         struct list_head i_unsafe_iops;   /* uncommitted mds inode ops */
 346         spinlock_t i_unsafe_lock;
 347
 348         struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
 349         int i_snap_realm_counter; /* snap realm (if caps) */
 350         struct list_head i_snap_realm_item;
 351         struct list_head i_snap_flush_item;
 352
 353         struct work_struct i_wb_work;  /* writeback work */
 354         struct work_struct i_pg_inv_work;  /* page invalidation work */
 355
 356         struct work_struct i_vmtruncate_work;
 357
 358 #ifdef CONFIG_CEPH_FSCACHE
 359         struct fscache_cookie *fscache;
 360         u32 i_fscache_gen; /* sequence, for delayed fscache validate */
 361         struct work_struct i_revalidate_work;
 362 #endif
 363         struct inode vfs_inode; /* at end */
 364 };
 365
 366 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
 367 {
 368         return container_of(inode, struct ceph_inode_info, vfs_inode);
 369 }
 370
 371 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
 372 {
 373         return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
 374 }
 375
 376 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
 377 {
 378         return (struct ceph_fs_client *)sb->s_fs_info;
 379 }
 380
 381 static inline struct ceph_vino ceph_vino(struct inode *inode)
 382 {
 383         return ceph_inode(inode)->i_vino;
 384 }
 385
 386 /*
 387  * ino_t is <64 bits on many architectures, blech.
 388  *
 389  *               i_ino (kernel inode)   st_ino (userspace)
 390  * i386          32                     32
 391  * x86_64+ino32  64                     32
 392  * x86_64        64                     64
 393  */
 394 static inline u32 ceph_ino_to_ino32(__u64 vino)
 395 {
 396         u32 ino = vino & 0xffffffff;
 397         ino ^= vino >> 32;
 398         if (!ino)
 399                 ino = 2;
 400         return ino;
 401 }
 402
 403 /*
 404  * kernel i_ino value
 405  */
 406 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
 407 {
 408 #if BITS_PER_LONG == 32
 409         return ceph_ino_to_ino32(vino.ino);
 410 #else
 411         return (ino_t)vino.ino;
 412 #endif
 413 }
 414
 415 /*
 416  * user-visible ino (stat, filldir)
 417  */
 418 #if BITS_PER_LONG == 32
 419 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 420 {
 421         return ino;
 422 }
 423 #else
 424 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 425 {
 426         if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
 427                 ino = ceph_ino_to_ino32(ino);
 428         return ino;
 429 }
 430 #endif
 431
 432
 433 /* for printf-style formatting */
 434 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
 435
 436 static inline u64 ceph_ino(struct inode *inode)
 437 {
 438         return ceph_inode(inode)->i_vino.ino;
 439 }
 440 static inline u64 ceph_snap(struct inode *inode)
 441 {
 442         return ceph_inode(inode)->i_vino.snap;
 443 }
 444
 445 static inline int ceph_ino_compare(struct inode *inode, void *data)
 446 {
 447         struct ceph_vino *pvino = (struct ceph_vino *)data;
 448         struct ceph_inode_info *ci = ceph_inode(inode);
 449         return ci->i_vino.ino == pvino->ino &&
 450                 ci->i_vino.snap == pvino->snap;
 451 }
 452
 453 static inline struct inode *ceph_find_inode(struct super_block *sb,
 454                                             struct ceph_vino vino)
 455 {
 456         ino_t t = ceph_vino_to_ino(vino);
 457         return ilookup5(sb, t, ceph_ino_compare, &vino);
 458 }
 459
 460
 461 /*
 462  * Ceph inode.
 463  */
 464 #define CEPH_I_DIR_ORDERED      (1 << 0)  /* dentries in dir are ordered */
 465 #define CEPH_I_NODELAY          (1 << 1)  /* do not delay cap release */
 466 #define CEPH_I_FLUSH            (1 << 2)  /* do not delay flush of dirty metadata */
 467 #define CEPH_I_NOFLUSH          (1 << 3)  /* do not flush dirty caps */
 468 #define CEPH_I_POOL_PERM        (1 << 4)  /* pool rd/wr bits are valid */
 469 #define CEPH_I_POOL_RD          (1 << 5)  /* can read from pool */
 470 #define CEPH_I_POOL_WR          (1 << 6)  /* can write to pool */
 471
 472
 473 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
 474                                            long long release_count,
 475                                            long long ordered_count)
 476 {
 477         smp_mb__before_atomic();
 478         atomic64_set(&ci->i_complete_seq[0], release_count);
 479         atomic64_set(&ci->i_complete_seq[1], ordered_count);
 480 }
 481
 482 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
 483 {
 484         atomic64_inc(&ci->i_release_count);
 485 }
 486
 487 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
 488 {
 489         atomic64_inc(&ci->i_ordered_count);
 490 }
 491
 492 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
 493 {
 494         return atomic64_read(&ci->i_complete_seq[0]) ==
 495                 atomic64_read(&ci->i_release_count);
 496 }
 497
 498 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
 499 {
 500         return  atomic64_read(&ci->i_complete_seq[0]) ==
 501                 atomic64_read(&ci->i_release_count) &&
 502                 atomic64_read(&ci->i_complete_seq[1]) ==
 503                 atomic64_read(&ci->i_ordered_count);
 504 }
 505
 506 static inline void ceph_dir_clear_complete(struct inode *inode)
 507 {
 508         __ceph_dir_clear_complete(ceph_inode(inode));
 509 }
 510
 511 static inline void ceph_dir_clear_ordered(struct inode *inode)
 512 {
 513         __ceph_dir_clear_ordered(ceph_inode(inode));
 514 }
 515
 516 static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
 517 {
 518         bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
 519         smp_rmb();
 520         return ret;
 521 }
 522
 523 /* find a specific frag @f */
 524 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
 525                                                 u32 f);
 526
 527 /*
 528  * choose fragment for value @v.  copy frag content to pfrag, if leaf
 529  * exists
 530  */
 531 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 532                             struct ceph_inode_frag *pfrag,
 533                             int *found);
 534
 535 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
 536 {
 537         return (struct ceph_dentry_info *)dentry->d_fsdata;
 538 }
 539
 540 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
 541 {
 542         return ((loff_t)frag << 32) | (loff_t)off;
 543 }
 544
 545 /*
 546  * caps helpers
 547  */
 548 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
 549 {
 550         return !RB_EMPTY_ROOT(&ci->i_caps);
 551 }
 552
 553 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
 554 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
 555 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
 556                                     struct ceph_cap *cap);
 557
 558 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
 559 {
 560         int issued;
 561         spin_lock(&ci->i_ceph_lock);
 562         issued = __ceph_caps_issued(ci, NULL);
 563         spin_unlock(&ci->i_ceph_lock);
 564         return issued;
 565 }
 566
 567 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
 568                                         int touch)
 569 {
 570         int r;
 571         spin_lock(&ci->i_ceph_lock);
 572         r = __ceph_caps_issued_mask(ci, mask, touch);
 573         spin_unlock(&ci->i_ceph_lock);
 574         return r;
 575 }
 576
 577 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
 578 {
 579         return ci->i_dirty_caps | ci->i_flushing_caps;
 580 }
 581 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void);
 582 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
 583 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
 584                                   struct ceph_cap_flush **pcf);
 585
 586 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
 587                                       struct ceph_cap *ocap, int mask);
 588 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 589 extern int __ceph_caps_used(struct ceph_inode_info *ci);
 590
 591 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
 592
 593 /*
 594  * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
 595  */
 596 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
 597 {
 598         int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
 599         if (w & CEPH_CAP_FILE_BUFFER)
 600                 w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
 601         return w;
 602 }
 603
 604 /* what the mds thinks we want */
 605 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
 606
 607 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
 608 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
 609 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
 610 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
 611                              struct ceph_cap_reservation *ctx, int need);
 612 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
 613                                struct ceph_cap_reservation *ctx);
 614 extern void ceph_reservation_status(struct ceph_fs_client *client,
 615                                     int *total, int *avail, int *used,
 616                                     int *reserved, int *min);
 617
 618
 619
 620 /*
 621  * we keep buffered readdir results attached to file->private_data
 622  */
 623 #define CEPH_F_SYNC     1
 624 #define CEPH_F_ATEND    2
 625
 626 struct ceph_file_info {
 627         short fmode;     /* initialized on open */
 628         short flags;     /* CEPH_F_* */
 629
 630         /* readdir: position within the dir */
 631         u32 frag;
 632         struct ceph_mds_request *last_readdir;
 633
 634         /* readdir: position within a frag */
 635         unsigned offset;       /* offset of last chunk, adjusted for . and .. */
 636         unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
 637         char *last_name;       /* last entry in previous chunk */
 638         long long dir_release_count;
 639         long long dir_ordered_count;
 640         int readdir_cache_idx;
 641
 642         /* used for -o dirstat read() on directory thing */
 643         char *dir_info;
 644         int dir_info_len;
 645 };
 646
 647 struct ceph_readdir_cache_control {
 648         struct page  *page;
 649         struct dentry **dentries;
 650         int index;
 651 };
 652
 653 /*
 654  * A "snap realm" describes a subset of the file hierarchy sharing
 655  * the same set of snapshots that apply to it.  The realms themselves
 656  * are organized into a hierarchy, such that children inherit (some of)
 657  * the snapshots of their parents.
 658  *
 659  * All inodes within the realm that have capabilities are linked into a
 660  * per-realm list.
 661  */
 662 struct ceph_snap_realm {
 663         u64 ino;
 664         atomic_t nref;
 665         struct rb_node node;
 666
 667         u64 created, seq;
 668         u64 parent_ino;
 669         u64 parent_since;   /* snapid when our current parent became so */
 670
 671         u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
 672         u32 num_prior_parent_snaps;   /*  had prior to parent_since */
 673         u64 *snaps;                   /* snaps specific to this realm */
 674         u32 num_snaps;
 675
 676         struct ceph_snap_realm *parent;
 677         struct list_head children;       /* list of child realms */
 678         struct list_head child_item;
 679
 680         struct list_head empty_item;     /* if i have ref==0 */
 681
 682         struct list_head dirty_item;     /* if realm needs new context */
 683
 684         /* the current set of snaps for this realm */
 685         struct ceph_snap_context *cached_context;
 686
 687         struct list_head inodes_with_caps;
 688         spinlock_t inodes_with_caps_lock;
 689 };
 690
 691 static inline int default_congestion_kb(void)
 692 {
 693         int congestion_kb;
 694
 695         /*
 696          * Copied from NFS
 697          *
 698          * congestion size, scale with available memory.
 699          *
 700          *  64MB:    8192k
 701          * 128MB:   11585k
 702          * 256MB:   16384k
 703          * 512MB:   23170k
 704          *   1GB:   32768k
 705          *   2GB:   46340k
 706          *   4GB:   65536k
 707          *   8GB:   92681k
 708          *  16GB:  131072k
 709          *
 710          * This allows larger machines to have larger/more transfers.
 711          * Limit the default to 256M
 712          */
 713         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 714         if (congestion_kb > 256*1024)
 715                 congestion_kb = 256*1024;
 716
 717         return congestion_kb;
 718 }
 719
 720
 721
 722 /* snap.c */
 723 extern struct ceph_snap_context *ceph_empty_snapc;
 724 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
 725                                                u64 ino);
 726 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
 727                                 struct ceph_snap_realm *realm);
 728 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
 729                                 struct ceph_snap_realm *realm);
 730 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
 731                                   void *p, void *e, bool deletion,
 732                                   struct ceph_snap_realm **realm_ret);
 733 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
 734                              struct ceph_mds_session *session,
 735                              struct ceph_msg *msg);
 736 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
 737 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 738                                   struct ceph_cap_snap *capsnap);
 739 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
 740 extern int ceph_snap_init(void);
 741 extern void ceph_snap_exit(void);
 742
 743 /*
 744  * a cap_snap is "pending" if it is still awaiting an in-progress
 745  * sync write (that may/may not still update size, mtime, etc.).
 746  */
 747 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
 748 {
 749         return !list_empty(&ci->i_cap_snaps) &&
 750                list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
 751                                ci_item)->writing;
 752 }
 753
 754 /* inode.c */
 755 extern const struct inode_operations ceph_file_iops;
 756
 757 extern struct inode *ceph_alloc_inode(struct super_block *sb);
 758 extern void ceph_destroy_inode(struct inode *inode);
 759 extern int ceph_drop_inode(struct inode *inode);
 760
 761 extern struct inode *ceph_get_inode(struct super_block *sb,
 762                                     struct ceph_vino vino);
 763 extern struct inode *ceph_get_snapdir(struct inode *parent);
 764 extern int ceph_fill_file_size(struct inode *inode, int issued,
 765                                u32 truncate_seq, u64 truncate_size, u64 size);
 766 extern void ceph_fill_file_time(struct inode *inode, int issued,
 767                                 u64 time_warp_seq, struct timespec *ctime,
 768                                 struct timespec *mtime, struct timespec *atime);
 769 extern int ceph_fill_trace(struct super_block *sb,
 770                            struct ceph_mds_request *req,
 771                            struct ceph_mds_session *session);
 772 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 773                                     struct ceph_mds_session *session);
 774
 775 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
 776
 777 extern int ceph_inode_set_size(struct inode *inode, loff_t size);
 778 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
 779 extern void ceph_queue_vmtruncate(struct inode *inode);
 780
 781 extern void ceph_queue_invalidate(struct inode *inode);
 782 extern void ceph_queue_writeback(struct inode *inode);
 783
 784 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
 785                              int mask, bool force);
 786 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
 787 {
 788         return __ceph_do_getattr(inode, NULL, mask, force);
 789 }
 790 extern int ceph_permission(struct inode *inode, int mask);
 791 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 792 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
 793                         struct kstat *stat);
 794
 795 /* xattr.c */
 796 extern int ceph_setxattr(struct dentry *, const char *, const void *,
 797                          size_t, int);
 798 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
 799 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
 800 int __ceph_removexattr(struct dentry *, const char *);
 801 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
 802 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 803 extern int ceph_removexattr(struct dentry *, const char *);
 804 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 805 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 806 extern void __init ceph_xattr_init(void);
 807 extern void ceph_xattr_exit(void);
 808 extern const struct xattr_handler *ceph_xattr_handlers[];
 809
 810 /* acl.c */
 811 struct ceph_acls_info {
 812         void *default_acl;
 813         void *acl;
 814         struct ceph_pagelist *pagelist;
 815 };
 816
 817 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 818
 819 struct posix_acl *ceph_get_acl(struct inode *, int);
 820 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 821 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 822                        struct ceph_acls_info *info);
 823 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
 824 void ceph_release_acls_info(struct ceph_acls_info *info);
 825
 826 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 827 {
 828        forget_all_cached_acls(inode);
 829 }
 830
 831 #else
 832
 833 #define ceph_get_acl NULL
 834 #define ceph_set_acl NULL
 835
 836 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 837                                      struct ceph_acls_info *info)
 838 {
 839         return 0;
 840 }
 841 static inline void ceph_init_inode_acls(struct inode *inode,
 842                                         struct ceph_acls_info *info)
 843 {
 844 }
 845 static inline void ceph_release_acls_info(struct ceph_acls_info *info)
 846 {
 847 }
 848 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
 849 {
 850         return 0;
 851 }
 852
 853 static inline void ceph_forget_all_cached_acls(struct inode *inode)
 854 {
 855 }
 856
 857 #endif
 858
 859 /* caps.c */
 860 extern const char *ceph_cap_string(int c);
 861 extern void ceph_handle_caps(struct ceph_mds_session *session,
 862                              struct ceph_msg *msg);
 863 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
 864                                      struct ceph_cap_reservation *ctx);
 865 extern void ceph_add_cap(struct inode *inode,
 866                          struct ceph_mds_session *session, u64 cap_id,
 867                          int fmode, unsigned issued, unsigned wanted,
 868                          unsigned cap, unsigned seq, u64 realmino, int flags,
 869                          struct ceph_cap **new_cap);
 870 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 871 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
 872                          struct ceph_cap *cap);
 873 extern int ceph_is_any_caps(struct inode *inode);
 874
 875 extern void ceph_queue_caps_release(struct inode *inode);
 876 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
 877 extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
 878                       int datasync);
 879 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
 880                                           struct ceph_mds_session *session);
 881 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
 882                                     struct ceph_mds_session *session);
 883 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
 884                                              int mds);
 885 extern int ceph_get_cap_mds(struct inode *inode);
 886 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
 887 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 888 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 889                                        struct ceph_snap_context *snapc);
 890 extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
 891                                struct ceph_mds_session **psession,
 892                                int again);
 893 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 894                             struct ceph_mds_session *session);
 895 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 896 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
 897
 898 extern int ceph_encode_inode_release(void **p, struct inode *inode,
 899                                      int mds, int drop, int unless, int force);
 900 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 901                                       int mds, int drop, int unless);
 902
 903 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 904                          loff_t endoff, int *got, struct page **pinned_page);
 905
 906 /* for counting open files by mode */
 907 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
 908 {
 909         ci->i_nr_by_mode[mode]++;
 910 }
 911 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
 912
 913 /* addr.c */
 914 extern const struct address_space_operations ceph_aops;
 915 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 916 extern int ceph_uninline_data(struct file *filp, struct page *locked_page);
 917 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need);
 918 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
 919
 920 /* file.c */
 921 extern const struct file_operations ceph_file_fops;
 922
 923 extern int ceph_open(struct inode *inode, struct file *file);
 924 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 925                             struct file *file, unsigned flags, umode_t mode,
 926                             int *opened);
 927 extern int ceph_release(struct inode *inode, struct file *filp);
 928 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
 929                                   char *data, size_t len);
 930 /* dir.c */
 931 extern const struct file_operations ceph_dir_fops;
 932 extern const struct file_operations ceph_snapdir_fops;
 933 extern const struct inode_operations ceph_dir_iops;
 934 extern const struct inode_operations ceph_snapdir_iops;
 935 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
 936         ceph_snapdir_dentry_ops;
 937
 938 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
 939 extern int ceph_handle_snapdir(struct ceph_mds_request *req,
 940                                struct dentry *dentry, int err);
 941 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 942                                          struct dentry *dentry, int err);
 943
 944 extern void ceph_dentry_lru_add(struct dentry *dn);
 945 extern void ceph_dentry_lru_touch(struct dentry *dn);
 946 extern void ceph_dentry_lru_del(struct dentry *dn);
 947 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 948 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
 949 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
 950 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
 951
 952 /*
 953  * our d_ops vary depending on whether the inode is live,
 954  * snapshotted (read-only), or a virtual ".snap" directory.
 955  */
 956 int ceph_init_dentry(struct dentry *dentry);
 957
 958
 959 /* ioctl.c */
 960 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 961
 962 /* export.c */
 963 extern const struct export_operations ceph_export_ops;
 964
 965 /* locks.c */
 966 extern __init void ceph_flock_init(void);
 967 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
 968 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
 969 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
 970 extern int ceph_encode_locks_to_buffer(struct inode *inode,
 971                                        struct ceph_filelock *flocks,
 972                                        int num_fcntl_locks,
 973                                        int num_flock_locks);
 974 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
 975                                   struct ceph_pagelist *pagelist,
 976                                   int num_fcntl_locks, int num_flock_locks);
 977 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
 978
 979 /* debugfs.c */
 980 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
 981 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 982
 983 #endif /* _FS_CEPH_SUPER_H */