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