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