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   20  /* 1 MB */
  25#define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
  26
  27#define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
  28#define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
  29#define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
  30#define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
  31#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        uid_t uid;
 142        gid_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        unsigned long flags;
 208        struct ceph_mds_session *lease_session;
 209        u32 lease_gen, lease_shared_gen;
 210        u32 lease_seq;
 211        unsigned long lease_renew_after, lease_renew_from;
 212        struct list_head lru;
 213        struct dentry *dentry;
 214        u64 time;
 215        u64 offset;
 216};
 217
 218/*
 219 * dentry flags
 220 *
 221 * The locking for D_COMPLETE is a bit odd:
 222 *  - we can clear it at almost any time (see ceph_d_prune)
 223 *  - it is only meaningful if:
 224 *    - we hold dir inode i_ceph_lock
 225 *    - we hold dir FILE_SHARED caps
 226 *    - the dentry D_COMPLETE is set
 227 */
 228#define CEPH_D_COMPLETE 1  /* if set, d_u.d_subdirs is complete directory */
 229
 230struct ceph_inode_xattrs_info {
 231        /*
 232         * (still encoded) xattr blob. we avoid the overhead of parsing
 233         * this until someone actually calls getxattr, etc.
 234         *
 235         * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
 236         * NULL means we don't know.
 237        */
 238        struct ceph_buffer *blob, *prealloc_blob;
 239
 240        struct rb_root index;
 241        bool dirty;
 242        int count;
 243        int names_size;
 244        int vals_size;
 245        u64 version, index_version;
 246};
 247
 248/*
 249 * Ceph inode.
 250 */
 251struct ceph_inode_info {
 252        struct ceph_vino i_vino;   /* ceph ino + snap */
 253
 254        spinlock_t i_ceph_lock;
 255
 256        u64 i_version;
 257        u32 i_time_warp_seq;
 258
 259        unsigned i_ceph_flags;
 260        unsigned long i_release_count;
 261
 262        struct ceph_dir_layout i_dir_layout;
 263        struct ceph_file_layout i_layout;
 264        char *i_symlink;
 265
 266        /* for dirs */
 267        struct timespec i_rctime;
 268        u64 i_rbytes, i_rfiles, i_rsubdirs;
 269        u64 i_files, i_subdirs;
 270        u64 i_max_offset;  /* largest readdir offset, set with D_COMPLETE */
 271
 272        struct rb_root i_fragtree;
 273        struct mutex i_fragtree_mutex;
 274
 275        struct ceph_inode_xattrs_info i_xattrs;
 276
 277        /* capabilities.  protected _both_ by i_ceph_lock and cap->session's
 278         * s_mutex. */
 279        struct rb_root i_caps;           /* cap list */
 280        struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
 281        unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
 282        struct list_head i_dirty_item, i_flushing_item;
 283        u64 i_cap_flush_seq;
 284        /* we need to track cap writeback on a per-cap-bit basis, to allow
 285         * overlapping, pipelined cap flushes to the mds.  we can probably
 286         * reduce the tid to 8 bits if we're concerned about inode size. */
 287        u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
 288        wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
 289        unsigned long i_hold_caps_min; /* jiffies */
 290        unsigned long i_hold_caps_max; /* jiffies */
 291        struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
 292        int i_cap_exporting_mds;         /* to handle cap migration between */
 293        unsigned i_cap_exporting_mseq;   /*  mds's. */
 294        unsigned i_cap_exporting_issued;
 295        struct ceph_cap_reservation i_cap_migration_resv;
 296        struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
 297        struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
 298                                                    dirty|flushing caps */
 299        unsigned i_snap_caps;           /* cap bits for snapped files */
 300
 301        int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
 302
 303        u32 i_truncate_seq;        /* last truncate to smaller size */
 304        u64 i_truncate_size;       /*  and the size we last truncated down to */
 305        int i_truncate_pending;    /*  still need to call vmtruncate */
 306
 307        u64 i_max_size;            /* max file size authorized by mds */
 308        u64 i_reported_size; /* (max_)size reported to or requested of mds */
 309        u64 i_wanted_max_size;     /* offset we'd like to write too */
 310        u64 i_requested_max_size;  /* max_size we've requested */
 311
 312        /* held references to caps */
 313        int i_pin_ref;
 314        int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
 315        int i_wrbuffer_ref, i_wrbuffer_ref_head;
 316        u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 317        u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
 318        u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
 319
 320        struct list_head i_unsafe_writes; /* uncommitted sync writes */
 321        struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 322        spinlock_t i_unsafe_lock;
 323
 324        struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
 325        int i_snap_realm_counter; /* snap realm (if caps) */
 326        struct list_head i_snap_realm_item;
 327        struct list_head i_snap_flush_item;
 328
 329        struct work_struct i_wb_work;  /* writeback work */
 330        struct work_struct i_pg_inv_work;  /* page invalidation work */
 331
 332        struct work_struct i_vmtruncate_work;
 333
 334        struct inode vfs_inode; /* at end */
 335};
 336
 337static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
 338{
 339        return container_of(inode, struct ceph_inode_info, vfs_inode);
 340}
 341
 342static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
 343{
 344        return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
 345}
 346
 347static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
 348{
 349        return (struct ceph_fs_client *)sb->s_fs_info;
 350}
 351
 352static inline struct ceph_vino ceph_vino(struct inode *inode)
 353{
 354        return ceph_inode(inode)->i_vino;
 355}
 356
 357/*
 358 * ino_t is <64 bits on many architectures, blech.
 359 *
 360 *               i_ino (kernel inode)   st_ino (userspace)
 361 * i386          32                     32
 362 * x86_64+ino32  64                     32
 363 * x86_64        64                     64
 364 */
 365static inline u32 ceph_ino_to_ino32(__u64 vino)
 366{
 367        u32 ino = vino & 0xffffffff;
 368        ino ^= vino >> 32;
 369        if (!ino)
 370                ino = 2;
 371        return ino;
 372}
 373
 374/*
 375 * kernel i_ino value
 376 */
 377static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
 378{
 379#if BITS_PER_LONG == 32
 380        return ceph_ino_to_ino32(vino.ino);
 381#else
 382        return (ino_t)vino.ino;
 383#endif
 384}
 385
 386/*
 387 * user-visible ino (stat, filldir)
 388 */
 389#if BITS_PER_LONG == 32
 390static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 391{
 392        return ino;
 393}
 394#else
 395static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 396{
 397        if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
 398                ino = ceph_ino_to_ino32(ino);
 399        return ino;
 400}
 401#endif
 402
 403
 404/* for printf-style formatting */
 405#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
 406
 407static inline u64 ceph_ino(struct inode *inode)
 408{
 409        return ceph_inode(inode)->i_vino.ino;
 410}
 411static inline u64 ceph_snap(struct inode *inode)
 412{
 413        return ceph_inode(inode)->i_vino.snap;
 414}
 415
 416static inline int ceph_ino_compare(struct inode *inode, void *data)
 417{
 418        struct ceph_vino *pvino = (struct ceph_vino *)data;
 419        struct ceph_inode_info *ci = ceph_inode(inode);
 420        return ci->i_vino.ino == pvino->ino &&
 421                ci->i_vino.snap == pvino->snap;
 422}
 423
 424static inline struct inode *ceph_find_inode(struct super_block *sb,
 425                                            struct ceph_vino vino)
 426{
 427        ino_t t = ceph_vino_to_ino(vino);
 428        return ilookup5(sb, t, ceph_ino_compare, &vino);
 429}
 430
 431
 432/*
 433 * Ceph inode.
 434 */
 435#define CEPH_I_NODELAY   4  /* do not delay cap release */
 436#define CEPH_I_FLUSH     8  /* do not delay flush of dirty metadata */
 437#define CEPH_I_NOFLUSH  16  /* do not flush dirty caps */
 438
 439static inline void ceph_i_clear(struct inode *inode, unsigned mask)
 440{
 441        struct ceph_inode_info *ci = ceph_inode(inode);
 442
 443        spin_lock(&ci->i_ceph_lock);
 444        ci->i_ceph_flags &= ~mask;
 445        spin_unlock(&ci->i_ceph_lock);
 446}
 447
 448static inline void ceph_i_set(struct inode *inode, unsigned mask)
 449{
 450        struct ceph_inode_info *ci = ceph_inode(inode);
 451
 452        spin_lock(&ci->i_ceph_lock);
 453        ci->i_ceph_flags |= mask;
 454        spin_unlock(&ci->i_ceph_lock);
 455}
 456
 457static inline bool ceph_i_test(struct inode *inode, unsigned mask)
 458{
 459        struct ceph_inode_info *ci = ceph_inode(inode);
 460        bool r;
 461
 462        spin_lock(&ci->i_ceph_lock);
 463        r = (ci->i_ceph_flags & mask) == mask;
 464        spin_unlock(&ci->i_ceph_lock);
 465        return r;
 466}
 467
 468
 469/* find a specific frag @f */
 470extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
 471                                                u32 f);
 472
 473/*
 474 * choose fragment for value @v.  copy frag content to pfrag, if leaf
 475 * exists
 476 */
 477extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 478                            struct ceph_inode_frag *pfrag,
 479                            int *found);
 480
 481static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
 482{
 483        return (struct ceph_dentry_info *)dentry->d_fsdata;
 484}
 485
 486static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
 487{
 488        return ((loff_t)frag << 32) | (loff_t)off;
 489}
 490
 491/*
 492 * set/clear directory D_COMPLETE flag
 493 */
 494void ceph_dir_set_complete(struct inode *inode);
 495void ceph_dir_clear_complete(struct inode *inode);
 496bool ceph_dir_test_complete(struct inode *inode);
 497
 498/*
 499 * caps helpers
 500 */
 501static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
 502{
 503        return !RB_EMPTY_ROOT(&ci->i_caps);
 504}
 505
 506extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
 507extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
 508extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
 509                                    struct ceph_cap *cap);
 510
 511static inline int ceph_caps_issued(struct ceph_inode_info *ci)
 512{
 513        int issued;
 514        spin_lock(&ci->i_ceph_lock);
 515        issued = __ceph_caps_issued(ci, NULL);
 516        spin_unlock(&ci->i_ceph_lock);
 517        return issued;
 518}
 519
 520static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
 521                                        int touch)
 522{
 523        int r;
 524        spin_lock(&ci->i_ceph_lock);
 525        r = __ceph_caps_issued_mask(ci, mask, touch);
 526        spin_unlock(&ci->i_ceph_lock);
 527        return r;
 528}
 529
 530static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
 531{
 532        return ci->i_dirty_caps | ci->i_flushing_caps;
 533}
 534extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
 535
 536extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 537extern int __ceph_caps_used(struct ceph_inode_info *ci);
 538
 539extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
 540
 541/*
 542 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
 543 */
 544static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
 545{
 546        int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
 547        if (w & CEPH_CAP_FILE_BUFFER)
 548                w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
 549        return w;
 550}
 551
 552/* what the mds thinks we want */
 553extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
 554
 555extern void ceph_caps_init(struct ceph_mds_client *mdsc);
 556extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
 557extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
 558extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
 559                             struct ceph_cap_reservation *ctx, int need);
 560extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
 561                               struct ceph_cap_reservation *ctx);
 562extern void ceph_reservation_status(struct ceph_fs_client *client,
 563                                    int *total, int *avail, int *used,
 564                                    int *reserved, int *min);
 565
 566
 567
 568/*
 569 * we keep buffered readdir results attached to file->private_data
 570 */
 571#define CEPH_F_SYNC     1
 572#define CEPH_F_ATEND    2
 573
 574struct ceph_file_info {
 575        short fmode;     /* initialized on open */
 576        short flags;     /* CEPH_F_* */
 577
 578        /* readdir: position within the dir */
 579        u32 frag;
 580        struct ceph_mds_request *last_readdir;
 581
 582        /* readdir: position within a frag */
 583        unsigned offset;       /* offset of last chunk, adjusted for . and .. */
 584        u64 next_offset;       /* offset of next chunk (last_name's + 1) */
 585        char *last_name;       /* last entry in previous chunk */
 586        struct dentry *dentry; /* next dentry (for dcache readdir) */
 587        unsigned long dir_release_count;
 588
 589        /* used for -o dirstat read() on directory thing */
 590        char *dir_info;
 591        int dir_info_len;
 592};
 593
 594
 595
 596/*
 597 * A "snap realm" describes a subset of the file hierarchy sharing
 598 * the same set of snapshots that apply to it.  The realms themselves
 599 * are organized into a hierarchy, such that children inherit (some of)
 600 * the snapshots of their parents.
 601 *
 602 * All inodes within the realm that have capabilities are linked into a
 603 * per-realm list.
 604 */
 605struct ceph_snap_realm {
 606        u64 ino;
 607        atomic_t nref;
 608        struct rb_node node;
 609
 610        u64 created, seq;
 611        u64 parent_ino;
 612        u64 parent_since;   /* snapid when our current parent became so */
 613
 614        u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
 615        u32 num_prior_parent_snaps;   /*  had prior to parent_since */
 616        u64 *snaps;                   /* snaps specific to this realm */
 617        u32 num_snaps;
 618
 619        struct ceph_snap_realm *parent;
 620        struct list_head children;       /* list of child realms */
 621        struct list_head child_item;
 622
 623        struct list_head empty_item;     /* if i have ref==0 */
 624
 625        struct list_head dirty_item;     /* if realm needs new context */
 626
 627        /* the current set of snaps for this realm */
 628        struct ceph_snap_context *cached_context;
 629
 630        struct list_head inodes_with_caps;
 631        spinlock_t inodes_with_caps_lock;
 632};
 633
 634static inline int default_congestion_kb(void)
 635{
 636        int congestion_kb;
 637
 638        /*
 639         * Copied from NFS
 640         *
 641         * congestion size, scale with available memory.
 642         *
 643         *  64MB:    8192k
 644         * 128MB:   11585k
 645         * 256MB:   16384k
 646         * 512MB:   23170k
 647         *   1GB:   32768k
 648         *   2GB:   46340k
 649         *   4GB:   65536k
 650         *   8GB:   92681k
 651         *  16GB:  131072k
 652         *
 653         * This allows larger machines to have larger/more transfers.
 654         * Limit the default to 256M
 655         */
 656        congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 657        if (congestion_kb > 256*1024)
 658                congestion_kb = 256*1024;
 659
 660        return congestion_kb;
 661}
 662
 663
 664
 665/* snap.c */
 666struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
 667                                               u64 ino);
 668extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
 669                                struct ceph_snap_realm *realm);
 670extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
 671                                struct ceph_snap_realm *realm);
 672extern int ceph_update_snap_trace(struct ceph_mds_client *m,
 673                                  void *p, void *e, bool deletion);
 674extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
 675                             struct ceph_mds_session *session,
 676                             struct ceph_msg *msg);
 677extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
 678extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 679                                  struct ceph_cap_snap *capsnap);
 680extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
 681
 682/*
 683 * a cap_snap is "pending" if it is still awaiting an in-progress
 684 * sync write (that may/may not still update size, mtime, etc.).
 685 */
 686static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
 687{
 688        return !list_empty(&ci->i_cap_snaps) &&
 689                list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
 690                           ci_item)->writing;
 691}
 692
 693/* inode.c */
 694extern const struct inode_operations ceph_file_iops;
 695
 696extern struct inode *ceph_alloc_inode(struct super_block *sb);
 697extern void ceph_destroy_inode(struct inode *inode);
 698
 699extern struct inode *ceph_get_inode(struct super_block *sb,
 700                                    struct ceph_vino vino);
 701extern struct inode *ceph_get_snapdir(struct inode *parent);
 702extern int ceph_fill_file_size(struct inode *inode, int issued,
 703                               u32 truncate_seq, u64 truncate_size, u64 size);
 704extern void ceph_fill_file_time(struct inode *inode, int issued,
 705                                u64 time_warp_seq, struct timespec *ctime,
 706                                struct timespec *mtime, struct timespec *atime);
 707extern int ceph_fill_trace(struct super_block *sb,
 708                           struct ceph_mds_request *req,
 709                           struct ceph_mds_session *session);
 710extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 711                                    struct ceph_mds_session *session);
 712
 713extern int ceph_inode_holds_cap(struct inode *inode, int mask);
 714
 715extern int ceph_inode_set_size(struct inode *inode, loff_t size);
 716extern void __ceph_do_pending_vmtruncate(struct inode *inode);
 717extern void ceph_queue_vmtruncate(struct inode *inode);
 718
 719extern void ceph_queue_invalidate(struct inode *inode);
 720extern void ceph_queue_writeback(struct inode *inode);
 721
 722extern int ceph_do_getattr(struct inode *inode, int mask);
 723extern int ceph_permission(struct inode *inode, int mask);
 724extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
 725extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
 726                        struct kstat *stat);
 727
 728/* xattr.c */
 729extern int ceph_setxattr(struct dentry *, const char *, const void *,
 730                         size_t, int);
 731extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
 732extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 733extern int ceph_removexattr(struct dentry *, const char *);
 734extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 735extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 736extern void __init ceph_xattr_init(void);
 737extern void ceph_xattr_exit(void);
 738
 739/* caps.c */
 740extern const char *ceph_cap_string(int c);
 741extern void ceph_handle_caps(struct ceph_mds_session *session,
 742                             struct ceph_msg *msg);
 743extern int ceph_add_cap(struct inode *inode,
 744                        struct ceph_mds_session *session, u64 cap_id,
 745                        int fmode, unsigned issued, unsigned wanted,
 746                        unsigned cap, unsigned seq, u64 realmino, int flags,
 747                        struct ceph_cap_reservation *caps_reservation);
 748extern void __ceph_remove_cap(struct ceph_cap *cap);
 749static inline void ceph_remove_cap(struct ceph_cap *cap)
 750{
 751        spin_lock(&cap->ci->i_ceph_lock);
 752        __ceph_remove_cap(cap);
 753        spin_unlock(&cap->ci->i_ceph_lock);
 754}
 755extern void ceph_put_cap(struct ceph_mds_client *mdsc,
 756                         struct ceph_cap *cap);
 757
 758extern void ceph_queue_caps_release(struct inode *inode);
 759extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
 760extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
 761                      int datasync);
 762extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
 763                                    struct ceph_mds_session *session);
 764extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
 765                                             int mds);
 766extern int ceph_get_cap_mds(struct inode *inode);
 767extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
 768extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 769extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 770                                       struct ceph_snap_context *snapc);
 771extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
 772                               struct ceph_mds_session **psession,
 773                               int again);
 774extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 775                            struct ceph_mds_session *session);
 776extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 777extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
 778
 779extern int ceph_encode_inode_release(void **p, struct inode *inode,
 780                                     int mds, int drop, int unless, int force);
 781extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 782                                      int mds, int drop, int unless);
 783
 784extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
 785                         int *got, loff_t endoff);
 786
 787/* for counting open files by mode */
 788static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
 789{
 790        ci->i_nr_by_mode[mode]++;
 791}
 792extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
 793
 794/* addr.c */
 795extern const struct address_space_operations ceph_aops;
 796extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 797
 798/* file.c */
 799extern const struct file_operations ceph_file_fops;
 800extern const struct address_space_operations ceph_aops;
 801extern int ceph_copy_to_page_vector(struct page **pages,
 802                                    const char *data,
 803                                    loff_t off, size_t len);
 804extern int ceph_copy_from_page_vector(struct page **pages,
 805                                    char *data,
 806                                    loff_t off, size_t len);
 807extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
 808extern int ceph_open(struct inode *inode, struct file *file);
 809extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 810                            struct file *file, unsigned flags, umode_t mode,
 811                            int *opened);
 812extern int ceph_release(struct inode *inode, struct file *filp);
 813
 814/* dir.c */
 815extern const struct file_operations ceph_dir_fops;
 816extern const struct inode_operations ceph_dir_iops;
 817extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
 818        ceph_snapdir_dentry_ops;
 819
 820extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
 821extern int ceph_handle_snapdir(struct ceph_mds_request *req,
 822                               struct dentry *dentry, int err);
 823extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 824                                         struct dentry *dentry, int err);
 825
 826extern void ceph_dentry_lru_add(struct dentry *dn);
 827extern void ceph_dentry_lru_touch(struct dentry *dn);
 828extern void ceph_dentry_lru_del(struct dentry *dn);
 829extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 830extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
 831extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
 832
 833/*
 834 * our d_ops vary depending on whether the inode is live,
 835 * snapshotted (read-only), or a virtual ".snap" directory.
 836 */
 837int ceph_init_dentry(struct dentry *dentry);
 838
 839
 840/* ioctl.c */
 841extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 842
 843/* export.c */
 844extern const struct export_operations ceph_export_ops;
 845
 846/* locks.c */
 847extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
 848extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
 849extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
 850extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p,
 851                             int p_locks, int f_locks);
 852extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
 853
 854/* debugfs.c */
 855extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
 856extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 857
 858#endif /* _FS_CEPH_SUPER_H */
 859
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