linux/fs/ceph/dir.c
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   1#include <linux/ceph/ceph_debug.h>
   2
   3#include <linux/spinlock.h>
   4#include <linux/fs_struct.h>
   5#include <linux/namei.h>
   6#include <linux/slab.h>
   7#include <linux/sched.h>
   8
   9#include "super.h"
  10#include "mds_client.h"
  11
  12/*
  13 * Directory operations: readdir, lookup, create, link, unlink,
  14 * rename, etc.
  15 */
  16
  17/*
  18 * Ceph MDS operations are specified in terms of a base ino and
  19 * relative path.  Thus, the client can specify an operation on a
  20 * specific inode (e.g., a getattr due to fstat(2)), or as a path
  21 * relative to, say, the root directory.
  22 *
  23 * Normally, we limit ourselves to strict inode ops (no path component)
  24 * or dentry operations (a single path component relative to an ino).  The
  25 * exception to this is open_root_dentry(), which will open the mount
  26 * point by name.
  27 */
  28
  29const struct inode_operations ceph_dir_iops;
  30const struct file_operations ceph_dir_fops;
  31const struct dentry_operations ceph_dentry_ops;
  32
  33/*
  34 * Initialize ceph dentry state.
  35 */
  36int ceph_init_dentry(struct dentry *dentry)
  37{
  38        struct ceph_dentry_info *di;
  39
  40        if (dentry->d_fsdata)
  41                return 0;
  42
  43        di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
  44        if (!di)
  45                return -ENOMEM;          /* oh well */
  46
  47        spin_lock(&dentry->d_lock);
  48        if (dentry->d_fsdata) {
  49                /* lost a race */
  50                kmem_cache_free(ceph_dentry_cachep, di);
  51                goto out_unlock;
  52        }
  53
  54        if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
  55                d_set_d_op(dentry, &ceph_dentry_ops);
  56        else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
  57                d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
  58        else
  59                d_set_d_op(dentry, &ceph_snap_dentry_ops);
  60
  61        di->dentry = dentry;
  62        di->lease_session = NULL;
  63        dentry->d_time = jiffies;
  64        /* avoid reordering d_fsdata setup so that the check above is safe */
  65        smp_mb();
  66        dentry->d_fsdata = di;
  67        ceph_dentry_lru_add(dentry);
  68out_unlock:
  69        spin_unlock(&dentry->d_lock);
  70        return 0;
  71}
  72
  73struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
  74{
  75        struct inode *inode = NULL;
  76
  77        if (!dentry)
  78                return NULL;
  79
  80        spin_lock(&dentry->d_lock);
  81        if (!IS_ROOT(dentry)) {
  82                inode = dentry->d_parent->d_inode;
  83                ihold(inode);
  84        }
  85        spin_unlock(&dentry->d_lock);
  86        return inode;
  87}
  88
  89
  90/*
  91 * for readdir, we encode the directory frag and offset within that
  92 * frag into f_pos.
  93 */
  94static unsigned fpos_frag(loff_t p)
  95{
  96        return p >> 32;
  97}
  98static unsigned fpos_off(loff_t p)
  99{
 100        return p & 0xffffffff;
 101}
 102
 103/*
 104 * When possible, we try to satisfy a readdir by peeking at the
 105 * dcache.  We make this work by carefully ordering dentries on
 106 * d_u.d_child when we initially get results back from the MDS, and
 107 * falling back to a "normal" sync readdir if any dentries in the dir
 108 * are dropped.
 109 *
 110 * D_COMPLETE tells indicates we have all dentries in the dir.  It is
 111 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
 112 * the MDS if/when the directory is modified).
 113 */
 114static int __dcache_readdir(struct file *filp,
 115                            void *dirent, filldir_t filldir)
 116{
 117        struct ceph_file_info *fi = filp->private_data;
 118        struct dentry *parent = filp->f_dentry;
 119        struct inode *dir = parent->d_inode;
 120        struct list_head *p;
 121        struct dentry *dentry, *last;
 122        struct ceph_dentry_info *di;
 123        int err = 0;
 124
 125        /* claim ref on last dentry we returned */
 126        last = fi->dentry;
 127        fi->dentry = NULL;
 128
 129        dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
 130             last);
 131
 132        spin_lock(&parent->d_lock);
 133
 134        /* start at beginning? */
 135        if (filp->f_pos == 2 || last == NULL ||
 136            filp->f_pos < ceph_dentry(last)->offset) {
 137                if (list_empty(&parent->d_subdirs))
 138                        goto out_unlock;
 139                p = parent->d_subdirs.prev;
 140                dout(" initial p %p/%p\n", p->prev, p->next);
 141        } else {
 142                p = last->d_u.d_child.prev;
 143        }
 144
 145more:
 146        dentry = list_entry(p, struct dentry, d_u.d_child);
 147        di = ceph_dentry(dentry);
 148        while (1) {
 149                dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
 150                     d_unhashed(dentry) ? "!hashed" : "hashed",
 151                     parent->d_subdirs.prev, parent->d_subdirs.next);
 152                if (p == &parent->d_subdirs) {
 153                        fi->flags |= CEPH_F_ATEND;
 154                        goto out_unlock;
 155                }
 156                spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
 157                if (!d_unhashed(dentry) && dentry->d_inode &&
 158                    ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
 159                    ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
 160                    filp->f_pos <= di->offset)
 161                        break;
 162                dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
 163                     dentry->d_name.len, dentry->d_name.name, di->offset,
 164                     filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
 165                     !dentry->d_inode ? " null" : "");
 166                spin_unlock(&dentry->d_lock);
 167                p = p->prev;
 168                dentry = list_entry(p, struct dentry, d_u.d_child);
 169                di = ceph_dentry(dentry);
 170        }
 171
 172        dget_dlock(dentry);
 173        spin_unlock(&dentry->d_lock);
 174        spin_unlock(&parent->d_lock);
 175
 176        dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
 177             dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
 178        filp->f_pos = di->offset;
 179        err = filldir(dirent, dentry->d_name.name,
 180                      dentry->d_name.len, di->offset,
 181                      ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
 182                      dentry->d_inode->i_mode >> 12);
 183
 184        if (last) {
 185                if (err < 0) {
 186                        /* remember our position */
 187                        fi->dentry = last;
 188                        fi->next_offset = di->offset;
 189                } else {
 190                        dput(last);
 191                }
 192        }
 193        last = dentry;
 194
 195        if (err < 0)
 196                goto out;
 197
 198        filp->f_pos++;
 199
 200        /* make sure a dentry wasn't dropped while we didn't have parent lock */
 201        if (!ceph_dir_test_complete(dir)) {
 202                dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
 203                err = -EAGAIN;
 204                goto out;
 205        }
 206
 207        spin_lock(&parent->d_lock);
 208        p = p->prev;    /* advance to next dentry */
 209        goto more;
 210
 211out_unlock:
 212        spin_unlock(&parent->d_lock);
 213out:
 214        if (last)
 215                dput(last);
 216        return err;
 217}
 218
 219/*
 220 * make note of the last dentry we read, so we can
 221 * continue at the same lexicographical point,
 222 * regardless of what dir changes take place on the
 223 * server.
 224 */
 225static int note_last_dentry(struct ceph_file_info *fi, const char *name,
 226                            int len)
 227{
 228        kfree(fi->last_name);
 229        fi->last_name = kmalloc(len+1, GFP_NOFS);
 230        if (!fi->last_name)
 231                return -ENOMEM;
 232        memcpy(fi->last_name, name, len);
 233        fi->last_name[len] = 0;
 234        dout("note_last_dentry '%s'\n", fi->last_name);
 235        return 0;
 236}
 237
 238static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
 239{
 240        struct ceph_file_info *fi = filp->private_data;
 241        struct inode *inode = filp->f_dentry->d_inode;
 242        struct ceph_inode_info *ci = ceph_inode(inode);
 243        struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
 244        struct ceph_mds_client *mdsc = fsc->mdsc;
 245        unsigned frag = fpos_frag(filp->f_pos);
 246        int off = fpos_off(filp->f_pos);
 247        int err;
 248        u32 ftype;
 249        struct ceph_mds_reply_info_parsed *rinfo;
 250        const int max_entries = fsc->mount_options->max_readdir;
 251        const int max_bytes = fsc->mount_options->max_readdir_bytes;
 252
 253        dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
 254        if (fi->flags & CEPH_F_ATEND)
 255                return 0;
 256
 257        /* always start with . and .. */
 258        if (filp->f_pos == 0) {
 259                /* note dir version at start of readdir so we can tell
 260                 * if any dentries get dropped */
 261                fi->dir_release_count = ci->i_release_count;
 262
 263                dout("readdir off 0 -> '.'\n");
 264                if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
 265                            ceph_translate_ino(inode->i_sb, inode->i_ino),
 266                            inode->i_mode >> 12) < 0)
 267                        return 0;
 268                filp->f_pos = 1;
 269                off = 1;
 270        }
 271        if (filp->f_pos == 1) {
 272                ino_t ino = parent_ino(filp->f_dentry);
 273                dout("readdir off 1 -> '..'\n");
 274                if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
 275                            ceph_translate_ino(inode->i_sb, ino),
 276                            inode->i_mode >> 12) < 0)
 277                        return 0;
 278                filp->f_pos = 2;
 279                off = 2;
 280        }
 281
 282        /* can we use the dcache? */
 283        spin_lock(&ci->i_ceph_lock);
 284        if ((filp->f_pos == 2 || fi->dentry) &&
 285            !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
 286            ceph_snap(inode) != CEPH_SNAPDIR &&
 287            ceph_dir_test_complete(inode) &&
 288            __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
 289                spin_unlock(&ci->i_ceph_lock);
 290                err = __dcache_readdir(filp, dirent, filldir);
 291                if (err != -EAGAIN)
 292                        return err;
 293        } else {
 294                spin_unlock(&ci->i_ceph_lock);
 295        }
 296        if (fi->dentry) {
 297                err = note_last_dentry(fi, fi->dentry->d_name.name,
 298                                       fi->dentry->d_name.len);
 299                if (err)
 300                        return err;
 301                dput(fi->dentry);
 302                fi->dentry = NULL;
 303        }
 304
 305        /* proceed with a normal readdir */
 306
 307more:
 308        /* do we have the correct frag content buffered? */
 309        if (fi->frag != frag || fi->last_readdir == NULL) {
 310                struct ceph_mds_request *req;
 311                int op = ceph_snap(inode) == CEPH_SNAPDIR ?
 312                        CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
 313
 314                /* discard old result, if any */
 315                if (fi->last_readdir) {
 316                        ceph_mdsc_put_request(fi->last_readdir);
 317                        fi->last_readdir = NULL;
 318                }
 319
 320                /* requery frag tree, as the frag topology may have changed */
 321                frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
 322
 323                dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
 324                     ceph_vinop(inode), frag, fi->last_name);
 325                req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
 326                if (IS_ERR(req))
 327                        return PTR_ERR(req);
 328                req->r_inode = inode;
 329                ihold(inode);
 330                req->r_dentry = dget(filp->f_dentry);
 331                /* hints to request -> mds selection code */
 332                req->r_direct_mode = USE_AUTH_MDS;
 333                req->r_direct_hash = ceph_frag_value(frag);
 334                req->r_direct_is_hash = true;
 335                req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
 336                req->r_readdir_offset = fi->next_offset;
 337                req->r_args.readdir.frag = cpu_to_le32(frag);
 338                req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
 339                req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
 340                req->r_num_caps = max_entries + 1;
 341                err = ceph_mdsc_do_request(mdsc, NULL, req);
 342                if (err < 0) {
 343                        ceph_mdsc_put_request(req);
 344                        return err;
 345                }
 346                dout("readdir got and parsed readdir result=%d"
 347                     " on frag %x, end=%d, complete=%d\n", err, frag,
 348                     (int)req->r_reply_info.dir_end,
 349                     (int)req->r_reply_info.dir_complete);
 350
 351                if (!req->r_did_prepopulate) {
 352                        dout("readdir !did_prepopulate");
 353                        fi->dir_release_count--;    /* preclude D_COMPLETE */
 354                }
 355
 356                /* note next offset and last dentry name */
 357                fi->offset = fi->next_offset;
 358                fi->last_readdir = req;
 359
 360                if (req->r_reply_info.dir_end) {
 361                        kfree(fi->last_name);
 362                        fi->last_name = NULL;
 363                        if (ceph_frag_is_rightmost(frag))
 364                                fi->next_offset = 2;
 365                        else
 366                                fi->next_offset = 0;
 367                } else {
 368                        rinfo = &req->r_reply_info;
 369                        err = note_last_dentry(fi,
 370                                       rinfo->dir_dname[rinfo->dir_nr-1],
 371                                       rinfo->dir_dname_len[rinfo->dir_nr-1]);
 372                        if (err)
 373                                return err;
 374                        fi->next_offset += rinfo->dir_nr;
 375                }
 376        }
 377
 378        rinfo = &fi->last_readdir->r_reply_info;
 379        dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
 380             rinfo->dir_nr, off, fi->offset);
 381        while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
 382                u64 pos = ceph_make_fpos(frag, off);
 383                struct ceph_mds_reply_inode *in =
 384                        rinfo->dir_in[off - fi->offset].in;
 385                struct ceph_vino vino;
 386                ino_t ino;
 387
 388                dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
 389                     off, off - fi->offset, rinfo->dir_nr, pos,
 390                     rinfo->dir_dname_len[off - fi->offset],
 391                     rinfo->dir_dname[off - fi->offset], in);
 392                BUG_ON(!in);
 393                ftype = le32_to_cpu(in->mode) >> 12;
 394                vino.ino = le64_to_cpu(in->ino);
 395                vino.snap = le64_to_cpu(in->snapid);
 396                ino = ceph_vino_to_ino(vino);
 397                if (filldir(dirent,
 398                            rinfo->dir_dname[off - fi->offset],
 399                            rinfo->dir_dname_len[off - fi->offset],
 400                            pos,
 401                            ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
 402                        dout("filldir stopping us...\n");
 403                        return 0;
 404                }
 405                off++;
 406                filp->f_pos = pos + 1;
 407        }
 408
 409        if (fi->last_name) {
 410                ceph_mdsc_put_request(fi->last_readdir);
 411                fi->last_readdir = NULL;
 412                goto more;
 413        }
 414
 415        /* more frags? */
 416        if (!ceph_frag_is_rightmost(frag)) {
 417                frag = ceph_frag_next(frag);
 418                off = 0;
 419                filp->f_pos = ceph_make_fpos(frag, off);
 420                dout("readdir next frag is %x\n", frag);
 421                goto more;
 422        }
 423        fi->flags |= CEPH_F_ATEND;
 424
 425        /*
 426         * if dir_release_count still matches the dir, no dentries
 427         * were released during the whole readdir, and we should have
 428         * the complete dir contents in our cache.
 429         */
 430        spin_lock(&ci->i_ceph_lock);
 431        if (ci->i_release_count == fi->dir_release_count) {
 432                ceph_dir_set_complete(inode);
 433                ci->i_max_offset = filp->f_pos;
 434        }
 435        spin_unlock(&ci->i_ceph_lock);
 436
 437        dout("readdir %p filp %p done.\n", inode, filp);
 438        return 0;
 439}
 440
 441static void reset_readdir(struct ceph_file_info *fi)
 442{
 443        if (fi->last_readdir) {
 444                ceph_mdsc_put_request(fi->last_readdir);
 445                fi->last_readdir = NULL;
 446        }
 447        kfree(fi->last_name);
 448        fi->last_name = NULL;
 449        fi->next_offset = 2;  /* compensate for . and .. */
 450        if (fi->dentry) {
 451                dput(fi->dentry);
 452                fi->dentry = NULL;
 453        }
 454        fi->flags &= ~CEPH_F_ATEND;
 455}
 456
 457static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
 458{
 459        struct ceph_file_info *fi = file->private_data;
 460        struct inode *inode = file->f_mapping->host;
 461        loff_t old_offset = offset;
 462        loff_t retval;
 463
 464        mutex_lock(&inode->i_mutex);
 465        retval = -EINVAL;
 466        switch (origin) {
 467        case SEEK_END:
 468                offset += inode->i_size + 2;   /* FIXME */
 469                break;
 470        case SEEK_CUR:
 471                offset += file->f_pos;
 472        case SEEK_SET:
 473                break;
 474        default:
 475                goto out;
 476        }
 477
 478        if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
 479                if (offset != file->f_pos) {
 480                        file->f_pos = offset;
 481                        file->f_version = 0;
 482                        fi->flags &= ~CEPH_F_ATEND;
 483                }
 484                retval = offset;
 485
 486                /*
 487                 * discard buffered readdir content on seekdir(0), or
 488                 * seek to new frag, or seek prior to current chunk.
 489                 */
 490                if (offset == 0 ||
 491                    fpos_frag(offset) != fpos_frag(old_offset) ||
 492                    fpos_off(offset) < fi->offset) {
 493                        dout("dir_llseek dropping %p content\n", file);
 494                        reset_readdir(fi);
 495                }
 496
 497                /* bump dir_release_count if we did a forward seek */
 498                if (offset > old_offset)
 499                        fi->dir_release_count--;
 500        }
 501out:
 502        mutex_unlock(&inode->i_mutex);
 503        return retval;
 504}
 505
 506/*
 507 * Handle lookups for the hidden .snap directory.
 508 */
 509int ceph_handle_snapdir(struct ceph_mds_request *req,
 510                        struct dentry *dentry, int err)
 511{
 512        struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
 513        struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
 514
 515        /* .snap dir? */
 516        if (err == -ENOENT &&
 517            ceph_snap(parent) == CEPH_NOSNAP &&
 518            strcmp(dentry->d_name.name,
 519                   fsc->mount_options->snapdir_name) == 0) {
 520                struct inode *inode = ceph_get_snapdir(parent);
 521                dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
 522                     dentry, dentry->d_name.len, dentry->d_name.name, inode);
 523                BUG_ON(!d_unhashed(dentry));
 524                d_add(dentry, inode);
 525                err = 0;
 526        }
 527        return err;
 528}
 529
 530/*
 531 * Figure out final result of a lookup/open request.
 532 *
 533 * Mainly, make sure we return the final req->r_dentry (if it already
 534 * existed) in place of the original VFS-provided dentry when they
 535 * differ.
 536 *
 537 * Gracefully handle the case where the MDS replies with -ENOENT and
 538 * no trace (which it may do, at its discretion, e.g., if it doesn't
 539 * care to issue a lease on the negative dentry).
 540 */
 541struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 542                                  struct dentry *dentry, int err)
 543{
 544        if (err == -ENOENT) {
 545                /* no trace? */
 546                err = 0;
 547                if (!req->r_reply_info.head->is_dentry) {
 548                        dout("ENOENT and no trace, dentry %p inode %p\n",
 549                             dentry, dentry->d_inode);
 550                        if (dentry->d_inode) {
 551                                d_drop(dentry);
 552                                err = -ENOENT;
 553                        } else {
 554                                d_add(dentry, NULL);
 555                        }
 556                }
 557        }
 558        if (err)
 559                dentry = ERR_PTR(err);
 560        else if (dentry != req->r_dentry)
 561                dentry = dget(req->r_dentry);   /* we got spliced */
 562        else
 563                dentry = NULL;
 564        return dentry;
 565}
 566
 567static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
 568{
 569        return ceph_ino(inode) == CEPH_INO_ROOT &&
 570                strncmp(dentry->d_name.name, ".ceph", 5) == 0;
 571}
 572
 573/*
 574 * Look up a single dir entry.  If there is a lookup intent, inform
 575 * the MDS so that it gets our 'caps wanted' value in a single op.
 576 */
 577static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
 578                                  unsigned int flags)
 579{
 580        struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 581        struct ceph_mds_client *mdsc = fsc->mdsc;
 582        struct ceph_mds_request *req;
 583        int op;
 584        int err;
 585
 586        dout("lookup %p dentry %p '%.*s'\n",
 587             dir, dentry, dentry->d_name.len, dentry->d_name.name);
 588
 589        if (dentry->d_name.len > NAME_MAX)
 590                return ERR_PTR(-ENAMETOOLONG);
 591
 592        err = ceph_init_dentry(dentry);
 593        if (err < 0)
 594                return ERR_PTR(err);
 595
 596        /* can we conclude ENOENT locally? */
 597        if (dentry->d_inode == NULL) {
 598                struct ceph_inode_info *ci = ceph_inode(dir);
 599                struct ceph_dentry_info *di = ceph_dentry(dentry);
 600
 601                spin_lock(&ci->i_ceph_lock);
 602                dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
 603                if (strncmp(dentry->d_name.name,
 604                            fsc->mount_options->snapdir_name,
 605                            dentry->d_name.len) &&
 606                    !is_root_ceph_dentry(dir, dentry) &&
 607                    ceph_dir_test_complete(dir) &&
 608                    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
 609                        spin_unlock(&ci->i_ceph_lock);
 610                        dout(" dir %p complete, -ENOENT\n", dir);
 611                        d_add(dentry, NULL);
 612                        di->lease_shared_gen = ci->i_shared_gen;
 613                        return NULL;
 614                }
 615                spin_unlock(&ci->i_ceph_lock);
 616        }
 617
 618        op = ceph_snap(dir) == CEPH_SNAPDIR ?
 619                CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
 620        req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
 621        if (IS_ERR(req))
 622                return ERR_CAST(req);
 623        req->r_dentry = dget(dentry);
 624        req->r_num_caps = 2;
 625        /* we only need inode linkage */
 626        req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 627        req->r_locked_dir = dir;
 628        err = ceph_mdsc_do_request(mdsc, NULL, req);
 629        err = ceph_handle_snapdir(req, dentry, err);
 630        dentry = ceph_finish_lookup(req, dentry, err);
 631        ceph_mdsc_put_request(req);  /* will dput(dentry) */
 632        dout("lookup result=%p\n", dentry);
 633        return dentry;
 634}
 635
 636/*
 637 * If we do a create but get no trace back from the MDS, follow up with
 638 * a lookup (the VFS expects us to link up the provided dentry).
 639 */
 640int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
 641{
 642        struct dentry *result = ceph_lookup(dir, dentry, 0);
 643
 644        if (result && !IS_ERR(result)) {
 645                /*
 646                 * We created the item, then did a lookup, and found
 647                 * it was already linked to another inode we already
 648                 * had in our cache (and thus got spliced).  Link our
 649                 * dentry to that inode, but don't hash it, just in
 650                 * case the VFS wants to dereference it.
 651                 */
 652                BUG_ON(!result->d_inode);
 653                d_instantiate(dentry, result->d_inode);
 654                return 0;
 655        }
 656        return PTR_ERR(result);
 657}
 658
 659static int ceph_mknod(struct inode *dir, struct dentry *dentry,
 660                      umode_t mode, dev_t rdev)
 661{
 662        struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 663        struct ceph_mds_client *mdsc = fsc->mdsc;
 664        struct ceph_mds_request *req;
 665        int err;
 666
 667        if (ceph_snap(dir) != CEPH_NOSNAP)
 668                return -EROFS;
 669
 670        dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
 671             dir, dentry, mode, rdev);
 672        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
 673        if (IS_ERR(req)) {
 674                d_drop(dentry);
 675                return PTR_ERR(req);
 676        }
 677        req->r_dentry = dget(dentry);
 678        req->r_num_caps = 2;
 679        req->r_locked_dir = dir;
 680        req->r_args.mknod.mode = cpu_to_le32(mode);
 681        req->r_args.mknod.rdev = cpu_to_le32(rdev);
 682        req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
 683        req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 684        err = ceph_mdsc_do_request(mdsc, dir, req);
 685        if (!err && !req->r_reply_info.head->is_dentry)
 686                err = ceph_handle_notrace_create(dir, dentry);
 687        ceph_mdsc_put_request(req);
 688        if (err)
 689                d_drop(dentry);
 690        return err;
 691}
 692
 693static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 694                       bool excl)
 695{
 696        return ceph_mknod(dir, dentry, mode, 0);
 697}
 698
 699static int ceph_symlink(struct inode *dir, struct dentry *dentry,
 700                            const char *dest)
 701{
 702        struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 703        struct ceph_mds_client *mdsc = fsc->mdsc;
 704        struct ceph_mds_request *req;
 705        int err;
 706
 707        if (ceph_snap(dir) != CEPH_NOSNAP)
 708                return -EROFS;
 709
 710        dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
 711        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
 712        if (IS_ERR(req)) {
 713                d_drop(dentry);
 714                return PTR_ERR(req);
 715        }
 716        req->r_dentry = dget(dentry);
 717        req->r_num_caps = 2;
 718        req->r_path2 = kstrdup(dest, GFP_NOFS);
 719        req->r_locked_dir = dir;
 720        req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
 721        req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 722        err = ceph_mdsc_do_request(mdsc, dir, req);
 723        if (!err && !req->r_reply_info.head->is_dentry)
 724                err = ceph_handle_notrace_create(dir, dentry);
 725        ceph_mdsc_put_request(req);
 726        if (err)
 727                d_drop(dentry);
 728        return err;
 729}
 730
 731static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 732{
 733        struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 734        struct ceph_mds_client *mdsc = fsc->mdsc;
 735        struct ceph_mds_request *req;
 736        int err = -EROFS;
 737        int op;
 738
 739        if (ceph_snap(dir) == CEPH_SNAPDIR) {
 740                /* mkdir .snap/foo is a MKSNAP */
 741                op = CEPH_MDS_OP_MKSNAP;
 742                dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
 743                     dentry->d_name.len, dentry->d_name.name, dentry);
 744        } else if (ceph_snap(dir) == CEPH_NOSNAP) {
 745                dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
 746                op = CEPH_MDS_OP_MKDIR;
 747        } else {
 748                goto out;
 749        }
 750        req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
 751        if (IS_ERR(req)) {
 752                err = PTR_ERR(req);
 753                goto out;
 754        }
 755
 756        req->r_dentry = dget(dentry);
 757        req->r_num_caps = 2;
 758        req->r_locked_dir = dir;
 759        req->r_args.mkdir.mode = cpu_to_le32(mode);
 760        req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
 761        req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 762        err = ceph_mdsc_do_request(mdsc, dir, req);
 763        if (!err && !req->r_reply_info.head->is_dentry)
 764                err = ceph_handle_notrace_create(dir, dentry);
 765        ceph_mdsc_put_request(req);
 766out:
 767        if (err < 0)
 768                d_drop(dentry);
 769        return err;
 770}
 771
 772static int ceph_link(struct dentry *old_dentry, struct inode *dir,
 773                     struct dentry *dentry)
 774{
 775        struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 776        struct ceph_mds_client *mdsc = fsc->mdsc;
 777        struct ceph_mds_request *req;
 778        int err;
 779
 780        if (ceph_snap(dir) != CEPH_NOSNAP)
 781                return -EROFS;
 782
 783        dout("link in dir %p old_dentry %p dentry %p\n", dir,
 784             old_dentry, dentry);
 785        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
 786        if (IS_ERR(req)) {
 787                d_drop(dentry);
 788                return PTR_ERR(req);
 789        }
 790        req->r_dentry = dget(dentry);
 791        req->r_num_caps = 2;
 792        req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
 793        req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
 794        req->r_locked_dir = dir;
 795        req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
 796        req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 797        err = ceph_mdsc_do_request(mdsc, dir, req);
 798        if (err) {
 799                d_drop(dentry);
 800        } else if (!req->r_reply_info.head->is_dentry) {
 801                ihold(old_dentry->d_inode);
 802                d_instantiate(dentry, old_dentry->d_inode);
 803        }
 804        ceph_mdsc_put_request(req);
 805        return err;
 806}
 807
 808/*
 809 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps.  If it
 810 * looks like the link count will hit 0, drop any other caps (other
 811 * than PIN) we don't specifically want (due to the file still being
 812 * open).
 813 */
 814static int drop_caps_for_unlink(struct inode *inode)
 815{
 816        struct ceph_inode_info *ci = ceph_inode(inode);
 817        int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
 818
 819        spin_lock(&ci->i_ceph_lock);
 820        if (inode->i_nlink == 1) {
 821                drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
 822                ci->i_ceph_flags |= CEPH_I_NODELAY;
 823        }
 824        spin_unlock(&ci->i_ceph_lock);
 825        return drop;
 826}
 827
 828/*
 829 * rmdir and unlink are differ only by the metadata op code
 830 */
 831static int ceph_unlink(struct inode *dir, struct dentry *dentry)
 832{
 833        struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 834        struct ceph_mds_client *mdsc = fsc->mdsc;
 835        struct inode *inode = dentry->d_inode;
 836        struct ceph_mds_request *req;
 837        int err = -EROFS;
 838        int op;
 839
 840        if (ceph_snap(dir) == CEPH_SNAPDIR) {
 841                /* rmdir .snap/foo is RMSNAP */
 842                dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
 843                     dentry->d_name.name, dentry);
 844                op = CEPH_MDS_OP_RMSNAP;
 845        } else if (ceph_snap(dir) == CEPH_NOSNAP) {
 846                dout("unlink/rmdir dir %p dn %p inode %p\n",
 847                     dir, dentry, inode);
 848                op = S_ISDIR(dentry->d_inode->i_mode) ?
 849                        CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
 850        } else
 851                goto out;
 852        req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
 853        if (IS_ERR(req)) {
 854                err = PTR_ERR(req);
 855                goto out;
 856        }
 857        req->r_dentry = dget(dentry);
 858        req->r_num_caps = 2;
 859        req->r_locked_dir = dir;
 860        req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
 861        req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 862        req->r_inode_drop = drop_caps_for_unlink(inode);
 863        err = ceph_mdsc_do_request(mdsc, dir, req);
 864        if (!err && !req->r_reply_info.head->is_dentry)
 865                d_delete(dentry);
 866        ceph_mdsc_put_request(req);
 867out:
 868        return err;
 869}
 870
 871static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
 872                       struct inode *new_dir, struct dentry *new_dentry)
 873{
 874        struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
 875        struct ceph_mds_client *mdsc = fsc->mdsc;
 876        struct ceph_mds_request *req;
 877        int err;
 878
 879        if (ceph_snap(old_dir) != ceph_snap(new_dir))
 880                return -EXDEV;
 881        if (ceph_snap(old_dir) != CEPH_NOSNAP ||
 882            ceph_snap(new_dir) != CEPH_NOSNAP)
 883                return -EROFS;
 884        dout("rename dir %p dentry %p to dir %p dentry %p\n",
 885             old_dir, old_dentry, new_dir, new_dentry);
 886        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
 887        if (IS_ERR(req))
 888                return PTR_ERR(req);
 889        req->r_dentry = dget(new_dentry);
 890        req->r_num_caps = 2;
 891        req->r_old_dentry = dget(old_dentry);
 892        req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
 893        req->r_locked_dir = new_dir;
 894        req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
 895        req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
 896        req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
 897        req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 898        /* release LINK_RDCACHE on source inode (mds will lock it) */
 899        req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
 900        if (new_dentry->d_inode)
 901                req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
 902        err = ceph_mdsc_do_request(mdsc, old_dir, req);
 903        if (!err && !req->r_reply_info.head->is_dentry) {
 904                /*
 905                 * Normally d_move() is done by fill_trace (called by
 906                 * do_request, above).  If there is no trace, we need
 907                 * to do it here.
 908                 */
 909
 910                /* d_move screws up d_subdirs order */
 911                ceph_dir_clear_complete(new_dir);
 912
 913                d_move(old_dentry, new_dentry);
 914
 915                /* ensure target dentry is invalidated, despite
 916                   rehashing bug in vfs_rename_dir */
 917                ceph_invalidate_dentry_lease(new_dentry);
 918        }
 919        ceph_mdsc_put_request(req);
 920        return err;
 921}
 922
 923/*
 924 * Ensure a dentry lease will no longer revalidate.
 925 */
 926void ceph_invalidate_dentry_lease(struct dentry *dentry)
 927{
 928        spin_lock(&dentry->d_lock);
 929        dentry->d_time = jiffies;
 930        ceph_dentry(dentry)->lease_shared_gen = 0;
 931        spin_unlock(&dentry->d_lock);
 932}
 933
 934/*
 935 * Check if dentry lease is valid.  If not, delete the lease.  Try to
 936 * renew if the least is more than half up.
 937 */
 938static int dentry_lease_is_valid(struct dentry *dentry)
 939{
 940        struct ceph_dentry_info *di;
 941        struct ceph_mds_session *s;
 942        int valid = 0;
 943        u32 gen;
 944        unsigned long ttl;
 945        struct ceph_mds_session *session = NULL;
 946        struct inode *dir = NULL;
 947        u32 seq = 0;
 948
 949        spin_lock(&dentry->d_lock);
 950        di = ceph_dentry(dentry);
 951        if (di->lease_session) {
 952                s = di->lease_session;
 953                spin_lock(&s->s_gen_ttl_lock);
 954                gen = s->s_cap_gen;
 955                ttl = s->s_cap_ttl;
 956                spin_unlock(&s->s_gen_ttl_lock);
 957
 958                if (di->lease_gen == gen &&
 959                    time_before(jiffies, dentry->d_time) &&
 960                    time_before(jiffies, ttl)) {
 961                        valid = 1;
 962                        if (di->lease_renew_after &&
 963                            time_after(jiffies, di->lease_renew_after)) {
 964                                /* we should renew */
 965                                dir = dentry->d_parent->d_inode;
 966                                session = ceph_get_mds_session(s);
 967                                seq = di->lease_seq;
 968                                di->lease_renew_after = 0;
 969                                di->lease_renew_from = jiffies;
 970                        }
 971                }
 972        }
 973        spin_unlock(&dentry->d_lock);
 974
 975        if (session) {
 976                ceph_mdsc_lease_send_msg(session, dir, dentry,
 977                                         CEPH_MDS_LEASE_RENEW, seq);
 978                ceph_put_mds_session(session);
 979        }
 980        dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
 981        return valid;
 982}
 983
 984/*
 985 * Check if directory-wide content lease/cap is valid.
 986 */
 987static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
 988{
 989        struct ceph_inode_info *ci = ceph_inode(dir);
 990        struct ceph_dentry_info *di = ceph_dentry(dentry);
 991        int valid = 0;
 992
 993        spin_lock(&ci->i_ceph_lock);
 994        if (ci->i_shared_gen == di->lease_shared_gen)
 995                valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
 996        spin_unlock(&ci->i_ceph_lock);
 997        dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
 998             dir, (unsigned)ci->i_shared_gen, dentry,
 999             (unsigned)di->lease_shared_gen, valid);
1000        return valid;
1001}
1002
1003/*
1004 * Check if cached dentry can be trusted.
1005 */
1006static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1007{
1008        int valid = 0;
1009        struct inode *dir;
1010
1011        if (flags & LOOKUP_RCU)
1012                return -ECHILD;
1013
1014        dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1015             dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1016             ceph_dentry(dentry)->offset);
1017
1018        dir = ceph_get_dentry_parent_inode(dentry);
1019
1020        /* always trust cached snapped dentries, snapdir dentry */
1021        if (ceph_snap(dir) != CEPH_NOSNAP) {
1022                dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1023                     dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1024                valid = 1;
1025        } else if (dentry->d_inode &&
1026                   ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1027                valid = 1;
1028        } else if (dentry_lease_is_valid(dentry) ||
1029                   dir_lease_is_valid(dir, dentry)) {
1030                valid = 1;
1031        }
1032
1033        dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1034        if (valid)
1035                ceph_dentry_lru_touch(dentry);
1036        else
1037                d_drop(dentry);
1038        iput(dir);
1039        return valid;
1040}
1041
1042/*
1043 * Release our ceph_dentry_info.
1044 */
1045static void ceph_d_release(struct dentry *dentry)
1046{
1047        struct ceph_dentry_info *di = ceph_dentry(dentry);
1048
1049        dout("d_release %p\n", dentry);
1050        ceph_dentry_lru_del(dentry);
1051        if (di->lease_session)
1052                ceph_put_mds_session(di->lease_session);
1053        kmem_cache_free(ceph_dentry_cachep, di);
1054        dentry->d_fsdata = NULL;
1055}
1056
1057static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1058                                          unsigned int flags)
1059{
1060        /*
1061         * Eventually, we'll want to revalidate snapped metadata
1062         * too... probably...
1063         */
1064        return 1;
1065}
1066
1067/*
1068 * Set/clear/test dir complete flag on the dir's dentry.
1069 */
1070void ceph_dir_set_complete(struct inode *inode)
1071{
1072        struct dentry *dentry = d_find_any_alias(inode);
1073        
1074        if (dentry && ceph_dentry(dentry) &&
1075            ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) {
1076                dout(" marking %p (%p) complete\n", inode, dentry);
1077                set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
1078        }
1079        dput(dentry);
1080}
1081
1082void ceph_dir_clear_complete(struct inode *inode)
1083{
1084        struct dentry *dentry = d_find_any_alias(inode);
1085
1086        if (dentry && ceph_dentry(dentry)) {
1087                dout(" marking %p (%p) complete\n", inode, dentry);
1088                set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
1089        }
1090        dput(dentry);
1091}
1092
1093bool ceph_dir_test_complete(struct inode *inode)
1094{
1095        struct dentry *dentry = d_find_any_alias(inode);
1096
1097        if (dentry && ceph_dentry(dentry)) {
1098                dout(" marking %p (%p) NOT complete\n", inode, dentry);
1099                clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
1100        }
1101        dput(dentry);
1102        return false;
1103}
1104
1105/*
1106 * When the VFS prunes a dentry from the cache, we need to clear the
1107 * complete flag on the parent directory.
1108 *
1109 * Called under dentry->d_lock.
1110 */
1111static void ceph_d_prune(struct dentry *dentry)
1112{
1113        struct ceph_dentry_info *di;
1114
1115        dout("ceph_d_prune %p\n", dentry);
1116
1117        /* do we have a valid parent? */
1118        if (IS_ROOT(dentry))
1119                return;
1120
1121        /* if we are not hashed, we don't affect D_COMPLETE */
1122        if (d_unhashed(dentry))
1123                return;
1124
1125        /*
1126         * we hold d_lock, so d_parent is stable, and d_fsdata is never
1127         * cleared until d_release
1128         */
1129        di = ceph_dentry(dentry->d_parent);
1130        clear_bit(CEPH_D_COMPLETE, &di->flags);
1131}
1132
1133/*
1134 * read() on a dir.  This weird interface hack only works if mounted
1135 * with '-o dirstat'.
1136 */
1137static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1138                             loff_t *ppos)
1139{
1140        struct ceph_file_info *cf = file->private_data;
1141        struct inode *inode = file->f_dentry->d_inode;
1142        struct ceph_inode_info *ci = ceph_inode(inode);
1143        int left;
1144        const int bufsize = 1024;
1145
1146        if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1147                return -EISDIR;
1148
1149        if (!cf->dir_info) {
1150                cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1151                if (!cf->dir_info)
1152                        return -ENOMEM;
1153                cf->dir_info_len =
1154                        snprintf(cf->dir_info, bufsize,
1155                                "entries:   %20lld\n"
1156                                " files:    %20lld\n"
1157                                " subdirs:  %20lld\n"
1158                                "rentries:  %20lld\n"
1159                                " rfiles:   %20lld\n"
1160                                " rsubdirs: %20lld\n"
1161                                "rbytes:    %20lld\n"
1162                                "rctime:    %10ld.%09ld\n",
1163                                ci->i_files + ci->i_subdirs,
1164                                ci->i_files,
1165                                ci->i_subdirs,
1166                                ci->i_rfiles + ci->i_rsubdirs,
1167                                ci->i_rfiles,
1168                                ci->i_rsubdirs,
1169                                ci->i_rbytes,
1170                                (long)ci->i_rctime.tv_sec,
1171                                (long)ci->i_rctime.tv_nsec);
1172        }
1173
1174        if (*ppos >= cf->dir_info_len)
1175                return 0;
1176        size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1177        left = copy_to_user(buf, cf->dir_info + *ppos, size);
1178        if (left == size)
1179                return -EFAULT;
1180        *ppos += (size - left);
1181        return size - left;
1182}
1183
1184/*
1185 * an fsync() on a dir will wait for any uncommitted directory
1186 * operations to commit.
1187 */
1188static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1189                          int datasync)
1190{
1191        struct inode *inode = file->f_path.dentry->d_inode;
1192        struct ceph_inode_info *ci = ceph_inode(inode);
1193        struct list_head *head = &ci->i_unsafe_dirops;
1194        struct ceph_mds_request *req;
1195        u64 last_tid;
1196        int ret = 0;
1197
1198        dout("dir_fsync %p\n", inode);
1199        ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1200        if (ret)
1201                return ret;
1202        mutex_lock(&inode->i_mutex);
1203
1204        spin_lock(&ci->i_unsafe_lock);
1205        if (list_empty(head))
1206                goto out;
1207
1208        req = list_entry(head->prev,
1209                         struct ceph_mds_request, r_unsafe_dir_item);
1210        last_tid = req->r_tid;
1211
1212        do {
1213                ceph_mdsc_get_request(req);
1214                spin_unlock(&ci->i_unsafe_lock);
1215
1216                dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1217                     inode, req->r_tid, last_tid);
1218                if (req->r_timeout) {
1219                        ret = wait_for_completion_timeout(
1220                                &req->r_safe_completion, req->r_timeout);
1221                        if (ret > 0)
1222                                ret = 0;
1223                        else if (ret == 0)
1224                                ret = -EIO;  /* timed out */
1225                } else {
1226                        wait_for_completion(&req->r_safe_completion);
1227                }
1228                ceph_mdsc_put_request(req);
1229
1230                spin_lock(&ci->i_unsafe_lock);
1231                if (ret || list_empty(head))
1232                        break;
1233                req = list_entry(head->next,
1234                                 struct ceph_mds_request, r_unsafe_dir_item);
1235        } while (req->r_tid < last_tid);
1236out:
1237        spin_unlock(&ci->i_unsafe_lock);
1238        mutex_unlock(&inode->i_mutex);
1239
1240        return ret;
1241}
1242
1243/*
1244 * We maintain a private dentry LRU.
1245 *
1246 * FIXME: this needs to be changed to a per-mds lru to be useful.
1247 */
1248void ceph_dentry_lru_add(struct dentry *dn)
1249{
1250        struct ceph_dentry_info *di = ceph_dentry(dn);
1251        struct ceph_mds_client *mdsc;
1252
1253        dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1254             dn->d_name.len, dn->d_name.name);
1255        mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1256        spin_lock(&mdsc->dentry_lru_lock);
1257        list_add_tail(&di->lru, &mdsc->dentry_lru);
1258        mdsc->num_dentry++;
1259        spin_unlock(&mdsc->dentry_lru_lock);
1260}
1261
1262void ceph_dentry_lru_touch(struct dentry *dn)
1263{
1264        struct ceph_dentry_info *di = ceph_dentry(dn);
1265        struct ceph_mds_client *mdsc;
1266
1267        dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1268             dn->d_name.len, dn->d_name.name, di->offset);
1269        mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1270        spin_lock(&mdsc->dentry_lru_lock);
1271        list_move_tail(&di->lru, &mdsc->dentry_lru);
1272        spin_unlock(&mdsc->dentry_lru_lock);
1273}
1274
1275void ceph_dentry_lru_del(struct dentry *dn)
1276{
1277        struct ceph_dentry_info *di = ceph_dentry(dn);
1278        struct ceph_mds_client *mdsc;
1279
1280        dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1281             dn->d_name.len, dn->d_name.name);
1282        mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1283        spin_lock(&mdsc->dentry_lru_lock);
1284        list_del_init(&di->lru);
1285        mdsc->num_dentry--;
1286        spin_unlock(&mdsc->dentry_lru_lock);
1287}
1288
1289/*
1290 * Return name hash for a given dentry.  This is dependent on
1291 * the parent directory's hash function.
1292 */
1293unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1294{
1295        struct ceph_inode_info *dci = ceph_inode(dir);
1296
1297        switch (dci->i_dir_layout.dl_dir_hash) {
1298        case 0: /* for backward compat */
1299        case CEPH_STR_HASH_LINUX:
1300                return dn->d_name.hash;
1301
1302        default:
1303                return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1304                                     dn->d_name.name, dn->d_name.len);
1305        }
1306}
1307
1308const struct file_operations ceph_dir_fops = {
1309        .read = ceph_read_dir,
1310        .readdir = ceph_readdir,
1311        .llseek = ceph_dir_llseek,
1312        .open = ceph_open,
1313        .release = ceph_release,
1314        .unlocked_ioctl = ceph_ioctl,
1315        .fsync = ceph_dir_fsync,
1316};
1317
1318const struct inode_operations ceph_dir_iops = {
1319        .lookup = ceph_lookup,
1320        .permission = ceph_permission,
1321        .getattr = ceph_getattr,
1322        .setattr = ceph_setattr,
1323        .setxattr = ceph_setxattr,
1324        .getxattr = ceph_getxattr,
1325        .listxattr = ceph_listxattr,
1326        .removexattr = ceph_removexattr,
1327        .mknod = ceph_mknod,
1328        .symlink = ceph_symlink,
1329        .mkdir = ceph_mkdir,
1330        .link = ceph_link,
1331        .unlink = ceph_unlink,
1332        .rmdir = ceph_unlink,
1333        .rename = ceph_rename,
1334        .create = ceph_create,
1335        .atomic_open = ceph_atomic_open,
1336};
1337
1338const struct dentry_operations ceph_dentry_ops = {
1339        .d_revalidate = ceph_d_revalidate,
1340        .d_release = ceph_d_release,
1341        .d_prune = ceph_d_prune,
1342};
1343
1344const struct dentry_operations ceph_snapdir_dentry_ops = {
1345        .d_revalidate = ceph_snapdir_d_revalidate,
1346        .d_release = ceph_d_release,
1347};
1348
1349const struct dentry_operations ceph_snap_dentry_ops = {
1350        .d_release = ceph_d_release,
1351        .d_prune = ceph_d_prune,
1352};
1353
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