dir.c 34.4 KB
Newer Older
1
#include <linux/ceph/ceph_debug.h>
S
Sage Weil 已提交
2 3 4 5

#include <linux/spinlock.h>
#include <linux/fs_struct.h>
#include <linux/namei.h>
6
#include <linux/slab.h>
S
Sage Weil 已提交
7 8 9
#include <linux/sched.h>

#include "super.h"
10
#include "mds_client.h"
S
Sage Weil 已提交
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

/*
 * Directory operations: readdir, lookup, create, link, unlink,
 * rename, etc.
 */

/*
 * Ceph MDS operations are specified in terms of a base ino and
 * relative path.  Thus, the client can specify an operation on a
 * specific inode (e.g., a getattr due to fstat(2)), or as a path
 * relative to, say, the root directory.
 *
 * Normally, we limit ourselves to strict inode ops (no path component)
 * or dentry operations (a single path component relative to an ino).  The
 * exception to this is open_root_dentry(), which will open the mount
 * point by name.
 */

const struct inode_operations ceph_dir_iops;
const struct file_operations ceph_dir_fops;
S
Sage Weil 已提交
31
const struct dentry_operations ceph_dentry_ops;
S
Sage Weil 已提交
32 33 34 35 36 37 38 39 40 41 42

/*
 * Initialize ceph dentry state.
 */
int ceph_init_dentry(struct dentry *dentry)
{
	struct ceph_dentry_info *di;

	if (dentry->d_fsdata)
		return 0;

43 44
	if (dentry->d_parent == NULL ||   /* nfs fh_to_dentry */
	    ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
45
		d_set_d_op(dentry, &ceph_dentry_ops);
S
Sage Weil 已提交
46
	else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
47
		d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
S
Sage Weil 已提交
48
	else
49
		d_set_d_op(dentry, &ceph_snap_dentry_ops);
S
Sage Weil 已提交
50

51
	di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
S
Sage Weil 已提交
52 53 54 55
	if (!di)
		return -ENOMEM;          /* oh well */

	spin_lock(&dentry->d_lock);
56 57 58
	if (dentry->d_fsdata) {
		/* lost a race */
		kmem_cache_free(ceph_dentry_cachep, di);
S
Sage Weil 已提交
59
		goto out_unlock;
60
	}
S
Sage Weil 已提交
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
	di->dentry = dentry;
	di->lease_session = NULL;
	dentry->d_fsdata = di;
	dentry->d_time = jiffies;
	ceph_dentry_lru_add(dentry);
out_unlock:
	spin_unlock(&dentry->d_lock);
	return 0;
}



/*
 * for readdir, we encode the directory frag and offset within that
 * frag into f_pos.
 */
static unsigned fpos_frag(loff_t p)
{
	return p >> 32;
}
static unsigned fpos_off(loff_t p)
{
	return p & 0xffffffff;
}

/*
 * When possible, we try to satisfy a readdir by peeking at the
 * dcache.  We make this work by carefully ordering dentries on
 * d_u.d_child when we initially get results back from the MDS, and
 * falling back to a "normal" sync readdir if any dentries in the dir
 * are dropped.
 *
 * I_COMPLETE tells indicates we have all dentries in the dir.  It is
 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
 * the MDS if/when the directory is modified).
 */
static int __dcache_readdir(struct file *filp,
			    void *dirent, filldir_t filldir)
{
	struct ceph_file_info *fi = filp->private_data;
	struct dentry *parent = filp->f_dentry;
	struct inode *dir = parent->d_inode;
	struct list_head *p;
	struct dentry *dentry, *last;
	struct ceph_dentry_info *di;
	int err = 0;

	/* claim ref on last dentry we returned */
	last = fi->dentry;
	fi->dentry = NULL;

	dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
	     last);

N
Nick Piggin 已提交
115
	spin_lock(&parent->d_lock);
S
Sage Weil 已提交
116 117

	/* start at beginning? */
118 119
	if (filp->f_pos == 2 || last == NULL ||
	    filp->f_pos < ceph_dentry(last)->offset) {
S
Sage Weil 已提交
120 121 122 123 124 125 126 127 128 129 130 131
		if (list_empty(&parent->d_subdirs))
			goto out_unlock;
		p = parent->d_subdirs.prev;
		dout(" initial p %p/%p\n", p->prev, p->next);
	} else {
		p = last->d_u.d_child.prev;
	}

more:
	dentry = list_entry(p, struct dentry, d_u.d_child);
	di = ceph_dentry(dentry);
	while (1) {
S
Sage Weil 已提交
132 133
		dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
		     d_unhashed(dentry) ? "!hashed" : "hashed",
S
Sage Weil 已提交
134 135 136 137 138
		     parent->d_subdirs.prev, parent->d_subdirs.next);
		if (p == &parent->d_subdirs) {
			fi->at_end = 1;
			goto out_unlock;
		}
N
Nick Piggin 已提交
139
		spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
S
Sage Weil 已提交
140
		if (!d_unhashed(dentry) && dentry->d_inode &&
141
		    ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
S
Sage Weil 已提交
142
		    ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
S
Sage Weil 已提交
143 144 145 146 147 148
		    filp->f_pos <= di->offset)
			break;
		dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
		     dentry->d_name.len, dentry->d_name.name, di->offset,
		     filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
		     !dentry->d_inode ? " null" : "");
N
Nick Piggin 已提交
149
		spin_unlock(&dentry->d_lock);
S
Sage Weil 已提交
150 151 152 153 154
		p = p->prev;
		dentry = list_entry(p, struct dentry, d_u.d_child);
		di = ceph_dentry(dentry);
	}

N
Nick Piggin 已提交
155
	dget_dlock(dentry);
N
Nick Piggin 已提交
156
	spin_unlock(&dentry->d_lock);
N
Nick Piggin 已提交
157
	spin_unlock(&parent->d_lock);
S
Sage Weil 已提交
158 159 160 161 162 163

	dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
	     dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
	filp->f_pos = di->offset;
	err = filldir(dirent, dentry->d_name.name,
		      dentry->d_name.len, di->offset,
Y
Yehuda Sadeh 已提交
164
		      ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
S
Sage Weil 已提交
165 166 167 168 169 170 171 172 173 174 175
		      dentry->d_inode->i_mode >> 12);

	if (last) {
		if (err < 0) {
			/* remember our position */
			fi->dentry = last;
			fi->next_offset = di->offset;
		} else {
			dput(last);
		}
	}
176 177
	last = dentry;

S
Sage Weil 已提交
178
	if (err < 0)
179
		goto out;
S
Sage Weil 已提交
180 181 182

	filp->f_pos++;

N
Nick Piggin 已提交
183
	/* make sure a dentry wasn't dropped while we didn't have parent lock */
184 185 186 187 188 189
	if (!ceph_i_test(dir, CEPH_I_COMPLETE)) {
		dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
		err = -EAGAIN;
		goto out;
	}

N
Nick Piggin 已提交
190
	spin_lock(&parent->d_lock);
191 192
	p = p->prev;	/* advance to next dentry */
	goto more;
S
Sage Weil 已提交
193 194

out_unlock:
N
Nick Piggin 已提交
195
	spin_unlock(&parent->d_lock);
196 197
out:
	if (last)
S
Sage Weil 已提交
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225
		dput(last);
	return err;
}

/*
 * make note of the last dentry we read, so we can
 * continue at the same lexicographical point,
 * regardless of what dir changes take place on the
 * server.
 */
static int note_last_dentry(struct ceph_file_info *fi, const char *name,
			    int len)
{
	kfree(fi->last_name);
	fi->last_name = kmalloc(len+1, GFP_NOFS);
	if (!fi->last_name)
		return -ENOMEM;
	memcpy(fi->last_name, name, len);
	fi->last_name[len] = 0;
	dout("note_last_dentry '%s'\n", fi->last_name);
	return 0;
}

static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct ceph_file_info *fi = filp->private_data;
	struct inode *inode = filp->f_dentry->d_inode;
	struct ceph_inode_info *ci = ceph_inode(inode);
226 227
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
228 229 230 231 232
	unsigned frag = fpos_frag(filp->f_pos);
	int off = fpos_off(filp->f_pos);
	int err;
	u32 ftype;
	struct ceph_mds_reply_info_parsed *rinfo;
233 234
	const int max_entries = fsc->mount_options->max_readdir;
	const int max_bytes = fsc->mount_options->max_readdir_bytes;
S
Sage Weil 已提交
235 236 237 238 239 240 241 242 243 244 245 246 247

	dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
	if (fi->at_end)
		return 0;

	/* always start with . and .. */
	if (filp->f_pos == 0) {
		/* note dir version at start of readdir so we can tell
		 * if any dentries get dropped */
		fi->dir_release_count = ci->i_release_count;

		dout("readdir off 0 -> '.'\n");
		if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
Y
Yehuda Sadeh 已提交
248 249
			    ceph_translate_ino(inode->i_sb, inode->i_ino),
			    inode->i_mode >> 12) < 0)
S
Sage Weil 已提交
250 251 252 253 254
			return 0;
		filp->f_pos = 1;
		off = 1;
	}
	if (filp->f_pos == 1) {
Y
Yehuda Sadeh 已提交
255
		ino_t ino = filp->f_dentry->d_parent->d_inode->i_ino;
S
Sage Weil 已提交
256 257
		dout("readdir off 1 -> '..'\n");
		if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
Y
Yehuda Sadeh 已提交
258
			    ceph_translate_ino(inode->i_sb, ino),
S
Sage Weil 已提交
259 260 261 262 263 264 265 266 267
			    inode->i_mode >> 12) < 0)
			return 0;
		filp->f_pos = 2;
		off = 2;
	}

	/* can we use the dcache? */
	spin_lock(&inode->i_lock);
	if ((filp->f_pos == 2 || fi->dentry) &&
268
	    !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
269
	    ceph_snap(inode) != CEPH_SNAPDIR &&
S
Sage Weil 已提交
270 271
	    (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
272
		spin_unlock(&inode->i_lock);
S
Sage Weil 已提交
273
		err = __dcache_readdir(filp, dirent, filldir);
274
		if (err != -EAGAIN)
S
Sage Weil 已提交
275
			return err;
276 277
	} else {
		spin_unlock(&inode->i_lock);
S
Sage Weil 已提交
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
	}
	if (fi->dentry) {
		err = note_last_dentry(fi, fi->dentry->d_name.name,
				       fi->dentry->d_name.len);
		if (err)
			return err;
		dput(fi->dentry);
		fi->dentry = NULL;
	}

	/* proceed with a normal readdir */

more:
	/* do we have the correct frag content buffered? */
	if (fi->frag != frag || fi->last_readdir == NULL) {
		struct ceph_mds_request *req;
		int op = ceph_snap(inode) == CEPH_SNAPDIR ?
			CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;

		/* discard old result, if any */
298
		if (fi->last_readdir) {
S
Sage Weil 已提交
299
			ceph_mdsc_put_request(fi->last_readdir);
300 301
			fi->last_readdir = NULL;
		}
S
Sage Weil 已提交
302 303 304 305 306 307 308 309 310

		/* requery frag tree, as the frag topology may have changed */
		frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);

		dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
		     ceph_vinop(inode), frag, fi->last_name);
		req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
		if (IS_ERR(req))
			return PTR_ERR(req);
311 312
		req->r_inode = inode;
		ihold(inode);
S
Sage Weil 已提交
313 314 315 316 317 318 319 320 321
		req->r_dentry = dget(filp->f_dentry);
		/* hints to request -> mds selection code */
		req->r_direct_mode = USE_AUTH_MDS;
		req->r_direct_hash = ceph_frag_value(frag);
		req->r_direct_is_hash = true;
		req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
		req->r_readdir_offset = fi->next_offset;
		req->r_args.readdir.frag = cpu_to_le32(frag);
		req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
322
		req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
323
		req->r_num_caps = max_entries + 1;
S
Sage Weil 已提交
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345
		err = ceph_mdsc_do_request(mdsc, NULL, req);
		if (err < 0) {
			ceph_mdsc_put_request(req);
			return err;
		}
		dout("readdir got and parsed readdir result=%d"
		     " on frag %x, end=%d, complete=%d\n", err, frag,
		     (int)req->r_reply_info.dir_end,
		     (int)req->r_reply_info.dir_complete);

		if (!req->r_did_prepopulate) {
			dout("readdir !did_prepopulate");
			fi->dir_release_count--;    /* preclude I_COMPLETE */
		}

		/* note next offset and last dentry name */
		fi->offset = fi->next_offset;
		fi->last_readdir = req;

		if (req->r_reply_info.dir_end) {
			kfree(fi->last_name);
			fi->last_name = NULL;
346 347 348 349
			if (ceph_frag_is_rightmost(frag))
				fi->next_offset = 2;
			else
				fi->next_offset = 0;
S
Sage Weil 已提交
350 351 352 353 354 355 356 357 358 359 360 361 362 363
		} else {
			rinfo = &req->r_reply_info;
			err = note_last_dentry(fi,
				       rinfo->dir_dname[rinfo->dir_nr-1],
				       rinfo->dir_dname_len[rinfo->dir_nr-1]);
			if (err)
				return err;
			fi->next_offset += rinfo->dir_nr;
		}
	}

	rinfo = &fi->last_readdir->r_reply_info;
	dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
	     rinfo->dir_nr, off, fi->offset);
364
	while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
S
Sage Weil 已提交
365 366 367
		u64 pos = ceph_make_fpos(frag, off);
		struct ceph_mds_reply_inode *in =
			rinfo->dir_in[off - fi->offset].in;
368 369 370
		struct ceph_vino vino;
		ino_t ino;

S
Sage Weil 已提交
371 372 373 374 375 376
		dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
		     off, off - fi->offset, rinfo->dir_nr, pos,
		     rinfo->dir_dname_len[off - fi->offset],
		     rinfo->dir_dname[off - fi->offset], in);
		BUG_ON(!in);
		ftype = le32_to_cpu(in->mode) >> 12;
377 378 379
		vino.ino = le64_to_cpu(in->ino);
		vino.snap = le64_to_cpu(in->snapid);
		ino = ceph_vino_to_ino(vino);
S
Sage Weil 已提交
380 381 382
		if (filldir(dirent,
			    rinfo->dir_dname[off - fi->offset],
			    rinfo->dir_dname_len[off - fi->offset],
Y
Yehuda Sadeh 已提交
383 384
			    pos,
			    ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
S
Sage Weil 已提交
385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415
			dout("filldir stopping us...\n");
			return 0;
		}
		off++;
		filp->f_pos = pos + 1;
	}

	if (fi->last_name) {
		ceph_mdsc_put_request(fi->last_readdir);
		fi->last_readdir = NULL;
		goto more;
	}

	/* more frags? */
	if (!ceph_frag_is_rightmost(frag)) {
		frag = ceph_frag_next(frag);
		off = 0;
		filp->f_pos = ceph_make_fpos(frag, off);
		dout("readdir next frag is %x\n", frag);
		goto more;
	}
	fi->at_end = 1;

	/*
	 * if dir_release_count still matches the dir, no dentries
	 * were released during the whole readdir, and we should have
	 * the complete dir contents in our cache.
	 */
	spin_lock(&inode->i_lock);
	if (ci->i_release_count == fi->dir_release_count) {
		dout(" marking %p complete\n", inode);
S
Sage Weil 已提交
416
		/* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
S
Sage Weil 已提交
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431
		ci->i_max_offset = filp->f_pos;
	}
	spin_unlock(&inode->i_lock);

	dout("readdir %p filp %p done.\n", inode, filp);
	return 0;
}

static void reset_readdir(struct ceph_file_info *fi)
{
	if (fi->last_readdir) {
		ceph_mdsc_put_request(fi->last_readdir);
		fi->last_readdir = NULL;
	}
	kfree(fi->last_name);
S
Sage Weil 已提交
432
	fi->last_name = NULL;
S
Sage Weil 已提交
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
	fi->next_offset = 2;  /* compensate for . and .. */
	if (fi->dentry) {
		dput(fi->dentry);
		fi->dentry = NULL;
	}
	fi->at_end = 0;
}

static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
{
	struct ceph_file_info *fi = file->private_data;
	struct inode *inode = file->f_mapping->host;
	loff_t old_offset = offset;
	loff_t retval;

	mutex_lock(&inode->i_mutex);
	switch (origin) {
	case SEEK_END:
		offset += inode->i_size + 2;   /* FIXME */
		break;
	case SEEK_CUR:
		offset += file->f_pos;
	}
	retval = -EINVAL;
	if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
		if (offset != file->f_pos) {
			file->f_pos = offset;
			file->f_version = 0;
			fi->at_end = 0;
		}
		retval = offset;

		/*
		 * discard buffered readdir content on seekdir(0), or
		 * seek to new frag, or seek prior to current chunk.
		 */
		if (offset == 0 ||
		    fpos_frag(offset) != fpos_frag(old_offset) ||
		    fpos_off(offset) < fi->offset) {
			dout("dir_llseek dropping %p content\n", file);
			reset_readdir(fi);
		}

		/* bump dir_release_count if we did a forward seek */
		if (offset > old_offset)
			fi->dir_release_count--;
	}
	mutex_unlock(&inode->i_mutex);
	return retval;
}

/*
 * Process result of a lookup/open request.
 *
 * Mainly, make sure we return the final req->r_dentry (if it already
 * existed) in place of the original VFS-provided dentry when they
 * differ.
 *
 * Gracefully handle the case where the MDS replies with -ENOENT and
 * no trace (which it may do, at its discretion, e.g., if it doesn't
 * care to issue a lease on the negative dentry).
 */
struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
				  struct dentry *dentry, int err)
{
498
	struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
S
Sage Weil 已提交
499 500 501 502
	struct inode *parent = dentry->d_parent->d_inode;

	/* .snap dir? */
	if (err == -ENOENT &&
503
	    ceph_snap(parent) == CEPH_NOSNAP &&
504
	    strcmp(dentry->d_name.name,
505
		   fsc->mount_options->snapdir_name) == 0) {
S
Sage Weil 已提交
506 507 508
		struct inode *inode = ceph_get_snapdir(parent);
		dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
		     dentry, dentry->d_name.len, dentry->d_name.name, inode);
509
		BUG_ON(!d_unhashed(dentry));
S
Sage Weil 已提交
510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
		d_add(dentry, inode);
		err = 0;
	}

	if (err == -ENOENT) {
		/* no trace? */
		err = 0;
		if (!req->r_reply_info.head->is_dentry) {
			dout("ENOENT and no trace, dentry %p inode %p\n",
			     dentry, dentry->d_inode);
			if (dentry->d_inode) {
				d_drop(dentry);
				err = -ENOENT;
			} else {
				d_add(dentry, NULL);
			}
		}
	}
	if (err)
		dentry = ERR_PTR(err);
	else if (dentry != req->r_dentry)
		dentry = dget(req->r_dentry);   /* we got spliced */
	else
		dentry = NULL;
	return dentry;
}

S
Sage Weil 已提交
537 538 539 540 541 542
static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
{
	return ceph_ino(inode) == CEPH_INO_ROOT &&
		strncmp(dentry->d_name.name, ".ceph", 5) == 0;
}

S
Sage Weil 已提交
543 544 545 546 547 548 549
/*
 * Look up a single dir entry.  If there is a lookup intent, inform
 * the MDS so that it gets our 'caps wanted' value in a single op.
 */
static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
				  struct nameidata *nd)
{
550 551
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582
	struct ceph_mds_request *req;
	int op;
	int err;

	dout("lookup %p dentry %p '%.*s'\n",
	     dir, dentry, dentry->d_name.len, dentry->d_name.name);

	if (dentry->d_name.len > NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

	err = ceph_init_dentry(dentry);
	if (err < 0)
		return ERR_PTR(err);

	/* open (but not create!) intent? */
	if (nd &&
	    (nd->flags & LOOKUP_OPEN) &&
	    (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */
	    !(nd->intent.open.flags & O_CREAT)) {
		int mode = nd->intent.open.create_mode & ~current->fs->umask;
		return ceph_lookup_open(dir, dentry, nd, mode, 1);
	}

	/* can we conclude ENOENT locally? */
	if (dentry->d_inode == NULL) {
		struct ceph_inode_info *ci = ceph_inode(dir);
		struct ceph_dentry_info *di = ceph_dentry(dentry);

		spin_lock(&dir->i_lock);
		dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
		if (strncmp(dentry->d_name.name,
583
			    fsc->mount_options->snapdir_name,
S
Sage Weil 已提交
584
			    dentry->d_name.len) &&
S
Sage Weil 已提交
585
		    !is_root_ceph_dentry(dir, dentry) &&
S
Sage Weil 已提交
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600
		    (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
		    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
			spin_unlock(&dir->i_lock);
			dout(" dir %p complete, -ENOENT\n", dir);
			d_add(dentry, NULL);
			di->lease_shared_gen = ci->i_shared_gen;
			return NULL;
		}
		spin_unlock(&dir->i_lock);
	}

	op = ceph_snap(dir) == CEPH_SNAPDIR ?
		CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
	req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
	if (IS_ERR(req))
J
Julia Lawall 已提交
601
		return ERR_CAST(req);
S
Sage Weil 已提交
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	/* we only need inode linkage */
	req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
	req->r_locked_dir = dir;
	err = ceph_mdsc_do_request(mdsc, NULL, req);
	dentry = ceph_finish_lookup(req, dentry, err);
	ceph_mdsc_put_request(req);  /* will dput(dentry) */
	dout("lookup result=%p\n", dentry);
	return dentry;
}

/*
 * If we do a create but get no trace back from the MDS, follow up with
 * a lookup (the VFS expects us to link up the provided dentry).
 */
int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
{
	struct dentry *result = ceph_lookup(dir, dentry, NULL);

	if (result && !IS_ERR(result)) {
		/*
		 * We created the item, then did a lookup, and found
		 * it was already linked to another inode we already
		 * had in our cache (and thus got spliced).  Link our
		 * dentry to that inode, but don't hash it, just in
		 * case the VFS wants to dereference it.
		 */
		BUG_ON(!result->d_inode);
		d_instantiate(dentry, result->d_inode);
		return 0;
	}
	return PTR_ERR(result);
}

static int ceph_mknod(struct inode *dir, struct dentry *dentry,
		      int mode, dev_t rdev)
{
640 641
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
	     dir, dentry, mode, rdev);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		d_drop(dentry);
		return PTR_ERR(req);
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_locked_dir = dir;
	req->r_args.mknod.mode = cpu_to_le32(mode);
	req->r_args.mknod.rdev = cpu_to_le32(rdev);
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);
	ceph_mdsc_put_request(req);
	if (err)
		d_drop(dentry);
	return err;
}

static int ceph_create(struct inode *dir, struct dentry *dentry, int mode,
		       struct nameidata *nd)
{
	dout("create in dir %p dentry %p name '%.*s'\n",
	     dir, dentry, dentry->d_name.len, dentry->d_name.name);

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	if (nd) {
		BUG_ON((nd->flags & LOOKUP_OPEN) == 0);
		dentry = ceph_lookup_open(dir, dentry, nd, mode, 0);
		/* hrm, what should i do here if we get aliased? */
		if (IS_ERR(dentry))
			return PTR_ERR(dentry);
		return 0;
	}

	/* fall back to mknod */
	return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0);
}

static int ceph_symlink(struct inode *dir, struct dentry *dentry,
			    const char *dest)
{
696 697
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		d_drop(dentry);
		return PTR_ERR(req);
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_path2 = kstrdup(dest, GFP_NOFS);
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);
	ceph_mdsc_put_request(req);
	if (err)
		d_drop(dentry);
	return err;
}

static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
727 728
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
	struct ceph_mds_request *req;
	int err = -EROFS;
	int op;

	if (ceph_snap(dir) == CEPH_SNAPDIR) {
		/* mkdir .snap/foo is a MKSNAP */
		op = CEPH_MDS_OP_MKSNAP;
		dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
		     dentry->d_name.len, dentry->d_name.name, dentry);
	} else if (ceph_snap(dir) == CEPH_NOSNAP) {
		dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode);
		op = CEPH_MDS_OP_MKDIR;
	} else {
		goto out;
	}
	req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}

	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_locked_dir = dir;
	req->r_args.mkdir.mode = cpu_to_le32(mode);
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);
	ceph_mdsc_put_request(req);
out:
	if (err < 0)
		d_drop(dentry);
	return err;
}

static int ceph_link(struct dentry *old_dentry, struct inode *dir,
		     struct dentry *dentry)
{
769 770
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	dout("link in dir %p old_dentry %p dentry %p\n", dir,
	     old_dentry, dentry);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		d_drop(dentry);
		return PTR_ERR(req);
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
791
	if (err) {
S
Sage Weil 已提交
792
		d_drop(dentry);
793 794 795 796
	} else if (!req->r_reply_info.head->is_dentry) {
		ihold(old_dentry->d_inode);
		d_instantiate(dentry, old_dentry->d_inode);
	}
S
Sage Weil 已提交
797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
	ceph_mdsc_put_request(req);
	return err;
}

/*
 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps.  If it
 * looks like the link count will hit 0, drop any other caps (other
 * than PIN) we don't specifically want (due to the file still being
 * open).
 */
static int drop_caps_for_unlink(struct inode *inode)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;

	spin_lock(&inode->i_lock);
	if (inode->i_nlink == 1) {
		drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
		ci->i_ceph_flags |= CEPH_I_NODELAY;
	}
	spin_unlock(&inode->i_lock);
	return drop;
}

/*
 * rmdir and unlink are differ only by the metadata op code
 */
static int ceph_unlink(struct inode *dir, struct dentry *dentry)
{
826 827
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
	struct inode *inode = dentry->d_inode;
	struct ceph_mds_request *req;
	int err = -EROFS;
	int op;

	if (ceph_snap(dir) == CEPH_SNAPDIR) {
		/* rmdir .snap/foo is RMSNAP */
		dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
		     dentry->d_name.name, dentry);
		op = CEPH_MDS_OP_RMSNAP;
	} else if (ceph_snap(dir) == CEPH_NOSNAP) {
		dout("unlink/rmdir dir %p dn %p inode %p\n",
		     dir, dentry, inode);
		op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ?
			CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
	} else
		goto out;
	req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	req->r_inode_drop = drop_caps_for_unlink(inode);
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		d_delete(dentry);
	ceph_mdsc_put_request(req);
out:
	return err;
}

static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
		       struct inode *new_dir, struct dentry *new_dentry)
{
867 868
	struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(old_dir) != ceph_snap(new_dir))
		return -EXDEV;
	if (ceph_snap(old_dir) != CEPH_NOSNAP ||
	    ceph_snap(new_dir) != CEPH_NOSNAP)
		return -EROFS;
	dout("rename dir %p dentry %p to dir %p dentry %p\n",
	     old_dir, old_dentry, new_dir, new_dentry);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);
	req->r_dentry = dget(new_dentry);
	req->r_num_caps = 2;
	req->r_old_dentry = dget(old_dentry);
	req->r_locked_dir = new_dir;
	req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	/* release LINK_RDCACHE on source inode (mds will lock it) */
	req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
	if (new_dentry->d_inode)
		req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
	err = ceph_mdsc_do_request(mdsc, old_dir, req);
	if (!err && !req->r_reply_info.head->is_dentry) {
		/*
		 * Normally d_move() is done by fill_trace (called by
		 * do_request, above).  If there is no trace, we need
		 * to do it here.
		 */
901 902 903 904

		/* d_move screws up d_subdirs order */
		ceph_i_clear(new_dir, CEPH_I_COMPLETE);

S
Sage Weil 已提交
905
		d_move(old_dentry, new_dentry);
906 907 908

		/* ensure target dentry is invalidated, despite
		   rehashing bug in vfs_rename_dir */
909
		ceph_invalidate_dentry_lease(new_dentry);
S
Sage Weil 已提交
910 911 912 913 914
	}
	ceph_mdsc_put_request(req);
	return err;
}

915 916 917 918 919 920 921 922 923 924
/*
 * Ensure a dentry lease will no longer revalidate.
 */
void ceph_invalidate_dentry_lease(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	dentry->d_time = jiffies;
	ceph_dentry(dentry)->lease_shared_gen = 0;
	spin_unlock(&dentry->d_lock);
}
S
Sage Weil 已提交
925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999

/*
 * Check if dentry lease is valid.  If not, delete the lease.  Try to
 * renew if the least is more than half up.
 */
static int dentry_lease_is_valid(struct dentry *dentry)
{
	struct ceph_dentry_info *di;
	struct ceph_mds_session *s;
	int valid = 0;
	u32 gen;
	unsigned long ttl;
	struct ceph_mds_session *session = NULL;
	struct inode *dir = NULL;
	u32 seq = 0;

	spin_lock(&dentry->d_lock);
	di = ceph_dentry(dentry);
	if (di && di->lease_session) {
		s = di->lease_session;
		spin_lock(&s->s_cap_lock);
		gen = s->s_cap_gen;
		ttl = s->s_cap_ttl;
		spin_unlock(&s->s_cap_lock);

		if (di->lease_gen == gen &&
		    time_before(jiffies, dentry->d_time) &&
		    time_before(jiffies, ttl)) {
			valid = 1;
			if (di->lease_renew_after &&
			    time_after(jiffies, di->lease_renew_after)) {
				/* we should renew */
				dir = dentry->d_parent->d_inode;
				session = ceph_get_mds_session(s);
				seq = di->lease_seq;
				di->lease_renew_after = 0;
				di->lease_renew_from = jiffies;
			}
		}
	}
	spin_unlock(&dentry->d_lock);

	if (session) {
		ceph_mdsc_lease_send_msg(session, dir, dentry,
					 CEPH_MDS_LEASE_RENEW, seq);
		ceph_put_mds_session(session);
	}
	dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
	return valid;
}

/*
 * Check if directory-wide content lease/cap is valid.
 */
static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
{
	struct ceph_inode_info *ci = ceph_inode(dir);
	struct ceph_dentry_info *di = ceph_dentry(dentry);
	int valid = 0;

	spin_lock(&dir->i_lock);
	if (ci->i_shared_gen == di->lease_shared_gen)
		valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
	spin_unlock(&dir->i_lock);
	dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
	     dir, (unsigned)ci->i_shared_gen, dentry,
	     (unsigned)di->lease_shared_gen, valid);
	return valid;
}

/*
 * Check if cached dentry can be trusted.
 */
static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
1000 1001
	struct inode *dir;

1002
	if (nd && nd->flags & LOOKUP_RCU)
1003 1004 1005
		return -ECHILD;

	dir = dentry->d_parent->d_inode;
S
Sage Weil 已提交
1006

S
Sage Weil 已提交
1007 1008 1009
	dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
	     dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
	     ceph_dentry(dentry)->offset);
S
Sage Weil 已提交
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032

	/* always trust cached snapped dentries, snapdir dentry */
	if (ceph_snap(dir) != CEPH_NOSNAP) {
		dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
		     dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
		goto out_touch;
	}
	if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR)
		goto out_touch;

	if (dentry_lease_is_valid(dentry) ||
	    dir_lease_is_valid(dir, dentry))
		goto out_touch;

	dout("d_revalidate %p invalid\n", dentry);
	d_drop(dentry);
	return 0;
out_touch:
	ceph_dentry_lru_touch(dentry);
	return 1;
}

/*
1033
 * Release our ceph_dentry_info.
S
Sage Weil 已提交
1034
 */
1035
static void ceph_d_release(struct dentry *dentry)
S
Sage Weil 已提交
1036 1037 1038
{
	struct ceph_dentry_info *di = ceph_dentry(dentry);

1039
	dout("d_release %p\n", dentry);
S
Sage Weil 已提交
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
	if (di) {
		ceph_dentry_lru_del(dentry);
		if (di->lease_session)
			ceph_put_mds_session(di->lease_session);
		kmem_cache_free(ceph_dentry_cachep, di);
		dentry->d_fsdata = NULL;
	}
}

static int ceph_snapdir_d_revalidate(struct dentry *dentry,
					  struct nameidata *nd)
{
	/*
	 * Eventually, we'll want to revalidate snapped metadata
	 * too... probably...
	 */
	return 1;
}



/*
 * read() on a dir.  This weird interface hack only works if mounted
 * with '-o dirstat'.
 */
static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
			     loff_t *ppos)
{
	struct ceph_file_info *cf = file->private_data;
	struct inode *inode = file->f_dentry->d_inode;
	struct ceph_inode_info *ci = ceph_inode(inode);
	int left;
1072
	const int bufsize = 1024;
S
Sage Weil 已提交
1073

1074
	if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
S
Sage Weil 已提交
1075 1076 1077
		return -EISDIR;

	if (!cf->dir_info) {
1078
		cf->dir_info = kmalloc(bufsize, GFP_NOFS);
S
Sage Weil 已提交
1079 1080 1081
		if (!cf->dir_info)
			return -ENOMEM;
		cf->dir_info_len =
1082
			snprintf(cf->dir_info, bufsize,
S
Sage Weil 已提交
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
				"entries:   %20lld\n"
				" files:    %20lld\n"
				" subdirs:  %20lld\n"
				"rentries:  %20lld\n"
				" rfiles:   %20lld\n"
				" rsubdirs: %20lld\n"
				"rbytes:    %20lld\n"
				"rctime:    %10ld.%09ld\n",
				ci->i_files + ci->i_subdirs,
				ci->i_files,
				ci->i_subdirs,
				ci->i_rfiles + ci->i_rsubdirs,
				ci->i_rfiles,
				ci->i_rsubdirs,
				ci->i_rbytes,
				(long)ci->i_rctime.tv_sec,
				(long)ci->i_rctime.tv_nsec);
	}

	if (*ppos >= cf->dir_info_len)
		return 0;
	size = min_t(unsigned, size, cf->dir_info_len-*ppos);
	left = copy_to_user(buf, cf->dir_info + *ppos, size);
	if (left == size)
		return -EFAULT;
	*ppos += (size - left);
	return size - left;
}

/*
 * an fsync() on a dir will wait for any uncommitted directory
 * operations to commit.
 */
1116
static int ceph_dir_fsync(struct file *file, int datasync)
S
Sage Weil 已提交
1117
{
1118
	struct inode *inode = file->f_path.dentry->d_inode;
S
Sage Weil 已提交
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct list_head *head = &ci->i_unsafe_dirops;
	struct ceph_mds_request *req;
	u64 last_tid;
	int ret = 0;

	dout("dir_fsync %p\n", inode);
	spin_lock(&ci->i_unsafe_lock);
	if (list_empty(head))
		goto out;

	req = list_entry(head->prev,
			 struct ceph_mds_request, r_unsafe_dir_item);
	last_tid = req->r_tid;

	do {
		ceph_mdsc_get_request(req);
		spin_unlock(&ci->i_unsafe_lock);
		dout("dir_fsync %p wait on tid %llu (until %llu)\n",
		     inode, req->r_tid, last_tid);
		if (req->r_timeout) {
			ret = wait_for_completion_timeout(
				&req->r_safe_completion, req->r_timeout);
			if (ret > 0)
				ret = 0;
			else if (ret == 0)
				ret = -EIO;  /* timed out */
		} else {
			wait_for_completion(&req->r_safe_completion);
		}
		spin_lock(&ci->i_unsafe_lock);
		ceph_mdsc_put_request(req);

		if (ret || list_empty(head))
			break;
		req = list_entry(head->next,
				 struct ceph_mds_request, r_unsafe_dir_item);
	} while (req->r_tid < last_tid);
out:
	spin_unlock(&ci->i_unsafe_lock);
	return ret;
}

/*
 * We maintain a private dentry LRU.
 *
 * FIXME: this needs to be changed to a per-mds lru to be useful.
 */
void ceph_dentry_lru_add(struct dentry *dn)
{
	struct ceph_dentry_info *di = ceph_dentry(dn);
	struct ceph_mds_client *mdsc;

1172 1173
	dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
	     dn->d_name.len, dn->d_name.name);
S
Sage Weil 已提交
1174
	if (di) {
1175
		mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
S
Sage Weil 已提交
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
		spin_lock(&mdsc->dentry_lru_lock);
		list_add_tail(&di->lru, &mdsc->dentry_lru);
		mdsc->num_dentry++;
		spin_unlock(&mdsc->dentry_lru_lock);
	}
}

void ceph_dentry_lru_touch(struct dentry *dn)
{
	struct ceph_dentry_info *di = ceph_dentry(dn);
	struct ceph_mds_client *mdsc;

S
Sage Weil 已提交
1188 1189
	dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
	     dn->d_name.len, dn->d_name.name, di->offset);
S
Sage Weil 已提交
1190
	if (di) {
1191
		mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
S
Sage Weil 已提交
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
		spin_lock(&mdsc->dentry_lru_lock);
		list_move_tail(&di->lru, &mdsc->dentry_lru);
		spin_unlock(&mdsc->dentry_lru_lock);
	}
}

void ceph_dentry_lru_del(struct dentry *dn)
{
	struct ceph_dentry_info *di = ceph_dentry(dn);
	struct ceph_mds_client *mdsc;

1203 1204
	dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
	     dn->d_name.len, dn->d_name.name);
S
Sage Weil 已提交
1205
	if (di) {
1206
		mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
S
Sage Weil 已提交
1207 1208 1209 1210 1211 1212 1213
		spin_lock(&mdsc->dentry_lru_lock);
		list_del_init(&di->lru);
		mdsc->num_dentry--;
		spin_unlock(&mdsc->dentry_lru_lock);
	}
}

S
Sage Weil 已提交
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
/*
 * Return name hash for a given dentry.  This is dependent on
 * the parent directory's hash function.
 */
unsigned ceph_dentry_hash(struct dentry *dn)
{
	struct inode *dir = dn->d_parent->d_inode;
	struct ceph_inode_info *dci = ceph_inode(dir);

	switch (dci->i_dir_layout.dl_dir_hash) {
	case 0:	/* for backward compat */
	case CEPH_STR_HASH_LINUX:
		return dn->d_name.hash;

	default:
		return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
				     dn->d_name.name, dn->d_name.len);
	}
}

S
Sage Weil 已提交
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
const struct file_operations ceph_dir_fops = {
	.read = ceph_read_dir,
	.readdir = ceph_readdir,
	.llseek = ceph_dir_llseek,
	.open = ceph_open,
	.release = ceph_release,
	.unlocked_ioctl = ceph_ioctl,
	.fsync = ceph_dir_fsync,
};

const struct inode_operations ceph_dir_iops = {
	.lookup = ceph_lookup,
	.permission = ceph_permission,
	.getattr = ceph_getattr,
	.setattr = ceph_setattr,
	.setxattr = ceph_setxattr,
	.getxattr = ceph_getxattr,
	.listxattr = ceph_listxattr,
	.removexattr = ceph_removexattr,
	.mknod = ceph_mknod,
	.symlink = ceph_symlink,
	.mkdir = ceph_mkdir,
	.link = ceph_link,
	.unlink = ceph_unlink,
	.rmdir = ceph_unlink,
	.rename = ceph_rename,
	.create = ceph_create,
};

S
Sage Weil 已提交
1263
const struct dentry_operations ceph_dentry_ops = {
S
Sage Weil 已提交
1264
	.d_revalidate = ceph_d_revalidate,
1265
	.d_release = ceph_d_release,
S
Sage Weil 已提交
1266 1267
};

S
Sage Weil 已提交
1268
const struct dentry_operations ceph_snapdir_dentry_ops = {
S
Sage Weil 已提交
1269
	.d_revalidate = ceph_snapdir_d_revalidate,
1270
	.d_release = ceph_d_release,
S
Sage Weil 已提交
1271 1272
};

S
Sage Weil 已提交
1273
const struct dentry_operations ceph_snap_dentry_ops = {
1274
	.d_release = ceph_d_release,
S
Sage Weil 已提交
1275
};