addr.c 49.4 KB
Newer Older
1
#include <linux/ceph/ceph_debug.h>
S
Sage Weil 已提交
2 3 4 5 6 7

#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>	/* generic_writepages */
8
#include <linux/slab.h>
S
Sage Weil 已提交
9 10 11 12
#include <linux/pagevec.h>
#include <linux/task_io_accounting_ops.h>

#include "super.h"
13
#include "mds_client.h"
14
#include "cache.h"
15
#include <linux/ceph/osd_client.h>
S
Sage Weil 已提交
16 17 18 19 20 21 22 23 24 25 26 27

/*
 * Ceph address space ops.
 *
 * There are a few funny things going on here.
 *
 * The page->private field is used to reference a struct
 * ceph_snap_context for _every_ dirty page.  This indicates which
 * snapshot the page was logically dirtied in, and thus which snap
 * context needs to be associated with the osd write during writeback.
 *
 * Similarly, struct ceph_inode_info maintains a set of counters to
L
Lucas De Marchi 已提交
28
 * count dirty pages on the inode.  In the absence of snapshots,
S
Sage Weil 已提交
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
 *
 * When a snapshot is taken (that is, when the client receives
 * notification that a snapshot was taken), each inode with caps and
 * with dirty pages (dirty pages implies there is a cap) gets a new
 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
 * order, new snaps go to the tail).  The i_wrbuffer_ref_head count is
 * moved to capsnap->dirty. (Unless a sync write is currently in
 * progress.  In that case, the capsnap is said to be "pending", new
 * writes cannot start, and the capsnap isn't "finalized" until the
 * write completes (or fails) and a final size/mtime for the inode for
 * that snap can be settled upon.)  i_wrbuffer_ref_head is reset to 0.
 *
 * On writeback, we must submit writes to the osd IN SNAP ORDER.  So,
 * we look for the first capsnap in i_cap_snaps and write out pages in
 * that snap context _only_.  Then we move on to the next capsnap,
 * eventually reaching the "live" or "head" context (i.e., pages that
 * are not yet snapped) and are writing the most recently dirtied
 * pages.
 *
 * Invalidate and so forth must take care to ensure the dirty page
 * accounting is preserved.
 */

Y
Yehuda Sadeh 已提交
53 54 55 56 57
#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
#define CONGESTION_OFF_THRESH(congestion_kb)				\
	(CONGESTION_ON_THRESH(congestion_kb) -				\
	 (CONGESTION_ON_THRESH(congestion_kb) >> 2))

58 59 60 61 62 63
static inline struct ceph_snap_context *page_snap_context(struct page *page)
{
	if (PagePrivate(page))
		return (void *)page->private;
	return NULL;
}
S
Sage Weil 已提交
64 65 66 67 68 69 70 71 72 73 74

/*
 * Dirty a page.  Optimistically adjust accounting, on the assumption
 * that we won't race with invalidate.  If we do, readjust.
 */
static int ceph_set_page_dirty(struct page *page)
{
	struct address_space *mapping = page->mapping;
	struct inode *inode;
	struct ceph_inode_info *ci;
	struct ceph_snap_context *snapc;
75
	int ret;
S
Sage Weil 已提交
76 77 78 79

	if (unlikely(!mapping))
		return !TestSetPageDirty(page);

80
	if (PageDirty(page)) {
S
Sage Weil 已提交
81 82
		dout("%p set_page_dirty %p idx %lu -- already dirty\n",
		     mapping->host, page, page->index);
83
		BUG_ON(!PagePrivate(page));
S
Sage Weil 已提交
84 85 86 87 88 89 90
		return 0;
	}

	inode = mapping->host;
	ci = ceph_inode(inode);

	/* dirty the head */
91
	spin_lock(&ci->i_ceph_lock);
92 93 94 95 96 97 98 99 100 101 102 103 104
	BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
	if (__ceph_have_pending_cap_snap(ci)) {
		struct ceph_cap_snap *capsnap =
				list_last_entry(&ci->i_cap_snaps,
						struct ceph_cap_snap,
						ci_item);
		snapc = ceph_get_snap_context(capsnap->context);
		capsnap->dirty_pages++;
	} else {
		BUG_ON(!ci->i_head_snapc);
		snapc = ceph_get_snap_context(ci->i_head_snapc);
		++ci->i_wrbuffer_ref_head;
	}
S
Sage Weil 已提交
105
	if (ci->i_wrbuffer_ref == 0)
106
		ihold(inode);
S
Sage Weil 已提交
107 108 109 110 111 112 113
	++ci->i_wrbuffer_ref;
	dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
	     "snapc %p seq %lld (%d snaps)\n",
	     mapping->host, page, page->index,
	     ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
	     ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
	     snapc, snapc->seq, snapc->num_snaps);
114
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
115

116 117 118 119 120 121 122
	/*
	 * Reference snap context in page->private.  Also set
	 * PagePrivate so that we get invalidatepage callback.
	 */
	BUG_ON(PagePrivate(page));
	page->private = (unsigned long)snapc;
	SetPagePrivate(page);
S
Sage Weil 已提交
123

124 125 126
	ret = __set_page_dirty_nobuffers(page);
	WARN_ON(!PageLocked(page));
	WARN_ON(!page->mapping);
S
Sage Weil 已提交
127

128
	return ret;
S
Sage Weil 已提交
129 130 131 132 133 134 135
}

/*
 * If we are truncating the full page (i.e. offset == 0), adjust the
 * dirty page counters appropriately.  Only called if there is private
 * data on the page.
 */
136 137
static void ceph_invalidatepage(struct page *page, unsigned int offset,
				unsigned int length)
S
Sage Weil 已提交
138
{
139
	struct inode *inode;
S
Sage Weil 已提交
140
	struct ceph_inode_info *ci;
141
	struct ceph_snap_context *snapc = page_snap_context(page);
S
Sage Weil 已提交
142

143
	inode = page->mapping->host;
144 145
	ci = ceph_inode(inode);

146
	if (offset != 0 || length != PAGE_SIZE) {
147 148 149 150
		dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
		     inode, page, page->index, offset, length);
		return;
	}
151

152 153 154 155 156
	ceph_invalidate_fscache_page(inode, page);

	if (!PagePrivate(page))
		return;

S
Sage Weil 已提交
157 158 159 160 161 162 163 164
	/*
	 * We can get non-dirty pages here due to races between
	 * set_page_dirty and truncate_complete_page; just spit out a
	 * warning, in case we end up with accounting problems later.
	 */
	if (!PageDirty(page))
		pr_err("%p invalidatepage %p page not dirty\n", inode, page);

165
	ClearPageChecked(page);
S
Sage Weil 已提交
166

167 168 169 170 171 172 173
	dout("%p invalidatepage %p idx %lu full dirty page\n",
	     inode, page, page->index);

	ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
	ceph_put_snap_context(snapc);
	page->private = 0;
	ClearPagePrivate(page);
S
Sage Weil 已提交
174 175 176 177
}

static int ceph_releasepage(struct page *page, gfp_t g)
{
Y
Yan, Zheng 已提交
178 179
	dout("%p releasepage %p idx %lu\n", page->mapping->host,
	     page, page->index);
S
Sage Weil 已提交
180
	WARN_ON(PageDirty(page));
181 182 183 184 185 186

	/* Can we release the page from the cache? */
	if (!ceph_release_fscache_page(page, g))
		return 0;

	return !PagePrivate(page);
S
Sage Weil 已提交
187 188 189 190 191 192 193
}

/*
 * read a single page, without unlocking it.
 */
static int readpage_nounlock(struct file *filp, struct page *page)
{
A
Al Viro 已提交
194
	struct inode *inode = file_inode(filp);
S
Sage Weil 已提交
195
	struct ceph_inode_info *ci = ceph_inode(inode);
196
	struct ceph_osd_client *osdc =
197
		&ceph_inode_to_client(inode)->client->osdc;
S
Sage Weil 已提交
198
	int err = 0;
Y
Yan, Zheng 已提交
199
	u64 off = page_offset(page);
200
	u64 len = PAGE_SIZE;
S
Sage Weil 已提交
201

Y
Yan, Zheng 已提交
202
	if (off >= i_size_read(inode)) {
203
		zero_user_segment(page, 0, PAGE_SIZE);
Y
Yan, Zheng 已提交
204 205 206
		SetPageUptodate(page);
		return 0;
	}
207

208 209 210 211 212 213 214
	if (ci->i_inline_version != CEPH_INLINE_NONE) {
		/*
		 * Uptodate inline data should have been added
		 * into page cache while getting Fcr caps.
		 */
		if (off == 0)
			return -EINVAL;
215
		zero_user_segment(page, 0, PAGE_SIZE);
216 217 218
		SetPageUptodate(page);
		return 0;
	}
Y
Yan, Zheng 已提交
219 220

	err = ceph_readpage_from_fscache(inode, page);
221 222 223
	if (err == 0)
		goto out;

S
Sage Weil 已提交
224 225 226
	dout("readpage inode %p file %p page %p index %lu\n",
	     inode, filp, page, page->index);
	err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
Y
Yan, Zheng 已提交
227
				  off, &len,
S
Sage Weil 已提交
228
				  ci->i_truncate_seq, ci->i_truncate_size,
229
				  &page, 1, 0);
S
Sage Weil 已提交
230 231 232 233
	if (err == -ENOENT)
		err = 0;
	if (err < 0) {
		SetPageError(page);
234
		ceph_fscache_readpage_cancel(inode, page);
S
Sage Weil 已提交
235 236
		goto out;
	}
237
	if (err < PAGE_SIZE)
238
		/* zero fill remainder of page */
239
		zero_user_segment(page, err, PAGE_SIZE);
240 241
	else
		flush_dcache_page(page);
S
Sage Weil 已提交
242

243 244
	SetPageUptodate(page);
	ceph_readpage_to_fscache(inode, page);
245

S
Sage Weil 已提交
246 247 248 249 250 251 252 253 254 255 256 257
out:
	return err < 0 ? err : 0;
}

static int ceph_readpage(struct file *filp, struct page *page)
{
	int r = readpage_nounlock(filp, page);
	unlock_page(page);
	return r;
}

/*
S
Sage Weil 已提交
258
 * Finish an async read(ahead) op.
S
Sage Weil 已提交
259
 */
260
static void finish_read(struct ceph_osd_request *req)
S
Sage Weil 已提交
261
{
S
Sage Weil 已提交
262
	struct inode *inode = req->r_inode;
263
	struct ceph_osd_data *osd_data;
264 265
	int rc = req->r_result <= 0 ? req->r_result : 0;
	int bytes = req->r_result >= 0 ? req->r_result : 0;
266
	int num_pages;
S
Sage Weil 已提交
267
	int i;
S
Sage Weil 已提交
268

S
Sage Weil 已提交
269 270 271
	dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);

	/* unlock all pages, zeroing any data we didn't read */
272
	osd_data = osd_req_op_extent_osd_data(req, 0);
273 274 275
	BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
	num_pages = calc_pages_for((u64)osd_data->alignment,
					(u64)osd_data->length);
276
	for (i = 0; i < num_pages; i++) {
277
		struct page *page = osd_data->pages[i];
S
Sage Weil 已提交
278

279 280
		if (rc < 0 && rc != -ENOENT) {
			ceph_fscache_readpage_cancel(inode, page);
281
			goto unlock;
282
		}
283
		if (bytes < (int)PAGE_SIZE) {
S
Sage Weil 已提交
284 285
			/* zero (remainder of) page */
			int s = bytes < 0 ? 0 : bytes;
286
			zero_user_segment(page, s, PAGE_SIZE);
S
Sage Weil 已提交
287
		}
S
Sage Weil 已提交
288 289 290 291
 		dout("finish_read %p uptodate %p idx %lu\n", inode, page,
		     page->index);
		flush_dcache_page(page);
		SetPageUptodate(page);
292
		ceph_readpage_to_fscache(inode, page);
293
unlock:
S
Sage Weil 已提交
294
		unlock_page(page);
295 296
		put_page(page);
		bytes -= PAGE_SIZE;
S
Sage Weil 已提交
297
	}
298
	kfree(osd_data->pages);
S
Sage Weil 已提交
299 300
}

301 302 303 304 305 306 307 308
static void ceph_unlock_page_vector(struct page **pages, int num_pages)
{
	int i;

	for (i = 0; i < num_pages; i++)
		unlock_page(pages[i]);
}

S
Sage Weil 已提交
309
/*
S
Sage Weil 已提交
310 311
 * start an async read(ahead) operation.  return nr_pages we submitted
 * a read for on success, or negative error code.
S
Sage Weil 已提交
312
 */
313
static int start_read(struct inode *inode, struct list_head *page_list, int max)
S
Sage Weil 已提交
314
{
315 316
	struct ceph_osd_client *osdc =
		&ceph_inode_to_client(inode)->client->osdc;
S
Sage Weil 已提交
317 318
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct page *page = list_entry(page_list->prev, struct page, lru);
319
	struct ceph_vino vino;
S
Sage Weil 已提交
320 321
	struct ceph_osd_request *req;
	u64 off;
S
Sage Weil 已提交
322
	u64 len;
S
Sage Weil 已提交
323 324 325 326 327
	int i;
	struct page **pages;
	pgoff_t next_index;
	int nr_pages = 0;
	int ret;
S
Sage Weil 已提交
328

329
	off = (u64) page_offset(page);
S
Sage Weil 已提交
330

S
Sage Weil 已提交
331 332 333 334 335 336 337
	/* count pages */
	next_index = page->index;
	list_for_each_entry_reverse(page, page_list, lru) {
		if (page->index != next_index)
			break;
		nr_pages++;
		next_index++;
338 339
		if (max && nr_pages == max)
			break;
S
Sage Weil 已提交
340
	}
341
	len = nr_pages << PAGE_SHIFT;
S
Sage Weil 已提交
342 343
	dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
	     off, len);
344 345
	vino = ceph_vino(inode);
	req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
346
				    0, 1, CEPH_OSD_OP_READ,
347
				    CEPH_OSD_FLAG_READ, NULL,
S
Sage Weil 已提交
348
				    ci->i_truncate_seq, ci->i_truncate_size,
349
				    false);
350 351
	if (IS_ERR(req))
		return PTR_ERR(req);
S
Sage Weil 已提交
352

S
Sage Weil 已提交
353
	/* build page vector */
354
	nr_pages = calc_pages_for(0, len);
355
	pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL);
S
Sage Weil 已提交
356 357 358 359 360 361
	ret = -ENOMEM;
	if (!pages)
		goto out;
	for (i = 0; i < nr_pages; ++i) {
		page = list_entry(page_list->prev, struct page, lru);
		BUG_ON(PageLocked(page));
S
Sage Weil 已提交
362
		list_del(&page->lru);
363

S
Sage Weil 已提交
364 365 366
 		dout("start_read %p adding %p idx %lu\n", inode, page,
		     page->index);
		if (add_to_page_cache_lru(page, &inode->i_data, page->index,
367
					  GFP_KERNEL)) {
368
			ceph_fscache_uncache_page(inode, page);
369
			put_page(page);
S
Sage Weil 已提交
370
			dout("start_read %p add_to_page_cache failed %p\n",
S
Sage Weil 已提交
371
			     inode, page);
S
Sage Weil 已提交
372 373
			nr_pages = i;
			goto out_pages;
S
Sage Weil 已提交
374
		}
S
Sage Weil 已提交
375
		pages[i] = page;
S
Sage Weil 已提交
376
	}
377
	osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
S
Sage Weil 已提交
378 379 380 381 382 383 384 385 386 387 388
	req->r_callback = finish_read;
	req->r_inode = inode;

	dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
	ret = ceph_osdc_start_request(osdc, req, false);
	if (ret < 0)
		goto out_pages;
	ceph_osdc_put_request(req);
	return nr_pages;

out_pages:
389
	ceph_unlock_page_vector(pages, nr_pages);
S
Sage Weil 已提交
390 391 392 393 394
	ceph_release_page_vector(pages, nr_pages);
out:
	ceph_osdc_put_request(req);
	return ret;
}
S
Sage Weil 已提交
395

S
Sage Weil 已提交
396 397 398 399 400 401 402 403

/*
 * Read multiple pages.  Leave pages we don't read + unlock in page_list;
 * the caller (VM) cleans them up.
 */
static int ceph_readpages(struct file *file, struct address_space *mapping,
			  struct list_head *page_list, unsigned nr_pages)
{
A
Al Viro 已提交
404
	struct inode *inode = file_inode(file);
405
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
S
Sage Weil 已提交
406
	int rc = 0;
407 408
	int max = 0;

Y
Yan, Zheng 已提交
409 410 411
	if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
		return -EINVAL;

412 413 414 415 416 417
	rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
					 &nr_pages);

	if (rc == 0)
		goto out;

418 419
	if (fsc->mount_options->rsize >= PAGE_SIZE)
		max = (fsc->mount_options->rsize + PAGE_SIZE - 1)
420
			>> PAGE_SHIFT;
S
Sage Weil 已提交
421

422 423
	dout("readpages %p file %p nr_pages %d max %d\n", inode,
		file, nr_pages,
424
	     max);
S
Sage Weil 已提交
425
	while (!list_empty(page_list)) {
426
		rc = start_read(inode, page_list, max);
S
Sage Weil 已提交
427 428 429 430
		if (rc < 0)
			goto out;
		BUG_ON(rc == 0);
	}
S
Sage Weil 已提交
431
out:
432 433
	ceph_fscache_readpages_cancel(inode, page_list);

S
Sage Weil 已提交
434
	dout("readpages %p file %p ret %d\n", inode, file, rc);
S
Sage Weil 已提交
435 436 437 438 439 440 441
	return rc;
}

/*
 * Get ref for the oldest snapc for an inode with dirty data... that is, the
 * only snap context we are allowed to write back.
 */
442
static struct ceph_snap_context *get_oldest_context(struct inode *inode,
Y
Yan, Zheng 已提交
443
						    loff_t *snap_size)
S
Sage Weil 已提交
444 445 446 447 448
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_snap_context *snapc = NULL;
	struct ceph_cap_snap *capsnap = NULL;

449
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
450 451 452 453 454 455 456 457 458 459
	list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
		dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
		     capsnap->context, capsnap->dirty_pages);
		if (capsnap->dirty_pages) {
			snapc = ceph_get_snap_context(capsnap->context);
			if (snap_size)
				*snap_size = capsnap->size;
			break;
		}
	}
460
	if (!snapc && ci->i_wrbuffer_ref_head) {
461
		snapc = ceph_get_snap_context(ci->i_head_snapc);
S
Sage Weil 已提交
462 463 464
		dout(" head snapc %p has %d dirty pages\n",
		     snapc, ci->i_wrbuffer_ref_head);
	}
465
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
466 467 468 469 470 471 472 473 474 475 476 477 478
	return snapc;
}

/*
 * Write a single page, but leave the page locked.
 *
 * If we get a write error, set the page error bit, but still adjust the
 * dirty page accounting (i.e., page is no longer dirty).
 */
static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
{
	struct inode *inode;
	struct ceph_inode_info *ci;
479
	struct ceph_fs_client *fsc;
S
Sage Weil 已提交
480
	struct ceph_osd_client *osdc;
481
	struct ceph_snap_context *snapc, *oldest;
482
	loff_t page_off = page_offset(page);
Y
Yan, Zheng 已提交
483
	loff_t snap_size = -1;
Y
Yehuda Sadeh 已提交
484
	long writeback_stat;
Y
Yan, Zheng 已提交
485
	u64 truncate_size;
486
	u32 truncate_seq;
487
	int err = 0, len = PAGE_SIZE;
S
Sage Weil 已提交
488 489 490 491 492 493 494 495 496

	dout("writepage %p idx %lu\n", page, page->index);

	if (!page->mapping || !page->mapping->host) {
		dout("writepage %p - no mapping\n", page);
		return -EFAULT;
	}
	inode = page->mapping->host;
	ci = ceph_inode(inode);
497 498
	fsc = ceph_inode_to_client(inode);
	osdc = &fsc->client->osdc;
S
Sage Weil 已提交
499 500

	/* verify this is a writeable snap context */
501
	snapc = page_snap_context(page);
S
Sage Weil 已提交
502 503 504 505
	if (snapc == NULL) {
		dout("writepage %p page %p not dirty?\n", inode, page);
		goto out;
	}
506 507
	oldest = get_oldest_context(inode, &snap_size);
	if (snapc->seq > oldest->seq) {
S
Sage Weil 已提交
508
		dout("writepage %p page %p snapc %p not writeable - noop\n",
509
		     inode, page, snapc);
S
Sage Weil 已提交
510 511
		/* we should only noop if called by kswapd */
		WARN_ON((current->flags & PF_MEMALLOC) == 0);
512
		ceph_put_snap_context(oldest);
S
Sage Weil 已提交
513 514
		goto out;
	}
515
	ceph_put_snap_context(oldest);
S
Sage Weil 已提交
516

517 518 519
	spin_lock(&ci->i_ceph_lock);
	truncate_seq = ci->i_truncate_seq;
	truncate_size = ci->i_truncate_size;
Y
Yan, Zheng 已提交
520
	if (snap_size == -1)
521 522 523
		snap_size = i_size_read(inode);
	spin_unlock(&ci->i_ceph_lock);

S
Sage Weil 已提交
524
	/* is this a partial page at end of file? */
525 526 527 528 529 530
	if (page_off >= snap_size) {
		dout("%p page eof %llu\n", page, snap_size);
		goto out;
	}
	if (snap_size < page_off + len)
		len = snap_size - page_off;
S
Sage Weil 已提交
531

S
Sage Weil 已提交
532 533
	dout("writepage %p page %p index %lu on %llu~%u snapc %p\n",
	     inode, page, page->index, page_off, len, snapc);
S
Sage Weil 已提交
534

535
	writeback_stat = atomic_long_inc_return(&fsc->writeback_count);
Y
Yehuda Sadeh 已提交
536
	if (writeback_stat >
537 538
	    CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
		set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC);
Y
Yehuda Sadeh 已提交
539

S
Sage Weil 已提交
540 541 542 543
	set_page_writeback(page);
	err = ceph_osdc_writepages(osdc, ceph_vino(inode),
				   &ci->i_layout, snapc,
				   page_off, len,
544
				   truncate_seq, truncate_size,
545
				   &inode->i_mtime, &page, 1);
S
Sage Weil 已提交
546
	if (err < 0) {
547 548 549 550 551 552 553 554 555 556 557 558
		struct writeback_control tmp_wbc;
		if (!wbc)
			wbc = &tmp_wbc;
		if (err == -ERESTARTSYS) {
			/* killed by SIGKILL */
			dout("writepage interrupted page %p\n", page);
			redirty_page_for_writepage(wbc, page);
			end_page_writeback(page);
			goto out;
		}
		dout("writepage setting page/mapping error %d %p\n",
		     err, page);
S
Sage Weil 已提交
559 560
		SetPageError(page);
		mapping_set_error(&inode->i_data, err);
561
		wbc->pages_skipped++;
S
Sage Weil 已提交
562 563 564 565 566 567 568 569
	} else {
		dout("writepage cleaned page %p\n", page);
		err = 0;  /* vfs expects us to return 0 */
	}
	page->private = 0;
	ClearPagePrivate(page);
	end_page_writeback(page);
	ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
570
	ceph_put_snap_context(snapc);  /* page's reference */
S
Sage Weil 已提交
571 572 573 574 575 576
out:
	return err;
}

static int ceph_writepage(struct page *page, struct writeback_control *wbc)
{
577 578 579
	int err;
	struct inode *inode = page->mapping->host;
	BUG_ON(!inode);
580
	ihold(inode);
581
	err = writepage_nounlock(page, wbc);
582 583 584 585 586
	if (err == -ERESTARTSYS) {
		/* direct memory reclaimer was killed by SIGKILL. return 0
		 * to prevent caller from setting mapping/page error */
		err = 0;
	}
S
Sage Weil 已提交
587
	unlock_page(page);
588
	iput(inode);
S
Sage Weil 已提交
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614
	return err;
}

/*
 * lame release_pages helper.  release_pages() isn't exported to
 * modules.
 */
static void ceph_release_pages(struct page **pages, int num)
{
	struct pagevec pvec;
	int i;

	pagevec_init(&pvec, 0);
	for (i = 0; i < num; i++) {
		if (pagevec_add(&pvec, pages[i]) == 0)
			pagevec_release(&pvec);
	}
	pagevec_release(&pvec);
}

/*
 * async writeback completion handler.
 *
 * If we get an error, set the mapping error bit, but not the individual
 * page error bits.
 */
615
static void writepages_finish(struct ceph_osd_request *req)
S
Sage Weil 已提交
616 617 618
{
	struct inode *inode = req->r_inode;
	struct ceph_inode_info *ci = ceph_inode(inode);
619
	struct ceph_osd_data *osd_data;
S
Sage Weil 已提交
620
	struct page *page;
Y
Yan, Zheng 已提交
621 622 623
	int num_pages, total_pages = 0;
	int i, j;
	int rc = req->r_result;
S
Sage Weil 已提交
624 625
	struct ceph_snap_context *snapc = req->r_snapc;
	struct address_space *mapping = inode->i_mapping;
626
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
Y
Yan, Zheng 已提交
627
	bool remove_page;
S
Sage Weil 已提交
628

Y
Yan, Zheng 已提交
629 630
	dout("writepages_finish %p rc %d\n", inode, rc);
	if (rc < 0)
S
Sage Weil 已提交
631
		mapping_set_error(mapping, rc);
Y
Yan, Zheng 已提交
632 633 634 635 636 637 638 639 640

	/*
	 * We lost the cache cap, need to truncate the page before
	 * it is unlocked, otherwise we'd truncate it later in the
	 * page truncation thread, possibly losing some data that
	 * raced its way in
	 */
	remove_page = !(ceph_caps_issued(ci) &
			(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
S
Sage Weil 已提交
641 642

	/* clean all pages */
Y
Yan, Zheng 已提交
643 644 645
	for (i = 0; i < req->r_num_ops; i++) {
		if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
			break;
646

Y
Yan, Zheng 已提交
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662
		osd_data = osd_req_op_extent_osd_data(req, i);
		BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
		num_pages = calc_pages_for((u64)osd_data->alignment,
					   (u64)osd_data->length);
		total_pages += num_pages;
		for (j = 0; j < num_pages; j++) {
			page = osd_data->pages[j];
			BUG_ON(!page);
			WARN_ON(!PageUptodate(page));

			if (atomic_long_dec_return(&fsc->writeback_count) <
			     CONGESTION_OFF_THRESH(
					fsc->mount_options->congestion_kb))
				clear_bdi_congested(&fsc->backing_dev_info,
						    BLK_RW_ASYNC);

663 664 665
			if (rc < 0)
				SetPageError(page);

Y
Yan, Zheng 已提交
666 667 668 669 670 671 672 673 674 675 676 677 678 679
			ceph_put_snap_context(page_snap_context(page));
			page->private = 0;
			ClearPagePrivate(page);
			dout("unlocking %p\n", page);
			end_page_writeback(page);

			if (remove_page)
				generic_error_remove_page(inode->i_mapping,
							  page);

			unlock_page(page);
		}
		dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
		     inode, osd_data->length, rc >= 0 ? num_pages : 0);
680

Y
Yan, Zheng 已提交
681
		ceph_release_pages(osd_data->pages, num_pages);
S
Sage Weil 已提交
682 683
	}

Y
Yan, Zheng 已提交
684 685 686
	ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);

	osd_data = osd_req_op_extent_osd_data(req, 0);
687 688
	if (osd_data->pages_from_pool)
		mempool_free(osd_data->pages,
689
			     ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
S
Sage Weil 已提交
690
	else
691
		kfree(osd_data->pages);
S
Sage Weil 已提交
692 693 694 695 696 697 698 699 700 701 702
	ceph_osdc_put_request(req);
}

/*
 * initiate async writeback
 */
static int ceph_writepages_start(struct address_space *mapping,
				 struct writeback_control *wbc)
{
	struct inode *inode = mapping->host;
	struct ceph_inode_info *ci = ceph_inode(inode);
703 704
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_vino vino = ceph_vino(inode);
S
Sage Weil 已提交
705 706 707 708
	pgoff_t index, start, end;
	int range_whole = 0;
	int should_loop = 1;
	pgoff_t max_pages = 0, max_pages_ever = 0;
709
	struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
S
Sage Weil 已提交
710 711 712 713 714
	struct pagevec pvec;
	int done = 0;
	int rc = 0;
	unsigned wsize = 1 << inode->i_blkbits;
	struct ceph_osd_request *req = NULL;
D
Dan Carpenter 已提交
715
	int do_sync = 0;
Y
Yan, Zheng 已提交
716 717
	loff_t snap_size, i_size;
	u64 truncate_size;
718
	u32 truncate_seq;
S
Sage Weil 已提交
719 720 721 722 723 724

	/*
	 * Include a 'sync' in the OSD request if this is a data
	 * integrity write (e.g., O_SYNC write or fsync()), or if our
	 * cap is being revoked.
	 */
725 726
	if ((wbc->sync_mode == WB_SYNC_ALL) ||
		ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER))
S
Sage Weil 已提交
727 728 729 730 731 732
		do_sync = 1;
	dout("writepages_start %p dosync=%d (mode=%s)\n",
	     inode, do_sync,
	     wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
	     (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));

733
	if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
734 735 736 737 738
		if (ci->i_wrbuffer_ref > 0) {
			pr_warn_ratelimited(
				"writepage_start %p %lld forced umount\n",
				inode, ceph_ino(inode));
		}
739
		mapping_set_error(mapping, -EIO);
S
Sage Weil 已提交
740 741
		return -EIO; /* we're in a forced umount, don't write! */
	}
742 743
	if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize)
		wsize = fsc->mount_options->wsize;
744 745 746
	if (wsize < PAGE_SIZE)
		wsize = PAGE_SIZE;
	max_pages_ever = wsize >> PAGE_SHIFT;
S
Sage Weil 已提交
747 748 749 750 751 752 753 754 755

	pagevec_init(&pvec, 0);

	/* where to start/end? */
	if (wbc->range_cyclic) {
		start = mapping->writeback_index; /* Start from prev offset */
		end = -1;
		dout(" cyclic, start at %lu\n", start);
	} else {
756 757
		start = wbc->range_start >> PAGE_SHIFT;
		end = wbc->range_end >> PAGE_SHIFT;
S
Sage Weil 已提交
758 759 760 761 762 763 764 765 766 767
		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
			range_whole = 1;
		should_loop = 0;
		dout(" not cyclic, %lu to %lu\n", start, end);
	}
	index = start;

retry:
	/* find oldest snap context with dirty data */
	ceph_put_snap_context(snapc);
Y
Yan, Zheng 已提交
768
	snap_size = -1;
S
Sage Weil 已提交
769 770 771 772 773 774 775 776 777
	snapc = get_oldest_context(inode, &snap_size);
	if (!snapc) {
		/* hmm, why does writepages get called when there
		   is no dirty data? */
		dout(" no snap context with dirty data?\n");
		goto out;
	}
	dout(" oldest snapc is %p seq %lld (%d snaps)\n",
	     snapc, snapc->seq, snapc->num_snaps);
778 779 780 781

	spin_lock(&ci->i_ceph_lock);
	truncate_seq = ci->i_truncate_seq;
	truncate_size = ci->i_truncate_size;
Y
Yan, Zheng 已提交
782
	i_size = i_size_read(inode);
783 784
	spin_unlock(&ci->i_ceph_lock);

S
Sage Weil 已提交
785 786 787 788 789 790 791 792 793 794 795 796
	if (last_snapc && snapc != last_snapc) {
		/* if we switched to a newer snapc, restart our scan at the
		 * start of the original file range. */
		dout("  snapc differs from last pass, restarting at %lu\n",
		     index);
		index = start;
	}
	last_snapc = snapc;

	while (!done && index <= end) {
		unsigned i;
		int first;
Y
Yan, Zheng 已提交
797 798 799 800
		pgoff_t strip_unit_end = 0;
		int num_ops = 0, op_idx;
		int pvec_pages, locked_pages = 0;
		struct page **pages = NULL, **data_pages;
801
		mempool_t *pool = NULL;	/* Becomes non-null if mempool used */
S
Sage Weil 已提交
802 803
		struct page *page;
		int want;
Y
Yan, Zheng 已提交
804
		u64 offset = 0, len = 0;
S
Sage Weil 已提交
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840

		max_pages = max_pages_ever;

get_more_pages:
		first = -1;
		want = min(end - index,
			   min((pgoff_t)PAGEVEC_SIZE,
			       max_pages - (pgoff_t)locked_pages) - 1)
			+ 1;
		pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index,
						PAGECACHE_TAG_DIRTY,
						want);
		dout("pagevec_lookup_tag got %d\n", pvec_pages);
		if (!pvec_pages && !locked_pages)
			break;
		for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
			page = pvec.pages[i];
			dout("? %p idx %lu\n", page, page->index);
			if (locked_pages == 0)
				lock_page(page);  /* first page */
			else if (!trylock_page(page))
				break;

			/* only dirty pages, or our accounting breaks */
			if (unlikely(!PageDirty(page)) ||
			    unlikely(page->mapping != mapping)) {
				dout("!dirty or !mapping %p\n", page);
				unlock_page(page);
				break;
			}
			if (!wbc->range_cyclic && page->index > end) {
				dout("end of range %p\n", page);
				done = 1;
				unlock_page(page);
				break;
			}
Y
Yan, Zheng 已提交
841 842
			if (strip_unit_end && (page->index > strip_unit_end)) {
				dout("end of strip unit %p\n", page);
S
Sage Weil 已提交
843 844 845 846 847 848 849
				unlock_page(page);
				break;
			}
			if (wbc->sync_mode != WB_SYNC_NONE) {
				dout("waiting on writeback %p\n", page);
				wait_on_page_writeback(page);
			}
Y
Yan, Zheng 已提交
850 851 852 853
			if (page_offset(page) >=
			    (snap_size == -1 ? i_size : snap_size)) {
				dout("%p page eof %llu\n", page,
				     (snap_size == -1 ? i_size : snap_size));
S
Sage Weil 已提交
854 855 856 857 858 859 860 861 862 863 864
				done = 1;
				unlock_page(page);
				break;
			}
			if (PageWriteback(page)) {
				dout("%p under writeback\n", page);
				unlock_page(page);
				break;
			}

			/* only if matching snap context */
865
			pgsnapc = page_snap_context(page);
866 867 868
			if (pgsnapc->seq > snapc->seq) {
				dout("page snapc %p %lld > oldest %p %lld\n",
				     pgsnapc, pgsnapc->seq, snapc, snapc->seq);
S
Sage Weil 已提交
869 870 871 872 873 874 875 876 877 878 879 880
				unlock_page(page);
				if (!locked_pages)
					continue; /* keep looking for snap */
				break;
			}

			if (!clear_page_dirty_for_io(page)) {
				dout("%p !clear_page_dirty_for_io\n", page);
				unlock_page(page);
				break;
			}

881 882 883
			/*
			 * We have something to write.  If this is
			 * the first locked page this time through,
Y
Yan, Zheng 已提交
884 885
			 * calculate max possinle write size and
			 * allocate a page array
886
			 */
S
Sage Weil 已提交
887
			if (locked_pages == 0) {
Y
Yan, Zheng 已提交
888 889 890
				u64 objnum;
				u64 objoff;

S
Sage Weil 已提交
891
				/* prepare async write request */
892
				offset = (u64)page_offset(page);
S
Sage Weil 已提交
893
				len = wsize;
Y
Yan, Zheng 已提交
894 895 896 897 898 899

				rc = ceph_calc_file_object_mapping(&ci->i_layout,
								offset, len,
								&objnum, &objoff,
								&len);
				if (rc < 0) {
900 901 902 903
					unlock_page(page);
					break;
				}

Y
Yan, Zheng 已提交
904 905
				num_ops = 1 + do_sync;
				strip_unit_end = page->index +
906
					((len - 1) >> PAGE_SHIFT);
A
Alex Elder 已提交
907

Y
Yan, Zheng 已提交
908
				BUG_ON(pages);
A
Alex Elder 已提交
909
				max_pages = calc_pages_for(0, (u64)len);
910 911
				pages = kmalloc(max_pages * sizeof (*pages),
						GFP_NOFS);
A
Alex Elder 已提交
912 913 914
				if (!pages) {
					pool = fsc->wb_pagevec_pool;
					pages = mempool_alloc(pool, GFP_NOFS);
915
					BUG_ON(!pages);
A
Alex Elder 已提交
916
				}
Y
Yan, Zheng 已提交
917 918 919

				len = 0;
			} else if (page->index !=
920
				   (offset + len) >> PAGE_SHIFT) {
Y
Yan, Zheng 已提交
921 922 923 924 925 926 927 928 929 930
				if (num_ops >= (pool ?  CEPH_OSD_SLAB_OPS :
							CEPH_OSD_MAX_OPS)) {
					redirty_page_for_writepage(wbc, page);
					unlock_page(page);
					break;
				}

				num_ops++;
				offset = (u64)page_offset(page);
				len = 0;
S
Sage Weil 已提交
931 932 933 934 935 936 937
			}

			/* note position of first page in pvec */
			if (first < 0)
				first = i;
			dout("%p will write page %p idx %lu\n",
			     inode, page, page->index);
Y
Yehuda Sadeh 已提交
938

Y
Yan, Zheng 已提交
939 940
			if (atomic_long_inc_return(&fsc->writeback_count) >
			    CONGESTION_ON_THRESH(
941 942
				    fsc->mount_options->congestion_kb)) {
				set_bdi_congested(&fsc->backing_dev_info,
S
Sage Weil 已提交
943
						  BLK_RW_ASYNC);
Y
Yehuda Sadeh 已提交
944 945
			}

946
			pages[locked_pages] = page;
S
Sage Weil 已提交
947
			locked_pages++;
948
			len += PAGE_SIZE;
S
Sage Weil 已提交
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
		}

		/* did we get anything? */
		if (!locked_pages)
			goto release_pvec_pages;
		if (i) {
			int j;
			BUG_ON(!locked_pages || first < 0);

			if (pvec_pages && i == pvec_pages &&
			    locked_pages < max_pages) {
				dout("reached end pvec, trying for more\n");
				pagevec_reinit(&pvec);
				goto get_more_pages;
			}

			/* shift unused pages over in the pvec...  we
			 * will need to release them below. */
			for (j = i; j < pvec_pages; j++) {
Y
Yan, Zheng 已提交
968
				dout(" pvec leftover page %p\n", pvec.pages[j]);
S
Sage Weil 已提交
969 970 971 972 973
				pvec.pages[j-i+first] = pvec.pages[j];
			}
			pvec.nr -= i-first;
		}

Y
Yan, Zheng 已提交
974
new_request:
975
		offset = page_offset(pages[0]);
Y
Yan, Zheng 已提交
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997
		len = wsize;

		req = ceph_osdc_new_request(&fsc->client->osdc,
					&ci->i_layout, vino,
					offset, &len, 0, num_ops,
					CEPH_OSD_OP_WRITE,
					CEPH_OSD_FLAG_WRITE |
					CEPH_OSD_FLAG_ONDISK,
					snapc, truncate_seq,
					truncate_size, false);
		if (IS_ERR(req)) {
			req = ceph_osdc_new_request(&fsc->client->osdc,
						&ci->i_layout, vino,
						offset, &len, 0,
						min(num_ops,
						    CEPH_OSD_SLAB_OPS),
						CEPH_OSD_OP_WRITE,
						CEPH_OSD_FLAG_WRITE |
						CEPH_OSD_FLAG_ONDISK,
						snapc, truncate_seq,
						truncate_size, true);
			BUG_ON(IS_ERR(req));
Y
Yan, Zheng 已提交
998
		}
Y
Yan, Zheng 已提交
999
		BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1000
			     PAGE_SIZE - offset);
Y
Yan, Zheng 已提交
1001 1002 1003

		req->r_callback = writepages_finish;
		req->r_inode = inode;
S
Sage Weil 已提交
1004

Y
Yan, Zheng 已提交
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
		/* Format the osd request message and submit the write */
		len = 0;
		data_pages = pages;
		op_idx = 0;
		for (i = 0; i < locked_pages; i++) {
			u64 cur_offset = page_offset(pages[i]);
			if (offset + len != cur_offset) {
				if (op_idx + do_sync + 1 == req->r_num_ops)
					break;
				osd_req_op_extent_dup_last(req, op_idx,
							   cur_offset - offset);
				dout("writepages got pages at %llu~%llu\n",
				     offset, len);
				osd_req_op_extent_osd_data_pages(req, op_idx,
							data_pages, len, 0,
1020
							!!pool, false);
Y
Yan, Zheng 已提交
1021
				osd_req_op_extent_update(req, op_idx, len);
1022

Y
Yan, Zheng 已提交
1023 1024 1025 1026 1027 1028 1029
				len = 0;
				offset = cur_offset; 
				data_pages = pages + i;
				op_idx++;
			}

			set_page_writeback(pages[i]);
1030
			len += PAGE_SIZE;
Y
Yan, Zheng 已提交
1031 1032 1033 1034 1035 1036 1037 1038
		}

		if (snap_size != -1) {
			len = min(len, snap_size - offset);
		} else if (i == locked_pages) {
			/* writepages_finish() clears writeback pages
			 * according to the data length, so make sure
			 * data length covers all locked pages */
1039
			u64 min_len = len + 1 - PAGE_SIZE;
Y
Yan, Zheng 已提交
1040 1041 1042 1043
			len = min(len, (u64)i_size_read(inode) - offset);
			len = max(len, min_len);
		}
		dout("writepages got pages at %llu~%llu\n", offset, len);
1044

Y
Yan, Zheng 已提交
1045 1046 1047
		osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
						 0, !!pool, false);
		osd_req_op_extent_update(req, op_idx, len);
1048

Y
Yan, Zheng 已提交
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
		if (do_sync) {
			op_idx++;
			osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0);
		}
		BUG_ON(op_idx + 1 != req->r_num_ops);

		pool = NULL;
		if (i < locked_pages) {
			BUG_ON(num_ops <= req->r_num_ops);
			num_ops -= req->r_num_ops;
			num_ops += do_sync;
			locked_pages -= i;

			/* allocate new pages array for next request */
			data_pages = pages;
			pages = kmalloc(locked_pages * sizeof (*pages),
					GFP_NOFS);
			if (!pages) {
				pool = fsc->wb_pagevec_pool;
				pages = mempool_alloc(pool, GFP_NOFS);
				BUG_ON(!pages);
			}
			memcpy(pages, data_pages + i,
			       locked_pages * sizeof(*pages));
			memset(data_pages + i, 0,
			       locked_pages * sizeof(*pages));
		} else {
			BUG_ON(num_ops != req->r_num_ops);
			index = pages[i - 1]->index + 1;
			/* request message now owns the pages array */
			pages = NULL;
		}
1081

1082
		req->r_mtime = inode->i_mtime;
1083 1084
		rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
		BUG_ON(rc);
S
Sage Weil 已提交
1085 1086
		req = NULL;

Y
Yan, Zheng 已提交
1087 1088 1089 1090
		wbc->nr_to_write -= i;
		if (pages)
			goto new_request;

S
Sage Weil 已提交
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
		if (wbc->nr_to_write <= 0)
			done = 1;

release_pvec_pages:
		dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
		     pvec.nr ? pvec.pages[0] : NULL);
		pagevec_release(&pvec);

		if (locked_pages && !done)
			goto retry;
	}

	if (should_loop && !done) {
		/* more to do; loop back to beginning of file */
		dout("writepages looping back to beginning of file\n");
		should_loop = 0;
		index = 0;
		goto retry;
	}

	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = index;

out:
1115
	ceph_osdc_put_request(req);
S
Sage Weil 已提交
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
	ceph_put_snap_context(snapc);
	dout("writepages done, rc = %d\n", rc);
	return rc;
}



/*
 * See if a given @snapc is either writeable, or already written.
 */
static int context_is_writeable_or_written(struct inode *inode,
					   struct ceph_snap_context *snapc)
{
	struct ceph_snap_context *oldest = get_oldest_context(inode, NULL);
1130 1131 1132 1133
	int ret = !oldest || snapc->seq <= oldest->seq;

	ceph_put_snap_context(oldest);
	return ret;
S
Sage Weil 已提交
1134 1135 1136 1137 1138
}

/*
 * We are only allowed to write into/dirty the page if the page is
 * clean, or already dirty within the same snap context.
1139 1140 1141 1142
 *
 * called with page locked.
 * return success with page locked,
 * or any failure (incl -EAGAIN) with page unlocked.
S
Sage Weil 已提交
1143
 */
1144 1145 1146
static int ceph_update_writeable_page(struct file *file,
			    loff_t pos, unsigned len,
			    struct page *page)
S
Sage Weil 已提交
1147
{
A
Al Viro 已提交
1148
	struct inode *inode = file_inode(file);
1149
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
S
Sage Weil 已提交
1150
	struct ceph_inode_info *ci = ceph_inode(inode);
1151 1152
	loff_t page_off = pos & PAGE_MASK;
	int pos_in_page = pos & ~PAGE_MASK;
S
Sage Weil 已提交
1153 1154 1155
	int end_in_page = pos_in_page + len;
	loff_t i_size;
	int r;
1156
	struct ceph_snap_context *snapc, *oldest;
S
Sage Weil 已提交
1157

1158 1159 1160 1161 1162 1163
	if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
		dout(" page %p forced umount\n", page);
		unlock_page(page);
		return -EIO;
	}

S
Sage Weil 已提交
1164 1165 1166 1167
retry_locked:
	/* writepages currently holds page lock, but if we change that later, */
	wait_on_page_writeback(page);

1168
	snapc = page_snap_context(page);
1169
	if (snapc && snapc != ci->i_head_snapc) {
S
Sage Weil 已提交
1170 1171 1172 1173
		/*
		 * this page is already dirty in another (older) snap
		 * context!  is it writeable now?
		 */
1174
		oldest = get_oldest_context(inode, NULL);
S
Sage Weil 已提交
1175

1176
		if (snapc->seq > oldest->seq) {
1177
			ceph_put_snap_context(oldest);
S
Sage Weil 已提交
1178
			dout(" page %p snapc %p not current or oldest\n",
1179
			     page, snapc);
S
Sage Weil 已提交
1180 1181 1182 1183
			/*
			 * queue for writeback, and wait for snapc to
			 * be writeable or written
			 */
1184
			snapc = ceph_get_snap_context(snapc);
S
Sage Weil 已提交
1185
			unlock_page(page);
1186
			ceph_queue_writeback(inode);
1187
			r = wait_event_killable(ci->i_cap_wq,
S
Sage Weil 已提交
1188 1189
			       context_is_writeable_or_written(inode, snapc));
			ceph_put_snap_context(snapc);
1190 1191
			if (r == -ERESTARTSYS)
				return r;
1192
			return -EAGAIN;
S
Sage Weil 已提交
1193
		}
1194
		ceph_put_snap_context(oldest);
S
Sage Weil 已提交
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212

		/* yay, writeable, do it now (without dropping page lock) */
		dout(" page %p snapc %p not current, but oldest\n",
		     page, snapc);
		if (!clear_page_dirty_for_io(page))
			goto retry_locked;
		r = writepage_nounlock(page, NULL);
		if (r < 0)
			goto fail_nosnap;
		goto retry_locked;
	}

	if (PageUptodate(page)) {
		dout(" page %p already uptodate\n", page);
		return 0;
	}

	/* full page? */
1213
	if (pos_in_page == 0 && len == PAGE_SIZE)
S
Sage Weil 已提交
1214 1215 1216
		return 0;

	/* past end of file? */
1217
	i_size = i_size_read(inode);
S
Sage Weil 已提交
1218 1219 1220

	if (page_off >= i_size ||
	    (pos_in_page == 0 && (pos+len) >= i_size &&
1221
	     end_in_page - pos_in_page != PAGE_SIZE)) {
S
Sage Weil 已提交
1222
		dout(" zeroing %p 0 - %d and %d - %d\n",
1223
		     page, pos_in_page, end_in_page, (int)PAGE_SIZE);
S
Sage Weil 已提交
1224 1225
		zero_user_segments(page,
				   0, pos_in_page,
1226
				   end_in_page, PAGE_SIZE);
S
Sage Weil 已提交
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
		return 0;
	}

	/* we need to read it. */
	r = readpage_nounlock(file, page);
	if (r < 0)
		goto fail_nosnap;
	goto retry_locked;
fail_nosnap:
	unlock_page(page);
	return r;
}

1240 1241 1242 1243 1244 1245 1246 1247
/*
 * We are only allowed to write into/dirty the page if the page is
 * clean, or already dirty within the same snap context.
 */
static int ceph_write_begin(struct file *file, struct address_space *mapping,
			    loff_t pos, unsigned len, unsigned flags,
			    struct page **pagep, void **fsdata)
{
A
Al Viro 已提交
1248
	struct inode *inode = file_inode(file);
1249
	struct page *page;
1250
	pgoff_t index = pos >> PAGE_SHIFT;
S
Sage Weil 已提交
1251
	int r;
1252 1253

	do {
1254
		/* get a page */
1255
		page = grab_cache_page_write_begin(mapping, index, 0);
S
Sage Weil 已提交
1256 1257
		if (!page)
			return -ENOMEM;
1258 1259

		dout("write_begin file %p inode %p page %p %d~%d\n", file,
S
Sage Weil 已提交
1260
		     inode, page, (int)pos, (int)len);
1261 1262

		r = ceph_update_writeable_page(file, pos, len, page);
1263
		if (r < 0)
1264
			put_page(page);
1265 1266
		else
			*pagep = page;
1267 1268 1269 1270 1271
	} while (r == -EAGAIN);

	return r;
}

S
Sage Weil 已提交
1272 1273
/*
 * we don't do anything in here that simple_write_end doesn't do
1274
 * except adjust dirty page accounting
S
Sage Weil 已提交
1275 1276 1277 1278 1279
 */
static int ceph_write_end(struct file *file, struct address_space *mapping,
			  loff_t pos, unsigned len, unsigned copied,
			  struct page *page, void *fsdata)
{
A
Al Viro 已提交
1280
	struct inode *inode = file_inode(file);
1281
	unsigned from = pos & (PAGE_SIZE - 1);
S
Sage Weil 已提交
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
	int check_cap = 0;

	dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
	     inode, page, (int)pos, (int)copied, (int)len);

	/* zero the stale part of the page if we did a short copy */
	if (copied < len)
		zero_user_segment(page, from+copied, len);

	/* did file size increase? */
1292
	if (pos+copied > i_size_read(inode))
S
Sage Weil 已提交
1293 1294 1295 1296 1297 1298 1299 1300
		check_cap = ceph_inode_set_size(inode, pos+copied);

	if (!PageUptodate(page))
		SetPageUptodate(page);

	set_page_dirty(page);

	unlock_page(page);
1301
	put_page(page);
S
Sage Weil 已提交
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313

	if (check_cap)
		ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);

	return copied;
}

/*
 * we set .direct_IO to indicate direct io is supported, but since we
 * intercept O_DIRECT reads and writes early, this function should
 * never get called.
 */
1314
static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
S
Sage Weil 已提交
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
{
	WARN_ON(1);
	return -EINVAL;
}

const struct address_space_operations ceph_aops = {
	.readpage = ceph_readpage,
	.readpages = ceph_readpages,
	.writepage = ceph_writepage,
	.writepages = ceph_writepages_start,
	.write_begin = ceph_write_begin,
	.write_end = ceph_write_end,
	.set_page_dirty = ceph_set_page_dirty,
	.invalidatepage = ceph_invalidatepage,
	.releasepage = ceph_releasepage,
	.direct_IO = ceph_direct_io,
};

1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
static void ceph_block_sigs(sigset_t *oldset)
{
	sigset_t mask;
	siginitsetinv(&mask, sigmask(SIGKILL));
	sigprocmask(SIG_BLOCK, &mask, oldset);
}

static void ceph_restore_sigs(sigset_t *oldset)
{
	sigprocmask(SIG_SETMASK, oldset, NULL);
}
S
Sage Weil 已提交
1344 1345 1346 1347

/*
 * vm ops
 */
1348 1349 1350 1351 1352
static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct inode *inode = file_inode(vma->vm_file);
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_file_info *fi = vma->vm_file->private_data;
1353
	struct page *pinned_page = NULL;
1354
	loff_t off = vmf->pgoff << PAGE_SHIFT;
1355
	int want, got, ret;
1356 1357 1358
	sigset_t oldset;

	ceph_block_sigs(&oldset);
1359 1360

	dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1361
	     inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
1362 1363 1364 1365
	if (fi->fmode & CEPH_FILE_MODE_LAZY)
		want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
	else
		want = CEPH_CAP_FILE_CACHE;
1366 1367 1368

	got = 0;
	ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1369
	if (ret < 0)
1370
		goto out_restore;
1371

1372
	dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1373
	     inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
1374

Y
Yan, Zheng 已提交
1375 1376 1377 1378 1379
	if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
	    ci->i_inline_version == CEPH_INLINE_NONE)
		ret = filemap_fault(vma, vmf);
	else
		ret = -EAGAIN;
1380 1381

	dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1382
	     inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret);
1383
	if (pinned_page)
1384
		put_page(pinned_page);
1385 1386
	ceph_put_cap_refs(ci, got);

Y
Yan, Zheng 已提交
1387
	if (ret != -EAGAIN)
1388
		goto out_restore;
Y
Yan, Zheng 已提交
1389 1390

	/* read inline data */
1391
	if (off >= PAGE_SIZE) {
Y
Yan, Zheng 已提交
1392 1393 1394 1395 1396 1397
		/* does not support inline data > PAGE_SIZE */
		ret = VM_FAULT_SIGBUS;
	} else {
		int ret1;
		struct address_space *mapping = inode->i_mapping;
		struct page *page = find_or_create_page(mapping, 0,
1398 1399
						mapping_gfp_constraint(mapping,
						~__GFP_FS));
Y
Yan, Zheng 已提交
1400 1401
		if (!page) {
			ret = VM_FAULT_OOM;
1402
			goto out_inline;
Y
Yan, Zheng 已提交
1403 1404 1405 1406 1407
		}
		ret1 = __ceph_do_getattr(inode, page,
					 CEPH_STAT_CAP_INLINE_DATA, true);
		if (ret1 < 0 || off >= i_size_read(inode)) {
			unlock_page(page);
1408
			put_page(page);
1409 1410 1411 1412
			if (ret1 < 0)
				ret = ret1;
			else
				ret = VM_FAULT_SIGBUS;
1413
			goto out_inline;
Y
Yan, Zheng 已提交
1414
		}
1415 1416
		if (ret1 < PAGE_SIZE)
			zero_user_segment(page, ret1, PAGE_SIZE);
Y
Yan, Zheng 已提交
1417 1418 1419 1420 1421
		else
			flush_dcache_page(page);
		SetPageUptodate(page);
		vmf->page = page;
		ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1422 1423 1424
out_inline:
		dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
		     inode, off, (size_t)PAGE_SIZE, ret);
Y
Yan, Zheng 已提交
1425
	}
1426 1427
out_restore:
	ceph_restore_sigs(&oldset);
1428 1429 1430
	if (ret < 0)
		ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;

1431 1432
	return ret;
}
S
Sage Weil 已提交
1433 1434 1435 1436 1437 1438

/*
 * Reuse write_begin here for simplicity.
 */
static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
A
Al Viro 已提交
1439
	struct inode *inode = file_inode(vma->vm_file);
1440 1441
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_file_info *fi = vma->vm_file->private_data;
1442
	struct ceph_cap_flush *prealloc_cf;
1443
	struct page *page = vmf->page;
1444
	loff_t off = page_offset(page);
1445 1446 1447
	loff_t size = i_size_read(inode);
	size_t len;
	int want, got, ret;
1448
	sigset_t oldset;
1449

1450 1451
	prealloc_cf = ceph_alloc_cap_flush();
	if (!prealloc_cf)
1452
		return VM_FAULT_OOM;
1453

1454
	ceph_block_sigs(&oldset);
1455

1456 1457 1458 1459 1460 1461 1462 1463 1464
	if (ci->i_inline_version != CEPH_INLINE_NONE) {
		struct page *locked_page = NULL;
		if (off == 0) {
			lock_page(page);
			locked_page = page;
		}
		ret = ceph_uninline_data(vma->vm_file, locked_page);
		if (locked_page)
			unlock_page(locked_page);
1465
		if (ret < 0)
1466
			goto out_free;
1467 1468
	}

1469 1470
	if (off + PAGE_SIZE <= size)
		len = PAGE_SIZE;
S
Sage Weil 已提交
1471
	else
1472
		len = size & ~PAGE_MASK;
S
Sage Weil 已提交
1473

1474 1475 1476 1477 1478 1479
	dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
	     inode, ceph_vinop(inode), off, len, size);
	if (fi->fmode & CEPH_FILE_MODE_LAZY)
		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
	else
		want = CEPH_CAP_FILE_BUFFER;
1480 1481 1482 1483

	got = 0;
	ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
			    &got, NULL);
1484
	if (ret < 0)
1485
		goto out_free;
1486

1487 1488 1489 1490 1491
	dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
	     inode, off, len, ceph_cap_string(got));

	/* Update time before taking page lock */
	file_update_time(vma->vm_file);
1492

1493 1494
	do {
		lock_page(page);
1495

1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508
		if ((off > size) || (page->mapping != inode->i_mapping)) {
			unlock_page(page);
			ret = VM_FAULT_NOPAGE;
			break;
		}

		ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
		if (ret >= 0) {
			/* success.  we'll keep the page locked. */
			set_page_dirty(page);
			ret = VM_FAULT_LOCKED;
		}
	} while (ret == -EAGAIN);
1509

1510 1511
	if (ret == VM_FAULT_LOCKED ||
	    ci->i_inline_version != CEPH_INLINE_NONE) {
1512 1513
		int dirty;
		spin_lock(&ci->i_ceph_lock);
1514
		ci->i_inline_version = CEPH_INLINE_NONE;
1515 1516
		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
					       &prealloc_cf);
1517 1518 1519 1520 1521 1522 1523 1524
		spin_unlock(&ci->i_ceph_lock);
		if (dirty)
			__mark_inode_dirty(inode, dirty);
	}

	dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
	     inode, off, len, ceph_cap_string(got), ret);
	ceph_put_cap_refs(ci, got);
1525
out_free:
1526
	ceph_restore_sigs(&oldset);
1527
	ceph_free_cap_flush(prealloc_cf);
1528 1529
	if (ret < 0)
		ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
S
Sage Weil 已提交
1530 1531 1532
	return ret;
}

Y
Yan, Zheng 已提交
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544
void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
			   char	*data, size_t len)
{
	struct address_space *mapping = inode->i_mapping;
	struct page *page;

	if (locked_page) {
		page = locked_page;
	} else {
		if (i_size_read(inode) == 0)
			return;
		page = find_or_create_page(mapping, 0,
1545 1546
					   mapping_gfp_constraint(mapping,
					   ~__GFP_FS));
Y
Yan, Zheng 已提交
1547 1548 1549 1550
		if (!page)
			return;
		if (PageUptodate(page)) {
			unlock_page(page);
1551
			put_page(page);
Y
Yan, Zheng 已提交
1552 1553 1554 1555
			return;
		}
	}

1556
	dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
Y
Yan, Zheng 已提交
1557 1558 1559 1560 1561 1562 1563 1564 1565
	     inode, ceph_vinop(inode), len, locked_page);

	if (len > 0) {
		void *kaddr = kmap_atomic(page);
		memcpy(kaddr, data, len);
		kunmap_atomic(kaddr);
	}

	if (page != locked_page) {
1566 1567
		if (len < PAGE_SIZE)
			zero_user_segment(page, len, PAGE_SIZE);
Y
Yan, Zheng 已提交
1568 1569 1570 1571 1572
		else
			flush_dcache_page(page);

		SetPageUptodate(page);
		unlock_page(page);
1573
		put_page(page);
Y
Yan, Zheng 已提交
1574 1575 1576
	}
}

1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
int ceph_uninline_data(struct file *filp, struct page *locked_page)
{
	struct inode *inode = file_inode(filp);
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_osd_request *req;
	struct page *page = NULL;
	u64 len, inline_version;
	int err = 0;
	bool from_pagecache = false;

	spin_lock(&ci->i_ceph_lock);
	inline_version = ci->i_inline_version;
	spin_unlock(&ci->i_ceph_lock);

	dout("uninline_data %p %llx.%llx inline_version %llu\n",
	     inode, ceph_vinop(inode), inline_version);

	if (inline_version == 1 || /* initial version, no data */
	    inline_version == CEPH_INLINE_NONE)
		goto out;

	if (locked_page) {
		page = locked_page;
		WARN_ON(!PageUptodate(page));
	} else if (ceph_caps_issued(ci) &
		   (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
		page = find_get_page(inode->i_mapping, 0);
		if (page) {
			if (PageUptodate(page)) {
				from_pagecache = true;
				lock_page(page);
			} else {
1610
				put_page(page);
1611 1612 1613 1614 1615 1616 1617
				page = NULL;
			}
		}
	}

	if (page) {
		len = i_size_read(inode);
1618 1619
		if (len > PAGE_SIZE)
			len = PAGE_SIZE;
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
	} else {
		page = __page_cache_alloc(GFP_NOFS);
		if (!page) {
			err = -ENOMEM;
			goto out;
		}
		err = __ceph_do_getattr(inode, page,
					CEPH_STAT_CAP_INLINE_DATA, true);
		if (err < 0) {
			/* no inline data */
			if (err == -ENODATA)
				err = 0;
			goto out;
		}
		len = err;
	}

	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
				    ceph_vino(inode), 0, &len, 0, 1,
				    CEPH_OSD_OP_CREATE,
				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
I
Ilya Dryomov 已提交
1641
				    NULL, 0, 0, false);
1642 1643 1644 1645 1646
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}

1647
	req->r_mtime = inode->i_mtime;
1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658
	err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
	if (!err)
		err = ceph_osdc_wait_request(&fsc->client->osdc, req);
	ceph_osdc_put_request(req);
	if (err < 0)
		goto out;

	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
				    ceph_vino(inode), 0, &len, 1, 3,
				    CEPH_OSD_OP_WRITE,
				    CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
I
Ilya Dryomov 已提交
1659 1660
				    NULL, ci->i_truncate_seq,
				    ci->i_truncate_size, false);
1661 1662 1663 1664 1665 1666 1667
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}

	osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);

Y
Yan, Zheng 已提交
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
	{
		__le64 xattr_buf = cpu_to_le64(inline_version);
		err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
					    "inline_version", &xattr_buf,
					    sizeof(xattr_buf),
					    CEPH_OSD_CMPXATTR_OP_GT,
					    CEPH_OSD_CMPXATTR_MODE_U64);
		if (err)
			goto out_put;
	}

	{
		char xattr_buf[32];
		int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
					 "%llu", inline_version);
		err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
					    "inline_version",
					    xattr_buf, xattr_len, 0, 0);
		if (err)
			goto out_put;
	}
1689

1690
	req->r_mtime = inode->i_mtime;
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701
	err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
	if (!err)
		err = ceph_osdc_wait_request(&fsc->client->osdc, req);
out_put:
	ceph_osdc_put_request(req);
	if (err == -ECANCELED)
		err = 0;
out:
	if (page && page != locked_page) {
		if (from_pagecache) {
			unlock_page(page);
1702
			put_page(page);
1703 1704 1705 1706 1707 1708 1709 1710 1711
		} else
			__free_pages(page, 0);
	}

	dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
	     inode, ceph_vinop(inode), inline_version, err);
	return err;
}

1712
static const struct vm_operations_struct ceph_vmops = {
1713
	.fault		= ceph_filemap_fault,
S
Sage Weil 已提交
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
	.page_mkwrite	= ceph_page_mkwrite,
};

int ceph_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct address_space *mapping = file->f_mapping;

	if (!mapping->a_ops->readpage)
		return -ENOEXEC;
	file_accessed(file);
	vma->vm_ops = &ceph_vmops;
	return 0;
}
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780

enum {
	POOL_READ	= 1,
	POOL_WRITE	= 2,
};

static int __ceph_pool_perm_get(struct ceph_inode_info *ci, u32 pool)
{
	struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
	struct ceph_mds_client *mdsc = fsc->mdsc;
	struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
	struct rb_node **p, *parent;
	struct ceph_pool_perm *perm;
	struct page **pages;
	int err = 0, err2 = 0, have = 0;

	down_read(&mdsc->pool_perm_rwsem);
	p = &mdsc->pool_perm_tree.rb_node;
	while (*p) {
		perm = rb_entry(*p, struct ceph_pool_perm, node);
		if (pool < perm->pool)
			p = &(*p)->rb_left;
		else if (pool > perm->pool)
			p = &(*p)->rb_right;
		else {
			have = perm->perm;
			break;
		}
	}
	up_read(&mdsc->pool_perm_rwsem);
	if (*p)
		goto out;

	dout("__ceph_pool_perm_get pool %u no perm cached\n", pool);

	down_write(&mdsc->pool_perm_rwsem);
	parent = NULL;
	while (*p) {
		parent = *p;
		perm = rb_entry(parent, struct ceph_pool_perm, node);
		if (pool < perm->pool)
			p = &(*p)->rb_left;
		else if (pool > perm->pool)
			p = &(*p)->rb_right;
		else {
			have = perm->perm;
			break;
		}
	}
	if (*p) {
		up_write(&mdsc->pool_perm_rwsem);
		goto out;
	}

I
Ilya Dryomov 已提交
1781
	rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1782 1783 1784 1785 1786 1787 1788 1789 1790
					 1, false, GFP_NOFS);
	if (!rd_req) {
		err = -ENOMEM;
		goto out_unlock;
	}

	rd_req->r_flags = CEPH_OSD_FLAG_READ;
	osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
	rd_req->r_base_oloc.pool = pool;
1791
	ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1792

1793 1794 1795
	err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
	if (err)
		goto out_unlock;
1796

I
Ilya Dryomov 已提交
1797
	wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1798 1799 1800 1801 1802 1803
					 1, false, GFP_NOFS);
	if (!wr_req) {
		err = -ENOMEM;
		goto out_unlock;
	}

1804
	wr_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ACK;
1805
	osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1806
	ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1807
	ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1808

1809 1810 1811
	err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
	if (err)
		goto out_unlock;
1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823

	/* one page should be large enough for STAT data */
	pages = ceph_alloc_page_vector(1, GFP_KERNEL);
	if (IS_ERR(pages)) {
		err = PTR_ERR(pages);
		goto out_unlock;
	}

	osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
				     0, false, true);
	err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);

1824
	wr_req->r_mtime = ci->vfs_inode.i_mtime;
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857
	err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);

	if (!err)
		err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
	if (!err2)
		err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);

	if (err >= 0 || err == -ENOENT)
		have |= POOL_READ;
	else if (err != -EPERM)
		goto out_unlock;

	if (err2 == 0 || err2 == -EEXIST)
		have |= POOL_WRITE;
	else if (err2 != -EPERM) {
		err = err2;
		goto out_unlock;
	}

	perm = kmalloc(sizeof(*perm), GFP_NOFS);
	if (!perm) {
		err = -ENOMEM;
		goto out_unlock;
	}

	perm->pool = pool;
	perm->perm = have;
	rb_link_node(&perm->node, parent, p);
	rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
	err = 0;
out_unlock:
	up_write(&mdsc->pool_perm_rwsem);

1858 1859
	ceph_osdc_put_request(rd_req);
	ceph_osdc_put_request(wr_req);
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
out:
	if (!err)
		err = have;
	dout("__ceph_pool_perm_get pool %u result = %d\n", pool, err);
	return err;
}

int ceph_pool_perm_check(struct ceph_inode_info *ci, int need)
{
	u32 pool;
	int ret, flags;

1872 1873 1874 1875
	/* does not support pool namespace yet */
	if (ci->i_pool_ns_len)
		return -EIO;

1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931
	if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode),
				NOPOOLPERM))
		return 0;

	spin_lock(&ci->i_ceph_lock);
	flags = ci->i_ceph_flags;
	pool = ceph_file_layout_pg_pool(ci->i_layout);
	spin_unlock(&ci->i_ceph_lock);
check:
	if (flags & CEPH_I_POOL_PERM) {
		if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
			dout("ceph_pool_perm_check pool %u no read perm\n",
			     pool);
			return -EPERM;
		}
		if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
			dout("ceph_pool_perm_check pool %u no write perm\n",
			     pool);
			return -EPERM;
		}
		return 0;
	}

	ret = __ceph_pool_perm_get(ci, pool);
	if (ret < 0)
		return ret;

	flags = CEPH_I_POOL_PERM;
	if (ret & POOL_READ)
		flags |= CEPH_I_POOL_RD;
	if (ret & POOL_WRITE)
		flags |= CEPH_I_POOL_WR;

	spin_lock(&ci->i_ceph_lock);
	if (pool == ceph_file_layout_pg_pool(ci->i_layout)) {
		ci->i_ceph_flags = flags;
        } else {
		pool = ceph_file_layout_pg_pool(ci->i_layout);
		flags = ci->i_ceph_flags;
	}
	spin_unlock(&ci->i_ceph_lock);
	goto check;
}

void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
{
	struct ceph_pool_perm *perm;
	struct rb_node *n;

	while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
		n = rb_first(&mdsc->pool_perm_tree);
		perm = rb_entry(n, struct ceph_pool_perm, node);
		rb_erase(n, &mdsc->pool_perm_tree);
		kfree(perm);
	}
}