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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
1d3576fd SW |
3 | |
4 | #include <linux/backing-dev.h> | |
5 | #include <linux/fs.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/pagemap.h> | |
8 | #include <linux/writeback.h> /* generic_writepages */ | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
1d3576fd SW |
10 | #include <linux/pagevec.h> |
11 | #include <linux/task_io_accounting_ops.h> | |
f361bf4a | 12 | #include <linux/signal.h> |
5c308356 | 13 | #include <linux/iversion.h> |
1d3576fd SW |
14 | |
15 | #include "super.h" | |
3d14c5d2 | 16 | #include "mds_client.h" |
99ccbd22 | 17 | #include "cache.h" |
3d14c5d2 | 18 | #include <linux/ceph/osd_client.h> |
08c1ac50 | 19 | #include <linux/ceph/striper.h> |
1d3576fd SW |
20 | |
21 | /* | |
22 | * Ceph address space ops. | |
23 | * | |
24 | * There are a few funny things going on here. | |
25 | * | |
26 | * The page->private field is used to reference a struct | |
27 | * ceph_snap_context for _every_ dirty page. This indicates which | |
28 | * snapshot the page was logically dirtied in, and thus which snap | |
29 | * context needs to be associated with the osd write during writeback. | |
30 | * | |
31 | * Similarly, struct ceph_inode_info maintains a set of counters to | |
25985edc | 32 | * count dirty pages on the inode. In the absence of snapshots, |
1d3576fd SW |
33 | * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. |
34 | * | |
35 | * When a snapshot is taken (that is, when the client receives | |
36 | * notification that a snapshot was taken), each inode with caps and | |
37 | * with dirty pages (dirty pages implies there is a cap) gets a new | |
38 | * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending | |
39 | * order, new snaps go to the tail). The i_wrbuffer_ref_head count is | |
40 | * moved to capsnap->dirty. (Unless a sync write is currently in | |
41 | * progress. In that case, the capsnap is said to be "pending", new | |
42 | * writes cannot start, and the capsnap isn't "finalized" until the | |
43 | * write completes (or fails) and a final size/mtime for the inode for | |
44 | * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. | |
45 | * | |
46 | * On writeback, we must submit writes to the osd IN SNAP ORDER. So, | |
47 | * we look for the first capsnap in i_cap_snaps and write out pages in | |
48 | * that snap context _only_. Then we move on to the next capsnap, | |
49 | * eventually reaching the "live" or "head" context (i.e., pages that | |
50 | * are not yet snapped) and are writing the most recently dirtied | |
51 | * pages. | |
52 | * | |
53 | * Invalidate and so forth must take care to ensure the dirty page | |
54 | * accounting is preserved. | |
55 | */ | |
56 | ||
2baba250 YS |
57 | #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) |
58 | #define CONGESTION_OFF_THRESH(congestion_kb) \ | |
59 | (CONGESTION_ON_THRESH(congestion_kb) - \ | |
60 | (CONGESTION_ON_THRESH(congestion_kb) >> 2)) | |
61 | ||
61600ef8 YZ |
62 | static inline struct ceph_snap_context *page_snap_context(struct page *page) |
63 | { | |
64 | if (PagePrivate(page)) | |
65 | return (void *)page->private; | |
66 | return NULL; | |
67 | } | |
1d3576fd SW |
68 | |
69 | /* | |
70 | * Dirty a page. Optimistically adjust accounting, on the assumption | |
71 | * that we won't race with invalidate. If we do, readjust. | |
72 | */ | |
73 | static int ceph_set_page_dirty(struct page *page) | |
74 | { | |
75 | struct address_space *mapping = page->mapping; | |
76 | struct inode *inode; | |
77 | struct ceph_inode_info *ci; | |
1d3576fd | 78 | struct ceph_snap_context *snapc; |
7d6e1f54 | 79 | int ret; |
1d3576fd SW |
80 | |
81 | if (unlikely(!mapping)) | |
82 | return !TestSetPageDirty(page); | |
83 | ||
7d6e1f54 | 84 | if (PageDirty(page)) { |
1d3576fd SW |
85 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
86 | mapping->host, page, page->index); | |
7d6e1f54 | 87 | BUG_ON(!PagePrivate(page)); |
1d3576fd SW |
88 | return 0; |
89 | } | |
90 | ||
91 | inode = mapping->host; | |
92 | ci = ceph_inode(inode); | |
93 | ||
1d3576fd | 94 | /* dirty the head */ |
be655596 | 95 | spin_lock(&ci->i_ceph_lock); |
5dda377c YZ |
96 | BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference |
97 | if (__ceph_have_pending_cap_snap(ci)) { | |
98 | struct ceph_cap_snap *capsnap = | |
99 | list_last_entry(&ci->i_cap_snaps, | |
100 | struct ceph_cap_snap, | |
101 | ci_item); | |
102 | snapc = ceph_get_snap_context(capsnap->context); | |
103 | capsnap->dirty_pages++; | |
104 | } else { | |
105 | BUG_ON(!ci->i_head_snapc); | |
106 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
107 | ++ci->i_wrbuffer_ref_head; | |
108 | } | |
1d3576fd | 109 | if (ci->i_wrbuffer_ref == 0) |
0444d76a | 110 | ihold(inode); |
1d3576fd SW |
111 | ++ci->i_wrbuffer_ref; |
112 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " | |
113 | "snapc %p seq %lld (%d snaps)\n", | |
114 | mapping->host, page, page->index, | |
115 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, | |
116 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
117 | snapc, snapc->seq, snapc->num_snaps); | |
be655596 | 118 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd | 119 | |
7d6e1f54 SZ |
120 | /* |
121 | * Reference snap context in page->private. Also set | |
122 | * PagePrivate so that we get invalidatepage callback. | |
123 | */ | |
124 | BUG_ON(PagePrivate(page)); | |
125 | page->private = (unsigned long)snapc; | |
126 | SetPagePrivate(page); | |
1d3576fd | 127 | |
7d6e1f54 SZ |
128 | ret = __set_page_dirty_nobuffers(page); |
129 | WARN_ON(!PageLocked(page)); | |
130 | WARN_ON(!page->mapping); | |
1d3576fd | 131 | |
7d6e1f54 | 132 | return ret; |
1d3576fd SW |
133 | } |
134 | ||
135 | /* | |
136 | * If we are truncating the full page (i.e. offset == 0), adjust the | |
137 | * dirty page counters appropriately. Only called if there is private | |
138 | * data on the page. | |
139 | */ | |
d47992f8 LC |
140 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
141 | unsigned int length) | |
1d3576fd | 142 | { |
4ce1e9ad | 143 | struct inode *inode; |
1d3576fd | 144 | struct ceph_inode_info *ci; |
61600ef8 | 145 | struct ceph_snap_context *snapc = page_snap_context(page); |
1d3576fd | 146 | |
4ce1e9ad | 147 | inode = page->mapping->host; |
b150f5c1 MT |
148 | ci = ceph_inode(inode); |
149 | ||
09cbfeaf | 150 | if (offset != 0 || length != PAGE_SIZE) { |
b150f5c1 MT |
151 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
152 | inode, page, page->index, offset, length); | |
153 | return; | |
154 | } | |
4ce1e9ad | 155 | |
99ccbd22 MT |
156 | ceph_invalidate_fscache_page(inode, page); |
157 | ||
b072d774 | 158 | WARN_ON(!PageLocked(page)); |
99ccbd22 MT |
159 | if (!PagePrivate(page)) |
160 | return; | |
161 | ||
b150f5c1 | 162 | ClearPageChecked(page); |
1d3576fd | 163 | |
b150f5c1 MT |
164 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
165 | inode, page, page->index); | |
166 | ||
167 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
168 | ceph_put_snap_context(snapc); | |
169 | page->private = 0; | |
170 | ClearPagePrivate(page); | |
1d3576fd SW |
171 | } |
172 | ||
1d3576fd SW |
173 | static int ceph_releasepage(struct page *page, gfp_t g) |
174 | { | |
e55f1a18 N |
175 | dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, |
176 | page, page->index, PageDirty(page) ? "" : "not "); | |
99ccbd22 MT |
177 | |
178 | /* Can we release the page from the cache? */ | |
179 | if (!ceph_release_fscache_page(page, g)) | |
180 | return 0; | |
181 | ||
182 | return !PagePrivate(page); | |
1d3576fd SW |
183 | } |
184 | ||
185 | /* | |
186 | * read a single page, without unlocking it. | |
187 | */ | |
dd2bc473 | 188 | static int ceph_do_readpage(struct file *filp, struct page *page) |
1d3576fd | 189 | { |
496ad9aa | 190 | struct inode *inode = file_inode(filp); |
1d3576fd | 191 | struct ceph_inode_info *ci = ceph_inode(inode); |
131d7eb4 | 192 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 193 | int err = 0; |
83701246 | 194 | u64 off = page_offset(page); |
09cbfeaf | 195 | u64 len = PAGE_SIZE; |
1d3576fd | 196 | |
83701246 | 197 | if (off >= i_size_read(inode)) { |
09cbfeaf | 198 | zero_user_segment(page, 0, PAGE_SIZE); |
83701246 YZ |
199 | SetPageUptodate(page); |
200 | return 0; | |
201 | } | |
99ccbd22 | 202 | |
fcc02d2a YZ |
203 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
204 | /* | |
205 | * Uptodate inline data should have been added | |
206 | * into page cache while getting Fcr caps. | |
207 | */ | |
208 | if (off == 0) | |
209 | return -EINVAL; | |
09cbfeaf | 210 | zero_user_segment(page, 0, PAGE_SIZE); |
fcc02d2a YZ |
211 | SetPageUptodate(page); |
212 | return 0; | |
213 | } | |
83701246 YZ |
214 | |
215 | err = ceph_readpage_from_fscache(inode, page); | |
99ccbd22 | 216 | if (err == 0) |
dd2bc473 | 217 | return -EINPROGRESS; |
99ccbd22 | 218 | |
1d3576fd SW |
219 | dout("readpage inode %p file %p page %p index %lu\n", |
220 | inode, filp, page, page->index); | |
131d7eb4 YZ |
221 | err = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
222 | &ci->i_layout, off, &len, | |
1d3576fd | 223 | ci->i_truncate_seq, ci->i_truncate_size, |
b7495fc2 | 224 | &page, 1, 0); |
1d3576fd SW |
225 | if (err == -ENOENT) |
226 | err = 0; | |
227 | if (err < 0) { | |
228 | SetPageError(page); | |
18302805 | 229 | ceph_fscache_readpage_cancel(inode, page); |
131d7eb4 YZ |
230 | if (err == -EBLACKLISTED) |
231 | fsc->blacklisted = true; | |
1d3576fd | 232 | goto out; |
1d3576fd | 233 | } |
09cbfeaf | 234 | if (err < PAGE_SIZE) |
23cd573b | 235 | /* zero fill remainder of page */ |
09cbfeaf | 236 | zero_user_segment(page, err, PAGE_SIZE); |
23cd573b ZZ |
237 | else |
238 | flush_dcache_page(page); | |
1d3576fd | 239 | |
23cd573b ZZ |
240 | SetPageUptodate(page); |
241 | ceph_readpage_to_fscache(inode, page); | |
99ccbd22 | 242 | |
1d3576fd SW |
243 | out: |
244 | return err < 0 ? err : 0; | |
245 | } | |
246 | ||
247 | static int ceph_readpage(struct file *filp, struct page *page) | |
248 | { | |
dd2bc473 YZ |
249 | int r = ceph_do_readpage(filp, page); |
250 | if (r != -EINPROGRESS) | |
251 | unlock_page(page); | |
252 | else | |
253 | r = 0; | |
1d3576fd SW |
254 | return r; |
255 | } | |
256 | ||
257 | /* | |
7c272194 | 258 | * Finish an async read(ahead) op. |
1d3576fd | 259 | */ |
85e084fe | 260 | static void finish_read(struct ceph_osd_request *req) |
1d3576fd | 261 | { |
7c272194 | 262 | struct inode *inode = req->r_inode; |
87060c10 | 263 | struct ceph_osd_data *osd_data; |
85e084fe ID |
264 | int rc = req->r_result <= 0 ? req->r_result : 0; |
265 | int bytes = req->r_result >= 0 ? req->r_result : 0; | |
e0c59487 | 266 | int num_pages; |
7c272194 | 267 | int i; |
1d3576fd | 268 | |
7c272194 | 269 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
131d7eb4 YZ |
270 | if (rc == -EBLACKLISTED) |
271 | ceph_inode_to_client(inode)->blacklisted = true; | |
7c272194 SW |
272 | |
273 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 274 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
275 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
276 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
277 | (u64)osd_data->length); | |
e0c59487 | 278 | for (i = 0; i < num_pages; i++) { |
87060c10 | 279 | struct page *page = osd_data->pages[i]; |
7c272194 | 280 | |
368e3585 YZ |
281 | if (rc < 0 && rc != -ENOENT) { |
282 | ceph_fscache_readpage_cancel(inode, page); | |
f36132a7 | 283 | goto unlock; |
368e3585 | 284 | } |
09cbfeaf | 285 | if (bytes < (int)PAGE_SIZE) { |
7c272194 SW |
286 | /* zero (remainder of) page */ |
287 | int s = bytes < 0 ? 0 : bytes; | |
09cbfeaf | 288 | zero_user_segment(page, s, PAGE_SIZE); |
1d3576fd | 289 | } |
7c272194 SW |
290 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
291 | page->index); | |
292 | flush_dcache_page(page); | |
293 | SetPageUptodate(page); | |
99ccbd22 | 294 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 295 | unlock: |
7c272194 | 296 | unlock_page(page); |
09cbfeaf KS |
297 | put_page(page); |
298 | bytes -= PAGE_SIZE; | |
1d3576fd | 299 | } |
87060c10 | 300 | kfree(osd_data->pages); |
1d3576fd SW |
301 | } |
302 | ||
303 | /* | |
7c272194 SW |
304 | * start an async read(ahead) operation. return nr_pages we submitted |
305 | * a read for on success, or negative error code. | |
1d3576fd | 306 | */ |
5d988308 YZ |
307 | static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, |
308 | struct list_head *page_list, int max) | |
1d3576fd | 309 | { |
3d14c5d2 YS |
310 | struct ceph_osd_client *osdc = |
311 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 | 312 | struct ceph_inode_info *ci = ceph_inode(inode); |
f86196ea | 313 | struct page *page = lru_to_page(page_list); |
acead002 | 314 | struct ceph_vino vino; |
7c272194 SW |
315 | struct ceph_osd_request *req; |
316 | u64 off; | |
1d3576fd | 317 | u64 len; |
7c272194 SW |
318 | int i; |
319 | struct page **pages; | |
320 | pgoff_t next_index; | |
321 | int nr_pages = 0; | |
2b1ac852 YZ |
322 | int got = 0; |
323 | int ret = 0; | |
324 | ||
5d988308 | 325 | if (!rw_ctx) { |
2b1ac852 YZ |
326 | /* caller of readpages does not hold buffer and read caps |
327 | * (fadvise, madvise and readahead cases) */ | |
328 | int want = CEPH_CAP_FILE_CACHE; | |
5e3ded1b YZ |
329 | ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, |
330 | true, &got); | |
2b1ac852 YZ |
331 | if (ret < 0) { |
332 | dout("start_read %p, error getting cap\n", inode); | |
333 | } else if (!(got & want)) { | |
334 | dout("start_read %p, no cache cap\n", inode); | |
335 | ret = 0; | |
336 | } | |
337 | if (ret <= 0) { | |
338 | if (got) | |
339 | ceph_put_cap_refs(ci, got); | |
340 | while (!list_empty(page_list)) { | |
f86196ea | 341 | page = lru_to_page(page_list); |
2b1ac852 YZ |
342 | list_del(&page->lru); |
343 | put_page(page); | |
344 | } | |
345 | return ret; | |
346 | } | |
347 | } | |
1d3576fd | 348 | |
6285bc23 | 349 | off = (u64) page_offset(page); |
1d3576fd | 350 | |
7c272194 SW |
351 | /* count pages */ |
352 | next_index = page->index; | |
353 | list_for_each_entry_reverse(page, page_list, lru) { | |
354 | if (page->index != next_index) | |
355 | break; | |
356 | nr_pages++; | |
357 | next_index++; | |
0d66a487 SW |
358 | if (max && nr_pages == max) |
359 | break; | |
7c272194 | 360 | } |
09cbfeaf | 361 | len = nr_pages << PAGE_SHIFT; |
7c272194 SW |
362 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
363 | off, len); | |
acead002 AE |
364 | vino = ceph_vino(inode); |
365 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 366 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 367 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 368 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 369 | false); |
2b1ac852 YZ |
370 | if (IS_ERR(req)) { |
371 | ret = PTR_ERR(req); | |
372 | goto out; | |
373 | } | |
1d3576fd | 374 | |
7c272194 | 375 | /* build page vector */ |
cf7b7e14 | 376 | nr_pages = calc_pages_for(0, len); |
6da2ec56 | 377 | pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); |
2b1ac852 YZ |
378 | if (!pages) { |
379 | ret = -ENOMEM; | |
380 | goto out_put; | |
381 | } | |
7c272194 SW |
382 | for (i = 0; i < nr_pages; ++i) { |
383 | page = list_entry(page_list->prev, struct page, lru); | |
384 | BUG_ON(PageLocked(page)); | |
1d3576fd | 385 | list_del(&page->lru); |
99ccbd22 | 386 | |
7c272194 SW |
387 | dout("start_read %p adding %p idx %lu\n", inode, page, |
388 | page->index); | |
389 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
687265e5 | 390 | GFP_KERNEL)) { |
d4d3aa38 | 391 | ceph_fscache_uncache_page(inode, page); |
09cbfeaf | 392 | put_page(page); |
7c272194 | 393 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 394 | inode, page); |
7c272194 | 395 | nr_pages = i; |
1afe4785 YZ |
396 | if (nr_pages > 0) { |
397 | len = nr_pages << PAGE_SHIFT; | |
d641df81 | 398 | osd_req_op_extent_update(req, 0, len); |
1afe4785 YZ |
399 | break; |
400 | } | |
7c272194 | 401 | goto out_pages; |
1d3576fd | 402 | } |
7c272194 | 403 | pages[i] = page; |
1d3576fd | 404 | } |
406e2c9f | 405 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
406 | req->r_callback = finish_read; |
407 | req->r_inode = inode; | |
408 | ||
409 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); | |
410 | ret = ceph_osdc_start_request(osdc, req, false); | |
411 | if (ret < 0) | |
412 | goto out_pages; | |
413 | ceph_osdc_put_request(req); | |
2b1ac852 YZ |
414 | |
415 | /* After adding locked pages to page cache, the inode holds cache cap. | |
416 | * So we can drop our cap refs. */ | |
417 | if (got) | |
418 | ceph_put_cap_refs(ci, got); | |
419 | ||
7c272194 SW |
420 | return nr_pages; |
421 | ||
422 | out_pages: | |
1afe4785 YZ |
423 | for (i = 0; i < nr_pages; ++i) { |
424 | ceph_fscache_readpage_cancel(inode, pages[i]); | |
425 | unlock_page(pages[i]); | |
426 | } | |
427 | ceph_put_page_vector(pages, nr_pages, false); | |
2b1ac852 | 428 | out_put: |
7c272194 | 429 | ceph_osdc_put_request(req); |
2b1ac852 YZ |
430 | out: |
431 | if (got) | |
432 | ceph_put_cap_refs(ci, got); | |
7c272194 SW |
433 | return ret; |
434 | } | |
1d3576fd | 435 | |
7c272194 SW |
436 | |
437 | /* | |
438 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
439 | * the caller (VM) cleans them up. | |
440 | */ | |
441 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
442 | struct list_head *page_list, unsigned nr_pages) | |
443 | { | |
496ad9aa | 444 | struct inode *inode = file_inode(file); |
0d66a487 | 445 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
73737682 | 446 | struct ceph_file_info *fi = file->private_data; |
5d988308 | 447 | struct ceph_rw_context *rw_ctx; |
7c272194 | 448 | int rc = 0; |
0d66a487 SW |
449 | int max = 0; |
450 | ||
83701246 YZ |
451 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
452 | return -EINVAL; | |
453 | ||
99ccbd22 MT |
454 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
455 | &nr_pages); | |
456 | ||
457 | if (rc == 0) | |
458 | goto out; | |
459 | ||
73737682 | 460 | rw_ctx = ceph_find_rw_context(fi); |
aa187926 | 461 | max = fsc->mount_options->rsize >> PAGE_SHIFT; |
5d988308 YZ |
462 | dout("readpages %p file %p ctx %p nr_pages %d max %d\n", |
463 | inode, file, rw_ctx, nr_pages, max); | |
7c272194 | 464 | while (!list_empty(page_list)) { |
5d988308 | 465 | rc = start_read(inode, rw_ctx, page_list, max); |
7c272194 SW |
466 | if (rc < 0) |
467 | goto out; | |
7c272194 | 468 | } |
1d3576fd | 469 | out: |
76be778b MT |
470 | ceph_fscache_readpages_cancel(inode, page_list); |
471 | ||
7c272194 | 472 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
473 | return rc; |
474 | } | |
475 | ||
1f934b00 YZ |
476 | struct ceph_writeback_ctl |
477 | { | |
478 | loff_t i_size; | |
479 | u64 truncate_size; | |
480 | u32 truncate_seq; | |
481 | bool size_stable; | |
2a2d927e | 482 | bool head_snapc; |
1f934b00 YZ |
483 | }; |
484 | ||
1d3576fd SW |
485 | /* |
486 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
487 | * only snap context we are allowed to write back. | |
1d3576fd | 488 | */ |
1f934b00 | 489 | static struct ceph_snap_context * |
05455e11 YZ |
490 | get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, |
491 | struct ceph_snap_context *page_snapc) | |
1d3576fd SW |
492 | { |
493 | struct ceph_inode_info *ci = ceph_inode(inode); | |
494 | struct ceph_snap_context *snapc = NULL; | |
495 | struct ceph_cap_snap *capsnap = NULL; | |
496 | ||
be655596 | 497 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
498 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
499 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
500 | capsnap->context, capsnap->dirty_pages); | |
05455e11 YZ |
501 | if (!capsnap->dirty_pages) |
502 | continue; | |
503 | ||
504 | /* get i_size, truncate_{seq,size} for page_snapc? */ | |
505 | if (snapc && capsnap->context != page_snapc) | |
506 | continue; | |
507 | ||
508 | if (ctl) { | |
509 | if (capsnap->writing) { | |
510 | ctl->i_size = i_size_read(inode); | |
511 | ctl->size_stable = false; | |
512 | } else { | |
513 | ctl->i_size = capsnap->size; | |
514 | ctl->size_stable = true; | |
1f934b00 | 515 | } |
05455e11 YZ |
516 | ctl->truncate_size = capsnap->truncate_size; |
517 | ctl->truncate_seq = capsnap->truncate_seq; | |
2a2d927e | 518 | ctl->head_snapc = false; |
1d3576fd | 519 | } |
05455e11 YZ |
520 | |
521 | if (snapc) | |
522 | break; | |
523 | ||
524 | snapc = ceph_get_snap_context(capsnap->context); | |
525 | if (!page_snapc || | |
526 | page_snapc == snapc || | |
527 | page_snapc->seq > snapc->seq) | |
528 | break; | |
1d3576fd | 529 | } |
7d8cb26d | 530 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 531 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
532 | dout(" head snapc %p has %d dirty pages\n", |
533 | snapc, ci->i_wrbuffer_ref_head); | |
1f934b00 YZ |
534 | if (ctl) { |
535 | ctl->i_size = i_size_read(inode); | |
536 | ctl->truncate_size = ci->i_truncate_size; | |
537 | ctl->truncate_seq = ci->i_truncate_seq; | |
538 | ctl->size_stable = false; | |
2a2d927e | 539 | ctl->head_snapc = true; |
1f934b00 | 540 | } |
1d3576fd | 541 | } |
be655596 | 542 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
543 | return snapc; |
544 | } | |
545 | ||
1f934b00 YZ |
546 | static u64 get_writepages_data_length(struct inode *inode, |
547 | struct page *page, u64 start) | |
548 | { | |
549 | struct ceph_inode_info *ci = ceph_inode(inode); | |
550 | struct ceph_snap_context *snapc = page_snap_context(page); | |
551 | struct ceph_cap_snap *capsnap = NULL; | |
552 | u64 end = i_size_read(inode); | |
553 | ||
554 | if (snapc != ci->i_head_snapc) { | |
555 | bool found = false; | |
556 | spin_lock(&ci->i_ceph_lock); | |
557 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
558 | if (capsnap->context == snapc) { | |
559 | if (!capsnap->writing) | |
560 | end = capsnap->size; | |
561 | found = true; | |
562 | break; | |
563 | } | |
564 | } | |
565 | spin_unlock(&ci->i_ceph_lock); | |
566 | WARN_ON(!found); | |
567 | } | |
568 | if (end > page_offset(page) + PAGE_SIZE) | |
569 | end = page_offset(page) + PAGE_SIZE; | |
570 | return end > start ? end - start : 0; | |
571 | } | |
572 | ||
1d3576fd SW |
573 | /* |
574 | * Write a single page, but leave the page locked. | |
575 | * | |
b72b13eb | 576 | * If we get a write error, mark the mapping for error, but still adjust the |
1d3576fd SW |
577 | * dirty page accounting (i.e., page is no longer dirty). |
578 | */ | |
579 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
580 | { | |
581 | struct inode *inode; | |
582 | struct ceph_inode_info *ci; | |
3d14c5d2 | 583 | struct ceph_fs_client *fsc; |
6298a337 | 584 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 585 | loff_t page_off = page_offset(page); |
43986881 | 586 | int err, len = PAGE_SIZE; |
1f934b00 | 587 | struct ceph_writeback_ctl ceph_wbc; |
1d3576fd SW |
588 | |
589 | dout("writepage %p idx %lu\n", page, page->index); | |
590 | ||
1d3576fd SW |
591 | inode = page->mapping->host; |
592 | ci = ceph_inode(inode); | |
3d14c5d2 | 593 | fsc = ceph_inode_to_client(inode); |
1d3576fd SW |
594 | |
595 | /* verify this is a writeable snap context */ | |
61600ef8 | 596 | snapc = page_snap_context(page); |
d37b1d99 | 597 | if (!snapc) { |
1d3576fd | 598 | dout("writepage %p page %p not dirty?\n", inode, page); |
43986881 | 599 | return 0; |
1d3576fd | 600 | } |
05455e11 | 601 | oldest = get_oldest_context(inode, &ceph_wbc, snapc); |
6298a337 | 602 | if (snapc->seq > oldest->seq) { |
1d3576fd | 603 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 604 | inode, page, snapc); |
1d3576fd | 605 | /* we should only noop if called by kswapd */ |
fa71fefb | 606 | WARN_ON(!(current->flags & PF_MEMALLOC)); |
6298a337 | 607 | ceph_put_snap_context(oldest); |
fa71fefb | 608 | redirty_page_for_writepage(wbc, page); |
43986881 | 609 | return 0; |
1d3576fd | 610 | } |
6298a337 | 611 | ceph_put_snap_context(oldest); |
1d3576fd SW |
612 | |
613 | /* is this a partial page at end of file? */ | |
1f934b00 YZ |
614 | if (page_off >= ceph_wbc.i_size) { |
615 | dout("%p page eof %llu\n", page, ceph_wbc.i_size); | |
05455e11 | 616 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
43986881 | 617 | return 0; |
fc2744aa | 618 | } |
43986881 | 619 | |
1f934b00 YZ |
620 | if (ceph_wbc.i_size < page_off + len) |
621 | len = ceph_wbc.i_size - page_off; | |
1d3576fd | 622 | |
1c0a9c2d YZ |
623 | dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", |
624 | inode, page, page->index, page_off, len, snapc, snapc->seq); | |
1d3576fd | 625 | |
314c4737 | 626 | if (atomic_long_inc_return(&fsc->writeback_count) > |
3d14c5d2 | 627 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
09dc9fc2 | 628 | set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
2baba250 | 629 | |
1d3576fd | 630 | set_page_writeback(page); |
1f934b00 YZ |
631 | err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), |
632 | &ci->i_layout, snapc, page_off, len, | |
633 | ceph_wbc.truncate_seq, | |
634 | ceph_wbc.truncate_size, | |
fac02ddf | 635 | &inode->i_mtime, &page, 1); |
1d3576fd | 636 | if (err < 0) { |
ad15ec06 YZ |
637 | struct writeback_control tmp_wbc; |
638 | if (!wbc) | |
639 | wbc = &tmp_wbc; | |
640 | if (err == -ERESTARTSYS) { | |
641 | /* killed by SIGKILL */ | |
642 | dout("writepage interrupted page %p\n", page); | |
643 | redirty_page_for_writepage(wbc, page); | |
644 | end_page_writeback(page); | |
43986881 | 645 | return err; |
ad15ec06 | 646 | } |
131d7eb4 YZ |
647 | if (err == -EBLACKLISTED) |
648 | fsc->blacklisted = true; | |
ad15ec06 YZ |
649 | dout("writepage setting page/mapping error %d %p\n", |
650 | err, page); | |
1d3576fd | 651 | mapping_set_error(&inode->i_data, err); |
ad15ec06 | 652 | wbc->pages_skipped++; |
1d3576fd SW |
653 | } else { |
654 | dout("writepage cleaned page %p\n", page); | |
655 | err = 0; /* vfs expects us to return 0 */ | |
656 | } | |
657 | page->private = 0; | |
658 | ClearPagePrivate(page); | |
659 | end_page_writeback(page); | |
660 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 661 | ceph_put_snap_context(snapc); /* page's reference */ |
314c4737 YZ |
662 | |
663 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
664 | CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) | |
665 | clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); | |
666 | ||
1d3576fd SW |
667 | return err; |
668 | } | |
669 | ||
670 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
671 | { | |
dbd646a8 YS |
672 | int err; |
673 | struct inode *inode = page->mapping->host; | |
674 | BUG_ON(!inode); | |
70b666c3 | 675 | ihold(inode); |
dbd646a8 | 676 | err = writepage_nounlock(page, wbc); |
ad15ec06 YZ |
677 | if (err == -ERESTARTSYS) { |
678 | /* direct memory reclaimer was killed by SIGKILL. return 0 | |
679 | * to prevent caller from setting mapping/page error */ | |
680 | err = 0; | |
681 | } | |
1d3576fd | 682 | unlock_page(page); |
dbd646a8 | 683 | iput(inode); |
1d3576fd SW |
684 | return err; |
685 | } | |
686 | ||
1d3576fd SW |
687 | /* |
688 | * async writeback completion handler. | |
689 | * | |
690 | * If we get an error, set the mapping error bit, but not the individual | |
691 | * page error bits. | |
692 | */ | |
85e084fe | 693 | static void writepages_finish(struct ceph_osd_request *req) |
1d3576fd SW |
694 | { |
695 | struct inode *inode = req->r_inode; | |
1d3576fd | 696 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 697 | struct ceph_osd_data *osd_data; |
1d3576fd | 698 | struct page *page; |
5b64640c YZ |
699 | int num_pages, total_pages = 0; |
700 | int i, j; | |
701 | int rc = req->r_result; | |
1d3576fd SW |
702 | struct ceph_snap_context *snapc = req->r_snapc; |
703 | struct address_space *mapping = inode->i_mapping; | |
3d14c5d2 | 704 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
5b64640c | 705 | bool remove_page; |
1d3576fd | 706 | |
5b64640c | 707 | dout("writepages_finish %p rc %d\n", inode, rc); |
26544c62 | 708 | if (rc < 0) { |
1d3576fd | 709 | mapping_set_error(mapping, rc); |
26544c62 | 710 | ceph_set_error_write(ci); |
131d7eb4 YZ |
711 | if (rc == -EBLACKLISTED) |
712 | fsc->blacklisted = true; | |
26544c62 JL |
713 | } else { |
714 | ceph_clear_error_write(ci); | |
715 | } | |
5b64640c YZ |
716 | |
717 | /* | |
718 | * We lost the cache cap, need to truncate the page before | |
719 | * it is unlocked, otherwise we'd truncate it later in the | |
720 | * page truncation thread, possibly losing some data that | |
721 | * raced its way in | |
722 | */ | |
723 | remove_page = !(ceph_caps_issued(ci) & | |
724 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); | |
1d3576fd SW |
725 | |
726 | /* clean all pages */ | |
5b64640c YZ |
727 | for (i = 0; i < req->r_num_ops; i++) { |
728 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) | |
729 | break; | |
e63dc5c7 | 730 | |
5b64640c YZ |
731 | osd_data = osd_req_op_extent_osd_data(req, i); |
732 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); | |
733 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
734 | (u64)osd_data->length); | |
735 | total_pages += num_pages; | |
736 | for (j = 0; j < num_pages; j++) { | |
737 | page = osd_data->pages[j]; | |
738 | BUG_ON(!page); | |
739 | WARN_ON(!PageUptodate(page)); | |
740 | ||
741 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
742 | CONGESTION_OFF_THRESH( | |
743 | fsc->mount_options->congestion_kb)) | |
09dc9fc2 | 744 | clear_bdi_congested(inode_to_bdi(inode), |
5b64640c YZ |
745 | BLK_RW_ASYNC); |
746 | ||
747 | ceph_put_snap_context(page_snap_context(page)); | |
748 | page->private = 0; | |
749 | ClearPagePrivate(page); | |
750 | dout("unlocking %p\n", page); | |
751 | end_page_writeback(page); | |
752 | ||
753 | if (remove_page) | |
754 | generic_error_remove_page(inode->i_mapping, | |
755 | page); | |
756 | ||
757 | unlock_page(page); | |
758 | } | |
759 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", | |
760 | inode, osd_data->length, rc >= 0 ? num_pages : 0); | |
e63dc5c7 | 761 | |
96ac9158 | 762 | release_pages(osd_data->pages, num_pages); |
1d3576fd | 763 | } |
1d3576fd | 764 | |
5b64640c YZ |
765 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
766 | ||
767 | osd_data = osd_req_op_extent_osd_data(req, 0); | |
87060c10 AE |
768 | if (osd_data->pages_from_pool) |
769 | mempool_free(osd_data->pages, | |
640ef79d | 770 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
1d3576fd | 771 | else |
87060c10 | 772 | kfree(osd_data->pages); |
1d3576fd SW |
773 | ceph_osdc_put_request(req); |
774 | } | |
775 | ||
1d3576fd SW |
776 | /* |
777 | * initiate async writeback | |
778 | */ | |
779 | static int ceph_writepages_start(struct address_space *mapping, | |
780 | struct writeback_control *wbc) | |
781 | { | |
782 | struct inode *inode = mapping->host; | |
1d3576fd | 783 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
784 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
785 | struct ceph_vino vino = ceph_vino(inode); | |
2a2d927e | 786 | pgoff_t index, start_index, end = -1; |
80e755fe | 787 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd | 788 | struct pagevec pvec; |
1d3576fd | 789 | int rc = 0; |
93407472 | 790 | unsigned int wsize = i_blocksize(inode); |
1d3576fd | 791 | struct ceph_osd_request *req = NULL; |
1f934b00 | 792 | struct ceph_writeback_ctl ceph_wbc; |
590e9d98 | 793 | bool should_loop, range_whole = false; |
af9cc401 | 794 | bool done = false; |
1d3576fd | 795 | |
3fb99d48 | 796 | dout("writepages_start %p (mode=%s)\n", inode, |
1d3576fd SW |
797 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : |
798 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
799 | ||
52953d55 | 800 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
801 | if (ci->i_wrbuffer_ref > 0) { |
802 | pr_warn_ratelimited( | |
803 | "writepage_start %p %lld forced umount\n", | |
804 | inode, ceph_ino(inode)); | |
805 | } | |
a341d4df | 806 | mapping_set_error(mapping, -EIO); |
1d3576fd SW |
807 | return -EIO; /* we're in a forced umount, don't write! */ |
808 | } | |
95cca2b4 | 809 | if (fsc->mount_options->wsize < wsize) |
3d14c5d2 | 810 | wsize = fsc->mount_options->wsize; |
1d3576fd | 811 | |
86679820 | 812 | pagevec_init(&pvec); |
1d3576fd | 813 | |
590e9d98 | 814 | start_index = wbc->range_cyclic ? mapping->writeback_index : 0; |
2a2d927e | 815 | index = start_index; |
1d3576fd SW |
816 | |
817 | retry: | |
818 | /* find oldest snap context with dirty data */ | |
05455e11 | 819 | snapc = get_oldest_context(inode, &ceph_wbc, NULL); |
1d3576fd SW |
820 | if (!snapc) { |
821 | /* hmm, why does writepages get called when there | |
822 | is no dirty data? */ | |
823 | dout(" no snap context with dirty data?\n"); | |
824 | goto out; | |
825 | } | |
826 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", | |
827 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa | 828 | |
2a2d927e YZ |
829 | should_loop = false; |
830 | if (ceph_wbc.head_snapc && snapc != last_snapc) { | |
831 | /* where to start/end? */ | |
832 | if (wbc->range_cyclic) { | |
833 | index = start_index; | |
834 | end = -1; | |
835 | if (index > 0) | |
836 | should_loop = true; | |
837 | dout(" cyclic, start at %lu\n", index); | |
838 | } else { | |
839 | index = wbc->range_start >> PAGE_SHIFT; | |
840 | end = wbc->range_end >> PAGE_SHIFT; | |
841 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
842 | range_whole = true; | |
843 | dout(" not cyclic, %lu to %lu\n", index, end); | |
844 | } | |
845 | } else if (!ceph_wbc.head_snapc) { | |
846 | /* Do not respect wbc->range_{start,end}. Dirty pages | |
847 | * in that range can be associated with newer snapc. | |
848 | * They are not writeable until we write all dirty pages | |
849 | * associated with 'snapc' get written */ | |
1582af2e | 850 | if (index > 0) |
2a2d927e YZ |
851 | should_loop = true; |
852 | dout(" non-head snapc, range whole\n"); | |
1d3576fd | 853 | } |
2a2d927e YZ |
854 | |
855 | ceph_put_snap_context(last_snapc); | |
1d3576fd SW |
856 | last_snapc = snapc; |
857 | ||
af9cc401 | 858 | while (!done && index <= end) { |
5b64640c | 859 | int num_ops = 0, op_idx; |
0e5ecac7 | 860 | unsigned i, pvec_pages, max_pages, locked_pages = 0; |
5b64640c | 861 | struct page **pages = NULL, **data_pages; |
e5975c7c | 862 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
1d3576fd | 863 | struct page *page; |
0e5ecac7 | 864 | pgoff_t strip_unit_end = 0; |
5b64640c | 865 | u64 offset = 0, len = 0; |
1d3576fd | 866 | |
0e5ecac7 | 867 | max_pages = wsize >> PAGE_SHIFT; |
1d3576fd SW |
868 | |
869 | get_more_pages: | |
4be90299 | 870 | pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index, |
0ed75fc8 | 871 | end, PAGECACHE_TAG_DIRTY, |
4be90299 | 872 | max_pages - locked_pages); |
0ed75fc8 | 873 | dout("pagevec_lookup_range_tag got %d\n", pvec_pages); |
1d3576fd SW |
874 | if (!pvec_pages && !locked_pages) |
875 | break; | |
876 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
877 | page = pvec.pages[i]; | |
878 | dout("? %p idx %lu\n", page, page->index); | |
879 | if (locked_pages == 0) | |
880 | lock_page(page); /* first page */ | |
881 | else if (!trylock_page(page)) | |
882 | break; | |
883 | ||
884 | /* only dirty pages, or our accounting breaks */ | |
885 | if (unlikely(!PageDirty(page)) || | |
886 | unlikely(page->mapping != mapping)) { | |
887 | dout("!dirty or !mapping %p\n", page); | |
888 | unlock_page(page); | |
0713e5f2 | 889 | continue; |
1d3576fd | 890 | } |
af9cc401 YZ |
891 | /* only if matching snap context */ |
892 | pgsnapc = page_snap_context(page); | |
893 | if (pgsnapc != snapc) { | |
894 | dout("page snapc %p %lld != oldest %p %lld\n", | |
895 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); | |
1582af2e YZ |
896 | if (!should_loop && |
897 | !ceph_wbc.head_snapc && | |
898 | wbc->sync_mode != WB_SYNC_NONE) | |
899 | should_loop = true; | |
1d3576fd | 900 | unlock_page(page); |
af9cc401 | 901 | continue; |
1d3576fd | 902 | } |
1f934b00 YZ |
903 | if (page_offset(page) >= ceph_wbc.i_size) { |
904 | dout("%p page eof %llu\n", | |
905 | page, ceph_wbc.i_size); | |
c95f1c5f EC |
906 | if ((ceph_wbc.size_stable || |
907 | page_offset(page) >= i_size_read(inode)) && | |
908 | clear_page_dirty_for_io(page)) | |
af9cc401 YZ |
909 | mapping->a_ops->invalidatepage(page, |
910 | 0, PAGE_SIZE); | |
911 | unlock_page(page); | |
912 | continue; | |
913 | } | |
914 | if (strip_unit_end && (page->index > strip_unit_end)) { | |
915 | dout("end of strip unit %p\n", page); | |
1d3576fd SW |
916 | unlock_page(page); |
917 | break; | |
918 | } | |
919 | if (PageWriteback(page)) { | |
0713e5f2 YZ |
920 | if (wbc->sync_mode == WB_SYNC_NONE) { |
921 | dout("%p under writeback\n", page); | |
922 | unlock_page(page); | |
923 | continue; | |
924 | } | |
925 | dout("waiting on writeback %p\n", page); | |
926 | wait_on_page_writeback(page); | |
1d3576fd SW |
927 | } |
928 | ||
1d3576fd SW |
929 | if (!clear_page_dirty_for_io(page)) { |
930 | dout("%p !clear_page_dirty_for_io\n", page); | |
931 | unlock_page(page); | |
0713e5f2 | 932 | continue; |
1d3576fd SW |
933 | } |
934 | ||
e5975c7c AE |
935 | /* |
936 | * We have something to write. If this is | |
937 | * the first locked page this time through, | |
5b64640c YZ |
938 | * calculate max possinle write size and |
939 | * allocate a page array | |
e5975c7c | 940 | */ |
1d3576fd | 941 | if (locked_pages == 0) { |
5b64640c YZ |
942 | u64 objnum; |
943 | u64 objoff; | |
dccbf080 | 944 | u32 xlen; |
5b64640c | 945 | |
1d3576fd | 946 | /* prepare async write request */ |
e5975c7c | 947 | offset = (u64)page_offset(page); |
dccbf080 ID |
948 | ceph_calc_file_object_mapping(&ci->i_layout, |
949 | offset, wsize, | |
950 | &objnum, &objoff, | |
951 | &xlen); | |
952 | len = xlen; | |
8c71897b | 953 | |
3fb99d48 | 954 | num_ops = 1; |
5b64640c | 955 | strip_unit_end = page->index + |
09cbfeaf | 956 | ((len - 1) >> PAGE_SHIFT); |
88486957 | 957 | |
5b64640c | 958 | BUG_ON(pages); |
88486957 | 959 | max_pages = calc_pages_for(0, (u64)len); |
6da2ec56 KC |
960 | pages = kmalloc_array(max_pages, |
961 | sizeof(*pages), | |
962 | GFP_NOFS); | |
88486957 AE |
963 | if (!pages) { |
964 | pool = fsc->wb_pagevec_pool; | |
88486957 | 965 | pages = mempool_alloc(pool, GFP_NOFS); |
e5975c7c | 966 | BUG_ON(!pages); |
88486957 | 967 | } |
5b64640c YZ |
968 | |
969 | len = 0; | |
970 | } else if (page->index != | |
09cbfeaf | 971 | (offset + len) >> PAGE_SHIFT) { |
5b64640c YZ |
972 | if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : |
973 | CEPH_OSD_MAX_OPS)) { | |
974 | redirty_page_for_writepage(wbc, page); | |
975 | unlock_page(page); | |
976 | break; | |
977 | } | |
978 | ||
979 | num_ops++; | |
980 | offset = (u64)page_offset(page); | |
981 | len = 0; | |
1d3576fd SW |
982 | } |
983 | ||
984 | /* note position of first page in pvec */ | |
1d3576fd SW |
985 | dout("%p will write page %p idx %lu\n", |
986 | inode, page, page->index); | |
2baba250 | 987 | |
5b64640c YZ |
988 | if (atomic_long_inc_return(&fsc->writeback_count) > |
989 | CONGESTION_ON_THRESH( | |
3d14c5d2 | 990 | fsc->mount_options->congestion_kb)) { |
09dc9fc2 | 991 | set_bdi_congested(inode_to_bdi(inode), |
213c99ee | 992 | BLK_RW_ASYNC); |
2baba250 YS |
993 | } |
994 | ||
0713e5f2 YZ |
995 | |
996 | pages[locked_pages++] = page; | |
997 | pvec.pages[i] = NULL; | |
998 | ||
09cbfeaf | 999 | len += PAGE_SIZE; |
1d3576fd SW |
1000 | } |
1001 | ||
1002 | /* did we get anything? */ | |
1003 | if (!locked_pages) | |
1004 | goto release_pvec_pages; | |
1005 | if (i) { | |
0713e5f2 YZ |
1006 | unsigned j, n = 0; |
1007 | /* shift unused page to beginning of pvec */ | |
1008 | for (j = 0; j < pvec_pages; j++) { | |
1009 | if (!pvec.pages[j]) | |
1010 | continue; | |
1011 | if (n < j) | |
1012 | pvec.pages[n] = pvec.pages[j]; | |
1013 | n++; | |
1014 | } | |
1015 | pvec.nr = n; | |
1d3576fd SW |
1016 | |
1017 | if (pvec_pages && i == pvec_pages && | |
1018 | locked_pages < max_pages) { | |
1019 | dout("reached end pvec, trying for more\n"); | |
0713e5f2 | 1020 | pagevec_release(&pvec); |
1d3576fd SW |
1021 | goto get_more_pages; |
1022 | } | |
1d3576fd SW |
1023 | } |
1024 | ||
5b64640c | 1025 | new_request: |
e5975c7c | 1026 | offset = page_offset(pages[0]); |
5b64640c YZ |
1027 | len = wsize; |
1028 | ||
1029 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1030 | &ci->i_layout, vino, | |
1031 | offset, &len, 0, num_ops, | |
1f934b00 YZ |
1032 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
1033 | snapc, ceph_wbc.truncate_seq, | |
1034 | ceph_wbc.truncate_size, false); | |
5b64640c YZ |
1035 | if (IS_ERR(req)) { |
1036 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1037 | &ci->i_layout, vino, | |
1038 | offset, &len, 0, | |
1039 | min(num_ops, | |
1040 | CEPH_OSD_SLAB_OPS), | |
1041 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1042 | CEPH_OSD_FLAG_WRITE, |
1f934b00 YZ |
1043 | snapc, ceph_wbc.truncate_seq, |
1044 | ceph_wbc.truncate_size, true); | |
5b64640c | 1045 | BUG_ON(IS_ERR(req)); |
e1966b49 | 1046 | } |
5b64640c | 1047 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
09cbfeaf | 1048 | PAGE_SIZE - offset); |
5b64640c YZ |
1049 | |
1050 | req->r_callback = writepages_finish; | |
1051 | req->r_inode = inode; | |
1d3576fd | 1052 | |
5b64640c YZ |
1053 | /* Format the osd request message and submit the write */ |
1054 | len = 0; | |
1055 | data_pages = pages; | |
1056 | op_idx = 0; | |
1057 | for (i = 0; i < locked_pages; i++) { | |
1058 | u64 cur_offset = page_offset(pages[i]); | |
1059 | if (offset + len != cur_offset) { | |
3fb99d48 | 1060 | if (op_idx + 1 == req->r_num_ops) |
5b64640c YZ |
1061 | break; |
1062 | osd_req_op_extent_dup_last(req, op_idx, | |
1063 | cur_offset - offset); | |
1064 | dout("writepages got pages at %llu~%llu\n", | |
1065 | offset, len); | |
1066 | osd_req_op_extent_osd_data_pages(req, op_idx, | |
1067 | data_pages, len, 0, | |
a4ce40a9 | 1068 | !!pool, false); |
5b64640c | 1069 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1070 | |
5b64640c YZ |
1071 | len = 0; |
1072 | offset = cur_offset; | |
1073 | data_pages = pages + i; | |
1074 | op_idx++; | |
1075 | } | |
1076 | ||
1077 | set_page_writeback(pages[i]); | |
09cbfeaf | 1078 | len += PAGE_SIZE; |
5b64640c YZ |
1079 | } |
1080 | ||
1f934b00 YZ |
1081 | if (ceph_wbc.size_stable) { |
1082 | len = min(len, ceph_wbc.i_size - offset); | |
5b64640c YZ |
1083 | } else if (i == locked_pages) { |
1084 | /* writepages_finish() clears writeback pages | |
1085 | * according to the data length, so make sure | |
1086 | * data length covers all locked pages */ | |
09cbfeaf | 1087 | u64 min_len = len + 1 - PAGE_SIZE; |
1f934b00 YZ |
1088 | len = get_writepages_data_length(inode, pages[i - 1], |
1089 | offset); | |
5b64640c YZ |
1090 | len = max(len, min_len); |
1091 | } | |
1092 | dout("writepages got pages at %llu~%llu\n", offset, len); | |
e5975c7c | 1093 | |
5b64640c YZ |
1094 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
1095 | 0, !!pool, false); | |
1096 | osd_req_op_extent_update(req, op_idx, len); | |
e5975c7c | 1097 | |
5b64640c YZ |
1098 | BUG_ON(op_idx + 1 != req->r_num_ops); |
1099 | ||
1100 | pool = NULL; | |
1101 | if (i < locked_pages) { | |
1102 | BUG_ON(num_ops <= req->r_num_ops); | |
1103 | num_ops -= req->r_num_ops; | |
5b64640c YZ |
1104 | locked_pages -= i; |
1105 | ||
1106 | /* allocate new pages array for next request */ | |
1107 | data_pages = pages; | |
6da2ec56 KC |
1108 | pages = kmalloc_array(locked_pages, sizeof(*pages), |
1109 | GFP_NOFS); | |
5b64640c YZ |
1110 | if (!pages) { |
1111 | pool = fsc->wb_pagevec_pool; | |
1112 | pages = mempool_alloc(pool, GFP_NOFS); | |
1113 | BUG_ON(!pages); | |
1114 | } | |
1115 | memcpy(pages, data_pages + i, | |
1116 | locked_pages * sizeof(*pages)); | |
1117 | memset(data_pages + i, 0, | |
1118 | locked_pages * sizeof(*pages)); | |
1119 | } else { | |
1120 | BUG_ON(num_ops != req->r_num_ops); | |
1121 | index = pages[i - 1]->index + 1; | |
1122 | /* request message now owns the pages array */ | |
1123 | pages = NULL; | |
1124 | } | |
e5975c7c | 1125 | |
fac02ddf | 1126 | req->r_mtime = inode->i_mtime; |
9d6fcb08 SW |
1127 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
1128 | BUG_ON(rc); | |
1d3576fd SW |
1129 | req = NULL; |
1130 | ||
5b64640c YZ |
1131 | wbc->nr_to_write -= i; |
1132 | if (pages) | |
1133 | goto new_request; | |
1134 | ||
2a2d927e YZ |
1135 | /* |
1136 | * We stop writing back only if we are not doing | |
1137 | * integrity sync. In case of integrity sync we have to | |
1138 | * keep going until we have written all the pages | |
1139 | * we tagged for writeback prior to entering this loop. | |
1140 | */ | |
1141 | if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) | |
af9cc401 | 1142 | done = true; |
1d3576fd SW |
1143 | |
1144 | release_pvec_pages: | |
1145 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
1146 | pvec.nr ? pvec.pages[0] : NULL); | |
1147 | pagevec_release(&pvec); | |
1d3576fd SW |
1148 | } |
1149 | ||
1150 | if (should_loop && !done) { | |
1151 | /* more to do; loop back to beginning of file */ | |
1152 | dout("writepages looping back to beginning of file\n"); | |
2a2d927e | 1153 | end = start_index - 1; /* OK even when start_index == 0 */ |
f275635e YZ |
1154 | |
1155 | /* to write dirty pages associated with next snapc, | |
1156 | * we need to wait until current writes complete */ | |
1157 | if (wbc->sync_mode != WB_SYNC_NONE && | |
1158 | start_index == 0 && /* all dirty pages were checked */ | |
1159 | !ceph_wbc.head_snapc) { | |
1160 | struct page *page; | |
1161 | unsigned i, nr; | |
1162 | index = 0; | |
1163 | while ((index <= end) && | |
1164 | (nr = pagevec_lookup_tag(&pvec, mapping, &index, | |
67fd707f | 1165 | PAGECACHE_TAG_WRITEBACK))) { |
f275635e YZ |
1166 | for (i = 0; i < nr; i++) { |
1167 | page = pvec.pages[i]; | |
1168 | if (page_snap_context(page) != snapc) | |
1169 | continue; | |
1170 | wait_on_page_writeback(page); | |
1171 | } | |
1172 | pagevec_release(&pvec); | |
1173 | cond_resched(); | |
1174 | } | |
1175 | } | |
1176 | ||
2a2d927e | 1177 | start_index = 0; |
1d3576fd SW |
1178 | index = 0; |
1179 | goto retry; | |
1180 | } | |
1181 | ||
1182 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1183 | mapping->writeback_index = index; | |
1184 | ||
1185 | out: | |
3ed97d63 | 1186 | ceph_osdc_put_request(req); |
2a2d927e YZ |
1187 | ceph_put_snap_context(last_snapc); |
1188 | dout("writepages dend - startone, rc = %d\n", rc); | |
1d3576fd SW |
1189 | return rc; |
1190 | } | |
1191 | ||
1192 | ||
1193 | ||
1194 | /* | |
1195 | * See if a given @snapc is either writeable, or already written. | |
1196 | */ | |
1197 | static int context_is_writeable_or_written(struct inode *inode, | |
1198 | struct ceph_snap_context *snapc) | |
1199 | { | |
05455e11 | 1200 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); |
6298a337 SW |
1201 | int ret = !oldest || snapc->seq <= oldest->seq; |
1202 | ||
1203 | ceph_put_snap_context(oldest); | |
1204 | return ret; | |
1d3576fd SW |
1205 | } |
1206 | ||
1207 | /* | |
1208 | * We are only allowed to write into/dirty the page if the page is | |
1209 | * clean, or already dirty within the same snap context. | |
8f883c24 SW |
1210 | * |
1211 | * called with page locked. | |
1212 | * return success with page locked, | |
1213 | * or any failure (incl -EAGAIN) with page unlocked. | |
1d3576fd | 1214 | */ |
4af6b225 YS |
1215 | static int ceph_update_writeable_page(struct file *file, |
1216 | loff_t pos, unsigned len, | |
1217 | struct page *page) | |
1d3576fd | 1218 | { |
496ad9aa | 1219 | struct inode *inode = file_inode(file); |
6c93df5d | 1220 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 1221 | struct ceph_inode_info *ci = ceph_inode(inode); |
09cbfeaf KS |
1222 | loff_t page_off = pos & PAGE_MASK; |
1223 | int pos_in_page = pos & ~PAGE_MASK; | |
1d3576fd SW |
1224 | int end_in_page = pos_in_page + len; |
1225 | loff_t i_size; | |
1d3576fd | 1226 | int r; |
80e755fe | 1227 | struct ceph_snap_context *snapc, *oldest; |
1d3576fd | 1228 | |
52953d55 | 1229 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
1230 | dout(" page %p forced umount\n", page); |
1231 | unlock_page(page); | |
1232 | return -EIO; | |
1233 | } | |
1234 | ||
1d3576fd SW |
1235 | retry_locked: |
1236 | /* writepages currently holds page lock, but if we change that later, */ | |
1237 | wait_on_page_writeback(page); | |
1238 | ||
61600ef8 | 1239 | snapc = page_snap_context(page); |
80e755fe | 1240 | if (snapc && snapc != ci->i_head_snapc) { |
1d3576fd SW |
1241 | /* |
1242 | * this page is already dirty in another (older) snap | |
1243 | * context! is it writeable now? | |
1244 | */ | |
05455e11 | 1245 | oldest = get_oldest_context(inode, NULL, NULL); |
80e755fe | 1246 | if (snapc->seq > oldest->seq) { |
6298a337 | 1247 | ceph_put_snap_context(oldest); |
1d3576fd | 1248 | dout(" page %p snapc %p not current or oldest\n", |
6298a337 | 1249 | page, snapc); |
1d3576fd SW |
1250 | /* |
1251 | * queue for writeback, and wait for snapc to | |
1252 | * be writeable or written | |
1253 | */ | |
6298a337 | 1254 | snapc = ceph_get_snap_context(snapc); |
1d3576fd | 1255 | unlock_page(page); |
3c6f6b79 | 1256 | ceph_queue_writeback(inode); |
a78bbd4b | 1257 | r = wait_event_killable(ci->i_cap_wq, |
1d3576fd SW |
1258 | context_is_writeable_or_written(inode, snapc)); |
1259 | ceph_put_snap_context(snapc); | |
8f883c24 SW |
1260 | if (r == -ERESTARTSYS) |
1261 | return r; | |
4af6b225 | 1262 | return -EAGAIN; |
1d3576fd | 1263 | } |
6298a337 | 1264 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1265 | |
1266 | /* yay, writeable, do it now (without dropping page lock) */ | |
1267 | dout(" page %p snapc %p not current, but oldest\n", | |
1268 | page, snapc); | |
1269 | if (!clear_page_dirty_for_io(page)) | |
1270 | goto retry_locked; | |
1271 | r = writepage_nounlock(page, NULL); | |
1272 | if (r < 0) | |
dd2bc473 | 1273 | goto fail_unlock; |
1d3576fd SW |
1274 | goto retry_locked; |
1275 | } | |
1276 | ||
1277 | if (PageUptodate(page)) { | |
1278 | dout(" page %p already uptodate\n", page); | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | /* full page? */ | |
09cbfeaf | 1283 | if (pos_in_page == 0 && len == PAGE_SIZE) |
1d3576fd SW |
1284 | return 0; |
1285 | ||
1286 | /* past end of file? */ | |
99c88e69 | 1287 | i_size = i_size_read(inode); |
1d3576fd | 1288 | |
1d3576fd SW |
1289 | if (page_off >= i_size || |
1290 | (pos_in_page == 0 && (pos+len) >= i_size && | |
09cbfeaf | 1291 | end_in_page - pos_in_page != PAGE_SIZE)) { |
1d3576fd | 1292 | dout(" zeroing %p 0 - %d and %d - %d\n", |
09cbfeaf | 1293 | page, pos_in_page, end_in_page, (int)PAGE_SIZE); |
1d3576fd SW |
1294 | zero_user_segments(page, |
1295 | 0, pos_in_page, | |
09cbfeaf | 1296 | end_in_page, PAGE_SIZE); |
1d3576fd SW |
1297 | return 0; |
1298 | } | |
1299 | ||
1300 | /* we need to read it. */ | |
dd2bc473 YZ |
1301 | r = ceph_do_readpage(file, page); |
1302 | if (r < 0) { | |
1303 | if (r == -EINPROGRESS) | |
1304 | return -EAGAIN; | |
1305 | goto fail_unlock; | |
1306 | } | |
1d3576fd | 1307 | goto retry_locked; |
dd2bc473 | 1308 | fail_unlock: |
1d3576fd SW |
1309 | unlock_page(page); |
1310 | return r; | |
1311 | } | |
1312 | ||
4af6b225 YS |
1313 | /* |
1314 | * We are only allowed to write into/dirty the page if the page is | |
1315 | * clean, or already dirty within the same snap context. | |
1316 | */ | |
1317 | static int ceph_write_begin(struct file *file, struct address_space *mapping, | |
1318 | loff_t pos, unsigned len, unsigned flags, | |
1319 | struct page **pagep, void **fsdata) | |
1320 | { | |
496ad9aa | 1321 | struct inode *inode = file_inode(file); |
4af6b225 | 1322 | struct page *page; |
09cbfeaf | 1323 | pgoff_t index = pos >> PAGE_SHIFT; |
7971bd92 | 1324 | int r; |
4af6b225 YS |
1325 | |
1326 | do { | |
8f883c24 | 1327 | /* get a page */ |
4af6b225 | 1328 | page = grab_cache_page_write_begin(mapping, index, 0); |
7971bd92 SW |
1329 | if (!page) |
1330 | return -ENOMEM; | |
4af6b225 YS |
1331 | |
1332 | dout("write_begin file %p inode %p page %p %d~%d\n", file, | |
213c99ee | 1333 | inode, page, (int)pos, (int)len); |
4af6b225 YS |
1334 | |
1335 | r = ceph_update_writeable_page(file, pos, len, page); | |
c1d00b2d | 1336 | if (r < 0) |
09cbfeaf | 1337 | put_page(page); |
c1d00b2d TK |
1338 | else |
1339 | *pagep = page; | |
4af6b225 YS |
1340 | } while (r == -EAGAIN); |
1341 | ||
1342 | return r; | |
1343 | } | |
1344 | ||
1d3576fd SW |
1345 | /* |
1346 | * we don't do anything in here that simple_write_end doesn't do | |
5dda377c | 1347 | * except adjust dirty page accounting |
1d3576fd SW |
1348 | */ |
1349 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1350 | loff_t pos, unsigned len, unsigned copied, | |
1351 | struct page *page, void *fsdata) | |
1352 | { | |
496ad9aa | 1353 | struct inode *inode = file_inode(file); |
efb0ca76 | 1354 | bool check_cap = false; |
1d3576fd SW |
1355 | |
1356 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1357 | inode, page, (int)pos, (int)copied, (int)len); | |
1358 | ||
1359 | /* zero the stale part of the page if we did a short copy */ | |
b9de313c AV |
1360 | if (!PageUptodate(page)) { |
1361 | if (copied < len) { | |
1362 | copied = 0; | |
1363 | goto out; | |
1364 | } | |
1365 | SetPageUptodate(page); | |
1366 | } | |
1d3576fd SW |
1367 | |
1368 | /* did file size increase? */ | |
99c88e69 | 1369 | if (pos+copied > i_size_read(inode)) |
1d3576fd SW |
1370 | check_cap = ceph_inode_set_size(inode, pos+copied); |
1371 | ||
1d3576fd SW |
1372 | set_page_dirty(page); |
1373 | ||
b9de313c | 1374 | out: |
1d3576fd | 1375 | unlock_page(page); |
09cbfeaf | 1376 | put_page(page); |
1d3576fd SW |
1377 | |
1378 | if (check_cap) | |
1379 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1380 | ||
1381 | return copied; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * we set .direct_IO to indicate direct io is supported, but since we | |
1386 | * intercept O_DIRECT reads and writes early, this function should | |
1387 | * never get called. | |
1388 | */ | |
c8b8e32d | 1389 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
1d3576fd SW |
1390 | { |
1391 | WARN_ON(1); | |
1392 | return -EINVAL; | |
1393 | } | |
1394 | ||
1395 | const struct address_space_operations ceph_aops = { | |
1396 | .readpage = ceph_readpage, | |
1397 | .readpages = ceph_readpages, | |
1398 | .writepage = ceph_writepage, | |
1399 | .writepages = ceph_writepages_start, | |
1400 | .write_begin = ceph_write_begin, | |
1401 | .write_end = ceph_write_end, | |
1402 | .set_page_dirty = ceph_set_page_dirty, | |
1403 | .invalidatepage = ceph_invalidatepage, | |
1404 | .releasepage = ceph_releasepage, | |
1405 | .direct_IO = ceph_direct_io, | |
1406 | }; | |
1407 | ||
4f7e89f6 YZ |
1408 | static void ceph_block_sigs(sigset_t *oldset) |
1409 | { | |
1410 | sigset_t mask; | |
1411 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
1412 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
1413 | } | |
1414 | ||
1415 | static void ceph_restore_sigs(sigset_t *oldset) | |
1416 | { | |
1417 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
1418 | } | |
1d3576fd SW |
1419 | |
1420 | /* | |
1421 | * vm ops | |
1422 | */ | |
24499847 | 1423 | static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) |
61f68816 | 1424 | { |
11bac800 | 1425 | struct vm_area_struct *vma = vmf->vma; |
61f68816 YZ |
1426 | struct inode *inode = file_inode(vma->vm_file); |
1427 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1428 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1429 | struct page *pinned_page = NULL; |
09cbfeaf | 1430 | loff_t off = vmf->pgoff << PAGE_SHIFT; |
24499847 | 1431 | int want, got, err; |
4f7e89f6 | 1432 | sigset_t oldset; |
24499847 | 1433 | vm_fault_t ret = VM_FAULT_SIGBUS; |
4f7e89f6 YZ |
1434 | |
1435 | ceph_block_sigs(&oldset); | |
61f68816 YZ |
1436 | |
1437 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
09cbfeaf | 1438 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
61f68816 YZ |
1439 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1440 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1441 | else | |
1442 | want = CEPH_CAP_FILE_CACHE; | |
4f7e89f6 YZ |
1443 | |
1444 | got = 0; | |
5e3ded1b YZ |
1445 | err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, |
1446 | &got, &pinned_page); | |
24499847 | 1447 | if (err < 0) |
4f7e89f6 | 1448 | goto out_restore; |
6ce026e4 | 1449 | |
61f68816 | 1450 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
09cbfeaf | 1451 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
61f68816 | 1452 | |
83701246 | 1453 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
2b1ac852 | 1454 | ci->i_inline_version == CEPH_INLINE_NONE) { |
5d988308 YZ |
1455 | CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); |
1456 | ceph_add_rw_context(fi, &rw_ctx); | |
11bac800 | 1457 | ret = filemap_fault(vmf); |
5d988308 | 1458 | ceph_del_rw_context(fi, &rw_ctx); |
24499847 SJ |
1459 | dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", |
1460 | inode, off, (size_t)PAGE_SIZE, | |
1461 | ceph_cap_string(got), ret); | |
2b1ac852 | 1462 | } else |
24499847 | 1463 | err = -EAGAIN; |
61f68816 | 1464 | |
3738daa6 | 1465 | if (pinned_page) |
09cbfeaf | 1466 | put_page(pinned_page); |
61f68816 YZ |
1467 | ceph_put_cap_refs(ci, got); |
1468 | ||
24499847 | 1469 | if (err != -EAGAIN) |
4f7e89f6 | 1470 | goto out_restore; |
83701246 YZ |
1471 | |
1472 | /* read inline data */ | |
09cbfeaf | 1473 | if (off >= PAGE_SIZE) { |
83701246 YZ |
1474 | /* does not support inline data > PAGE_SIZE */ |
1475 | ret = VM_FAULT_SIGBUS; | |
1476 | } else { | |
83701246 YZ |
1477 | struct address_space *mapping = inode->i_mapping; |
1478 | struct page *page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1479 | mapping_gfp_constraint(mapping, |
1480 | ~__GFP_FS)); | |
83701246 YZ |
1481 | if (!page) { |
1482 | ret = VM_FAULT_OOM; | |
4f7e89f6 | 1483 | goto out_inline; |
83701246 | 1484 | } |
24499847 | 1485 | err = __ceph_do_getattr(inode, page, |
83701246 | 1486 | CEPH_STAT_CAP_INLINE_DATA, true); |
24499847 | 1487 | if (err < 0 || off >= i_size_read(inode)) { |
83701246 | 1488 | unlock_page(page); |
09cbfeaf | 1489 | put_page(page); |
c64a2b05 | 1490 | ret = vmf_error(err); |
4f7e89f6 | 1491 | goto out_inline; |
83701246 | 1492 | } |
24499847 SJ |
1493 | if (err < PAGE_SIZE) |
1494 | zero_user_segment(page, err, PAGE_SIZE); | |
83701246 YZ |
1495 | else |
1496 | flush_dcache_page(page); | |
1497 | SetPageUptodate(page); | |
1498 | vmf->page = page; | |
1499 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
4f7e89f6 | 1500 | out_inline: |
24499847 | 1501 | dout("filemap_fault %p %llu~%zd read inline data ret %x\n", |
4f7e89f6 | 1502 | inode, off, (size_t)PAGE_SIZE, ret); |
83701246 | 1503 | } |
4f7e89f6 YZ |
1504 | out_restore: |
1505 | ceph_restore_sigs(&oldset); | |
24499847 SJ |
1506 | if (err < 0) |
1507 | ret = vmf_error(err); | |
6ce026e4 | 1508 | |
61f68816 YZ |
1509 | return ret; |
1510 | } | |
1d3576fd SW |
1511 | |
1512 | /* | |
1513 | * Reuse write_begin here for simplicity. | |
1514 | */ | |
24499847 | 1515 | static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) |
1d3576fd | 1516 | { |
11bac800 | 1517 | struct vm_area_struct *vma = vmf->vma; |
496ad9aa | 1518 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1519 | struct ceph_inode_info *ci = ceph_inode(inode); |
1520 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
f66fd9f0 | 1521 | struct ceph_cap_flush *prealloc_cf; |
61f68816 | 1522 | struct page *page = vmf->page; |
6285bc23 | 1523 | loff_t off = page_offset(page); |
61f68816 YZ |
1524 | loff_t size = i_size_read(inode); |
1525 | size_t len; | |
24499847 | 1526 | int want, got, err; |
4f7e89f6 | 1527 | sigset_t oldset; |
24499847 | 1528 | vm_fault_t ret = VM_FAULT_SIGBUS; |
3ca9c3bd | 1529 | |
f66fd9f0 YZ |
1530 | prealloc_cf = ceph_alloc_cap_flush(); |
1531 | if (!prealloc_cf) | |
6ce026e4 | 1532 | return VM_FAULT_OOM; |
f66fd9f0 | 1533 | |
249c1df5 | 1534 | sb_start_pagefault(inode->i_sb); |
4f7e89f6 | 1535 | ceph_block_sigs(&oldset); |
f66fd9f0 | 1536 | |
28127bdd YZ |
1537 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1538 | struct page *locked_page = NULL; | |
1539 | if (off == 0) { | |
1540 | lock_page(page); | |
1541 | locked_page = page; | |
1542 | } | |
24499847 | 1543 | err = ceph_uninline_data(vma->vm_file, locked_page); |
28127bdd YZ |
1544 | if (locked_page) |
1545 | unlock_page(locked_page); | |
24499847 | 1546 | if (err < 0) |
f66fd9f0 | 1547 | goto out_free; |
28127bdd YZ |
1548 | } |
1549 | ||
09cbfeaf KS |
1550 | if (off + PAGE_SIZE <= size) |
1551 | len = PAGE_SIZE; | |
1d3576fd | 1552 | else |
09cbfeaf | 1553 | len = size & ~PAGE_MASK; |
1d3576fd | 1554 | |
61f68816 YZ |
1555 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1556 | inode, ceph_vinop(inode), off, len, size); | |
1557 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1558 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1559 | else | |
1560 | want = CEPH_CAP_FILE_BUFFER; | |
4f7e89f6 YZ |
1561 | |
1562 | got = 0; | |
5e3ded1b | 1563 | err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, |
4f7e89f6 | 1564 | &got, NULL); |
24499847 | 1565 | if (err < 0) |
4f7e89f6 | 1566 | goto out_free; |
6ce026e4 | 1567 | |
61f68816 YZ |
1568 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
1569 | inode, off, len, ceph_cap_string(got)); | |
1570 | ||
1571 | /* Update time before taking page lock */ | |
1572 | file_update_time(vma->vm_file); | |
5c308356 | 1573 | inode_inc_iversion_raw(inode); |
4af6b225 | 1574 | |
f0b33df5 YZ |
1575 | do { |
1576 | lock_page(page); | |
4af6b225 | 1577 | |
f0b33df5 YZ |
1578 | if ((off > size) || (page->mapping != inode->i_mapping)) { |
1579 | unlock_page(page); | |
1580 | ret = VM_FAULT_NOPAGE; | |
1581 | break; | |
1582 | } | |
1583 | ||
24499847 SJ |
1584 | err = ceph_update_writeable_page(vma->vm_file, off, len, page); |
1585 | if (err >= 0) { | |
f0b33df5 YZ |
1586 | /* success. we'll keep the page locked. */ |
1587 | set_page_dirty(page); | |
1588 | ret = VM_FAULT_LOCKED; | |
1589 | } | |
24499847 | 1590 | } while (err == -EAGAIN); |
4af6b225 | 1591 | |
28127bdd YZ |
1592 | if (ret == VM_FAULT_LOCKED || |
1593 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1594 | int dirty; |
1595 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1596 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1597 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1598 | &prealloc_cf); | |
61f68816 YZ |
1599 | spin_unlock(&ci->i_ceph_lock); |
1600 | if (dirty) | |
1601 | __mark_inode_dirty(inode, dirty); | |
1602 | } | |
1603 | ||
24499847 | 1604 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", |
61f68816 YZ |
1605 | inode, off, len, ceph_cap_string(got), ret); |
1606 | ceph_put_cap_refs(ci, got); | |
f66fd9f0 | 1607 | out_free: |
4f7e89f6 | 1608 | ceph_restore_sigs(&oldset); |
249c1df5 | 1609 | sb_end_pagefault(inode->i_sb); |
f66fd9f0 | 1610 | ceph_free_cap_flush(prealloc_cf); |
24499847 SJ |
1611 | if (err < 0) |
1612 | ret = vmf_error(err); | |
1d3576fd SW |
1613 | return ret; |
1614 | } | |
1615 | ||
31c542a1 YZ |
1616 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1617 | char *data, size_t len) | |
1618 | { | |
1619 | struct address_space *mapping = inode->i_mapping; | |
1620 | struct page *page; | |
1621 | ||
1622 | if (locked_page) { | |
1623 | page = locked_page; | |
1624 | } else { | |
1625 | if (i_size_read(inode) == 0) | |
1626 | return; | |
1627 | page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1628 | mapping_gfp_constraint(mapping, |
1629 | ~__GFP_FS)); | |
31c542a1 YZ |
1630 | if (!page) |
1631 | return; | |
1632 | if (PageUptodate(page)) { | |
1633 | unlock_page(page); | |
09cbfeaf | 1634 | put_page(page); |
31c542a1 YZ |
1635 | return; |
1636 | } | |
1637 | } | |
1638 | ||
0668ff52 | 1639 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1640 | inode, ceph_vinop(inode), len, locked_page); |
1641 | ||
1642 | if (len > 0) { | |
1643 | void *kaddr = kmap_atomic(page); | |
1644 | memcpy(kaddr, data, len); | |
1645 | kunmap_atomic(kaddr); | |
1646 | } | |
1647 | ||
1648 | if (page != locked_page) { | |
09cbfeaf KS |
1649 | if (len < PAGE_SIZE) |
1650 | zero_user_segment(page, len, PAGE_SIZE); | |
31c542a1 YZ |
1651 | else |
1652 | flush_dcache_page(page); | |
1653 | ||
1654 | SetPageUptodate(page); | |
1655 | unlock_page(page); | |
09cbfeaf | 1656 | put_page(page); |
31c542a1 YZ |
1657 | } |
1658 | } | |
1659 | ||
28127bdd YZ |
1660 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1661 | { | |
1662 | struct inode *inode = file_inode(filp); | |
1663 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1664 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1665 | struct ceph_osd_request *req; | |
1666 | struct page *page = NULL; | |
1667 | u64 len, inline_version; | |
1668 | int err = 0; | |
1669 | bool from_pagecache = false; | |
1670 | ||
1671 | spin_lock(&ci->i_ceph_lock); | |
1672 | inline_version = ci->i_inline_version; | |
1673 | spin_unlock(&ci->i_ceph_lock); | |
1674 | ||
1675 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1676 | inode, ceph_vinop(inode), inline_version); | |
1677 | ||
1678 | if (inline_version == 1 || /* initial version, no data */ | |
1679 | inline_version == CEPH_INLINE_NONE) | |
1680 | goto out; | |
1681 | ||
1682 | if (locked_page) { | |
1683 | page = locked_page; | |
1684 | WARN_ON(!PageUptodate(page)); | |
1685 | } else if (ceph_caps_issued(ci) & | |
1686 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1687 | page = find_get_page(inode->i_mapping, 0); | |
1688 | if (page) { | |
1689 | if (PageUptodate(page)) { | |
1690 | from_pagecache = true; | |
1691 | lock_page(page); | |
1692 | } else { | |
09cbfeaf | 1693 | put_page(page); |
28127bdd YZ |
1694 | page = NULL; |
1695 | } | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | if (page) { | |
1700 | len = i_size_read(inode); | |
09cbfeaf KS |
1701 | if (len > PAGE_SIZE) |
1702 | len = PAGE_SIZE; | |
28127bdd YZ |
1703 | } else { |
1704 | page = __page_cache_alloc(GFP_NOFS); | |
1705 | if (!page) { | |
1706 | err = -ENOMEM; | |
1707 | goto out; | |
1708 | } | |
1709 | err = __ceph_do_getattr(inode, page, | |
1710 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1711 | if (err < 0) { | |
1712 | /* no inline data */ | |
1713 | if (err == -ENODATA) | |
1714 | err = 0; | |
1715 | goto out; | |
1716 | } | |
1717 | len = err; | |
1718 | } | |
1719 | ||
1720 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1721 | ceph_vino(inode), 0, &len, 0, 1, | |
54ea0046 | 1722 | CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, |
34b759b4 | 1723 | NULL, 0, 0, false); |
28127bdd YZ |
1724 | if (IS_ERR(req)) { |
1725 | err = PTR_ERR(req); | |
1726 | goto out; | |
1727 | } | |
1728 | ||
fac02ddf | 1729 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1730 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1731 | if (!err) | |
1732 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1733 | ceph_osdc_put_request(req); | |
1734 | if (err < 0) | |
1735 | goto out; | |
1736 | ||
1737 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1738 | ceph_vino(inode), 0, &len, 1, 3, | |
54ea0046 | 1739 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
34b759b4 ID |
1740 | NULL, ci->i_truncate_seq, |
1741 | ci->i_truncate_size, false); | |
28127bdd YZ |
1742 | if (IS_ERR(req)) { |
1743 | err = PTR_ERR(req); | |
1744 | goto out; | |
1745 | } | |
1746 | ||
1747 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1748 | ||
ec137c10 YZ |
1749 | { |
1750 | __le64 xattr_buf = cpu_to_le64(inline_version); | |
1751 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1752 | "inline_version", &xattr_buf, | |
1753 | sizeof(xattr_buf), | |
1754 | CEPH_OSD_CMPXATTR_OP_GT, | |
1755 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1756 | if (err) | |
1757 | goto out_put; | |
1758 | } | |
1759 | ||
1760 | { | |
1761 | char xattr_buf[32]; | |
1762 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), | |
1763 | "%llu", inline_version); | |
1764 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1765 | "inline_version", | |
1766 | xattr_buf, xattr_len, 0, 0); | |
1767 | if (err) | |
1768 | goto out_put; | |
1769 | } | |
28127bdd | 1770 | |
fac02ddf | 1771 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1772 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1773 | if (!err) | |
1774 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1775 | out_put: | |
1776 | ceph_osdc_put_request(req); | |
1777 | if (err == -ECANCELED) | |
1778 | err = 0; | |
1779 | out: | |
1780 | if (page && page != locked_page) { | |
1781 | if (from_pagecache) { | |
1782 | unlock_page(page); | |
09cbfeaf | 1783 | put_page(page); |
28127bdd YZ |
1784 | } else |
1785 | __free_pages(page, 0); | |
1786 | } | |
1787 | ||
1788 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1789 | inode, ceph_vinop(inode), inline_version, err); | |
1790 | return err; | |
1791 | } | |
1792 | ||
7cbea8dc | 1793 | static const struct vm_operations_struct ceph_vmops = { |
61f68816 | 1794 | .fault = ceph_filemap_fault, |
1d3576fd SW |
1795 | .page_mkwrite = ceph_page_mkwrite, |
1796 | }; | |
1797 | ||
1798 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1799 | { | |
1800 | struct address_space *mapping = file->f_mapping; | |
1801 | ||
1802 | if (!mapping->a_ops->readpage) | |
1803 | return -ENOEXEC; | |
1804 | file_accessed(file); | |
1805 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1806 | return 0; |
1807 | } | |
10183a69 YZ |
1808 | |
1809 | enum { | |
1810 | POOL_READ = 1, | |
1811 | POOL_WRITE = 2, | |
1812 | }; | |
1813 | ||
779fe0fb YZ |
1814 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
1815 | s64 pool, struct ceph_string *pool_ns) | |
10183a69 YZ |
1816 | { |
1817 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1818 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1819 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; | |
1820 | struct rb_node **p, *parent; | |
1821 | struct ceph_pool_perm *perm; | |
1822 | struct page **pages; | |
779fe0fb | 1823 | size_t pool_ns_len; |
10183a69 YZ |
1824 | int err = 0, err2 = 0, have = 0; |
1825 | ||
1826 | down_read(&mdsc->pool_perm_rwsem); | |
1827 | p = &mdsc->pool_perm_tree.rb_node; | |
1828 | while (*p) { | |
1829 | perm = rb_entry(*p, struct ceph_pool_perm, node); | |
1830 | if (pool < perm->pool) | |
1831 | p = &(*p)->rb_left; | |
1832 | else if (pool > perm->pool) | |
1833 | p = &(*p)->rb_right; | |
1834 | else { | |
779fe0fb YZ |
1835 | int ret = ceph_compare_string(pool_ns, |
1836 | perm->pool_ns, | |
1837 | perm->pool_ns_len); | |
1838 | if (ret < 0) | |
1839 | p = &(*p)->rb_left; | |
1840 | else if (ret > 0) | |
1841 | p = &(*p)->rb_right; | |
1842 | else { | |
1843 | have = perm->perm; | |
1844 | break; | |
1845 | } | |
10183a69 YZ |
1846 | } |
1847 | } | |
1848 | up_read(&mdsc->pool_perm_rwsem); | |
1849 | if (*p) | |
1850 | goto out; | |
1851 | ||
779fe0fb YZ |
1852 | if (pool_ns) |
1853 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", | |
1854 | pool, (int)pool_ns->len, pool_ns->str); | |
1855 | else | |
1856 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); | |
10183a69 YZ |
1857 | |
1858 | down_write(&mdsc->pool_perm_rwsem); | |
779fe0fb | 1859 | p = &mdsc->pool_perm_tree.rb_node; |
10183a69 YZ |
1860 | parent = NULL; |
1861 | while (*p) { | |
1862 | parent = *p; | |
1863 | perm = rb_entry(parent, struct ceph_pool_perm, node); | |
1864 | if (pool < perm->pool) | |
1865 | p = &(*p)->rb_left; | |
1866 | else if (pool > perm->pool) | |
1867 | p = &(*p)->rb_right; | |
1868 | else { | |
779fe0fb YZ |
1869 | int ret = ceph_compare_string(pool_ns, |
1870 | perm->pool_ns, | |
1871 | perm->pool_ns_len); | |
1872 | if (ret < 0) | |
1873 | p = &(*p)->rb_left; | |
1874 | else if (ret > 0) | |
1875 | p = &(*p)->rb_right; | |
1876 | else { | |
1877 | have = perm->perm; | |
1878 | break; | |
1879 | } | |
10183a69 YZ |
1880 | } |
1881 | } | |
1882 | if (*p) { | |
1883 | up_write(&mdsc->pool_perm_rwsem); | |
1884 | goto out; | |
1885 | } | |
1886 | ||
34b759b4 | 1887 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1888 | 1, false, GFP_NOFS); |
1889 | if (!rd_req) { | |
1890 | err = -ENOMEM; | |
1891 | goto out_unlock; | |
1892 | } | |
1893 | ||
1894 | rd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1895 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); | |
1896 | rd_req->r_base_oloc.pool = pool; | |
779fe0fb YZ |
1897 | if (pool_ns) |
1898 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); | |
d30291b9 | 1899 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
10183a69 | 1900 | |
13d1ad16 ID |
1901 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
1902 | if (err) | |
1903 | goto out_unlock; | |
10183a69 | 1904 | |
34b759b4 | 1905 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1906 | 1, false, GFP_NOFS); |
1907 | if (!wr_req) { | |
1908 | err = -ENOMEM; | |
1909 | goto out_unlock; | |
1910 | } | |
1911 | ||
54ea0046 | 1912 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE; |
10183a69 | 1913 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
63244fa1 | 1914 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
d30291b9 | 1915 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
10183a69 | 1916 | |
13d1ad16 ID |
1917 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
1918 | if (err) | |
1919 | goto out_unlock; | |
10183a69 YZ |
1920 | |
1921 | /* one page should be large enough for STAT data */ | |
1922 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); | |
1923 | if (IS_ERR(pages)) { | |
1924 | err = PTR_ERR(pages); | |
1925 | goto out_unlock; | |
1926 | } | |
1927 | ||
1928 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, | |
1929 | 0, false, true); | |
10183a69 YZ |
1930 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
1931 | ||
fac02ddf | 1932 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
10183a69 YZ |
1933 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
1934 | ||
1935 | if (!err) | |
1936 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); | |
1937 | if (!err2) | |
1938 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); | |
1939 | ||
1940 | if (err >= 0 || err == -ENOENT) | |
1941 | have |= POOL_READ; | |
131d7eb4 YZ |
1942 | else if (err != -EPERM) { |
1943 | if (err == -EBLACKLISTED) | |
1944 | fsc->blacklisted = true; | |
10183a69 | 1945 | goto out_unlock; |
131d7eb4 | 1946 | } |
10183a69 YZ |
1947 | |
1948 | if (err2 == 0 || err2 == -EEXIST) | |
1949 | have |= POOL_WRITE; | |
1950 | else if (err2 != -EPERM) { | |
131d7eb4 YZ |
1951 | if (err2 == -EBLACKLISTED) |
1952 | fsc->blacklisted = true; | |
10183a69 YZ |
1953 | err = err2; |
1954 | goto out_unlock; | |
1955 | } | |
1956 | ||
779fe0fb YZ |
1957 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
1958 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); | |
10183a69 YZ |
1959 | if (!perm) { |
1960 | err = -ENOMEM; | |
1961 | goto out_unlock; | |
1962 | } | |
1963 | ||
1964 | perm->pool = pool; | |
1965 | perm->perm = have; | |
779fe0fb YZ |
1966 | perm->pool_ns_len = pool_ns_len; |
1967 | if (pool_ns_len > 0) | |
1968 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); | |
1969 | perm->pool_ns[pool_ns_len] = 0; | |
1970 | ||
10183a69 YZ |
1971 | rb_link_node(&perm->node, parent, p); |
1972 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); | |
1973 | err = 0; | |
1974 | out_unlock: | |
1975 | up_write(&mdsc->pool_perm_rwsem); | |
1976 | ||
3ed97d63 ID |
1977 | ceph_osdc_put_request(rd_req); |
1978 | ceph_osdc_put_request(wr_req); | |
10183a69 YZ |
1979 | out: |
1980 | if (!err) | |
1981 | err = have; | |
779fe0fb YZ |
1982 | if (pool_ns) |
1983 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", | |
1984 | pool, (int)pool_ns->len, pool_ns->str, err); | |
1985 | else | |
1986 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); | |
10183a69 YZ |
1987 | return err; |
1988 | } | |
1989 | ||
5e3ded1b | 1990 | int ceph_pool_perm_check(struct inode *inode, int need) |
10183a69 | 1991 | { |
5e3ded1b | 1992 | struct ceph_inode_info *ci = ceph_inode(inode); |
779fe0fb | 1993 | struct ceph_string *pool_ns; |
5e3ded1b | 1994 | s64 pool; |
10183a69 YZ |
1995 | int ret, flags; |
1996 | ||
80e80fbb YZ |
1997 | if (ci->i_vino.snap != CEPH_NOSNAP) { |
1998 | /* | |
1999 | * Pool permission check needs to write to the first object. | |
2000 | * But for snapshot, head of the first object may have alread | |
2001 | * been deleted. Skip check to avoid creating orphan object. | |
2002 | */ | |
2003 | return 0; | |
2004 | } | |
2005 | ||
5e3ded1b | 2006 | if (ceph_test_mount_opt(ceph_inode_to_client(inode), |
10183a69 YZ |
2007 | NOPOOLPERM)) |
2008 | return 0; | |
2009 | ||
2010 | spin_lock(&ci->i_ceph_lock); | |
2011 | flags = ci->i_ceph_flags; | |
7627151e | 2012 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2013 | spin_unlock(&ci->i_ceph_lock); |
2014 | check: | |
2015 | if (flags & CEPH_I_POOL_PERM) { | |
2016 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { | |
7627151e | 2017 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
10183a69 YZ |
2018 | pool); |
2019 | return -EPERM; | |
2020 | } | |
2021 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { | |
7627151e | 2022 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
10183a69 YZ |
2023 | pool); |
2024 | return -EPERM; | |
2025 | } | |
2026 | return 0; | |
2027 | } | |
2028 | ||
779fe0fb YZ |
2029 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
2030 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); | |
2031 | ceph_put_string(pool_ns); | |
10183a69 YZ |
2032 | if (ret < 0) |
2033 | return ret; | |
2034 | ||
2035 | flags = CEPH_I_POOL_PERM; | |
2036 | if (ret & POOL_READ) | |
2037 | flags |= CEPH_I_POOL_RD; | |
2038 | if (ret & POOL_WRITE) | |
2039 | flags |= CEPH_I_POOL_WR; | |
2040 | ||
2041 | spin_lock(&ci->i_ceph_lock); | |
779fe0fb YZ |
2042 | if (pool == ci->i_layout.pool_id && |
2043 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { | |
2044 | ci->i_ceph_flags |= flags; | |
10183a69 | 2045 | } else { |
7627151e | 2046 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2047 | flags = ci->i_ceph_flags; |
2048 | } | |
2049 | spin_unlock(&ci->i_ceph_lock); | |
2050 | goto check; | |
2051 | } | |
2052 | ||
2053 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) | |
2054 | { | |
2055 | struct ceph_pool_perm *perm; | |
2056 | struct rb_node *n; | |
2057 | ||
2058 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { | |
2059 | n = rb_first(&mdsc->pool_perm_tree); | |
2060 | perm = rb_entry(n, struct ceph_pool_perm, node); | |
2061 | rb_erase(n, &mdsc->pool_perm_tree); | |
2062 | kfree(perm); | |
2063 | } | |
2064 | } |