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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> |
1d3576fd SW |
13 | |
14 | #include "super.h" | |
3d14c5d2 | 15 | #include "mds_client.h" |
99ccbd22 | 16 | #include "cache.h" |
3d14c5d2 | 17 | #include <linux/ceph/osd_client.h> |
1d3576fd SW |
18 | |
19 | /* | |
20 | * Ceph address space ops. | |
21 | * | |
22 | * There are a few funny things going on here. | |
23 | * | |
24 | * The page->private field is used to reference a struct | |
25 | * ceph_snap_context for _every_ dirty page. This indicates which | |
26 | * snapshot the page was logically dirtied in, and thus which snap | |
27 | * context needs to be associated with the osd write during writeback. | |
28 | * | |
29 | * Similarly, struct ceph_inode_info maintains a set of counters to | |
25985edc | 30 | * count dirty pages on the inode. In the absence of snapshots, |
1d3576fd SW |
31 | * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. |
32 | * | |
33 | * When a snapshot is taken (that is, when the client receives | |
34 | * notification that a snapshot was taken), each inode with caps and | |
35 | * with dirty pages (dirty pages implies there is a cap) gets a new | |
36 | * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending | |
37 | * order, new snaps go to the tail). The i_wrbuffer_ref_head count is | |
38 | * moved to capsnap->dirty. (Unless a sync write is currently in | |
39 | * progress. In that case, the capsnap is said to be "pending", new | |
40 | * writes cannot start, and the capsnap isn't "finalized" until the | |
41 | * write completes (or fails) and a final size/mtime for the inode for | |
42 | * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. | |
43 | * | |
44 | * On writeback, we must submit writes to the osd IN SNAP ORDER. So, | |
45 | * we look for the first capsnap in i_cap_snaps and write out pages in | |
46 | * that snap context _only_. Then we move on to the next capsnap, | |
47 | * eventually reaching the "live" or "head" context (i.e., pages that | |
48 | * are not yet snapped) and are writing the most recently dirtied | |
49 | * pages. | |
50 | * | |
51 | * Invalidate and so forth must take care to ensure the dirty page | |
52 | * accounting is preserved. | |
53 | */ | |
54 | ||
2baba250 YS |
55 | #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) |
56 | #define CONGESTION_OFF_THRESH(congestion_kb) \ | |
57 | (CONGESTION_ON_THRESH(congestion_kb) - \ | |
58 | (CONGESTION_ON_THRESH(congestion_kb) >> 2)) | |
59 | ||
61600ef8 YZ |
60 | static inline struct ceph_snap_context *page_snap_context(struct page *page) |
61 | { | |
62 | if (PagePrivate(page)) | |
63 | return (void *)page->private; | |
64 | return NULL; | |
65 | } | |
1d3576fd SW |
66 | |
67 | /* | |
68 | * Dirty a page. Optimistically adjust accounting, on the assumption | |
69 | * that we won't race with invalidate. If we do, readjust. | |
70 | */ | |
71 | static int ceph_set_page_dirty(struct page *page) | |
72 | { | |
73 | struct address_space *mapping = page->mapping; | |
74 | struct inode *inode; | |
75 | struct ceph_inode_info *ci; | |
1d3576fd | 76 | struct ceph_snap_context *snapc; |
7d6e1f54 | 77 | int ret; |
1d3576fd SW |
78 | |
79 | if (unlikely(!mapping)) | |
80 | return !TestSetPageDirty(page); | |
81 | ||
7d6e1f54 | 82 | if (PageDirty(page)) { |
1d3576fd SW |
83 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
84 | mapping->host, page, page->index); | |
7d6e1f54 | 85 | BUG_ON(!PagePrivate(page)); |
1d3576fd SW |
86 | return 0; |
87 | } | |
88 | ||
89 | inode = mapping->host; | |
90 | ci = ceph_inode(inode); | |
91 | ||
1d3576fd | 92 | /* dirty the head */ |
be655596 | 93 | spin_lock(&ci->i_ceph_lock); |
5dda377c YZ |
94 | BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference |
95 | if (__ceph_have_pending_cap_snap(ci)) { | |
96 | struct ceph_cap_snap *capsnap = | |
97 | list_last_entry(&ci->i_cap_snaps, | |
98 | struct ceph_cap_snap, | |
99 | ci_item); | |
100 | snapc = ceph_get_snap_context(capsnap->context); | |
101 | capsnap->dirty_pages++; | |
102 | } else { | |
103 | BUG_ON(!ci->i_head_snapc); | |
104 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
105 | ++ci->i_wrbuffer_ref_head; | |
106 | } | |
1d3576fd | 107 | if (ci->i_wrbuffer_ref == 0) |
0444d76a | 108 | ihold(inode); |
1d3576fd SW |
109 | ++ci->i_wrbuffer_ref; |
110 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " | |
111 | "snapc %p seq %lld (%d snaps)\n", | |
112 | mapping->host, page, page->index, | |
113 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, | |
114 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
115 | snapc, snapc->seq, snapc->num_snaps); | |
be655596 | 116 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd | 117 | |
7d6e1f54 SZ |
118 | /* |
119 | * Reference snap context in page->private. Also set | |
120 | * PagePrivate so that we get invalidatepage callback. | |
121 | */ | |
122 | BUG_ON(PagePrivate(page)); | |
123 | page->private = (unsigned long)snapc; | |
124 | SetPagePrivate(page); | |
1d3576fd | 125 | |
7d6e1f54 SZ |
126 | ret = __set_page_dirty_nobuffers(page); |
127 | WARN_ON(!PageLocked(page)); | |
128 | WARN_ON(!page->mapping); | |
1d3576fd | 129 | |
7d6e1f54 | 130 | return ret; |
1d3576fd SW |
131 | } |
132 | ||
133 | /* | |
134 | * If we are truncating the full page (i.e. offset == 0), adjust the | |
135 | * dirty page counters appropriately. Only called if there is private | |
136 | * data on the page. | |
137 | */ | |
d47992f8 LC |
138 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
139 | unsigned int length) | |
1d3576fd | 140 | { |
4ce1e9ad | 141 | struct inode *inode; |
1d3576fd | 142 | struct ceph_inode_info *ci; |
61600ef8 | 143 | struct ceph_snap_context *snapc = page_snap_context(page); |
1d3576fd | 144 | |
4ce1e9ad | 145 | inode = page->mapping->host; |
b150f5c1 MT |
146 | ci = ceph_inode(inode); |
147 | ||
09cbfeaf | 148 | if (offset != 0 || length != PAGE_SIZE) { |
b150f5c1 MT |
149 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
150 | inode, page, page->index, offset, length); | |
151 | return; | |
152 | } | |
4ce1e9ad | 153 | |
99ccbd22 MT |
154 | ceph_invalidate_fscache_page(inode, page); |
155 | ||
b072d774 | 156 | WARN_ON(!PageLocked(page)); |
99ccbd22 MT |
157 | if (!PagePrivate(page)) |
158 | return; | |
159 | ||
b150f5c1 | 160 | ClearPageChecked(page); |
1d3576fd | 161 | |
b150f5c1 MT |
162 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
163 | inode, page, page->index); | |
164 | ||
165 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
166 | ceph_put_snap_context(snapc); | |
167 | page->private = 0; | |
168 | ClearPagePrivate(page); | |
1d3576fd SW |
169 | } |
170 | ||
1d3576fd SW |
171 | static int ceph_releasepage(struct page *page, gfp_t g) |
172 | { | |
e55f1a18 N |
173 | dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, |
174 | page, page->index, PageDirty(page) ? "" : "not "); | |
99ccbd22 MT |
175 | |
176 | /* Can we release the page from the cache? */ | |
177 | if (!ceph_release_fscache_page(page, g)) | |
178 | return 0; | |
179 | ||
180 | return !PagePrivate(page); | |
1d3576fd SW |
181 | } |
182 | ||
183 | /* | |
184 | * read a single page, without unlocking it. | |
185 | */ | |
dd2bc473 | 186 | static int ceph_do_readpage(struct file *filp, struct page *page) |
1d3576fd | 187 | { |
496ad9aa | 188 | struct inode *inode = file_inode(filp); |
1d3576fd | 189 | struct ceph_inode_info *ci = ceph_inode(inode); |
99ccbd22 | 190 | struct ceph_osd_client *osdc = |
3d14c5d2 | 191 | &ceph_inode_to_client(inode)->client->osdc; |
1d3576fd | 192 | int err = 0; |
83701246 | 193 | u64 off = page_offset(page); |
09cbfeaf | 194 | u64 len = PAGE_SIZE; |
1d3576fd | 195 | |
83701246 | 196 | if (off >= i_size_read(inode)) { |
09cbfeaf | 197 | zero_user_segment(page, 0, PAGE_SIZE); |
83701246 YZ |
198 | SetPageUptodate(page); |
199 | return 0; | |
200 | } | |
99ccbd22 | 201 | |
fcc02d2a YZ |
202 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
203 | /* | |
204 | * Uptodate inline data should have been added | |
205 | * into page cache while getting Fcr caps. | |
206 | */ | |
207 | if (off == 0) | |
208 | return -EINVAL; | |
09cbfeaf | 209 | zero_user_segment(page, 0, PAGE_SIZE); |
fcc02d2a YZ |
210 | SetPageUptodate(page); |
211 | return 0; | |
212 | } | |
83701246 YZ |
213 | |
214 | err = ceph_readpage_from_fscache(inode, page); | |
99ccbd22 | 215 | if (err == 0) |
dd2bc473 | 216 | return -EINPROGRESS; |
99ccbd22 | 217 | |
1d3576fd SW |
218 | dout("readpage inode %p file %p page %p index %lu\n", |
219 | inode, filp, page, page->index); | |
220 | err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, | |
83701246 | 221 | off, &len, |
1d3576fd | 222 | ci->i_truncate_seq, ci->i_truncate_size, |
b7495fc2 | 223 | &page, 1, 0); |
1d3576fd SW |
224 | if (err == -ENOENT) |
225 | err = 0; | |
226 | if (err < 0) { | |
227 | SetPageError(page); | |
18302805 | 228 | ceph_fscache_readpage_cancel(inode, page); |
1d3576fd | 229 | goto out; |
1d3576fd | 230 | } |
09cbfeaf | 231 | if (err < PAGE_SIZE) |
23cd573b | 232 | /* zero fill remainder of page */ |
09cbfeaf | 233 | zero_user_segment(page, err, PAGE_SIZE); |
23cd573b ZZ |
234 | else |
235 | flush_dcache_page(page); | |
1d3576fd | 236 | |
23cd573b ZZ |
237 | SetPageUptodate(page); |
238 | ceph_readpage_to_fscache(inode, page); | |
99ccbd22 | 239 | |
1d3576fd SW |
240 | out: |
241 | return err < 0 ? err : 0; | |
242 | } | |
243 | ||
244 | static int ceph_readpage(struct file *filp, struct page *page) | |
245 | { | |
dd2bc473 YZ |
246 | int r = ceph_do_readpage(filp, page); |
247 | if (r != -EINPROGRESS) | |
248 | unlock_page(page); | |
249 | else | |
250 | r = 0; | |
1d3576fd SW |
251 | return r; |
252 | } | |
253 | ||
254 | /* | |
7c272194 | 255 | * Finish an async read(ahead) op. |
1d3576fd | 256 | */ |
85e084fe | 257 | static void finish_read(struct ceph_osd_request *req) |
1d3576fd | 258 | { |
7c272194 | 259 | struct inode *inode = req->r_inode; |
87060c10 | 260 | struct ceph_osd_data *osd_data; |
85e084fe ID |
261 | int rc = req->r_result <= 0 ? req->r_result : 0; |
262 | int bytes = req->r_result >= 0 ? req->r_result : 0; | |
e0c59487 | 263 | int num_pages; |
7c272194 | 264 | int i; |
1d3576fd | 265 | |
7c272194 SW |
266 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
267 | ||
268 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 269 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
270 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
271 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
272 | (u64)osd_data->length); | |
e0c59487 | 273 | for (i = 0; i < num_pages; i++) { |
87060c10 | 274 | struct page *page = osd_data->pages[i]; |
7c272194 | 275 | |
368e3585 YZ |
276 | if (rc < 0 && rc != -ENOENT) { |
277 | ceph_fscache_readpage_cancel(inode, page); | |
f36132a7 | 278 | goto unlock; |
368e3585 | 279 | } |
09cbfeaf | 280 | if (bytes < (int)PAGE_SIZE) { |
7c272194 SW |
281 | /* zero (remainder of) page */ |
282 | int s = bytes < 0 ? 0 : bytes; | |
09cbfeaf | 283 | zero_user_segment(page, s, PAGE_SIZE); |
1d3576fd | 284 | } |
7c272194 SW |
285 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
286 | page->index); | |
287 | flush_dcache_page(page); | |
288 | SetPageUptodate(page); | |
99ccbd22 | 289 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 290 | unlock: |
7c272194 | 291 | unlock_page(page); |
09cbfeaf KS |
292 | put_page(page); |
293 | bytes -= PAGE_SIZE; | |
1d3576fd | 294 | } |
87060c10 | 295 | kfree(osd_data->pages); |
1d3576fd SW |
296 | } |
297 | ||
298 | /* | |
7c272194 SW |
299 | * start an async read(ahead) operation. return nr_pages we submitted |
300 | * a read for on success, or negative error code. | |
1d3576fd | 301 | */ |
0d66a487 | 302 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
1d3576fd | 303 | { |
3d14c5d2 YS |
304 | struct ceph_osd_client *osdc = |
305 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 SW |
306 | struct ceph_inode_info *ci = ceph_inode(inode); |
307 | struct page *page = list_entry(page_list->prev, struct page, lru); | |
acead002 | 308 | struct ceph_vino vino; |
7c272194 SW |
309 | struct ceph_osd_request *req; |
310 | u64 off; | |
1d3576fd | 311 | u64 len; |
7c272194 SW |
312 | int i; |
313 | struct page **pages; | |
314 | pgoff_t next_index; | |
315 | int nr_pages = 0; | |
2b1ac852 YZ |
316 | int got = 0; |
317 | int ret = 0; | |
318 | ||
319 | if (!current->journal_info) { | |
320 | /* caller of readpages does not hold buffer and read caps | |
321 | * (fadvise, madvise and readahead cases) */ | |
322 | int want = CEPH_CAP_FILE_CACHE; | |
323 | ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); | |
324 | if (ret < 0) { | |
325 | dout("start_read %p, error getting cap\n", inode); | |
326 | } else if (!(got & want)) { | |
327 | dout("start_read %p, no cache cap\n", inode); | |
328 | ret = 0; | |
329 | } | |
330 | if (ret <= 0) { | |
331 | if (got) | |
332 | ceph_put_cap_refs(ci, got); | |
333 | while (!list_empty(page_list)) { | |
334 | page = list_entry(page_list->prev, | |
335 | struct page, lru); | |
336 | list_del(&page->lru); | |
337 | put_page(page); | |
338 | } | |
339 | return ret; | |
340 | } | |
341 | } | |
1d3576fd | 342 | |
6285bc23 | 343 | off = (u64) page_offset(page); |
1d3576fd | 344 | |
7c272194 SW |
345 | /* count pages */ |
346 | next_index = page->index; | |
347 | list_for_each_entry_reverse(page, page_list, lru) { | |
348 | if (page->index != next_index) | |
349 | break; | |
350 | nr_pages++; | |
351 | next_index++; | |
0d66a487 SW |
352 | if (max && nr_pages == max) |
353 | break; | |
7c272194 | 354 | } |
09cbfeaf | 355 | len = nr_pages << PAGE_SHIFT; |
7c272194 SW |
356 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
357 | off, len); | |
acead002 AE |
358 | vino = ceph_vino(inode); |
359 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 360 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 361 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 362 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 363 | false); |
2b1ac852 YZ |
364 | if (IS_ERR(req)) { |
365 | ret = PTR_ERR(req); | |
366 | goto out; | |
367 | } | |
1d3576fd | 368 | |
7c272194 | 369 | /* build page vector */ |
cf7b7e14 | 370 | nr_pages = calc_pages_for(0, len); |
687265e5 | 371 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); |
2b1ac852 YZ |
372 | if (!pages) { |
373 | ret = -ENOMEM; | |
374 | goto out_put; | |
375 | } | |
7c272194 SW |
376 | for (i = 0; i < nr_pages; ++i) { |
377 | page = list_entry(page_list->prev, struct page, lru); | |
378 | BUG_ON(PageLocked(page)); | |
1d3576fd | 379 | list_del(&page->lru); |
99ccbd22 | 380 | |
7c272194 SW |
381 | dout("start_read %p adding %p idx %lu\n", inode, page, |
382 | page->index); | |
383 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
687265e5 | 384 | GFP_KERNEL)) { |
d4d3aa38 | 385 | ceph_fscache_uncache_page(inode, page); |
09cbfeaf | 386 | put_page(page); |
7c272194 | 387 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 388 | inode, page); |
7c272194 | 389 | nr_pages = i; |
1afe4785 YZ |
390 | if (nr_pages > 0) { |
391 | len = nr_pages << PAGE_SHIFT; | |
d641df81 | 392 | osd_req_op_extent_update(req, 0, len); |
1afe4785 YZ |
393 | break; |
394 | } | |
7c272194 | 395 | goto out_pages; |
1d3576fd | 396 | } |
7c272194 | 397 | pages[i] = page; |
1d3576fd | 398 | } |
406e2c9f | 399 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
400 | req->r_callback = finish_read; |
401 | req->r_inode = inode; | |
402 | ||
403 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); | |
404 | ret = ceph_osdc_start_request(osdc, req, false); | |
405 | if (ret < 0) | |
406 | goto out_pages; | |
407 | ceph_osdc_put_request(req); | |
2b1ac852 YZ |
408 | |
409 | /* After adding locked pages to page cache, the inode holds cache cap. | |
410 | * So we can drop our cap refs. */ | |
411 | if (got) | |
412 | ceph_put_cap_refs(ci, got); | |
413 | ||
7c272194 SW |
414 | return nr_pages; |
415 | ||
416 | out_pages: | |
1afe4785 YZ |
417 | for (i = 0; i < nr_pages; ++i) { |
418 | ceph_fscache_readpage_cancel(inode, pages[i]); | |
419 | unlock_page(pages[i]); | |
420 | } | |
421 | ceph_put_page_vector(pages, nr_pages, false); | |
2b1ac852 | 422 | out_put: |
7c272194 | 423 | ceph_osdc_put_request(req); |
2b1ac852 YZ |
424 | out: |
425 | if (got) | |
426 | ceph_put_cap_refs(ci, got); | |
7c272194 SW |
427 | return ret; |
428 | } | |
1d3576fd | 429 | |
7c272194 SW |
430 | |
431 | /* | |
432 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
433 | * the caller (VM) cleans them up. | |
434 | */ | |
435 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
436 | struct list_head *page_list, unsigned nr_pages) | |
437 | { | |
496ad9aa | 438 | struct inode *inode = file_inode(file); |
0d66a487 | 439 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
7c272194 | 440 | int rc = 0; |
0d66a487 SW |
441 | int max = 0; |
442 | ||
83701246 YZ |
443 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
444 | return -EINVAL; | |
445 | ||
99ccbd22 MT |
446 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
447 | &nr_pages); | |
448 | ||
449 | if (rc == 0) | |
450 | goto out; | |
451 | ||
aa187926 YZ |
452 | max = fsc->mount_options->rsize >> PAGE_SHIFT; |
453 | dout("readpages %p file %p nr_pages %d max %d\n", | |
454 | inode, file, nr_pages, max); | |
7c272194 | 455 | while (!list_empty(page_list)) { |
0d66a487 | 456 | rc = start_read(inode, page_list, max); |
7c272194 SW |
457 | if (rc < 0) |
458 | goto out; | |
7c272194 | 459 | } |
1d3576fd | 460 | out: |
76be778b MT |
461 | ceph_fscache_readpages_cancel(inode, page_list); |
462 | ||
7c272194 | 463 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
464 | return rc; |
465 | } | |
466 | ||
1f934b00 YZ |
467 | struct ceph_writeback_ctl |
468 | { | |
469 | loff_t i_size; | |
470 | u64 truncate_size; | |
471 | u32 truncate_seq; | |
472 | bool size_stable; | |
2a2d927e | 473 | bool head_snapc; |
1f934b00 YZ |
474 | }; |
475 | ||
1d3576fd SW |
476 | /* |
477 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
478 | * only snap context we are allowed to write back. | |
1d3576fd | 479 | */ |
1f934b00 | 480 | static struct ceph_snap_context * |
05455e11 YZ |
481 | get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, |
482 | struct ceph_snap_context *page_snapc) | |
1d3576fd SW |
483 | { |
484 | struct ceph_inode_info *ci = ceph_inode(inode); | |
485 | struct ceph_snap_context *snapc = NULL; | |
486 | struct ceph_cap_snap *capsnap = NULL; | |
487 | ||
be655596 | 488 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
489 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
490 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
491 | capsnap->context, capsnap->dirty_pages); | |
05455e11 YZ |
492 | if (!capsnap->dirty_pages) |
493 | continue; | |
494 | ||
495 | /* get i_size, truncate_{seq,size} for page_snapc? */ | |
496 | if (snapc && capsnap->context != page_snapc) | |
497 | continue; | |
498 | ||
499 | if (ctl) { | |
500 | if (capsnap->writing) { | |
501 | ctl->i_size = i_size_read(inode); | |
502 | ctl->size_stable = false; | |
503 | } else { | |
504 | ctl->i_size = capsnap->size; | |
505 | ctl->size_stable = true; | |
1f934b00 | 506 | } |
05455e11 YZ |
507 | ctl->truncate_size = capsnap->truncate_size; |
508 | ctl->truncate_seq = capsnap->truncate_seq; | |
2a2d927e | 509 | ctl->head_snapc = false; |
1d3576fd | 510 | } |
05455e11 YZ |
511 | |
512 | if (snapc) | |
513 | break; | |
514 | ||
515 | snapc = ceph_get_snap_context(capsnap->context); | |
516 | if (!page_snapc || | |
517 | page_snapc == snapc || | |
518 | page_snapc->seq > snapc->seq) | |
519 | break; | |
1d3576fd | 520 | } |
7d8cb26d | 521 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 522 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
523 | dout(" head snapc %p has %d dirty pages\n", |
524 | snapc, ci->i_wrbuffer_ref_head); | |
1f934b00 YZ |
525 | if (ctl) { |
526 | ctl->i_size = i_size_read(inode); | |
527 | ctl->truncate_size = ci->i_truncate_size; | |
528 | ctl->truncate_seq = ci->i_truncate_seq; | |
529 | ctl->size_stable = false; | |
2a2d927e | 530 | ctl->head_snapc = true; |
1f934b00 | 531 | } |
1d3576fd | 532 | } |
be655596 | 533 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
534 | return snapc; |
535 | } | |
536 | ||
1f934b00 YZ |
537 | static u64 get_writepages_data_length(struct inode *inode, |
538 | struct page *page, u64 start) | |
539 | { | |
540 | struct ceph_inode_info *ci = ceph_inode(inode); | |
541 | struct ceph_snap_context *snapc = page_snap_context(page); | |
542 | struct ceph_cap_snap *capsnap = NULL; | |
543 | u64 end = i_size_read(inode); | |
544 | ||
545 | if (snapc != ci->i_head_snapc) { | |
546 | bool found = false; | |
547 | spin_lock(&ci->i_ceph_lock); | |
548 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
549 | if (capsnap->context == snapc) { | |
550 | if (!capsnap->writing) | |
551 | end = capsnap->size; | |
552 | found = true; | |
553 | break; | |
554 | } | |
555 | } | |
556 | spin_unlock(&ci->i_ceph_lock); | |
557 | WARN_ON(!found); | |
558 | } | |
559 | if (end > page_offset(page) + PAGE_SIZE) | |
560 | end = page_offset(page) + PAGE_SIZE; | |
561 | return end > start ? end - start : 0; | |
562 | } | |
563 | ||
1d3576fd SW |
564 | /* |
565 | * Write a single page, but leave the page locked. | |
566 | * | |
567 | * If we get a write error, set the page error bit, but still adjust the | |
568 | * dirty page accounting (i.e., page is no longer dirty). | |
569 | */ | |
570 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
571 | { | |
572 | struct inode *inode; | |
573 | struct ceph_inode_info *ci; | |
3d14c5d2 | 574 | struct ceph_fs_client *fsc; |
6298a337 | 575 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 576 | loff_t page_off = page_offset(page); |
2baba250 | 577 | long writeback_stat; |
43986881 | 578 | int err, len = PAGE_SIZE; |
1f934b00 | 579 | struct ceph_writeback_ctl ceph_wbc; |
1d3576fd SW |
580 | |
581 | dout("writepage %p idx %lu\n", page, page->index); | |
582 | ||
1d3576fd SW |
583 | inode = page->mapping->host; |
584 | ci = ceph_inode(inode); | |
3d14c5d2 | 585 | fsc = ceph_inode_to_client(inode); |
1d3576fd SW |
586 | |
587 | /* verify this is a writeable snap context */ | |
61600ef8 | 588 | snapc = page_snap_context(page); |
d37b1d99 | 589 | if (!snapc) { |
1d3576fd | 590 | dout("writepage %p page %p not dirty?\n", inode, page); |
43986881 | 591 | return 0; |
1d3576fd | 592 | } |
05455e11 | 593 | oldest = get_oldest_context(inode, &ceph_wbc, snapc); |
6298a337 | 594 | if (snapc->seq > oldest->seq) { |
1d3576fd | 595 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 596 | inode, page, snapc); |
1d3576fd | 597 | /* we should only noop if called by kswapd */ |
fa71fefb | 598 | WARN_ON(!(current->flags & PF_MEMALLOC)); |
6298a337 | 599 | ceph_put_snap_context(oldest); |
fa71fefb | 600 | redirty_page_for_writepage(wbc, page); |
43986881 | 601 | return 0; |
1d3576fd | 602 | } |
6298a337 | 603 | ceph_put_snap_context(oldest); |
1d3576fd SW |
604 | |
605 | /* is this a partial page at end of file? */ | |
1f934b00 YZ |
606 | if (page_off >= ceph_wbc.i_size) { |
607 | dout("%p page eof %llu\n", page, ceph_wbc.i_size); | |
05455e11 | 608 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
43986881 | 609 | return 0; |
fc2744aa | 610 | } |
43986881 | 611 | |
1f934b00 YZ |
612 | if (ceph_wbc.i_size < page_off + len) |
613 | len = ceph_wbc.i_size - page_off; | |
1d3576fd | 614 | |
1c0a9c2d YZ |
615 | dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", |
616 | inode, page, page->index, page_off, len, snapc, snapc->seq); | |
1d3576fd | 617 | |
3d14c5d2 | 618 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
2baba250 | 619 | if (writeback_stat > |
3d14c5d2 | 620 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
09dc9fc2 | 621 | set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
2baba250 | 622 | |
1d3576fd | 623 | set_page_writeback(page); |
1f934b00 YZ |
624 | err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), |
625 | &ci->i_layout, snapc, page_off, len, | |
626 | ceph_wbc.truncate_seq, | |
627 | ceph_wbc.truncate_size, | |
24808826 | 628 | &inode->i_mtime, &page, 1); |
1d3576fd | 629 | if (err < 0) { |
ad15ec06 YZ |
630 | struct writeback_control tmp_wbc; |
631 | if (!wbc) | |
632 | wbc = &tmp_wbc; | |
633 | if (err == -ERESTARTSYS) { | |
634 | /* killed by SIGKILL */ | |
635 | dout("writepage interrupted page %p\n", page); | |
636 | redirty_page_for_writepage(wbc, page); | |
637 | end_page_writeback(page); | |
43986881 | 638 | return err; |
ad15ec06 YZ |
639 | } |
640 | dout("writepage setting page/mapping error %d %p\n", | |
641 | err, page); | |
1d3576fd SW |
642 | SetPageError(page); |
643 | mapping_set_error(&inode->i_data, err); | |
ad15ec06 | 644 | wbc->pages_skipped++; |
1d3576fd SW |
645 | } else { |
646 | dout("writepage cleaned page %p\n", page); | |
647 | err = 0; /* vfs expects us to return 0 */ | |
648 | } | |
649 | page->private = 0; | |
650 | ClearPagePrivate(page); | |
651 | end_page_writeback(page); | |
652 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 653 | ceph_put_snap_context(snapc); /* page's reference */ |
1d3576fd SW |
654 | return err; |
655 | } | |
656 | ||
657 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
658 | { | |
dbd646a8 YS |
659 | int err; |
660 | struct inode *inode = page->mapping->host; | |
661 | BUG_ON(!inode); | |
70b666c3 | 662 | ihold(inode); |
dbd646a8 | 663 | err = writepage_nounlock(page, wbc); |
ad15ec06 YZ |
664 | if (err == -ERESTARTSYS) { |
665 | /* direct memory reclaimer was killed by SIGKILL. return 0 | |
666 | * to prevent caller from setting mapping/page error */ | |
667 | err = 0; | |
668 | } | |
1d3576fd | 669 | unlock_page(page); |
dbd646a8 | 670 | iput(inode); |
1d3576fd SW |
671 | return err; |
672 | } | |
673 | ||
1d3576fd SW |
674 | /* |
675 | * lame release_pages helper. release_pages() isn't exported to | |
676 | * modules. | |
677 | */ | |
678 | static void ceph_release_pages(struct page **pages, int num) | |
679 | { | |
680 | struct pagevec pvec; | |
681 | int i; | |
682 | ||
683 | pagevec_init(&pvec, 0); | |
684 | for (i = 0; i < num; i++) { | |
685 | if (pagevec_add(&pvec, pages[i]) == 0) | |
686 | pagevec_release(&pvec); | |
687 | } | |
688 | pagevec_release(&pvec); | |
689 | } | |
690 | ||
1d3576fd SW |
691 | /* |
692 | * async writeback completion handler. | |
693 | * | |
694 | * If we get an error, set the mapping error bit, but not the individual | |
695 | * page error bits. | |
696 | */ | |
85e084fe | 697 | static void writepages_finish(struct ceph_osd_request *req) |
1d3576fd SW |
698 | { |
699 | struct inode *inode = req->r_inode; | |
1d3576fd | 700 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 701 | struct ceph_osd_data *osd_data; |
1d3576fd | 702 | struct page *page; |
5b64640c YZ |
703 | int num_pages, total_pages = 0; |
704 | int i, j; | |
705 | int rc = req->r_result; | |
1d3576fd SW |
706 | struct ceph_snap_context *snapc = req->r_snapc; |
707 | struct address_space *mapping = inode->i_mapping; | |
3d14c5d2 | 708 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
5b64640c | 709 | bool remove_page; |
1d3576fd | 710 | |
5b64640c | 711 | dout("writepages_finish %p rc %d\n", inode, rc); |
26544c62 | 712 | if (rc < 0) { |
1d3576fd | 713 | mapping_set_error(mapping, rc); |
26544c62 JL |
714 | ceph_set_error_write(ci); |
715 | } else { | |
716 | ceph_clear_error_write(ci); | |
717 | } | |
5b64640c YZ |
718 | |
719 | /* | |
720 | * We lost the cache cap, need to truncate the page before | |
721 | * it is unlocked, otherwise we'd truncate it later in the | |
722 | * page truncation thread, possibly losing some data that | |
723 | * raced its way in | |
724 | */ | |
725 | remove_page = !(ceph_caps_issued(ci) & | |
726 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); | |
1d3576fd SW |
727 | |
728 | /* clean all pages */ | |
5b64640c YZ |
729 | for (i = 0; i < req->r_num_ops; i++) { |
730 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) | |
731 | break; | |
e63dc5c7 | 732 | |
5b64640c YZ |
733 | osd_data = osd_req_op_extent_osd_data(req, i); |
734 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); | |
735 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
736 | (u64)osd_data->length); | |
737 | total_pages += num_pages; | |
738 | for (j = 0; j < num_pages; j++) { | |
739 | page = osd_data->pages[j]; | |
740 | BUG_ON(!page); | |
741 | WARN_ON(!PageUptodate(page)); | |
742 | ||
743 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
744 | CONGESTION_OFF_THRESH( | |
745 | fsc->mount_options->congestion_kb)) | |
09dc9fc2 | 746 | clear_bdi_congested(inode_to_bdi(inode), |
5b64640c YZ |
747 | BLK_RW_ASYNC); |
748 | ||
749 | ceph_put_snap_context(page_snap_context(page)); | |
750 | page->private = 0; | |
751 | ClearPagePrivate(page); | |
752 | dout("unlocking %p\n", page); | |
753 | end_page_writeback(page); | |
754 | ||
755 | if (remove_page) | |
756 | generic_error_remove_page(inode->i_mapping, | |
757 | page); | |
758 | ||
759 | unlock_page(page); | |
760 | } | |
761 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", | |
762 | inode, osd_data->length, rc >= 0 ? num_pages : 0); | |
e63dc5c7 | 763 | |
5b64640c | 764 | ceph_release_pages(osd_data->pages, num_pages); |
1d3576fd | 765 | } |
1d3576fd | 766 | |
5b64640c YZ |
767 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
768 | ||
769 | osd_data = osd_req_op_extent_osd_data(req, 0); | |
87060c10 AE |
770 | if (osd_data->pages_from_pool) |
771 | mempool_free(osd_data->pages, | |
640ef79d | 772 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
1d3576fd | 773 | else |
87060c10 | 774 | kfree(osd_data->pages); |
1d3576fd SW |
775 | ceph_osdc_put_request(req); |
776 | } | |
777 | ||
1d3576fd SW |
778 | /* |
779 | * initiate async writeback | |
780 | */ | |
781 | static int ceph_writepages_start(struct address_space *mapping, | |
782 | struct writeback_control *wbc) | |
783 | { | |
784 | struct inode *inode = mapping->host; | |
1d3576fd | 785 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
786 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
787 | struct ceph_vino vino = ceph_vino(inode); | |
2a2d927e | 788 | pgoff_t index, start_index, end = -1; |
80e755fe | 789 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd | 790 | struct pagevec pvec; |
1d3576fd | 791 | int rc = 0; |
93407472 | 792 | unsigned int wsize = i_blocksize(inode); |
1d3576fd | 793 | struct ceph_osd_request *req = NULL; |
1f934b00 | 794 | struct ceph_writeback_ctl ceph_wbc; |
590e9d98 YZ |
795 | bool should_loop, range_whole = false; |
796 | bool stop, done = false; | |
1d3576fd | 797 | |
3fb99d48 | 798 | dout("writepages_start %p (mode=%s)\n", inode, |
1d3576fd SW |
799 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : |
800 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
801 | ||
52953d55 | 802 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
803 | if (ci->i_wrbuffer_ref > 0) { |
804 | pr_warn_ratelimited( | |
805 | "writepage_start %p %lld forced umount\n", | |
806 | inode, ceph_ino(inode)); | |
807 | } | |
a341d4df | 808 | mapping_set_error(mapping, -EIO); |
1d3576fd SW |
809 | return -EIO; /* we're in a forced umount, don't write! */ |
810 | } | |
95cca2b4 | 811 | if (fsc->mount_options->wsize < wsize) |
3d14c5d2 | 812 | wsize = fsc->mount_options->wsize; |
1d3576fd SW |
813 | |
814 | pagevec_init(&pvec, 0); | |
815 | ||
590e9d98 | 816 | start_index = wbc->range_cyclic ? mapping->writeback_index : 0; |
2a2d927e | 817 | index = start_index; |
1d3576fd SW |
818 | |
819 | retry: | |
820 | /* find oldest snap context with dirty data */ | |
05455e11 | 821 | snapc = get_oldest_context(inode, &ceph_wbc, NULL); |
1d3576fd SW |
822 | if (!snapc) { |
823 | /* hmm, why does writepages get called when there | |
824 | is no dirty data? */ | |
825 | dout(" no snap context with dirty data?\n"); | |
826 | goto out; | |
827 | } | |
828 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", | |
829 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa | 830 | |
2a2d927e YZ |
831 | should_loop = false; |
832 | if (ceph_wbc.head_snapc && snapc != last_snapc) { | |
833 | /* where to start/end? */ | |
834 | if (wbc->range_cyclic) { | |
835 | index = start_index; | |
836 | end = -1; | |
837 | if (index > 0) | |
838 | should_loop = true; | |
839 | dout(" cyclic, start at %lu\n", index); | |
840 | } else { | |
841 | index = wbc->range_start >> PAGE_SHIFT; | |
842 | end = wbc->range_end >> PAGE_SHIFT; | |
843 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
844 | range_whole = true; | |
845 | dout(" not cyclic, %lu to %lu\n", index, end); | |
846 | } | |
847 | } else if (!ceph_wbc.head_snapc) { | |
848 | /* Do not respect wbc->range_{start,end}. Dirty pages | |
849 | * in that range can be associated with newer snapc. | |
850 | * They are not writeable until we write all dirty pages | |
851 | * associated with 'snapc' get written */ | |
852 | if (index > 0 || wbc->sync_mode != WB_SYNC_NONE) | |
853 | should_loop = true; | |
854 | dout(" non-head snapc, range whole\n"); | |
1d3576fd | 855 | } |
2a2d927e YZ |
856 | |
857 | ceph_put_snap_context(last_snapc); | |
1d3576fd SW |
858 | last_snapc = snapc; |
859 | ||
590e9d98 YZ |
860 | stop = false; |
861 | while (!stop && index <= end) { | |
5b64640c | 862 | int num_ops = 0, op_idx; |
0e5ecac7 | 863 | unsigned i, pvec_pages, max_pages, locked_pages = 0; |
5b64640c | 864 | struct page **pages = NULL, **data_pages; |
e5975c7c | 865 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
1d3576fd | 866 | struct page *page; |
0e5ecac7 | 867 | pgoff_t strip_unit_end = 0; |
5b64640c | 868 | u64 offset = 0, len = 0; |
1d3576fd | 869 | |
0e5ecac7 | 870 | max_pages = wsize >> PAGE_SHIFT; |
1d3576fd SW |
871 | |
872 | get_more_pages: | |
0e5ecac7 YZ |
873 | pvec_pages = min_t(unsigned, PAGEVEC_SIZE, |
874 | max_pages - locked_pages); | |
875 | if (end - index < (u64)(pvec_pages - 1)) | |
876 | pvec_pages = (unsigned)(end - index) + 1; | |
877 | ||
1d3576fd SW |
878 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
879 | PAGECACHE_TAG_DIRTY, | |
0e5ecac7 | 880 | pvec_pages); |
1d3576fd SW |
881 | dout("pagevec_lookup_tag got %d\n", pvec_pages); |
882 | if (!pvec_pages && !locked_pages) | |
883 | break; | |
884 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
885 | page = pvec.pages[i]; | |
886 | dout("? %p idx %lu\n", page, page->index); | |
887 | if (locked_pages == 0) | |
888 | lock_page(page); /* first page */ | |
889 | else if (!trylock_page(page)) | |
890 | break; | |
891 | ||
892 | /* only dirty pages, or our accounting breaks */ | |
893 | if (unlikely(!PageDirty(page)) || | |
894 | unlikely(page->mapping != mapping)) { | |
895 | dout("!dirty or !mapping %p\n", page); | |
896 | unlock_page(page); | |
0713e5f2 | 897 | continue; |
1d3576fd | 898 | } |
590e9d98 | 899 | if (page->index > end) { |
1d3576fd | 900 | dout("end of range %p\n", page); |
590e9d98 YZ |
901 | /* can't be range_cyclic (1st pass) because |
902 | * end == -1 in that case. */ | |
2a2d927e YZ |
903 | stop = true; |
904 | if (ceph_wbc.head_snapc) | |
905 | done = true; | |
1d3576fd SW |
906 | unlock_page(page); |
907 | break; | |
908 | } | |
5b64640c YZ |
909 | if (strip_unit_end && (page->index > strip_unit_end)) { |
910 | dout("end of strip unit %p\n", page); | |
1d3576fd SW |
911 | unlock_page(page); |
912 | break; | |
913 | } | |
1f934b00 YZ |
914 | if (page_offset(page) >= ceph_wbc.i_size) { |
915 | dout("%p page eof %llu\n", | |
916 | page, ceph_wbc.i_size); | |
590e9d98 YZ |
917 | /* not done if range_cyclic */ |
918 | stop = true; | |
1d3576fd SW |
919 | unlock_page(page); |
920 | break; | |
921 | } | |
922 | if (PageWriteback(page)) { | |
0713e5f2 YZ |
923 | if (wbc->sync_mode == WB_SYNC_NONE) { |
924 | dout("%p under writeback\n", page); | |
925 | unlock_page(page); | |
926 | continue; | |
927 | } | |
928 | dout("waiting on writeback %p\n", page); | |
929 | wait_on_page_writeback(page); | |
1d3576fd SW |
930 | } |
931 | ||
932 | /* only if matching snap context */ | |
61600ef8 | 933 | pgsnapc = page_snap_context(page); |
7e1ee54a YZ |
934 | if (pgsnapc != snapc) { |
935 | dout("page snapc %p %lld != oldest %p %lld\n", | |
80e755fe | 936 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); |
1d3576fd | 937 | unlock_page(page); |
0713e5f2 | 938 | continue; |
1d3576fd SW |
939 | } |
940 | ||
941 | if (!clear_page_dirty_for_io(page)) { | |
942 | dout("%p !clear_page_dirty_for_io\n", page); | |
943 | unlock_page(page); | |
0713e5f2 | 944 | continue; |
1d3576fd SW |
945 | } |
946 | ||
e5975c7c AE |
947 | /* |
948 | * We have something to write. If this is | |
949 | * the first locked page this time through, | |
5b64640c YZ |
950 | * calculate max possinle write size and |
951 | * allocate a page array | |
e5975c7c | 952 | */ |
1d3576fd | 953 | if (locked_pages == 0) { |
5b64640c YZ |
954 | u64 objnum; |
955 | u64 objoff; | |
956 | ||
1d3576fd | 957 | /* prepare async write request */ |
e5975c7c | 958 | offset = (u64)page_offset(page); |
1d3576fd | 959 | len = wsize; |
5b64640c YZ |
960 | |
961 | rc = ceph_calc_file_object_mapping(&ci->i_layout, | |
962 | offset, len, | |
963 | &objnum, &objoff, | |
964 | &len); | |
965 | if (rc < 0) { | |
8c71897b HC |
966 | unlock_page(page); |
967 | break; | |
968 | } | |
969 | ||
3fb99d48 | 970 | num_ops = 1; |
5b64640c | 971 | strip_unit_end = page->index + |
09cbfeaf | 972 | ((len - 1) >> PAGE_SHIFT); |
88486957 | 973 | |
5b64640c | 974 | BUG_ON(pages); |
88486957 | 975 | max_pages = calc_pages_for(0, (u64)len); |
fc2744aa YZ |
976 | pages = kmalloc(max_pages * sizeof (*pages), |
977 | GFP_NOFS); | |
88486957 AE |
978 | if (!pages) { |
979 | pool = fsc->wb_pagevec_pool; | |
88486957 | 980 | pages = mempool_alloc(pool, GFP_NOFS); |
e5975c7c | 981 | BUG_ON(!pages); |
88486957 | 982 | } |
5b64640c YZ |
983 | |
984 | len = 0; | |
985 | } else if (page->index != | |
09cbfeaf | 986 | (offset + len) >> PAGE_SHIFT) { |
5b64640c YZ |
987 | if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : |
988 | CEPH_OSD_MAX_OPS)) { | |
989 | redirty_page_for_writepage(wbc, page); | |
990 | unlock_page(page); | |
991 | break; | |
992 | } | |
993 | ||
994 | num_ops++; | |
995 | offset = (u64)page_offset(page); | |
996 | len = 0; | |
1d3576fd SW |
997 | } |
998 | ||
999 | /* note position of first page in pvec */ | |
1d3576fd SW |
1000 | dout("%p will write page %p idx %lu\n", |
1001 | inode, page, page->index); | |
2baba250 | 1002 | |
5b64640c YZ |
1003 | if (atomic_long_inc_return(&fsc->writeback_count) > |
1004 | CONGESTION_ON_THRESH( | |
3d14c5d2 | 1005 | fsc->mount_options->congestion_kb)) { |
09dc9fc2 | 1006 | set_bdi_congested(inode_to_bdi(inode), |
213c99ee | 1007 | BLK_RW_ASYNC); |
2baba250 YS |
1008 | } |
1009 | ||
0713e5f2 YZ |
1010 | |
1011 | pages[locked_pages++] = page; | |
1012 | pvec.pages[i] = NULL; | |
1013 | ||
09cbfeaf | 1014 | len += PAGE_SIZE; |
1d3576fd SW |
1015 | } |
1016 | ||
1017 | /* did we get anything? */ | |
1018 | if (!locked_pages) | |
1019 | goto release_pvec_pages; | |
1020 | if (i) { | |
0713e5f2 YZ |
1021 | unsigned j, n = 0; |
1022 | /* shift unused page to beginning of pvec */ | |
1023 | for (j = 0; j < pvec_pages; j++) { | |
1024 | if (!pvec.pages[j]) | |
1025 | continue; | |
1026 | if (n < j) | |
1027 | pvec.pages[n] = pvec.pages[j]; | |
1028 | n++; | |
1029 | } | |
1030 | pvec.nr = n; | |
1d3576fd SW |
1031 | |
1032 | if (pvec_pages && i == pvec_pages && | |
1033 | locked_pages < max_pages) { | |
1034 | dout("reached end pvec, trying for more\n"); | |
0713e5f2 | 1035 | pagevec_release(&pvec); |
1d3576fd SW |
1036 | goto get_more_pages; |
1037 | } | |
1d3576fd SW |
1038 | } |
1039 | ||
5b64640c | 1040 | new_request: |
e5975c7c | 1041 | offset = page_offset(pages[0]); |
5b64640c YZ |
1042 | len = wsize; |
1043 | ||
1044 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1045 | &ci->i_layout, vino, | |
1046 | offset, &len, 0, num_ops, | |
1f934b00 YZ |
1047 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
1048 | snapc, ceph_wbc.truncate_seq, | |
1049 | ceph_wbc.truncate_size, false); | |
5b64640c YZ |
1050 | if (IS_ERR(req)) { |
1051 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1052 | &ci->i_layout, vino, | |
1053 | offset, &len, 0, | |
1054 | min(num_ops, | |
1055 | CEPH_OSD_SLAB_OPS), | |
1056 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1057 | CEPH_OSD_FLAG_WRITE, |
1f934b00 YZ |
1058 | snapc, ceph_wbc.truncate_seq, |
1059 | ceph_wbc.truncate_size, true); | |
5b64640c | 1060 | BUG_ON(IS_ERR(req)); |
e1966b49 | 1061 | } |
5b64640c | 1062 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
09cbfeaf | 1063 | PAGE_SIZE - offset); |
5b64640c YZ |
1064 | |
1065 | req->r_callback = writepages_finish; | |
1066 | req->r_inode = inode; | |
1d3576fd | 1067 | |
5b64640c YZ |
1068 | /* Format the osd request message and submit the write */ |
1069 | len = 0; | |
1070 | data_pages = pages; | |
1071 | op_idx = 0; | |
1072 | for (i = 0; i < locked_pages; i++) { | |
1073 | u64 cur_offset = page_offset(pages[i]); | |
1074 | if (offset + len != cur_offset) { | |
3fb99d48 | 1075 | if (op_idx + 1 == req->r_num_ops) |
5b64640c YZ |
1076 | break; |
1077 | osd_req_op_extent_dup_last(req, op_idx, | |
1078 | cur_offset - offset); | |
1079 | dout("writepages got pages at %llu~%llu\n", | |
1080 | offset, len); | |
1081 | osd_req_op_extent_osd_data_pages(req, op_idx, | |
1082 | data_pages, len, 0, | |
a4ce40a9 | 1083 | !!pool, false); |
5b64640c | 1084 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1085 | |
5b64640c YZ |
1086 | len = 0; |
1087 | offset = cur_offset; | |
1088 | data_pages = pages + i; | |
1089 | op_idx++; | |
1090 | } | |
1091 | ||
1092 | set_page_writeback(pages[i]); | |
09cbfeaf | 1093 | len += PAGE_SIZE; |
5b64640c YZ |
1094 | } |
1095 | ||
1f934b00 YZ |
1096 | if (ceph_wbc.size_stable) { |
1097 | len = min(len, ceph_wbc.i_size - offset); | |
5b64640c YZ |
1098 | } else if (i == locked_pages) { |
1099 | /* writepages_finish() clears writeback pages | |
1100 | * according to the data length, so make sure | |
1101 | * data length covers all locked pages */ | |
09cbfeaf | 1102 | u64 min_len = len + 1 - PAGE_SIZE; |
1f934b00 YZ |
1103 | len = get_writepages_data_length(inode, pages[i - 1], |
1104 | offset); | |
5b64640c YZ |
1105 | len = max(len, min_len); |
1106 | } | |
1107 | dout("writepages got pages at %llu~%llu\n", offset, len); | |
e5975c7c | 1108 | |
5b64640c YZ |
1109 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
1110 | 0, !!pool, false); | |
1111 | osd_req_op_extent_update(req, op_idx, len); | |
e5975c7c | 1112 | |
5b64640c YZ |
1113 | BUG_ON(op_idx + 1 != req->r_num_ops); |
1114 | ||
1115 | pool = NULL; | |
1116 | if (i < locked_pages) { | |
1117 | BUG_ON(num_ops <= req->r_num_ops); | |
1118 | num_ops -= req->r_num_ops; | |
5b64640c YZ |
1119 | locked_pages -= i; |
1120 | ||
1121 | /* allocate new pages array for next request */ | |
1122 | data_pages = pages; | |
1123 | pages = kmalloc(locked_pages * sizeof (*pages), | |
1124 | GFP_NOFS); | |
1125 | if (!pages) { | |
1126 | pool = fsc->wb_pagevec_pool; | |
1127 | pages = mempool_alloc(pool, GFP_NOFS); | |
1128 | BUG_ON(!pages); | |
1129 | } | |
1130 | memcpy(pages, data_pages + i, | |
1131 | locked_pages * sizeof(*pages)); | |
1132 | memset(data_pages + i, 0, | |
1133 | locked_pages * sizeof(*pages)); | |
1134 | } else { | |
1135 | BUG_ON(num_ops != req->r_num_ops); | |
1136 | index = pages[i - 1]->index + 1; | |
1137 | /* request message now owns the pages array */ | |
1138 | pages = NULL; | |
1139 | } | |
e5975c7c | 1140 | |
bb873b53 | 1141 | req->r_mtime = inode->i_mtime; |
9d6fcb08 SW |
1142 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
1143 | BUG_ON(rc); | |
1d3576fd SW |
1144 | req = NULL; |
1145 | ||
5b64640c YZ |
1146 | wbc->nr_to_write -= i; |
1147 | if (pages) | |
1148 | goto new_request; | |
1149 | ||
2a2d927e YZ |
1150 | /* |
1151 | * We stop writing back only if we are not doing | |
1152 | * integrity sync. In case of integrity sync we have to | |
1153 | * keep going until we have written all the pages | |
1154 | * we tagged for writeback prior to entering this loop. | |
1155 | */ | |
1156 | if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) | |
1157 | done = stop = true; | |
1d3576fd SW |
1158 | |
1159 | release_pvec_pages: | |
1160 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
1161 | pvec.nr ? pvec.pages[0] : NULL); | |
1162 | pagevec_release(&pvec); | |
1d3576fd SW |
1163 | } |
1164 | ||
1165 | if (should_loop && !done) { | |
1166 | /* more to do; loop back to beginning of file */ | |
1167 | dout("writepages looping back to beginning of file\n"); | |
2a2d927e | 1168 | end = start_index - 1; /* OK even when start_index == 0 */ |
f275635e YZ |
1169 | |
1170 | /* to write dirty pages associated with next snapc, | |
1171 | * we need to wait until current writes complete */ | |
1172 | if (wbc->sync_mode != WB_SYNC_NONE && | |
1173 | start_index == 0 && /* all dirty pages were checked */ | |
1174 | !ceph_wbc.head_snapc) { | |
1175 | struct page *page; | |
1176 | unsigned i, nr; | |
1177 | index = 0; | |
1178 | while ((index <= end) && | |
1179 | (nr = pagevec_lookup_tag(&pvec, mapping, &index, | |
1180 | PAGECACHE_TAG_WRITEBACK, | |
1181 | PAGEVEC_SIZE))) { | |
1182 | for (i = 0; i < nr; i++) { | |
1183 | page = pvec.pages[i]; | |
1184 | if (page_snap_context(page) != snapc) | |
1185 | continue; | |
1186 | wait_on_page_writeback(page); | |
1187 | } | |
1188 | pagevec_release(&pvec); | |
1189 | cond_resched(); | |
1190 | } | |
1191 | } | |
1192 | ||
2a2d927e | 1193 | start_index = 0; |
1d3576fd SW |
1194 | index = 0; |
1195 | goto retry; | |
1196 | } | |
1197 | ||
1198 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1199 | mapping->writeback_index = index; | |
1200 | ||
1201 | out: | |
3ed97d63 | 1202 | ceph_osdc_put_request(req); |
2a2d927e YZ |
1203 | ceph_put_snap_context(last_snapc); |
1204 | dout("writepages dend - startone, rc = %d\n", rc); | |
1d3576fd SW |
1205 | return rc; |
1206 | } | |
1207 | ||
1208 | ||
1209 | ||
1210 | /* | |
1211 | * See if a given @snapc is either writeable, or already written. | |
1212 | */ | |
1213 | static int context_is_writeable_or_written(struct inode *inode, | |
1214 | struct ceph_snap_context *snapc) | |
1215 | { | |
05455e11 | 1216 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); |
6298a337 SW |
1217 | int ret = !oldest || snapc->seq <= oldest->seq; |
1218 | ||
1219 | ceph_put_snap_context(oldest); | |
1220 | return ret; | |
1d3576fd SW |
1221 | } |
1222 | ||
1223 | /* | |
1224 | * We are only allowed to write into/dirty the page if the page is | |
1225 | * clean, or already dirty within the same snap context. | |
8f883c24 SW |
1226 | * |
1227 | * called with page locked. | |
1228 | * return success with page locked, | |
1229 | * or any failure (incl -EAGAIN) with page unlocked. | |
1d3576fd | 1230 | */ |
4af6b225 YS |
1231 | static int ceph_update_writeable_page(struct file *file, |
1232 | loff_t pos, unsigned len, | |
1233 | struct page *page) | |
1d3576fd | 1234 | { |
496ad9aa | 1235 | struct inode *inode = file_inode(file); |
6c93df5d | 1236 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 1237 | struct ceph_inode_info *ci = ceph_inode(inode); |
09cbfeaf KS |
1238 | loff_t page_off = pos & PAGE_MASK; |
1239 | int pos_in_page = pos & ~PAGE_MASK; | |
1d3576fd SW |
1240 | int end_in_page = pos_in_page + len; |
1241 | loff_t i_size; | |
1d3576fd | 1242 | int r; |
80e755fe | 1243 | struct ceph_snap_context *snapc, *oldest; |
1d3576fd | 1244 | |
52953d55 | 1245 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
1246 | dout(" page %p forced umount\n", page); |
1247 | unlock_page(page); | |
1248 | return -EIO; | |
1249 | } | |
1250 | ||
1d3576fd SW |
1251 | retry_locked: |
1252 | /* writepages currently holds page lock, but if we change that later, */ | |
1253 | wait_on_page_writeback(page); | |
1254 | ||
61600ef8 | 1255 | snapc = page_snap_context(page); |
80e755fe | 1256 | if (snapc && snapc != ci->i_head_snapc) { |
1d3576fd SW |
1257 | /* |
1258 | * this page is already dirty in another (older) snap | |
1259 | * context! is it writeable now? | |
1260 | */ | |
05455e11 | 1261 | oldest = get_oldest_context(inode, NULL, NULL); |
80e755fe | 1262 | if (snapc->seq > oldest->seq) { |
6298a337 | 1263 | ceph_put_snap_context(oldest); |
1d3576fd | 1264 | dout(" page %p snapc %p not current or oldest\n", |
6298a337 | 1265 | page, snapc); |
1d3576fd SW |
1266 | /* |
1267 | * queue for writeback, and wait for snapc to | |
1268 | * be writeable or written | |
1269 | */ | |
6298a337 | 1270 | snapc = ceph_get_snap_context(snapc); |
1d3576fd | 1271 | unlock_page(page); |
3c6f6b79 | 1272 | ceph_queue_writeback(inode); |
a78bbd4b | 1273 | r = wait_event_killable(ci->i_cap_wq, |
1d3576fd SW |
1274 | context_is_writeable_or_written(inode, snapc)); |
1275 | ceph_put_snap_context(snapc); | |
8f883c24 SW |
1276 | if (r == -ERESTARTSYS) |
1277 | return r; | |
4af6b225 | 1278 | return -EAGAIN; |
1d3576fd | 1279 | } |
6298a337 | 1280 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1281 | |
1282 | /* yay, writeable, do it now (without dropping page lock) */ | |
1283 | dout(" page %p snapc %p not current, but oldest\n", | |
1284 | page, snapc); | |
1285 | if (!clear_page_dirty_for_io(page)) | |
1286 | goto retry_locked; | |
1287 | r = writepage_nounlock(page, NULL); | |
1288 | if (r < 0) | |
dd2bc473 | 1289 | goto fail_unlock; |
1d3576fd SW |
1290 | goto retry_locked; |
1291 | } | |
1292 | ||
1293 | if (PageUptodate(page)) { | |
1294 | dout(" page %p already uptodate\n", page); | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | /* full page? */ | |
09cbfeaf | 1299 | if (pos_in_page == 0 && len == PAGE_SIZE) |
1d3576fd SW |
1300 | return 0; |
1301 | ||
1302 | /* past end of file? */ | |
99c88e69 | 1303 | i_size = i_size_read(inode); |
1d3576fd | 1304 | |
1d3576fd SW |
1305 | if (page_off >= i_size || |
1306 | (pos_in_page == 0 && (pos+len) >= i_size && | |
09cbfeaf | 1307 | end_in_page - pos_in_page != PAGE_SIZE)) { |
1d3576fd | 1308 | dout(" zeroing %p 0 - %d and %d - %d\n", |
09cbfeaf | 1309 | page, pos_in_page, end_in_page, (int)PAGE_SIZE); |
1d3576fd SW |
1310 | zero_user_segments(page, |
1311 | 0, pos_in_page, | |
09cbfeaf | 1312 | end_in_page, PAGE_SIZE); |
1d3576fd SW |
1313 | return 0; |
1314 | } | |
1315 | ||
1316 | /* we need to read it. */ | |
dd2bc473 YZ |
1317 | r = ceph_do_readpage(file, page); |
1318 | if (r < 0) { | |
1319 | if (r == -EINPROGRESS) | |
1320 | return -EAGAIN; | |
1321 | goto fail_unlock; | |
1322 | } | |
1d3576fd | 1323 | goto retry_locked; |
dd2bc473 | 1324 | fail_unlock: |
1d3576fd SW |
1325 | unlock_page(page); |
1326 | return r; | |
1327 | } | |
1328 | ||
4af6b225 YS |
1329 | /* |
1330 | * We are only allowed to write into/dirty the page if the page is | |
1331 | * clean, or already dirty within the same snap context. | |
1332 | */ | |
1333 | static int ceph_write_begin(struct file *file, struct address_space *mapping, | |
1334 | loff_t pos, unsigned len, unsigned flags, | |
1335 | struct page **pagep, void **fsdata) | |
1336 | { | |
496ad9aa | 1337 | struct inode *inode = file_inode(file); |
4af6b225 | 1338 | struct page *page; |
09cbfeaf | 1339 | pgoff_t index = pos >> PAGE_SHIFT; |
7971bd92 | 1340 | int r; |
4af6b225 YS |
1341 | |
1342 | do { | |
8f883c24 | 1343 | /* get a page */ |
4af6b225 | 1344 | page = grab_cache_page_write_begin(mapping, index, 0); |
7971bd92 SW |
1345 | if (!page) |
1346 | return -ENOMEM; | |
4af6b225 YS |
1347 | |
1348 | dout("write_begin file %p inode %p page %p %d~%d\n", file, | |
213c99ee | 1349 | inode, page, (int)pos, (int)len); |
4af6b225 YS |
1350 | |
1351 | r = ceph_update_writeable_page(file, pos, len, page); | |
c1d00b2d | 1352 | if (r < 0) |
09cbfeaf | 1353 | put_page(page); |
c1d00b2d TK |
1354 | else |
1355 | *pagep = page; | |
4af6b225 YS |
1356 | } while (r == -EAGAIN); |
1357 | ||
1358 | return r; | |
1359 | } | |
1360 | ||
1d3576fd SW |
1361 | /* |
1362 | * we don't do anything in here that simple_write_end doesn't do | |
5dda377c | 1363 | * except adjust dirty page accounting |
1d3576fd SW |
1364 | */ |
1365 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1366 | loff_t pos, unsigned len, unsigned copied, | |
1367 | struct page *page, void *fsdata) | |
1368 | { | |
496ad9aa | 1369 | struct inode *inode = file_inode(file); |
efb0ca76 | 1370 | bool check_cap = false; |
1d3576fd SW |
1371 | |
1372 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1373 | inode, page, (int)pos, (int)copied, (int)len); | |
1374 | ||
1375 | /* zero the stale part of the page if we did a short copy */ | |
b9de313c AV |
1376 | if (!PageUptodate(page)) { |
1377 | if (copied < len) { | |
1378 | copied = 0; | |
1379 | goto out; | |
1380 | } | |
1381 | SetPageUptodate(page); | |
1382 | } | |
1d3576fd SW |
1383 | |
1384 | /* did file size increase? */ | |
99c88e69 | 1385 | if (pos+copied > i_size_read(inode)) |
1d3576fd SW |
1386 | check_cap = ceph_inode_set_size(inode, pos+copied); |
1387 | ||
1d3576fd SW |
1388 | set_page_dirty(page); |
1389 | ||
b9de313c | 1390 | out: |
1d3576fd | 1391 | unlock_page(page); |
09cbfeaf | 1392 | put_page(page); |
1d3576fd SW |
1393 | |
1394 | if (check_cap) | |
1395 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1396 | ||
1397 | return copied; | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * we set .direct_IO to indicate direct io is supported, but since we | |
1402 | * intercept O_DIRECT reads and writes early, this function should | |
1403 | * never get called. | |
1404 | */ | |
c8b8e32d | 1405 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
1d3576fd SW |
1406 | { |
1407 | WARN_ON(1); | |
1408 | return -EINVAL; | |
1409 | } | |
1410 | ||
1411 | const struct address_space_operations ceph_aops = { | |
1412 | .readpage = ceph_readpage, | |
1413 | .readpages = ceph_readpages, | |
1414 | .writepage = ceph_writepage, | |
1415 | .writepages = ceph_writepages_start, | |
1416 | .write_begin = ceph_write_begin, | |
1417 | .write_end = ceph_write_end, | |
1418 | .set_page_dirty = ceph_set_page_dirty, | |
1419 | .invalidatepage = ceph_invalidatepage, | |
1420 | .releasepage = ceph_releasepage, | |
1421 | .direct_IO = ceph_direct_io, | |
1422 | }; | |
1423 | ||
4f7e89f6 YZ |
1424 | static void ceph_block_sigs(sigset_t *oldset) |
1425 | { | |
1426 | sigset_t mask; | |
1427 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
1428 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
1429 | } | |
1430 | ||
1431 | static void ceph_restore_sigs(sigset_t *oldset) | |
1432 | { | |
1433 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
1434 | } | |
1d3576fd SW |
1435 | |
1436 | /* | |
1437 | * vm ops | |
1438 | */ | |
11bac800 | 1439 | static int ceph_filemap_fault(struct vm_fault *vmf) |
61f68816 | 1440 | { |
11bac800 | 1441 | struct vm_area_struct *vma = vmf->vma; |
61f68816 YZ |
1442 | struct inode *inode = file_inode(vma->vm_file); |
1443 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1444 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1445 | struct page *pinned_page = NULL; |
09cbfeaf | 1446 | loff_t off = vmf->pgoff << PAGE_SHIFT; |
61f68816 | 1447 | int want, got, ret; |
4f7e89f6 YZ |
1448 | sigset_t oldset; |
1449 | ||
1450 | ceph_block_sigs(&oldset); | |
61f68816 YZ |
1451 | |
1452 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
09cbfeaf | 1453 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
61f68816 YZ |
1454 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1455 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1456 | else | |
1457 | want = CEPH_CAP_FILE_CACHE; | |
4f7e89f6 YZ |
1458 | |
1459 | got = 0; | |
1460 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); | |
6ce026e4 | 1461 | if (ret < 0) |
4f7e89f6 | 1462 | goto out_restore; |
6ce026e4 | 1463 | |
61f68816 | 1464 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
09cbfeaf | 1465 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
61f68816 | 1466 | |
83701246 | 1467 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
2b1ac852 YZ |
1468 | ci->i_inline_version == CEPH_INLINE_NONE) { |
1469 | current->journal_info = vma->vm_file; | |
11bac800 | 1470 | ret = filemap_fault(vmf); |
2b1ac852 YZ |
1471 | current->journal_info = NULL; |
1472 | } else | |
83701246 | 1473 | ret = -EAGAIN; |
61f68816 YZ |
1474 | |
1475 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", | |
09cbfeaf | 1476 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); |
3738daa6 | 1477 | if (pinned_page) |
09cbfeaf | 1478 | put_page(pinned_page); |
61f68816 YZ |
1479 | ceph_put_cap_refs(ci, got); |
1480 | ||
83701246 | 1481 | if (ret != -EAGAIN) |
4f7e89f6 | 1482 | goto out_restore; |
83701246 YZ |
1483 | |
1484 | /* read inline data */ | |
09cbfeaf | 1485 | if (off >= PAGE_SIZE) { |
83701246 YZ |
1486 | /* does not support inline data > PAGE_SIZE */ |
1487 | ret = VM_FAULT_SIGBUS; | |
1488 | } else { | |
1489 | int ret1; | |
1490 | struct address_space *mapping = inode->i_mapping; | |
1491 | struct page *page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1492 | mapping_gfp_constraint(mapping, |
1493 | ~__GFP_FS)); | |
83701246 YZ |
1494 | if (!page) { |
1495 | ret = VM_FAULT_OOM; | |
4f7e89f6 | 1496 | goto out_inline; |
83701246 YZ |
1497 | } |
1498 | ret1 = __ceph_do_getattr(inode, page, | |
1499 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1500 | if (ret1 < 0 || off >= i_size_read(inode)) { | |
1501 | unlock_page(page); | |
09cbfeaf | 1502 | put_page(page); |
6ce026e4 YZ |
1503 | if (ret1 < 0) |
1504 | ret = ret1; | |
1505 | else | |
1506 | ret = VM_FAULT_SIGBUS; | |
4f7e89f6 | 1507 | goto out_inline; |
83701246 | 1508 | } |
09cbfeaf KS |
1509 | if (ret1 < PAGE_SIZE) |
1510 | zero_user_segment(page, ret1, PAGE_SIZE); | |
83701246 YZ |
1511 | else |
1512 | flush_dcache_page(page); | |
1513 | SetPageUptodate(page); | |
1514 | vmf->page = page; | |
1515 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
4f7e89f6 YZ |
1516 | out_inline: |
1517 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", | |
1518 | inode, off, (size_t)PAGE_SIZE, ret); | |
83701246 | 1519 | } |
4f7e89f6 YZ |
1520 | out_restore: |
1521 | ceph_restore_sigs(&oldset); | |
6ce026e4 YZ |
1522 | if (ret < 0) |
1523 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1524 | ||
61f68816 YZ |
1525 | return ret; |
1526 | } | |
1d3576fd SW |
1527 | |
1528 | /* | |
1529 | * Reuse write_begin here for simplicity. | |
1530 | */ | |
11bac800 | 1531 | static int ceph_page_mkwrite(struct vm_fault *vmf) |
1d3576fd | 1532 | { |
11bac800 | 1533 | struct vm_area_struct *vma = vmf->vma; |
496ad9aa | 1534 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1535 | struct ceph_inode_info *ci = ceph_inode(inode); |
1536 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
f66fd9f0 | 1537 | struct ceph_cap_flush *prealloc_cf; |
61f68816 | 1538 | struct page *page = vmf->page; |
6285bc23 | 1539 | loff_t off = page_offset(page); |
61f68816 YZ |
1540 | loff_t size = i_size_read(inode); |
1541 | size_t len; | |
1542 | int want, got, ret; | |
4f7e89f6 | 1543 | sigset_t oldset; |
3ca9c3bd | 1544 | |
f66fd9f0 YZ |
1545 | prealloc_cf = ceph_alloc_cap_flush(); |
1546 | if (!prealloc_cf) | |
6ce026e4 | 1547 | return VM_FAULT_OOM; |
f66fd9f0 | 1548 | |
4f7e89f6 | 1549 | ceph_block_sigs(&oldset); |
f66fd9f0 | 1550 | |
28127bdd YZ |
1551 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1552 | struct page *locked_page = NULL; | |
1553 | if (off == 0) { | |
1554 | lock_page(page); | |
1555 | locked_page = page; | |
1556 | } | |
1557 | ret = ceph_uninline_data(vma->vm_file, locked_page); | |
1558 | if (locked_page) | |
1559 | unlock_page(locked_page); | |
6ce026e4 | 1560 | if (ret < 0) |
f66fd9f0 | 1561 | goto out_free; |
28127bdd YZ |
1562 | } |
1563 | ||
09cbfeaf KS |
1564 | if (off + PAGE_SIZE <= size) |
1565 | len = PAGE_SIZE; | |
1d3576fd | 1566 | else |
09cbfeaf | 1567 | len = size & ~PAGE_MASK; |
1d3576fd | 1568 | |
61f68816 YZ |
1569 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1570 | inode, ceph_vinop(inode), off, len, size); | |
1571 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1572 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1573 | else | |
1574 | want = CEPH_CAP_FILE_BUFFER; | |
4f7e89f6 YZ |
1575 | |
1576 | got = 0; | |
1577 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, | |
1578 | &got, NULL); | |
6ce026e4 | 1579 | if (ret < 0) |
4f7e89f6 | 1580 | goto out_free; |
6ce026e4 | 1581 | |
61f68816 YZ |
1582 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
1583 | inode, off, len, ceph_cap_string(got)); | |
1584 | ||
1585 | /* Update time before taking page lock */ | |
1586 | file_update_time(vma->vm_file); | |
4af6b225 | 1587 | |
f0b33df5 YZ |
1588 | do { |
1589 | lock_page(page); | |
4af6b225 | 1590 | |
f0b33df5 YZ |
1591 | if ((off > size) || (page->mapping != inode->i_mapping)) { |
1592 | unlock_page(page); | |
1593 | ret = VM_FAULT_NOPAGE; | |
1594 | break; | |
1595 | } | |
1596 | ||
1597 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); | |
1598 | if (ret >= 0) { | |
1599 | /* success. we'll keep the page locked. */ | |
1600 | set_page_dirty(page); | |
1601 | ret = VM_FAULT_LOCKED; | |
1602 | } | |
1603 | } while (ret == -EAGAIN); | |
4af6b225 | 1604 | |
28127bdd YZ |
1605 | if (ret == VM_FAULT_LOCKED || |
1606 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1607 | int dirty; |
1608 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1609 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1610 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1611 | &prealloc_cf); | |
61f68816 YZ |
1612 | spin_unlock(&ci->i_ceph_lock); |
1613 | if (dirty) | |
1614 | __mark_inode_dirty(inode, dirty); | |
1615 | } | |
1616 | ||
1617 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", | |
1618 | inode, off, len, ceph_cap_string(got), ret); | |
1619 | ceph_put_cap_refs(ci, got); | |
f66fd9f0 | 1620 | out_free: |
4f7e89f6 | 1621 | ceph_restore_sigs(&oldset); |
f66fd9f0 | 1622 | ceph_free_cap_flush(prealloc_cf); |
6ce026e4 YZ |
1623 | if (ret < 0) |
1624 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1d3576fd SW |
1625 | return ret; |
1626 | } | |
1627 | ||
31c542a1 YZ |
1628 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1629 | char *data, size_t len) | |
1630 | { | |
1631 | struct address_space *mapping = inode->i_mapping; | |
1632 | struct page *page; | |
1633 | ||
1634 | if (locked_page) { | |
1635 | page = locked_page; | |
1636 | } else { | |
1637 | if (i_size_read(inode) == 0) | |
1638 | return; | |
1639 | page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1640 | mapping_gfp_constraint(mapping, |
1641 | ~__GFP_FS)); | |
31c542a1 YZ |
1642 | if (!page) |
1643 | return; | |
1644 | if (PageUptodate(page)) { | |
1645 | unlock_page(page); | |
09cbfeaf | 1646 | put_page(page); |
31c542a1 YZ |
1647 | return; |
1648 | } | |
1649 | } | |
1650 | ||
0668ff52 | 1651 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1652 | inode, ceph_vinop(inode), len, locked_page); |
1653 | ||
1654 | if (len > 0) { | |
1655 | void *kaddr = kmap_atomic(page); | |
1656 | memcpy(kaddr, data, len); | |
1657 | kunmap_atomic(kaddr); | |
1658 | } | |
1659 | ||
1660 | if (page != locked_page) { | |
09cbfeaf KS |
1661 | if (len < PAGE_SIZE) |
1662 | zero_user_segment(page, len, PAGE_SIZE); | |
31c542a1 YZ |
1663 | else |
1664 | flush_dcache_page(page); | |
1665 | ||
1666 | SetPageUptodate(page); | |
1667 | unlock_page(page); | |
09cbfeaf | 1668 | put_page(page); |
31c542a1 YZ |
1669 | } |
1670 | } | |
1671 | ||
28127bdd YZ |
1672 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1673 | { | |
1674 | struct inode *inode = file_inode(filp); | |
1675 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1676 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1677 | struct ceph_osd_request *req; | |
1678 | struct page *page = NULL; | |
1679 | u64 len, inline_version; | |
1680 | int err = 0; | |
1681 | bool from_pagecache = false; | |
1682 | ||
1683 | spin_lock(&ci->i_ceph_lock); | |
1684 | inline_version = ci->i_inline_version; | |
1685 | spin_unlock(&ci->i_ceph_lock); | |
1686 | ||
1687 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1688 | inode, ceph_vinop(inode), inline_version); | |
1689 | ||
1690 | if (inline_version == 1 || /* initial version, no data */ | |
1691 | inline_version == CEPH_INLINE_NONE) | |
1692 | goto out; | |
1693 | ||
1694 | if (locked_page) { | |
1695 | page = locked_page; | |
1696 | WARN_ON(!PageUptodate(page)); | |
1697 | } else if (ceph_caps_issued(ci) & | |
1698 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1699 | page = find_get_page(inode->i_mapping, 0); | |
1700 | if (page) { | |
1701 | if (PageUptodate(page)) { | |
1702 | from_pagecache = true; | |
1703 | lock_page(page); | |
1704 | } else { | |
09cbfeaf | 1705 | put_page(page); |
28127bdd YZ |
1706 | page = NULL; |
1707 | } | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | if (page) { | |
1712 | len = i_size_read(inode); | |
09cbfeaf KS |
1713 | if (len > PAGE_SIZE) |
1714 | len = PAGE_SIZE; | |
28127bdd YZ |
1715 | } else { |
1716 | page = __page_cache_alloc(GFP_NOFS); | |
1717 | if (!page) { | |
1718 | err = -ENOMEM; | |
1719 | goto out; | |
1720 | } | |
1721 | err = __ceph_do_getattr(inode, page, | |
1722 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1723 | if (err < 0) { | |
1724 | /* no inline data */ | |
1725 | if (err == -ENODATA) | |
1726 | err = 0; | |
1727 | goto out; | |
1728 | } | |
1729 | len = err; | |
1730 | } | |
1731 | ||
1732 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1733 | ceph_vino(inode), 0, &len, 0, 1, | |
54ea0046 | 1734 | CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, |
34b759b4 | 1735 | NULL, 0, 0, false); |
28127bdd YZ |
1736 | if (IS_ERR(req)) { |
1737 | err = PTR_ERR(req); | |
1738 | goto out; | |
1739 | } | |
1740 | ||
bb873b53 | 1741 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1742 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1743 | if (!err) | |
1744 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1745 | ceph_osdc_put_request(req); | |
1746 | if (err < 0) | |
1747 | goto out; | |
1748 | ||
1749 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1750 | ceph_vino(inode), 0, &len, 1, 3, | |
54ea0046 | 1751 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
34b759b4 ID |
1752 | NULL, ci->i_truncate_seq, |
1753 | ci->i_truncate_size, false); | |
28127bdd YZ |
1754 | if (IS_ERR(req)) { |
1755 | err = PTR_ERR(req); | |
1756 | goto out; | |
1757 | } | |
1758 | ||
1759 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1760 | ||
ec137c10 YZ |
1761 | { |
1762 | __le64 xattr_buf = cpu_to_le64(inline_version); | |
1763 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1764 | "inline_version", &xattr_buf, | |
1765 | sizeof(xattr_buf), | |
1766 | CEPH_OSD_CMPXATTR_OP_GT, | |
1767 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1768 | if (err) | |
1769 | goto out_put; | |
1770 | } | |
1771 | ||
1772 | { | |
1773 | char xattr_buf[32]; | |
1774 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), | |
1775 | "%llu", inline_version); | |
1776 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1777 | "inline_version", | |
1778 | xattr_buf, xattr_len, 0, 0); | |
1779 | if (err) | |
1780 | goto out_put; | |
1781 | } | |
28127bdd | 1782 | |
bb873b53 | 1783 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1784 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1785 | if (!err) | |
1786 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1787 | out_put: | |
1788 | ceph_osdc_put_request(req); | |
1789 | if (err == -ECANCELED) | |
1790 | err = 0; | |
1791 | out: | |
1792 | if (page && page != locked_page) { | |
1793 | if (from_pagecache) { | |
1794 | unlock_page(page); | |
09cbfeaf | 1795 | put_page(page); |
28127bdd YZ |
1796 | } else |
1797 | __free_pages(page, 0); | |
1798 | } | |
1799 | ||
1800 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1801 | inode, ceph_vinop(inode), inline_version, err); | |
1802 | return err; | |
1803 | } | |
1804 | ||
7cbea8dc | 1805 | static const struct vm_operations_struct ceph_vmops = { |
61f68816 | 1806 | .fault = ceph_filemap_fault, |
1d3576fd SW |
1807 | .page_mkwrite = ceph_page_mkwrite, |
1808 | }; | |
1809 | ||
1810 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1811 | { | |
1812 | struct address_space *mapping = file->f_mapping; | |
1813 | ||
1814 | if (!mapping->a_ops->readpage) | |
1815 | return -ENOEXEC; | |
1816 | file_accessed(file); | |
1817 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1818 | return 0; |
1819 | } | |
10183a69 YZ |
1820 | |
1821 | enum { | |
1822 | POOL_READ = 1, | |
1823 | POOL_WRITE = 2, | |
1824 | }; | |
1825 | ||
779fe0fb YZ |
1826 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
1827 | s64 pool, struct ceph_string *pool_ns) | |
10183a69 YZ |
1828 | { |
1829 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1830 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1831 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; | |
1832 | struct rb_node **p, *parent; | |
1833 | struct ceph_pool_perm *perm; | |
1834 | struct page **pages; | |
779fe0fb | 1835 | size_t pool_ns_len; |
10183a69 YZ |
1836 | int err = 0, err2 = 0, have = 0; |
1837 | ||
1838 | down_read(&mdsc->pool_perm_rwsem); | |
1839 | p = &mdsc->pool_perm_tree.rb_node; | |
1840 | while (*p) { | |
1841 | perm = rb_entry(*p, struct ceph_pool_perm, node); | |
1842 | if (pool < perm->pool) | |
1843 | p = &(*p)->rb_left; | |
1844 | else if (pool > perm->pool) | |
1845 | p = &(*p)->rb_right; | |
1846 | else { | |
779fe0fb YZ |
1847 | int ret = ceph_compare_string(pool_ns, |
1848 | perm->pool_ns, | |
1849 | perm->pool_ns_len); | |
1850 | if (ret < 0) | |
1851 | p = &(*p)->rb_left; | |
1852 | else if (ret > 0) | |
1853 | p = &(*p)->rb_right; | |
1854 | else { | |
1855 | have = perm->perm; | |
1856 | break; | |
1857 | } | |
10183a69 YZ |
1858 | } |
1859 | } | |
1860 | up_read(&mdsc->pool_perm_rwsem); | |
1861 | if (*p) | |
1862 | goto out; | |
1863 | ||
779fe0fb YZ |
1864 | if (pool_ns) |
1865 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", | |
1866 | pool, (int)pool_ns->len, pool_ns->str); | |
1867 | else | |
1868 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); | |
10183a69 YZ |
1869 | |
1870 | down_write(&mdsc->pool_perm_rwsem); | |
779fe0fb | 1871 | p = &mdsc->pool_perm_tree.rb_node; |
10183a69 YZ |
1872 | parent = NULL; |
1873 | while (*p) { | |
1874 | parent = *p; | |
1875 | perm = rb_entry(parent, struct ceph_pool_perm, node); | |
1876 | if (pool < perm->pool) | |
1877 | p = &(*p)->rb_left; | |
1878 | else if (pool > perm->pool) | |
1879 | p = &(*p)->rb_right; | |
1880 | else { | |
779fe0fb YZ |
1881 | int ret = ceph_compare_string(pool_ns, |
1882 | perm->pool_ns, | |
1883 | perm->pool_ns_len); | |
1884 | if (ret < 0) | |
1885 | p = &(*p)->rb_left; | |
1886 | else if (ret > 0) | |
1887 | p = &(*p)->rb_right; | |
1888 | else { | |
1889 | have = perm->perm; | |
1890 | break; | |
1891 | } | |
10183a69 YZ |
1892 | } |
1893 | } | |
1894 | if (*p) { | |
1895 | up_write(&mdsc->pool_perm_rwsem); | |
1896 | goto out; | |
1897 | } | |
1898 | ||
34b759b4 | 1899 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1900 | 1, false, GFP_NOFS); |
1901 | if (!rd_req) { | |
1902 | err = -ENOMEM; | |
1903 | goto out_unlock; | |
1904 | } | |
1905 | ||
1906 | rd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1907 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); | |
1908 | rd_req->r_base_oloc.pool = pool; | |
779fe0fb YZ |
1909 | if (pool_ns) |
1910 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); | |
d30291b9 | 1911 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
10183a69 | 1912 | |
13d1ad16 ID |
1913 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
1914 | if (err) | |
1915 | goto out_unlock; | |
10183a69 | 1916 | |
34b759b4 | 1917 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1918 | 1, false, GFP_NOFS); |
1919 | if (!wr_req) { | |
1920 | err = -ENOMEM; | |
1921 | goto out_unlock; | |
1922 | } | |
1923 | ||
54ea0046 | 1924 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE; |
10183a69 | 1925 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
63244fa1 | 1926 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
d30291b9 | 1927 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
10183a69 | 1928 | |
13d1ad16 ID |
1929 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
1930 | if (err) | |
1931 | goto out_unlock; | |
10183a69 YZ |
1932 | |
1933 | /* one page should be large enough for STAT data */ | |
1934 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); | |
1935 | if (IS_ERR(pages)) { | |
1936 | err = PTR_ERR(pages); | |
1937 | goto out_unlock; | |
1938 | } | |
1939 | ||
1940 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, | |
1941 | 0, false, true); | |
10183a69 YZ |
1942 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
1943 | ||
bb873b53 | 1944 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
a1f4020a | 1945 | wr_req->r_abort_on_full = true; |
10183a69 YZ |
1946 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
1947 | ||
1948 | if (!err) | |
1949 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); | |
1950 | if (!err2) | |
1951 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); | |
1952 | ||
1953 | if (err >= 0 || err == -ENOENT) | |
1954 | have |= POOL_READ; | |
1955 | else if (err != -EPERM) | |
1956 | goto out_unlock; | |
1957 | ||
1958 | if (err2 == 0 || err2 == -EEXIST) | |
1959 | have |= POOL_WRITE; | |
1960 | else if (err2 != -EPERM) { | |
1961 | err = err2; | |
1962 | goto out_unlock; | |
1963 | } | |
1964 | ||
779fe0fb YZ |
1965 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
1966 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); | |
10183a69 YZ |
1967 | if (!perm) { |
1968 | err = -ENOMEM; | |
1969 | goto out_unlock; | |
1970 | } | |
1971 | ||
1972 | perm->pool = pool; | |
1973 | perm->perm = have; | |
779fe0fb YZ |
1974 | perm->pool_ns_len = pool_ns_len; |
1975 | if (pool_ns_len > 0) | |
1976 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); | |
1977 | perm->pool_ns[pool_ns_len] = 0; | |
1978 | ||
10183a69 YZ |
1979 | rb_link_node(&perm->node, parent, p); |
1980 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); | |
1981 | err = 0; | |
1982 | out_unlock: | |
1983 | up_write(&mdsc->pool_perm_rwsem); | |
1984 | ||
3ed97d63 ID |
1985 | ceph_osdc_put_request(rd_req); |
1986 | ceph_osdc_put_request(wr_req); | |
10183a69 YZ |
1987 | out: |
1988 | if (!err) | |
1989 | err = have; | |
779fe0fb YZ |
1990 | if (pool_ns) |
1991 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", | |
1992 | pool, (int)pool_ns->len, pool_ns->str, err); | |
1993 | else | |
1994 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); | |
10183a69 YZ |
1995 | return err; |
1996 | } | |
1997 | ||
1998 | int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) | |
1999 | { | |
7627151e | 2000 | s64 pool; |
779fe0fb | 2001 | struct ceph_string *pool_ns; |
10183a69 YZ |
2002 | int ret, flags; |
2003 | ||
80e80fbb YZ |
2004 | if (ci->i_vino.snap != CEPH_NOSNAP) { |
2005 | /* | |
2006 | * Pool permission check needs to write to the first object. | |
2007 | * But for snapshot, head of the first object may have alread | |
2008 | * been deleted. Skip check to avoid creating orphan object. | |
2009 | */ | |
2010 | return 0; | |
2011 | } | |
2012 | ||
10183a69 YZ |
2013 | if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), |
2014 | NOPOOLPERM)) | |
2015 | return 0; | |
2016 | ||
2017 | spin_lock(&ci->i_ceph_lock); | |
2018 | flags = ci->i_ceph_flags; | |
7627151e | 2019 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2020 | spin_unlock(&ci->i_ceph_lock); |
2021 | check: | |
2022 | if (flags & CEPH_I_POOL_PERM) { | |
2023 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { | |
7627151e | 2024 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
10183a69 YZ |
2025 | pool); |
2026 | return -EPERM; | |
2027 | } | |
2028 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { | |
7627151e | 2029 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
10183a69 YZ |
2030 | pool); |
2031 | return -EPERM; | |
2032 | } | |
2033 | return 0; | |
2034 | } | |
2035 | ||
779fe0fb YZ |
2036 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
2037 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); | |
2038 | ceph_put_string(pool_ns); | |
10183a69 YZ |
2039 | if (ret < 0) |
2040 | return ret; | |
2041 | ||
2042 | flags = CEPH_I_POOL_PERM; | |
2043 | if (ret & POOL_READ) | |
2044 | flags |= CEPH_I_POOL_RD; | |
2045 | if (ret & POOL_WRITE) | |
2046 | flags |= CEPH_I_POOL_WR; | |
2047 | ||
2048 | spin_lock(&ci->i_ceph_lock); | |
779fe0fb YZ |
2049 | if (pool == ci->i_layout.pool_id && |
2050 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { | |
2051 | ci->i_ceph_flags |= flags; | |
10183a69 | 2052 | } else { |
7627151e | 2053 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2054 | flags = ci->i_ceph_flags; |
2055 | } | |
2056 | spin_unlock(&ci->i_ceph_lock); | |
2057 | goto check; | |
2058 | } | |
2059 | ||
2060 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) | |
2061 | { | |
2062 | struct ceph_pool_perm *perm; | |
2063 | struct rb_node *n; | |
2064 | ||
2065 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { | |
2066 | n = rb_first(&mdsc->pool_perm_tree); | |
2067 | perm = rb_entry(n, struct ceph_pool_perm, node); | |
2068 | rb_erase(n, &mdsc->pool_perm_tree); | |
2069 | kfree(perm); | |
2070 | } | |
2071 | } |