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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
1d3576fd SW |
2 | |
3 | #include <linux/backing-dev.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/pagemap.h> | |
7 | #include <linux/writeback.h> /* generic_writepages */ | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
1d3576fd SW |
9 | #include <linux/pagevec.h> |
10 | #include <linux/task_io_accounting_ops.h> | |
f361bf4a | 11 | #include <linux/signal.h> |
1d3576fd SW |
12 | |
13 | #include "super.h" | |
3d14c5d2 | 14 | #include "mds_client.h" |
99ccbd22 | 15 | #include "cache.h" |
3d14c5d2 | 16 | #include <linux/ceph/osd_client.h> |
1d3576fd SW |
17 | |
18 | /* | |
19 | * Ceph address space ops. | |
20 | * | |
21 | * There are a few funny things going on here. | |
22 | * | |
23 | * The page->private field is used to reference a struct | |
24 | * ceph_snap_context for _every_ dirty page. This indicates which | |
25 | * snapshot the page was logically dirtied in, and thus which snap | |
26 | * context needs to be associated with the osd write during writeback. | |
27 | * | |
28 | * Similarly, struct ceph_inode_info maintains a set of counters to | |
25985edc | 29 | * count dirty pages on the inode. In the absence of snapshots, |
1d3576fd SW |
30 | * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. |
31 | * | |
32 | * When a snapshot is taken (that is, when the client receives | |
33 | * notification that a snapshot was taken), each inode with caps and | |
34 | * with dirty pages (dirty pages implies there is a cap) gets a new | |
35 | * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending | |
36 | * order, new snaps go to the tail). The i_wrbuffer_ref_head count is | |
37 | * moved to capsnap->dirty. (Unless a sync write is currently in | |
38 | * progress. In that case, the capsnap is said to be "pending", new | |
39 | * writes cannot start, and the capsnap isn't "finalized" until the | |
40 | * write completes (or fails) and a final size/mtime for the inode for | |
41 | * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. | |
42 | * | |
43 | * On writeback, we must submit writes to the osd IN SNAP ORDER. So, | |
44 | * we look for the first capsnap in i_cap_snaps and write out pages in | |
45 | * that snap context _only_. Then we move on to the next capsnap, | |
46 | * eventually reaching the "live" or "head" context (i.e., pages that | |
47 | * are not yet snapped) and are writing the most recently dirtied | |
48 | * pages. | |
49 | * | |
50 | * Invalidate and so forth must take care to ensure the dirty page | |
51 | * accounting is preserved. | |
52 | */ | |
53 | ||
2baba250 YS |
54 | #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) |
55 | #define CONGESTION_OFF_THRESH(congestion_kb) \ | |
56 | (CONGESTION_ON_THRESH(congestion_kb) - \ | |
57 | (CONGESTION_ON_THRESH(congestion_kb) >> 2)) | |
58 | ||
61600ef8 YZ |
59 | static inline struct ceph_snap_context *page_snap_context(struct page *page) |
60 | { | |
61 | if (PagePrivate(page)) | |
62 | return (void *)page->private; | |
63 | return NULL; | |
64 | } | |
1d3576fd SW |
65 | |
66 | /* | |
67 | * Dirty a page. Optimistically adjust accounting, on the assumption | |
68 | * that we won't race with invalidate. If we do, readjust. | |
69 | */ | |
70 | static int ceph_set_page_dirty(struct page *page) | |
71 | { | |
72 | struct address_space *mapping = page->mapping; | |
73 | struct inode *inode; | |
74 | struct ceph_inode_info *ci; | |
1d3576fd | 75 | struct ceph_snap_context *snapc; |
7d6e1f54 | 76 | int ret; |
1d3576fd SW |
77 | |
78 | if (unlikely(!mapping)) | |
79 | return !TestSetPageDirty(page); | |
80 | ||
7d6e1f54 | 81 | if (PageDirty(page)) { |
1d3576fd SW |
82 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
83 | mapping->host, page, page->index); | |
7d6e1f54 | 84 | BUG_ON(!PagePrivate(page)); |
1d3576fd SW |
85 | return 0; |
86 | } | |
87 | ||
88 | inode = mapping->host; | |
89 | ci = ceph_inode(inode); | |
90 | ||
1d3576fd | 91 | /* dirty the head */ |
be655596 | 92 | spin_lock(&ci->i_ceph_lock); |
5dda377c YZ |
93 | BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference |
94 | if (__ceph_have_pending_cap_snap(ci)) { | |
95 | struct ceph_cap_snap *capsnap = | |
96 | list_last_entry(&ci->i_cap_snaps, | |
97 | struct ceph_cap_snap, | |
98 | ci_item); | |
99 | snapc = ceph_get_snap_context(capsnap->context); | |
100 | capsnap->dirty_pages++; | |
101 | } else { | |
102 | BUG_ON(!ci->i_head_snapc); | |
103 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
104 | ++ci->i_wrbuffer_ref_head; | |
105 | } | |
1d3576fd | 106 | if (ci->i_wrbuffer_ref == 0) |
0444d76a | 107 | ihold(inode); |
1d3576fd SW |
108 | ++ci->i_wrbuffer_ref; |
109 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " | |
110 | "snapc %p seq %lld (%d snaps)\n", | |
111 | mapping->host, page, page->index, | |
112 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, | |
113 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
114 | snapc, snapc->seq, snapc->num_snaps); | |
be655596 | 115 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd | 116 | |
7d6e1f54 SZ |
117 | /* |
118 | * Reference snap context in page->private. Also set | |
119 | * PagePrivate so that we get invalidatepage callback. | |
120 | */ | |
121 | BUG_ON(PagePrivate(page)); | |
122 | page->private = (unsigned long)snapc; | |
123 | SetPagePrivate(page); | |
1d3576fd | 124 | |
7d6e1f54 SZ |
125 | ret = __set_page_dirty_nobuffers(page); |
126 | WARN_ON(!PageLocked(page)); | |
127 | WARN_ON(!page->mapping); | |
1d3576fd | 128 | |
7d6e1f54 | 129 | return ret; |
1d3576fd SW |
130 | } |
131 | ||
132 | /* | |
133 | * If we are truncating the full page (i.e. offset == 0), adjust the | |
134 | * dirty page counters appropriately. Only called if there is private | |
135 | * data on the page. | |
136 | */ | |
d47992f8 LC |
137 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
138 | unsigned int length) | |
1d3576fd | 139 | { |
4ce1e9ad | 140 | struct inode *inode; |
1d3576fd | 141 | struct ceph_inode_info *ci; |
61600ef8 | 142 | struct ceph_snap_context *snapc = page_snap_context(page); |
1d3576fd | 143 | |
4ce1e9ad | 144 | inode = page->mapping->host; |
b150f5c1 MT |
145 | ci = ceph_inode(inode); |
146 | ||
09cbfeaf | 147 | if (offset != 0 || length != PAGE_SIZE) { |
b150f5c1 MT |
148 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
149 | inode, page, page->index, offset, length); | |
150 | return; | |
151 | } | |
4ce1e9ad | 152 | |
99ccbd22 MT |
153 | ceph_invalidate_fscache_page(inode, page); |
154 | ||
155 | if (!PagePrivate(page)) | |
156 | return; | |
157 | ||
1d3576fd SW |
158 | /* |
159 | * We can get non-dirty pages here due to races between | |
160 | * set_page_dirty and truncate_complete_page; just spit out a | |
161 | * warning, in case we end up with accounting problems later. | |
162 | */ | |
163 | if (!PageDirty(page)) | |
164 | pr_err("%p invalidatepage %p page not dirty\n", inode, page); | |
165 | ||
b150f5c1 | 166 | ClearPageChecked(page); |
1d3576fd | 167 | |
b150f5c1 MT |
168 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
169 | inode, page, page->index); | |
170 | ||
171 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
172 | ceph_put_snap_context(snapc); | |
173 | page->private = 0; | |
174 | ClearPagePrivate(page); | |
1d3576fd SW |
175 | } |
176 | ||
1d3576fd SW |
177 | static int ceph_releasepage(struct page *page, gfp_t g) |
178 | { | |
e55f1a18 N |
179 | dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, |
180 | page, page->index, PageDirty(page) ? "" : "not "); | |
99ccbd22 MT |
181 | |
182 | /* Can we release the page from the cache? */ | |
183 | if (!ceph_release_fscache_page(page, g)) | |
184 | return 0; | |
185 | ||
186 | return !PagePrivate(page); | |
1d3576fd SW |
187 | } |
188 | ||
189 | /* | |
190 | * read a single page, without unlocking it. | |
191 | */ | |
192 | static int readpage_nounlock(struct file *filp, struct page *page) | |
193 | { | |
496ad9aa | 194 | struct inode *inode = file_inode(filp); |
1d3576fd | 195 | struct ceph_inode_info *ci = ceph_inode(inode); |
99ccbd22 | 196 | struct ceph_osd_client *osdc = |
3d14c5d2 | 197 | &ceph_inode_to_client(inode)->client->osdc; |
1d3576fd | 198 | int err = 0; |
83701246 | 199 | u64 off = page_offset(page); |
09cbfeaf | 200 | u64 len = PAGE_SIZE; |
1d3576fd | 201 | |
83701246 | 202 | if (off >= i_size_read(inode)) { |
09cbfeaf | 203 | zero_user_segment(page, 0, PAGE_SIZE); |
83701246 YZ |
204 | SetPageUptodate(page); |
205 | return 0; | |
206 | } | |
99ccbd22 | 207 | |
fcc02d2a YZ |
208 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
209 | /* | |
210 | * Uptodate inline data should have been added | |
211 | * into page cache while getting Fcr caps. | |
212 | */ | |
213 | if (off == 0) | |
214 | return -EINVAL; | |
09cbfeaf | 215 | zero_user_segment(page, 0, PAGE_SIZE); |
fcc02d2a YZ |
216 | SetPageUptodate(page); |
217 | return 0; | |
218 | } | |
83701246 YZ |
219 | |
220 | err = ceph_readpage_from_fscache(inode, page); | |
99ccbd22 MT |
221 | if (err == 0) |
222 | goto out; | |
223 | ||
1d3576fd SW |
224 | dout("readpage inode %p file %p page %p index %lu\n", |
225 | inode, filp, page, page->index); | |
226 | err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, | |
83701246 | 227 | off, &len, |
1d3576fd | 228 | ci->i_truncate_seq, ci->i_truncate_size, |
b7495fc2 | 229 | &page, 1, 0); |
1d3576fd SW |
230 | if (err == -ENOENT) |
231 | err = 0; | |
232 | if (err < 0) { | |
233 | SetPageError(page); | |
18302805 | 234 | ceph_fscache_readpage_cancel(inode, page); |
1d3576fd | 235 | goto out; |
1d3576fd | 236 | } |
09cbfeaf | 237 | if (err < PAGE_SIZE) |
23cd573b | 238 | /* zero fill remainder of page */ |
09cbfeaf | 239 | zero_user_segment(page, err, PAGE_SIZE); |
23cd573b ZZ |
240 | else |
241 | flush_dcache_page(page); | |
1d3576fd | 242 | |
23cd573b ZZ |
243 | SetPageUptodate(page); |
244 | ceph_readpage_to_fscache(inode, page); | |
99ccbd22 | 245 | |
1d3576fd SW |
246 | out: |
247 | return err < 0 ? err : 0; | |
248 | } | |
249 | ||
250 | static int ceph_readpage(struct file *filp, struct page *page) | |
251 | { | |
252 | int r = readpage_nounlock(filp, page); | |
253 | unlock_page(page); | |
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 SW |
269 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
270 | ||
271 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 272 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
273 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
274 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
275 | (u64)osd_data->length); | |
e0c59487 | 276 | for (i = 0; i < num_pages; i++) { |
87060c10 | 277 | struct page *page = osd_data->pages[i]; |
7c272194 | 278 | |
368e3585 YZ |
279 | if (rc < 0 && rc != -ENOENT) { |
280 | ceph_fscache_readpage_cancel(inode, page); | |
f36132a7 | 281 | goto unlock; |
368e3585 | 282 | } |
09cbfeaf | 283 | if (bytes < (int)PAGE_SIZE) { |
7c272194 SW |
284 | /* zero (remainder of) page */ |
285 | int s = bytes < 0 ? 0 : bytes; | |
09cbfeaf | 286 | zero_user_segment(page, s, PAGE_SIZE); |
1d3576fd | 287 | } |
7c272194 SW |
288 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
289 | page->index); | |
290 | flush_dcache_page(page); | |
291 | SetPageUptodate(page); | |
99ccbd22 | 292 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 293 | unlock: |
7c272194 | 294 | unlock_page(page); |
09cbfeaf KS |
295 | put_page(page); |
296 | bytes -= PAGE_SIZE; | |
1d3576fd | 297 | } |
87060c10 | 298 | kfree(osd_data->pages); |
1d3576fd SW |
299 | } |
300 | ||
301 | /* | |
7c272194 SW |
302 | * start an async read(ahead) operation. return nr_pages we submitted |
303 | * a read for on success, or negative error code. | |
1d3576fd | 304 | */ |
0d66a487 | 305 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
1d3576fd | 306 | { |
3d14c5d2 YS |
307 | struct ceph_osd_client *osdc = |
308 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 SW |
309 | struct ceph_inode_info *ci = ceph_inode(inode); |
310 | struct page *page = list_entry(page_list->prev, struct page, lru); | |
acead002 | 311 | struct ceph_vino vino; |
7c272194 SW |
312 | struct ceph_osd_request *req; |
313 | u64 off; | |
1d3576fd | 314 | u64 len; |
7c272194 SW |
315 | int i; |
316 | struct page **pages; | |
317 | pgoff_t next_index; | |
318 | int nr_pages = 0; | |
2b1ac852 YZ |
319 | int got = 0; |
320 | int ret = 0; | |
321 | ||
322 | if (!current->journal_info) { | |
323 | /* caller of readpages does not hold buffer and read caps | |
324 | * (fadvise, madvise and readahead cases) */ | |
325 | int want = CEPH_CAP_FILE_CACHE; | |
326 | ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); | |
327 | if (ret < 0) { | |
328 | dout("start_read %p, error getting cap\n", inode); | |
329 | } else if (!(got & want)) { | |
330 | dout("start_read %p, no cache cap\n", inode); | |
331 | ret = 0; | |
332 | } | |
333 | if (ret <= 0) { | |
334 | if (got) | |
335 | ceph_put_cap_refs(ci, got); | |
336 | while (!list_empty(page_list)) { | |
337 | page = list_entry(page_list->prev, | |
338 | struct page, lru); | |
339 | list_del(&page->lru); | |
340 | put_page(page); | |
341 | } | |
342 | return ret; | |
343 | } | |
344 | } | |
1d3576fd | 345 | |
6285bc23 | 346 | off = (u64) page_offset(page); |
1d3576fd | 347 | |
7c272194 SW |
348 | /* count pages */ |
349 | next_index = page->index; | |
350 | list_for_each_entry_reverse(page, page_list, lru) { | |
351 | if (page->index != next_index) | |
352 | break; | |
353 | nr_pages++; | |
354 | next_index++; | |
0d66a487 SW |
355 | if (max && nr_pages == max) |
356 | break; | |
7c272194 | 357 | } |
09cbfeaf | 358 | len = nr_pages << PAGE_SHIFT; |
7c272194 SW |
359 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
360 | off, len); | |
acead002 AE |
361 | vino = ceph_vino(inode); |
362 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 363 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 364 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 365 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 366 | false); |
2b1ac852 YZ |
367 | if (IS_ERR(req)) { |
368 | ret = PTR_ERR(req); | |
369 | goto out; | |
370 | } | |
1d3576fd | 371 | |
7c272194 | 372 | /* build page vector */ |
cf7b7e14 | 373 | nr_pages = calc_pages_for(0, len); |
687265e5 | 374 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); |
2b1ac852 YZ |
375 | if (!pages) { |
376 | ret = -ENOMEM; | |
377 | goto out_put; | |
378 | } | |
7c272194 SW |
379 | for (i = 0; i < nr_pages; ++i) { |
380 | page = list_entry(page_list->prev, struct page, lru); | |
381 | BUG_ON(PageLocked(page)); | |
1d3576fd | 382 | list_del(&page->lru); |
99ccbd22 | 383 | |
7c272194 SW |
384 | dout("start_read %p adding %p idx %lu\n", inode, page, |
385 | page->index); | |
386 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
687265e5 | 387 | GFP_KERNEL)) { |
d4d3aa38 | 388 | ceph_fscache_uncache_page(inode, page); |
09cbfeaf | 389 | put_page(page); |
7c272194 | 390 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 391 | inode, page); |
7c272194 | 392 | nr_pages = i; |
1afe4785 YZ |
393 | if (nr_pages > 0) { |
394 | len = nr_pages << PAGE_SHIFT; | |
d641df81 | 395 | osd_req_op_extent_update(req, 0, len); |
1afe4785 YZ |
396 | break; |
397 | } | |
7c272194 | 398 | goto out_pages; |
1d3576fd | 399 | } |
7c272194 | 400 | pages[i] = page; |
1d3576fd | 401 | } |
406e2c9f | 402 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
403 | req->r_callback = finish_read; |
404 | req->r_inode = inode; | |
405 | ||
406 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); | |
407 | ret = ceph_osdc_start_request(osdc, req, false); | |
408 | if (ret < 0) | |
409 | goto out_pages; | |
410 | ceph_osdc_put_request(req); | |
2b1ac852 YZ |
411 | |
412 | /* After adding locked pages to page cache, the inode holds cache cap. | |
413 | * So we can drop our cap refs. */ | |
414 | if (got) | |
415 | ceph_put_cap_refs(ci, got); | |
416 | ||
7c272194 SW |
417 | return nr_pages; |
418 | ||
419 | out_pages: | |
1afe4785 YZ |
420 | for (i = 0; i < nr_pages; ++i) { |
421 | ceph_fscache_readpage_cancel(inode, pages[i]); | |
422 | unlock_page(pages[i]); | |
423 | } | |
424 | ceph_put_page_vector(pages, nr_pages, false); | |
2b1ac852 | 425 | out_put: |
7c272194 | 426 | ceph_osdc_put_request(req); |
2b1ac852 YZ |
427 | out: |
428 | if (got) | |
429 | ceph_put_cap_refs(ci, got); | |
7c272194 SW |
430 | return ret; |
431 | } | |
1d3576fd | 432 | |
7c272194 SW |
433 | |
434 | /* | |
435 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
436 | * the caller (VM) cleans them up. | |
437 | */ | |
438 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
439 | struct list_head *page_list, unsigned nr_pages) | |
440 | { | |
496ad9aa | 441 | struct inode *inode = file_inode(file); |
0d66a487 | 442 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
7c272194 | 443 | int rc = 0; |
0d66a487 SW |
444 | int max = 0; |
445 | ||
83701246 YZ |
446 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
447 | return -EINVAL; | |
448 | ||
99ccbd22 MT |
449 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
450 | &nr_pages); | |
451 | ||
452 | if (rc == 0) | |
453 | goto out; | |
454 | ||
09cbfeaf KS |
455 | if (fsc->mount_options->rsize >= PAGE_SIZE) |
456 | max = (fsc->mount_options->rsize + PAGE_SIZE - 1) | |
0d66a487 | 457 | >> PAGE_SHIFT; |
7c272194 | 458 | |
2794a82a AE |
459 | dout("readpages %p file %p nr_pages %d max %d\n", inode, |
460 | file, nr_pages, | |
0d66a487 | 461 | max); |
7c272194 | 462 | while (!list_empty(page_list)) { |
0d66a487 | 463 | rc = start_read(inode, page_list, max); |
7c272194 SW |
464 | if (rc < 0) |
465 | goto out; | |
7c272194 | 466 | } |
1d3576fd | 467 | out: |
76be778b MT |
468 | ceph_fscache_readpages_cancel(inode, page_list); |
469 | ||
7c272194 | 470 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
471 | return rc; |
472 | } | |
473 | ||
474 | /* | |
475 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
476 | * only snap context we are allowed to write back. | |
1d3576fd | 477 | */ |
6298a337 | 478 | static struct ceph_snap_context *get_oldest_context(struct inode *inode, |
5f743e45 YZ |
479 | loff_t *snap_size, |
480 | u64 *truncate_size, | |
481 | u32 *truncate_seq) | |
1d3576fd SW |
482 | { |
483 | struct ceph_inode_info *ci = ceph_inode(inode); | |
484 | struct ceph_snap_context *snapc = NULL; | |
485 | struct ceph_cap_snap *capsnap = NULL; | |
486 | ||
be655596 | 487 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
488 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
489 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
490 | capsnap->context, capsnap->dirty_pages); | |
491 | if (capsnap->dirty_pages) { | |
492 | snapc = ceph_get_snap_context(capsnap->context); | |
493 | if (snap_size) | |
494 | *snap_size = capsnap->size; | |
5f743e45 YZ |
495 | if (truncate_size) |
496 | *truncate_size = capsnap->truncate_size; | |
497 | if (truncate_seq) | |
498 | *truncate_seq = capsnap->truncate_seq; | |
1d3576fd SW |
499 | break; |
500 | } | |
501 | } | |
7d8cb26d | 502 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 503 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
504 | dout(" head snapc %p has %d dirty pages\n", |
505 | snapc, ci->i_wrbuffer_ref_head); | |
5f743e45 | 506 | if (truncate_size) |
84fcc2d2 | 507 | *truncate_size = ci->i_truncate_size; |
5f743e45 | 508 | if (truncate_seq) |
84fcc2d2 | 509 | *truncate_seq = ci->i_truncate_seq; |
1d3576fd | 510 | } |
be655596 | 511 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
512 | return snapc; |
513 | } | |
514 | ||
515 | /* | |
516 | * Write a single page, but leave the page locked. | |
517 | * | |
518 | * If we get a write error, set the page error bit, but still adjust the | |
519 | * dirty page accounting (i.e., page is no longer dirty). | |
520 | */ | |
521 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
522 | { | |
523 | struct inode *inode; | |
524 | struct ceph_inode_info *ci; | |
3d14c5d2 | 525 | struct ceph_fs_client *fsc; |
1d3576fd | 526 | struct ceph_osd_client *osdc; |
6298a337 | 527 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 528 | loff_t page_off = page_offset(page); |
e1966b49 | 529 | loff_t snap_size = -1; |
2baba250 | 530 | long writeback_stat; |
e1966b49 | 531 | u64 truncate_size; |
fc2744aa | 532 | u32 truncate_seq; |
43986881 | 533 | int err, len = PAGE_SIZE; |
1d3576fd SW |
534 | |
535 | dout("writepage %p idx %lu\n", page, page->index); | |
536 | ||
1d3576fd SW |
537 | inode = page->mapping->host; |
538 | ci = ceph_inode(inode); | |
3d14c5d2 YS |
539 | fsc = ceph_inode_to_client(inode); |
540 | osdc = &fsc->client->osdc; | |
1d3576fd SW |
541 | |
542 | /* verify this is a writeable snap context */ | |
61600ef8 | 543 | snapc = page_snap_context(page); |
1d3576fd SW |
544 | if (snapc == NULL) { |
545 | dout("writepage %p page %p not dirty?\n", inode, page); | |
43986881 | 546 | return 0; |
1d3576fd | 547 | } |
5f743e45 YZ |
548 | oldest = get_oldest_context(inode, &snap_size, |
549 | &truncate_size, &truncate_seq); | |
6298a337 | 550 | if (snapc->seq > oldest->seq) { |
1d3576fd | 551 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 552 | inode, page, snapc); |
1d3576fd | 553 | /* we should only noop if called by kswapd */ |
fa71fefb | 554 | WARN_ON(!(current->flags & PF_MEMALLOC)); |
6298a337 | 555 | ceph_put_snap_context(oldest); |
fa71fefb | 556 | redirty_page_for_writepage(wbc, page); |
43986881 | 557 | return 0; |
1d3576fd | 558 | } |
6298a337 | 559 | ceph_put_snap_context(oldest); |
1d3576fd | 560 | |
e1966b49 | 561 | if (snap_size == -1) |
fc2744aa | 562 | snap_size = i_size_read(inode); |
fc2744aa | 563 | |
1d3576fd | 564 | /* is this a partial page at end of file? */ |
fc2744aa YZ |
565 | if (page_off >= snap_size) { |
566 | dout("%p page eof %llu\n", page, snap_size); | |
43986881 | 567 | return 0; |
fc2744aa | 568 | } |
43986881 | 569 | |
fc2744aa YZ |
570 | if (snap_size < page_off + len) |
571 | len = snap_size - page_off; | |
1d3576fd | 572 | |
ae00d4f3 SW |
573 | dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", |
574 | inode, page, page->index, page_off, len, snapc); | |
1d3576fd | 575 | |
3d14c5d2 | 576 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
2baba250 | 577 | if (writeback_stat > |
3d14c5d2 | 578 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
09dc9fc2 | 579 | set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
2baba250 | 580 | |
1d3576fd SW |
581 | set_page_writeback(page); |
582 | err = ceph_osdc_writepages(osdc, ceph_vino(inode), | |
583 | &ci->i_layout, snapc, | |
584 | page_off, len, | |
fc2744aa | 585 | truncate_seq, truncate_size, |
24808826 | 586 | &inode->i_mtime, &page, 1); |
1d3576fd | 587 | if (err < 0) { |
ad15ec06 YZ |
588 | struct writeback_control tmp_wbc; |
589 | if (!wbc) | |
590 | wbc = &tmp_wbc; | |
591 | if (err == -ERESTARTSYS) { | |
592 | /* killed by SIGKILL */ | |
593 | dout("writepage interrupted page %p\n", page); | |
594 | redirty_page_for_writepage(wbc, page); | |
595 | end_page_writeback(page); | |
43986881 | 596 | return err; |
ad15ec06 YZ |
597 | } |
598 | dout("writepage setting page/mapping error %d %p\n", | |
599 | err, page); | |
1d3576fd SW |
600 | SetPageError(page); |
601 | mapping_set_error(&inode->i_data, err); | |
ad15ec06 | 602 | wbc->pages_skipped++; |
1d3576fd SW |
603 | } else { |
604 | dout("writepage cleaned page %p\n", page); | |
605 | err = 0; /* vfs expects us to return 0 */ | |
606 | } | |
607 | page->private = 0; | |
608 | ClearPagePrivate(page); | |
609 | end_page_writeback(page); | |
610 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 611 | ceph_put_snap_context(snapc); /* page's reference */ |
1d3576fd SW |
612 | return err; |
613 | } | |
614 | ||
615 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
616 | { | |
dbd646a8 YS |
617 | int err; |
618 | struct inode *inode = page->mapping->host; | |
619 | BUG_ON(!inode); | |
70b666c3 | 620 | ihold(inode); |
dbd646a8 | 621 | err = writepage_nounlock(page, wbc); |
ad15ec06 YZ |
622 | if (err == -ERESTARTSYS) { |
623 | /* direct memory reclaimer was killed by SIGKILL. return 0 | |
624 | * to prevent caller from setting mapping/page error */ | |
625 | err = 0; | |
626 | } | |
1d3576fd | 627 | unlock_page(page); |
dbd646a8 | 628 | iput(inode); |
1d3576fd SW |
629 | return err; |
630 | } | |
631 | ||
1d3576fd SW |
632 | /* |
633 | * lame release_pages helper. release_pages() isn't exported to | |
634 | * modules. | |
635 | */ | |
636 | static void ceph_release_pages(struct page **pages, int num) | |
637 | { | |
638 | struct pagevec pvec; | |
639 | int i; | |
640 | ||
641 | pagevec_init(&pvec, 0); | |
642 | for (i = 0; i < num; i++) { | |
643 | if (pagevec_add(&pvec, pages[i]) == 0) | |
644 | pagevec_release(&pvec); | |
645 | } | |
646 | pagevec_release(&pvec); | |
647 | } | |
648 | ||
1d3576fd SW |
649 | /* |
650 | * async writeback completion handler. | |
651 | * | |
652 | * If we get an error, set the mapping error bit, but not the individual | |
653 | * page error bits. | |
654 | */ | |
85e084fe | 655 | static void writepages_finish(struct ceph_osd_request *req) |
1d3576fd SW |
656 | { |
657 | struct inode *inode = req->r_inode; | |
1d3576fd | 658 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 659 | struct ceph_osd_data *osd_data; |
1d3576fd | 660 | struct page *page; |
5b64640c YZ |
661 | int num_pages, total_pages = 0; |
662 | int i, j; | |
663 | int rc = req->r_result; | |
1d3576fd SW |
664 | struct ceph_snap_context *snapc = req->r_snapc; |
665 | struct address_space *mapping = inode->i_mapping; | |
3d14c5d2 | 666 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
5b64640c | 667 | bool remove_page; |
1d3576fd | 668 | |
5b64640c | 669 | dout("writepages_finish %p rc %d\n", inode, rc); |
26544c62 | 670 | if (rc < 0) { |
1d3576fd | 671 | mapping_set_error(mapping, rc); |
26544c62 JL |
672 | ceph_set_error_write(ci); |
673 | } else { | |
674 | ceph_clear_error_write(ci); | |
675 | } | |
5b64640c YZ |
676 | |
677 | /* | |
678 | * We lost the cache cap, need to truncate the page before | |
679 | * it is unlocked, otherwise we'd truncate it later in the | |
680 | * page truncation thread, possibly losing some data that | |
681 | * raced its way in | |
682 | */ | |
683 | remove_page = !(ceph_caps_issued(ci) & | |
684 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); | |
1d3576fd SW |
685 | |
686 | /* clean all pages */ | |
5b64640c YZ |
687 | for (i = 0; i < req->r_num_ops; i++) { |
688 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) | |
689 | break; | |
e63dc5c7 | 690 | |
5b64640c YZ |
691 | osd_data = osd_req_op_extent_osd_data(req, i); |
692 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); | |
693 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
694 | (u64)osd_data->length); | |
695 | total_pages += num_pages; | |
696 | for (j = 0; j < num_pages; j++) { | |
697 | page = osd_data->pages[j]; | |
698 | BUG_ON(!page); | |
699 | WARN_ON(!PageUptodate(page)); | |
700 | ||
701 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
702 | CONGESTION_OFF_THRESH( | |
703 | fsc->mount_options->congestion_kb)) | |
09dc9fc2 | 704 | clear_bdi_congested(inode_to_bdi(inode), |
5b64640c YZ |
705 | BLK_RW_ASYNC); |
706 | ||
707 | ceph_put_snap_context(page_snap_context(page)); | |
708 | page->private = 0; | |
709 | ClearPagePrivate(page); | |
710 | dout("unlocking %p\n", page); | |
711 | end_page_writeback(page); | |
712 | ||
713 | if (remove_page) | |
714 | generic_error_remove_page(inode->i_mapping, | |
715 | page); | |
716 | ||
717 | unlock_page(page); | |
718 | } | |
719 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", | |
720 | inode, osd_data->length, rc >= 0 ? num_pages : 0); | |
e63dc5c7 | 721 | |
5b64640c | 722 | ceph_release_pages(osd_data->pages, num_pages); |
1d3576fd | 723 | } |
1d3576fd | 724 | |
5b64640c YZ |
725 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
726 | ||
727 | osd_data = osd_req_op_extent_osd_data(req, 0); | |
87060c10 AE |
728 | if (osd_data->pages_from_pool) |
729 | mempool_free(osd_data->pages, | |
640ef79d | 730 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
1d3576fd | 731 | else |
87060c10 | 732 | kfree(osd_data->pages); |
1d3576fd SW |
733 | ceph_osdc_put_request(req); |
734 | } | |
735 | ||
1d3576fd SW |
736 | /* |
737 | * initiate async writeback | |
738 | */ | |
739 | static int ceph_writepages_start(struct address_space *mapping, | |
740 | struct writeback_control *wbc) | |
741 | { | |
742 | struct inode *inode = mapping->host; | |
1d3576fd | 743 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
744 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
745 | struct ceph_vino vino = ceph_vino(inode); | |
1d3576fd SW |
746 | pgoff_t index, start, end; |
747 | int range_whole = 0; | |
748 | int should_loop = 1; | |
749 | pgoff_t max_pages = 0, max_pages_ever = 0; | |
80e755fe | 750 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd SW |
751 | struct pagevec pvec; |
752 | int done = 0; | |
753 | int rc = 0; | |
93407472 | 754 | unsigned int wsize = i_blocksize(inode); |
1d3576fd | 755 | struct ceph_osd_request *req = NULL; |
021b77be | 756 | int do_sync = 0; |
e1966b49 YZ |
757 | loff_t snap_size, i_size; |
758 | u64 truncate_size; | |
fc2744aa | 759 | u32 truncate_seq; |
1d3576fd SW |
760 | |
761 | /* | |
762 | * Include a 'sync' in the OSD request if this is a data | |
763 | * integrity write (e.g., O_SYNC write or fsync()), or if our | |
764 | * cap is being revoked. | |
765 | */ | |
c62988ec | 766 | if ((wbc->sync_mode == WB_SYNC_ALL) || |
767 | ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) | |
1d3576fd SW |
768 | do_sync = 1; |
769 | dout("writepages_start %p dosync=%d (mode=%s)\n", | |
770 | inode, do_sync, | |
771 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : | |
772 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
773 | ||
52953d55 | 774 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
775 | if (ci->i_wrbuffer_ref > 0) { |
776 | pr_warn_ratelimited( | |
777 | "writepage_start %p %lld forced umount\n", | |
778 | inode, ceph_ino(inode)); | |
779 | } | |
a341d4df | 780 | mapping_set_error(mapping, -EIO); |
1d3576fd SW |
781 | return -EIO; /* we're in a forced umount, don't write! */ |
782 | } | |
3d14c5d2 YS |
783 | if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) |
784 | wsize = fsc->mount_options->wsize; | |
09cbfeaf KS |
785 | if (wsize < PAGE_SIZE) |
786 | wsize = PAGE_SIZE; | |
787 | max_pages_ever = wsize >> PAGE_SHIFT; | |
1d3576fd SW |
788 | |
789 | pagevec_init(&pvec, 0); | |
790 | ||
1d3576fd SW |
791 | /* where to start/end? */ |
792 | if (wbc->range_cyclic) { | |
793 | start = mapping->writeback_index; /* Start from prev offset */ | |
794 | end = -1; | |
795 | dout(" cyclic, start at %lu\n", start); | |
796 | } else { | |
09cbfeaf KS |
797 | start = wbc->range_start >> PAGE_SHIFT; |
798 | end = wbc->range_end >> PAGE_SHIFT; | |
1d3576fd SW |
799 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
800 | range_whole = 1; | |
801 | should_loop = 0; | |
802 | dout(" not cyclic, %lu to %lu\n", start, end); | |
803 | } | |
804 | index = start; | |
805 | ||
806 | retry: | |
807 | /* find oldest snap context with dirty data */ | |
808 | ceph_put_snap_context(snapc); | |
e1966b49 | 809 | snap_size = -1; |
5f743e45 YZ |
810 | snapc = get_oldest_context(inode, &snap_size, |
811 | &truncate_size, &truncate_seq); | |
1d3576fd SW |
812 | if (!snapc) { |
813 | /* hmm, why does writepages get called when there | |
814 | is no dirty data? */ | |
815 | dout(" no snap context with dirty data?\n"); | |
816 | goto out; | |
817 | } | |
818 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", | |
819 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa | 820 | |
e1966b49 | 821 | i_size = i_size_read(inode); |
fc2744aa | 822 | |
1d3576fd SW |
823 | if (last_snapc && snapc != last_snapc) { |
824 | /* if we switched to a newer snapc, restart our scan at the | |
825 | * start of the original file range. */ | |
826 | dout(" snapc differs from last pass, restarting at %lu\n", | |
827 | index); | |
828 | index = start; | |
829 | } | |
830 | last_snapc = snapc; | |
831 | ||
832 | while (!done && index <= end) { | |
833 | unsigned i; | |
834 | int first; | |
5b64640c YZ |
835 | pgoff_t strip_unit_end = 0; |
836 | int num_ops = 0, op_idx; | |
837 | int pvec_pages, locked_pages = 0; | |
838 | struct page **pages = NULL, **data_pages; | |
e5975c7c | 839 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
1d3576fd SW |
840 | struct page *page; |
841 | int want; | |
5b64640c | 842 | u64 offset = 0, len = 0; |
1d3576fd | 843 | |
1d3576fd SW |
844 | max_pages = max_pages_ever; |
845 | ||
846 | get_more_pages: | |
847 | first = -1; | |
848 | want = min(end - index, | |
849 | min((pgoff_t)PAGEVEC_SIZE, | |
850 | max_pages - (pgoff_t)locked_pages) - 1) | |
851 | + 1; | |
852 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
853 | PAGECACHE_TAG_DIRTY, | |
854 | want); | |
855 | dout("pagevec_lookup_tag got %d\n", pvec_pages); | |
856 | if (!pvec_pages && !locked_pages) | |
857 | break; | |
858 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
859 | page = pvec.pages[i]; | |
860 | dout("? %p idx %lu\n", page, page->index); | |
861 | if (locked_pages == 0) | |
862 | lock_page(page); /* first page */ | |
863 | else if (!trylock_page(page)) | |
864 | break; | |
865 | ||
866 | /* only dirty pages, or our accounting breaks */ | |
867 | if (unlikely(!PageDirty(page)) || | |
868 | unlikely(page->mapping != mapping)) { | |
869 | dout("!dirty or !mapping %p\n", page); | |
870 | unlock_page(page); | |
871 | break; | |
872 | } | |
873 | if (!wbc->range_cyclic && page->index > end) { | |
874 | dout("end of range %p\n", page); | |
875 | done = 1; | |
876 | unlock_page(page); | |
877 | break; | |
878 | } | |
5b64640c YZ |
879 | if (strip_unit_end && (page->index > strip_unit_end)) { |
880 | dout("end of strip unit %p\n", page); | |
1d3576fd SW |
881 | unlock_page(page); |
882 | break; | |
883 | } | |
884 | if (wbc->sync_mode != WB_SYNC_NONE) { | |
885 | dout("waiting on writeback %p\n", page); | |
886 | wait_on_page_writeback(page); | |
887 | } | |
e1966b49 YZ |
888 | if (page_offset(page) >= |
889 | (snap_size == -1 ? i_size : snap_size)) { | |
890 | dout("%p page eof %llu\n", page, | |
891 | (snap_size == -1 ? i_size : snap_size)); | |
1d3576fd SW |
892 | done = 1; |
893 | unlock_page(page); | |
894 | break; | |
895 | } | |
896 | if (PageWriteback(page)) { | |
897 | dout("%p under writeback\n", page); | |
898 | unlock_page(page); | |
899 | break; | |
900 | } | |
901 | ||
902 | /* only if matching snap context */ | |
61600ef8 | 903 | pgsnapc = page_snap_context(page); |
80e755fe SW |
904 | if (pgsnapc->seq > snapc->seq) { |
905 | dout("page snapc %p %lld > oldest %p %lld\n", | |
906 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); | |
1d3576fd SW |
907 | unlock_page(page); |
908 | if (!locked_pages) | |
909 | continue; /* keep looking for snap */ | |
910 | break; | |
911 | } | |
912 | ||
913 | if (!clear_page_dirty_for_io(page)) { | |
914 | dout("%p !clear_page_dirty_for_io\n", page); | |
915 | unlock_page(page); | |
916 | break; | |
917 | } | |
918 | ||
e5975c7c AE |
919 | /* |
920 | * We have something to write. If this is | |
921 | * the first locked page this time through, | |
5b64640c YZ |
922 | * calculate max possinle write size and |
923 | * allocate a page array | |
e5975c7c | 924 | */ |
1d3576fd | 925 | if (locked_pages == 0) { |
5b64640c YZ |
926 | u64 objnum; |
927 | u64 objoff; | |
928 | ||
1d3576fd | 929 | /* prepare async write request */ |
e5975c7c | 930 | offset = (u64)page_offset(page); |
1d3576fd | 931 | len = wsize; |
5b64640c YZ |
932 | |
933 | rc = ceph_calc_file_object_mapping(&ci->i_layout, | |
934 | offset, len, | |
935 | &objnum, &objoff, | |
936 | &len); | |
937 | if (rc < 0) { | |
8c71897b HC |
938 | unlock_page(page); |
939 | break; | |
940 | } | |
941 | ||
5b64640c YZ |
942 | num_ops = 1 + do_sync; |
943 | strip_unit_end = page->index + | |
09cbfeaf | 944 | ((len - 1) >> PAGE_SHIFT); |
88486957 | 945 | |
5b64640c | 946 | BUG_ON(pages); |
88486957 | 947 | max_pages = calc_pages_for(0, (u64)len); |
fc2744aa YZ |
948 | pages = kmalloc(max_pages * sizeof (*pages), |
949 | GFP_NOFS); | |
88486957 AE |
950 | if (!pages) { |
951 | pool = fsc->wb_pagevec_pool; | |
88486957 | 952 | pages = mempool_alloc(pool, GFP_NOFS); |
e5975c7c | 953 | BUG_ON(!pages); |
88486957 | 954 | } |
5b64640c YZ |
955 | |
956 | len = 0; | |
957 | } else if (page->index != | |
09cbfeaf | 958 | (offset + len) >> PAGE_SHIFT) { |
5b64640c YZ |
959 | if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : |
960 | CEPH_OSD_MAX_OPS)) { | |
961 | redirty_page_for_writepage(wbc, page); | |
962 | unlock_page(page); | |
963 | break; | |
964 | } | |
965 | ||
966 | num_ops++; | |
967 | offset = (u64)page_offset(page); | |
968 | len = 0; | |
1d3576fd SW |
969 | } |
970 | ||
971 | /* note position of first page in pvec */ | |
972 | if (first < 0) | |
973 | first = i; | |
974 | dout("%p will write page %p idx %lu\n", | |
975 | inode, page, page->index); | |
2baba250 | 976 | |
5b64640c YZ |
977 | if (atomic_long_inc_return(&fsc->writeback_count) > |
978 | CONGESTION_ON_THRESH( | |
3d14c5d2 | 979 | fsc->mount_options->congestion_kb)) { |
09dc9fc2 | 980 | set_bdi_congested(inode_to_bdi(inode), |
213c99ee | 981 | BLK_RW_ASYNC); |
2baba250 YS |
982 | } |
983 | ||
e5975c7c | 984 | pages[locked_pages] = page; |
1d3576fd | 985 | locked_pages++; |
09cbfeaf | 986 | len += PAGE_SIZE; |
1d3576fd SW |
987 | } |
988 | ||
989 | /* did we get anything? */ | |
990 | if (!locked_pages) | |
991 | goto release_pvec_pages; | |
992 | if (i) { | |
993 | int j; | |
994 | BUG_ON(!locked_pages || first < 0); | |
995 | ||
996 | if (pvec_pages && i == pvec_pages && | |
997 | locked_pages < max_pages) { | |
998 | dout("reached end pvec, trying for more\n"); | |
999 | pagevec_reinit(&pvec); | |
1000 | goto get_more_pages; | |
1001 | } | |
1002 | ||
1003 | /* shift unused pages over in the pvec... we | |
1004 | * will need to release them below. */ | |
1005 | for (j = i; j < pvec_pages; j++) { | |
5b64640c | 1006 | dout(" pvec leftover page %p\n", pvec.pages[j]); |
1d3576fd SW |
1007 | pvec.pages[j-i+first] = pvec.pages[j]; |
1008 | } | |
1009 | pvec.nr -= i-first; | |
1010 | } | |
1011 | ||
5b64640c | 1012 | new_request: |
e5975c7c | 1013 | offset = page_offset(pages[0]); |
5b64640c YZ |
1014 | len = wsize; |
1015 | ||
1016 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1017 | &ci->i_layout, vino, | |
1018 | offset, &len, 0, num_ops, | |
1019 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1020 | CEPH_OSD_FLAG_WRITE, |
5b64640c YZ |
1021 | snapc, truncate_seq, |
1022 | truncate_size, false); | |
1023 | if (IS_ERR(req)) { | |
1024 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1025 | &ci->i_layout, vino, | |
1026 | offset, &len, 0, | |
1027 | min(num_ops, | |
1028 | CEPH_OSD_SLAB_OPS), | |
1029 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1030 | CEPH_OSD_FLAG_WRITE, |
5b64640c YZ |
1031 | snapc, truncate_seq, |
1032 | truncate_size, true); | |
1033 | BUG_ON(IS_ERR(req)); | |
e1966b49 | 1034 | } |
5b64640c | 1035 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
09cbfeaf | 1036 | PAGE_SIZE - offset); |
5b64640c YZ |
1037 | |
1038 | req->r_callback = writepages_finish; | |
1039 | req->r_inode = inode; | |
1d3576fd | 1040 | |
5b64640c YZ |
1041 | /* Format the osd request message and submit the write */ |
1042 | len = 0; | |
1043 | data_pages = pages; | |
1044 | op_idx = 0; | |
1045 | for (i = 0; i < locked_pages; i++) { | |
1046 | u64 cur_offset = page_offset(pages[i]); | |
1047 | if (offset + len != cur_offset) { | |
1048 | if (op_idx + do_sync + 1 == req->r_num_ops) | |
1049 | break; | |
1050 | osd_req_op_extent_dup_last(req, op_idx, | |
1051 | cur_offset - offset); | |
1052 | dout("writepages got pages at %llu~%llu\n", | |
1053 | offset, len); | |
1054 | osd_req_op_extent_osd_data_pages(req, op_idx, | |
1055 | data_pages, len, 0, | |
a4ce40a9 | 1056 | !!pool, false); |
5b64640c | 1057 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1058 | |
5b64640c YZ |
1059 | len = 0; |
1060 | offset = cur_offset; | |
1061 | data_pages = pages + i; | |
1062 | op_idx++; | |
1063 | } | |
1064 | ||
1065 | set_page_writeback(pages[i]); | |
09cbfeaf | 1066 | len += PAGE_SIZE; |
5b64640c YZ |
1067 | } |
1068 | ||
1069 | if (snap_size != -1) { | |
1070 | len = min(len, snap_size - offset); | |
1071 | } else if (i == locked_pages) { | |
1072 | /* writepages_finish() clears writeback pages | |
1073 | * according to the data length, so make sure | |
1074 | * data length covers all locked pages */ | |
09cbfeaf | 1075 | u64 min_len = len + 1 - PAGE_SIZE; |
5b64640c YZ |
1076 | len = min(len, (u64)i_size_read(inode) - offset); |
1077 | len = max(len, min_len); | |
1078 | } | |
1079 | dout("writepages got pages at %llu~%llu\n", offset, len); | |
e5975c7c | 1080 | |
5b64640c YZ |
1081 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
1082 | 0, !!pool, false); | |
1083 | osd_req_op_extent_update(req, op_idx, len); | |
e5975c7c | 1084 | |
5b64640c YZ |
1085 | if (do_sync) { |
1086 | op_idx++; | |
1087 | osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); | |
1088 | } | |
1089 | BUG_ON(op_idx + 1 != req->r_num_ops); | |
1090 | ||
1091 | pool = NULL; | |
1092 | if (i < locked_pages) { | |
1093 | BUG_ON(num_ops <= req->r_num_ops); | |
1094 | num_ops -= req->r_num_ops; | |
1095 | num_ops += do_sync; | |
1096 | locked_pages -= i; | |
1097 | ||
1098 | /* allocate new pages array for next request */ | |
1099 | data_pages = pages; | |
1100 | pages = kmalloc(locked_pages * sizeof (*pages), | |
1101 | GFP_NOFS); | |
1102 | if (!pages) { | |
1103 | pool = fsc->wb_pagevec_pool; | |
1104 | pages = mempool_alloc(pool, GFP_NOFS); | |
1105 | BUG_ON(!pages); | |
1106 | } | |
1107 | memcpy(pages, data_pages + i, | |
1108 | locked_pages * sizeof(*pages)); | |
1109 | memset(data_pages + i, 0, | |
1110 | locked_pages * sizeof(*pages)); | |
1111 | } else { | |
1112 | BUG_ON(num_ops != req->r_num_ops); | |
1113 | index = pages[i - 1]->index + 1; | |
1114 | /* request message now owns the pages array */ | |
1115 | pages = NULL; | |
1116 | } | |
e5975c7c | 1117 | |
bb873b53 | 1118 | req->r_mtime = inode->i_mtime; |
9d6fcb08 SW |
1119 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
1120 | BUG_ON(rc); | |
1d3576fd SW |
1121 | req = NULL; |
1122 | ||
5b64640c YZ |
1123 | wbc->nr_to_write -= i; |
1124 | if (pages) | |
1125 | goto new_request; | |
1126 | ||
1d3576fd SW |
1127 | if (wbc->nr_to_write <= 0) |
1128 | done = 1; | |
1129 | ||
1130 | release_pvec_pages: | |
1131 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
1132 | pvec.nr ? pvec.pages[0] : NULL); | |
1133 | pagevec_release(&pvec); | |
1134 | ||
1135 | if (locked_pages && !done) | |
1136 | goto retry; | |
1137 | } | |
1138 | ||
1139 | if (should_loop && !done) { | |
1140 | /* more to do; loop back to beginning of file */ | |
1141 | dout("writepages looping back to beginning of file\n"); | |
1142 | should_loop = 0; | |
1143 | index = 0; | |
1144 | goto retry; | |
1145 | } | |
1146 | ||
1147 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1148 | mapping->writeback_index = index; | |
1149 | ||
1150 | out: | |
3ed97d63 | 1151 | ceph_osdc_put_request(req); |
1d3576fd SW |
1152 | ceph_put_snap_context(snapc); |
1153 | dout("writepages done, rc = %d\n", rc); | |
1d3576fd SW |
1154 | return rc; |
1155 | } | |
1156 | ||
1157 | ||
1158 | ||
1159 | /* | |
1160 | * See if a given @snapc is either writeable, or already written. | |
1161 | */ | |
1162 | static int context_is_writeable_or_written(struct inode *inode, | |
1163 | struct ceph_snap_context *snapc) | |
1164 | { | |
5f743e45 YZ |
1165 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, |
1166 | NULL, NULL); | |
6298a337 SW |
1167 | int ret = !oldest || snapc->seq <= oldest->seq; |
1168 | ||
1169 | ceph_put_snap_context(oldest); | |
1170 | return ret; | |
1d3576fd SW |
1171 | } |
1172 | ||
1173 | /* | |
1174 | * We are only allowed to write into/dirty the page if the page is | |
1175 | * clean, or already dirty within the same snap context. | |
8f883c24 SW |
1176 | * |
1177 | * called with page locked. | |
1178 | * return success with page locked, | |
1179 | * or any failure (incl -EAGAIN) with page unlocked. | |
1d3576fd | 1180 | */ |
4af6b225 YS |
1181 | static int ceph_update_writeable_page(struct file *file, |
1182 | loff_t pos, unsigned len, | |
1183 | struct page *page) | |
1d3576fd | 1184 | { |
496ad9aa | 1185 | struct inode *inode = file_inode(file); |
6c93df5d | 1186 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 1187 | struct ceph_inode_info *ci = ceph_inode(inode); |
09cbfeaf KS |
1188 | loff_t page_off = pos & PAGE_MASK; |
1189 | int pos_in_page = pos & ~PAGE_MASK; | |
1d3576fd SW |
1190 | int end_in_page = pos_in_page + len; |
1191 | loff_t i_size; | |
1d3576fd | 1192 | int r; |
80e755fe | 1193 | struct ceph_snap_context *snapc, *oldest; |
1d3576fd | 1194 | |
52953d55 | 1195 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
1196 | dout(" page %p forced umount\n", page); |
1197 | unlock_page(page); | |
1198 | return -EIO; | |
1199 | } | |
1200 | ||
1d3576fd SW |
1201 | retry_locked: |
1202 | /* writepages currently holds page lock, but if we change that later, */ | |
1203 | wait_on_page_writeback(page); | |
1204 | ||
61600ef8 | 1205 | snapc = page_snap_context(page); |
80e755fe | 1206 | if (snapc && snapc != ci->i_head_snapc) { |
1d3576fd SW |
1207 | /* |
1208 | * this page is already dirty in another (older) snap | |
1209 | * context! is it writeable now? | |
1210 | */ | |
5f743e45 | 1211 | oldest = get_oldest_context(inode, NULL, NULL, NULL); |
1d3576fd | 1212 | |
80e755fe | 1213 | if (snapc->seq > oldest->seq) { |
6298a337 | 1214 | ceph_put_snap_context(oldest); |
1d3576fd | 1215 | dout(" page %p snapc %p not current or oldest\n", |
6298a337 | 1216 | page, snapc); |
1d3576fd SW |
1217 | /* |
1218 | * queue for writeback, and wait for snapc to | |
1219 | * be writeable or written | |
1220 | */ | |
6298a337 | 1221 | snapc = ceph_get_snap_context(snapc); |
1d3576fd | 1222 | unlock_page(page); |
3c6f6b79 | 1223 | ceph_queue_writeback(inode); |
a78bbd4b | 1224 | r = wait_event_killable(ci->i_cap_wq, |
1d3576fd SW |
1225 | context_is_writeable_or_written(inode, snapc)); |
1226 | ceph_put_snap_context(snapc); | |
8f883c24 SW |
1227 | if (r == -ERESTARTSYS) |
1228 | return r; | |
4af6b225 | 1229 | return -EAGAIN; |
1d3576fd | 1230 | } |
6298a337 | 1231 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1232 | |
1233 | /* yay, writeable, do it now (without dropping page lock) */ | |
1234 | dout(" page %p snapc %p not current, but oldest\n", | |
1235 | page, snapc); | |
1236 | if (!clear_page_dirty_for_io(page)) | |
1237 | goto retry_locked; | |
1238 | r = writepage_nounlock(page, NULL); | |
1239 | if (r < 0) | |
1240 | goto fail_nosnap; | |
1241 | goto retry_locked; | |
1242 | } | |
1243 | ||
1244 | if (PageUptodate(page)) { | |
1245 | dout(" page %p already uptodate\n", page); | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | /* full page? */ | |
09cbfeaf | 1250 | if (pos_in_page == 0 && len == PAGE_SIZE) |
1d3576fd SW |
1251 | return 0; |
1252 | ||
1253 | /* past end of file? */ | |
99c88e69 | 1254 | i_size = i_size_read(inode); |
1d3576fd | 1255 | |
1d3576fd SW |
1256 | if (page_off >= i_size || |
1257 | (pos_in_page == 0 && (pos+len) >= i_size && | |
09cbfeaf | 1258 | end_in_page - pos_in_page != PAGE_SIZE)) { |
1d3576fd | 1259 | dout(" zeroing %p 0 - %d and %d - %d\n", |
09cbfeaf | 1260 | page, pos_in_page, end_in_page, (int)PAGE_SIZE); |
1d3576fd SW |
1261 | zero_user_segments(page, |
1262 | 0, pos_in_page, | |
09cbfeaf | 1263 | end_in_page, PAGE_SIZE); |
1d3576fd SW |
1264 | return 0; |
1265 | } | |
1266 | ||
1267 | /* we need to read it. */ | |
1d3576fd SW |
1268 | r = readpage_nounlock(file, page); |
1269 | if (r < 0) | |
1270 | goto fail_nosnap; | |
1271 | goto retry_locked; | |
1d3576fd SW |
1272 | fail_nosnap: |
1273 | unlock_page(page); | |
1274 | return r; | |
1275 | } | |
1276 | ||
4af6b225 YS |
1277 | /* |
1278 | * We are only allowed to write into/dirty the page if the page is | |
1279 | * clean, or already dirty within the same snap context. | |
1280 | */ | |
1281 | static int ceph_write_begin(struct file *file, struct address_space *mapping, | |
1282 | loff_t pos, unsigned len, unsigned flags, | |
1283 | struct page **pagep, void **fsdata) | |
1284 | { | |
496ad9aa | 1285 | struct inode *inode = file_inode(file); |
4af6b225 | 1286 | struct page *page; |
09cbfeaf | 1287 | pgoff_t index = pos >> PAGE_SHIFT; |
7971bd92 | 1288 | int r; |
4af6b225 YS |
1289 | |
1290 | do { | |
8f883c24 | 1291 | /* get a page */ |
4af6b225 | 1292 | page = grab_cache_page_write_begin(mapping, index, 0); |
7971bd92 SW |
1293 | if (!page) |
1294 | return -ENOMEM; | |
4af6b225 YS |
1295 | |
1296 | dout("write_begin file %p inode %p page %p %d~%d\n", file, | |
213c99ee | 1297 | inode, page, (int)pos, (int)len); |
4af6b225 YS |
1298 | |
1299 | r = ceph_update_writeable_page(file, pos, len, page); | |
c1d00b2d | 1300 | if (r < 0) |
09cbfeaf | 1301 | put_page(page); |
c1d00b2d TK |
1302 | else |
1303 | *pagep = page; | |
4af6b225 YS |
1304 | } while (r == -EAGAIN); |
1305 | ||
1306 | return r; | |
1307 | } | |
1308 | ||
1d3576fd SW |
1309 | /* |
1310 | * we don't do anything in here that simple_write_end doesn't do | |
5dda377c | 1311 | * except adjust dirty page accounting |
1d3576fd SW |
1312 | */ |
1313 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1314 | loff_t pos, unsigned len, unsigned copied, | |
1315 | struct page *page, void *fsdata) | |
1316 | { | |
496ad9aa | 1317 | struct inode *inode = file_inode(file); |
efb0ca76 | 1318 | bool check_cap = false; |
1d3576fd SW |
1319 | |
1320 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1321 | inode, page, (int)pos, (int)copied, (int)len); | |
1322 | ||
1323 | /* zero the stale part of the page if we did a short copy */ | |
b9de313c AV |
1324 | if (!PageUptodate(page)) { |
1325 | if (copied < len) { | |
1326 | copied = 0; | |
1327 | goto out; | |
1328 | } | |
1329 | SetPageUptodate(page); | |
1330 | } | |
1d3576fd SW |
1331 | |
1332 | /* did file size increase? */ | |
99c88e69 | 1333 | if (pos+copied > i_size_read(inode)) |
1d3576fd SW |
1334 | check_cap = ceph_inode_set_size(inode, pos+copied); |
1335 | ||
1d3576fd SW |
1336 | set_page_dirty(page); |
1337 | ||
b9de313c | 1338 | out: |
1d3576fd | 1339 | unlock_page(page); |
09cbfeaf | 1340 | put_page(page); |
1d3576fd SW |
1341 | |
1342 | if (check_cap) | |
1343 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1344 | ||
1345 | return copied; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * we set .direct_IO to indicate direct io is supported, but since we | |
1350 | * intercept O_DIRECT reads and writes early, this function should | |
1351 | * never get called. | |
1352 | */ | |
c8b8e32d | 1353 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
1d3576fd SW |
1354 | { |
1355 | WARN_ON(1); | |
1356 | return -EINVAL; | |
1357 | } | |
1358 | ||
1359 | const struct address_space_operations ceph_aops = { | |
1360 | .readpage = ceph_readpage, | |
1361 | .readpages = ceph_readpages, | |
1362 | .writepage = ceph_writepage, | |
1363 | .writepages = ceph_writepages_start, | |
1364 | .write_begin = ceph_write_begin, | |
1365 | .write_end = ceph_write_end, | |
1366 | .set_page_dirty = ceph_set_page_dirty, | |
1367 | .invalidatepage = ceph_invalidatepage, | |
1368 | .releasepage = ceph_releasepage, | |
1369 | .direct_IO = ceph_direct_io, | |
1370 | }; | |
1371 | ||
4f7e89f6 YZ |
1372 | static void ceph_block_sigs(sigset_t *oldset) |
1373 | { | |
1374 | sigset_t mask; | |
1375 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
1376 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
1377 | } | |
1378 | ||
1379 | static void ceph_restore_sigs(sigset_t *oldset) | |
1380 | { | |
1381 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
1382 | } | |
1d3576fd SW |
1383 | |
1384 | /* | |
1385 | * vm ops | |
1386 | */ | |
11bac800 | 1387 | static int ceph_filemap_fault(struct vm_fault *vmf) |
61f68816 | 1388 | { |
11bac800 | 1389 | struct vm_area_struct *vma = vmf->vma; |
61f68816 YZ |
1390 | struct inode *inode = file_inode(vma->vm_file); |
1391 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1392 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1393 | struct page *pinned_page = NULL; |
09cbfeaf | 1394 | loff_t off = vmf->pgoff << PAGE_SHIFT; |
61f68816 | 1395 | int want, got, ret; |
4f7e89f6 YZ |
1396 | sigset_t oldset; |
1397 | ||
1398 | ceph_block_sigs(&oldset); | |
61f68816 YZ |
1399 | |
1400 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
09cbfeaf | 1401 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
61f68816 YZ |
1402 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1403 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1404 | else | |
1405 | want = CEPH_CAP_FILE_CACHE; | |
4f7e89f6 YZ |
1406 | |
1407 | got = 0; | |
1408 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); | |
6ce026e4 | 1409 | if (ret < 0) |
4f7e89f6 | 1410 | goto out_restore; |
6ce026e4 | 1411 | |
61f68816 | 1412 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
09cbfeaf | 1413 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
61f68816 | 1414 | |
83701246 | 1415 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
2b1ac852 YZ |
1416 | ci->i_inline_version == CEPH_INLINE_NONE) { |
1417 | current->journal_info = vma->vm_file; | |
11bac800 | 1418 | ret = filemap_fault(vmf); |
2b1ac852 YZ |
1419 | current->journal_info = NULL; |
1420 | } else | |
83701246 | 1421 | ret = -EAGAIN; |
61f68816 YZ |
1422 | |
1423 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", | |
09cbfeaf | 1424 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); |
3738daa6 | 1425 | if (pinned_page) |
09cbfeaf | 1426 | put_page(pinned_page); |
61f68816 YZ |
1427 | ceph_put_cap_refs(ci, got); |
1428 | ||
83701246 | 1429 | if (ret != -EAGAIN) |
4f7e89f6 | 1430 | goto out_restore; |
83701246 YZ |
1431 | |
1432 | /* read inline data */ | |
09cbfeaf | 1433 | if (off >= PAGE_SIZE) { |
83701246 YZ |
1434 | /* does not support inline data > PAGE_SIZE */ |
1435 | ret = VM_FAULT_SIGBUS; | |
1436 | } else { | |
1437 | int ret1; | |
1438 | struct address_space *mapping = inode->i_mapping; | |
1439 | struct page *page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1440 | mapping_gfp_constraint(mapping, |
1441 | ~__GFP_FS)); | |
83701246 YZ |
1442 | if (!page) { |
1443 | ret = VM_FAULT_OOM; | |
4f7e89f6 | 1444 | goto out_inline; |
83701246 YZ |
1445 | } |
1446 | ret1 = __ceph_do_getattr(inode, page, | |
1447 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1448 | if (ret1 < 0 || off >= i_size_read(inode)) { | |
1449 | unlock_page(page); | |
09cbfeaf | 1450 | put_page(page); |
6ce026e4 YZ |
1451 | if (ret1 < 0) |
1452 | ret = ret1; | |
1453 | else | |
1454 | ret = VM_FAULT_SIGBUS; | |
4f7e89f6 | 1455 | goto out_inline; |
83701246 | 1456 | } |
09cbfeaf KS |
1457 | if (ret1 < PAGE_SIZE) |
1458 | zero_user_segment(page, ret1, PAGE_SIZE); | |
83701246 YZ |
1459 | else |
1460 | flush_dcache_page(page); | |
1461 | SetPageUptodate(page); | |
1462 | vmf->page = page; | |
1463 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
4f7e89f6 YZ |
1464 | out_inline: |
1465 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", | |
1466 | inode, off, (size_t)PAGE_SIZE, ret); | |
83701246 | 1467 | } |
4f7e89f6 YZ |
1468 | out_restore: |
1469 | ceph_restore_sigs(&oldset); | |
6ce026e4 YZ |
1470 | if (ret < 0) |
1471 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1472 | ||
61f68816 YZ |
1473 | return ret; |
1474 | } | |
1d3576fd SW |
1475 | |
1476 | /* | |
1477 | * Reuse write_begin here for simplicity. | |
1478 | */ | |
11bac800 | 1479 | static int ceph_page_mkwrite(struct vm_fault *vmf) |
1d3576fd | 1480 | { |
11bac800 | 1481 | struct vm_area_struct *vma = vmf->vma; |
496ad9aa | 1482 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1483 | struct ceph_inode_info *ci = ceph_inode(inode); |
1484 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
f66fd9f0 | 1485 | struct ceph_cap_flush *prealloc_cf; |
61f68816 | 1486 | struct page *page = vmf->page; |
6285bc23 | 1487 | loff_t off = page_offset(page); |
61f68816 YZ |
1488 | loff_t size = i_size_read(inode); |
1489 | size_t len; | |
1490 | int want, got, ret; | |
4f7e89f6 | 1491 | sigset_t oldset; |
3ca9c3bd | 1492 | |
f66fd9f0 YZ |
1493 | prealloc_cf = ceph_alloc_cap_flush(); |
1494 | if (!prealloc_cf) | |
6ce026e4 | 1495 | return VM_FAULT_OOM; |
f66fd9f0 | 1496 | |
4f7e89f6 | 1497 | ceph_block_sigs(&oldset); |
f66fd9f0 | 1498 | |
28127bdd YZ |
1499 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1500 | struct page *locked_page = NULL; | |
1501 | if (off == 0) { | |
1502 | lock_page(page); | |
1503 | locked_page = page; | |
1504 | } | |
1505 | ret = ceph_uninline_data(vma->vm_file, locked_page); | |
1506 | if (locked_page) | |
1507 | unlock_page(locked_page); | |
6ce026e4 | 1508 | if (ret < 0) |
f66fd9f0 | 1509 | goto out_free; |
28127bdd YZ |
1510 | } |
1511 | ||
09cbfeaf KS |
1512 | if (off + PAGE_SIZE <= size) |
1513 | len = PAGE_SIZE; | |
1d3576fd | 1514 | else |
09cbfeaf | 1515 | len = size & ~PAGE_MASK; |
1d3576fd | 1516 | |
61f68816 YZ |
1517 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1518 | inode, ceph_vinop(inode), off, len, size); | |
1519 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1520 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1521 | else | |
1522 | want = CEPH_CAP_FILE_BUFFER; | |
4f7e89f6 YZ |
1523 | |
1524 | got = 0; | |
1525 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, | |
1526 | &got, NULL); | |
6ce026e4 | 1527 | if (ret < 0) |
4f7e89f6 | 1528 | goto out_free; |
6ce026e4 | 1529 | |
61f68816 YZ |
1530 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
1531 | inode, off, len, ceph_cap_string(got)); | |
1532 | ||
1533 | /* Update time before taking page lock */ | |
1534 | file_update_time(vma->vm_file); | |
4af6b225 | 1535 | |
f0b33df5 YZ |
1536 | do { |
1537 | lock_page(page); | |
4af6b225 | 1538 | |
f0b33df5 YZ |
1539 | if ((off > size) || (page->mapping != inode->i_mapping)) { |
1540 | unlock_page(page); | |
1541 | ret = VM_FAULT_NOPAGE; | |
1542 | break; | |
1543 | } | |
1544 | ||
1545 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); | |
1546 | if (ret >= 0) { | |
1547 | /* success. we'll keep the page locked. */ | |
1548 | set_page_dirty(page); | |
1549 | ret = VM_FAULT_LOCKED; | |
1550 | } | |
1551 | } while (ret == -EAGAIN); | |
4af6b225 | 1552 | |
28127bdd YZ |
1553 | if (ret == VM_FAULT_LOCKED || |
1554 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1555 | int dirty; |
1556 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1557 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1558 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1559 | &prealloc_cf); | |
61f68816 YZ |
1560 | spin_unlock(&ci->i_ceph_lock); |
1561 | if (dirty) | |
1562 | __mark_inode_dirty(inode, dirty); | |
1563 | } | |
1564 | ||
1565 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", | |
1566 | inode, off, len, ceph_cap_string(got), ret); | |
1567 | ceph_put_cap_refs(ci, got); | |
f66fd9f0 | 1568 | out_free: |
4f7e89f6 | 1569 | ceph_restore_sigs(&oldset); |
f66fd9f0 | 1570 | ceph_free_cap_flush(prealloc_cf); |
6ce026e4 YZ |
1571 | if (ret < 0) |
1572 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1d3576fd SW |
1573 | return ret; |
1574 | } | |
1575 | ||
31c542a1 YZ |
1576 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1577 | char *data, size_t len) | |
1578 | { | |
1579 | struct address_space *mapping = inode->i_mapping; | |
1580 | struct page *page; | |
1581 | ||
1582 | if (locked_page) { | |
1583 | page = locked_page; | |
1584 | } else { | |
1585 | if (i_size_read(inode) == 0) | |
1586 | return; | |
1587 | page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1588 | mapping_gfp_constraint(mapping, |
1589 | ~__GFP_FS)); | |
31c542a1 YZ |
1590 | if (!page) |
1591 | return; | |
1592 | if (PageUptodate(page)) { | |
1593 | unlock_page(page); | |
09cbfeaf | 1594 | put_page(page); |
31c542a1 YZ |
1595 | return; |
1596 | } | |
1597 | } | |
1598 | ||
0668ff52 | 1599 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1600 | inode, ceph_vinop(inode), len, locked_page); |
1601 | ||
1602 | if (len > 0) { | |
1603 | void *kaddr = kmap_atomic(page); | |
1604 | memcpy(kaddr, data, len); | |
1605 | kunmap_atomic(kaddr); | |
1606 | } | |
1607 | ||
1608 | if (page != locked_page) { | |
09cbfeaf KS |
1609 | if (len < PAGE_SIZE) |
1610 | zero_user_segment(page, len, PAGE_SIZE); | |
31c542a1 YZ |
1611 | else |
1612 | flush_dcache_page(page); | |
1613 | ||
1614 | SetPageUptodate(page); | |
1615 | unlock_page(page); | |
09cbfeaf | 1616 | put_page(page); |
31c542a1 YZ |
1617 | } |
1618 | } | |
1619 | ||
28127bdd YZ |
1620 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1621 | { | |
1622 | struct inode *inode = file_inode(filp); | |
1623 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1624 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1625 | struct ceph_osd_request *req; | |
1626 | struct page *page = NULL; | |
1627 | u64 len, inline_version; | |
1628 | int err = 0; | |
1629 | bool from_pagecache = false; | |
1630 | ||
1631 | spin_lock(&ci->i_ceph_lock); | |
1632 | inline_version = ci->i_inline_version; | |
1633 | spin_unlock(&ci->i_ceph_lock); | |
1634 | ||
1635 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1636 | inode, ceph_vinop(inode), inline_version); | |
1637 | ||
1638 | if (inline_version == 1 || /* initial version, no data */ | |
1639 | inline_version == CEPH_INLINE_NONE) | |
1640 | goto out; | |
1641 | ||
1642 | if (locked_page) { | |
1643 | page = locked_page; | |
1644 | WARN_ON(!PageUptodate(page)); | |
1645 | } else if (ceph_caps_issued(ci) & | |
1646 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1647 | page = find_get_page(inode->i_mapping, 0); | |
1648 | if (page) { | |
1649 | if (PageUptodate(page)) { | |
1650 | from_pagecache = true; | |
1651 | lock_page(page); | |
1652 | } else { | |
09cbfeaf | 1653 | put_page(page); |
28127bdd YZ |
1654 | page = NULL; |
1655 | } | |
1656 | } | |
1657 | } | |
1658 | ||
1659 | if (page) { | |
1660 | len = i_size_read(inode); | |
09cbfeaf KS |
1661 | if (len > PAGE_SIZE) |
1662 | len = PAGE_SIZE; | |
28127bdd YZ |
1663 | } else { |
1664 | page = __page_cache_alloc(GFP_NOFS); | |
1665 | if (!page) { | |
1666 | err = -ENOMEM; | |
1667 | goto out; | |
1668 | } | |
1669 | err = __ceph_do_getattr(inode, page, | |
1670 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1671 | if (err < 0) { | |
1672 | /* no inline data */ | |
1673 | if (err == -ENODATA) | |
1674 | err = 0; | |
1675 | goto out; | |
1676 | } | |
1677 | len = err; | |
1678 | } | |
1679 | ||
1680 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1681 | ceph_vino(inode), 0, &len, 0, 1, | |
54ea0046 | 1682 | CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, |
34b759b4 | 1683 | NULL, 0, 0, false); |
28127bdd YZ |
1684 | if (IS_ERR(req)) { |
1685 | err = PTR_ERR(req); | |
1686 | goto out; | |
1687 | } | |
1688 | ||
bb873b53 | 1689 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1690 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1691 | if (!err) | |
1692 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1693 | ceph_osdc_put_request(req); | |
1694 | if (err < 0) | |
1695 | goto out; | |
1696 | ||
1697 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1698 | ceph_vino(inode), 0, &len, 1, 3, | |
54ea0046 | 1699 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
34b759b4 ID |
1700 | NULL, ci->i_truncate_seq, |
1701 | ci->i_truncate_size, false); | |
28127bdd YZ |
1702 | if (IS_ERR(req)) { |
1703 | err = PTR_ERR(req); | |
1704 | goto out; | |
1705 | } | |
1706 | ||
1707 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1708 | ||
ec137c10 YZ |
1709 | { |
1710 | __le64 xattr_buf = cpu_to_le64(inline_version); | |
1711 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1712 | "inline_version", &xattr_buf, | |
1713 | sizeof(xattr_buf), | |
1714 | CEPH_OSD_CMPXATTR_OP_GT, | |
1715 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1716 | if (err) | |
1717 | goto out_put; | |
1718 | } | |
1719 | ||
1720 | { | |
1721 | char xattr_buf[32]; | |
1722 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), | |
1723 | "%llu", inline_version); | |
1724 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1725 | "inline_version", | |
1726 | xattr_buf, xattr_len, 0, 0); | |
1727 | if (err) | |
1728 | goto out_put; | |
1729 | } | |
28127bdd | 1730 | |
bb873b53 | 1731 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1732 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1733 | if (!err) | |
1734 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1735 | out_put: | |
1736 | ceph_osdc_put_request(req); | |
1737 | if (err == -ECANCELED) | |
1738 | err = 0; | |
1739 | out: | |
1740 | if (page && page != locked_page) { | |
1741 | if (from_pagecache) { | |
1742 | unlock_page(page); | |
09cbfeaf | 1743 | put_page(page); |
28127bdd YZ |
1744 | } else |
1745 | __free_pages(page, 0); | |
1746 | } | |
1747 | ||
1748 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1749 | inode, ceph_vinop(inode), inline_version, err); | |
1750 | return err; | |
1751 | } | |
1752 | ||
7cbea8dc | 1753 | static const struct vm_operations_struct ceph_vmops = { |
61f68816 | 1754 | .fault = ceph_filemap_fault, |
1d3576fd SW |
1755 | .page_mkwrite = ceph_page_mkwrite, |
1756 | }; | |
1757 | ||
1758 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1759 | { | |
1760 | struct address_space *mapping = file->f_mapping; | |
1761 | ||
1762 | if (!mapping->a_ops->readpage) | |
1763 | return -ENOEXEC; | |
1764 | file_accessed(file); | |
1765 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1766 | return 0; |
1767 | } | |
10183a69 YZ |
1768 | |
1769 | enum { | |
1770 | POOL_READ = 1, | |
1771 | POOL_WRITE = 2, | |
1772 | }; | |
1773 | ||
779fe0fb YZ |
1774 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
1775 | s64 pool, struct ceph_string *pool_ns) | |
10183a69 YZ |
1776 | { |
1777 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1778 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1779 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; | |
1780 | struct rb_node **p, *parent; | |
1781 | struct ceph_pool_perm *perm; | |
1782 | struct page **pages; | |
779fe0fb | 1783 | size_t pool_ns_len; |
10183a69 YZ |
1784 | int err = 0, err2 = 0, have = 0; |
1785 | ||
1786 | down_read(&mdsc->pool_perm_rwsem); | |
1787 | p = &mdsc->pool_perm_tree.rb_node; | |
1788 | while (*p) { | |
1789 | perm = rb_entry(*p, struct ceph_pool_perm, node); | |
1790 | if (pool < perm->pool) | |
1791 | p = &(*p)->rb_left; | |
1792 | else if (pool > perm->pool) | |
1793 | p = &(*p)->rb_right; | |
1794 | else { | |
779fe0fb YZ |
1795 | int ret = ceph_compare_string(pool_ns, |
1796 | perm->pool_ns, | |
1797 | perm->pool_ns_len); | |
1798 | if (ret < 0) | |
1799 | p = &(*p)->rb_left; | |
1800 | else if (ret > 0) | |
1801 | p = &(*p)->rb_right; | |
1802 | else { | |
1803 | have = perm->perm; | |
1804 | break; | |
1805 | } | |
10183a69 YZ |
1806 | } |
1807 | } | |
1808 | up_read(&mdsc->pool_perm_rwsem); | |
1809 | if (*p) | |
1810 | goto out; | |
1811 | ||
779fe0fb YZ |
1812 | if (pool_ns) |
1813 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", | |
1814 | pool, (int)pool_ns->len, pool_ns->str); | |
1815 | else | |
1816 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); | |
10183a69 YZ |
1817 | |
1818 | down_write(&mdsc->pool_perm_rwsem); | |
779fe0fb | 1819 | p = &mdsc->pool_perm_tree.rb_node; |
10183a69 YZ |
1820 | parent = NULL; |
1821 | while (*p) { | |
1822 | parent = *p; | |
1823 | perm = rb_entry(parent, struct ceph_pool_perm, node); | |
1824 | if (pool < perm->pool) | |
1825 | p = &(*p)->rb_left; | |
1826 | else if (pool > perm->pool) | |
1827 | p = &(*p)->rb_right; | |
1828 | else { | |
779fe0fb YZ |
1829 | int ret = ceph_compare_string(pool_ns, |
1830 | perm->pool_ns, | |
1831 | perm->pool_ns_len); | |
1832 | if (ret < 0) | |
1833 | p = &(*p)->rb_left; | |
1834 | else if (ret > 0) | |
1835 | p = &(*p)->rb_right; | |
1836 | else { | |
1837 | have = perm->perm; | |
1838 | break; | |
1839 | } | |
10183a69 YZ |
1840 | } |
1841 | } | |
1842 | if (*p) { | |
1843 | up_write(&mdsc->pool_perm_rwsem); | |
1844 | goto out; | |
1845 | } | |
1846 | ||
34b759b4 | 1847 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1848 | 1, false, GFP_NOFS); |
1849 | if (!rd_req) { | |
1850 | err = -ENOMEM; | |
1851 | goto out_unlock; | |
1852 | } | |
1853 | ||
1854 | rd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1855 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); | |
1856 | rd_req->r_base_oloc.pool = pool; | |
779fe0fb YZ |
1857 | if (pool_ns) |
1858 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); | |
d30291b9 | 1859 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
10183a69 | 1860 | |
13d1ad16 ID |
1861 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
1862 | if (err) | |
1863 | goto out_unlock; | |
10183a69 | 1864 | |
34b759b4 | 1865 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1866 | 1, false, GFP_NOFS); |
1867 | if (!wr_req) { | |
1868 | err = -ENOMEM; | |
1869 | goto out_unlock; | |
1870 | } | |
1871 | ||
54ea0046 | 1872 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE; |
10183a69 | 1873 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
63244fa1 | 1874 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
d30291b9 | 1875 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
10183a69 | 1876 | |
13d1ad16 ID |
1877 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
1878 | if (err) | |
1879 | goto out_unlock; | |
10183a69 YZ |
1880 | |
1881 | /* one page should be large enough for STAT data */ | |
1882 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); | |
1883 | if (IS_ERR(pages)) { | |
1884 | err = PTR_ERR(pages); | |
1885 | goto out_unlock; | |
1886 | } | |
1887 | ||
1888 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, | |
1889 | 0, false, true); | |
10183a69 YZ |
1890 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
1891 | ||
bb873b53 | 1892 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
a1f4020a | 1893 | wr_req->r_abort_on_full = true; |
10183a69 YZ |
1894 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
1895 | ||
1896 | if (!err) | |
1897 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); | |
1898 | if (!err2) | |
1899 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); | |
1900 | ||
1901 | if (err >= 0 || err == -ENOENT) | |
1902 | have |= POOL_READ; | |
1903 | else if (err != -EPERM) | |
1904 | goto out_unlock; | |
1905 | ||
1906 | if (err2 == 0 || err2 == -EEXIST) | |
1907 | have |= POOL_WRITE; | |
1908 | else if (err2 != -EPERM) { | |
1909 | err = err2; | |
1910 | goto out_unlock; | |
1911 | } | |
1912 | ||
779fe0fb YZ |
1913 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
1914 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); | |
10183a69 YZ |
1915 | if (!perm) { |
1916 | err = -ENOMEM; | |
1917 | goto out_unlock; | |
1918 | } | |
1919 | ||
1920 | perm->pool = pool; | |
1921 | perm->perm = have; | |
779fe0fb YZ |
1922 | perm->pool_ns_len = pool_ns_len; |
1923 | if (pool_ns_len > 0) | |
1924 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); | |
1925 | perm->pool_ns[pool_ns_len] = 0; | |
1926 | ||
10183a69 YZ |
1927 | rb_link_node(&perm->node, parent, p); |
1928 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); | |
1929 | err = 0; | |
1930 | out_unlock: | |
1931 | up_write(&mdsc->pool_perm_rwsem); | |
1932 | ||
3ed97d63 ID |
1933 | ceph_osdc_put_request(rd_req); |
1934 | ceph_osdc_put_request(wr_req); | |
10183a69 YZ |
1935 | out: |
1936 | if (!err) | |
1937 | err = have; | |
779fe0fb YZ |
1938 | if (pool_ns) |
1939 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", | |
1940 | pool, (int)pool_ns->len, pool_ns->str, err); | |
1941 | else | |
1942 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); | |
10183a69 YZ |
1943 | return err; |
1944 | } | |
1945 | ||
1946 | int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) | |
1947 | { | |
7627151e | 1948 | s64 pool; |
779fe0fb | 1949 | struct ceph_string *pool_ns; |
10183a69 YZ |
1950 | int ret, flags; |
1951 | ||
80e80fbb YZ |
1952 | if (ci->i_vino.snap != CEPH_NOSNAP) { |
1953 | /* | |
1954 | * Pool permission check needs to write to the first object. | |
1955 | * But for snapshot, head of the first object may have alread | |
1956 | * been deleted. Skip check to avoid creating orphan object. | |
1957 | */ | |
1958 | return 0; | |
1959 | } | |
1960 | ||
10183a69 YZ |
1961 | if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), |
1962 | NOPOOLPERM)) | |
1963 | return 0; | |
1964 | ||
1965 | spin_lock(&ci->i_ceph_lock); | |
1966 | flags = ci->i_ceph_flags; | |
7627151e | 1967 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
1968 | spin_unlock(&ci->i_ceph_lock); |
1969 | check: | |
1970 | if (flags & CEPH_I_POOL_PERM) { | |
1971 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { | |
7627151e | 1972 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
10183a69 YZ |
1973 | pool); |
1974 | return -EPERM; | |
1975 | } | |
1976 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { | |
7627151e | 1977 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
10183a69 YZ |
1978 | pool); |
1979 | return -EPERM; | |
1980 | } | |
1981 | return 0; | |
1982 | } | |
1983 | ||
779fe0fb YZ |
1984 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
1985 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); | |
1986 | ceph_put_string(pool_ns); | |
10183a69 YZ |
1987 | if (ret < 0) |
1988 | return ret; | |
1989 | ||
1990 | flags = CEPH_I_POOL_PERM; | |
1991 | if (ret & POOL_READ) | |
1992 | flags |= CEPH_I_POOL_RD; | |
1993 | if (ret & POOL_WRITE) | |
1994 | flags |= CEPH_I_POOL_WR; | |
1995 | ||
1996 | spin_lock(&ci->i_ceph_lock); | |
779fe0fb YZ |
1997 | if (pool == ci->i_layout.pool_id && |
1998 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { | |
1999 | ci->i_ceph_flags |= flags; | |
10183a69 | 2000 | } else { |
7627151e | 2001 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2002 | flags = ci->i_ceph_flags; |
2003 | } | |
2004 | spin_unlock(&ci->i_ceph_lock); | |
2005 | goto check; | |
2006 | } | |
2007 | ||
2008 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) | |
2009 | { | |
2010 | struct ceph_pool_perm *perm; | |
2011 | struct rb_node *n; | |
2012 | ||
2013 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { | |
2014 | n = rb_first(&mdsc->pool_perm_tree); | |
2015 | perm = rb_entry(n, struct ceph_pool_perm, node); | |
2016 | rb_erase(n, &mdsc->pool_perm_tree); | |
2017 | kfree(perm); | |
2018 | } | |
2019 | } |