Commit | Line | Data |
---|---|---|
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 | */ | |
dd2bc473 | 192 | static int ceph_do_readpage(struct file *filp, struct page *page) |
1d3576fd | 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 | 221 | if (err == 0) |
dd2bc473 | 222 | return -EINPROGRESS; |
99ccbd22 | 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 | { | |
dd2bc473 YZ |
252 | int r = ceph_do_readpage(filp, page); |
253 | if (r != -EINPROGRESS) | |
254 | unlock_page(page); | |
255 | else | |
256 | r = 0; | |
1d3576fd SW |
257 | return r; |
258 | } | |
259 | ||
260 | /* | |
7c272194 | 261 | * Finish an async read(ahead) op. |
1d3576fd | 262 | */ |
85e084fe | 263 | static void finish_read(struct ceph_osd_request *req) |
1d3576fd | 264 | { |
7c272194 | 265 | struct inode *inode = req->r_inode; |
87060c10 | 266 | struct ceph_osd_data *osd_data; |
85e084fe ID |
267 | int rc = req->r_result <= 0 ? req->r_result : 0; |
268 | int bytes = req->r_result >= 0 ? req->r_result : 0; | |
e0c59487 | 269 | int num_pages; |
7c272194 | 270 | int i; |
1d3576fd | 271 | |
7c272194 SW |
272 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
273 | ||
274 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 275 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
276 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
277 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
278 | (u64)osd_data->length); | |
e0c59487 | 279 | for (i = 0; i < num_pages; i++) { |
87060c10 | 280 | struct page *page = osd_data->pages[i]; |
7c272194 | 281 | |
368e3585 YZ |
282 | if (rc < 0 && rc != -ENOENT) { |
283 | ceph_fscache_readpage_cancel(inode, page); | |
f36132a7 | 284 | goto unlock; |
368e3585 | 285 | } |
09cbfeaf | 286 | if (bytes < (int)PAGE_SIZE) { |
7c272194 SW |
287 | /* zero (remainder of) page */ |
288 | int s = bytes < 0 ? 0 : bytes; | |
09cbfeaf | 289 | zero_user_segment(page, s, PAGE_SIZE); |
1d3576fd | 290 | } |
7c272194 SW |
291 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
292 | page->index); | |
293 | flush_dcache_page(page); | |
294 | SetPageUptodate(page); | |
99ccbd22 | 295 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 296 | unlock: |
7c272194 | 297 | unlock_page(page); |
09cbfeaf KS |
298 | put_page(page); |
299 | bytes -= PAGE_SIZE; | |
1d3576fd | 300 | } |
87060c10 | 301 | kfree(osd_data->pages); |
1d3576fd SW |
302 | } |
303 | ||
304 | /* | |
7c272194 SW |
305 | * start an async read(ahead) operation. return nr_pages we submitted |
306 | * a read for on success, or negative error code. | |
1d3576fd | 307 | */ |
0d66a487 | 308 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
1d3576fd | 309 | { |
3d14c5d2 YS |
310 | struct ceph_osd_client *osdc = |
311 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 SW |
312 | struct ceph_inode_info *ci = ceph_inode(inode); |
313 | struct page *page = list_entry(page_list->prev, struct page, lru); | |
acead002 | 314 | struct ceph_vino vino; |
7c272194 SW |
315 | struct ceph_osd_request *req; |
316 | u64 off; | |
1d3576fd | 317 | u64 len; |
7c272194 SW |
318 | int i; |
319 | struct page **pages; | |
320 | pgoff_t next_index; | |
321 | int nr_pages = 0; | |
2b1ac852 YZ |
322 | int got = 0; |
323 | int ret = 0; | |
324 | ||
325 | if (!current->journal_info) { | |
326 | /* caller of readpages does not hold buffer and read caps | |
327 | * (fadvise, madvise and readahead cases) */ | |
328 | int want = CEPH_CAP_FILE_CACHE; | |
329 | ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); | |
330 | if (ret < 0) { | |
331 | dout("start_read %p, error getting cap\n", inode); | |
332 | } else if (!(got & want)) { | |
333 | dout("start_read %p, no cache cap\n", inode); | |
334 | ret = 0; | |
335 | } | |
336 | if (ret <= 0) { | |
337 | if (got) | |
338 | ceph_put_cap_refs(ci, got); | |
339 | while (!list_empty(page_list)) { | |
340 | page = list_entry(page_list->prev, | |
341 | struct page, lru); | |
342 | list_del(&page->lru); | |
343 | put_page(page); | |
344 | } | |
345 | return ret; | |
346 | } | |
347 | } | |
1d3576fd | 348 | |
6285bc23 | 349 | off = (u64) page_offset(page); |
1d3576fd | 350 | |
7c272194 SW |
351 | /* count pages */ |
352 | next_index = page->index; | |
353 | list_for_each_entry_reverse(page, page_list, lru) { | |
354 | if (page->index != next_index) | |
355 | break; | |
356 | nr_pages++; | |
357 | next_index++; | |
0d66a487 SW |
358 | if (max && nr_pages == max) |
359 | break; | |
7c272194 | 360 | } |
09cbfeaf | 361 | len = nr_pages << PAGE_SHIFT; |
7c272194 SW |
362 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
363 | off, len); | |
acead002 AE |
364 | vino = ceph_vino(inode); |
365 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 366 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 367 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 368 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 369 | false); |
2b1ac852 YZ |
370 | if (IS_ERR(req)) { |
371 | ret = PTR_ERR(req); | |
372 | goto out; | |
373 | } | |
1d3576fd | 374 | |
7c272194 | 375 | /* build page vector */ |
cf7b7e14 | 376 | nr_pages = calc_pages_for(0, len); |
687265e5 | 377 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); |
2b1ac852 YZ |
378 | if (!pages) { |
379 | ret = -ENOMEM; | |
380 | goto out_put; | |
381 | } | |
7c272194 SW |
382 | for (i = 0; i < nr_pages; ++i) { |
383 | page = list_entry(page_list->prev, struct page, lru); | |
384 | BUG_ON(PageLocked(page)); | |
1d3576fd | 385 | list_del(&page->lru); |
99ccbd22 | 386 | |
7c272194 SW |
387 | dout("start_read %p adding %p idx %lu\n", inode, page, |
388 | page->index); | |
389 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
687265e5 | 390 | GFP_KERNEL)) { |
d4d3aa38 | 391 | ceph_fscache_uncache_page(inode, page); |
09cbfeaf | 392 | put_page(page); |
7c272194 | 393 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 394 | inode, page); |
7c272194 | 395 | nr_pages = i; |
1afe4785 YZ |
396 | if (nr_pages > 0) { |
397 | len = nr_pages << PAGE_SHIFT; | |
d641df81 | 398 | osd_req_op_extent_update(req, 0, len); |
1afe4785 YZ |
399 | break; |
400 | } | |
7c272194 | 401 | goto out_pages; |
1d3576fd | 402 | } |
7c272194 | 403 | pages[i] = page; |
1d3576fd | 404 | } |
406e2c9f | 405 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
406 | req->r_callback = finish_read; |
407 | req->r_inode = inode; | |
408 | ||
409 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); | |
410 | ret = ceph_osdc_start_request(osdc, req, false); | |
411 | if (ret < 0) | |
412 | goto out_pages; | |
413 | ceph_osdc_put_request(req); | |
2b1ac852 YZ |
414 | |
415 | /* After adding locked pages to page cache, the inode holds cache cap. | |
416 | * So we can drop our cap refs. */ | |
417 | if (got) | |
418 | ceph_put_cap_refs(ci, got); | |
419 | ||
7c272194 SW |
420 | return nr_pages; |
421 | ||
422 | out_pages: | |
1afe4785 YZ |
423 | for (i = 0; i < nr_pages; ++i) { |
424 | ceph_fscache_readpage_cancel(inode, pages[i]); | |
425 | unlock_page(pages[i]); | |
426 | } | |
427 | ceph_put_page_vector(pages, nr_pages, false); | |
2b1ac852 | 428 | out_put: |
7c272194 | 429 | ceph_osdc_put_request(req); |
2b1ac852 YZ |
430 | out: |
431 | if (got) | |
432 | ceph_put_cap_refs(ci, got); | |
7c272194 SW |
433 | return ret; |
434 | } | |
1d3576fd | 435 | |
7c272194 SW |
436 | |
437 | /* | |
438 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
439 | * the caller (VM) cleans them up. | |
440 | */ | |
441 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
442 | struct list_head *page_list, unsigned nr_pages) | |
443 | { | |
496ad9aa | 444 | struct inode *inode = file_inode(file); |
0d66a487 | 445 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
7c272194 | 446 | int rc = 0; |
0d66a487 SW |
447 | int max = 0; |
448 | ||
83701246 YZ |
449 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
450 | return -EINVAL; | |
451 | ||
99ccbd22 MT |
452 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
453 | &nr_pages); | |
454 | ||
455 | if (rc == 0) | |
456 | goto out; | |
457 | ||
09cbfeaf KS |
458 | if (fsc->mount_options->rsize >= PAGE_SIZE) |
459 | max = (fsc->mount_options->rsize + PAGE_SIZE - 1) | |
0d66a487 | 460 | >> PAGE_SHIFT; |
7c272194 | 461 | |
2794a82a AE |
462 | dout("readpages %p file %p nr_pages %d max %d\n", inode, |
463 | file, nr_pages, | |
0d66a487 | 464 | max); |
7c272194 | 465 | while (!list_empty(page_list)) { |
0d66a487 | 466 | rc = start_read(inode, page_list, max); |
7c272194 SW |
467 | if (rc < 0) |
468 | goto out; | |
7c272194 | 469 | } |
1d3576fd | 470 | out: |
76be778b MT |
471 | ceph_fscache_readpages_cancel(inode, page_list); |
472 | ||
7c272194 | 473 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
474 | return rc; |
475 | } | |
476 | ||
477 | /* | |
478 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
479 | * only snap context we are allowed to write back. | |
1d3576fd | 480 | */ |
6298a337 | 481 | static struct ceph_snap_context *get_oldest_context(struct inode *inode, |
5f743e45 YZ |
482 | loff_t *snap_size, |
483 | u64 *truncate_size, | |
484 | u32 *truncate_seq) | |
1d3576fd SW |
485 | { |
486 | struct ceph_inode_info *ci = ceph_inode(inode); | |
487 | struct ceph_snap_context *snapc = NULL; | |
488 | struct ceph_cap_snap *capsnap = NULL; | |
489 | ||
be655596 | 490 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
491 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
492 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
493 | capsnap->context, capsnap->dirty_pages); | |
494 | if (capsnap->dirty_pages) { | |
495 | snapc = ceph_get_snap_context(capsnap->context); | |
496 | if (snap_size) | |
497 | *snap_size = capsnap->size; | |
5f743e45 YZ |
498 | if (truncate_size) |
499 | *truncate_size = capsnap->truncate_size; | |
500 | if (truncate_seq) | |
501 | *truncate_seq = capsnap->truncate_seq; | |
1d3576fd SW |
502 | break; |
503 | } | |
504 | } | |
7d8cb26d | 505 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 506 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
507 | dout(" head snapc %p has %d dirty pages\n", |
508 | snapc, ci->i_wrbuffer_ref_head); | |
5f743e45 | 509 | if (truncate_size) |
84fcc2d2 | 510 | *truncate_size = ci->i_truncate_size; |
5f743e45 | 511 | if (truncate_seq) |
84fcc2d2 | 512 | *truncate_seq = ci->i_truncate_seq; |
1d3576fd | 513 | } |
be655596 | 514 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
515 | return snapc; |
516 | } | |
517 | ||
518 | /* | |
519 | * Write a single page, but leave the page locked. | |
520 | * | |
521 | * If we get a write error, set the page error bit, but still adjust the | |
522 | * dirty page accounting (i.e., page is no longer dirty). | |
523 | */ | |
524 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
525 | { | |
526 | struct inode *inode; | |
527 | struct ceph_inode_info *ci; | |
3d14c5d2 | 528 | struct ceph_fs_client *fsc; |
1d3576fd | 529 | struct ceph_osd_client *osdc; |
6298a337 | 530 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 531 | loff_t page_off = page_offset(page); |
e1966b49 | 532 | loff_t snap_size = -1; |
2baba250 | 533 | long writeback_stat; |
e1966b49 | 534 | u64 truncate_size; |
fc2744aa | 535 | u32 truncate_seq; |
43986881 | 536 | int err, len = PAGE_SIZE; |
1d3576fd SW |
537 | |
538 | dout("writepage %p idx %lu\n", page, page->index); | |
539 | ||
1d3576fd SW |
540 | inode = page->mapping->host; |
541 | ci = ceph_inode(inode); | |
3d14c5d2 YS |
542 | fsc = ceph_inode_to_client(inode); |
543 | osdc = &fsc->client->osdc; | |
1d3576fd SW |
544 | |
545 | /* verify this is a writeable snap context */ | |
61600ef8 | 546 | snapc = page_snap_context(page); |
1d3576fd SW |
547 | if (snapc == NULL) { |
548 | dout("writepage %p page %p not dirty?\n", inode, page); | |
43986881 | 549 | return 0; |
1d3576fd | 550 | } |
5f743e45 YZ |
551 | oldest = get_oldest_context(inode, &snap_size, |
552 | &truncate_size, &truncate_seq); | |
6298a337 | 553 | if (snapc->seq > oldest->seq) { |
1d3576fd | 554 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 555 | inode, page, snapc); |
1d3576fd | 556 | /* we should only noop if called by kswapd */ |
fa71fefb | 557 | WARN_ON(!(current->flags & PF_MEMALLOC)); |
6298a337 | 558 | ceph_put_snap_context(oldest); |
fa71fefb | 559 | redirty_page_for_writepage(wbc, page); |
43986881 | 560 | return 0; |
1d3576fd | 561 | } |
6298a337 | 562 | ceph_put_snap_context(oldest); |
1d3576fd | 563 | |
e1966b49 | 564 | if (snap_size == -1) |
fc2744aa | 565 | snap_size = i_size_read(inode); |
fc2744aa | 566 | |
1d3576fd | 567 | /* is this a partial page at end of file? */ |
fc2744aa YZ |
568 | if (page_off >= snap_size) { |
569 | dout("%p page eof %llu\n", page, snap_size); | |
43986881 | 570 | return 0; |
fc2744aa | 571 | } |
43986881 | 572 | |
fc2744aa YZ |
573 | if (snap_size < page_off + len) |
574 | len = snap_size - page_off; | |
1d3576fd | 575 | |
ae00d4f3 SW |
576 | dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", |
577 | inode, page, page->index, page_off, len, snapc); | |
1d3576fd | 578 | |
3d14c5d2 | 579 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
2baba250 | 580 | if (writeback_stat > |
3d14c5d2 | 581 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
09dc9fc2 | 582 | set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
2baba250 | 583 | |
1d3576fd SW |
584 | set_page_writeback(page); |
585 | err = ceph_osdc_writepages(osdc, ceph_vino(inode), | |
586 | &ci->i_layout, snapc, | |
587 | page_off, len, | |
fc2744aa | 588 | truncate_seq, truncate_size, |
24808826 | 589 | &inode->i_mtime, &page, 1); |
1d3576fd | 590 | if (err < 0) { |
ad15ec06 YZ |
591 | struct writeback_control tmp_wbc; |
592 | if (!wbc) | |
593 | wbc = &tmp_wbc; | |
594 | if (err == -ERESTARTSYS) { | |
595 | /* killed by SIGKILL */ | |
596 | dout("writepage interrupted page %p\n", page); | |
597 | redirty_page_for_writepage(wbc, page); | |
598 | end_page_writeback(page); | |
43986881 | 599 | return err; |
ad15ec06 YZ |
600 | } |
601 | dout("writepage setting page/mapping error %d %p\n", | |
602 | err, page); | |
1d3576fd SW |
603 | SetPageError(page); |
604 | mapping_set_error(&inode->i_data, err); | |
ad15ec06 | 605 | wbc->pages_skipped++; |
1d3576fd SW |
606 | } else { |
607 | dout("writepage cleaned page %p\n", page); | |
608 | err = 0; /* vfs expects us to return 0 */ | |
609 | } | |
610 | page->private = 0; | |
611 | ClearPagePrivate(page); | |
612 | end_page_writeback(page); | |
613 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 614 | ceph_put_snap_context(snapc); /* page's reference */ |
1d3576fd SW |
615 | return err; |
616 | } | |
617 | ||
618 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
619 | { | |
dbd646a8 YS |
620 | int err; |
621 | struct inode *inode = page->mapping->host; | |
622 | BUG_ON(!inode); | |
70b666c3 | 623 | ihold(inode); |
dbd646a8 | 624 | err = writepage_nounlock(page, wbc); |
ad15ec06 YZ |
625 | if (err == -ERESTARTSYS) { |
626 | /* direct memory reclaimer was killed by SIGKILL. return 0 | |
627 | * to prevent caller from setting mapping/page error */ | |
628 | err = 0; | |
629 | } | |
1d3576fd | 630 | unlock_page(page); |
dbd646a8 | 631 | iput(inode); |
1d3576fd SW |
632 | return err; |
633 | } | |
634 | ||
1d3576fd SW |
635 | /* |
636 | * lame release_pages helper. release_pages() isn't exported to | |
637 | * modules. | |
638 | */ | |
639 | static void ceph_release_pages(struct page **pages, int num) | |
640 | { | |
641 | struct pagevec pvec; | |
642 | int i; | |
643 | ||
644 | pagevec_init(&pvec, 0); | |
645 | for (i = 0; i < num; i++) { | |
646 | if (pagevec_add(&pvec, pages[i]) == 0) | |
647 | pagevec_release(&pvec); | |
648 | } | |
649 | pagevec_release(&pvec); | |
650 | } | |
651 | ||
1d3576fd SW |
652 | /* |
653 | * async writeback completion handler. | |
654 | * | |
655 | * If we get an error, set the mapping error bit, but not the individual | |
656 | * page error bits. | |
657 | */ | |
85e084fe | 658 | static void writepages_finish(struct ceph_osd_request *req) |
1d3576fd SW |
659 | { |
660 | struct inode *inode = req->r_inode; | |
1d3576fd | 661 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 662 | struct ceph_osd_data *osd_data; |
1d3576fd | 663 | struct page *page; |
5b64640c YZ |
664 | int num_pages, total_pages = 0; |
665 | int i, j; | |
666 | int rc = req->r_result; | |
1d3576fd SW |
667 | struct ceph_snap_context *snapc = req->r_snapc; |
668 | struct address_space *mapping = inode->i_mapping; | |
3d14c5d2 | 669 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
5b64640c | 670 | bool remove_page; |
1d3576fd | 671 | |
5b64640c | 672 | dout("writepages_finish %p rc %d\n", inode, rc); |
26544c62 | 673 | if (rc < 0) { |
1d3576fd | 674 | mapping_set_error(mapping, rc); |
26544c62 JL |
675 | ceph_set_error_write(ci); |
676 | } else { | |
677 | ceph_clear_error_write(ci); | |
678 | } | |
5b64640c YZ |
679 | |
680 | /* | |
681 | * We lost the cache cap, need to truncate the page before | |
682 | * it is unlocked, otherwise we'd truncate it later in the | |
683 | * page truncation thread, possibly losing some data that | |
684 | * raced its way in | |
685 | */ | |
686 | remove_page = !(ceph_caps_issued(ci) & | |
687 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); | |
1d3576fd SW |
688 | |
689 | /* clean all pages */ | |
5b64640c YZ |
690 | for (i = 0; i < req->r_num_ops; i++) { |
691 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) | |
692 | break; | |
e63dc5c7 | 693 | |
5b64640c YZ |
694 | osd_data = osd_req_op_extent_osd_data(req, i); |
695 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); | |
696 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
697 | (u64)osd_data->length); | |
698 | total_pages += num_pages; | |
699 | for (j = 0; j < num_pages; j++) { | |
700 | page = osd_data->pages[j]; | |
701 | BUG_ON(!page); | |
702 | WARN_ON(!PageUptodate(page)); | |
703 | ||
704 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
705 | CONGESTION_OFF_THRESH( | |
706 | fsc->mount_options->congestion_kb)) | |
09dc9fc2 | 707 | clear_bdi_congested(inode_to_bdi(inode), |
5b64640c YZ |
708 | BLK_RW_ASYNC); |
709 | ||
710 | ceph_put_snap_context(page_snap_context(page)); | |
711 | page->private = 0; | |
712 | ClearPagePrivate(page); | |
713 | dout("unlocking %p\n", page); | |
714 | end_page_writeback(page); | |
715 | ||
716 | if (remove_page) | |
717 | generic_error_remove_page(inode->i_mapping, | |
718 | page); | |
719 | ||
720 | unlock_page(page); | |
721 | } | |
722 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", | |
723 | inode, osd_data->length, rc >= 0 ? num_pages : 0); | |
e63dc5c7 | 724 | |
5b64640c | 725 | ceph_release_pages(osd_data->pages, num_pages); |
1d3576fd | 726 | } |
1d3576fd | 727 | |
5b64640c YZ |
728 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
729 | ||
730 | osd_data = osd_req_op_extent_osd_data(req, 0); | |
87060c10 AE |
731 | if (osd_data->pages_from_pool) |
732 | mempool_free(osd_data->pages, | |
640ef79d | 733 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
1d3576fd | 734 | else |
87060c10 | 735 | kfree(osd_data->pages); |
1d3576fd SW |
736 | ceph_osdc_put_request(req); |
737 | } | |
738 | ||
1d3576fd SW |
739 | /* |
740 | * initiate async writeback | |
741 | */ | |
742 | static int ceph_writepages_start(struct address_space *mapping, | |
743 | struct writeback_control *wbc) | |
744 | { | |
745 | struct inode *inode = mapping->host; | |
1d3576fd | 746 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
747 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
748 | struct ceph_vino vino = ceph_vino(inode); | |
1d3576fd SW |
749 | pgoff_t index, start, end; |
750 | int range_whole = 0; | |
751 | int should_loop = 1; | |
752 | pgoff_t max_pages = 0, max_pages_ever = 0; | |
80e755fe | 753 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd SW |
754 | struct pagevec pvec; |
755 | int done = 0; | |
756 | int rc = 0; | |
93407472 | 757 | unsigned int wsize = i_blocksize(inode); |
1d3576fd | 758 | struct ceph_osd_request *req = NULL; |
021b77be | 759 | int do_sync = 0; |
e1966b49 YZ |
760 | loff_t snap_size, i_size; |
761 | u64 truncate_size; | |
fc2744aa | 762 | u32 truncate_seq; |
1d3576fd SW |
763 | |
764 | /* | |
765 | * Include a 'sync' in the OSD request if this is a data | |
766 | * integrity write (e.g., O_SYNC write or fsync()), or if our | |
767 | * cap is being revoked. | |
768 | */ | |
c62988ec | 769 | if ((wbc->sync_mode == WB_SYNC_ALL) || |
770 | ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) | |
1d3576fd SW |
771 | do_sync = 1; |
772 | dout("writepages_start %p dosync=%d (mode=%s)\n", | |
773 | inode, do_sync, | |
774 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : | |
775 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
776 | ||
52953d55 | 777 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
778 | if (ci->i_wrbuffer_ref > 0) { |
779 | pr_warn_ratelimited( | |
780 | "writepage_start %p %lld forced umount\n", | |
781 | inode, ceph_ino(inode)); | |
782 | } | |
a341d4df | 783 | mapping_set_error(mapping, -EIO); |
1d3576fd SW |
784 | return -EIO; /* we're in a forced umount, don't write! */ |
785 | } | |
3d14c5d2 YS |
786 | if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) |
787 | wsize = fsc->mount_options->wsize; | |
09cbfeaf KS |
788 | if (wsize < PAGE_SIZE) |
789 | wsize = PAGE_SIZE; | |
790 | max_pages_ever = wsize >> PAGE_SHIFT; | |
1d3576fd SW |
791 | |
792 | pagevec_init(&pvec, 0); | |
793 | ||
1d3576fd SW |
794 | /* where to start/end? */ |
795 | if (wbc->range_cyclic) { | |
796 | start = mapping->writeback_index; /* Start from prev offset */ | |
797 | end = -1; | |
798 | dout(" cyclic, start at %lu\n", start); | |
799 | } else { | |
09cbfeaf KS |
800 | start = wbc->range_start >> PAGE_SHIFT; |
801 | end = wbc->range_end >> PAGE_SHIFT; | |
1d3576fd SW |
802 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
803 | range_whole = 1; | |
804 | should_loop = 0; | |
805 | dout(" not cyclic, %lu to %lu\n", start, end); | |
806 | } | |
807 | index = start; | |
808 | ||
809 | retry: | |
810 | /* find oldest snap context with dirty data */ | |
811 | ceph_put_snap_context(snapc); | |
e1966b49 | 812 | snap_size = -1; |
5f743e45 YZ |
813 | snapc = get_oldest_context(inode, &snap_size, |
814 | &truncate_size, &truncate_seq); | |
1d3576fd SW |
815 | if (!snapc) { |
816 | /* hmm, why does writepages get called when there | |
817 | is no dirty data? */ | |
818 | dout(" no snap context with dirty data?\n"); | |
819 | goto out; | |
820 | } | |
821 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", | |
822 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa | 823 | |
e1966b49 | 824 | i_size = i_size_read(inode); |
fc2744aa | 825 | |
1d3576fd SW |
826 | if (last_snapc && snapc != last_snapc) { |
827 | /* if we switched to a newer snapc, restart our scan at the | |
828 | * start of the original file range. */ | |
829 | dout(" snapc differs from last pass, restarting at %lu\n", | |
830 | index); | |
831 | index = start; | |
832 | } | |
833 | last_snapc = snapc; | |
834 | ||
835 | while (!done && index <= end) { | |
836 | unsigned i; | |
837 | int first; | |
5b64640c YZ |
838 | pgoff_t strip_unit_end = 0; |
839 | int num_ops = 0, op_idx; | |
840 | int pvec_pages, locked_pages = 0; | |
841 | struct page **pages = NULL, **data_pages; | |
e5975c7c | 842 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
1d3576fd SW |
843 | struct page *page; |
844 | int want; | |
5b64640c | 845 | u64 offset = 0, len = 0; |
1d3576fd | 846 | |
1d3576fd SW |
847 | max_pages = max_pages_ever; |
848 | ||
849 | get_more_pages: | |
850 | first = -1; | |
851 | want = min(end - index, | |
852 | min((pgoff_t)PAGEVEC_SIZE, | |
853 | max_pages - (pgoff_t)locked_pages) - 1) | |
854 | + 1; | |
855 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
856 | PAGECACHE_TAG_DIRTY, | |
857 | want); | |
858 | dout("pagevec_lookup_tag got %d\n", pvec_pages); | |
859 | if (!pvec_pages && !locked_pages) | |
860 | break; | |
861 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
862 | page = pvec.pages[i]; | |
863 | dout("? %p idx %lu\n", page, page->index); | |
864 | if (locked_pages == 0) | |
865 | lock_page(page); /* first page */ | |
866 | else if (!trylock_page(page)) | |
867 | break; | |
868 | ||
869 | /* only dirty pages, or our accounting breaks */ | |
870 | if (unlikely(!PageDirty(page)) || | |
871 | unlikely(page->mapping != mapping)) { | |
872 | dout("!dirty or !mapping %p\n", page); | |
873 | unlock_page(page); | |
874 | break; | |
875 | } | |
876 | if (!wbc->range_cyclic && page->index > end) { | |
877 | dout("end of range %p\n", page); | |
878 | done = 1; | |
879 | unlock_page(page); | |
880 | break; | |
881 | } | |
5b64640c YZ |
882 | if (strip_unit_end && (page->index > strip_unit_end)) { |
883 | dout("end of strip unit %p\n", page); | |
1d3576fd SW |
884 | unlock_page(page); |
885 | break; | |
886 | } | |
887 | if (wbc->sync_mode != WB_SYNC_NONE) { | |
888 | dout("waiting on writeback %p\n", page); | |
889 | wait_on_page_writeback(page); | |
890 | } | |
e1966b49 YZ |
891 | if (page_offset(page) >= |
892 | (snap_size == -1 ? i_size : snap_size)) { | |
893 | dout("%p page eof %llu\n", page, | |
894 | (snap_size == -1 ? i_size : snap_size)); | |
1d3576fd SW |
895 | done = 1; |
896 | unlock_page(page); | |
897 | break; | |
898 | } | |
899 | if (PageWriteback(page)) { | |
900 | dout("%p under writeback\n", page); | |
901 | unlock_page(page); | |
902 | break; | |
903 | } | |
904 | ||
905 | /* only if matching snap context */ | |
61600ef8 | 906 | pgsnapc = page_snap_context(page); |
80e755fe SW |
907 | if (pgsnapc->seq > snapc->seq) { |
908 | dout("page snapc %p %lld > oldest %p %lld\n", | |
909 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); | |
1d3576fd SW |
910 | unlock_page(page); |
911 | if (!locked_pages) | |
912 | continue; /* keep looking for snap */ | |
913 | break; | |
914 | } | |
915 | ||
916 | if (!clear_page_dirty_for_io(page)) { | |
917 | dout("%p !clear_page_dirty_for_io\n", page); | |
918 | unlock_page(page); | |
919 | break; | |
920 | } | |
921 | ||
e5975c7c AE |
922 | /* |
923 | * We have something to write. If this is | |
924 | * the first locked page this time through, | |
5b64640c YZ |
925 | * calculate max possinle write size and |
926 | * allocate a page array | |
e5975c7c | 927 | */ |
1d3576fd | 928 | if (locked_pages == 0) { |
5b64640c YZ |
929 | u64 objnum; |
930 | u64 objoff; | |
931 | ||
1d3576fd | 932 | /* prepare async write request */ |
e5975c7c | 933 | offset = (u64)page_offset(page); |
1d3576fd | 934 | len = wsize; |
5b64640c YZ |
935 | |
936 | rc = ceph_calc_file_object_mapping(&ci->i_layout, | |
937 | offset, len, | |
938 | &objnum, &objoff, | |
939 | &len); | |
940 | if (rc < 0) { | |
8c71897b HC |
941 | unlock_page(page); |
942 | break; | |
943 | } | |
944 | ||
5b64640c YZ |
945 | num_ops = 1 + do_sync; |
946 | strip_unit_end = page->index + | |
09cbfeaf | 947 | ((len - 1) >> PAGE_SHIFT); |
88486957 | 948 | |
5b64640c | 949 | BUG_ON(pages); |
88486957 | 950 | max_pages = calc_pages_for(0, (u64)len); |
fc2744aa YZ |
951 | pages = kmalloc(max_pages * sizeof (*pages), |
952 | GFP_NOFS); | |
88486957 AE |
953 | if (!pages) { |
954 | pool = fsc->wb_pagevec_pool; | |
88486957 | 955 | pages = mempool_alloc(pool, GFP_NOFS); |
e5975c7c | 956 | BUG_ON(!pages); |
88486957 | 957 | } |
5b64640c YZ |
958 | |
959 | len = 0; | |
960 | } else if (page->index != | |
09cbfeaf | 961 | (offset + len) >> PAGE_SHIFT) { |
5b64640c YZ |
962 | if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : |
963 | CEPH_OSD_MAX_OPS)) { | |
964 | redirty_page_for_writepage(wbc, page); | |
965 | unlock_page(page); | |
966 | break; | |
967 | } | |
968 | ||
969 | num_ops++; | |
970 | offset = (u64)page_offset(page); | |
971 | len = 0; | |
1d3576fd SW |
972 | } |
973 | ||
974 | /* note position of first page in pvec */ | |
975 | if (first < 0) | |
976 | first = i; | |
977 | dout("%p will write page %p idx %lu\n", | |
978 | inode, page, page->index); | |
2baba250 | 979 | |
5b64640c YZ |
980 | if (atomic_long_inc_return(&fsc->writeback_count) > |
981 | CONGESTION_ON_THRESH( | |
3d14c5d2 | 982 | fsc->mount_options->congestion_kb)) { |
09dc9fc2 | 983 | set_bdi_congested(inode_to_bdi(inode), |
213c99ee | 984 | BLK_RW_ASYNC); |
2baba250 YS |
985 | } |
986 | ||
e5975c7c | 987 | pages[locked_pages] = page; |
1d3576fd | 988 | locked_pages++; |
09cbfeaf | 989 | len += PAGE_SIZE; |
1d3576fd SW |
990 | } |
991 | ||
992 | /* did we get anything? */ | |
993 | if (!locked_pages) | |
994 | goto release_pvec_pages; | |
995 | if (i) { | |
996 | int j; | |
997 | BUG_ON(!locked_pages || first < 0); | |
998 | ||
999 | if (pvec_pages && i == pvec_pages && | |
1000 | locked_pages < max_pages) { | |
1001 | dout("reached end pvec, trying for more\n"); | |
1002 | pagevec_reinit(&pvec); | |
1003 | goto get_more_pages; | |
1004 | } | |
1005 | ||
1006 | /* shift unused pages over in the pvec... we | |
1007 | * will need to release them below. */ | |
1008 | for (j = i; j < pvec_pages; j++) { | |
5b64640c | 1009 | dout(" pvec leftover page %p\n", pvec.pages[j]); |
1d3576fd SW |
1010 | pvec.pages[j-i+first] = pvec.pages[j]; |
1011 | } | |
1012 | pvec.nr -= i-first; | |
1013 | } | |
1014 | ||
5b64640c | 1015 | new_request: |
e5975c7c | 1016 | offset = page_offset(pages[0]); |
5b64640c YZ |
1017 | len = wsize; |
1018 | ||
1019 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1020 | &ci->i_layout, vino, | |
1021 | offset, &len, 0, num_ops, | |
1022 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1023 | CEPH_OSD_FLAG_WRITE, |
5b64640c YZ |
1024 | snapc, truncate_seq, |
1025 | truncate_size, false); | |
1026 | if (IS_ERR(req)) { | |
1027 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1028 | &ci->i_layout, vino, | |
1029 | offset, &len, 0, | |
1030 | min(num_ops, | |
1031 | CEPH_OSD_SLAB_OPS), | |
1032 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1033 | CEPH_OSD_FLAG_WRITE, |
5b64640c YZ |
1034 | snapc, truncate_seq, |
1035 | truncate_size, true); | |
1036 | BUG_ON(IS_ERR(req)); | |
e1966b49 | 1037 | } |
5b64640c | 1038 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
09cbfeaf | 1039 | PAGE_SIZE - offset); |
5b64640c YZ |
1040 | |
1041 | req->r_callback = writepages_finish; | |
1042 | req->r_inode = inode; | |
1d3576fd | 1043 | |
5b64640c YZ |
1044 | /* Format the osd request message and submit the write */ |
1045 | len = 0; | |
1046 | data_pages = pages; | |
1047 | op_idx = 0; | |
1048 | for (i = 0; i < locked_pages; i++) { | |
1049 | u64 cur_offset = page_offset(pages[i]); | |
1050 | if (offset + len != cur_offset) { | |
1051 | if (op_idx + do_sync + 1 == req->r_num_ops) | |
1052 | break; | |
1053 | osd_req_op_extent_dup_last(req, op_idx, | |
1054 | cur_offset - offset); | |
1055 | dout("writepages got pages at %llu~%llu\n", | |
1056 | offset, len); | |
1057 | osd_req_op_extent_osd_data_pages(req, op_idx, | |
1058 | data_pages, len, 0, | |
a4ce40a9 | 1059 | !!pool, false); |
5b64640c | 1060 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1061 | |
5b64640c YZ |
1062 | len = 0; |
1063 | offset = cur_offset; | |
1064 | data_pages = pages + i; | |
1065 | op_idx++; | |
1066 | } | |
1067 | ||
1068 | set_page_writeback(pages[i]); | |
09cbfeaf | 1069 | len += PAGE_SIZE; |
5b64640c YZ |
1070 | } |
1071 | ||
1072 | if (snap_size != -1) { | |
1073 | len = min(len, snap_size - offset); | |
1074 | } else if (i == locked_pages) { | |
1075 | /* writepages_finish() clears writeback pages | |
1076 | * according to the data length, so make sure | |
1077 | * data length covers all locked pages */ | |
09cbfeaf | 1078 | u64 min_len = len + 1 - PAGE_SIZE; |
5b64640c YZ |
1079 | len = min(len, (u64)i_size_read(inode) - offset); |
1080 | len = max(len, min_len); | |
1081 | } | |
1082 | dout("writepages got pages at %llu~%llu\n", offset, len); | |
e5975c7c | 1083 | |
5b64640c YZ |
1084 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
1085 | 0, !!pool, false); | |
1086 | osd_req_op_extent_update(req, op_idx, len); | |
e5975c7c | 1087 | |
5b64640c YZ |
1088 | if (do_sync) { |
1089 | op_idx++; | |
1090 | osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); | |
1091 | } | |
1092 | BUG_ON(op_idx + 1 != req->r_num_ops); | |
1093 | ||
1094 | pool = NULL; | |
1095 | if (i < locked_pages) { | |
1096 | BUG_ON(num_ops <= req->r_num_ops); | |
1097 | num_ops -= req->r_num_ops; | |
1098 | num_ops += do_sync; | |
1099 | locked_pages -= i; | |
1100 | ||
1101 | /* allocate new pages array for next request */ | |
1102 | data_pages = pages; | |
1103 | pages = kmalloc(locked_pages * sizeof (*pages), | |
1104 | GFP_NOFS); | |
1105 | if (!pages) { | |
1106 | pool = fsc->wb_pagevec_pool; | |
1107 | pages = mempool_alloc(pool, GFP_NOFS); | |
1108 | BUG_ON(!pages); | |
1109 | } | |
1110 | memcpy(pages, data_pages + i, | |
1111 | locked_pages * sizeof(*pages)); | |
1112 | memset(data_pages + i, 0, | |
1113 | locked_pages * sizeof(*pages)); | |
1114 | } else { | |
1115 | BUG_ON(num_ops != req->r_num_ops); | |
1116 | index = pages[i - 1]->index + 1; | |
1117 | /* request message now owns the pages array */ | |
1118 | pages = NULL; | |
1119 | } | |
e5975c7c | 1120 | |
bb873b53 | 1121 | req->r_mtime = inode->i_mtime; |
9d6fcb08 SW |
1122 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
1123 | BUG_ON(rc); | |
1d3576fd SW |
1124 | req = NULL; |
1125 | ||
5b64640c YZ |
1126 | wbc->nr_to_write -= i; |
1127 | if (pages) | |
1128 | goto new_request; | |
1129 | ||
1d3576fd SW |
1130 | if (wbc->nr_to_write <= 0) |
1131 | done = 1; | |
1132 | ||
1133 | release_pvec_pages: | |
1134 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
1135 | pvec.nr ? pvec.pages[0] : NULL); | |
1136 | pagevec_release(&pvec); | |
1137 | ||
1138 | if (locked_pages && !done) | |
1139 | goto retry; | |
1140 | } | |
1141 | ||
1142 | if (should_loop && !done) { | |
1143 | /* more to do; loop back to beginning of file */ | |
1144 | dout("writepages looping back to beginning of file\n"); | |
1145 | should_loop = 0; | |
1146 | index = 0; | |
1147 | goto retry; | |
1148 | } | |
1149 | ||
1150 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1151 | mapping->writeback_index = index; | |
1152 | ||
1153 | out: | |
3ed97d63 | 1154 | ceph_osdc_put_request(req); |
1d3576fd SW |
1155 | ceph_put_snap_context(snapc); |
1156 | dout("writepages done, rc = %d\n", rc); | |
1d3576fd SW |
1157 | return rc; |
1158 | } | |
1159 | ||
1160 | ||
1161 | ||
1162 | /* | |
1163 | * See if a given @snapc is either writeable, or already written. | |
1164 | */ | |
1165 | static int context_is_writeable_or_written(struct inode *inode, | |
1166 | struct ceph_snap_context *snapc) | |
1167 | { | |
5f743e45 YZ |
1168 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, |
1169 | NULL, NULL); | |
6298a337 SW |
1170 | int ret = !oldest || snapc->seq <= oldest->seq; |
1171 | ||
1172 | ceph_put_snap_context(oldest); | |
1173 | return ret; | |
1d3576fd SW |
1174 | } |
1175 | ||
1176 | /* | |
1177 | * We are only allowed to write into/dirty the page if the page is | |
1178 | * clean, or already dirty within the same snap context. | |
8f883c24 SW |
1179 | * |
1180 | * called with page locked. | |
1181 | * return success with page locked, | |
1182 | * or any failure (incl -EAGAIN) with page unlocked. | |
1d3576fd | 1183 | */ |
4af6b225 YS |
1184 | static int ceph_update_writeable_page(struct file *file, |
1185 | loff_t pos, unsigned len, | |
1186 | struct page *page) | |
1d3576fd | 1187 | { |
496ad9aa | 1188 | struct inode *inode = file_inode(file); |
6c93df5d | 1189 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 1190 | struct ceph_inode_info *ci = ceph_inode(inode); |
09cbfeaf KS |
1191 | loff_t page_off = pos & PAGE_MASK; |
1192 | int pos_in_page = pos & ~PAGE_MASK; | |
1d3576fd SW |
1193 | int end_in_page = pos_in_page + len; |
1194 | loff_t i_size; | |
1d3576fd | 1195 | int r; |
80e755fe | 1196 | struct ceph_snap_context *snapc, *oldest; |
1d3576fd | 1197 | |
52953d55 | 1198 | if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
1199 | dout(" page %p forced umount\n", page); |
1200 | unlock_page(page); | |
1201 | return -EIO; | |
1202 | } | |
1203 | ||
1d3576fd SW |
1204 | retry_locked: |
1205 | /* writepages currently holds page lock, but if we change that later, */ | |
1206 | wait_on_page_writeback(page); | |
1207 | ||
61600ef8 | 1208 | snapc = page_snap_context(page); |
80e755fe | 1209 | if (snapc && snapc != ci->i_head_snapc) { |
1d3576fd SW |
1210 | /* |
1211 | * this page is already dirty in another (older) snap | |
1212 | * context! is it writeable now? | |
1213 | */ | |
5f743e45 | 1214 | oldest = get_oldest_context(inode, NULL, NULL, NULL); |
1d3576fd | 1215 | |
80e755fe | 1216 | if (snapc->seq > oldest->seq) { |
6298a337 | 1217 | ceph_put_snap_context(oldest); |
1d3576fd | 1218 | dout(" page %p snapc %p not current or oldest\n", |
6298a337 | 1219 | page, snapc); |
1d3576fd SW |
1220 | /* |
1221 | * queue for writeback, and wait for snapc to | |
1222 | * be writeable or written | |
1223 | */ | |
6298a337 | 1224 | snapc = ceph_get_snap_context(snapc); |
1d3576fd | 1225 | unlock_page(page); |
3c6f6b79 | 1226 | ceph_queue_writeback(inode); |
a78bbd4b | 1227 | r = wait_event_killable(ci->i_cap_wq, |
1d3576fd SW |
1228 | context_is_writeable_or_written(inode, snapc)); |
1229 | ceph_put_snap_context(snapc); | |
8f883c24 SW |
1230 | if (r == -ERESTARTSYS) |
1231 | return r; | |
4af6b225 | 1232 | return -EAGAIN; |
1d3576fd | 1233 | } |
6298a337 | 1234 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1235 | |
1236 | /* yay, writeable, do it now (without dropping page lock) */ | |
1237 | dout(" page %p snapc %p not current, but oldest\n", | |
1238 | page, snapc); | |
1239 | if (!clear_page_dirty_for_io(page)) | |
1240 | goto retry_locked; | |
1241 | r = writepage_nounlock(page, NULL); | |
1242 | if (r < 0) | |
dd2bc473 | 1243 | goto fail_unlock; |
1d3576fd SW |
1244 | goto retry_locked; |
1245 | } | |
1246 | ||
1247 | if (PageUptodate(page)) { | |
1248 | dout(" page %p already uptodate\n", page); | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | /* full page? */ | |
09cbfeaf | 1253 | if (pos_in_page == 0 && len == PAGE_SIZE) |
1d3576fd SW |
1254 | return 0; |
1255 | ||
1256 | /* past end of file? */ | |
99c88e69 | 1257 | i_size = i_size_read(inode); |
1d3576fd | 1258 | |
1d3576fd SW |
1259 | if (page_off >= i_size || |
1260 | (pos_in_page == 0 && (pos+len) >= i_size && | |
09cbfeaf | 1261 | end_in_page - pos_in_page != PAGE_SIZE)) { |
1d3576fd | 1262 | dout(" zeroing %p 0 - %d and %d - %d\n", |
09cbfeaf | 1263 | page, pos_in_page, end_in_page, (int)PAGE_SIZE); |
1d3576fd SW |
1264 | zero_user_segments(page, |
1265 | 0, pos_in_page, | |
09cbfeaf | 1266 | end_in_page, PAGE_SIZE); |
1d3576fd SW |
1267 | return 0; |
1268 | } | |
1269 | ||
1270 | /* we need to read it. */ | |
dd2bc473 YZ |
1271 | r = ceph_do_readpage(file, page); |
1272 | if (r < 0) { | |
1273 | if (r == -EINPROGRESS) | |
1274 | return -EAGAIN; | |
1275 | goto fail_unlock; | |
1276 | } | |
1d3576fd | 1277 | goto retry_locked; |
dd2bc473 | 1278 | fail_unlock: |
1d3576fd SW |
1279 | unlock_page(page); |
1280 | return r; | |
1281 | } | |
1282 | ||
4af6b225 YS |
1283 | /* |
1284 | * We are only allowed to write into/dirty the page if the page is | |
1285 | * clean, or already dirty within the same snap context. | |
1286 | */ | |
1287 | static int ceph_write_begin(struct file *file, struct address_space *mapping, | |
1288 | loff_t pos, unsigned len, unsigned flags, | |
1289 | struct page **pagep, void **fsdata) | |
1290 | { | |
496ad9aa | 1291 | struct inode *inode = file_inode(file); |
4af6b225 | 1292 | struct page *page; |
09cbfeaf | 1293 | pgoff_t index = pos >> PAGE_SHIFT; |
7971bd92 | 1294 | int r; |
4af6b225 YS |
1295 | |
1296 | do { | |
8f883c24 | 1297 | /* get a page */ |
4af6b225 | 1298 | page = grab_cache_page_write_begin(mapping, index, 0); |
7971bd92 SW |
1299 | if (!page) |
1300 | return -ENOMEM; | |
4af6b225 YS |
1301 | |
1302 | dout("write_begin file %p inode %p page %p %d~%d\n", file, | |
213c99ee | 1303 | inode, page, (int)pos, (int)len); |
4af6b225 YS |
1304 | |
1305 | r = ceph_update_writeable_page(file, pos, len, page); | |
c1d00b2d | 1306 | if (r < 0) |
09cbfeaf | 1307 | put_page(page); |
c1d00b2d TK |
1308 | else |
1309 | *pagep = page; | |
4af6b225 YS |
1310 | } while (r == -EAGAIN); |
1311 | ||
1312 | return r; | |
1313 | } | |
1314 | ||
1d3576fd SW |
1315 | /* |
1316 | * we don't do anything in here that simple_write_end doesn't do | |
5dda377c | 1317 | * except adjust dirty page accounting |
1d3576fd SW |
1318 | */ |
1319 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1320 | loff_t pos, unsigned len, unsigned copied, | |
1321 | struct page *page, void *fsdata) | |
1322 | { | |
496ad9aa | 1323 | struct inode *inode = file_inode(file); |
efb0ca76 | 1324 | bool check_cap = false; |
1d3576fd SW |
1325 | |
1326 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1327 | inode, page, (int)pos, (int)copied, (int)len); | |
1328 | ||
1329 | /* zero the stale part of the page if we did a short copy */ | |
b9de313c AV |
1330 | if (!PageUptodate(page)) { |
1331 | if (copied < len) { | |
1332 | copied = 0; | |
1333 | goto out; | |
1334 | } | |
1335 | SetPageUptodate(page); | |
1336 | } | |
1d3576fd SW |
1337 | |
1338 | /* did file size increase? */ | |
99c88e69 | 1339 | if (pos+copied > i_size_read(inode)) |
1d3576fd SW |
1340 | check_cap = ceph_inode_set_size(inode, pos+copied); |
1341 | ||
1d3576fd SW |
1342 | set_page_dirty(page); |
1343 | ||
b9de313c | 1344 | out: |
1d3576fd | 1345 | unlock_page(page); |
09cbfeaf | 1346 | put_page(page); |
1d3576fd SW |
1347 | |
1348 | if (check_cap) | |
1349 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1350 | ||
1351 | return copied; | |
1352 | } | |
1353 | ||
1354 | /* | |
1355 | * we set .direct_IO to indicate direct io is supported, but since we | |
1356 | * intercept O_DIRECT reads and writes early, this function should | |
1357 | * never get called. | |
1358 | */ | |
c8b8e32d | 1359 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
1d3576fd SW |
1360 | { |
1361 | WARN_ON(1); | |
1362 | return -EINVAL; | |
1363 | } | |
1364 | ||
1365 | const struct address_space_operations ceph_aops = { | |
1366 | .readpage = ceph_readpage, | |
1367 | .readpages = ceph_readpages, | |
1368 | .writepage = ceph_writepage, | |
1369 | .writepages = ceph_writepages_start, | |
1370 | .write_begin = ceph_write_begin, | |
1371 | .write_end = ceph_write_end, | |
1372 | .set_page_dirty = ceph_set_page_dirty, | |
1373 | .invalidatepage = ceph_invalidatepage, | |
1374 | .releasepage = ceph_releasepage, | |
1375 | .direct_IO = ceph_direct_io, | |
1376 | }; | |
1377 | ||
4f7e89f6 YZ |
1378 | static void ceph_block_sigs(sigset_t *oldset) |
1379 | { | |
1380 | sigset_t mask; | |
1381 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
1382 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
1383 | } | |
1384 | ||
1385 | static void ceph_restore_sigs(sigset_t *oldset) | |
1386 | { | |
1387 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
1388 | } | |
1d3576fd SW |
1389 | |
1390 | /* | |
1391 | * vm ops | |
1392 | */ | |
11bac800 | 1393 | static int ceph_filemap_fault(struct vm_fault *vmf) |
61f68816 | 1394 | { |
11bac800 | 1395 | struct vm_area_struct *vma = vmf->vma; |
61f68816 YZ |
1396 | struct inode *inode = file_inode(vma->vm_file); |
1397 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1398 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1399 | struct page *pinned_page = NULL; |
09cbfeaf | 1400 | loff_t off = vmf->pgoff << PAGE_SHIFT; |
61f68816 | 1401 | int want, got, ret; |
4f7e89f6 YZ |
1402 | sigset_t oldset; |
1403 | ||
1404 | ceph_block_sigs(&oldset); | |
61f68816 YZ |
1405 | |
1406 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
09cbfeaf | 1407 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
61f68816 YZ |
1408 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1409 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1410 | else | |
1411 | want = CEPH_CAP_FILE_CACHE; | |
4f7e89f6 YZ |
1412 | |
1413 | got = 0; | |
1414 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); | |
6ce026e4 | 1415 | if (ret < 0) |
4f7e89f6 | 1416 | goto out_restore; |
6ce026e4 | 1417 | |
61f68816 | 1418 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
09cbfeaf | 1419 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
61f68816 | 1420 | |
83701246 | 1421 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
2b1ac852 YZ |
1422 | ci->i_inline_version == CEPH_INLINE_NONE) { |
1423 | current->journal_info = vma->vm_file; | |
11bac800 | 1424 | ret = filemap_fault(vmf); |
2b1ac852 YZ |
1425 | current->journal_info = NULL; |
1426 | } else | |
83701246 | 1427 | ret = -EAGAIN; |
61f68816 YZ |
1428 | |
1429 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", | |
09cbfeaf | 1430 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); |
3738daa6 | 1431 | if (pinned_page) |
09cbfeaf | 1432 | put_page(pinned_page); |
61f68816 YZ |
1433 | ceph_put_cap_refs(ci, got); |
1434 | ||
83701246 | 1435 | if (ret != -EAGAIN) |
4f7e89f6 | 1436 | goto out_restore; |
83701246 YZ |
1437 | |
1438 | /* read inline data */ | |
09cbfeaf | 1439 | if (off >= PAGE_SIZE) { |
83701246 YZ |
1440 | /* does not support inline data > PAGE_SIZE */ |
1441 | ret = VM_FAULT_SIGBUS; | |
1442 | } else { | |
1443 | int ret1; | |
1444 | struct address_space *mapping = inode->i_mapping; | |
1445 | struct page *page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1446 | mapping_gfp_constraint(mapping, |
1447 | ~__GFP_FS)); | |
83701246 YZ |
1448 | if (!page) { |
1449 | ret = VM_FAULT_OOM; | |
4f7e89f6 | 1450 | goto out_inline; |
83701246 YZ |
1451 | } |
1452 | ret1 = __ceph_do_getattr(inode, page, | |
1453 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1454 | if (ret1 < 0 || off >= i_size_read(inode)) { | |
1455 | unlock_page(page); | |
09cbfeaf | 1456 | put_page(page); |
6ce026e4 YZ |
1457 | if (ret1 < 0) |
1458 | ret = ret1; | |
1459 | else | |
1460 | ret = VM_FAULT_SIGBUS; | |
4f7e89f6 | 1461 | goto out_inline; |
83701246 | 1462 | } |
09cbfeaf KS |
1463 | if (ret1 < PAGE_SIZE) |
1464 | zero_user_segment(page, ret1, PAGE_SIZE); | |
83701246 YZ |
1465 | else |
1466 | flush_dcache_page(page); | |
1467 | SetPageUptodate(page); | |
1468 | vmf->page = page; | |
1469 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
4f7e89f6 YZ |
1470 | out_inline: |
1471 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", | |
1472 | inode, off, (size_t)PAGE_SIZE, ret); | |
83701246 | 1473 | } |
4f7e89f6 YZ |
1474 | out_restore: |
1475 | ceph_restore_sigs(&oldset); | |
6ce026e4 YZ |
1476 | if (ret < 0) |
1477 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1478 | ||
61f68816 YZ |
1479 | return ret; |
1480 | } | |
1d3576fd SW |
1481 | |
1482 | /* | |
1483 | * Reuse write_begin here for simplicity. | |
1484 | */ | |
11bac800 | 1485 | static int ceph_page_mkwrite(struct vm_fault *vmf) |
1d3576fd | 1486 | { |
11bac800 | 1487 | struct vm_area_struct *vma = vmf->vma; |
496ad9aa | 1488 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1489 | struct ceph_inode_info *ci = ceph_inode(inode); |
1490 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
f66fd9f0 | 1491 | struct ceph_cap_flush *prealloc_cf; |
61f68816 | 1492 | struct page *page = vmf->page; |
6285bc23 | 1493 | loff_t off = page_offset(page); |
61f68816 YZ |
1494 | loff_t size = i_size_read(inode); |
1495 | size_t len; | |
1496 | int want, got, ret; | |
4f7e89f6 | 1497 | sigset_t oldset; |
3ca9c3bd | 1498 | |
f66fd9f0 YZ |
1499 | prealloc_cf = ceph_alloc_cap_flush(); |
1500 | if (!prealloc_cf) | |
6ce026e4 | 1501 | return VM_FAULT_OOM; |
f66fd9f0 | 1502 | |
4f7e89f6 | 1503 | ceph_block_sigs(&oldset); |
f66fd9f0 | 1504 | |
28127bdd YZ |
1505 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1506 | struct page *locked_page = NULL; | |
1507 | if (off == 0) { | |
1508 | lock_page(page); | |
1509 | locked_page = page; | |
1510 | } | |
1511 | ret = ceph_uninline_data(vma->vm_file, locked_page); | |
1512 | if (locked_page) | |
1513 | unlock_page(locked_page); | |
6ce026e4 | 1514 | if (ret < 0) |
f66fd9f0 | 1515 | goto out_free; |
28127bdd YZ |
1516 | } |
1517 | ||
09cbfeaf KS |
1518 | if (off + PAGE_SIZE <= size) |
1519 | len = PAGE_SIZE; | |
1d3576fd | 1520 | else |
09cbfeaf | 1521 | len = size & ~PAGE_MASK; |
1d3576fd | 1522 | |
61f68816 YZ |
1523 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1524 | inode, ceph_vinop(inode), off, len, size); | |
1525 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1526 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1527 | else | |
1528 | want = CEPH_CAP_FILE_BUFFER; | |
4f7e89f6 YZ |
1529 | |
1530 | got = 0; | |
1531 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, | |
1532 | &got, NULL); | |
6ce026e4 | 1533 | if (ret < 0) |
4f7e89f6 | 1534 | goto out_free; |
6ce026e4 | 1535 | |
61f68816 YZ |
1536 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
1537 | inode, off, len, ceph_cap_string(got)); | |
1538 | ||
1539 | /* Update time before taking page lock */ | |
1540 | file_update_time(vma->vm_file); | |
4af6b225 | 1541 | |
f0b33df5 YZ |
1542 | do { |
1543 | lock_page(page); | |
4af6b225 | 1544 | |
f0b33df5 YZ |
1545 | if ((off > size) || (page->mapping != inode->i_mapping)) { |
1546 | unlock_page(page); | |
1547 | ret = VM_FAULT_NOPAGE; | |
1548 | break; | |
1549 | } | |
1550 | ||
1551 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); | |
1552 | if (ret >= 0) { | |
1553 | /* success. we'll keep the page locked. */ | |
1554 | set_page_dirty(page); | |
1555 | ret = VM_FAULT_LOCKED; | |
1556 | } | |
1557 | } while (ret == -EAGAIN); | |
4af6b225 | 1558 | |
28127bdd YZ |
1559 | if (ret == VM_FAULT_LOCKED || |
1560 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1561 | int dirty; |
1562 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1563 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1564 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1565 | &prealloc_cf); | |
61f68816 YZ |
1566 | spin_unlock(&ci->i_ceph_lock); |
1567 | if (dirty) | |
1568 | __mark_inode_dirty(inode, dirty); | |
1569 | } | |
1570 | ||
1571 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", | |
1572 | inode, off, len, ceph_cap_string(got), ret); | |
1573 | ceph_put_cap_refs(ci, got); | |
f66fd9f0 | 1574 | out_free: |
4f7e89f6 | 1575 | ceph_restore_sigs(&oldset); |
f66fd9f0 | 1576 | ceph_free_cap_flush(prealloc_cf); |
6ce026e4 YZ |
1577 | if (ret < 0) |
1578 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1d3576fd SW |
1579 | return ret; |
1580 | } | |
1581 | ||
31c542a1 YZ |
1582 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1583 | char *data, size_t len) | |
1584 | { | |
1585 | struct address_space *mapping = inode->i_mapping; | |
1586 | struct page *page; | |
1587 | ||
1588 | if (locked_page) { | |
1589 | page = locked_page; | |
1590 | } else { | |
1591 | if (i_size_read(inode) == 0) | |
1592 | return; | |
1593 | page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1594 | mapping_gfp_constraint(mapping, |
1595 | ~__GFP_FS)); | |
31c542a1 YZ |
1596 | if (!page) |
1597 | return; | |
1598 | if (PageUptodate(page)) { | |
1599 | unlock_page(page); | |
09cbfeaf | 1600 | put_page(page); |
31c542a1 YZ |
1601 | return; |
1602 | } | |
1603 | } | |
1604 | ||
0668ff52 | 1605 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1606 | inode, ceph_vinop(inode), len, locked_page); |
1607 | ||
1608 | if (len > 0) { | |
1609 | void *kaddr = kmap_atomic(page); | |
1610 | memcpy(kaddr, data, len); | |
1611 | kunmap_atomic(kaddr); | |
1612 | } | |
1613 | ||
1614 | if (page != locked_page) { | |
09cbfeaf KS |
1615 | if (len < PAGE_SIZE) |
1616 | zero_user_segment(page, len, PAGE_SIZE); | |
31c542a1 YZ |
1617 | else |
1618 | flush_dcache_page(page); | |
1619 | ||
1620 | SetPageUptodate(page); | |
1621 | unlock_page(page); | |
09cbfeaf | 1622 | put_page(page); |
31c542a1 YZ |
1623 | } |
1624 | } | |
1625 | ||
28127bdd YZ |
1626 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1627 | { | |
1628 | struct inode *inode = file_inode(filp); | |
1629 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1630 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1631 | struct ceph_osd_request *req; | |
1632 | struct page *page = NULL; | |
1633 | u64 len, inline_version; | |
1634 | int err = 0; | |
1635 | bool from_pagecache = false; | |
1636 | ||
1637 | spin_lock(&ci->i_ceph_lock); | |
1638 | inline_version = ci->i_inline_version; | |
1639 | spin_unlock(&ci->i_ceph_lock); | |
1640 | ||
1641 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1642 | inode, ceph_vinop(inode), inline_version); | |
1643 | ||
1644 | if (inline_version == 1 || /* initial version, no data */ | |
1645 | inline_version == CEPH_INLINE_NONE) | |
1646 | goto out; | |
1647 | ||
1648 | if (locked_page) { | |
1649 | page = locked_page; | |
1650 | WARN_ON(!PageUptodate(page)); | |
1651 | } else if (ceph_caps_issued(ci) & | |
1652 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1653 | page = find_get_page(inode->i_mapping, 0); | |
1654 | if (page) { | |
1655 | if (PageUptodate(page)) { | |
1656 | from_pagecache = true; | |
1657 | lock_page(page); | |
1658 | } else { | |
09cbfeaf | 1659 | put_page(page); |
28127bdd YZ |
1660 | page = NULL; |
1661 | } | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | if (page) { | |
1666 | len = i_size_read(inode); | |
09cbfeaf KS |
1667 | if (len > PAGE_SIZE) |
1668 | len = PAGE_SIZE; | |
28127bdd YZ |
1669 | } else { |
1670 | page = __page_cache_alloc(GFP_NOFS); | |
1671 | if (!page) { | |
1672 | err = -ENOMEM; | |
1673 | goto out; | |
1674 | } | |
1675 | err = __ceph_do_getattr(inode, page, | |
1676 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1677 | if (err < 0) { | |
1678 | /* no inline data */ | |
1679 | if (err == -ENODATA) | |
1680 | err = 0; | |
1681 | goto out; | |
1682 | } | |
1683 | len = err; | |
1684 | } | |
1685 | ||
1686 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1687 | ceph_vino(inode), 0, &len, 0, 1, | |
54ea0046 | 1688 | CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, |
34b759b4 | 1689 | NULL, 0, 0, false); |
28127bdd YZ |
1690 | if (IS_ERR(req)) { |
1691 | err = PTR_ERR(req); | |
1692 | goto out; | |
1693 | } | |
1694 | ||
bb873b53 | 1695 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1696 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1697 | if (!err) | |
1698 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1699 | ceph_osdc_put_request(req); | |
1700 | if (err < 0) | |
1701 | goto out; | |
1702 | ||
1703 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1704 | ceph_vino(inode), 0, &len, 1, 3, | |
54ea0046 | 1705 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
34b759b4 ID |
1706 | NULL, ci->i_truncate_seq, |
1707 | ci->i_truncate_size, false); | |
28127bdd YZ |
1708 | if (IS_ERR(req)) { |
1709 | err = PTR_ERR(req); | |
1710 | goto out; | |
1711 | } | |
1712 | ||
1713 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1714 | ||
ec137c10 YZ |
1715 | { |
1716 | __le64 xattr_buf = cpu_to_le64(inline_version); | |
1717 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1718 | "inline_version", &xattr_buf, | |
1719 | sizeof(xattr_buf), | |
1720 | CEPH_OSD_CMPXATTR_OP_GT, | |
1721 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1722 | if (err) | |
1723 | goto out_put; | |
1724 | } | |
1725 | ||
1726 | { | |
1727 | char xattr_buf[32]; | |
1728 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), | |
1729 | "%llu", inline_version); | |
1730 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1731 | "inline_version", | |
1732 | xattr_buf, xattr_len, 0, 0); | |
1733 | if (err) | |
1734 | goto out_put; | |
1735 | } | |
28127bdd | 1736 | |
bb873b53 | 1737 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1738 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1739 | if (!err) | |
1740 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1741 | out_put: | |
1742 | ceph_osdc_put_request(req); | |
1743 | if (err == -ECANCELED) | |
1744 | err = 0; | |
1745 | out: | |
1746 | if (page && page != locked_page) { | |
1747 | if (from_pagecache) { | |
1748 | unlock_page(page); | |
09cbfeaf | 1749 | put_page(page); |
28127bdd YZ |
1750 | } else |
1751 | __free_pages(page, 0); | |
1752 | } | |
1753 | ||
1754 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1755 | inode, ceph_vinop(inode), inline_version, err); | |
1756 | return err; | |
1757 | } | |
1758 | ||
7cbea8dc | 1759 | static const struct vm_operations_struct ceph_vmops = { |
61f68816 | 1760 | .fault = ceph_filemap_fault, |
1d3576fd SW |
1761 | .page_mkwrite = ceph_page_mkwrite, |
1762 | }; | |
1763 | ||
1764 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1765 | { | |
1766 | struct address_space *mapping = file->f_mapping; | |
1767 | ||
1768 | if (!mapping->a_ops->readpage) | |
1769 | return -ENOEXEC; | |
1770 | file_accessed(file); | |
1771 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1772 | return 0; |
1773 | } | |
10183a69 YZ |
1774 | |
1775 | enum { | |
1776 | POOL_READ = 1, | |
1777 | POOL_WRITE = 2, | |
1778 | }; | |
1779 | ||
779fe0fb YZ |
1780 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
1781 | s64 pool, struct ceph_string *pool_ns) | |
10183a69 YZ |
1782 | { |
1783 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1784 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1785 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; | |
1786 | struct rb_node **p, *parent; | |
1787 | struct ceph_pool_perm *perm; | |
1788 | struct page **pages; | |
779fe0fb | 1789 | size_t pool_ns_len; |
10183a69 YZ |
1790 | int err = 0, err2 = 0, have = 0; |
1791 | ||
1792 | down_read(&mdsc->pool_perm_rwsem); | |
1793 | p = &mdsc->pool_perm_tree.rb_node; | |
1794 | while (*p) { | |
1795 | perm = rb_entry(*p, struct ceph_pool_perm, node); | |
1796 | if (pool < perm->pool) | |
1797 | p = &(*p)->rb_left; | |
1798 | else if (pool > perm->pool) | |
1799 | p = &(*p)->rb_right; | |
1800 | else { | |
779fe0fb YZ |
1801 | int ret = ceph_compare_string(pool_ns, |
1802 | perm->pool_ns, | |
1803 | perm->pool_ns_len); | |
1804 | if (ret < 0) | |
1805 | p = &(*p)->rb_left; | |
1806 | else if (ret > 0) | |
1807 | p = &(*p)->rb_right; | |
1808 | else { | |
1809 | have = perm->perm; | |
1810 | break; | |
1811 | } | |
10183a69 YZ |
1812 | } |
1813 | } | |
1814 | up_read(&mdsc->pool_perm_rwsem); | |
1815 | if (*p) | |
1816 | goto out; | |
1817 | ||
779fe0fb YZ |
1818 | if (pool_ns) |
1819 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", | |
1820 | pool, (int)pool_ns->len, pool_ns->str); | |
1821 | else | |
1822 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); | |
10183a69 YZ |
1823 | |
1824 | down_write(&mdsc->pool_perm_rwsem); | |
779fe0fb | 1825 | p = &mdsc->pool_perm_tree.rb_node; |
10183a69 YZ |
1826 | parent = NULL; |
1827 | while (*p) { | |
1828 | parent = *p; | |
1829 | perm = rb_entry(parent, struct ceph_pool_perm, node); | |
1830 | if (pool < perm->pool) | |
1831 | p = &(*p)->rb_left; | |
1832 | else if (pool > perm->pool) | |
1833 | p = &(*p)->rb_right; | |
1834 | else { | |
779fe0fb YZ |
1835 | int ret = ceph_compare_string(pool_ns, |
1836 | perm->pool_ns, | |
1837 | perm->pool_ns_len); | |
1838 | if (ret < 0) | |
1839 | p = &(*p)->rb_left; | |
1840 | else if (ret > 0) | |
1841 | p = &(*p)->rb_right; | |
1842 | else { | |
1843 | have = perm->perm; | |
1844 | break; | |
1845 | } | |
10183a69 YZ |
1846 | } |
1847 | } | |
1848 | if (*p) { | |
1849 | up_write(&mdsc->pool_perm_rwsem); | |
1850 | goto out; | |
1851 | } | |
1852 | ||
34b759b4 | 1853 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1854 | 1, false, GFP_NOFS); |
1855 | if (!rd_req) { | |
1856 | err = -ENOMEM; | |
1857 | goto out_unlock; | |
1858 | } | |
1859 | ||
1860 | rd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1861 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); | |
1862 | rd_req->r_base_oloc.pool = pool; | |
779fe0fb YZ |
1863 | if (pool_ns) |
1864 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); | |
d30291b9 | 1865 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
10183a69 | 1866 | |
13d1ad16 ID |
1867 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
1868 | if (err) | |
1869 | goto out_unlock; | |
10183a69 | 1870 | |
34b759b4 | 1871 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1872 | 1, false, GFP_NOFS); |
1873 | if (!wr_req) { | |
1874 | err = -ENOMEM; | |
1875 | goto out_unlock; | |
1876 | } | |
1877 | ||
54ea0046 | 1878 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE; |
10183a69 | 1879 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
63244fa1 | 1880 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
d30291b9 | 1881 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
10183a69 | 1882 | |
13d1ad16 ID |
1883 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
1884 | if (err) | |
1885 | goto out_unlock; | |
10183a69 YZ |
1886 | |
1887 | /* one page should be large enough for STAT data */ | |
1888 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); | |
1889 | if (IS_ERR(pages)) { | |
1890 | err = PTR_ERR(pages); | |
1891 | goto out_unlock; | |
1892 | } | |
1893 | ||
1894 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, | |
1895 | 0, false, true); | |
10183a69 YZ |
1896 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
1897 | ||
bb873b53 | 1898 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
a1f4020a | 1899 | wr_req->r_abort_on_full = true; |
10183a69 YZ |
1900 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
1901 | ||
1902 | if (!err) | |
1903 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); | |
1904 | if (!err2) | |
1905 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); | |
1906 | ||
1907 | if (err >= 0 || err == -ENOENT) | |
1908 | have |= POOL_READ; | |
1909 | else if (err != -EPERM) | |
1910 | goto out_unlock; | |
1911 | ||
1912 | if (err2 == 0 || err2 == -EEXIST) | |
1913 | have |= POOL_WRITE; | |
1914 | else if (err2 != -EPERM) { | |
1915 | err = err2; | |
1916 | goto out_unlock; | |
1917 | } | |
1918 | ||
779fe0fb YZ |
1919 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
1920 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); | |
10183a69 YZ |
1921 | if (!perm) { |
1922 | err = -ENOMEM; | |
1923 | goto out_unlock; | |
1924 | } | |
1925 | ||
1926 | perm->pool = pool; | |
1927 | perm->perm = have; | |
779fe0fb YZ |
1928 | perm->pool_ns_len = pool_ns_len; |
1929 | if (pool_ns_len > 0) | |
1930 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); | |
1931 | perm->pool_ns[pool_ns_len] = 0; | |
1932 | ||
10183a69 YZ |
1933 | rb_link_node(&perm->node, parent, p); |
1934 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); | |
1935 | err = 0; | |
1936 | out_unlock: | |
1937 | up_write(&mdsc->pool_perm_rwsem); | |
1938 | ||
3ed97d63 ID |
1939 | ceph_osdc_put_request(rd_req); |
1940 | ceph_osdc_put_request(wr_req); | |
10183a69 YZ |
1941 | out: |
1942 | if (!err) | |
1943 | err = have; | |
779fe0fb YZ |
1944 | if (pool_ns) |
1945 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", | |
1946 | pool, (int)pool_ns->len, pool_ns->str, err); | |
1947 | else | |
1948 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); | |
10183a69 YZ |
1949 | return err; |
1950 | } | |
1951 | ||
1952 | int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) | |
1953 | { | |
7627151e | 1954 | s64 pool; |
779fe0fb | 1955 | struct ceph_string *pool_ns; |
10183a69 YZ |
1956 | int ret, flags; |
1957 | ||
80e80fbb YZ |
1958 | if (ci->i_vino.snap != CEPH_NOSNAP) { |
1959 | /* | |
1960 | * Pool permission check needs to write to the first object. | |
1961 | * But for snapshot, head of the first object may have alread | |
1962 | * been deleted. Skip check to avoid creating orphan object. | |
1963 | */ | |
1964 | return 0; | |
1965 | } | |
1966 | ||
10183a69 YZ |
1967 | if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), |
1968 | NOPOOLPERM)) | |
1969 | return 0; | |
1970 | ||
1971 | spin_lock(&ci->i_ceph_lock); | |
1972 | flags = ci->i_ceph_flags; | |
7627151e | 1973 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
1974 | spin_unlock(&ci->i_ceph_lock); |
1975 | check: | |
1976 | if (flags & CEPH_I_POOL_PERM) { | |
1977 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { | |
7627151e | 1978 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
10183a69 YZ |
1979 | pool); |
1980 | return -EPERM; | |
1981 | } | |
1982 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { | |
7627151e | 1983 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
10183a69 YZ |
1984 | pool); |
1985 | return -EPERM; | |
1986 | } | |
1987 | return 0; | |
1988 | } | |
1989 | ||
779fe0fb YZ |
1990 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
1991 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); | |
1992 | ceph_put_string(pool_ns); | |
10183a69 YZ |
1993 | if (ret < 0) |
1994 | return ret; | |
1995 | ||
1996 | flags = CEPH_I_POOL_PERM; | |
1997 | if (ret & POOL_READ) | |
1998 | flags |= CEPH_I_POOL_RD; | |
1999 | if (ret & POOL_WRITE) | |
2000 | flags |= CEPH_I_POOL_WR; | |
2001 | ||
2002 | spin_lock(&ci->i_ceph_lock); | |
779fe0fb YZ |
2003 | if (pool == ci->i_layout.pool_id && |
2004 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { | |
2005 | ci->i_ceph_flags |= flags; | |
10183a69 | 2006 | } else { |
7627151e | 2007 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2008 | flags = ci->i_ceph_flags; |
2009 | } | |
2010 | spin_unlock(&ci->i_ceph_lock); | |
2011 | goto check; | |
2012 | } | |
2013 | ||
2014 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) | |
2015 | { | |
2016 | struct ceph_pool_perm *perm; | |
2017 | struct rb_node *n; | |
2018 | ||
2019 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { | |
2020 | n = rb_first(&mdsc->pool_perm_tree); | |
2021 | perm = rb_entry(n, struct ceph_pool_perm, node); | |
2022 | rb_erase(n, &mdsc->pool_perm_tree); | |
2023 | kfree(perm); | |
2024 | } | |
2025 | } |