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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> | |
11 | ||
12 | #include "super.h" | |
3d14c5d2 | 13 | #include "mds_client.h" |
99ccbd22 | 14 | #include "cache.h" |
3d14c5d2 | 15 | #include <linux/ceph/osd_client.h> |
1d3576fd SW |
16 | |
17 | /* | |
18 | * Ceph address space ops. | |
19 | * | |
20 | * There are a few funny things going on here. | |
21 | * | |
22 | * The page->private field is used to reference a struct | |
23 | * ceph_snap_context for _every_ dirty page. This indicates which | |
24 | * snapshot the page was logically dirtied in, and thus which snap | |
25 | * context needs to be associated with the osd write during writeback. | |
26 | * | |
27 | * Similarly, struct ceph_inode_info maintains a set of counters to | |
25985edc | 28 | * count dirty pages on the inode. In the absence of snapshots, |
1d3576fd SW |
29 | * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. |
30 | * | |
31 | * When a snapshot is taken (that is, when the client receives | |
32 | * notification that a snapshot was taken), each inode with caps and | |
33 | * with dirty pages (dirty pages implies there is a cap) gets a new | |
34 | * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending | |
35 | * order, new snaps go to the tail). The i_wrbuffer_ref_head count is | |
36 | * moved to capsnap->dirty. (Unless a sync write is currently in | |
37 | * progress. In that case, the capsnap is said to be "pending", new | |
38 | * writes cannot start, and the capsnap isn't "finalized" until the | |
39 | * write completes (or fails) and a final size/mtime for the inode for | |
40 | * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. | |
41 | * | |
42 | * On writeback, we must submit writes to the osd IN SNAP ORDER. So, | |
43 | * we look for the first capsnap in i_cap_snaps and write out pages in | |
44 | * that snap context _only_. Then we move on to the next capsnap, | |
45 | * eventually reaching the "live" or "head" context (i.e., pages that | |
46 | * are not yet snapped) and are writing the most recently dirtied | |
47 | * pages. | |
48 | * | |
49 | * Invalidate and so forth must take care to ensure the dirty page | |
50 | * accounting is preserved. | |
51 | */ | |
52 | ||
2baba250 YS |
53 | #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) |
54 | #define CONGESTION_OFF_THRESH(congestion_kb) \ | |
55 | (CONGESTION_ON_THRESH(congestion_kb) - \ | |
56 | (CONGESTION_ON_THRESH(congestion_kb) >> 2)) | |
57 | ||
61600ef8 YZ |
58 | static inline struct ceph_snap_context *page_snap_context(struct page *page) |
59 | { | |
60 | if (PagePrivate(page)) | |
61 | return (void *)page->private; | |
62 | return NULL; | |
63 | } | |
1d3576fd SW |
64 | |
65 | /* | |
66 | * Dirty a page. Optimistically adjust accounting, on the assumption | |
67 | * that we won't race with invalidate. If we do, readjust. | |
68 | */ | |
69 | static int ceph_set_page_dirty(struct page *page) | |
70 | { | |
71 | struct address_space *mapping = page->mapping; | |
72 | struct inode *inode; | |
73 | struct ceph_inode_info *ci; | |
1d3576fd | 74 | struct ceph_snap_context *snapc; |
7d6e1f54 | 75 | int ret; |
1d3576fd SW |
76 | |
77 | if (unlikely(!mapping)) | |
78 | return !TestSetPageDirty(page); | |
79 | ||
7d6e1f54 | 80 | if (PageDirty(page)) { |
1d3576fd SW |
81 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
82 | mapping->host, page, page->index); | |
7d6e1f54 | 83 | BUG_ON(!PagePrivate(page)); |
1d3576fd SW |
84 | return 0; |
85 | } | |
86 | ||
87 | inode = mapping->host; | |
88 | ci = ceph_inode(inode); | |
89 | ||
1d3576fd | 90 | /* dirty the head */ |
be655596 | 91 | spin_lock(&ci->i_ceph_lock); |
5dda377c YZ |
92 | BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference |
93 | if (__ceph_have_pending_cap_snap(ci)) { | |
94 | struct ceph_cap_snap *capsnap = | |
95 | list_last_entry(&ci->i_cap_snaps, | |
96 | struct ceph_cap_snap, | |
97 | ci_item); | |
98 | snapc = ceph_get_snap_context(capsnap->context); | |
99 | capsnap->dirty_pages++; | |
100 | } else { | |
101 | BUG_ON(!ci->i_head_snapc); | |
102 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
103 | ++ci->i_wrbuffer_ref_head; | |
104 | } | |
1d3576fd | 105 | if (ci->i_wrbuffer_ref == 0) |
0444d76a | 106 | ihold(inode); |
1d3576fd SW |
107 | ++ci->i_wrbuffer_ref; |
108 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " | |
109 | "snapc %p seq %lld (%d snaps)\n", | |
110 | mapping->host, page, page->index, | |
111 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, | |
112 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
113 | snapc, snapc->seq, snapc->num_snaps); | |
be655596 | 114 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd | 115 | |
7d6e1f54 SZ |
116 | /* |
117 | * Reference snap context in page->private. Also set | |
118 | * PagePrivate so that we get invalidatepage callback. | |
119 | */ | |
120 | BUG_ON(PagePrivate(page)); | |
121 | page->private = (unsigned long)snapc; | |
122 | SetPagePrivate(page); | |
1d3576fd | 123 | |
7d6e1f54 SZ |
124 | ret = __set_page_dirty_nobuffers(page); |
125 | WARN_ON(!PageLocked(page)); | |
126 | WARN_ON(!page->mapping); | |
1d3576fd | 127 | |
7d6e1f54 | 128 | return ret; |
1d3576fd SW |
129 | } |
130 | ||
131 | /* | |
132 | * If we are truncating the full page (i.e. offset == 0), adjust the | |
133 | * dirty page counters appropriately. Only called if there is private | |
134 | * data on the page. | |
135 | */ | |
d47992f8 LC |
136 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
137 | unsigned int length) | |
1d3576fd | 138 | { |
4ce1e9ad | 139 | struct inode *inode; |
1d3576fd | 140 | struct ceph_inode_info *ci; |
61600ef8 | 141 | struct ceph_snap_context *snapc = page_snap_context(page); |
1d3576fd | 142 | |
4ce1e9ad | 143 | inode = page->mapping->host; |
b150f5c1 MT |
144 | ci = ceph_inode(inode); |
145 | ||
09cbfeaf | 146 | if (offset != 0 || length != PAGE_SIZE) { |
b150f5c1 MT |
147 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
148 | inode, page, page->index, offset, length); | |
149 | return; | |
150 | } | |
4ce1e9ad | 151 | |
99ccbd22 MT |
152 | ceph_invalidate_fscache_page(inode, page); |
153 | ||
154 | if (!PagePrivate(page)) | |
155 | return; | |
156 | ||
1d3576fd SW |
157 | /* |
158 | * We can get non-dirty pages here due to races between | |
159 | * set_page_dirty and truncate_complete_page; just spit out a | |
160 | * warning, in case we end up with accounting problems later. | |
161 | */ | |
162 | if (!PageDirty(page)) | |
163 | pr_err("%p invalidatepage %p page not dirty\n", inode, page); | |
164 | ||
b150f5c1 | 165 | ClearPageChecked(page); |
1d3576fd | 166 | |
b150f5c1 MT |
167 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
168 | inode, page, page->index); | |
169 | ||
170 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
171 | ceph_put_snap_context(snapc); | |
172 | page->private = 0; | |
173 | ClearPagePrivate(page); | |
1d3576fd SW |
174 | } |
175 | ||
1d3576fd SW |
176 | static int ceph_releasepage(struct page *page, gfp_t g) |
177 | { | |
e55f1a18 N |
178 | dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, |
179 | page, page->index, PageDirty(page) ? "" : "not "); | |
99ccbd22 MT |
180 | |
181 | /* Can we release the page from the cache? */ | |
182 | if (!ceph_release_fscache_page(page, g)) | |
183 | return 0; | |
184 | ||
185 | return !PagePrivate(page); | |
1d3576fd SW |
186 | } |
187 | ||
188 | /* | |
189 | * read a single page, without unlocking it. | |
190 | */ | |
191 | static int readpage_nounlock(struct file *filp, struct page *page) | |
192 | { | |
496ad9aa | 193 | struct inode *inode = file_inode(filp); |
1d3576fd | 194 | struct ceph_inode_info *ci = ceph_inode(inode); |
99ccbd22 | 195 | struct ceph_osd_client *osdc = |
3d14c5d2 | 196 | &ceph_inode_to_client(inode)->client->osdc; |
1d3576fd | 197 | int err = 0; |
83701246 | 198 | u64 off = page_offset(page); |
09cbfeaf | 199 | u64 len = PAGE_SIZE; |
1d3576fd | 200 | |
83701246 | 201 | if (off >= i_size_read(inode)) { |
09cbfeaf | 202 | zero_user_segment(page, 0, PAGE_SIZE); |
83701246 YZ |
203 | SetPageUptodate(page); |
204 | return 0; | |
205 | } | |
99ccbd22 | 206 | |
fcc02d2a YZ |
207 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
208 | /* | |
209 | * Uptodate inline data should have been added | |
210 | * into page cache while getting Fcr caps. | |
211 | */ | |
212 | if (off == 0) | |
213 | return -EINVAL; | |
09cbfeaf | 214 | zero_user_segment(page, 0, PAGE_SIZE); |
fcc02d2a YZ |
215 | SetPageUptodate(page); |
216 | return 0; | |
217 | } | |
83701246 YZ |
218 | |
219 | err = ceph_readpage_from_fscache(inode, page); | |
99ccbd22 MT |
220 | if (err == 0) |
221 | goto out; | |
222 | ||
1d3576fd SW |
223 | dout("readpage inode %p file %p page %p index %lu\n", |
224 | inode, filp, page, page->index); | |
225 | err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, | |
83701246 | 226 | off, &len, |
1d3576fd | 227 | ci->i_truncate_seq, ci->i_truncate_size, |
b7495fc2 | 228 | &page, 1, 0); |
1d3576fd SW |
229 | if (err == -ENOENT) |
230 | err = 0; | |
231 | if (err < 0) { | |
232 | SetPageError(page); | |
18302805 | 233 | ceph_fscache_readpage_cancel(inode, page); |
1d3576fd | 234 | goto out; |
1d3576fd | 235 | } |
09cbfeaf | 236 | if (err < PAGE_SIZE) |
23cd573b | 237 | /* zero fill remainder of page */ |
09cbfeaf | 238 | zero_user_segment(page, err, PAGE_SIZE); |
23cd573b ZZ |
239 | else |
240 | flush_dcache_page(page); | |
1d3576fd | 241 | |
23cd573b ZZ |
242 | SetPageUptodate(page); |
243 | ceph_readpage_to_fscache(inode, page); | |
99ccbd22 | 244 | |
1d3576fd SW |
245 | out: |
246 | return err < 0 ? err : 0; | |
247 | } | |
248 | ||
249 | static int ceph_readpage(struct file *filp, struct page *page) | |
250 | { | |
251 | int r = readpage_nounlock(filp, page); | |
252 | unlock_page(page); | |
253 | return r; | |
254 | } | |
255 | ||
256 | /* | |
7c272194 | 257 | * Finish an async read(ahead) op. |
1d3576fd | 258 | */ |
85e084fe | 259 | static void finish_read(struct ceph_osd_request *req) |
1d3576fd | 260 | { |
7c272194 | 261 | struct inode *inode = req->r_inode; |
87060c10 | 262 | struct ceph_osd_data *osd_data; |
85e084fe ID |
263 | int rc = req->r_result <= 0 ? req->r_result : 0; |
264 | int bytes = req->r_result >= 0 ? req->r_result : 0; | |
e0c59487 | 265 | int num_pages; |
7c272194 | 266 | int i; |
1d3576fd | 267 | |
7c272194 SW |
268 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
269 | ||
270 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 271 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
272 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
273 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
274 | (u64)osd_data->length); | |
e0c59487 | 275 | for (i = 0; i < num_pages; i++) { |
87060c10 | 276 | struct page *page = osd_data->pages[i]; |
7c272194 | 277 | |
368e3585 YZ |
278 | if (rc < 0 && rc != -ENOENT) { |
279 | ceph_fscache_readpage_cancel(inode, page); | |
f36132a7 | 280 | goto unlock; |
368e3585 | 281 | } |
09cbfeaf | 282 | if (bytes < (int)PAGE_SIZE) { |
7c272194 SW |
283 | /* zero (remainder of) page */ |
284 | int s = bytes < 0 ? 0 : bytes; | |
09cbfeaf | 285 | zero_user_segment(page, s, PAGE_SIZE); |
1d3576fd | 286 | } |
7c272194 SW |
287 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
288 | page->index); | |
289 | flush_dcache_page(page); | |
290 | SetPageUptodate(page); | |
99ccbd22 | 291 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 292 | unlock: |
7c272194 | 293 | unlock_page(page); |
09cbfeaf KS |
294 | put_page(page); |
295 | bytes -= PAGE_SIZE; | |
1d3576fd | 296 | } |
87060c10 | 297 | kfree(osd_data->pages); |
1d3576fd SW |
298 | } |
299 | ||
300 | /* | |
7c272194 SW |
301 | * start an async read(ahead) operation. return nr_pages we submitted |
302 | * a read for on success, or negative error code. | |
1d3576fd | 303 | */ |
0d66a487 | 304 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
1d3576fd | 305 | { |
3d14c5d2 YS |
306 | struct ceph_osd_client *osdc = |
307 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 SW |
308 | struct ceph_inode_info *ci = ceph_inode(inode); |
309 | struct page *page = list_entry(page_list->prev, struct page, lru); | |
acead002 | 310 | struct ceph_vino vino; |
7c272194 SW |
311 | struct ceph_osd_request *req; |
312 | u64 off; | |
1d3576fd | 313 | u64 len; |
7c272194 SW |
314 | int i; |
315 | struct page **pages; | |
316 | pgoff_t next_index; | |
317 | int nr_pages = 0; | |
318 | int ret; | |
1d3576fd | 319 | |
6285bc23 | 320 | off = (u64) page_offset(page); |
1d3576fd | 321 | |
7c272194 SW |
322 | /* count pages */ |
323 | next_index = page->index; | |
324 | list_for_each_entry_reverse(page, page_list, lru) { | |
325 | if (page->index != next_index) | |
326 | break; | |
327 | nr_pages++; | |
328 | next_index++; | |
0d66a487 SW |
329 | if (max && nr_pages == max) |
330 | break; | |
7c272194 | 331 | } |
09cbfeaf | 332 | len = nr_pages << PAGE_SHIFT; |
7c272194 SW |
333 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
334 | off, len); | |
acead002 AE |
335 | vino = ceph_vino(inode); |
336 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 337 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 338 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 339 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 340 | false); |
6816282d SW |
341 | if (IS_ERR(req)) |
342 | return PTR_ERR(req); | |
1d3576fd | 343 | |
7c272194 | 344 | /* build page vector */ |
cf7b7e14 | 345 | nr_pages = calc_pages_for(0, len); |
687265e5 | 346 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); |
7c272194 SW |
347 | ret = -ENOMEM; |
348 | if (!pages) | |
349 | goto out; | |
350 | for (i = 0; i < nr_pages; ++i) { | |
351 | page = list_entry(page_list->prev, struct page, lru); | |
352 | BUG_ON(PageLocked(page)); | |
1d3576fd | 353 | list_del(&page->lru); |
99ccbd22 | 354 | |
7c272194 SW |
355 | dout("start_read %p adding %p idx %lu\n", inode, page, |
356 | page->index); | |
357 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
687265e5 | 358 | GFP_KERNEL)) { |
d4d3aa38 | 359 | ceph_fscache_uncache_page(inode, page); |
09cbfeaf | 360 | put_page(page); |
7c272194 | 361 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 362 | inode, page); |
7c272194 | 363 | nr_pages = i; |
1afe4785 YZ |
364 | if (nr_pages > 0) { |
365 | len = nr_pages << PAGE_SHIFT; | |
366 | break; | |
367 | } | |
7c272194 | 368 | goto out_pages; |
1d3576fd | 369 | } |
7c272194 | 370 | pages[i] = page; |
1d3576fd | 371 | } |
406e2c9f | 372 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
373 | req->r_callback = finish_read; |
374 | req->r_inode = inode; | |
375 | ||
376 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); | |
377 | ret = ceph_osdc_start_request(osdc, req, false); | |
378 | if (ret < 0) | |
379 | goto out_pages; | |
380 | ceph_osdc_put_request(req); | |
381 | return nr_pages; | |
382 | ||
383 | out_pages: | |
1afe4785 YZ |
384 | for (i = 0; i < nr_pages; ++i) { |
385 | ceph_fscache_readpage_cancel(inode, pages[i]); | |
386 | unlock_page(pages[i]); | |
387 | } | |
388 | ceph_put_page_vector(pages, nr_pages, false); | |
7c272194 SW |
389 | out: |
390 | ceph_osdc_put_request(req); | |
391 | return ret; | |
392 | } | |
1d3576fd | 393 | |
7c272194 SW |
394 | |
395 | /* | |
396 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
397 | * the caller (VM) cleans them up. | |
398 | */ | |
399 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
400 | struct list_head *page_list, unsigned nr_pages) | |
401 | { | |
496ad9aa | 402 | struct inode *inode = file_inode(file); |
0d66a487 | 403 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
7c272194 | 404 | int rc = 0; |
0d66a487 SW |
405 | int max = 0; |
406 | ||
83701246 YZ |
407 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
408 | return -EINVAL; | |
409 | ||
99ccbd22 MT |
410 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
411 | &nr_pages); | |
412 | ||
413 | if (rc == 0) | |
414 | goto out; | |
415 | ||
09cbfeaf KS |
416 | if (fsc->mount_options->rsize >= PAGE_SIZE) |
417 | max = (fsc->mount_options->rsize + PAGE_SIZE - 1) | |
0d66a487 | 418 | >> PAGE_SHIFT; |
7c272194 | 419 | |
2794a82a AE |
420 | dout("readpages %p file %p nr_pages %d max %d\n", inode, |
421 | file, nr_pages, | |
0d66a487 | 422 | max); |
7c272194 | 423 | while (!list_empty(page_list)) { |
0d66a487 | 424 | rc = start_read(inode, page_list, max); |
7c272194 SW |
425 | if (rc < 0) |
426 | goto out; | |
427 | BUG_ON(rc == 0); | |
428 | } | |
1d3576fd | 429 | out: |
76be778b MT |
430 | ceph_fscache_readpages_cancel(inode, page_list); |
431 | ||
7c272194 | 432 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
433 | return rc; |
434 | } | |
435 | ||
436 | /* | |
437 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
438 | * only snap context we are allowed to write back. | |
1d3576fd | 439 | */ |
6298a337 | 440 | static struct ceph_snap_context *get_oldest_context(struct inode *inode, |
e1966b49 | 441 | loff_t *snap_size) |
1d3576fd SW |
442 | { |
443 | struct ceph_inode_info *ci = ceph_inode(inode); | |
444 | struct ceph_snap_context *snapc = NULL; | |
445 | struct ceph_cap_snap *capsnap = NULL; | |
446 | ||
be655596 | 447 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
448 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
449 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
450 | capsnap->context, capsnap->dirty_pages); | |
451 | if (capsnap->dirty_pages) { | |
452 | snapc = ceph_get_snap_context(capsnap->context); | |
453 | if (snap_size) | |
454 | *snap_size = capsnap->size; | |
455 | break; | |
456 | } | |
457 | } | |
7d8cb26d | 458 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 459 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
460 | dout(" head snapc %p has %d dirty pages\n", |
461 | snapc, ci->i_wrbuffer_ref_head); | |
462 | } | |
be655596 | 463 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
464 | return snapc; |
465 | } | |
466 | ||
467 | /* | |
468 | * Write a single page, but leave the page locked. | |
469 | * | |
470 | * If we get a write error, set the page error bit, but still adjust the | |
471 | * dirty page accounting (i.e., page is no longer dirty). | |
472 | */ | |
473 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
474 | { | |
475 | struct inode *inode; | |
476 | struct ceph_inode_info *ci; | |
3d14c5d2 | 477 | struct ceph_fs_client *fsc; |
1d3576fd | 478 | struct ceph_osd_client *osdc; |
6298a337 | 479 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 480 | loff_t page_off = page_offset(page); |
e1966b49 | 481 | loff_t snap_size = -1; |
2baba250 | 482 | long writeback_stat; |
e1966b49 | 483 | u64 truncate_size; |
fc2744aa | 484 | u32 truncate_seq; |
09cbfeaf | 485 | int err = 0, len = PAGE_SIZE; |
1d3576fd SW |
486 | |
487 | dout("writepage %p idx %lu\n", page, page->index); | |
488 | ||
489 | if (!page->mapping || !page->mapping->host) { | |
490 | dout("writepage %p - no mapping\n", page); | |
491 | return -EFAULT; | |
492 | } | |
493 | inode = page->mapping->host; | |
494 | ci = ceph_inode(inode); | |
3d14c5d2 YS |
495 | fsc = ceph_inode_to_client(inode); |
496 | osdc = &fsc->client->osdc; | |
1d3576fd SW |
497 | |
498 | /* verify this is a writeable snap context */ | |
61600ef8 | 499 | snapc = page_snap_context(page); |
1d3576fd SW |
500 | if (snapc == NULL) { |
501 | dout("writepage %p page %p not dirty?\n", inode, page); | |
502 | goto out; | |
503 | } | |
6298a337 SW |
504 | oldest = get_oldest_context(inode, &snap_size); |
505 | if (snapc->seq > oldest->seq) { | |
1d3576fd | 506 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 507 | inode, page, snapc); |
1d3576fd SW |
508 | /* we should only noop if called by kswapd */ |
509 | WARN_ON((current->flags & PF_MEMALLOC) == 0); | |
6298a337 | 510 | ceph_put_snap_context(oldest); |
1d3576fd SW |
511 | goto out; |
512 | } | |
6298a337 | 513 | ceph_put_snap_context(oldest); |
1d3576fd | 514 | |
fc2744aa YZ |
515 | spin_lock(&ci->i_ceph_lock); |
516 | truncate_seq = ci->i_truncate_seq; | |
517 | truncate_size = ci->i_truncate_size; | |
e1966b49 | 518 | if (snap_size == -1) |
fc2744aa YZ |
519 | snap_size = i_size_read(inode); |
520 | spin_unlock(&ci->i_ceph_lock); | |
521 | ||
1d3576fd | 522 | /* is this a partial page at end of file? */ |
fc2744aa YZ |
523 | if (page_off >= snap_size) { |
524 | dout("%p page eof %llu\n", page, snap_size); | |
525 | goto out; | |
526 | } | |
527 | if (snap_size < page_off + len) | |
528 | len = snap_size - page_off; | |
1d3576fd | 529 | |
ae00d4f3 SW |
530 | dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", |
531 | inode, page, page->index, page_off, len, snapc); | |
1d3576fd | 532 | |
3d14c5d2 | 533 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
2baba250 | 534 | if (writeback_stat > |
3d14c5d2 YS |
535 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
536 | set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); | |
2baba250 | 537 | |
1d3576fd SW |
538 | set_page_writeback(page); |
539 | err = ceph_osdc_writepages(osdc, ceph_vino(inode), | |
540 | &ci->i_layout, snapc, | |
541 | page_off, len, | |
fc2744aa | 542 | truncate_seq, truncate_size, |
24808826 | 543 | &inode->i_mtime, &page, 1); |
1d3576fd | 544 | if (err < 0) { |
ad15ec06 YZ |
545 | struct writeback_control tmp_wbc; |
546 | if (!wbc) | |
547 | wbc = &tmp_wbc; | |
548 | if (err == -ERESTARTSYS) { | |
549 | /* killed by SIGKILL */ | |
550 | dout("writepage interrupted page %p\n", page); | |
551 | redirty_page_for_writepage(wbc, page); | |
552 | end_page_writeback(page); | |
553 | goto out; | |
554 | } | |
555 | dout("writepage setting page/mapping error %d %p\n", | |
556 | err, page); | |
1d3576fd SW |
557 | SetPageError(page); |
558 | mapping_set_error(&inode->i_data, err); | |
ad15ec06 | 559 | wbc->pages_skipped++; |
1d3576fd SW |
560 | } else { |
561 | dout("writepage cleaned page %p\n", page); | |
562 | err = 0; /* vfs expects us to return 0 */ | |
563 | } | |
564 | page->private = 0; | |
565 | ClearPagePrivate(page); | |
566 | end_page_writeback(page); | |
567 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 568 | ceph_put_snap_context(snapc); /* page's reference */ |
1d3576fd SW |
569 | out: |
570 | return err; | |
571 | } | |
572 | ||
573 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
574 | { | |
dbd646a8 YS |
575 | int err; |
576 | struct inode *inode = page->mapping->host; | |
577 | BUG_ON(!inode); | |
70b666c3 | 578 | ihold(inode); |
dbd646a8 | 579 | err = writepage_nounlock(page, wbc); |
ad15ec06 YZ |
580 | if (err == -ERESTARTSYS) { |
581 | /* direct memory reclaimer was killed by SIGKILL. return 0 | |
582 | * to prevent caller from setting mapping/page error */ | |
583 | err = 0; | |
584 | } | |
1d3576fd | 585 | unlock_page(page); |
dbd646a8 | 586 | iput(inode); |
1d3576fd SW |
587 | return err; |
588 | } | |
589 | ||
1d3576fd SW |
590 | /* |
591 | * lame release_pages helper. release_pages() isn't exported to | |
592 | * modules. | |
593 | */ | |
594 | static void ceph_release_pages(struct page **pages, int num) | |
595 | { | |
596 | struct pagevec pvec; | |
597 | int i; | |
598 | ||
599 | pagevec_init(&pvec, 0); | |
600 | for (i = 0; i < num; i++) { | |
601 | if (pagevec_add(&pvec, pages[i]) == 0) | |
602 | pagevec_release(&pvec); | |
603 | } | |
604 | pagevec_release(&pvec); | |
605 | } | |
606 | ||
1d3576fd SW |
607 | /* |
608 | * async writeback completion handler. | |
609 | * | |
610 | * If we get an error, set the mapping error bit, but not the individual | |
611 | * page error bits. | |
612 | */ | |
85e084fe | 613 | static void writepages_finish(struct ceph_osd_request *req) |
1d3576fd SW |
614 | { |
615 | struct inode *inode = req->r_inode; | |
1d3576fd | 616 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 617 | struct ceph_osd_data *osd_data; |
1d3576fd | 618 | struct page *page; |
5b64640c YZ |
619 | int num_pages, total_pages = 0; |
620 | int i, j; | |
621 | int rc = req->r_result; | |
1d3576fd SW |
622 | struct ceph_snap_context *snapc = req->r_snapc; |
623 | struct address_space *mapping = inode->i_mapping; | |
3d14c5d2 | 624 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
5b64640c | 625 | bool remove_page; |
1d3576fd | 626 | |
5b64640c YZ |
627 | dout("writepages_finish %p rc %d\n", inode, rc); |
628 | if (rc < 0) | |
1d3576fd | 629 | mapping_set_error(mapping, rc); |
5b64640c YZ |
630 | |
631 | /* | |
632 | * We lost the cache cap, need to truncate the page before | |
633 | * it is unlocked, otherwise we'd truncate it later in the | |
634 | * page truncation thread, possibly losing some data that | |
635 | * raced its way in | |
636 | */ | |
637 | remove_page = !(ceph_caps_issued(ci) & | |
638 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); | |
1d3576fd SW |
639 | |
640 | /* clean all pages */ | |
5b64640c YZ |
641 | for (i = 0; i < req->r_num_ops; i++) { |
642 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) | |
643 | break; | |
e63dc5c7 | 644 | |
5b64640c YZ |
645 | osd_data = osd_req_op_extent_osd_data(req, i); |
646 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); | |
647 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
648 | (u64)osd_data->length); | |
649 | total_pages += num_pages; | |
650 | for (j = 0; j < num_pages; j++) { | |
651 | page = osd_data->pages[j]; | |
652 | BUG_ON(!page); | |
653 | WARN_ON(!PageUptodate(page)); | |
654 | ||
655 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
656 | CONGESTION_OFF_THRESH( | |
657 | fsc->mount_options->congestion_kb)) | |
658 | clear_bdi_congested(&fsc->backing_dev_info, | |
659 | BLK_RW_ASYNC); | |
660 | ||
b109eec6 YZ |
661 | if (rc < 0) |
662 | SetPageError(page); | |
663 | ||
5b64640c YZ |
664 | ceph_put_snap_context(page_snap_context(page)); |
665 | page->private = 0; | |
666 | ClearPagePrivate(page); | |
667 | dout("unlocking %p\n", page); | |
668 | end_page_writeback(page); | |
669 | ||
670 | if (remove_page) | |
671 | generic_error_remove_page(inode->i_mapping, | |
672 | page); | |
673 | ||
674 | unlock_page(page); | |
675 | } | |
676 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", | |
677 | inode, osd_data->length, rc >= 0 ? num_pages : 0); | |
e63dc5c7 | 678 | |
5b64640c | 679 | ceph_release_pages(osd_data->pages, num_pages); |
1d3576fd | 680 | } |
1d3576fd | 681 | |
5b64640c YZ |
682 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
683 | ||
684 | osd_data = osd_req_op_extent_osd_data(req, 0); | |
87060c10 AE |
685 | if (osd_data->pages_from_pool) |
686 | mempool_free(osd_data->pages, | |
640ef79d | 687 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
1d3576fd | 688 | else |
87060c10 | 689 | kfree(osd_data->pages); |
1d3576fd SW |
690 | ceph_osdc_put_request(req); |
691 | } | |
692 | ||
1d3576fd SW |
693 | /* |
694 | * initiate async writeback | |
695 | */ | |
696 | static int ceph_writepages_start(struct address_space *mapping, | |
697 | struct writeback_control *wbc) | |
698 | { | |
699 | struct inode *inode = mapping->host; | |
1d3576fd | 700 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
701 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
702 | struct ceph_vino vino = ceph_vino(inode); | |
1d3576fd SW |
703 | pgoff_t index, start, end; |
704 | int range_whole = 0; | |
705 | int should_loop = 1; | |
706 | pgoff_t max_pages = 0, max_pages_ever = 0; | |
80e755fe | 707 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd SW |
708 | struct pagevec pvec; |
709 | int done = 0; | |
710 | int rc = 0; | |
711 | unsigned wsize = 1 << inode->i_blkbits; | |
712 | struct ceph_osd_request *req = NULL; | |
021b77be | 713 | int do_sync = 0; |
e1966b49 YZ |
714 | loff_t snap_size, i_size; |
715 | u64 truncate_size; | |
fc2744aa | 716 | u32 truncate_seq; |
1d3576fd SW |
717 | |
718 | /* | |
719 | * Include a 'sync' in the OSD request if this is a data | |
720 | * integrity write (e.g., O_SYNC write or fsync()), or if our | |
721 | * cap is being revoked. | |
722 | */ | |
c62988ec | 723 | if ((wbc->sync_mode == WB_SYNC_ALL) || |
724 | ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) | |
1d3576fd SW |
725 | do_sync = 1; |
726 | dout("writepages_start %p dosync=%d (mode=%s)\n", | |
727 | inode, do_sync, | |
728 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : | |
729 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
730 | ||
48fec5d0 | 731 | if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
732 | if (ci->i_wrbuffer_ref > 0) { |
733 | pr_warn_ratelimited( | |
734 | "writepage_start %p %lld forced umount\n", | |
735 | inode, ceph_ino(inode)); | |
736 | } | |
a341d4df | 737 | mapping_set_error(mapping, -EIO); |
1d3576fd SW |
738 | return -EIO; /* we're in a forced umount, don't write! */ |
739 | } | |
3d14c5d2 YS |
740 | if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) |
741 | wsize = fsc->mount_options->wsize; | |
09cbfeaf KS |
742 | if (wsize < PAGE_SIZE) |
743 | wsize = PAGE_SIZE; | |
744 | max_pages_ever = wsize >> PAGE_SHIFT; | |
1d3576fd SW |
745 | |
746 | pagevec_init(&pvec, 0); | |
747 | ||
1d3576fd SW |
748 | /* where to start/end? */ |
749 | if (wbc->range_cyclic) { | |
750 | start = mapping->writeback_index; /* Start from prev offset */ | |
751 | end = -1; | |
752 | dout(" cyclic, start at %lu\n", start); | |
753 | } else { | |
09cbfeaf KS |
754 | start = wbc->range_start >> PAGE_SHIFT; |
755 | end = wbc->range_end >> PAGE_SHIFT; | |
1d3576fd SW |
756 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
757 | range_whole = 1; | |
758 | should_loop = 0; | |
759 | dout(" not cyclic, %lu to %lu\n", start, end); | |
760 | } | |
761 | index = start; | |
762 | ||
763 | retry: | |
764 | /* find oldest snap context with dirty data */ | |
765 | ceph_put_snap_context(snapc); | |
e1966b49 | 766 | snap_size = -1; |
1d3576fd SW |
767 | snapc = get_oldest_context(inode, &snap_size); |
768 | if (!snapc) { | |
769 | /* hmm, why does writepages get called when there | |
770 | is no dirty data? */ | |
771 | dout(" no snap context with dirty data?\n"); | |
772 | goto out; | |
773 | } | |
774 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", | |
775 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa YZ |
776 | |
777 | spin_lock(&ci->i_ceph_lock); | |
778 | truncate_seq = ci->i_truncate_seq; | |
779 | truncate_size = ci->i_truncate_size; | |
e1966b49 | 780 | i_size = i_size_read(inode); |
fc2744aa YZ |
781 | spin_unlock(&ci->i_ceph_lock); |
782 | ||
1d3576fd SW |
783 | if (last_snapc && snapc != last_snapc) { |
784 | /* if we switched to a newer snapc, restart our scan at the | |
785 | * start of the original file range. */ | |
786 | dout(" snapc differs from last pass, restarting at %lu\n", | |
787 | index); | |
788 | index = start; | |
789 | } | |
790 | last_snapc = snapc; | |
791 | ||
792 | while (!done && index <= end) { | |
793 | unsigned i; | |
794 | int first; | |
5b64640c YZ |
795 | pgoff_t strip_unit_end = 0; |
796 | int num_ops = 0, op_idx; | |
797 | int pvec_pages, locked_pages = 0; | |
798 | struct page **pages = NULL, **data_pages; | |
e5975c7c | 799 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
1d3576fd SW |
800 | struct page *page; |
801 | int want; | |
5b64640c | 802 | u64 offset = 0, len = 0; |
1d3576fd | 803 | |
1d3576fd SW |
804 | max_pages = max_pages_ever; |
805 | ||
806 | get_more_pages: | |
807 | first = -1; | |
808 | want = min(end - index, | |
809 | min((pgoff_t)PAGEVEC_SIZE, | |
810 | max_pages - (pgoff_t)locked_pages) - 1) | |
811 | + 1; | |
812 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
813 | PAGECACHE_TAG_DIRTY, | |
814 | want); | |
815 | dout("pagevec_lookup_tag got %d\n", pvec_pages); | |
816 | if (!pvec_pages && !locked_pages) | |
817 | break; | |
818 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
819 | page = pvec.pages[i]; | |
820 | dout("? %p idx %lu\n", page, page->index); | |
821 | if (locked_pages == 0) | |
822 | lock_page(page); /* first page */ | |
823 | else if (!trylock_page(page)) | |
824 | break; | |
825 | ||
826 | /* only dirty pages, or our accounting breaks */ | |
827 | if (unlikely(!PageDirty(page)) || | |
828 | unlikely(page->mapping != mapping)) { | |
829 | dout("!dirty or !mapping %p\n", page); | |
830 | unlock_page(page); | |
831 | break; | |
832 | } | |
833 | if (!wbc->range_cyclic && page->index > end) { | |
834 | dout("end of range %p\n", page); | |
835 | done = 1; | |
836 | unlock_page(page); | |
837 | break; | |
838 | } | |
5b64640c YZ |
839 | if (strip_unit_end && (page->index > strip_unit_end)) { |
840 | dout("end of strip unit %p\n", page); | |
1d3576fd SW |
841 | unlock_page(page); |
842 | break; | |
843 | } | |
844 | if (wbc->sync_mode != WB_SYNC_NONE) { | |
845 | dout("waiting on writeback %p\n", page); | |
846 | wait_on_page_writeback(page); | |
847 | } | |
e1966b49 YZ |
848 | if (page_offset(page) >= |
849 | (snap_size == -1 ? i_size : snap_size)) { | |
850 | dout("%p page eof %llu\n", page, | |
851 | (snap_size == -1 ? i_size : snap_size)); | |
1d3576fd SW |
852 | done = 1; |
853 | unlock_page(page); | |
854 | break; | |
855 | } | |
856 | if (PageWriteback(page)) { | |
857 | dout("%p under writeback\n", page); | |
858 | unlock_page(page); | |
859 | break; | |
860 | } | |
861 | ||
862 | /* only if matching snap context */ | |
61600ef8 | 863 | pgsnapc = page_snap_context(page); |
80e755fe SW |
864 | if (pgsnapc->seq > snapc->seq) { |
865 | dout("page snapc %p %lld > oldest %p %lld\n", | |
866 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); | |
1d3576fd SW |
867 | unlock_page(page); |
868 | if (!locked_pages) | |
869 | continue; /* keep looking for snap */ | |
870 | break; | |
871 | } | |
872 | ||
873 | if (!clear_page_dirty_for_io(page)) { | |
874 | dout("%p !clear_page_dirty_for_io\n", page); | |
875 | unlock_page(page); | |
876 | break; | |
877 | } | |
878 | ||
e5975c7c AE |
879 | /* |
880 | * We have something to write. If this is | |
881 | * the first locked page this time through, | |
5b64640c YZ |
882 | * calculate max possinle write size and |
883 | * allocate a page array | |
e5975c7c | 884 | */ |
1d3576fd | 885 | if (locked_pages == 0) { |
5b64640c YZ |
886 | u64 objnum; |
887 | u64 objoff; | |
888 | ||
1d3576fd | 889 | /* prepare async write request */ |
e5975c7c | 890 | offset = (u64)page_offset(page); |
1d3576fd | 891 | len = wsize; |
5b64640c YZ |
892 | |
893 | rc = ceph_calc_file_object_mapping(&ci->i_layout, | |
894 | offset, len, | |
895 | &objnum, &objoff, | |
896 | &len); | |
897 | if (rc < 0) { | |
8c71897b HC |
898 | unlock_page(page); |
899 | break; | |
900 | } | |
901 | ||
5b64640c YZ |
902 | num_ops = 1 + do_sync; |
903 | strip_unit_end = page->index + | |
09cbfeaf | 904 | ((len - 1) >> PAGE_SHIFT); |
88486957 | 905 | |
5b64640c | 906 | BUG_ON(pages); |
88486957 | 907 | max_pages = calc_pages_for(0, (u64)len); |
fc2744aa YZ |
908 | pages = kmalloc(max_pages * sizeof (*pages), |
909 | GFP_NOFS); | |
88486957 AE |
910 | if (!pages) { |
911 | pool = fsc->wb_pagevec_pool; | |
88486957 | 912 | pages = mempool_alloc(pool, GFP_NOFS); |
e5975c7c | 913 | BUG_ON(!pages); |
88486957 | 914 | } |
5b64640c YZ |
915 | |
916 | len = 0; | |
917 | } else if (page->index != | |
09cbfeaf | 918 | (offset + len) >> PAGE_SHIFT) { |
5b64640c YZ |
919 | if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : |
920 | CEPH_OSD_MAX_OPS)) { | |
921 | redirty_page_for_writepage(wbc, page); | |
922 | unlock_page(page); | |
923 | break; | |
924 | } | |
925 | ||
926 | num_ops++; | |
927 | offset = (u64)page_offset(page); | |
928 | len = 0; | |
1d3576fd SW |
929 | } |
930 | ||
931 | /* note position of first page in pvec */ | |
932 | if (first < 0) | |
933 | first = i; | |
934 | dout("%p will write page %p idx %lu\n", | |
935 | inode, page, page->index); | |
2baba250 | 936 | |
5b64640c YZ |
937 | if (atomic_long_inc_return(&fsc->writeback_count) > |
938 | CONGESTION_ON_THRESH( | |
3d14c5d2 YS |
939 | fsc->mount_options->congestion_kb)) { |
940 | set_bdi_congested(&fsc->backing_dev_info, | |
213c99ee | 941 | BLK_RW_ASYNC); |
2baba250 YS |
942 | } |
943 | ||
e5975c7c | 944 | pages[locked_pages] = page; |
1d3576fd | 945 | locked_pages++; |
09cbfeaf | 946 | len += PAGE_SIZE; |
1d3576fd SW |
947 | } |
948 | ||
949 | /* did we get anything? */ | |
950 | if (!locked_pages) | |
951 | goto release_pvec_pages; | |
952 | if (i) { | |
953 | int j; | |
954 | BUG_ON(!locked_pages || first < 0); | |
955 | ||
956 | if (pvec_pages && i == pvec_pages && | |
957 | locked_pages < max_pages) { | |
958 | dout("reached end pvec, trying for more\n"); | |
959 | pagevec_reinit(&pvec); | |
960 | goto get_more_pages; | |
961 | } | |
962 | ||
963 | /* shift unused pages over in the pvec... we | |
964 | * will need to release them below. */ | |
965 | for (j = i; j < pvec_pages; j++) { | |
5b64640c | 966 | dout(" pvec leftover page %p\n", pvec.pages[j]); |
1d3576fd SW |
967 | pvec.pages[j-i+first] = pvec.pages[j]; |
968 | } | |
969 | pvec.nr -= i-first; | |
970 | } | |
971 | ||
5b64640c | 972 | new_request: |
e5975c7c | 973 | offset = page_offset(pages[0]); |
5b64640c YZ |
974 | len = wsize; |
975 | ||
976 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
977 | &ci->i_layout, vino, | |
978 | offset, &len, 0, num_ops, | |
979 | CEPH_OSD_OP_WRITE, | |
980 | CEPH_OSD_FLAG_WRITE | | |
981 | CEPH_OSD_FLAG_ONDISK, | |
982 | snapc, truncate_seq, | |
983 | truncate_size, false); | |
984 | if (IS_ERR(req)) { | |
985 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
986 | &ci->i_layout, vino, | |
987 | offset, &len, 0, | |
988 | min(num_ops, | |
989 | CEPH_OSD_SLAB_OPS), | |
990 | CEPH_OSD_OP_WRITE, | |
991 | CEPH_OSD_FLAG_WRITE | | |
992 | CEPH_OSD_FLAG_ONDISK, | |
993 | snapc, truncate_seq, | |
994 | truncate_size, true); | |
995 | BUG_ON(IS_ERR(req)); | |
e1966b49 | 996 | } |
5b64640c | 997 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
09cbfeaf | 998 | PAGE_SIZE - offset); |
5b64640c YZ |
999 | |
1000 | req->r_callback = writepages_finish; | |
1001 | req->r_inode = inode; | |
1d3576fd | 1002 | |
5b64640c YZ |
1003 | /* Format the osd request message and submit the write */ |
1004 | len = 0; | |
1005 | data_pages = pages; | |
1006 | op_idx = 0; | |
1007 | for (i = 0; i < locked_pages; i++) { | |
1008 | u64 cur_offset = page_offset(pages[i]); | |
1009 | if (offset + len != cur_offset) { | |
1010 | if (op_idx + do_sync + 1 == req->r_num_ops) | |
1011 | break; | |
1012 | osd_req_op_extent_dup_last(req, op_idx, | |
1013 | cur_offset - offset); | |
1014 | dout("writepages got pages at %llu~%llu\n", | |
1015 | offset, len); | |
1016 | osd_req_op_extent_osd_data_pages(req, op_idx, | |
1017 | data_pages, len, 0, | |
a4ce40a9 | 1018 | !!pool, false); |
5b64640c | 1019 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1020 | |
5b64640c YZ |
1021 | len = 0; |
1022 | offset = cur_offset; | |
1023 | data_pages = pages + i; | |
1024 | op_idx++; | |
1025 | } | |
1026 | ||
1027 | set_page_writeback(pages[i]); | |
09cbfeaf | 1028 | len += PAGE_SIZE; |
5b64640c YZ |
1029 | } |
1030 | ||
1031 | if (snap_size != -1) { | |
1032 | len = min(len, snap_size - offset); | |
1033 | } else if (i == locked_pages) { | |
1034 | /* writepages_finish() clears writeback pages | |
1035 | * according to the data length, so make sure | |
1036 | * data length covers all locked pages */ | |
09cbfeaf | 1037 | u64 min_len = len + 1 - PAGE_SIZE; |
5b64640c YZ |
1038 | len = min(len, (u64)i_size_read(inode) - offset); |
1039 | len = max(len, min_len); | |
1040 | } | |
1041 | dout("writepages got pages at %llu~%llu\n", offset, len); | |
e5975c7c | 1042 | |
5b64640c YZ |
1043 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
1044 | 0, !!pool, false); | |
1045 | osd_req_op_extent_update(req, op_idx, len); | |
e5975c7c | 1046 | |
5b64640c YZ |
1047 | if (do_sync) { |
1048 | op_idx++; | |
1049 | osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); | |
1050 | } | |
1051 | BUG_ON(op_idx + 1 != req->r_num_ops); | |
1052 | ||
1053 | pool = NULL; | |
1054 | if (i < locked_pages) { | |
1055 | BUG_ON(num_ops <= req->r_num_ops); | |
1056 | num_ops -= req->r_num_ops; | |
1057 | num_ops += do_sync; | |
1058 | locked_pages -= i; | |
1059 | ||
1060 | /* allocate new pages array for next request */ | |
1061 | data_pages = pages; | |
1062 | pages = kmalloc(locked_pages * sizeof (*pages), | |
1063 | GFP_NOFS); | |
1064 | if (!pages) { | |
1065 | pool = fsc->wb_pagevec_pool; | |
1066 | pages = mempool_alloc(pool, GFP_NOFS); | |
1067 | BUG_ON(!pages); | |
1068 | } | |
1069 | memcpy(pages, data_pages + i, | |
1070 | locked_pages * sizeof(*pages)); | |
1071 | memset(data_pages + i, 0, | |
1072 | locked_pages * sizeof(*pages)); | |
1073 | } else { | |
1074 | BUG_ON(num_ops != req->r_num_ops); | |
1075 | index = pages[i - 1]->index + 1; | |
1076 | /* request message now owns the pages array */ | |
1077 | pages = NULL; | |
1078 | } | |
e5975c7c | 1079 | |
bb873b53 | 1080 | req->r_mtime = inode->i_mtime; |
9d6fcb08 SW |
1081 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
1082 | BUG_ON(rc); | |
1d3576fd SW |
1083 | req = NULL; |
1084 | ||
5b64640c YZ |
1085 | wbc->nr_to_write -= i; |
1086 | if (pages) | |
1087 | goto new_request; | |
1088 | ||
1d3576fd SW |
1089 | if (wbc->nr_to_write <= 0) |
1090 | done = 1; | |
1091 | ||
1092 | release_pvec_pages: | |
1093 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
1094 | pvec.nr ? pvec.pages[0] : NULL); | |
1095 | pagevec_release(&pvec); | |
1096 | ||
1097 | if (locked_pages && !done) | |
1098 | goto retry; | |
1099 | } | |
1100 | ||
1101 | if (should_loop && !done) { | |
1102 | /* more to do; loop back to beginning of file */ | |
1103 | dout("writepages looping back to beginning of file\n"); | |
1104 | should_loop = 0; | |
1105 | index = 0; | |
1106 | goto retry; | |
1107 | } | |
1108 | ||
1109 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1110 | mapping->writeback_index = index; | |
1111 | ||
1112 | out: | |
3ed97d63 | 1113 | ceph_osdc_put_request(req); |
1d3576fd SW |
1114 | ceph_put_snap_context(snapc); |
1115 | dout("writepages done, rc = %d\n", rc); | |
1d3576fd SW |
1116 | return rc; |
1117 | } | |
1118 | ||
1119 | ||
1120 | ||
1121 | /* | |
1122 | * See if a given @snapc is either writeable, or already written. | |
1123 | */ | |
1124 | static int context_is_writeable_or_written(struct inode *inode, | |
1125 | struct ceph_snap_context *snapc) | |
1126 | { | |
1127 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); | |
6298a337 SW |
1128 | int ret = !oldest || snapc->seq <= oldest->seq; |
1129 | ||
1130 | ceph_put_snap_context(oldest); | |
1131 | return ret; | |
1d3576fd SW |
1132 | } |
1133 | ||
1134 | /* | |
1135 | * We are only allowed to write into/dirty the page if the page is | |
1136 | * clean, or already dirty within the same snap context. | |
8f883c24 SW |
1137 | * |
1138 | * called with page locked. | |
1139 | * return success with page locked, | |
1140 | * or any failure (incl -EAGAIN) with page unlocked. | |
1d3576fd | 1141 | */ |
4af6b225 YS |
1142 | static int ceph_update_writeable_page(struct file *file, |
1143 | loff_t pos, unsigned len, | |
1144 | struct page *page) | |
1d3576fd | 1145 | { |
496ad9aa | 1146 | struct inode *inode = file_inode(file); |
6c93df5d | 1147 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 1148 | struct ceph_inode_info *ci = ceph_inode(inode); |
09cbfeaf KS |
1149 | loff_t page_off = pos & PAGE_MASK; |
1150 | int pos_in_page = pos & ~PAGE_MASK; | |
1d3576fd SW |
1151 | int end_in_page = pos_in_page + len; |
1152 | loff_t i_size; | |
1d3576fd | 1153 | int r; |
80e755fe | 1154 | struct ceph_snap_context *snapc, *oldest; |
1d3576fd | 1155 | |
6c93df5d YZ |
1156 | if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
1157 | dout(" page %p forced umount\n", page); | |
1158 | unlock_page(page); | |
1159 | return -EIO; | |
1160 | } | |
1161 | ||
1d3576fd SW |
1162 | retry_locked: |
1163 | /* writepages currently holds page lock, but if we change that later, */ | |
1164 | wait_on_page_writeback(page); | |
1165 | ||
61600ef8 | 1166 | snapc = page_snap_context(page); |
80e755fe | 1167 | if (snapc && snapc != ci->i_head_snapc) { |
1d3576fd SW |
1168 | /* |
1169 | * this page is already dirty in another (older) snap | |
1170 | * context! is it writeable now? | |
1171 | */ | |
80e755fe | 1172 | oldest = get_oldest_context(inode, NULL); |
1d3576fd | 1173 | |
80e755fe | 1174 | if (snapc->seq > oldest->seq) { |
6298a337 | 1175 | ceph_put_snap_context(oldest); |
1d3576fd | 1176 | dout(" page %p snapc %p not current or oldest\n", |
6298a337 | 1177 | page, snapc); |
1d3576fd SW |
1178 | /* |
1179 | * queue for writeback, and wait for snapc to | |
1180 | * be writeable or written | |
1181 | */ | |
6298a337 | 1182 | snapc = ceph_get_snap_context(snapc); |
1d3576fd | 1183 | unlock_page(page); |
3c6f6b79 | 1184 | ceph_queue_writeback(inode); |
a78bbd4b | 1185 | r = wait_event_killable(ci->i_cap_wq, |
1d3576fd SW |
1186 | context_is_writeable_or_written(inode, snapc)); |
1187 | ceph_put_snap_context(snapc); | |
8f883c24 SW |
1188 | if (r == -ERESTARTSYS) |
1189 | return r; | |
4af6b225 | 1190 | return -EAGAIN; |
1d3576fd | 1191 | } |
6298a337 | 1192 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1193 | |
1194 | /* yay, writeable, do it now (without dropping page lock) */ | |
1195 | dout(" page %p snapc %p not current, but oldest\n", | |
1196 | page, snapc); | |
1197 | if (!clear_page_dirty_for_io(page)) | |
1198 | goto retry_locked; | |
1199 | r = writepage_nounlock(page, NULL); | |
1200 | if (r < 0) | |
1201 | goto fail_nosnap; | |
1202 | goto retry_locked; | |
1203 | } | |
1204 | ||
1205 | if (PageUptodate(page)) { | |
1206 | dout(" page %p already uptodate\n", page); | |
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | /* full page? */ | |
09cbfeaf | 1211 | if (pos_in_page == 0 && len == PAGE_SIZE) |
1d3576fd SW |
1212 | return 0; |
1213 | ||
1214 | /* past end of file? */ | |
99c88e69 | 1215 | i_size = i_size_read(inode); |
1d3576fd | 1216 | |
1d3576fd SW |
1217 | if (page_off >= i_size || |
1218 | (pos_in_page == 0 && (pos+len) >= i_size && | |
09cbfeaf | 1219 | end_in_page - pos_in_page != PAGE_SIZE)) { |
1d3576fd | 1220 | dout(" zeroing %p 0 - %d and %d - %d\n", |
09cbfeaf | 1221 | page, pos_in_page, end_in_page, (int)PAGE_SIZE); |
1d3576fd SW |
1222 | zero_user_segments(page, |
1223 | 0, pos_in_page, | |
09cbfeaf | 1224 | end_in_page, PAGE_SIZE); |
1d3576fd SW |
1225 | return 0; |
1226 | } | |
1227 | ||
1228 | /* we need to read it. */ | |
1d3576fd SW |
1229 | r = readpage_nounlock(file, page); |
1230 | if (r < 0) | |
1231 | goto fail_nosnap; | |
1232 | goto retry_locked; | |
1d3576fd SW |
1233 | fail_nosnap: |
1234 | unlock_page(page); | |
1235 | return r; | |
1236 | } | |
1237 | ||
4af6b225 YS |
1238 | /* |
1239 | * We are only allowed to write into/dirty the page if the page is | |
1240 | * clean, or already dirty within the same snap context. | |
1241 | */ | |
1242 | static int ceph_write_begin(struct file *file, struct address_space *mapping, | |
1243 | loff_t pos, unsigned len, unsigned flags, | |
1244 | struct page **pagep, void **fsdata) | |
1245 | { | |
496ad9aa | 1246 | struct inode *inode = file_inode(file); |
4af6b225 | 1247 | struct page *page; |
09cbfeaf | 1248 | pgoff_t index = pos >> PAGE_SHIFT; |
7971bd92 | 1249 | int r; |
4af6b225 YS |
1250 | |
1251 | do { | |
8f883c24 | 1252 | /* get a page */ |
4af6b225 | 1253 | page = grab_cache_page_write_begin(mapping, index, 0); |
7971bd92 SW |
1254 | if (!page) |
1255 | return -ENOMEM; | |
4af6b225 YS |
1256 | |
1257 | dout("write_begin file %p inode %p page %p %d~%d\n", file, | |
213c99ee | 1258 | inode, page, (int)pos, (int)len); |
4af6b225 YS |
1259 | |
1260 | r = ceph_update_writeable_page(file, pos, len, page); | |
c1d00b2d | 1261 | if (r < 0) |
09cbfeaf | 1262 | put_page(page); |
c1d00b2d TK |
1263 | else |
1264 | *pagep = page; | |
4af6b225 YS |
1265 | } while (r == -EAGAIN); |
1266 | ||
1267 | return r; | |
1268 | } | |
1269 | ||
1d3576fd SW |
1270 | /* |
1271 | * we don't do anything in here that simple_write_end doesn't do | |
5dda377c | 1272 | * except adjust dirty page accounting |
1d3576fd SW |
1273 | */ |
1274 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1275 | loff_t pos, unsigned len, unsigned copied, | |
1276 | struct page *page, void *fsdata) | |
1277 | { | |
496ad9aa | 1278 | struct inode *inode = file_inode(file); |
09cbfeaf | 1279 | unsigned from = pos & (PAGE_SIZE - 1); |
1d3576fd SW |
1280 | int check_cap = 0; |
1281 | ||
1282 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1283 | inode, page, (int)pos, (int)copied, (int)len); | |
1284 | ||
1285 | /* zero the stale part of the page if we did a short copy */ | |
1286 | if (copied < len) | |
1287 | zero_user_segment(page, from+copied, len); | |
1288 | ||
1289 | /* did file size increase? */ | |
99c88e69 | 1290 | if (pos+copied > i_size_read(inode)) |
1d3576fd SW |
1291 | check_cap = ceph_inode_set_size(inode, pos+copied); |
1292 | ||
1293 | if (!PageUptodate(page)) | |
1294 | SetPageUptodate(page); | |
1295 | ||
1296 | set_page_dirty(page); | |
1297 | ||
1298 | unlock_page(page); | |
09cbfeaf | 1299 | put_page(page); |
1d3576fd SW |
1300 | |
1301 | if (check_cap) | |
1302 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1303 | ||
1304 | return copied; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * we set .direct_IO to indicate direct io is supported, but since we | |
1309 | * intercept O_DIRECT reads and writes early, this function should | |
1310 | * never get called. | |
1311 | */ | |
c8b8e32d | 1312 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
1d3576fd SW |
1313 | { |
1314 | WARN_ON(1); | |
1315 | return -EINVAL; | |
1316 | } | |
1317 | ||
1318 | const struct address_space_operations ceph_aops = { | |
1319 | .readpage = ceph_readpage, | |
1320 | .readpages = ceph_readpages, | |
1321 | .writepage = ceph_writepage, | |
1322 | .writepages = ceph_writepages_start, | |
1323 | .write_begin = ceph_write_begin, | |
1324 | .write_end = ceph_write_end, | |
1325 | .set_page_dirty = ceph_set_page_dirty, | |
1326 | .invalidatepage = ceph_invalidatepage, | |
1327 | .releasepage = ceph_releasepage, | |
1328 | .direct_IO = ceph_direct_io, | |
1329 | }; | |
1330 | ||
4f7e89f6 YZ |
1331 | static void ceph_block_sigs(sigset_t *oldset) |
1332 | { | |
1333 | sigset_t mask; | |
1334 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
1335 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
1336 | } | |
1337 | ||
1338 | static void ceph_restore_sigs(sigset_t *oldset) | |
1339 | { | |
1340 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
1341 | } | |
1d3576fd SW |
1342 | |
1343 | /* | |
1344 | * vm ops | |
1345 | */ | |
61f68816 YZ |
1346 | static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1347 | { | |
1348 | struct inode *inode = file_inode(vma->vm_file); | |
1349 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1350 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1351 | struct page *pinned_page = NULL; |
09cbfeaf | 1352 | loff_t off = vmf->pgoff << PAGE_SHIFT; |
61f68816 | 1353 | int want, got, ret; |
4f7e89f6 YZ |
1354 | sigset_t oldset; |
1355 | ||
1356 | ceph_block_sigs(&oldset); | |
61f68816 YZ |
1357 | |
1358 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
09cbfeaf | 1359 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
61f68816 YZ |
1360 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1361 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1362 | else | |
1363 | want = CEPH_CAP_FILE_CACHE; | |
4f7e89f6 YZ |
1364 | |
1365 | got = 0; | |
1366 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); | |
6ce026e4 | 1367 | if (ret < 0) |
4f7e89f6 | 1368 | goto out_restore; |
6ce026e4 | 1369 | |
61f68816 | 1370 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
09cbfeaf | 1371 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
61f68816 | 1372 | |
83701246 YZ |
1373 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
1374 | ci->i_inline_version == CEPH_INLINE_NONE) | |
1375 | ret = filemap_fault(vma, vmf); | |
1376 | else | |
1377 | ret = -EAGAIN; | |
61f68816 YZ |
1378 | |
1379 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", | |
09cbfeaf | 1380 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); |
3738daa6 | 1381 | if (pinned_page) |
09cbfeaf | 1382 | put_page(pinned_page); |
61f68816 YZ |
1383 | ceph_put_cap_refs(ci, got); |
1384 | ||
83701246 | 1385 | if (ret != -EAGAIN) |
4f7e89f6 | 1386 | goto out_restore; |
83701246 YZ |
1387 | |
1388 | /* read inline data */ | |
09cbfeaf | 1389 | if (off >= PAGE_SIZE) { |
83701246 YZ |
1390 | /* does not support inline data > PAGE_SIZE */ |
1391 | ret = VM_FAULT_SIGBUS; | |
1392 | } else { | |
1393 | int ret1; | |
1394 | struct address_space *mapping = inode->i_mapping; | |
1395 | struct page *page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1396 | mapping_gfp_constraint(mapping, |
1397 | ~__GFP_FS)); | |
83701246 YZ |
1398 | if (!page) { |
1399 | ret = VM_FAULT_OOM; | |
4f7e89f6 | 1400 | goto out_inline; |
83701246 YZ |
1401 | } |
1402 | ret1 = __ceph_do_getattr(inode, page, | |
1403 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1404 | if (ret1 < 0 || off >= i_size_read(inode)) { | |
1405 | unlock_page(page); | |
09cbfeaf | 1406 | put_page(page); |
6ce026e4 YZ |
1407 | if (ret1 < 0) |
1408 | ret = ret1; | |
1409 | else | |
1410 | ret = VM_FAULT_SIGBUS; | |
4f7e89f6 | 1411 | goto out_inline; |
83701246 | 1412 | } |
09cbfeaf KS |
1413 | if (ret1 < PAGE_SIZE) |
1414 | zero_user_segment(page, ret1, PAGE_SIZE); | |
83701246 YZ |
1415 | else |
1416 | flush_dcache_page(page); | |
1417 | SetPageUptodate(page); | |
1418 | vmf->page = page; | |
1419 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
4f7e89f6 YZ |
1420 | out_inline: |
1421 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", | |
1422 | inode, off, (size_t)PAGE_SIZE, ret); | |
83701246 | 1423 | } |
4f7e89f6 YZ |
1424 | out_restore: |
1425 | ceph_restore_sigs(&oldset); | |
6ce026e4 YZ |
1426 | if (ret < 0) |
1427 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1428 | ||
61f68816 YZ |
1429 | return ret; |
1430 | } | |
1d3576fd SW |
1431 | |
1432 | /* | |
1433 | * Reuse write_begin here for simplicity. | |
1434 | */ | |
1435 | static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1436 | { | |
496ad9aa | 1437 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1438 | struct ceph_inode_info *ci = ceph_inode(inode); |
1439 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
f66fd9f0 | 1440 | struct ceph_cap_flush *prealloc_cf; |
61f68816 | 1441 | struct page *page = vmf->page; |
6285bc23 | 1442 | loff_t off = page_offset(page); |
61f68816 YZ |
1443 | loff_t size = i_size_read(inode); |
1444 | size_t len; | |
1445 | int want, got, ret; | |
4f7e89f6 | 1446 | sigset_t oldset; |
3ca9c3bd | 1447 | |
f66fd9f0 YZ |
1448 | prealloc_cf = ceph_alloc_cap_flush(); |
1449 | if (!prealloc_cf) | |
6ce026e4 | 1450 | return VM_FAULT_OOM; |
f66fd9f0 | 1451 | |
4f7e89f6 | 1452 | ceph_block_sigs(&oldset); |
f66fd9f0 | 1453 | |
28127bdd YZ |
1454 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1455 | struct page *locked_page = NULL; | |
1456 | if (off == 0) { | |
1457 | lock_page(page); | |
1458 | locked_page = page; | |
1459 | } | |
1460 | ret = ceph_uninline_data(vma->vm_file, locked_page); | |
1461 | if (locked_page) | |
1462 | unlock_page(locked_page); | |
6ce026e4 | 1463 | if (ret < 0) |
f66fd9f0 | 1464 | goto out_free; |
28127bdd YZ |
1465 | } |
1466 | ||
09cbfeaf KS |
1467 | if (off + PAGE_SIZE <= size) |
1468 | len = PAGE_SIZE; | |
1d3576fd | 1469 | else |
09cbfeaf | 1470 | len = size & ~PAGE_MASK; |
1d3576fd | 1471 | |
61f68816 YZ |
1472 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1473 | inode, ceph_vinop(inode), off, len, size); | |
1474 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1475 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1476 | else | |
1477 | want = CEPH_CAP_FILE_BUFFER; | |
4f7e89f6 YZ |
1478 | |
1479 | got = 0; | |
1480 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, | |
1481 | &got, NULL); | |
6ce026e4 | 1482 | if (ret < 0) |
4f7e89f6 | 1483 | goto out_free; |
6ce026e4 | 1484 | |
61f68816 YZ |
1485 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
1486 | inode, off, len, ceph_cap_string(got)); | |
1487 | ||
1488 | /* Update time before taking page lock */ | |
1489 | file_update_time(vma->vm_file); | |
4af6b225 | 1490 | |
f0b33df5 YZ |
1491 | do { |
1492 | lock_page(page); | |
4af6b225 | 1493 | |
f0b33df5 YZ |
1494 | if ((off > size) || (page->mapping != inode->i_mapping)) { |
1495 | unlock_page(page); | |
1496 | ret = VM_FAULT_NOPAGE; | |
1497 | break; | |
1498 | } | |
1499 | ||
1500 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); | |
1501 | if (ret >= 0) { | |
1502 | /* success. we'll keep the page locked. */ | |
1503 | set_page_dirty(page); | |
1504 | ret = VM_FAULT_LOCKED; | |
1505 | } | |
1506 | } while (ret == -EAGAIN); | |
4af6b225 | 1507 | |
28127bdd YZ |
1508 | if (ret == VM_FAULT_LOCKED || |
1509 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1510 | int dirty; |
1511 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1512 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1513 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1514 | &prealloc_cf); | |
61f68816 YZ |
1515 | spin_unlock(&ci->i_ceph_lock); |
1516 | if (dirty) | |
1517 | __mark_inode_dirty(inode, dirty); | |
1518 | } | |
1519 | ||
1520 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", | |
1521 | inode, off, len, ceph_cap_string(got), ret); | |
1522 | ceph_put_cap_refs(ci, got); | |
f66fd9f0 | 1523 | out_free: |
4f7e89f6 | 1524 | ceph_restore_sigs(&oldset); |
f66fd9f0 | 1525 | ceph_free_cap_flush(prealloc_cf); |
6ce026e4 YZ |
1526 | if (ret < 0) |
1527 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
1d3576fd SW |
1528 | return ret; |
1529 | } | |
1530 | ||
31c542a1 YZ |
1531 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1532 | char *data, size_t len) | |
1533 | { | |
1534 | struct address_space *mapping = inode->i_mapping; | |
1535 | struct page *page; | |
1536 | ||
1537 | if (locked_page) { | |
1538 | page = locked_page; | |
1539 | } else { | |
1540 | if (i_size_read(inode) == 0) | |
1541 | return; | |
1542 | page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1543 | mapping_gfp_constraint(mapping, |
1544 | ~__GFP_FS)); | |
31c542a1 YZ |
1545 | if (!page) |
1546 | return; | |
1547 | if (PageUptodate(page)) { | |
1548 | unlock_page(page); | |
09cbfeaf | 1549 | put_page(page); |
31c542a1 YZ |
1550 | return; |
1551 | } | |
1552 | } | |
1553 | ||
0668ff52 | 1554 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1555 | inode, ceph_vinop(inode), len, locked_page); |
1556 | ||
1557 | if (len > 0) { | |
1558 | void *kaddr = kmap_atomic(page); | |
1559 | memcpy(kaddr, data, len); | |
1560 | kunmap_atomic(kaddr); | |
1561 | } | |
1562 | ||
1563 | if (page != locked_page) { | |
09cbfeaf KS |
1564 | if (len < PAGE_SIZE) |
1565 | zero_user_segment(page, len, PAGE_SIZE); | |
31c542a1 YZ |
1566 | else |
1567 | flush_dcache_page(page); | |
1568 | ||
1569 | SetPageUptodate(page); | |
1570 | unlock_page(page); | |
09cbfeaf | 1571 | put_page(page); |
31c542a1 YZ |
1572 | } |
1573 | } | |
1574 | ||
28127bdd YZ |
1575 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1576 | { | |
1577 | struct inode *inode = file_inode(filp); | |
1578 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1579 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1580 | struct ceph_osd_request *req; | |
1581 | struct page *page = NULL; | |
1582 | u64 len, inline_version; | |
1583 | int err = 0; | |
1584 | bool from_pagecache = false; | |
1585 | ||
1586 | spin_lock(&ci->i_ceph_lock); | |
1587 | inline_version = ci->i_inline_version; | |
1588 | spin_unlock(&ci->i_ceph_lock); | |
1589 | ||
1590 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1591 | inode, ceph_vinop(inode), inline_version); | |
1592 | ||
1593 | if (inline_version == 1 || /* initial version, no data */ | |
1594 | inline_version == CEPH_INLINE_NONE) | |
1595 | goto out; | |
1596 | ||
1597 | if (locked_page) { | |
1598 | page = locked_page; | |
1599 | WARN_ON(!PageUptodate(page)); | |
1600 | } else if (ceph_caps_issued(ci) & | |
1601 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1602 | page = find_get_page(inode->i_mapping, 0); | |
1603 | if (page) { | |
1604 | if (PageUptodate(page)) { | |
1605 | from_pagecache = true; | |
1606 | lock_page(page); | |
1607 | } else { | |
09cbfeaf | 1608 | put_page(page); |
28127bdd YZ |
1609 | page = NULL; |
1610 | } | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | if (page) { | |
1615 | len = i_size_read(inode); | |
09cbfeaf KS |
1616 | if (len > PAGE_SIZE) |
1617 | len = PAGE_SIZE; | |
28127bdd YZ |
1618 | } else { |
1619 | page = __page_cache_alloc(GFP_NOFS); | |
1620 | if (!page) { | |
1621 | err = -ENOMEM; | |
1622 | goto out; | |
1623 | } | |
1624 | err = __ceph_do_getattr(inode, page, | |
1625 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1626 | if (err < 0) { | |
1627 | /* no inline data */ | |
1628 | if (err == -ENODATA) | |
1629 | err = 0; | |
1630 | goto out; | |
1631 | } | |
1632 | len = err; | |
1633 | } | |
1634 | ||
1635 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1636 | ceph_vino(inode), 0, &len, 0, 1, | |
1637 | CEPH_OSD_OP_CREATE, | |
1638 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, | |
34b759b4 | 1639 | NULL, 0, 0, false); |
28127bdd YZ |
1640 | if (IS_ERR(req)) { |
1641 | err = PTR_ERR(req); | |
1642 | goto out; | |
1643 | } | |
1644 | ||
bb873b53 | 1645 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1646 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1647 | if (!err) | |
1648 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1649 | ceph_osdc_put_request(req); | |
1650 | if (err < 0) | |
1651 | goto out; | |
1652 | ||
1653 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1654 | ceph_vino(inode), 0, &len, 1, 3, | |
1655 | CEPH_OSD_OP_WRITE, | |
1656 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, | |
34b759b4 ID |
1657 | NULL, ci->i_truncate_seq, |
1658 | ci->i_truncate_size, false); | |
28127bdd YZ |
1659 | if (IS_ERR(req)) { |
1660 | err = PTR_ERR(req); | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1665 | ||
ec137c10 YZ |
1666 | { |
1667 | __le64 xattr_buf = cpu_to_le64(inline_version); | |
1668 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1669 | "inline_version", &xattr_buf, | |
1670 | sizeof(xattr_buf), | |
1671 | CEPH_OSD_CMPXATTR_OP_GT, | |
1672 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1673 | if (err) | |
1674 | goto out_put; | |
1675 | } | |
1676 | ||
1677 | { | |
1678 | char xattr_buf[32]; | |
1679 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), | |
1680 | "%llu", inline_version); | |
1681 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1682 | "inline_version", | |
1683 | xattr_buf, xattr_len, 0, 0); | |
1684 | if (err) | |
1685 | goto out_put; | |
1686 | } | |
28127bdd | 1687 | |
bb873b53 | 1688 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1689 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1690 | if (!err) | |
1691 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1692 | out_put: | |
1693 | ceph_osdc_put_request(req); | |
1694 | if (err == -ECANCELED) | |
1695 | err = 0; | |
1696 | out: | |
1697 | if (page && page != locked_page) { | |
1698 | if (from_pagecache) { | |
1699 | unlock_page(page); | |
09cbfeaf | 1700 | put_page(page); |
28127bdd YZ |
1701 | } else |
1702 | __free_pages(page, 0); | |
1703 | } | |
1704 | ||
1705 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1706 | inode, ceph_vinop(inode), inline_version, err); | |
1707 | return err; | |
1708 | } | |
1709 | ||
7cbea8dc | 1710 | static const struct vm_operations_struct ceph_vmops = { |
61f68816 | 1711 | .fault = ceph_filemap_fault, |
1d3576fd SW |
1712 | .page_mkwrite = ceph_page_mkwrite, |
1713 | }; | |
1714 | ||
1715 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1716 | { | |
1717 | struct address_space *mapping = file->f_mapping; | |
1718 | ||
1719 | if (!mapping->a_ops->readpage) | |
1720 | return -ENOEXEC; | |
1721 | file_accessed(file); | |
1722 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1723 | return 0; |
1724 | } | |
10183a69 YZ |
1725 | |
1726 | enum { | |
1727 | POOL_READ = 1, | |
1728 | POOL_WRITE = 2, | |
1729 | }; | |
1730 | ||
779fe0fb YZ |
1731 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
1732 | s64 pool, struct ceph_string *pool_ns) | |
10183a69 YZ |
1733 | { |
1734 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1735 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1736 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; | |
1737 | struct rb_node **p, *parent; | |
1738 | struct ceph_pool_perm *perm; | |
1739 | struct page **pages; | |
779fe0fb | 1740 | size_t pool_ns_len; |
10183a69 YZ |
1741 | int err = 0, err2 = 0, have = 0; |
1742 | ||
1743 | down_read(&mdsc->pool_perm_rwsem); | |
1744 | p = &mdsc->pool_perm_tree.rb_node; | |
1745 | while (*p) { | |
1746 | perm = rb_entry(*p, struct ceph_pool_perm, node); | |
1747 | if (pool < perm->pool) | |
1748 | p = &(*p)->rb_left; | |
1749 | else if (pool > perm->pool) | |
1750 | p = &(*p)->rb_right; | |
1751 | else { | |
779fe0fb YZ |
1752 | int ret = ceph_compare_string(pool_ns, |
1753 | perm->pool_ns, | |
1754 | perm->pool_ns_len); | |
1755 | if (ret < 0) | |
1756 | p = &(*p)->rb_left; | |
1757 | else if (ret > 0) | |
1758 | p = &(*p)->rb_right; | |
1759 | else { | |
1760 | have = perm->perm; | |
1761 | break; | |
1762 | } | |
10183a69 YZ |
1763 | } |
1764 | } | |
1765 | up_read(&mdsc->pool_perm_rwsem); | |
1766 | if (*p) | |
1767 | goto out; | |
1768 | ||
779fe0fb YZ |
1769 | if (pool_ns) |
1770 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", | |
1771 | pool, (int)pool_ns->len, pool_ns->str); | |
1772 | else | |
1773 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); | |
10183a69 YZ |
1774 | |
1775 | down_write(&mdsc->pool_perm_rwsem); | |
779fe0fb | 1776 | p = &mdsc->pool_perm_tree.rb_node; |
10183a69 YZ |
1777 | parent = NULL; |
1778 | while (*p) { | |
1779 | parent = *p; | |
1780 | perm = rb_entry(parent, struct ceph_pool_perm, node); | |
1781 | if (pool < perm->pool) | |
1782 | p = &(*p)->rb_left; | |
1783 | else if (pool > perm->pool) | |
1784 | p = &(*p)->rb_right; | |
1785 | else { | |
779fe0fb YZ |
1786 | int ret = ceph_compare_string(pool_ns, |
1787 | perm->pool_ns, | |
1788 | perm->pool_ns_len); | |
1789 | if (ret < 0) | |
1790 | p = &(*p)->rb_left; | |
1791 | else if (ret > 0) | |
1792 | p = &(*p)->rb_right; | |
1793 | else { | |
1794 | have = perm->perm; | |
1795 | break; | |
1796 | } | |
10183a69 YZ |
1797 | } |
1798 | } | |
1799 | if (*p) { | |
1800 | up_write(&mdsc->pool_perm_rwsem); | |
1801 | goto out; | |
1802 | } | |
1803 | ||
34b759b4 | 1804 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1805 | 1, false, GFP_NOFS); |
1806 | if (!rd_req) { | |
1807 | err = -ENOMEM; | |
1808 | goto out_unlock; | |
1809 | } | |
1810 | ||
1811 | rd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1812 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); | |
1813 | rd_req->r_base_oloc.pool = pool; | |
779fe0fb YZ |
1814 | if (pool_ns) |
1815 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); | |
d30291b9 | 1816 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
10183a69 | 1817 | |
13d1ad16 ID |
1818 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
1819 | if (err) | |
1820 | goto out_unlock; | |
10183a69 | 1821 | |
34b759b4 | 1822 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1823 | 1, false, GFP_NOFS); |
1824 | if (!wr_req) { | |
1825 | err = -ENOMEM; | |
1826 | goto out_unlock; | |
1827 | } | |
1828 | ||
fe5da05e | 1829 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ACK; |
10183a69 | 1830 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
63244fa1 | 1831 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
d30291b9 | 1832 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
10183a69 | 1833 | |
13d1ad16 ID |
1834 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
1835 | if (err) | |
1836 | goto out_unlock; | |
10183a69 YZ |
1837 | |
1838 | /* one page should be large enough for STAT data */ | |
1839 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); | |
1840 | if (IS_ERR(pages)) { | |
1841 | err = PTR_ERR(pages); | |
1842 | goto out_unlock; | |
1843 | } | |
1844 | ||
1845 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, | |
1846 | 0, false, true); | |
10183a69 YZ |
1847 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
1848 | ||
bb873b53 | 1849 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
10183a69 YZ |
1850 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
1851 | ||
1852 | if (!err) | |
1853 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); | |
1854 | if (!err2) | |
1855 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); | |
1856 | ||
1857 | if (err >= 0 || err == -ENOENT) | |
1858 | have |= POOL_READ; | |
1859 | else if (err != -EPERM) | |
1860 | goto out_unlock; | |
1861 | ||
1862 | if (err2 == 0 || err2 == -EEXIST) | |
1863 | have |= POOL_WRITE; | |
1864 | else if (err2 != -EPERM) { | |
1865 | err = err2; | |
1866 | goto out_unlock; | |
1867 | } | |
1868 | ||
779fe0fb YZ |
1869 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
1870 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); | |
10183a69 YZ |
1871 | if (!perm) { |
1872 | err = -ENOMEM; | |
1873 | goto out_unlock; | |
1874 | } | |
1875 | ||
1876 | perm->pool = pool; | |
1877 | perm->perm = have; | |
779fe0fb YZ |
1878 | perm->pool_ns_len = pool_ns_len; |
1879 | if (pool_ns_len > 0) | |
1880 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); | |
1881 | perm->pool_ns[pool_ns_len] = 0; | |
1882 | ||
10183a69 YZ |
1883 | rb_link_node(&perm->node, parent, p); |
1884 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); | |
1885 | err = 0; | |
1886 | out_unlock: | |
1887 | up_write(&mdsc->pool_perm_rwsem); | |
1888 | ||
3ed97d63 ID |
1889 | ceph_osdc_put_request(rd_req); |
1890 | ceph_osdc_put_request(wr_req); | |
10183a69 YZ |
1891 | out: |
1892 | if (!err) | |
1893 | err = have; | |
779fe0fb YZ |
1894 | if (pool_ns) |
1895 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", | |
1896 | pool, (int)pool_ns->len, pool_ns->str, err); | |
1897 | else | |
1898 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); | |
10183a69 YZ |
1899 | return err; |
1900 | } | |
1901 | ||
1902 | int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) | |
1903 | { | |
7627151e | 1904 | s64 pool; |
779fe0fb | 1905 | struct ceph_string *pool_ns; |
10183a69 YZ |
1906 | int ret, flags; |
1907 | ||
1908 | if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), | |
1909 | NOPOOLPERM)) | |
1910 | return 0; | |
1911 | ||
1912 | spin_lock(&ci->i_ceph_lock); | |
1913 | flags = ci->i_ceph_flags; | |
7627151e | 1914 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
1915 | spin_unlock(&ci->i_ceph_lock); |
1916 | check: | |
1917 | if (flags & CEPH_I_POOL_PERM) { | |
1918 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { | |
7627151e | 1919 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
10183a69 YZ |
1920 | pool); |
1921 | return -EPERM; | |
1922 | } | |
1923 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { | |
7627151e | 1924 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
10183a69 YZ |
1925 | pool); |
1926 | return -EPERM; | |
1927 | } | |
1928 | return 0; | |
1929 | } | |
1930 | ||
779fe0fb YZ |
1931 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
1932 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); | |
1933 | ceph_put_string(pool_ns); | |
10183a69 YZ |
1934 | if (ret < 0) |
1935 | return ret; | |
1936 | ||
1937 | flags = CEPH_I_POOL_PERM; | |
1938 | if (ret & POOL_READ) | |
1939 | flags |= CEPH_I_POOL_RD; | |
1940 | if (ret & POOL_WRITE) | |
1941 | flags |= CEPH_I_POOL_WR; | |
1942 | ||
1943 | spin_lock(&ci->i_ceph_lock); | |
779fe0fb YZ |
1944 | if (pool == ci->i_layout.pool_id && |
1945 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { | |
1946 | ci->i_ceph_flags |= flags; | |
10183a69 | 1947 | } else { |
7627151e | 1948 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
1949 | flags = ci->i_ceph_flags; |
1950 | } | |
1951 | spin_unlock(&ci->i_ceph_lock); | |
1952 | goto check; | |
1953 | } | |
1954 | ||
1955 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) | |
1956 | { | |
1957 | struct ceph_pool_perm *perm; | |
1958 | struct rb_node *n; | |
1959 | ||
1960 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { | |
1961 | n = rb_first(&mdsc->pool_perm_tree); | |
1962 | perm = rb_entry(n, struct ceph_pool_perm, node); | |
1963 | rb_erase(n, &mdsc->pool_perm_tree); | |
1964 | kfree(perm); | |
1965 | } | |
1966 | } |