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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
1d3576fd SW |
3 | |
4 | #include <linux/backing-dev.h> | |
5 | #include <linux/fs.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/pagemap.h> | |
8 | #include <linux/writeback.h> /* generic_writepages */ | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
1d3576fd SW |
10 | #include <linux/pagevec.h> |
11 | #include <linux/task_io_accounting_ops.h> | |
f361bf4a | 12 | #include <linux/signal.h> |
5c308356 | 13 | #include <linux/iversion.h> |
97e27aaa | 14 | #include <linux/ktime.h> |
1d3576fd SW |
15 | |
16 | #include "super.h" | |
3d14c5d2 | 17 | #include "mds_client.h" |
99ccbd22 | 18 | #include "cache.h" |
97e27aaa | 19 | #include "metric.h" |
3d14c5d2 | 20 | #include <linux/ceph/osd_client.h> |
08c1ac50 | 21 | #include <linux/ceph/striper.h> |
1d3576fd SW |
22 | |
23 | /* | |
24 | * Ceph address space ops. | |
25 | * | |
26 | * There are a few funny things going on here. | |
27 | * | |
28 | * The page->private field is used to reference a struct | |
29 | * ceph_snap_context for _every_ dirty page. This indicates which | |
30 | * snapshot the page was logically dirtied in, and thus which snap | |
31 | * context needs to be associated with the osd write during writeback. | |
32 | * | |
33 | * Similarly, struct ceph_inode_info maintains a set of counters to | |
25985edc | 34 | * count dirty pages on the inode. In the absence of snapshots, |
1d3576fd SW |
35 | * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. |
36 | * | |
37 | * When a snapshot is taken (that is, when the client receives | |
38 | * notification that a snapshot was taken), each inode with caps and | |
39 | * with dirty pages (dirty pages implies there is a cap) gets a new | |
40 | * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending | |
41 | * order, new snaps go to the tail). The i_wrbuffer_ref_head count is | |
42 | * moved to capsnap->dirty. (Unless a sync write is currently in | |
43 | * progress. In that case, the capsnap is said to be "pending", new | |
44 | * writes cannot start, and the capsnap isn't "finalized" until the | |
45 | * write completes (or fails) and a final size/mtime for the inode for | |
46 | * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. | |
47 | * | |
48 | * On writeback, we must submit writes to the osd IN SNAP ORDER. So, | |
49 | * we look for the first capsnap in i_cap_snaps and write out pages in | |
50 | * that snap context _only_. Then we move on to the next capsnap, | |
51 | * eventually reaching the "live" or "head" context (i.e., pages that | |
52 | * are not yet snapped) and are writing the most recently dirtied | |
53 | * pages. | |
54 | * | |
55 | * Invalidate and so forth must take care to ensure the dirty page | |
56 | * accounting is preserved. | |
57 | */ | |
58 | ||
2baba250 YS |
59 | #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) |
60 | #define CONGESTION_OFF_THRESH(congestion_kb) \ | |
61 | (CONGESTION_ON_THRESH(congestion_kb) - \ | |
62 | (CONGESTION_ON_THRESH(congestion_kb) >> 2)) | |
63 | ||
61600ef8 YZ |
64 | static inline struct ceph_snap_context *page_snap_context(struct page *page) |
65 | { | |
66 | if (PagePrivate(page)) | |
67 | return (void *)page->private; | |
68 | return NULL; | |
69 | } | |
1d3576fd SW |
70 | |
71 | /* | |
72 | * Dirty a page. Optimistically adjust accounting, on the assumption | |
73 | * that we won't race with invalidate. If we do, readjust. | |
74 | */ | |
75 | static int ceph_set_page_dirty(struct page *page) | |
76 | { | |
77 | struct address_space *mapping = page->mapping; | |
78 | struct inode *inode; | |
79 | struct ceph_inode_info *ci; | |
1d3576fd | 80 | struct ceph_snap_context *snapc; |
7d6e1f54 | 81 | int ret; |
1d3576fd SW |
82 | |
83 | if (unlikely(!mapping)) | |
84 | return !TestSetPageDirty(page); | |
85 | ||
7d6e1f54 | 86 | if (PageDirty(page)) { |
1d3576fd SW |
87 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
88 | mapping->host, page, page->index); | |
7d6e1f54 | 89 | BUG_ON(!PagePrivate(page)); |
1d3576fd SW |
90 | return 0; |
91 | } | |
92 | ||
93 | inode = mapping->host; | |
94 | ci = ceph_inode(inode); | |
95 | ||
1d3576fd | 96 | /* dirty the head */ |
be655596 | 97 | spin_lock(&ci->i_ceph_lock); |
5dda377c YZ |
98 | BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference |
99 | if (__ceph_have_pending_cap_snap(ci)) { | |
100 | struct ceph_cap_snap *capsnap = | |
101 | list_last_entry(&ci->i_cap_snaps, | |
102 | struct ceph_cap_snap, | |
103 | ci_item); | |
104 | snapc = ceph_get_snap_context(capsnap->context); | |
105 | capsnap->dirty_pages++; | |
106 | } else { | |
107 | BUG_ON(!ci->i_head_snapc); | |
108 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
109 | ++ci->i_wrbuffer_ref_head; | |
110 | } | |
1d3576fd | 111 | if (ci->i_wrbuffer_ref == 0) |
0444d76a | 112 | ihold(inode); |
1d3576fd SW |
113 | ++ci->i_wrbuffer_ref; |
114 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " | |
115 | "snapc %p seq %lld (%d snaps)\n", | |
116 | mapping->host, page, page->index, | |
117 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, | |
118 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
119 | snapc, snapc->seq, snapc->num_snaps); | |
be655596 | 120 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd | 121 | |
7d6e1f54 SZ |
122 | /* |
123 | * Reference snap context in page->private. Also set | |
124 | * PagePrivate so that we get invalidatepage callback. | |
125 | */ | |
126 | BUG_ON(PagePrivate(page)); | |
127 | page->private = (unsigned long)snapc; | |
128 | SetPagePrivate(page); | |
1d3576fd | 129 | |
7d6e1f54 SZ |
130 | ret = __set_page_dirty_nobuffers(page); |
131 | WARN_ON(!PageLocked(page)); | |
132 | WARN_ON(!page->mapping); | |
1d3576fd | 133 | |
7d6e1f54 | 134 | return ret; |
1d3576fd SW |
135 | } |
136 | ||
137 | /* | |
138 | * If we are truncating the full page (i.e. offset == 0), adjust the | |
139 | * dirty page counters appropriately. Only called if there is private | |
140 | * data on the page. | |
141 | */ | |
d47992f8 LC |
142 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
143 | unsigned int length) | |
1d3576fd | 144 | { |
4ce1e9ad | 145 | struct inode *inode; |
1d3576fd | 146 | struct ceph_inode_info *ci; |
61600ef8 | 147 | struct ceph_snap_context *snapc = page_snap_context(page); |
1d3576fd | 148 | |
4ce1e9ad | 149 | inode = page->mapping->host; |
b150f5c1 MT |
150 | ci = ceph_inode(inode); |
151 | ||
09cbfeaf | 152 | if (offset != 0 || length != PAGE_SIZE) { |
b150f5c1 MT |
153 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
154 | inode, page, page->index, offset, length); | |
155 | return; | |
156 | } | |
4ce1e9ad | 157 | |
99ccbd22 MT |
158 | ceph_invalidate_fscache_page(inode, page); |
159 | ||
b072d774 | 160 | WARN_ON(!PageLocked(page)); |
99ccbd22 MT |
161 | if (!PagePrivate(page)) |
162 | return; | |
163 | ||
b150f5c1 MT |
164 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
165 | inode, page, page->index); | |
166 | ||
167 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
168 | ceph_put_snap_context(snapc); | |
169 | page->private = 0; | |
170 | ClearPagePrivate(page); | |
1d3576fd SW |
171 | } |
172 | ||
1d3576fd SW |
173 | static int ceph_releasepage(struct page *page, gfp_t g) |
174 | { | |
e55f1a18 N |
175 | dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, |
176 | page, page->index, PageDirty(page) ? "" : "not "); | |
99ccbd22 MT |
177 | |
178 | /* Can we release the page from the cache? */ | |
179 | if (!ceph_release_fscache_page(page, g)) | |
180 | return 0; | |
181 | ||
182 | return !PagePrivate(page); | |
1d3576fd SW |
183 | } |
184 | ||
9b4862ec | 185 | /* read a single page, without unlocking it. */ |
dd2bc473 | 186 | static int ceph_do_readpage(struct file *filp, struct page *page) |
1d3576fd | 187 | { |
496ad9aa | 188 | struct inode *inode = file_inode(filp); |
1d3576fd | 189 | struct ceph_inode_info *ci = ceph_inode(inode); |
131d7eb4 | 190 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
9b4862ec JL |
191 | struct ceph_osd_client *osdc = &fsc->client->osdc; |
192 | struct ceph_osd_request *req; | |
193 | struct ceph_vino vino = ceph_vino(inode); | |
1d3576fd | 194 | int err = 0; |
83701246 | 195 | u64 off = page_offset(page); |
09cbfeaf | 196 | u64 len = PAGE_SIZE; |
1d3576fd | 197 | |
83701246 | 198 | if (off >= i_size_read(inode)) { |
09cbfeaf | 199 | zero_user_segment(page, 0, PAGE_SIZE); |
83701246 YZ |
200 | SetPageUptodate(page); |
201 | return 0; | |
202 | } | |
99ccbd22 | 203 | |
fcc02d2a YZ |
204 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
205 | /* | |
206 | * Uptodate inline data should have been added | |
207 | * into page cache while getting Fcr caps. | |
208 | */ | |
209 | if (off == 0) | |
210 | return -EINVAL; | |
09cbfeaf | 211 | zero_user_segment(page, 0, PAGE_SIZE); |
fcc02d2a YZ |
212 | SetPageUptodate(page); |
213 | return 0; | |
214 | } | |
83701246 YZ |
215 | |
216 | err = ceph_readpage_from_fscache(inode, page); | |
99ccbd22 | 217 | if (err == 0) |
dd2bc473 | 218 | return -EINPROGRESS; |
99ccbd22 | 219 | |
9b4862ec JL |
220 | dout("readpage ino %llx.%llx file %p off %llu len %llu page %p index %lu\n", |
221 | vino.ino, vino.snap, filp, off, len, page, page->index); | |
222 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 0, 1, | |
223 | CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, | |
224 | ci->i_truncate_seq, ci->i_truncate_size, | |
225 | false); | |
226 | if (IS_ERR(req)) | |
227 | return PTR_ERR(req); | |
228 | ||
229 | osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false); | |
230 | ||
231 | err = ceph_osdc_start_request(osdc, req, false); | |
232 | if (!err) | |
233 | err = ceph_osdc_wait_request(osdc, req); | |
234 | ||
235 | ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, | |
236 | req->r_end_latency, err); | |
237 | ||
238 | ceph_osdc_put_request(req); | |
239 | dout("readpage result %d\n", err); | |
240 | ||
1d3576fd SW |
241 | if (err == -ENOENT) |
242 | err = 0; | |
243 | if (err < 0) { | |
18302805 | 244 | ceph_fscache_readpage_cancel(inode, page); |
0b98acd6 ID |
245 | if (err == -EBLOCKLISTED) |
246 | fsc->blocklisted = true; | |
1d3576fd | 247 | goto out; |
1d3576fd | 248 | } |
09cbfeaf | 249 | if (err < PAGE_SIZE) |
23cd573b | 250 | /* zero fill remainder of page */ |
09cbfeaf | 251 | zero_user_segment(page, err, PAGE_SIZE); |
23cd573b ZZ |
252 | else |
253 | flush_dcache_page(page); | |
1d3576fd | 254 | |
23cd573b ZZ |
255 | SetPageUptodate(page); |
256 | ceph_readpage_to_fscache(inode, page); | |
99ccbd22 | 257 | |
1d3576fd SW |
258 | out: |
259 | return err < 0 ? err : 0; | |
260 | } | |
261 | ||
262 | static int ceph_readpage(struct file *filp, struct page *page) | |
263 | { | |
dd2bc473 YZ |
264 | int r = ceph_do_readpage(filp, page); |
265 | if (r != -EINPROGRESS) | |
266 | unlock_page(page); | |
267 | else | |
268 | r = 0; | |
1d3576fd SW |
269 | return r; |
270 | } | |
271 | ||
272 | /* | |
7c272194 | 273 | * Finish an async read(ahead) op. |
1d3576fd | 274 | */ |
85e084fe | 275 | static void finish_read(struct ceph_osd_request *req) |
1d3576fd | 276 | { |
7c272194 | 277 | struct inode *inode = req->r_inode; |
97e27aaa | 278 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
87060c10 | 279 | struct ceph_osd_data *osd_data; |
85e084fe ID |
280 | int rc = req->r_result <= 0 ? req->r_result : 0; |
281 | int bytes = req->r_result >= 0 ? req->r_result : 0; | |
e0c59487 | 282 | int num_pages; |
7c272194 | 283 | int i; |
1d3576fd | 284 | |
7c272194 | 285 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
0b98acd6 ID |
286 | if (rc == -EBLOCKLISTED) |
287 | ceph_inode_to_client(inode)->blocklisted = true; | |
7c272194 SW |
288 | |
289 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 290 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
291 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
292 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
293 | (u64)osd_data->length); | |
e0c59487 | 294 | for (i = 0; i < num_pages; i++) { |
87060c10 | 295 | struct page *page = osd_data->pages[i]; |
7c272194 | 296 | |
368e3585 YZ |
297 | if (rc < 0 && rc != -ENOENT) { |
298 | ceph_fscache_readpage_cancel(inode, page); | |
f36132a7 | 299 | goto unlock; |
368e3585 | 300 | } |
09cbfeaf | 301 | if (bytes < (int)PAGE_SIZE) { |
7c272194 SW |
302 | /* zero (remainder of) page */ |
303 | int s = bytes < 0 ? 0 : bytes; | |
09cbfeaf | 304 | zero_user_segment(page, s, PAGE_SIZE); |
1d3576fd | 305 | } |
7c272194 SW |
306 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
307 | page->index); | |
308 | flush_dcache_page(page); | |
309 | SetPageUptodate(page); | |
99ccbd22 | 310 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 311 | unlock: |
7c272194 | 312 | unlock_page(page); |
09cbfeaf KS |
313 | put_page(page); |
314 | bytes -= PAGE_SIZE; | |
1d3576fd | 315 | } |
97e27aaa XL |
316 | |
317 | ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, | |
318 | req->r_end_latency, rc); | |
319 | ||
87060c10 | 320 | kfree(osd_data->pages); |
1d3576fd SW |
321 | } |
322 | ||
323 | /* | |
7c272194 SW |
324 | * start an async read(ahead) operation. return nr_pages we submitted |
325 | * a read for on success, or negative error code. | |
1d3576fd | 326 | */ |
5d988308 YZ |
327 | static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, |
328 | struct list_head *page_list, int max) | |
1d3576fd | 329 | { |
3d14c5d2 YS |
330 | struct ceph_osd_client *osdc = |
331 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 | 332 | struct ceph_inode_info *ci = ceph_inode(inode); |
f86196ea | 333 | struct page *page = lru_to_page(page_list); |
acead002 | 334 | struct ceph_vino vino; |
7c272194 SW |
335 | struct ceph_osd_request *req; |
336 | u64 off; | |
1d3576fd | 337 | u64 len; |
7c272194 SW |
338 | int i; |
339 | struct page **pages; | |
340 | pgoff_t next_index; | |
341 | int nr_pages = 0; | |
2b1ac852 YZ |
342 | int got = 0; |
343 | int ret = 0; | |
344 | ||
5d988308 | 345 | if (!rw_ctx) { |
2b1ac852 YZ |
346 | /* caller of readpages does not hold buffer and read caps |
347 | * (fadvise, madvise and readahead cases) */ | |
348 | int want = CEPH_CAP_FILE_CACHE; | |
5e3ded1b YZ |
349 | ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, |
350 | true, &got); | |
2b1ac852 YZ |
351 | if (ret < 0) { |
352 | dout("start_read %p, error getting cap\n", inode); | |
353 | } else if (!(got & want)) { | |
354 | dout("start_read %p, no cache cap\n", inode); | |
355 | ret = 0; | |
356 | } | |
357 | if (ret <= 0) { | |
358 | if (got) | |
359 | ceph_put_cap_refs(ci, got); | |
360 | while (!list_empty(page_list)) { | |
f86196ea | 361 | page = lru_to_page(page_list); |
2b1ac852 YZ |
362 | list_del(&page->lru); |
363 | put_page(page); | |
364 | } | |
365 | return ret; | |
366 | } | |
367 | } | |
1d3576fd | 368 | |
6285bc23 | 369 | off = (u64) page_offset(page); |
1d3576fd | 370 | |
7c272194 SW |
371 | /* count pages */ |
372 | next_index = page->index; | |
373 | list_for_each_entry_reverse(page, page_list, lru) { | |
374 | if (page->index != next_index) | |
375 | break; | |
376 | nr_pages++; | |
377 | next_index++; | |
0d66a487 SW |
378 | if (max && nr_pages == max) |
379 | break; | |
7c272194 | 380 | } |
09cbfeaf | 381 | len = nr_pages << PAGE_SHIFT; |
7c272194 SW |
382 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
383 | off, len); | |
acead002 AE |
384 | vino = ceph_vino(inode); |
385 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 386 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 387 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 388 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 389 | false); |
2b1ac852 YZ |
390 | if (IS_ERR(req)) { |
391 | ret = PTR_ERR(req); | |
392 | goto out; | |
393 | } | |
1d3576fd | 394 | |
7c272194 | 395 | /* build page vector */ |
cf7b7e14 | 396 | nr_pages = calc_pages_for(0, len); |
6da2ec56 | 397 | pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); |
2b1ac852 YZ |
398 | if (!pages) { |
399 | ret = -ENOMEM; | |
400 | goto out_put; | |
401 | } | |
7c272194 SW |
402 | for (i = 0; i < nr_pages; ++i) { |
403 | page = list_entry(page_list->prev, struct page, lru); | |
404 | BUG_ON(PageLocked(page)); | |
1d3576fd | 405 | list_del(&page->lru); |
99ccbd22 | 406 | |
7c272194 SW |
407 | dout("start_read %p adding %p idx %lu\n", inode, page, |
408 | page->index); | |
409 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
687265e5 | 410 | GFP_KERNEL)) { |
d4d3aa38 | 411 | ceph_fscache_uncache_page(inode, page); |
09cbfeaf | 412 | put_page(page); |
7c272194 | 413 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 414 | inode, page); |
7c272194 | 415 | nr_pages = i; |
1afe4785 YZ |
416 | if (nr_pages > 0) { |
417 | len = nr_pages << PAGE_SHIFT; | |
d641df81 | 418 | osd_req_op_extent_update(req, 0, len); |
1afe4785 YZ |
419 | break; |
420 | } | |
7c272194 | 421 | goto out_pages; |
1d3576fd | 422 | } |
7c272194 | 423 | pages[i] = page; |
1d3576fd | 424 | } |
406e2c9f | 425 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
426 | req->r_callback = finish_read; |
427 | req->r_inode = inode; | |
428 | ||
429 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); | |
430 | ret = ceph_osdc_start_request(osdc, req, false); | |
431 | if (ret < 0) | |
432 | goto out_pages; | |
433 | ceph_osdc_put_request(req); | |
2b1ac852 YZ |
434 | |
435 | /* After adding locked pages to page cache, the inode holds cache cap. | |
436 | * So we can drop our cap refs. */ | |
437 | if (got) | |
438 | ceph_put_cap_refs(ci, got); | |
439 | ||
7c272194 SW |
440 | return nr_pages; |
441 | ||
442 | out_pages: | |
1afe4785 YZ |
443 | for (i = 0; i < nr_pages; ++i) { |
444 | ceph_fscache_readpage_cancel(inode, pages[i]); | |
445 | unlock_page(pages[i]); | |
446 | } | |
447 | ceph_put_page_vector(pages, nr_pages, false); | |
2b1ac852 | 448 | out_put: |
7c272194 | 449 | ceph_osdc_put_request(req); |
2b1ac852 YZ |
450 | out: |
451 | if (got) | |
452 | ceph_put_cap_refs(ci, got); | |
7c272194 SW |
453 | return ret; |
454 | } | |
1d3576fd | 455 | |
7c272194 SW |
456 | |
457 | /* | |
458 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
459 | * the caller (VM) cleans them up. | |
460 | */ | |
461 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
462 | struct list_head *page_list, unsigned nr_pages) | |
463 | { | |
496ad9aa | 464 | struct inode *inode = file_inode(file); |
0d66a487 | 465 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
73737682 | 466 | struct ceph_file_info *fi = file->private_data; |
5d988308 | 467 | struct ceph_rw_context *rw_ctx; |
7c272194 | 468 | int rc = 0; |
0d66a487 SW |
469 | int max = 0; |
470 | ||
83701246 YZ |
471 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
472 | return -EINVAL; | |
473 | ||
99ccbd22 MT |
474 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
475 | &nr_pages); | |
476 | ||
477 | if (rc == 0) | |
478 | goto out; | |
479 | ||
73737682 | 480 | rw_ctx = ceph_find_rw_context(fi); |
aa187926 | 481 | max = fsc->mount_options->rsize >> PAGE_SHIFT; |
5d988308 YZ |
482 | dout("readpages %p file %p ctx %p nr_pages %d max %d\n", |
483 | inode, file, rw_ctx, nr_pages, max); | |
7c272194 | 484 | while (!list_empty(page_list)) { |
5d988308 | 485 | rc = start_read(inode, rw_ctx, page_list, max); |
7c272194 SW |
486 | if (rc < 0) |
487 | goto out; | |
7c272194 | 488 | } |
1d3576fd | 489 | out: |
76be778b MT |
490 | ceph_fscache_readpages_cancel(inode, page_list); |
491 | ||
7c272194 | 492 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
493 | return rc; |
494 | } | |
495 | ||
1f934b00 YZ |
496 | struct ceph_writeback_ctl |
497 | { | |
498 | loff_t i_size; | |
499 | u64 truncate_size; | |
500 | u32 truncate_seq; | |
501 | bool size_stable; | |
2a2d927e | 502 | bool head_snapc; |
1f934b00 YZ |
503 | }; |
504 | ||
1d3576fd SW |
505 | /* |
506 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
507 | * only snap context we are allowed to write back. | |
1d3576fd | 508 | */ |
1f934b00 | 509 | static struct ceph_snap_context * |
05455e11 YZ |
510 | get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, |
511 | struct ceph_snap_context *page_snapc) | |
1d3576fd SW |
512 | { |
513 | struct ceph_inode_info *ci = ceph_inode(inode); | |
514 | struct ceph_snap_context *snapc = NULL; | |
515 | struct ceph_cap_snap *capsnap = NULL; | |
516 | ||
be655596 | 517 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
518 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
519 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
520 | capsnap->context, capsnap->dirty_pages); | |
05455e11 YZ |
521 | if (!capsnap->dirty_pages) |
522 | continue; | |
523 | ||
524 | /* get i_size, truncate_{seq,size} for page_snapc? */ | |
525 | if (snapc && capsnap->context != page_snapc) | |
526 | continue; | |
527 | ||
528 | if (ctl) { | |
529 | if (capsnap->writing) { | |
530 | ctl->i_size = i_size_read(inode); | |
531 | ctl->size_stable = false; | |
532 | } else { | |
533 | ctl->i_size = capsnap->size; | |
534 | ctl->size_stable = true; | |
1f934b00 | 535 | } |
05455e11 YZ |
536 | ctl->truncate_size = capsnap->truncate_size; |
537 | ctl->truncate_seq = capsnap->truncate_seq; | |
2a2d927e | 538 | ctl->head_snapc = false; |
1d3576fd | 539 | } |
05455e11 YZ |
540 | |
541 | if (snapc) | |
542 | break; | |
543 | ||
544 | snapc = ceph_get_snap_context(capsnap->context); | |
545 | if (!page_snapc || | |
546 | page_snapc == snapc || | |
547 | page_snapc->seq > snapc->seq) | |
548 | break; | |
1d3576fd | 549 | } |
7d8cb26d | 550 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 551 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
552 | dout(" head snapc %p has %d dirty pages\n", |
553 | snapc, ci->i_wrbuffer_ref_head); | |
1f934b00 YZ |
554 | if (ctl) { |
555 | ctl->i_size = i_size_read(inode); | |
556 | ctl->truncate_size = ci->i_truncate_size; | |
557 | ctl->truncate_seq = ci->i_truncate_seq; | |
558 | ctl->size_stable = false; | |
2a2d927e | 559 | ctl->head_snapc = true; |
1f934b00 | 560 | } |
1d3576fd | 561 | } |
be655596 | 562 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
563 | return snapc; |
564 | } | |
565 | ||
1f934b00 YZ |
566 | static u64 get_writepages_data_length(struct inode *inode, |
567 | struct page *page, u64 start) | |
568 | { | |
569 | struct ceph_inode_info *ci = ceph_inode(inode); | |
570 | struct ceph_snap_context *snapc = page_snap_context(page); | |
571 | struct ceph_cap_snap *capsnap = NULL; | |
572 | u64 end = i_size_read(inode); | |
573 | ||
574 | if (snapc != ci->i_head_snapc) { | |
575 | bool found = false; | |
576 | spin_lock(&ci->i_ceph_lock); | |
577 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
578 | if (capsnap->context == snapc) { | |
579 | if (!capsnap->writing) | |
580 | end = capsnap->size; | |
581 | found = true; | |
582 | break; | |
583 | } | |
584 | } | |
585 | spin_unlock(&ci->i_ceph_lock); | |
586 | WARN_ON(!found); | |
587 | } | |
588 | if (end > page_offset(page) + PAGE_SIZE) | |
589 | end = page_offset(page) + PAGE_SIZE; | |
590 | return end > start ? end - start : 0; | |
591 | } | |
592 | ||
1d3576fd SW |
593 | /* |
594 | * Write a single page, but leave the page locked. | |
595 | * | |
b72b13eb | 596 | * If we get a write error, mark the mapping for error, but still adjust the |
1d3576fd SW |
597 | * dirty page accounting (i.e., page is no longer dirty). |
598 | */ | |
599 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
600 | { | |
6390987f JL |
601 | struct inode *inode = page->mapping->host; |
602 | struct ceph_inode_info *ci = ceph_inode(inode); | |
603 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
6298a337 | 604 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 605 | loff_t page_off = page_offset(page); |
6390987f JL |
606 | int err; |
607 | loff_t len = PAGE_SIZE; | |
1f934b00 | 608 | struct ceph_writeback_ctl ceph_wbc; |
6390987f JL |
609 | struct ceph_osd_client *osdc = &fsc->client->osdc; |
610 | struct ceph_osd_request *req; | |
1d3576fd SW |
611 | |
612 | dout("writepage %p idx %lu\n", page, page->index); | |
613 | ||
1d3576fd | 614 | /* verify this is a writeable snap context */ |
61600ef8 | 615 | snapc = page_snap_context(page); |
d37b1d99 | 616 | if (!snapc) { |
1d3576fd | 617 | dout("writepage %p page %p not dirty?\n", inode, page); |
43986881 | 618 | return 0; |
1d3576fd | 619 | } |
05455e11 | 620 | oldest = get_oldest_context(inode, &ceph_wbc, snapc); |
6298a337 | 621 | if (snapc->seq > oldest->seq) { |
1d3576fd | 622 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 623 | inode, page, snapc); |
1d3576fd | 624 | /* we should only noop if called by kswapd */ |
fa71fefb | 625 | WARN_ON(!(current->flags & PF_MEMALLOC)); |
6298a337 | 626 | ceph_put_snap_context(oldest); |
fa71fefb | 627 | redirty_page_for_writepage(wbc, page); |
43986881 | 628 | return 0; |
1d3576fd | 629 | } |
6298a337 | 630 | ceph_put_snap_context(oldest); |
1d3576fd SW |
631 | |
632 | /* is this a partial page at end of file? */ | |
1f934b00 YZ |
633 | if (page_off >= ceph_wbc.i_size) { |
634 | dout("%p page eof %llu\n", page, ceph_wbc.i_size); | |
05455e11 | 635 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
43986881 | 636 | return 0; |
fc2744aa | 637 | } |
43986881 | 638 | |
1f934b00 YZ |
639 | if (ceph_wbc.i_size < page_off + len) |
640 | len = ceph_wbc.i_size - page_off; | |
1d3576fd | 641 | |
6390987f | 642 | dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n", |
1c0a9c2d | 643 | inode, page, page->index, page_off, len, snapc, snapc->seq); |
1d3576fd | 644 | |
314c4737 | 645 | if (atomic_long_inc_return(&fsc->writeback_count) > |
3d14c5d2 | 646 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
09dc9fc2 | 647 | set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
2baba250 | 648 | |
1d3576fd | 649 | set_page_writeback(page); |
6390987f JL |
650 | req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1, |
651 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc, | |
652 | ceph_wbc.truncate_seq, ceph_wbc.truncate_size, | |
653 | true); | |
654 | if (IS_ERR(req)) { | |
655 | redirty_page_for_writepage(wbc, page); | |
656 | end_page_writeback(page); | |
657 | return PTR_ERR(req); | |
658 | } | |
659 | ||
660 | /* it may be a short write due to an object boundary */ | |
661 | WARN_ON_ONCE(len > PAGE_SIZE); | |
662 | osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false); | |
663 | dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len); | |
664 | ||
665 | req->r_mtime = inode->i_mtime; | |
666 | err = ceph_osdc_start_request(osdc, req, true); | |
667 | if (!err) | |
668 | err = ceph_osdc_wait_request(osdc, req); | |
669 | ||
670 | ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, | |
671 | req->r_end_latency, err); | |
672 | ||
673 | ceph_osdc_put_request(req); | |
674 | if (err == 0) | |
675 | err = len; | |
676 | ||
1d3576fd | 677 | if (err < 0) { |
ad15ec06 YZ |
678 | struct writeback_control tmp_wbc; |
679 | if (!wbc) | |
680 | wbc = &tmp_wbc; | |
681 | if (err == -ERESTARTSYS) { | |
682 | /* killed by SIGKILL */ | |
683 | dout("writepage interrupted page %p\n", page); | |
684 | redirty_page_for_writepage(wbc, page); | |
685 | end_page_writeback(page); | |
43986881 | 686 | return err; |
ad15ec06 | 687 | } |
0b98acd6 ID |
688 | if (err == -EBLOCKLISTED) |
689 | fsc->blocklisted = true; | |
ad15ec06 YZ |
690 | dout("writepage setting page/mapping error %d %p\n", |
691 | err, page); | |
1d3576fd | 692 | mapping_set_error(&inode->i_data, err); |
ad15ec06 | 693 | wbc->pages_skipped++; |
1d3576fd SW |
694 | } else { |
695 | dout("writepage cleaned page %p\n", page); | |
696 | err = 0; /* vfs expects us to return 0 */ | |
697 | } | |
698 | page->private = 0; | |
699 | ClearPagePrivate(page); | |
700 | end_page_writeback(page); | |
701 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 702 | ceph_put_snap_context(snapc); /* page's reference */ |
314c4737 YZ |
703 | |
704 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
705 | CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) | |
706 | clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); | |
707 | ||
1d3576fd SW |
708 | return err; |
709 | } | |
710 | ||
711 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
712 | { | |
dbd646a8 YS |
713 | int err; |
714 | struct inode *inode = page->mapping->host; | |
715 | BUG_ON(!inode); | |
70b666c3 | 716 | ihold(inode); |
dbd646a8 | 717 | err = writepage_nounlock(page, wbc); |
ad15ec06 YZ |
718 | if (err == -ERESTARTSYS) { |
719 | /* direct memory reclaimer was killed by SIGKILL. return 0 | |
720 | * to prevent caller from setting mapping/page error */ | |
721 | err = 0; | |
722 | } | |
1d3576fd | 723 | unlock_page(page); |
dbd646a8 | 724 | iput(inode); |
1d3576fd SW |
725 | return err; |
726 | } | |
727 | ||
1d3576fd SW |
728 | /* |
729 | * async writeback completion handler. | |
730 | * | |
731 | * If we get an error, set the mapping error bit, but not the individual | |
732 | * page error bits. | |
733 | */ | |
85e084fe | 734 | static void writepages_finish(struct ceph_osd_request *req) |
1d3576fd SW |
735 | { |
736 | struct inode *inode = req->r_inode; | |
1d3576fd | 737 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 738 | struct ceph_osd_data *osd_data; |
1d3576fd | 739 | struct page *page; |
5b64640c YZ |
740 | int num_pages, total_pages = 0; |
741 | int i, j; | |
742 | int rc = req->r_result; | |
1d3576fd SW |
743 | struct ceph_snap_context *snapc = req->r_snapc; |
744 | struct address_space *mapping = inode->i_mapping; | |
3d14c5d2 | 745 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
5b64640c | 746 | bool remove_page; |
1d3576fd | 747 | |
5b64640c | 748 | dout("writepages_finish %p rc %d\n", inode, rc); |
26544c62 | 749 | if (rc < 0) { |
1d3576fd | 750 | mapping_set_error(mapping, rc); |
26544c62 | 751 | ceph_set_error_write(ci); |
0b98acd6 ID |
752 | if (rc == -EBLOCKLISTED) |
753 | fsc->blocklisted = true; | |
26544c62 JL |
754 | } else { |
755 | ceph_clear_error_write(ci); | |
756 | } | |
5b64640c | 757 | |
97e27aaa XL |
758 | ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, |
759 | req->r_end_latency, rc); | |
760 | ||
5b64640c YZ |
761 | /* |
762 | * We lost the cache cap, need to truncate the page before | |
763 | * it is unlocked, otherwise we'd truncate it later in the | |
764 | * page truncation thread, possibly losing some data that | |
765 | * raced its way in | |
766 | */ | |
767 | remove_page = !(ceph_caps_issued(ci) & | |
768 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); | |
1d3576fd SW |
769 | |
770 | /* clean all pages */ | |
5b64640c YZ |
771 | for (i = 0; i < req->r_num_ops; i++) { |
772 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) | |
773 | break; | |
e63dc5c7 | 774 | |
5b64640c YZ |
775 | osd_data = osd_req_op_extent_osd_data(req, i); |
776 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); | |
777 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
778 | (u64)osd_data->length); | |
779 | total_pages += num_pages; | |
780 | for (j = 0; j < num_pages; j++) { | |
781 | page = osd_data->pages[j]; | |
782 | BUG_ON(!page); | |
783 | WARN_ON(!PageUptodate(page)); | |
784 | ||
785 | if (atomic_long_dec_return(&fsc->writeback_count) < | |
786 | CONGESTION_OFF_THRESH( | |
787 | fsc->mount_options->congestion_kb)) | |
09dc9fc2 | 788 | clear_bdi_congested(inode_to_bdi(inode), |
5b64640c YZ |
789 | BLK_RW_ASYNC); |
790 | ||
791 | ceph_put_snap_context(page_snap_context(page)); | |
792 | page->private = 0; | |
793 | ClearPagePrivate(page); | |
794 | dout("unlocking %p\n", page); | |
795 | end_page_writeback(page); | |
796 | ||
797 | if (remove_page) | |
798 | generic_error_remove_page(inode->i_mapping, | |
799 | page); | |
800 | ||
801 | unlock_page(page); | |
802 | } | |
803 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", | |
804 | inode, osd_data->length, rc >= 0 ? num_pages : 0); | |
e63dc5c7 | 805 | |
96ac9158 | 806 | release_pages(osd_data->pages, num_pages); |
1d3576fd | 807 | } |
1d3576fd | 808 | |
5b64640c YZ |
809 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
810 | ||
811 | osd_data = osd_req_op_extent_osd_data(req, 0); | |
87060c10 | 812 | if (osd_data->pages_from_pool) |
a0102bda | 813 | mempool_free(osd_data->pages, ceph_wb_pagevec_pool); |
1d3576fd | 814 | else |
87060c10 | 815 | kfree(osd_data->pages); |
1d3576fd SW |
816 | ceph_osdc_put_request(req); |
817 | } | |
818 | ||
1d3576fd SW |
819 | /* |
820 | * initiate async writeback | |
821 | */ | |
822 | static int ceph_writepages_start(struct address_space *mapping, | |
823 | struct writeback_control *wbc) | |
824 | { | |
825 | struct inode *inode = mapping->host; | |
1d3576fd | 826 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
827 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
828 | struct ceph_vino vino = ceph_vino(inode); | |
2a2d927e | 829 | pgoff_t index, start_index, end = -1; |
80e755fe | 830 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd | 831 | struct pagevec pvec; |
1d3576fd | 832 | int rc = 0; |
93407472 | 833 | unsigned int wsize = i_blocksize(inode); |
1d3576fd | 834 | struct ceph_osd_request *req = NULL; |
1f934b00 | 835 | struct ceph_writeback_ctl ceph_wbc; |
590e9d98 | 836 | bool should_loop, range_whole = false; |
af9cc401 | 837 | bool done = false; |
1d3576fd | 838 | |
3fb99d48 | 839 | dout("writepages_start %p (mode=%s)\n", inode, |
1d3576fd SW |
840 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : |
841 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
842 | ||
50c9132d | 843 | if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { |
6c93df5d YZ |
844 | if (ci->i_wrbuffer_ref > 0) { |
845 | pr_warn_ratelimited( | |
846 | "writepage_start %p %lld forced umount\n", | |
847 | inode, ceph_ino(inode)); | |
848 | } | |
a341d4df | 849 | mapping_set_error(mapping, -EIO); |
1d3576fd SW |
850 | return -EIO; /* we're in a forced umount, don't write! */ |
851 | } | |
95cca2b4 | 852 | if (fsc->mount_options->wsize < wsize) |
3d14c5d2 | 853 | wsize = fsc->mount_options->wsize; |
1d3576fd | 854 | |
86679820 | 855 | pagevec_init(&pvec); |
1d3576fd | 856 | |
590e9d98 | 857 | start_index = wbc->range_cyclic ? mapping->writeback_index : 0; |
2a2d927e | 858 | index = start_index; |
1d3576fd SW |
859 | |
860 | retry: | |
861 | /* find oldest snap context with dirty data */ | |
05455e11 | 862 | snapc = get_oldest_context(inode, &ceph_wbc, NULL); |
1d3576fd SW |
863 | if (!snapc) { |
864 | /* hmm, why does writepages get called when there | |
865 | is no dirty data? */ | |
866 | dout(" no snap context with dirty data?\n"); | |
867 | goto out; | |
868 | } | |
869 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", | |
870 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa | 871 | |
2a2d927e YZ |
872 | should_loop = false; |
873 | if (ceph_wbc.head_snapc && snapc != last_snapc) { | |
874 | /* where to start/end? */ | |
875 | if (wbc->range_cyclic) { | |
876 | index = start_index; | |
877 | end = -1; | |
878 | if (index > 0) | |
879 | should_loop = true; | |
880 | dout(" cyclic, start at %lu\n", index); | |
881 | } else { | |
882 | index = wbc->range_start >> PAGE_SHIFT; | |
883 | end = wbc->range_end >> PAGE_SHIFT; | |
884 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
885 | range_whole = true; | |
886 | dout(" not cyclic, %lu to %lu\n", index, end); | |
887 | } | |
888 | } else if (!ceph_wbc.head_snapc) { | |
889 | /* Do not respect wbc->range_{start,end}. Dirty pages | |
890 | * in that range can be associated with newer snapc. | |
891 | * They are not writeable until we write all dirty pages | |
892 | * associated with 'snapc' get written */ | |
1582af2e | 893 | if (index > 0) |
2a2d927e YZ |
894 | should_loop = true; |
895 | dout(" non-head snapc, range whole\n"); | |
1d3576fd | 896 | } |
2a2d927e YZ |
897 | |
898 | ceph_put_snap_context(last_snapc); | |
1d3576fd SW |
899 | last_snapc = snapc; |
900 | ||
af9cc401 | 901 | while (!done && index <= end) { |
5b64640c | 902 | int num_ops = 0, op_idx; |
0e5ecac7 | 903 | unsigned i, pvec_pages, max_pages, locked_pages = 0; |
5b64640c | 904 | struct page **pages = NULL, **data_pages; |
1d3576fd | 905 | struct page *page; |
0e5ecac7 | 906 | pgoff_t strip_unit_end = 0; |
5b64640c | 907 | u64 offset = 0, len = 0; |
a0102bda | 908 | bool from_pool = false; |
1d3576fd | 909 | |
0e5ecac7 | 910 | max_pages = wsize >> PAGE_SHIFT; |
1d3576fd SW |
911 | |
912 | get_more_pages: | |
2e169296 JL |
913 | pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, |
914 | end, PAGECACHE_TAG_DIRTY); | |
0ed75fc8 | 915 | dout("pagevec_lookup_range_tag got %d\n", pvec_pages); |
1d3576fd SW |
916 | if (!pvec_pages && !locked_pages) |
917 | break; | |
918 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
919 | page = pvec.pages[i]; | |
920 | dout("? %p idx %lu\n", page, page->index); | |
921 | if (locked_pages == 0) | |
922 | lock_page(page); /* first page */ | |
923 | else if (!trylock_page(page)) | |
924 | break; | |
925 | ||
926 | /* only dirty pages, or our accounting breaks */ | |
927 | if (unlikely(!PageDirty(page)) || | |
928 | unlikely(page->mapping != mapping)) { | |
929 | dout("!dirty or !mapping %p\n", page); | |
930 | unlock_page(page); | |
0713e5f2 | 931 | continue; |
1d3576fd | 932 | } |
af9cc401 YZ |
933 | /* only if matching snap context */ |
934 | pgsnapc = page_snap_context(page); | |
935 | if (pgsnapc != snapc) { | |
936 | dout("page snapc %p %lld != oldest %p %lld\n", | |
937 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); | |
1582af2e YZ |
938 | if (!should_loop && |
939 | !ceph_wbc.head_snapc && | |
940 | wbc->sync_mode != WB_SYNC_NONE) | |
941 | should_loop = true; | |
1d3576fd | 942 | unlock_page(page); |
af9cc401 | 943 | continue; |
1d3576fd | 944 | } |
1f934b00 YZ |
945 | if (page_offset(page) >= ceph_wbc.i_size) { |
946 | dout("%p page eof %llu\n", | |
947 | page, ceph_wbc.i_size); | |
c95f1c5f EC |
948 | if ((ceph_wbc.size_stable || |
949 | page_offset(page) >= i_size_read(inode)) && | |
950 | clear_page_dirty_for_io(page)) | |
af9cc401 YZ |
951 | mapping->a_ops->invalidatepage(page, |
952 | 0, PAGE_SIZE); | |
953 | unlock_page(page); | |
954 | continue; | |
955 | } | |
956 | if (strip_unit_end && (page->index > strip_unit_end)) { | |
957 | dout("end of strip unit %p\n", page); | |
1d3576fd SW |
958 | unlock_page(page); |
959 | break; | |
960 | } | |
961 | if (PageWriteback(page)) { | |
0713e5f2 YZ |
962 | if (wbc->sync_mode == WB_SYNC_NONE) { |
963 | dout("%p under writeback\n", page); | |
964 | unlock_page(page); | |
965 | continue; | |
966 | } | |
967 | dout("waiting on writeback %p\n", page); | |
968 | wait_on_page_writeback(page); | |
1d3576fd SW |
969 | } |
970 | ||
1d3576fd SW |
971 | if (!clear_page_dirty_for_io(page)) { |
972 | dout("%p !clear_page_dirty_for_io\n", page); | |
973 | unlock_page(page); | |
0713e5f2 | 974 | continue; |
1d3576fd SW |
975 | } |
976 | ||
e5975c7c AE |
977 | /* |
978 | * We have something to write. If this is | |
979 | * the first locked page this time through, | |
5b64640c YZ |
980 | * calculate max possinle write size and |
981 | * allocate a page array | |
e5975c7c | 982 | */ |
1d3576fd | 983 | if (locked_pages == 0) { |
5b64640c YZ |
984 | u64 objnum; |
985 | u64 objoff; | |
dccbf080 | 986 | u32 xlen; |
5b64640c | 987 | |
1d3576fd | 988 | /* prepare async write request */ |
e5975c7c | 989 | offset = (u64)page_offset(page); |
dccbf080 ID |
990 | ceph_calc_file_object_mapping(&ci->i_layout, |
991 | offset, wsize, | |
992 | &objnum, &objoff, | |
993 | &xlen); | |
994 | len = xlen; | |
8c71897b | 995 | |
3fb99d48 | 996 | num_ops = 1; |
5b64640c | 997 | strip_unit_end = page->index + |
09cbfeaf | 998 | ((len - 1) >> PAGE_SHIFT); |
88486957 | 999 | |
5b64640c | 1000 | BUG_ON(pages); |
88486957 | 1001 | max_pages = calc_pages_for(0, (u64)len); |
6da2ec56 KC |
1002 | pages = kmalloc_array(max_pages, |
1003 | sizeof(*pages), | |
1004 | GFP_NOFS); | |
88486957 | 1005 | if (!pages) { |
a0102bda JL |
1006 | from_pool = true; |
1007 | pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); | |
e5975c7c | 1008 | BUG_ON(!pages); |
88486957 | 1009 | } |
5b64640c YZ |
1010 | |
1011 | len = 0; | |
1012 | } else if (page->index != | |
09cbfeaf | 1013 | (offset + len) >> PAGE_SHIFT) { |
a0102bda JL |
1014 | if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS : |
1015 | CEPH_OSD_MAX_OPS)) { | |
5b64640c YZ |
1016 | redirty_page_for_writepage(wbc, page); |
1017 | unlock_page(page); | |
1018 | break; | |
1019 | } | |
1020 | ||
1021 | num_ops++; | |
1022 | offset = (u64)page_offset(page); | |
1023 | len = 0; | |
1d3576fd SW |
1024 | } |
1025 | ||
1026 | /* note position of first page in pvec */ | |
1d3576fd SW |
1027 | dout("%p will write page %p idx %lu\n", |
1028 | inode, page, page->index); | |
2baba250 | 1029 | |
5b64640c YZ |
1030 | if (atomic_long_inc_return(&fsc->writeback_count) > |
1031 | CONGESTION_ON_THRESH( | |
3d14c5d2 | 1032 | fsc->mount_options->congestion_kb)) { |
09dc9fc2 | 1033 | set_bdi_congested(inode_to_bdi(inode), |
213c99ee | 1034 | BLK_RW_ASYNC); |
2baba250 YS |
1035 | } |
1036 | ||
0713e5f2 YZ |
1037 | |
1038 | pages[locked_pages++] = page; | |
1039 | pvec.pages[i] = NULL; | |
1040 | ||
09cbfeaf | 1041 | len += PAGE_SIZE; |
1d3576fd SW |
1042 | } |
1043 | ||
1044 | /* did we get anything? */ | |
1045 | if (!locked_pages) | |
1046 | goto release_pvec_pages; | |
1047 | if (i) { | |
0713e5f2 YZ |
1048 | unsigned j, n = 0; |
1049 | /* shift unused page to beginning of pvec */ | |
1050 | for (j = 0; j < pvec_pages; j++) { | |
1051 | if (!pvec.pages[j]) | |
1052 | continue; | |
1053 | if (n < j) | |
1054 | pvec.pages[n] = pvec.pages[j]; | |
1055 | n++; | |
1056 | } | |
1057 | pvec.nr = n; | |
1d3576fd SW |
1058 | |
1059 | if (pvec_pages && i == pvec_pages && | |
1060 | locked_pages < max_pages) { | |
1061 | dout("reached end pvec, trying for more\n"); | |
0713e5f2 | 1062 | pagevec_release(&pvec); |
1d3576fd SW |
1063 | goto get_more_pages; |
1064 | } | |
1d3576fd SW |
1065 | } |
1066 | ||
5b64640c | 1067 | new_request: |
e5975c7c | 1068 | offset = page_offset(pages[0]); |
5b64640c YZ |
1069 | len = wsize; |
1070 | ||
1071 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1072 | &ci->i_layout, vino, | |
1073 | offset, &len, 0, num_ops, | |
1f934b00 YZ |
1074 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
1075 | snapc, ceph_wbc.truncate_seq, | |
1076 | ceph_wbc.truncate_size, false); | |
5b64640c YZ |
1077 | if (IS_ERR(req)) { |
1078 | req = ceph_osdc_new_request(&fsc->client->osdc, | |
1079 | &ci->i_layout, vino, | |
1080 | offset, &len, 0, | |
1081 | min(num_ops, | |
1082 | CEPH_OSD_SLAB_OPS), | |
1083 | CEPH_OSD_OP_WRITE, | |
54ea0046 | 1084 | CEPH_OSD_FLAG_WRITE, |
1f934b00 YZ |
1085 | snapc, ceph_wbc.truncate_seq, |
1086 | ceph_wbc.truncate_size, true); | |
5b64640c | 1087 | BUG_ON(IS_ERR(req)); |
e1966b49 | 1088 | } |
5b64640c | 1089 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
09cbfeaf | 1090 | PAGE_SIZE - offset); |
5b64640c YZ |
1091 | |
1092 | req->r_callback = writepages_finish; | |
1093 | req->r_inode = inode; | |
1d3576fd | 1094 | |
5b64640c YZ |
1095 | /* Format the osd request message and submit the write */ |
1096 | len = 0; | |
1097 | data_pages = pages; | |
1098 | op_idx = 0; | |
1099 | for (i = 0; i < locked_pages; i++) { | |
1100 | u64 cur_offset = page_offset(pages[i]); | |
1101 | if (offset + len != cur_offset) { | |
3fb99d48 | 1102 | if (op_idx + 1 == req->r_num_ops) |
5b64640c YZ |
1103 | break; |
1104 | osd_req_op_extent_dup_last(req, op_idx, | |
1105 | cur_offset - offset); | |
1106 | dout("writepages got pages at %llu~%llu\n", | |
1107 | offset, len); | |
1108 | osd_req_op_extent_osd_data_pages(req, op_idx, | |
1109 | data_pages, len, 0, | |
a0102bda | 1110 | from_pool, false); |
5b64640c | 1111 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1112 | |
5b64640c YZ |
1113 | len = 0; |
1114 | offset = cur_offset; | |
1115 | data_pages = pages + i; | |
1116 | op_idx++; | |
1117 | } | |
1118 | ||
1119 | set_page_writeback(pages[i]); | |
09cbfeaf | 1120 | len += PAGE_SIZE; |
5b64640c YZ |
1121 | } |
1122 | ||
1f934b00 YZ |
1123 | if (ceph_wbc.size_stable) { |
1124 | len = min(len, ceph_wbc.i_size - offset); | |
5b64640c YZ |
1125 | } else if (i == locked_pages) { |
1126 | /* writepages_finish() clears writeback pages | |
1127 | * according to the data length, so make sure | |
1128 | * data length covers all locked pages */ | |
09cbfeaf | 1129 | u64 min_len = len + 1 - PAGE_SIZE; |
1f934b00 YZ |
1130 | len = get_writepages_data_length(inode, pages[i - 1], |
1131 | offset); | |
5b64640c YZ |
1132 | len = max(len, min_len); |
1133 | } | |
1134 | dout("writepages got pages at %llu~%llu\n", offset, len); | |
e5975c7c | 1135 | |
5b64640c | 1136 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
a0102bda | 1137 | 0, from_pool, false); |
5b64640c | 1138 | osd_req_op_extent_update(req, op_idx, len); |
e5975c7c | 1139 | |
5b64640c YZ |
1140 | BUG_ON(op_idx + 1 != req->r_num_ops); |
1141 | ||
a0102bda | 1142 | from_pool = false; |
5b64640c YZ |
1143 | if (i < locked_pages) { |
1144 | BUG_ON(num_ops <= req->r_num_ops); | |
1145 | num_ops -= req->r_num_ops; | |
5b64640c YZ |
1146 | locked_pages -= i; |
1147 | ||
1148 | /* allocate new pages array for next request */ | |
1149 | data_pages = pages; | |
6da2ec56 KC |
1150 | pages = kmalloc_array(locked_pages, sizeof(*pages), |
1151 | GFP_NOFS); | |
5b64640c | 1152 | if (!pages) { |
a0102bda JL |
1153 | from_pool = true; |
1154 | pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); | |
5b64640c YZ |
1155 | BUG_ON(!pages); |
1156 | } | |
1157 | memcpy(pages, data_pages + i, | |
1158 | locked_pages * sizeof(*pages)); | |
1159 | memset(data_pages + i, 0, | |
1160 | locked_pages * sizeof(*pages)); | |
1161 | } else { | |
1162 | BUG_ON(num_ops != req->r_num_ops); | |
1163 | index = pages[i - 1]->index + 1; | |
1164 | /* request message now owns the pages array */ | |
1165 | pages = NULL; | |
1166 | } | |
e5975c7c | 1167 | |
fac02ddf | 1168 | req->r_mtime = inode->i_mtime; |
9d6fcb08 SW |
1169 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
1170 | BUG_ON(rc); | |
1d3576fd SW |
1171 | req = NULL; |
1172 | ||
5b64640c YZ |
1173 | wbc->nr_to_write -= i; |
1174 | if (pages) | |
1175 | goto new_request; | |
1176 | ||
2a2d927e YZ |
1177 | /* |
1178 | * We stop writing back only if we are not doing | |
1179 | * integrity sync. In case of integrity sync we have to | |
1180 | * keep going until we have written all the pages | |
1181 | * we tagged for writeback prior to entering this loop. | |
1182 | */ | |
1183 | if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) | |
af9cc401 | 1184 | done = true; |
1d3576fd SW |
1185 | |
1186 | release_pvec_pages: | |
1187 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
1188 | pvec.nr ? pvec.pages[0] : NULL); | |
1189 | pagevec_release(&pvec); | |
1d3576fd SW |
1190 | } |
1191 | ||
1192 | if (should_loop && !done) { | |
1193 | /* more to do; loop back to beginning of file */ | |
1194 | dout("writepages looping back to beginning of file\n"); | |
2a2d927e | 1195 | end = start_index - 1; /* OK even when start_index == 0 */ |
f275635e YZ |
1196 | |
1197 | /* to write dirty pages associated with next snapc, | |
1198 | * we need to wait until current writes complete */ | |
1199 | if (wbc->sync_mode != WB_SYNC_NONE && | |
1200 | start_index == 0 && /* all dirty pages were checked */ | |
1201 | !ceph_wbc.head_snapc) { | |
1202 | struct page *page; | |
1203 | unsigned i, nr; | |
1204 | index = 0; | |
1205 | while ((index <= end) && | |
1206 | (nr = pagevec_lookup_tag(&pvec, mapping, &index, | |
67fd707f | 1207 | PAGECACHE_TAG_WRITEBACK))) { |
f275635e YZ |
1208 | for (i = 0; i < nr; i++) { |
1209 | page = pvec.pages[i]; | |
1210 | if (page_snap_context(page) != snapc) | |
1211 | continue; | |
1212 | wait_on_page_writeback(page); | |
1213 | } | |
1214 | pagevec_release(&pvec); | |
1215 | cond_resched(); | |
1216 | } | |
1217 | } | |
1218 | ||
2a2d927e | 1219 | start_index = 0; |
1d3576fd SW |
1220 | index = 0; |
1221 | goto retry; | |
1222 | } | |
1223 | ||
1224 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
1225 | mapping->writeback_index = index; | |
1226 | ||
1227 | out: | |
3ed97d63 | 1228 | ceph_osdc_put_request(req); |
2a2d927e YZ |
1229 | ceph_put_snap_context(last_snapc); |
1230 | dout("writepages dend - startone, rc = %d\n", rc); | |
1d3576fd SW |
1231 | return rc; |
1232 | } | |
1233 | ||
1234 | ||
1235 | ||
1236 | /* | |
1237 | * See if a given @snapc is either writeable, or already written. | |
1238 | */ | |
1239 | static int context_is_writeable_or_written(struct inode *inode, | |
1240 | struct ceph_snap_context *snapc) | |
1241 | { | |
05455e11 | 1242 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); |
6298a337 SW |
1243 | int ret = !oldest || snapc->seq <= oldest->seq; |
1244 | ||
1245 | ceph_put_snap_context(oldest); | |
1246 | return ret; | |
1d3576fd SW |
1247 | } |
1248 | ||
18d620f0 JL |
1249 | /** |
1250 | * ceph_find_incompatible - find an incompatible context and return it | |
18d620f0 | 1251 | * @page: page being dirtied |
8f883c24 | 1252 | * |
18d620f0 JL |
1253 | * We are only allowed to write into/dirty a page if the page is |
1254 | * clean, or already dirty within the same snap context. Returns a | |
1255 | * conflicting context if there is one, NULL if there isn't, or a | |
1256 | * negative error code on other errors. | |
1257 | * | |
1258 | * Must be called with page lock held. | |
1d3576fd | 1259 | */ |
18d620f0 | 1260 | static struct ceph_snap_context * |
d45156bf | 1261 | ceph_find_incompatible(struct page *page) |
1d3576fd | 1262 | { |
d45156bf | 1263 | struct inode *inode = page->mapping->host; |
6c93df5d | 1264 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1d3576fd | 1265 | struct ceph_inode_info *ci = ceph_inode(inode); |
1d3576fd | 1266 | |
50c9132d | 1267 | if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { |
6c93df5d | 1268 | dout(" page %p forced umount\n", page); |
18d620f0 | 1269 | return ERR_PTR(-EIO); |
6c93df5d YZ |
1270 | } |
1271 | ||
18d620f0 JL |
1272 | for (;;) { |
1273 | struct ceph_snap_context *snapc, *oldest; | |
1274 | ||
1275 | wait_on_page_writeback(page); | |
1276 | ||
1277 | snapc = page_snap_context(page); | |
1278 | if (!snapc || snapc == ci->i_head_snapc) | |
1279 | break; | |
1d3576fd | 1280 | |
1d3576fd SW |
1281 | /* |
1282 | * this page is already dirty in another (older) snap | |
1283 | * context! is it writeable now? | |
1284 | */ | |
05455e11 | 1285 | oldest = get_oldest_context(inode, NULL, NULL); |
80e755fe | 1286 | if (snapc->seq > oldest->seq) { |
18d620f0 | 1287 | /* not writeable -- return it for the caller to deal with */ |
6298a337 | 1288 | ceph_put_snap_context(oldest); |
18d620f0 JL |
1289 | dout(" page %p snapc %p not current or oldest\n", page, snapc); |
1290 | return ceph_get_snap_context(snapc); | |
1d3576fd | 1291 | } |
6298a337 | 1292 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1293 | |
1294 | /* yay, writeable, do it now (without dropping page lock) */ | |
18d620f0 JL |
1295 | dout(" page %p snapc %p not current, but oldest\n", page, snapc); |
1296 | if (clear_page_dirty_for_io(page)) { | |
1297 | int r = writepage_nounlock(page, NULL); | |
1298 | if (r < 0) | |
1299 | return ERR_PTR(r); | |
1300 | } | |
1301 | } | |
1302 | return NULL; | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * We are only allowed to write into/dirty the page if the page is | |
1307 | * clean, or already dirty within the same snap context. | |
18d620f0 | 1308 | */ |
1cc16990 JL |
1309 | static int ceph_write_begin(struct file *file, struct address_space *mapping, |
1310 | loff_t pos, unsigned len, unsigned flags, | |
1311 | struct page **pagep, void **fsdata) | |
18d620f0 JL |
1312 | { |
1313 | struct inode *inode = file_inode(file); | |
1314 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1315 | struct ceph_snap_context *snapc; | |
1cc16990 JL |
1316 | struct page *page = NULL; |
1317 | pgoff_t index = pos >> PAGE_SHIFT; | |
18d620f0 | 1318 | int pos_in_page = pos & ~PAGE_MASK; |
1cc16990 | 1319 | int r = 0; |
1d3576fd | 1320 | |
1cc16990 | 1321 | dout("write_begin file %p inode %p page %p %d~%d\n", file, inode, page, (int)pos, (int)len); |
1d3576fd | 1322 | |
1cc16990 | 1323 | for (;;) { |
4a357f50 | 1324 | page = grab_cache_page_write_begin(mapping, index, flags); |
1cc16990 JL |
1325 | if (!page) { |
1326 | r = -ENOMEM; | |
1327 | break; | |
1328 | } | |
1d3576fd | 1329 | |
1cc16990 JL |
1330 | snapc = ceph_find_incompatible(page); |
1331 | if (snapc) { | |
1332 | if (IS_ERR(snapc)) { | |
1333 | r = PTR_ERR(snapc); | |
1334 | break; | |
1335 | } | |
1336 | unlock_page(page); | |
1337 | put_page(page); | |
1338 | page = NULL; | |
1339 | ceph_queue_writeback(inode); | |
1340 | r = wait_event_killable(ci->i_cap_wq, | |
1341 | context_is_writeable_or_written(inode, snapc)); | |
1342 | ceph_put_snap_context(snapc); | |
1343 | if (r != 0) | |
1344 | break; | |
1345 | continue; | |
1346 | } | |
1d3576fd | 1347 | |
1cc16990 JL |
1348 | if (PageUptodate(page)) { |
1349 | dout(" page %p already uptodate\n", page); | |
1350 | break; | |
1351 | } | |
4af6b225 | 1352 | |
1cc16990 JL |
1353 | /* |
1354 | * In some cases we don't need to read at all: | |
1355 | * - full page write | |
1356 | * - write that lies completely beyond EOF | |
1357 | * - write that covers the the page from start to EOF or beyond it | |
1358 | */ | |
1359 | if ((pos_in_page == 0 && len == PAGE_SIZE) || | |
1360 | (pos >= i_size_read(inode)) || | |
1361 | (pos_in_page == 0 && (pos + len) >= i_size_read(inode))) { | |
1362 | zero_user_segments(page, 0, pos_in_page, | |
1363 | pos_in_page + len, PAGE_SIZE); | |
1364 | break; | |
1365 | } | |
4af6b225 | 1366 | |
1cc16990 JL |
1367 | /* |
1368 | * We need to read it. If we get back -EINPROGRESS, then the page was | |
1369 | * handed off to fscache and it will be unlocked when the read completes. | |
1370 | * Refind the page in that case so we can reacquire the page lock. Otherwise | |
1371 | * we got a hard error or the read was completed synchronously. | |
1372 | */ | |
1373 | r = ceph_do_readpage(file, page); | |
1374 | if (r != -EINPROGRESS) | |
1375 | break; | |
1376 | } | |
4af6b225 | 1377 | |
1cc16990 JL |
1378 | if (r < 0) { |
1379 | if (page) { | |
1380 | unlock_page(page); | |
09cbfeaf | 1381 | put_page(page); |
1cc16990 JL |
1382 | } |
1383 | } else { | |
1384 | *pagep = page; | |
1385 | } | |
4af6b225 YS |
1386 | return r; |
1387 | } | |
1388 | ||
1d3576fd SW |
1389 | /* |
1390 | * we don't do anything in here that simple_write_end doesn't do | |
5dda377c | 1391 | * except adjust dirty page accounting |
1d3576fd SW |
1392 | */ |
1393 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1394 | loff_t pos, unsigned len, unsigned copied, | |
1395 | struct page *page, void *fsdata) | |
1396 | { | |
496ad9aa | 1397 | struct inode *inode = file_inode(file); |
efb0ca76 | 1398 | bool check_cap = false; |
1d3576fd SW |
1399 | |
1400 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1401 | inode, page, (int)pos, (int)copied, (int)len); | |
1402 | ||
1403 | /* zero the stale part of the page if we did a short copy */ | |
b9de313c AV |
1404 | if (!PageUptodate(page)) { |
1405 | if (copied < len) { | |
1406 | copied = 0; | |
1407 | goto out; | |
1408 | } | |
1409 | SetPageUptodate(page); | |
1410 | } | |
1d3576fd SW |
1411 | |
1412 | /* did file size increase? */ | |
99c88e69 | 1413 | if (pos+copied > i_size_read(inode)) |
1d3576fd SW |
1414 | check_cap = ceph_inode_set_size(inode, pos+copied); |
1415 | ||
1d3576fd SW |
1416 | set_page_dirty(page); |
1417 | ||
b9de313c | 1418 | out: |
1d3576fd | 1419 | unlock_page(page); |
09cbfeaf | 1420 | put_page(page); |
1d3576fd SW |
1421 | |
1422 | if (check_cap) | |
1423 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1424 | ||
1425 | return copied; | |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * we set .direct_IO to indicate direct io is supported, but since we | |
1430 | * intercept O_DIRECT reads and writes early, this function should | |
1431 | * never get called. | |
1432 | */ | |
c8b8e32d | 1433 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
1d3576fd SW |
1434 | { |
1435 | WARN_ON(1); | |
1436 | return -EINVAL; | |
1437 | } | |
1438 | ||
1439 | const struct address_space_operations ceph_aops = { | |
1440 | .readpage = ceph_readpage, | |
1441 | .readpages = ceph_readpages, | |
1442 | .writepage = ceph_writepage, | |
1443 | .writepages = ceph_writepages_start, | |
1444 | .write_begin = ceph_write_begin, | |
1445 | .write_end = ceph_write_end, | |
1446 | .set_page_dirty = ceph_set_page_dirty, | |
1447 | .invalidatepage = ceph_invalidatepage, | |
1448 | .releasepage = ceph_releasepage, | |
1449 | .direct_IO = ceph_direct_io, | |
1450 | }; | |
1451 | ||
4f7e89f6 YZ |
1452 | static void ceph_block_sigs(sigset_t *oldset) |
1453 | { | |
1454 | sigset_t mask; | |
1455 | siginitsetinv(&mask, sigmask(SIGKILL)); | |
1456 | sigprocmask(SIG_BLOCK, &mask, oldset); | |
1457 | } | |
1458 | ||
1459 | static void ceph_restore_sigs(sigset_t *oldset) | |
1460 | { | |
1461 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
1462 | } | |
1d3576fd SW |
1463 | |
1464 | /* | |
1465 | * vm ops | |
1466 | */ | |
24499847 | 1467 | static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) |
61f68816 | 1468 | { |
11bac800 | 1469 | struct vm_area_struct *vma = vmf->vma; |
61f68816 YZ |
1470 | struct inode *inode = file_inode(vma->vm_file); |
1471 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1472 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1473 | struct page *pinned_page = NULL; |
c403c3a2 | 1474 | loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT; |
24499847 | 1475 | int want, got, err; |
4f7e89f6 | 1476 | sigset_t oldset; |
24499847 | 1477 | vm_fault_t ret = VM_FAULT_SIGBUS; |
4f7e89f6 YZ |
1478 | |
1479 | ceph_block_sigs(&oldset); | |
61f68816 YZ |
1480 | |
1481 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
09cbfeaf | 1482 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
61f68816 YZ |
1483 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1484 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1485 | else | |
1486 | want = CEPH_CAP_FILE_CACHE; | |
4f7e89f6 YZ |
1487 | |
1488 | got = 0; | |
5e3ded1b YZ |
1489 | err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, |
1490 | &got, &pinned_page); | |
24499847 | 1491 | if (err < 0) |
4f7e89f6 | 1492 | goto out_restore; |
6ce026e4 | 1493 | |
61f68816 | 1494 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
09cbfeaf | 1495 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
61f68816 | 1496 | |
83701246 | 1497 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
2b1ac852 | 1498 | ci->i_inline_version == CEPH_INLINE_NONE) { |
5d988308 YZ |
1499 | CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); |
1500 | ceph_add_rw_context(fi, &rw_ctx); | |
11bac800 | 1501 | ret = filemap_fault(vmf); |
5d988308 | 1502 | ceph_del_rw_context(fi, &rw_ctx); |
24499847 SJ |
1503 | dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", |
1504 | inode, off, (size_t)PAGE_SIZE, | |
1505 | ceph_cap_string(got), ret); | |
2b1ac852 | 1506 | } else |
24499847 | 1507 | err = -EAGAIN; |
61f68816 | 1508 | |
3738daa6 | 1509 | if (pinned_page) |
09cbfeaf | 1510 | put_page(pinned_page); |
61f68816 YZ |
1511 | ceph_put_cap_refs(ci, got); |
1512 | ||
24499847 | 1513 | if (err != -EAGAIN) |
4f7e89f6 | 1514 | goto out_restore; |
83701246 YZ |
1515 | |
1516 | /* read inline data */ | |
09cbfeaf | 1517 | if (off >= PAGE_SIZE) { |
83701246 YZ |
1518 | /* does not support inline data > PAGE_SIZE */ |
1519 | ret = VM_FAULT_SIGBUS; | |
1520 | } else { | |
83701246 YZ |
1521 | struct address_space *mapping = inode->i_mapping; |
1522 | struct page *page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1523 | mapping_gfp_constraint(mapping, |
1524 | ~__GFP_FS)); | |
83701246 YZ |
1525 | if (!page) { |
1526 | ret = VM_FAULT_OOM; | |
4f7e89f6 | 1527 | goto out_inline; |
83701246 | 1528 | } |
24499847 | 1529 | err = __ceph_do_getattr(inode, page, |
83701246 | 1530 | CEPH_STAT_CAP_INLINE_DATA, true); |
24499847 | 1531 | if (err < 0 || off >= i_size_read(inode)) { |
83701246 | 1532 | unlock_page(page); |
09cbfeaf | 1533 | put_page(page); |
c64a2b05 | 1534 | ret = vmf_error(err); |
4f7e89f6 | 1535 | goto out_inline; |
83701246 | 1536 | } |
24499847 SJ |
1537 | if (err < PAGE_SIZE) |
1538 | zero_user_segment(page, err, PAGE_SIZE); | |
83701246 YZ |
1539 | else |
1540 | flush_dcache_page(page); | |
1541 | SetPageUptodate(page); | |
1542 | vmf->page = page; | |
1543 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
4f7e89f6 | 1544 | out_inline: |
24499847 | 1545 | dout("filemap_fault %p %llu~%zd read inline data ret %x\n", |
4f7e89f6 | 1546 | inode, off, (size_t)PAGE_SIZE, ret); |
83701246 | 1547 | } |
4f7e89f6 YZ |
1548 | out_restore: |
1549 | ceph_restore_sigs(&oldset); | |
24499847 SJ |
1550 | if (err < 0) |
1551 | ret = vmf_error(err); | |
6ce026e4 | 1552 | |
61f68816 YZ |
1553 | return ret; |
1554 | } | |
1d3576fd SW |
1555 | |
1556 | /* | |
1557 | * Reuse write_begin here for simplicity. | |
1558 | */ | |
24499847 | 1559 | static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) |
1d3576fd | 1560 | { |
11bac800 | 1561 | struct vm_area_struct *vma = vmf->vma; |
496ad9aa | 1562 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1563 | struct ceph_inode_info *ci = ceph_inode(inode); |
1564 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
f66fd9f0 | 1565 | struct ceph_cap_flush *prealloc_cf; |
61f68816 | 1566 | struct page *page = vmf->page; |
6285bc23 | 1567 | loff_t off = page_offset(page); |
61f68816 YZ |
1568 | loff_t size = i_size_read(inode); |
1569 | size_t len; | |
24499847 | 1570 | int want, got, err; |
4f7e89f6 | 1571 | sigset_t oldset; |
24499847 | 1572 | vm_fault_t ret = VM_FAULT_SIGBUS; |
3ca9c3bd | 1573 | |
f66fd9f0 YZ |
1574 | prealloc_cf = ceph_alloc_cap_flush(); |
1575 | if (!prealloc_cf) | |
6ce026e4 | 1576 | return VM_FAULT_OOM; |
f66fd9f0 | 1577 | |
249c1df5 | 1578 | sb_start_pagefault(inode->i_sb); |
4f7e89f6 | 1579 | ceph_block_sigs(&oldset); |
f66fd9f0 | 1580 | |
28127bdd YZ |
1581 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1582 | struct page *locked_page = NULL; | |
1583 | if (off == 0) { | |
1584 | lock_page(page); | |
1585 | locked_page = page; | |
1586 | } | |
24499847 | 1587 | err = ceph_uninline_data(vma->vm_file, locked_page); |
28127bdd YZ |
1588 | if (locked_page) |
1589 | unlock_page(locked_page); | |
24499847 | 1590 | if (err < 0) |
f66fd9f0 | 1591 | goto out_free; |
28127bdd YZ |
1592 | } |
1593 | ||
09cbfeaf KS |
1594 | if (off + PAGE_SIZE <= size) |
1595 | len = PAGE_SIZE; | |
1d3576fd | 1596 | else |
09cbfeaf | 1597 | len = size & ~PAGE_MASK; |
1d3576fd | 1598 | |
61f68816 YZ |
1599 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1600 | inode, ceph_vinop(inode), off, len, size); | |
1601 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1602 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1603 | else | |
1604 | want = CEPH_CAP_FILE_BUFFER; | |
4f7e89f6 YZ |
1605 | |
1606 | got = 0; | |
5e3ded1b | 1607 | err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, |
4f7e89f6 | 1608 | &got, NULL); |
24499847 | 1609 | if (err < 0) |
4f7e89f6 | 1610 | goto out_free; |
6ce026e4 | 1611 | |
61f68816 YZ |
1612 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
1613 | inode, off, len, ceph_cap_string(got)); | |
1614 | ||
1615 | /* Update time before taking page lock */ | |
1616 | file_update_time(vma->vm_file); | |
5c308356 | 1617 | inode_inc_iversion_raw(inode); |
4af6b225 | 1618 | |
f0b33df5 | 1619 | do { |
d45156bf JL |
1620 | struct ceph_snap_context *snapc; |
1621 | ||
f0b33df5 | 1622 | lock_page(page); |
4af6b225 | 1623 | |
cb03c143 | 1624 | if (page_mkwrite_check_truncate(page, inode) < 0) { |
f0b33df5 YZ |
1625 | unlock_page(page); |
1626 | ret = VM_FAULT_NOPAGE; | |
1627 | break; | |
1628 | } | |
1629 | ||
d45156bf JL |
1630 | snapc = ceph_find_incompatible(page); |
1631 | if (!snapc) { | |
f0b33df5 YZ |
1632 | /* success. we'll keep the page locked. */ |
1633 | set_page_dirty(page); | |
1634 | ret = VM_FAULT_LOCKED; | |
d45156bf JL |
1635 | break; |
1636 | } | |
1637 | ||
1638 | unlock_page(page); | |
1639 | ||
1640 | if (IS_ERR(snapc)) { | |
1641 | ret = VM_FAULT_SIGBUS; | |
1642 | break; | |
f0b33df5 | 1643 | } |
d45156bf JL |
1644 | |
1645 | ceph_queue_writeback(inode); | |
1646 | err = wait_event_killable(ci->i_cap_wq, | |
1647 | context_is_writeable_or_written(inode, snapc)); | |
1648 | ceph_put_snap_context(snapc); | |
1649 | } while (err == 0); | |
4af6b225 | 1650 | |
28127bdd YZ |
1651 | if (ret == VM_FAULT_LOCKED || |
1652 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1653 | int dirty; |
1654 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1655 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1656 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1657 | &prealloc_cf); | |
61f68816 YZ |
1658 | spin_unlock(&ci->i_ceph_lock); |
1659 | if (dirty) | |
1660 | __mark_inode_dirty(inode, dirty); | |
1661 | } | |
1662 | ||
24499847 | 1663 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", |
61f68816 YZ |
1664 | inode, off, len, ceph_cap_string(got), ret); |
1665 | ceph_put_cap_refs(ci, got); | |
f66fd9f0 | 1666 | out_free: |
4f7e89f6 | 1667 | ceph_restore_sigs(&oldset); |
249c1df5 | 1668 | sb_end_pagefault(inode->i_sb); |
f66fd9f0 | 1669 | ceph_free_cap_flush(prealloc_cf); |
24499847 SJ |
1670 | if (err < 0) |
1671 | ret = vmf_error(err); | |
1d3576fd SW |
1672 | return ret; |
1673 | } | |
1674 | ||
31c542a1 YZ |
1675 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1676 | char *data, size_t len) | |
1677 | { | |
1678 | struct address_space *mapping = inode->i_mapping; | |
1679 | struct page *page; | |
1680 | ||
1681 | if (locked_page) { | |
1682 | page = locked_page; | |
1683 | } else { | |
1684 | if (i_size_read(inode) == 0) | |
1685 | return; | |
1686 | page = find_or_create_page(mapping, 0, | |
c62d2555 MH |
1687 | mapping_gfp_constraint(mapping, |
1688 | ~__GFP_FS)); | |
31c542a1 YZ |
1689 | if (!page) |
1690 | return; | |
1691 | if (PageUptodate(page)) { | |
1692 | unlock_page(page); | |
09cbfeaf | 1693 | put_page(page); |
31c542a1 YZ |
1694 | return; |
1695 | } | |
1696 | } | |
1697 | ||
0668ff52 | 1698 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1699 | inode, ceph_vinop(inode), len, locked_page); |
1700 | ||
1701 | if (len > 0) { | |
1702 | void *kaddr = kmap_atomic(page); | |
1703 | memcpy(kaddr, data, len); | |
1704 | kunmap_atomic(kaddr); | |
1705 | } | |
1706 | ||
1707 | if (page != locked_page) { | |
09cbfeaf KS |
1708 | if (len < PAGE_SIZE) |
1709 | zero_user_segment(page, len, PAGE_SIZE); | |
31c542a1 YZ |
1710 | else |
1711 | flush_dcache_page(page); | |
1712 | ||
1713 | SetPageUptodate(page); | |
1714 | unlock_page(page); | |
09cbfeaf | 1715 | put_page(page); |
31c542a1 YZ |
1716 | } |
1717 | } | |
1718 | ||
28127bdd YZ |
1719 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1720 | { | |
1721 | struct inode *inode = file_inode(filp); | |
1722 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1723 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1724 | struct ceph_osd_request *req; | |
1725 | struct page *page = NULL; | |
1726 | u64 len, inline_version; | |
1727 | int err = 0; | |
1728 | bool from_pagecache = false; | |
1729 | ||
1730 | spin_lock(&ci->i_ceph_lock); | |
1731 | inline_version = ci->i_inline_version; | |
1732 | spin_unlock(&ci->i_ceph_lock); | |
1733 | ||
1734 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1735 | inode, ceph_vinop(inode), inline_version); | |
1736 | ||
1737 | if (inline_version == 1 || /* initial version, no data */ | |
1738 | inline_version == CEPH_INLINE_NONE) | |
1739 | goto out; | |
1740 | ||
1741 | if (locked_page) { | |
1742 | page = locked_page; | |
1743 | WARN_ON(!PageUptodate(page)); | |
1744 | } else if (ceph_caps_issued(ci) & | |
1745 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1746 | page = find_get_page(inode->i_mapping, 0); | |
1747 | if (page) { | |
1748 | if (PageUptodate(page)) { | |
1749 | from_pagecache = true; | |
1750 | lock_page(page); | |
1751 | } else { | |
09cbfeaf | 1752 | put_page(page); |
28127bdd YZ |
1753 | page = NULL; |
1754 | } | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | if (page) { | |
1759 | len = i_size_read(inode); | |
09cbfeaf KS |
1760 | if (len > PAGE_SIZE) |
1761 | len = PAGE_SIZE; | |
28127bdd YZ |
1762 | } else { |
1763 | page = __page_cache_alloc(GFP_NOFS); | |
1764 | if (!page) { | |
1765 | err = -ENOMEM; | |
1766 | goto out; | |
1767 | } | |
1768 | err = __ceph_do_getattr(inode, page, | |
1769 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1770 | if (err < 0) { | |
1771 | /* no inline data */ | |
1772 | if (err == -ENODATA) | |
1773 | err = 0; | |
1774 | goto out; | |
1775 | } | |
1776 | len = err; | |
1777 | } | |
1778 | ||
1779 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1780 | ceph_vino(inode), 0, &len, 0, 1, | |
54ea0046 | 1781 | CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, |
34b759b4 | 1782 | NULL, 0, 0, false); |
28127bdd YZ |
1783 | if (IS_ERR(req)) { |
1784 | err = PTR_ERR(req); | |
1785 | goto out; | |
1786 | } | |
1787 | ||
fac02ddf | 1788 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1789 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1790 | if (!err) | |
1791 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1792 | ceph_osdc_put_request(req); | |
1793 | if (err < 0) | |
1794 | goto out; | |
1795 | ||
1796 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1797 | ceph_vino(inode), 0, &len, 1, 3, | |
54ea0046 | 1798 | CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, |
34b759b4 ID |
1799 | NULL, ci->i_truncate_seq, |
1800 | ci->i_truncate_size, false); | |
28127bdd YZ |
1801 | if (IS_ERR(req)) { |
1802 | err = PTR_ERR(req); | |
1803 | goto out; | |
1804 | } | |
1805 | ||
1806 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1807 | ||
ec137c10 YZ |
1808 | { |
1809 | __le64 xattr_buf = cpu_to_le64(inline_version); | |
1810 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1811 | "inline_version", &xattr_buf, | |
1812 | sizeof(xattr_buf), | |
1813 | CEPH_OSD_CMPXATTR_OP_GT, | |
1814 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1815 | if (err) | |
1816 | goto out_put; | |
1817 | } | |
1818 | ||
1819 | { | |
1820 | char xattr_buf[32]; | |
1821 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), | |
1822 | "%llu", inline_version); | |
1823 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1824 | "inline_version", | |
1825 | xattr_buf, xattr_len, 0, 0); | |
1826 | if (err) | |
1827 | goto out_put; | |
1828 | } | |
28127bdd | 1829 | |
fac02ddf | 1830 | req->r_mtime = inode->i_mtime; |
28127bdd YZ |
1831 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1832 | if (!err) | |
1833 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
97e27aaa XL |
1834 | |
1835 | ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, | |
1836 | req->r_end_latency, err); | |
1837 | ||
28127bdd YZ |
1838 | out_put: |
1839 | ceph_osdc_put_request(req); | |
1840 | if (err == -ECANCELED) | |
1841 | err = 0; | |
1842 | out: | |
1843 | if (page && page != locked_page) { | |
1844 | if (from_pagecache) { | |
1845 | unlock_page(page); | |
09cbfeaf | 1846 | put_page(page); |
28127bdd YZ |
1847 | } else |
1848 | __free_pages(page, 0); | |
1849 | } | |
1850 | ||
1851 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1852 | inode, ceph_vinop(inode), inline_version, err); | |
1853 | return err; | |
1854 | } | |
1855 | ||
7cbea8dc | 1856 | static const struct vm_operations_struct ceph_vmops = { |
61f68816 | 1857 | .fault = ceph_filemap_fault, |
1d3576fd SW |
1858 | .page_mkwrite = ceph_page_mkwrite, |
1859 | }; | |
1860 | ||
1861 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1862 | { | |
1863 | struct address_space *mapping = file->f_mapping; | |
1864 | ||
1865 | if (!mapping->a_ops->readpage) | |
1866 | return -ENOEXEC; | |
1867 | file_accessed(file); | |
1868 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1869 | return 0; |
1870 | } | |
10183a69 YZ |
1871 | |
1872 | enum { | |
1873 | POOL_READ = 1, | |
1874 | POOL_WRITE = 2, | |
1875 | }; | |
1876 | ||
779fe0fb YZ |
1877 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
1878 | s64 pool, struct ceph_string *pool_ns) | |
10183a69 YZ |
1879 | { |
1880 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1881 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1882 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; | |
1883 | struct rb_node **p, *parent; | |
1884 | struct ceph_pool_perm *perm; | |
1885 | struct page **pages; | |
779fe0fb | 1886 | size_t pool_ns_len; |
10183a69 YZ |
1887 | int err = 0, err2 = 0, have = 0; |
1888 | ||
1889 | down_read(&mdsc->pool_perm_rwsem); | |
1890 | p = &mdsc->pool_perm_tree.rb_node; | |
1891 | while (*p) { | |
1892 | perm = rb_entry(*p, struct ceph_pool_perm, node); | |
1893 | if (pool < perm->pool) | |
1894 | p = &(*p)->rb_left; | |
1895 | else if (pool > perm->pool) | |
1896 | p = &(*p)->rb_right; | |
1897 | else { | |
779fe0fb YZ |
1898 | int ret = ceph_compare_string(pool_ns, |
1899 | perm->pool_ns, | |
1900 | perm->pool_ns_len); | |
1901 | if (ret < 0) | |
1902 | p = &(*p)->rb_left; | |
1903 | else if (ret > 0) | |
1904 | p = &(*p)->rb_right; | |
1905 | else { | |
1906 | have = perm->perm; | |
1907 | break; | |
1908 | } | |
10183a69 YZ |
1909 | } |
1910 | } | |
1911 | up_read(&mdsc->pool_perm_rwsem); | |
1912 | if (*p) | |
1913 | goto out; | |
1914 | ||
779fe0fb YZ |
1915 | if (pool_ns) |
1916 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", | |
1917 | pool, (int)pool_ns->len, pool_ns->str); | |
1918 | else | |
1919 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); | |
10183a69 YZ |
1920 | |
1921 | down_write(&mdsc->pool_perm_rwsem); | |
779fe0fb | 1922 | p = &mdsc->pool_perm_tree.rb_node; |
10183a69 YZ |
1923 | parent = NULL; |
1924 | while (*p) { | |
1925 | parent = *p; | |
1926 | perm = rb_entry(parent, struct ceph_pool_perm, node); | |
1927 | if (pool < perm->pool) | |
1928 | p = &(*p)->rb_left; | |
1929 | else if (pool > perm->pool) | |
1930 | p = &(*p)->rb_right; | |
1931 | else { | |
779fe0fb YZ |
1932 | int ret = ceph_compare_string(pool_ns, |
1933 | perm->pool_ns, | |
1934 | perm->pool_ns_len); | |
1935 | if (ret < 0) | |
1936 | p = &(*p)->rb_left; | |
1937 | else if (ret > 0) | |
1938 | p = &(*p)->rb_right; | |
1939 | else { | |
1940 | have = perm->perm; | |
1941 | break; | |
1942 | } | |
10183a69 YZ |
1943 | } |
1944 | } | |
1945 | if (*p) { | |
1946 | up_write(&mdsc->pool_perm_rwsem); | |
1947 | goto out; | |
1948 | } | |
1949 | ||
34b759b4 | 1950 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1951 | 1, false, GFP_NOFS); |
1952 | if (!rd_req) { | |
1953 | err = -ENOMEM; | |
1954 | goto out_unlock; | |
1955 | } | |
1956 | ||
1957 | rd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1958 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); | |
1959 | rd_req->r_base_oloc.pool = pool; | |
779fe0fb YZ |
1960 | if (pool_ns) |
1961 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); | |
d30291b9 | 1962 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
10183a69 | 1963 | |
13d1ad16 ID |
1964 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
1965 | if (err) | |
1966 | goto out_unlock; | |
10183a69 | 1967 | |
34b759b4 | 1968 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
10183a69 YZ |
1969 | 1, false, GFP_NOFS); |
1970 | if (!wr_req) { | |
1971 | err = -ENOMEM; | |
1972 | goto out_unlock; | |
1973 | } | |
1974 | ||
54ea0046 | 1975 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE; |
10183a69 | 1976 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
63244fa1 | 1977 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
d30291b9 | 1978 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
10183a69 | 1979 | |
13d1ad16 ID |
1980 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
1981 | if (err) | |
1982 | goto out_unlock; | |
10183a69 YZ |
1983 | |
1984 | /* one page should be large enough for STAT data */ | |
1985 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); | |
1986 | if (IS_ERR(pages)) { | |
1987 | err = PTR_ERR(pages); | |
1988 | goto out_unlock; | |
1989 | } | |
1990 | ||
1991 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, | |
1992 | 0, false, true); | |
10183a69 YZ |
1993 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
1994 | ||
fac02ddf | 1995 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
10183a69 YZ |
1996 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
1997 | ||
1998 | if (!err) | |
1999 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); | |
2000 | if (!err2) | |
2001 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); | |
2002 | ||
2003 | if (err >= 0 || err == -ENOENT) | |
2004 | have |= POOL_READ; | |
131d7eb4 | 2005 | else if (err != -EPERM) { |
0b98acd6 ID |
2006 | if (err == -EBLOCKLISTED) |
2007 | fsc->blocklisted = true; | |
10183a69 | 2008 | goto out_unlock; |
131d7eb4 | 2009 | } |
10183a69 YZ |
2010 | |
2011 | if (err2 == 0 || err2 == -EEXIST) | |
2012 | have |= POOL_WRITE; | |
2013 | else if (err2 != -EPERM) { | |
0b98acd6 ID |
2014 | if (err2 == -EBLOCKLISTED) |
2015 | fsc->blocklisted = true; | |
10183a69 YZ |
2016 | err = err2; |
2017 | goto out_unlock; | |
2018 | } | |
2019 | ||
779fe0fb YZ |
2020 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
2021 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); | |
10183a69 YZ |
2022 | if (!perm) { |
2023 | err = -ENOMEM; | |
2024 | goto out_unlock; | |
2025 | } | |
2026 | ||
2027 | perm->pool = pool; | |
2028 | perm->perm = have; | |
779fe0fb YZ |
2029 | perm->pool_ns_len = pool_ns_len; |
2030 | if (pool_ns_len > 0) | |
2031 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); | |
2032 | perm->pool_ns[pool_ns_len] = 0; | |
2033 | ||
10183a69 YZ |
2034 | rb_link_node(&perm->node, parent, p); |
2035 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); | |
2036 | err = 0; | |
2037 | out_unlock: | |
2038 | up_write(&mdsc->pool_perm_rwsem); | |
2039 | ||
3ed97d63 ID |
2040 | ceph_osdc_put_request(rd_req); |
2041 | ceph_osdc_put_request(wr_req); | |
10183a69 YZ |
2042 | out: |
2043 | if (!err) | |
2044 | err = have; | |
779fe0fb YZ |
2045 | if (pool_ns) |
2046 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", | |
2047 | pool, (int)pool_ns->len, pool_ns->str, err); | |
2048 | else | |
2049 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); | |
10183a69 YZ |
2050 | return err; |
2051 | } | |
2052 | ||
5e3ded1b | 2053 | int ceph_pool_perm_check(struct inode *inode, int need) |
10183a69 | 2054 | { |
5e3ded1b | 2055 | struct ceph_inode_info *ci = ceph_inode(inode); |
779fe0fb | 2056 | struct ceph_string *pool_ns; |
5e3ded1b | 2057 | s64 pool; |
10183a69 YZ |
2058 | int ret, flags; |
2059 | ||
80e80fbb YZ |
2060 | if (ci->i_vino.snap != CEPH_NOSNAP) { |
2061 | /* | |
2062 | * Pool permission check needs to write to the first object. | |
2063 | * But for snapshot, head of the first object may have alread | |
2064 | * been deleted. Skip check to avoid creating orphan object. | |
2065 | */ | |
2066 | return 0; | |
2067 | } | |
2068 | ||
5e3ded1b | 2069 | if (ceph_test_mount_opt(ceph_inode_to_client(inode), |
10183a69 YZ |
2070 | NOPOOLPERM)) |
2071 | return 0; | |
2072 | ||
2073 | spin_lock(&ci->i_ceph_lock); | |
2074 | flags = ci->i_ceph_flags; | |
7627151e | 2075 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2076 | spin_unlock(&ci->i_ceph_lock); |
2077 | check: | |
2078 | if (flags & CEPH_I_POOL_PERM) { | |
2079 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { | |
7627151e | 2080 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
10183a69 YZ |
2081 | pool); |
2082 | return -EPERM; | |
2083 | } | |
2084 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { | |
7627151e | 2085 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
10183a69 YZ |
2086 | pool); |
2087 | return -EPERM; | |
2088 | } | |
2089 | return 0; | |
2090 | } | |
2091 | ||
779fe0fb YZ |
2092 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
2093 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); | |
2094 | ceph_put_string(pool_ns); | |
10183a69 YZ |
2095 | if (ret < 0) |
2096 | return ret; | |
2097 | ||
2098 | flags = CEPH_I_POOL_PERM; | |
2099 | if (ret & POOL_READ) | |
2100 | flags |= CEPH_I_POOL_RD; | |
2101 | if (ret & POOL_WRITE) | |
2102 | flags |= CEPH_I_POOL_WR; | |
2103 | ||
2104 | spin_lock(&ci->i_ceph_lock); | |
779fe0fb YZ |
2105 | if (pool == ci->i_layout.pool_id && |
2106 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { | |
2107 | ci->i_ceph_flags |= flags; | |
10183a69 | 2108 | } else { |
7627151e | 2109 | pool = ci->i_layout.pool_id; |
10183a69 YZ |
2110 | flags = ci->i_ceph_flags; |
2111 | } | |
2112 | spin_unlock(&ci->i_ceph_lock); | |
2113 | goto check; | |
2114 | } | |
2115 | ||
2116 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) | |
2117 | { | |
2118 | struct ceph_pool_perm *perm; | |
2119 | struct rb_node *n; | |
2120 | ||
2121 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { | |
2122 | n = rb_first(&mdsc->pool_perm_tree); | |
2123 | perm = rb_entry(n, struct ceph_pool_perm, node); | |
2124 | rb_erase(n, &mdsc->pool_perm_tree); | |
2125 | kfree(perm); | |
2126 | } | |
2127 | } |