Commit | Line | Data |
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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 | ||
90 | /* | |
91 | * Note that we're grabbing a snapc ref here without holding | |
92 | * any locks! | |
93 | */ | |
94 | snapc = ceph_get_snap_context(ci->i_snap_realm->cached_context); | |
95 | ||
96 | /* dirty the head */ | |
be655596 | 97 | spin_lock(&ci->i_ceph_lock); |
7d8cb26d | 98 | if (ci->i_head_snapc == NULL) |
1d3576fd SW |
99 | ci->i_head_snapc = ceph_get_snap_context(snapc); |
100 | ++ci->i_wrbuffer_ref_head; | |
101 | if (ci->i_wrbuffer_ref == 0) | |
0444d76a | 102 | ihold(inode); |
1d3576fd SW |
103 | ++ci->i_wrbuffer_ref; |
104 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " | |
105 | "snapc %p seq %lld (%d snaps)\n", | |
106 | mapping->host, page, page->index, | |
107 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, | |
108 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
109 | snapc, snapc->seq, snapc->num_snaps); | |
be655596 | 110 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd | 111 | |
7d6e1f54 SZ |
112 | /* |
113 | * Reference snap context in page->private. Also set | |
114 | * PagePrivate so that we get invalidatepage callback. | |
115 | */ | |
116 | BUG_ON(PagePrivate(page)); | |
117 | page->private = (unsigned long)snapc; | |
118 | SetPagePrivate(page); | |
1d3576fd | 119 | |
7d6e1f54 SZ |
120 | ret = __set_page_dirty_nobuffers(page); |
121 | WARN_ON(!PageLocked(page)); | |
122 | WARN_ON(!page->mapping); | |
1d3576fd | 123 | |
7d6e1f54 | 124 | return ret; |
1d3576fd SW |
125 | } |
126 | ||
127 | /* | |
128 | * If we are truncating the full page (i.e. offset == 0), adjust the | |
129 | * dirty page counters appropriately. Only called if there is private | |
130 | * data on the page. | |
131 | */ | |
d47992f8 LC |
132 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
133 | unsigned int length) | |
1d3576fd | 134 | { |
4ce1e9ad | 135 | struct inode *inode; |
1d3576fd | 136 | struct ceph_inode_info *ci; |
61600ef8 | 137 | struct ceph_snap_context *snapc = page_snap_context(page); |
1d3576fd | 138 | |
4ce1e9ad | 139 | inode = page->mapping->host; |
b150f5c1 MT |
140 | ci = ceph_inode(inode); |
141 | ||
142 | if (offset != 0 || length != PAGE_CACHE_SIZE) { | |
143 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", | |
144 | inode, page, page->index, offset, length); | |
145 | return; | |
146 | } | |
4ce1e9ad | 147 | |
99ccbd22 MT |
148 | ceph_invalidate_fscache_page(inode, page); |
149 | ||
150 | if (!PagePrivate(page)) | |
151 | return; | |
152 | ||
1d3576fd SW |
153 | /* |
154 | * We can get non-dirty pages here due to races between | |
155 | * set_page_dirty and truncate_complete_page; just spit out a | |
156 | * warning, in case we end up with accounting problems later. | |
157 | */ | |
158 | if (!PageDirty(page)) | |
159 | pr_err("%p invalidatepage %p page not dirty\n", inode, page); | |
160 | ||
b150f5c1 | 161 | ClearPageChecked(page); |
1d3576fd | 162 | |
b150f5c1 MT |
163 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
164 | inode, page, page->index); | |
165 | ||
166 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
167 | ceph_put_snap_context(snapc); | |
168 | page->private = 0; | |
169 | ClearPagePrivate(page); | |
1d3576fd SW |
170 | } |
171 | ||
1d3576fd SW |
172 | static int ceph_releasepage(struct page *page, gfp_t g) |
173 | { | |
174 | struct inode *inode = page->mapping ? page->mapping->host : NULL; | |
175 | dout("%p releasepage %p idx %lu\n", inode, page, page->index); | |
176 | WARN_ON(PageDirty(page)); | |
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 | ||
185 | /* | |
186 | * read a single page, without unlocking it. | |
187 | */ | |
188 | static int readpage_nounlock(struct file *filp, struct page *page) | |
189 | { | |
496ad9aa | 190 | struct inode *inode = file_inode(filp); |
1d3576fd | 191 | struct ceph_inode_info *ci = ceph_inode(inode); |
99ccbd22 | 192 | struct ceph_osd_client *osdc = |
3d14c5d2 | 193 | &ceph_inode_to_client(inode)->client->osdc; |
1d3576fd | 194 | int err = 0; |
83701246 | 195 | u64 off = page_offset(page); |
1d3576fd SW |
196 | u64 len = PAGE_CACHE_SIZE; |
197 | ||
83701246 YZ |
198 | if (off >= i_size_read(inode)) { |
199 | zero_user_segment(page, err, PAGE_CACHE_SIZE); | |
200 | SetPageUptodate(page); | |
201 | return 0; | |
202 | } | |
99ccbd22 | 203 | |
83701246 YZ |
204 | /* |
205 | * Uptodate inline data should have been added into page cache | |
206 | * while getting Fcr caps. | |
207 | */ | |
208 | if (ci->i_inline_version != CEPH_INLINE_NONE) | |
209 | return -EINVAL; | |
210 | ||
211 | err = ceph_readpage_from_fscache(inode, page); | |
99ccbd22 MT |
212 | if (err == 0) |
213 | goto out; | |
214 | ||
1d3576fd SW |
215 | dout("readpage inode %p file %p page %p index %lu\n", |
216 | inode, filp, page, page->index); | |
217 | err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, | |
83701246 | 218 | off, &len, |
1d3576fd | 219 | ci->i_truncate_seq, ci->i_truncate_size, |
b7495fc2 | 220 | &page, 1, 0); |
1d3576fd SW |
221 | if (err == -ENOENT) |
222 | err = 0; | |
223 | if (err < 0) { | |
224 | SetPageError(page); | |
18302805 | 225 | ceph_fscache_readpage_cancel(inode, page); |
1d3576fd | 226 | goto out; |
1d3576fd | 227 | } |
23cd573b ZZ |
228 | if (err < PAGE_CACHE_SIZE) |
229 | /* zero fill remainder of page */ | |
230 | zero_user_segment(page, err, PAGE_CACHE_SIZE); | |
231 | else | |
232 | flush_dcache_page(page); | |
1d3576fd | 233 | |
23cd573b ZZ |
234 | SetPageUptodate(page); |
235 | ceph_readpage_to_fscache(inode, page); | |
99ccbd22 | 236 | |
1d3576fd SW |
237 | out: |
238 | return err < 0 ? err : 0; | |
239 | } | |
240 | ||
241 | static int ceph_readpage(struct file *filp, struct page *page) | |
242 | { | |
243 | int r = readpage_nounlock(filp, page); | |
244 | unlock_page(page); | |
245 | return r; | |
246 | } | |
247 | ||
248 | /* | |
7c272194 | 249 | * Finish an async read(ahead) op. |
1d3576fd | 250 | */ |
7c272194 | 251 | static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg) |
1d3576fd | 252 | { |
7c272194 | 253 | struct inode *inode = req->r_inode; |
87060c10 | 254 | struct ceph_osd_data *osd_data; |
1b83bef2 SW |
255 | int rc = req->r_result; |
256 | int bytes = le32_to_cpu(msg->hdr.data_len); | |
e0c59487 | 257 | int num_pages; |
7c272194 | 258 | int i; |
1d3576fd | 259 | |
7c272194 SW |
260 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
261 | ||
262 | /* unlock all pages, zeroing any data we didn't read */ | |
406e2c9f | 263 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
264 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
265 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
266 | (u64)osd_data->length); | |
e0c59487 | 267 | for (i = 0; i < num_pages; i++) { |
87060c10 | 268 | struct page *page = osd_data->pages[i]; |
7c272194 | 269 | |
f36132a7 LW |
270 | if (rc < 0) |
271 | goto unlock; | |
7c272194 SW |
272 | if (bytes < (int)PAGE_CACHE_SIZE) { |
273 | /* zero (remainder of) page */ | |
274 | int s = bytes < 0 ? 0 : bytes; | |
275 | zero_user_segment(page, s, PAGE_CACHE_SIZE); | |
1d3576fd | 276 | } |
7c272194 SW |
277 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
278 | page->index); | |
279 | flush_dcache_page(page); | |
280 | SetPageUptodate(page); | |
99ccbd22 | 281 | ceph_readpage_to_fscache(inode, page); |
f36132a7 | 282 | unlock: |
7c272194 SW |
283 | unlock_page(page); |
284 | page_cache_release(page); | |
0fff87ec | 285 | bytes -= PAGE_CACHE_SIZE; |
1d3576fd | 286 | } |
87060c10 | 287 | kfree(osd_data->pages); |
1d3576fd SW |
288 | } |
289 | ||
8884d53d DZ |
290 | static void ceph_unlock_page_vector(struct page **pages, int num_pages) |
291 | { | |
292 | int i; | |
293 | ||
294 | for (i = 0; i < num_pages; i++) | |
295 | unlock_page(pages[i]); | |
296 | } | |
297 | ||
1d3576fd | 298 | /* |
7c272194 SW |
299 | * start an async read(ahead) operation. return nr_pages we submitted |
300 | * a read for on success, or negative error code. | |
1d3576fd | 301 | */ |
0d66a487 | 302 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
1d3576fd | 303 | { |
3d14c5d2 YS |
304 | struct ceph_osd_client *osdc = |
305 | &ceph_inode_to_client(inode)->client->osdc; | |
7c272194 SW |
306 | struct ceph_inode_info *ci = ceph_inode(inode); |
307 | struct page *page = list_entry(page_list->prev, struct page, lru); | |
acead002 | 308 | struct ceph_vino vino; |
7c272194 SW |
309 | struct ceph_osd_request *req; |
310 | u64 off; | |
1d3576fd | 311 | u64 len; |
7c272194 SW |
312 | int i; |
313 | struct page **pages; | |
314 | pgoff_t next_index; | |
315 | int nr_pages = 0; | |
316 | int ret; | |
1d3576fd | 317 | |
6285bc23 | 318 | off = (u64) page_offset(page); |
1d3576fd | 319 | |
7c272194 SW |
320 | /* count pages */ |
321 | next_index = page->index; | |
322 | list_for_each_entry_reverse(page, page_list, lru) { | |
323 | if (page->index != next_index) | |
324 | break; | |
325 | nr_pages++; | |
326 | next_index++; | |
0d66a487 SW |
327 | if (max && nr_pages == max) |
328 | break; | |
7c272194 | 329 | } |
1d3576fd | 330 | len = nr_pages << PAGE_CACHE_SHIFT; |
7c272194 SW |
331 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
332 | off, len); | |
acead002 AE |
333 | vino = ceph_vino(inode); |
334 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, | |
715e4cd4 | 335 | 0, 1, CEPH_OSD_OP_READ, |
acead002 | 336 | CEPH_OSD_FLAG_READ, NULL, |
7c272194 | 337 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 338 | false); |
6816282d SW |
339 | if (IS_ERR(req)) |
340 | return PTR_ERR(req); | |
1d3576fd | 341 | |
7c272194 | 342 | /* build page vector */ |
cf7b7e14 | 343 | nr_pages = calc_pages_for(0, len); |
7c272194 SW |
344 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_NOFS); |
345 | ret = -ENOMEM; | |
346 | if (!pages) | |
347 | goto out; | |
348 | for (i = 0; i < nr_pages; ++i) { | |
349 | page = list_entry(page_list->prev, struct page, lru); | |
350 | BUG_ON(PageLocked(page)); | |
1d3576fd | 351 | list_del(&page->lru); |
99ccbd22 | 352 | |
7c272194 SW |
353 | dout("start_read %p adding %p idx %lu\n", inode, page, |
354 | page->index); | |
355 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, | |
213c99ee | 356 | GFP_NOFS)) { |
d4d3aa38 | 357 | ceph_fscache_uncache_page(inode, page); |
1d3576fd | 358 | page_cache_release(page); |
7c272194 | 359 | dout("start_read %p add_to_page_cache failed %p\n", |
1d3576fd | 360 | inode, page); |
7c272194 SW |
361 | nr_pages = i; |
362 | goto out_pages; | |
1d3576fd | 363 | } |
7c272194 | 364 | pages[i] = page; |
1d3576fd | 365 | } |
406e2c9f | 366 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
7c272194 SW |
367 | req->r_callback = finish_read; |
368 | req->r_inode = inode; | |
369 | ||
79528734 | 370 | ceph_osdc_build_request(req, off, NULL, vino.snap, NULL); |
02ee07d3 | 371 | |
7c272194 SW |
372 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); |
373 | ret = ceph_osdc_start_request(osdc, req, false); | |
374 | if (ret < 0) | |
375 | goto out_pages; | |
376 | ceph_osdc_put_request(req); | |
377 | return nr_pages; | |
378 | ||
379 | out_pages: | |
8884d53d | 380 | ceph_unlock_page_vector(pages, nr_pages); |
7c272194 | 381 | ceph_release_page_vector(pages, nr_pages); |
7c272194 SW |
382 | out: |
383 | ceph_osdc_put_request(req); | |
384 | return ret; | |
385 | } | |
1d3576fd | 386 | |
7c272194 SW |
387 | |
388 | /* | |
389 | * Read multiple pages. Leave pages we don't read + unlock in page_list; | |
390 | * the caller (VM) cleans them up. | |
391 | */ | |
392 | static int ceph_readpages(struct file *file, struct address_space *mapping, | |
393 | struct list_head *page_list, unsigned nr_pages) | |
394 | { | |
496ad9aa | 395 | struct inode *inode = file_inode(file); |
0d66a487 | 396 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
7c272194 | 397 | int rc = 0; |
0d66a487 SW |
398 | int max = 0; |
399 | ||
83701246 YZ |
400 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
401 | return -EINVAL; | |
402 | ||
99ccbd22 MT |
403 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
404 | &nr_pages); | |
405 | ||
406 | if (rc == 0) | |
407 | goto out; | |
408 | ||
0d66a487 SW |
409 | if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE) |
410 | max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1) | |
411 | >> PAGE_SHIFT; | |
7c272194 | 412 | |
2794a82a AE |
413 | dout("readpages %p file %p nr_pages %d max %d\n", inode, |
414 | file, nr_pages, | |
0d66a487 | 415 | max); |
7c272194 | 416 | while (!list_empty(page_list)) { |
0d66a487 | 417 | rc = start_read(inode, page_list, max); |
7c272194 SW |
418 | if (rc < 0) |
419 | goto out; | |
420 | BUG_ON(rc == 0); | |
421 | } | |
1d3576fd | 422 | out: |
76be778b MT |
423 | ceph_fscache_readpages_cancel(inode, page_list); |
424 | ||
7c272194 | 425 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
1d3576fd SW |
426 | return rc; |
427 | } | |
428 | ||
429 | /* | |
430 | * Get ref for the oldest snapc for an inode with dirty data... that is, the | |
431 | * only snap context we are allowed to write back. | |
1d3576fd | 432 | */ |
6298a337 SW |
433 | static struct ceph_snap_context *get_oldest_context(struct inode *inode, |
434 | u64 *snap_size) | |
1d3576fd SW |
435 | { |
436 | struct ceph_inode_info *ci = ceph_inode(inode); | |
437 | struct ceph_snap_context *snapc = NULL; | |
438 | struct ceph_cap_snap *capsnap = NULL; | |
439 | ||
be655596 | 440 | spin_lock(&ci->i_ceph_lock); |
1d3576fd SW |
441 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
442 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, | |
443 | capsnap->context, capsnap->dirty_pages); | |
444 | if (capsnap->dirty_pages) { | |
445 | snapc = ceph_get_snap_context(capsnap->context); | |
446 | if (snap_size) | |
447 | *snap_size = capsnap->size; | |
448 | break; | |
449 | } | |
450 | } | |
7d8cb26d | 451 | if (!snapc && ci->i_wrbuffer_ref_head) { |
80e755fe | 452 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
1d3576fd SW |
453 | dout(" head snapc %p has %d dirty pages\n", |
454 | snapc, ci->i_wrbuffer_ref_head); | |
455 | } | |
be655596 | 456 | spin_unlock(&ci->i_ceph_lock); |
1d3576fd SW |
457 | return snapc; |
458 | } | |
459 | ||
460 | /* | |
461 | * Write a single page, but leave the page locked. | |
462 | * | |
463 | * If we get a write error, set the page error bit, but still adjust the | |
464 | * dirty page accounting (i.e., page is no longer dirty). | |
465 | */ | |
466 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) | |
467 | { | |
468 | struct inode *inode; | |
469 | struct ceph_inode_info *ci; | |
3d14c5d2 | 470 | struct ceph_fs_client *fsc; |
1d3576fd | 471 | struct ceph_osd_client *osdc; |
6298a337 | 472 | struct ceph_snap_context *snapc, *oldest; |
fc2744aa | 473 | loff_t page_off = page_offset(page); |
2baba250 | 474 | long writeback_stat; |
fc2744aa YZ |
475 | u64 truncate_size, snap_size = 0; |
476 | u32 truncate_seq; | |
477 | int err = 0, len = PAGE_CACHE_SIZE; | |
1d3576fd SW |
478 | |
479 | dout("writepage %p idx %lu\n", page, page->index); | |
480 | ||
481 | if (!page->mapping || !page->mapping->host) { | |
482 | dout("writepage %p - no mapping\n", page); | |
483 | return -EFAULT; | |
484 | } | |
485 | inode = page->mapping->host; | |
486 | ci = ceph_inode(inode); | |
3d14c5d2 YS |
487 | fsc = ceph_inode_to_client(inode); |
488 | osdc = &fsc->client->osdc; | |
1d3576fd SW |
489 | |
490 | /* verify this is a writeable snap context */ | |
61600ef8 | 491 | snapc = page_snap_context(page); |
1d3576fd SW |
492 | if (snapc == NULL) { |
493 | dout("writepage %p page %p not dirty?\n", inode, page); | |
494 | goto out; | |
495 | } | |
6298a337 SW |
496 | oldest = get_oldest_context(inode, &snap_size); |
497 | if (snapc->seq > oldest->seq) { | |
1d3576fd | 498 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
61600ef8 | 499 | inode, page, snapc); |
1d3576fd SW |
500 | /* we should only noop if called by kswapd */ |
501 | WARN_ON((current->flags & PF_MEMALLOC) == 0); | |
6298a337 | 502 | ceph_put_snap_context(oldest); |
1d3576fd SW |
503 | goto out; |
504 | } | |
6298a337 | 505 | ceph_put_snap_context(oldest); |
1d3576fd | 506 | |
fc2744aa YZ |
507 | spin_lock(&ci->i_ceph_lock); |
508 | truncate_seq = ci->i_truncate_seq; | |
509 | truncate_size = ci->i_truncate_size; | |
510 | if (!snap_size) | |
511 | snap_size = i_size_read(inode); | |
512 | spin_unlock(&ci->i_ceph_lock); | |
513 | ||
1d3576fd | 514 | /* is this a partial page at end of file? */ |
fc2744aa YZ |
515 | if (page_off >= snap_size) { |
516 | dout("%p page eof %llu\n", page, snap_size); | |
517 | goto out; | |
518 | } | |
519 | if (snap_size < page_off + len) | |
520 | len = snap_size - page_off; | |
1d3576fd | 521 | |
ae00d4f3 SW |
522 | dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", |
523 | inode, page, page->index, page_off, len, snapc); | |
1d3576fd | 524 | |
3d14c5d2 | 525 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
2baba250 | 526 | if (writeback_stat > |
3d14c5d2 YS |
527 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
528 | set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); | |
2baba250 | 529 | |
99ccbd22 MT |
530 | ceph_readpage_to_fscache(inode, page); |
531 | ||
1d3576fd SW |
532 | set_page_writeback(page); |
533 | err = ceph_osdc_writepages(osdc, ceph_vino(inode), | |
534 | &ci->i_layout, snapc, | |
535 | page_off, len, | |
fc2744aa | 536 | truncate_seq, truncate_size, |
24808826 | 537 | &inode->i_mtime, &page, 1); |
1d3576fd SW |
538 | if (err < 0) { |
539 | dout("writepage setting page/mapping error %d %p\n", err, page); | |
540 | SetPageError(page); | |
541 | mapping_set_error(&inode->i_data, err); | |
542 | if (wbc) | |
543 | wbc->pages_skipped++; | |
544 | } else { | |
545 | dout("writepage cleaned page %p\n", page); | |
546 | err = 0; /* vfs expects us to return 0 */ | |
547 | } | |
548 | page->private = 0; | |
549 | ClearPagePrivate(page); | |
550 | end_page_writeback(page); | |
551 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); | |
6298a337 | 552 | ceph_put_snap_context(snapc); /* page's reference */ |
1d3576fd SW |
553 | out: |
554 | return err; | |
555 | } | |
556 | ||
557 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) | |
558 | { | |
dbd646a8 YS |
559 | int err; |
560 | struct inode *inode = page->mapping->host; | |
561 | BUG_ON(!inode); | |
70b666c3 | 562 | ihold(inode); |
dbd646a8 | 563 | err = writepage_nounlock(page, wbc); |
1d3576fd | 564 | unlock_page(page); |
dbd646a8 | 565 | iput(inode); |
1d3576fd SW |
566 | return err; |
567 | } | |
568 | ||
569 | ||
570 | /* | |
571 | * lame release_pages helper. release_pages() isn't exported to | |
572 | * modules. | |
573 | */ | |
574 | static void ceph_release_pages(struct page **pages, int num) | |
575 | { | |
576 | struct pagevec pvec; | |
577 | int i; | |
578 | ||
579 | pagevec_init(&pvec, 0); | |
580 | for (i = 0; i < num; i++) { | |
581 | if (pagevec_add(&pvec, pages[i]) == 0) | |
582 | pagevec_release(&pvec); | |
583 | } | |
584 | pagevec_release(&pvec); | |
585 | } | |
586 | ||
1d3576fd SW |
587 | /* |
588 | * async writeback completion handler. | |
589 | * | |
590 | * If we get an error, set the mapping error bit, but not the individual | |
591 | * page error bits. | |
592 | */ | |
593 | static void writepages_finish(struct ceph_osd_request *req, | |
594 | struct ceph_msg *msg) | |
595 | { | |
596 | struct inode *inode = req->r_inode; | |
1d3576fd | 597 | struct ceph_inode_info *ci = ceph_inode(inode); |
87060c10 | 598 | struct ceph_osd_data *osd_data; |
1d3576fd | 599 | unsigned wrote; |
1d3576fd | 600 | struct page *page; |
e0c59487 | 601 | int num_pages; |
1d3576fd SW |
602 | int i; |
603 | struct ceph_snap_context *snapc = req->r_snapc; | |
604 | struct address_space *mapping = inode->i_mapping; | |
1b83bef2 | 605 | int rc = req->r_result; |
79528734 | 606 | u64 bytes = req->r_ops[0].extent.length; |
3d14c5d2 | 607 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
2baba250 | 608 | long writeback_stat; |
7ff899da | 609 | unsigned issued = ceph_caps_issued(ci); |
1d3576fd | 610 | |
406e2c9f | 611 | osd_data = osd_req_op_extent_osd_data(req, 0); |
87060c10 AE |
612 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
613 | num_pages = calc_pages_for((u64)osd_data->alignment, | |
614 | (u64)osd_data->length); | |
1d3576fd | 615 | if (rc >= 0) { |
79788c69 SW |
616 | /* |
617 | * Assume we wrote the pages we originally sent. The | |
618 | * osd might reply with fewer pages if our writeback | |
619 | * raced with a truncation and was adjusted at the osd, | |
620 | * so don't believe the reply. | |
621 | */ | |
e0c59487 | 622 | wrote = num_pages; |
1d3576fd SW |
623 | } else { |
624 | wrote = 0; | |
625 | mapping_set_error(mapping, rc); | |
626 | } | |
627 | dout("writepages_finish %p rc %d bytes %llu wrote %d (pages)\n", | |
628 | inode, rc, bytes, wrote); | |
629 | ||
630 | /* clean all pages */ | |
e0c59487 | 631 | for (i = 0; i < num_pages; i++) { |
87060c10 | 632 | page = osd_data->pages[i]; |
1d3576fd SW |
633 | BUG_ON(!page); |
634 | WARN_ON(!PageUptodate(page)); | |
635 | ||
2baba250 | 636 | writeback_stat = |
3d14c5d2 | 637 | atomic_long_dec_return(&fsc->writeback_count); |
2baba250 | 638 | if (writeback_stat < |
3d14c5d2 YS |
639 | CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) |
640 | clear_bdi_congested(&fsc->backing_dev_info, | |
2baba250 YS |
641 | BLK_RW_ASYNC); |
642 | ||
61600ef8 | 643 | ceph_put_snap_context(page_snap_context(page)); |
1d3576fd SW |
644 | page->private = 0; |
645 | ClearPagePrivate(page); | |
1d3576fd SW |
646 | dout("unlocking %d %p\n", i, page); |
647 | end_page_writeback(page); | |
e63dc5c7 YS |
648 | |
649 | /* | |
650 | * We lost the cache cap, need to truncate the page before | |
651 | * it is unlocked, otherwise we'd truncate it later in the | |
652 | * page truncation thread, possibly losing some data that | |
653 | * raced its way in | |
654 | */ | |
2962507c | 655 | if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) |
e63dc5c7 YS |
656 | generic_error_remove_page(inode->i_mapping, page); |
657 | ||
1d3576fd SW |
658 | unlock_page(page); |
659 | } | |
660 | dout("%p wrote+cleaned %d pages\n", inode, wrote); | |
e0c59487 | 661 | ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc); |
1d3576fd | 662 | |
87060c10 AE |
663 | ceph_release_pages(osd_data->pages, num_pages); |
664 | if (osd_data->pages_from_pool) | |
665 | mempool_free(osd_data->pages, | |
640ef79d | 666 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
1d3576fd | 667 | else |
87060c10 | 668 | kfree(osd_data->pages); |
1d3576fd SW |
669 | ceph_osdc_put_request(req); |
670 | } | |
671 | ||
1d3576fd SW |
672 | /* |
673 | * initiate async writeback | |
674 | */ | |
675 | static int ceph_writepages_start(struct address_space *mapping, | |
676 | struct writeback_control *wbc) | |
677 | { | |
678 | struct inode *inode = mapping->host; | |
1d3576fd | 679 | struct ceph_inode_info *ci = ceph_inode(inode); |
fc2744aa YZ |
680 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
681 | struct ceph_vino vino = ceph_vino(inode); | |
1d3576fd SW |
682 | pgoff_t index, start, end; |
683 | int range_whole = 0; | |
684 | int should_loop = 1; | |
685 | pgoff_t max_pages = 0, max_pages_ever = 0; | |
80e755fe | 686 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
1d3576fd SW |
687 | struct pagevec pvec; |
688 | int done = 0; | |
689 | int rc = 0; | |
690 | unsigned wsize = 1 << inode->i_blkbits; | |
691 | struct ceph_osd_request *req = NULL; | |
021b77be | 692 | int do_sync = 0; |
fc2744aa YZ |
693 | u64 truncate_size, snap_size; |
694 | u32 truncate_seq; | |
1d3576fd SW |
695 | |
696 | /* | |
697 | * Include a 'sync' in the OSD request if this is a data | |
698 | * integrity write (e.g., O_SYNC write or fsync()), or if our | |
699 | * cap is being revoked. | |
700 | */ | |
c62988ec | 701 | if ((wbc->sync_mode == WB_SYNC_ALL) || |
702 | ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) | |
1d3576fd SW |
703 | do_sync = 1; |
704 | dout("writepages_start %p dosync=%d (mode=%s)\n", | |
705 | inode, do_sync, | |
706 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : | |
707 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); | |
708 | ||
3d14c5d2 | 709 | if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) { |
f3ae1b97 | 710 | pr_warn("writepage_start %p on forced umount\n", inode); |
1d3576fd SW |
711 | return -EIO; /* we're in a forced umount, don't write! */ |
712 | } | |
3d14c5d2 YS |
713 | if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) |
714 | wsize = fsc->mount_options->wsize; | |
1d3576fd SW |
715 | if (wsize < PAGE_CACHE_SIZE) |
716 | wsize = PAGE_CACHE_SIZE; | |
717 | max_pages_ever = wsize >> PAGE_CACHE_SHIFT; | |
718 | ||
719 | pagevec_init(&pvec, 0); | |
720 | ||
1d3576fd SW |
721 | /* where to start/end? */ |
722 | if (wbc->range_cyclic) { | |
723 | start = mapping->writeback_index; /* Start from prev offset */ | |
724 | end = -1; | |
725 | dout(" cyclic, start at %lu\n", start); | |
726 | } else { | |
727 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
728 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
729 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
730 | range_whole = 1; | |
731 | should_loop = 0; | |
732 | dout(" not cyclic, %lu to %lu\n", start, end); | |
733 | } | |
734 | index = start; | |
735 | ||
736 | retry: | |
737 | /* find oldest snap context with dirty data */ | |
738 | ceph_put_snap_context(snapc); | |
1ac0fc8a | 739 | snap_size = 0; |
1d3576fd SW |
740 | snapc = get_oldest_context(inode, &snap_size); |
741 | if (!snapc) { | |
742 | /* hmm, why does writepages get called when there | |
743 | is no dirty data? */ | |
744 | dout(" no snap context with dirty data?\n"); | |
745 | goto out; | |
746 | } | |
1ac0fc8a YZ |
747 | if (snap_size == 0) |
748 | snap_size = i_size_read(inode); | |
1d3576fd SW |
749 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", |
750 | snapc, snapc->seq, snapc->num_snaps); | |
fc2744aa YZ |
751 | |
752 | spin_lock(&ci->i_ceph_lock); | |
753 | truncate_seq = ci->i_truncate_seq; | |
754 | truncate_size = ci->i_truncate_size; | |
755 | if (!snap_size) | |
756 | snap_size = i_size_read(inode); | |
757 | spin_unlock(&ci->i_ceph_lock); | |
758 | ||
1d3576fd SW |
759 | if (last_snapc && snapc != last_snapc) { |
760 | /* if we switched to a newer snapc, restart our scan at the | |
761 | * start of the original file range. */ | |
762 | dout(" snapc differs from last pass, restarting at %lu\n", | |
763 | index); | |
764 | index = start; | |
765 | } | |
766 | last_snapc = snapc; | |
767 | ||
768 | while (!done && index <= end) { | |
769 | unsigned i; | |
770 | int first; | |
771 | pgoff_t next; | |
772 | int pvec_pages, locked_pages; | |
e5975c7c AE |
773 | struct page **pages = NULL; |
774 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ | |
1d3576fd SW |
775 | struct page *page; |
776 | int want; | |
777 | u64 offset, len; | |
2baba250 | 778 | long writeback_stat; |
1d3576fd SW |
779 | |
780 | next = 0; | |
781 | locked_pages = 0; | |
782 | max_pages = max_pages_ever; | |
783 | ||
784 | get_more_pages: | |
785 | first = -1; | |
786 | want = min(end - index, | |
787 | min((pgoff_t)PAGEVEC_SIZE, | |
788 | max_pages - (pgoff_t)locked_pages) - 1) | |
789 | + 1; | |
790 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
791 | PAGECACHE_TAG_DIRTY, | |
792 | want); | |
793 | dout("pagevec_lookup_tag got %d\n", pvec_pages); | |
794 | if (!pvec_pages && !locked_pages) | |
795 | break; | |
796 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { | |
797 | page = pvec.pages[i]; | |
798 | dout("? %p idx %lu\n", page, page->index); | |
799 | if (locked_pages == 0) | |
800 | lock_page(page); /* first page */ | |
801 | else if (!trylock_page(page)) | |
802 | break; | |
803 | ||
804 | /* only dirty pages, or our accounting breaks */ | |
805 | if (unlikely(!PageDirty(page)) || | |
806 | unlikely(page->mapping != mapping)) { | |
807 | dout("!dirty or !mapping %p\n", page); | |
808 | unlock_page(page); | |
809 | break; | |
810 | } | |
811 | if (!wbc->range_cyclic && page->index > end) { | |
812 | dout("end of range %p\n", page); | |
813 | done = 1; | |
814 | unlock_page(page); | |
815 | break; | |
816 | } | |
817 | if (next && (page->index != next)) { | |
818 | dout("not consecutive %p\n", page); | |
819 | unlock_page(page); | |
820 | break; | |
821 | } | |
822 | if (wbc->sync_mode != WB_SYNC_NONE) { | |
823 | dout("waiting on writeback %p\n", page); | |
824 | wait_on_page_writeback(page); | |
825 | } | |
1ac0fc8a YZ |
826 | if (page_offset(page) >= snap_size) { |
827 | dout("%p page eof %llu\n", page, snap_size); | |
1d3576fd SW |
828 | done = 1; |
829 | unlock_page(page); | |
830 | break; | |
831 | } | |
832 | if (PageWriteback(page)) { | |
833 | dout("%p under writeback\n", page); | |
834 | unlock_page(page); | |
835 | break; | |
836 | } | |
837 | ||
838 | /* only if matching snap context */ | |
61600ef8 | 839 | pgsnapc = page_snap_context(page); |
80e755fe SW |
840 | if (pgsnapc->seq > snapc->seq) { |
841 | dout("page snapc %p %lld > oldest %p %lld\n", | |
842 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); | |
1d3576fd SW |
843 | unlock_page(page); |
844 | if (!locked_pages) | |
845 | continue; /* keep looking for snap */ | |
846 | break; | |
847 | } | |
848 | ||
849 | if (!clear_page_dirty_for_io(page)) { | |
850 | dout("%p !clear_page_dirty_for_io\n", page); | |
851 | unlock_page(page); | |
852 | break; | |
853 | } | |
854 | ||
e5975c7c AE |
855 | /* |
856 | * We have something to write. If this is | |
857 | * the first locked page this time through, | |
858 | * allocate an osd request and a page array | |
859 | * that it will use. | |
860 | */ | |
1d3576fd | 861 | if (locked_pages == 0) { |
e5975c7c | 862 | BUG_ON(pages); |
1d3576fd | 863 | /* prepare async write request */ |
e5975c7c | 864 | offset = (u64)page_offset(page); |
1d3576fd | 865 | len = wsize; |
fc2744aa YZ |
866 | req = ceph_osdc_new_request(&fsc->client->osdc, |
867 | &ci->i_layout, vino, | |
715e4cd4 YZ |
868 | offset, &len, 0, |
869 | do_sync ? 2 : 1, | |
fc2744aa YZ |
870 | CEPH_OSD_OP_WRITE, |
871 | CEPH_OSD_FLAG_WRITE | | |
872 | CEPH_OSD_FLAG_ONDISK, | |
873 | snapc, truncate_seq, | |
874 | truncate_size, true); | |
6816282d SW |
875 | if (IS_ERR(req)) { |
876 | rc = PTR_ERR(req); | |
8c71897b HC |
877 | unlock_page(page); |
878 | break; | |
879 | } | |
880 | ||
715e4cd4 YZ |
881 | if (do_sync) |
882 | osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC); | |
883 | ||
88486957 AE |
884 | req->r_callback = writepages_finish; |
885 | req->r_inode = inode; | |
886 | ||
887 | max_pages = calc_pages_for(0, (u64)len); | |
fc2744aa YZ |
888 | pages = kmalloc(max_pages * sizeof (*pages), |
889 | GFP_NOFS); | |
88486957 AE |
890 | if (!pages) { |
891 | pool = fsc->wb_pagevec_pool; | |
88486957 | 892 | pages = mempool_alloc(pool, GFP_NOFS); |
e5975c7c | 893 | BUG_ON(!pages); |
88486957 | 894 | } |
1d3576fd SW |
895 | } |
896 | ||
897 | /* note position of first page in pvec */ | |
898 | if (first < 0) | |
899 | first = i; | |
900 | dout("%p will write page %p idx %lu\n", | |
901 | inode, page, page->index); | |
2baba250 | 902 | |
213c99ee | 903 | writeback_stat = |
3d14c5d2 | 904 | atomic_long_inc_return(&fsc->writeback_count); |
213c99ee | 905 | if (writeback_stat > CONGESTION_ON_THRESH( |
3d14c5d2 YS |
906 | fsc->mount_options->congestion_kb)) { |
907 | set_bdi_congested(&fsc->backing_dev_info, | |
213c99ee | 908 | BLK_RW_ASYNC); |
2baba250 YS |
909 | } |
910 | ||
1d3576fd | 911 | set_page_writeback(page); |
e5975c7c | 912 | pages[locked_pages] = page; |
1d3576fd SW |
913 | locked_pages++; |
914 | next = page->index + 1; | |
915 | } | |
916 | ||
917 | /* did we get anything? */ | |
918 | if (!locked_pages) | |
919 | goto release_pvec_pages; | |
920 | if (i) { | |
921 | int j; | |
922 | BUG_ON(!locked_pages || first < 0); | |
923 | ||
924 | if (pvec_pages && i == pvec_pages && | |
925 | locked_pages < max_pages) { | |
926 | dout("reached end pvec, trying for more\n"); | |
927 | pagevec_reinit(&pvec); | |
928 | goto get_more_pages; | |
929 | } | |
930 | ||
931 | /* shift unused pages over in the pvec... we | |
932 | * will need to release them below. */ | |
933 | for (j = i; j < pvec_pages; j++) { | |
934 | dout(" pvec leftover page %p\n", | |
935 | pvec.pages[j]); | |
936 | pvec.pages[j-i+first] = pvec.pages[j]; | |
937 | } | |
938 | pvec.nr -= i-first; | |
939 | } | |
940 | ||
e5975c7c AE |
941 | /* Format the osd request message and submit the write */ |
942 | ||
943 | offset = page_offset(pages[0]); | |
1ac0fc8a | 944 | len = min(snap_size - offset, |
1d3576fd SW |
945 | (u64)locked_pages << PAGE_CACHE_SHIFT); |
946 | dout("writepages got %d pages at %llu~%llu\n", | |
947 | locked_pages, offset, len); | |
948 | ||
406e2c9f | 949 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, |
a4ce40a9 | 950 | !!pool, false); |
e5975c7c AE |
951 | |
952 | pages = NULL; /* request message now owns the pages array */ | |
953 | pool = NULL; | |
954 | ||
955 | /* Update the write op length in case we changed it */ | |
956 | ||
c99d2d4a | 957 | osd_req_op_extent_update(req, 0, len); |
e5975c7c AE |
958 | |
959 | vino = ceph_vino(inode); | |
79528734 AE |
960 | ceph_osdc_build_request(req, offset, snapc, vino.snap, |
961 | &inode->i_mtime); | |
1d3576fd | 962 | |
9d6fcb08 SW |
963 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
964 | BUG_ON(rc); | |
1d3576fd SW |
965 | req = NULL; |
966 | ||
967 | /* continue? */ | |
968 | index = next; | |
969 | wbc->nr_to_write -= locked_pages; | |
970 | if (wbc->nr_to_write <= 0) | |
971 | done = 1; | |
972 | ||
973 | release_pvec_pages: | |
974 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, | |
975 | pvec.nr ? pvec.pages[0] : NULL); | |
976 | pagevec_release(&pvec); | |
977 | ||
978 | if (locked_pages && !done) | |
979 | goto retry; | |
980 | } | |
981 | ||
982 | if (should_loop && !done) { | |
983 | /* more to do; loop back to beginning of file */ | |
984 | dout("writepages looping back to beginning of file\n"); | |
985 | should_loop = 0; | |
986 | index = 0; | |
987 | goto retry; | |
988 | } | |
989 | ||
990 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
991 | mapping->writeback_index = index; | |
992 | ||
993 | out: | |
994 | if (req) | |
995 | ceph_osdc_put_request(req); | |
1d3576fd SW |
996 | ceph_put_snap_context(snapc); |
997 | dout("writepages done, rc = %d\n", rc); | |
1d3576fd SW |
998 | return rc; |
999 | } | |
1000 | ||
1001 | ||
1002 | ||
1003 | /* | |
1004 | * See if a given @snapc is either writeable, or already written. | |
1005 | */ | |
1006 | static int context_is_writeable_or_written(struct inode *inode, | |
1007 | struct ceph_snap_context *snapc) | |
1008 | { | |
1009 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); | |
6298a337 SW |
1010 | int ret = !oldest || snapc->seq <= oldest->seq; |
1011 | ||
1012 | ceph_put_snap_context(oldest); | |
1013 | return ret; | |
1d3576fd SW |
1014 | } |
1015 | ||
1016 | /* | |
1017 | * We are only allowed to write into/dirty the page if the page is | |
1018 | * clean, or already dirty within the same snap context. | |
8f883c24 SW |
1019 | * |
1020 | * called with page locked. | |
1021 | * return success with page locked, | |
1022 | * or any failure (incl -EAGAIN) with page unlocked. | |
1d3576fd | 1023 | */ |
4af6b225 YS |
1024 | static int ceph_update_writeable_page(struct file *file, |
1025 | loff_t pos, unsigned len, | |
1026 | struct page *page) | |
1d3576fd | 1027 | { |
496ad9aa | 1028 | struct inode *inode = file_inode(file); |
1d3576fd | 1029 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 1030 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
1d3576fd SW |
1031 | loff_t page_off = pos & PAGE_CACHE_MASK; |
1032 | int pos_in_page = pos & ~PAGE_CACHE_MASK; | |
1033 | int end_in_page = pos_in_page + len; | |
1034 | loff_t i_size; | |
1d3576fd | 1035 | int r; |
80e755fe | 1036 | struct ceph_snap_context *snapc, *oldest; |
1d3576fd | 1037 | |
1d3576fd SW |
1038 | retry_locked: |
1039 | /* writepages currently holds page lock, but if we change that later, */ | |
1040 | wait_on_page_writeback(page); | |
1041 | ||
1042 | /* check snap context */ | |
1043 | BUG_ON(!ci->i_snap_realm); | |
1044 | down_read(&mdsc->snap_rwsem); | |
1045 | BUG_ON(!ci->i_snap_realm->cached_context); | |
61600ef8 | 1046 | snapc = page_snap_context(page); |
80e755fe | 1047 | if (snapc && snapc != ci->i_head_snapc) { |
1d3576fd SW |
1048 | /* |
1049 | * this page is already dirty in another (older) snap | |
1050 | * context! is it writeable now? | |
1051 | */ | |
80e755fe | 1052 | oldest = get_oldest_context(inode, NULL); |
1d3576fd SW |
1053 | up_read(&mdsc->snap_rwsem); |
1054 | ||
80e755fe | 1055 | if (snapc->seq > oldest->seq) { |
6298a337 | 1056 | ceph_put_snap_context(oldest); |
1d3576fd | 1057 | dout(" page %p snapc %p not current or oldest\n", |
6298a337 | 1058 | page, snapc); |
1d3576fd SW |
1059 | /* |
1060 | * queue for writeback, and wait for snapc to | |
1061 | * be writeable or written | |
1062 | */ | |
6298a337 | 1063 | snapc = ceph_get_snap_context(snapc); |
1d3576fd | 1064 | unlock_page(page); |
3c6f6b79 | 1065 | ceph_queue_writeback(inode); |
8f883c24 | 1066 | r = wait_event_interruptible(ci->i_cap_wq, |
1d3576fd SW |
1067 | context_is_writeable_or_written(inode, snapc)); |
1068 | ceph_put_snap_context(snapc); | |
8f883c24 SW |
1069 | if (r == -ERESTARTSYS) |
1070 | return r; | |
4af6b225 | 1071 | return -EAGAIN; |
1d3576fd | 1072 | } |
6298a337 | 1073 | ceph_put_snap_context(oldest); |
1d3576fd SW |
1074 | |
1075 | /* yay, writeable, do it now (without dropping page lock) */ | |
1076 | dout(" page %p snapc %p not current, but oldest\n", | |
1077 | page, snapc); | |
1078 | if (!clear_page_dirty_for_io(page)) | |
1079 | goto retry_locked; | |
1080 | r = writepage_nounlock(page, NULL); | |
1081 | if (r < 0) | |
1082 | goto fail_nosnap; | |
1083 | goto retry_locked; | |
1084 | } | |
1085 | ||
1086 | if (PageUptodate(page)) { | |
1087 | dout(" page %p already uptodate\n", page); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /* full page? */ | |
1092 | if (pos_in_page == 0 && len == PAGE_CACHE_SIZE) | |
1093 | return 0; | |
1094 | ||
1095 | /* past end of file? */ | |
1096 | i_size = inode->i_size; /* caller holds i_mutex */ | |
1097 | ||
1d3576fd SW |
1098 | if (page_off >= i_size || |
1099 | (pos_in_page == 0 && (pos+len) >= i_size && | |
1100 | end_in_page - pos_in_page != PAGE_CACHE_SIZE)) { | |
1101 | dout(" zeroing %p 0 - %d and %d - %d\n", | |
1102 | page, pos_in_page, end_in_page, (int)PAGE_CACHE_SIZE); | |
1103 | zero_user_segments(page, | |
1104 | 0, pos_in_page, | |
1105 | end_in_page, PAGE_CACHE_SIZE); | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | /* we need to read it. */ | |
1110 | up_read(&mdsc->snap_rwsem); | |
1111 | r = readpage_nounlock(file, page); | |
1112 | if (r < 0) | |
1113 | goto fail_nosnap; | |
1114 | goto retry_locked; | |
1d3576fd SW |
1115 | fail_nosnap: |
1116 | unlock_page(page); | |
1117 | return r; | |
1118 | } | |
1119 | ||
4af6b225 YS |
1120 | /* |
1121 | * We are only allowed to write into/dirty the page if the page is | |
1122 | * clean, or already dirty within the same snap context. | |
1123 | */ | |
1124 | static int ceph_write_begin(struct file *file, struct address_space *mapping, | |
1125 | loff_t pos, unsigned len, unsigned flags, | |
1126 | struct page **pagep, void **fsdata) | |
1127 | { | |
496ad9aa | 1128 | struct inode *inode = file_inode(file); |
4af6b225 YS |
1129 | struct page *page; |
1130 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
7971bd92 | 1131 | int r; |
4af6b225 YS |
1132 | |
1133 | do { | |
8f883c24 | 1134 | /* get a page */ |
4af6b225 | 1135 | page = grab_cache_page_write_begin(mapping, index, 0); |
7971bd92 SW |
1136 | if (!page) |
1137 | return -ENOMEM; | |
1138 | *pagep = page; | |
4af6b225 YS |
1139 | |
1140 | dout("write_begin file %p inode %p page %p %d~%d\n", file, | |
213c99ee | 1141 | inode, page, (int)pos, (int)len); |
4af6b225 YS |
1142 | |
1143 | r = ceph_update_writeable_page(file, pos, len, page); | |
1144 | } while (r == -EAGAIN); | |
1145 | ||
1146 | return r; | |
1147 | } | |
1148 | ||
1d3576fd SW |
1149 | /* |
1150 | * we don't do anything in here that simple_write_end doesn't do | |
1151 | * except adjust dirty page accounting and drop read lock on | |
1152 | * mdsc->snap_rwsem. | |
1153 | */ | |
1154 | static int ceph_write_end(struct file *file, struct address_space *mapping, | |
1155 | loff_t pos, unsigned len, unsigned copied, | |
1156 | struct page *page, void *fsdata) | |
1157 | { | |
496ad9aa | 1158 | struct inode *inode = file_inode(file); |
3d14c5d2 YS |
1159 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
1160 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1d3576fd SW |
1161 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
1162 | int check_cap = 0; | |
1163 | ||
1164 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, | |
1165 | inode, page, (int)pos, (int)copied, (int)len); | |
1166 | ||
1167 | /* zero the stale part of the page if we did a short copy */ | |
1168 | if (copied < len) | |
1169 | zero_user_segment(page, from+copied, len); | |
1170 | ||
1171 | /* did file size increase? */ | |
1172 | /* (no need for i_size_read(); we caller holds i_mutex */ | |
1173 | if (pos+copied > inode->i_size) | |
1174 | check_cap = ceph_inode_set_size(inode, pos+copied); | |
1175 | ||
1176 | if (!PageUptodate(page)) | |
1177 | SetPageUptodate(page); | |
1178 | ||
1179 | set_page_dirty(page); | |
1180 | ||
1181 | unlock_page(page); | |
1182 | up_read(&mdsc->snap_rwsem); | |
1183 | page_cache_release(page); | |
1184 | ||
1185 | if (check_cap) | |
1186 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); | |
1187 | ||
1188 | return copied; | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * we set .direct_IO to indicate direct io is supported, but since we | |
1193 | * intercept O_DIRECT reads and writes early, this function should | |
1194 | * never get called. | |
1195 | */ | |
1196 | static ssize_t ceph_direct_io(int rw, struct kiocb *iocb, | |
d8d3d94b AV |
1197 | struct iov_iter *iter, |
1198 | loff_t pos) | |
1d3576fd SW |
1199 | { |
1200 | WARN_ON(1); | |
1201 | return -EINVAL; | |
1202 | } | |
1203 | ||
1204 | const struct address_space_operations ceph_aops = { | |
1205 | .readpage = ceph_readpage, | |
1206 | .readpages = ceph_readpages, | |
1207 | .writepage = ceph_writepage, | |
1208 | .writepages = ceph_writepages_start, | |
1209 | .write_begin = ceph_write_begin, | |
1210 | .write_end = ceph_write_end, | |
1211 | .set_page_dirty = ceph_set_page_dirty, | |
1212 | .invalidatepage = ceph_invalidatepage, | |
1213 | .releasepage = ceph_releasepage, | |
1214 | .direct_IO = ceph_direct_io, | |
1215 | }; | |
1216 | ||
1217 | ||
1218 | /* | |
1219 | * vm ops | |
1220 | */ | |
61f68816 YZ |
1221 | static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1222 | { | |
1223 | struct inode *inode = file_inode(vma->vm_file); | |
1224 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1225 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3738daa6 | 1226 | struct page *pinned_page = NULL; |
61f68816 YZ |
1227 | loff_t off = vmf->pgoff << PAGE_CACHE_SHIFT; |
1228 | int want, got, ret; | |
1229 | ||
1230 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", | |
37b52fe6 | 1231 | inode, ceph_vinop(inode), off, (size_t)PAGE_CACHE_SIZE); |
61f68816 YZ |
1232 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1233 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1234 | else | |
1235 | want = CEPH_CAP_FILE_CACHE; | |
1236 | while (1) { | |
1237 | got = 0; | |
83701246 YZ |
1238 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, |
1239 | -1, &got, &pinned_page); | |
61f68816 YZ |
1240 | if (ret == 0) |
1241 | break; | |
1242 | if (ret != -ERESTARTSYS) { | |
1243 | WARN_ON(1); | |
1244 | return VM_FAULT_SIGBUS; | |
1245 | } | |
1246 | } | |
1247 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", | |
37b52fe6 | 1248 | inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got)); |
61f68816 | 1249 | |
83701246 YZ |
1250 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
1251 | ci->i_inline_version == CEPH_INLINE_NONE) | |
1252 | ret = filemap_fault(vma, vmf); | |
1253 | else | |
1254 | ret = -EAGAIN; | |
61f68816 YZ |
1255 | |
1256 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", | |
37b52fe6 | 1257 | inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret); |
3738daa6 YZ |
1258 | if (pinned_page) |
1259 | page_cache_release(pinned_page); | |
61f68816 YZ |
1260 | ceph_put_cap_refs(ci, got); |
1261 | ||
83701246 YZ |
1262 | if (ret != -EAGAIN) |
1263 | return ret; | |
1264 | ||
1265 | /* read inline data */ | |
1266 | if (off >= PAGE_CACHE_SIZE) { | |
1267 | /* does not support inline data > PAGE_SIZE */ | |
1268 | ret = VM_FAULT_SIGBUS; | |
1269 | } else { | |
1270 | int ret1; | |
1271 | struct address_space *mapping = inode->i_mapping; | |
1272 | struct page *page = find_or_create_page(mapping, 0, | |
1273 | mapping_gfp_mask(mapping) & | |
1274 | ~__GFP_FS); | |
1275 | if (!page) { | |
1276 | ret = VM_FAULT_OOM; | |
1277 | goto out; | |
1278 | } | |
1279 | ret1 = __ceph_do_getattr(inode, page, | |
1280 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1281 | if (ret1 < 0 || off >= i_size_read(inode)) { | |
1282 | unlock_page(page); | |
1283 | page_cache_release(page); | |
1284 | ret = VM_FAULT_SIGBUS; | |
1285 | goto out; | |
1286 | } | |
1287 | if (ret1 < PAGE_CACHE_SIZE) | |
1288 | zero_user_segment(page, ret1, PAGE_CACHE_SIZE); | |
1289 | else | |
1290 | flush_dcache_page(page); | |
1291 | SetPageUptodate(page); | |
1292 | vmf->page = page; | |
1293 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; | |
1294 | } | |
1295 | out: | |
1296 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", | |
1297 | inode, off, (size_t)PAGE_CACHE_SIZE, ret); | |
61f68816 YZ |
1298 | return ret; |
1299 | } | |
1d3576fd SW |
1300 | |
1301 | /* | |
1302 | * Reuse write_begin here for simplicity. | |
1303 | */ | |
1304 | static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1305 | { | |
496ad9aa | 1306 | struct inode *inode = file_inode(vma->vm_file); |
61f68816 YZ |
1307 | struct ceph_inode_info *ci = ceph_inode(inode); |
1308 | struct ceph_file_info *fi = vma->vm_file->private_data; | |
3d14c5d2 | 1309 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
61f68816 | 1310 | struct page *page = vmf->page; |
6285bc23 | 1311 | loff_t off = page_offset(page); |
61f68816 YZ |
1312 | loff_t size = i_size_read(inode); |
1313 | size_t len; | |
1314 | int want, got, ret; | |
3ca9c3bd | 1315 | |
28127bdd YZ |
1316 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1317 | struct page *locked_page = NULL; | |
1318 | if (off == 0) { | |
1319 | lock_page(page); | |
1320 | locked_page = page; | |
1321 | } | |
1322 | ret = ceph_uninline_data(vma->vm_file, locked_page); | |
1323 | if (locked_page) | |
1324 | unlock_page(locked_page); | |
1325 | if (ret < 0) | |
1326 | return VM_FAULT_SIGBUS; | |
1327 | } | |
1328 | ||
1d3576fd SW |
1329 | if (off + PAGE_CACHE_SIZE <= size) |
1330 | len = PAGE_CACHE_SIZE; | |
1331 | else | |
1332 | len = size & ~PAGE_CACHE_MASK; | |
1333 | ||
61f68816 YZ |
1334 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
1335 | inode, ceph_vinop(inode), off, len, size); | |
1336 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1337 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1338 | else | |
1339 | want = CEPH_CAP_FILE_BUFFER; | |
1340 | while (1) { | |
1341 | got = 0; | |
3738daa6 YZ |
1342 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, |
1343 | &got, NULL); | |
61f68816 YZ |
1344 | if (ret == 0) |
1345 | break; | |
1346 | if (ret != -ERESTARTSYS) { | |
1347 | WARN_ON(1); | |
1348 | return VM_FAULT_SIGBUS; | |
1349 | } | |
1350 | } | |
1351 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", | |
1352 | inode, off, len, ceph_cap_string(got)); | |
1353 | ||
1354 | /* Update time before taking page lock */ | |
1355 | file_update_time(vma->vm_file); | |
4af6b225 YS |
1356 | |
1357 | lock_page(page); | |
1358 | ||
1359 | ret = VM_FAULT_NOPAGE; | |
1360 | if ((off > size) || | |
1361 | (page->mapping != inode->i_mapping)) | |
1362 | goto out; | |
1363 | ||
1364 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); | |
1365 | if (ret == 0) { | |
1366 | /* success. we'll keep the page locked. */ | |
1d3576fd SW |
1367 | set_page_dirty(page); |
1368 | up_read(&mdsc->snap_rwsem); | |
1d3576fd SW |
1369 | ret = VM_FAULT_LOCKED; |
1370 | } else { | |
4af6b225 YS |
1371 | if (ret == -ENOMEM) |
1372 | ret = VM_FAULT_OOM; | |
1373 | else | |
1374 | ret = VM_FAULT_SIGBUS; | |
1d3576fd | 1375 | } |
4af6b225 | 1376 | out: |
28127bdd | 1377 | if (ret != VM_FAULT_LOCKED) |
4af6b225 | 1378 | unlock_page(page); |
28127bdd YZ |
1379 | if (ret == VM_FAULT_LOCKED || |
1380 | ci->i_inline_version != CEPH_INLINE_NONE) { | |
61f68816 YZ |
1381 | int dirty; |
1382 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1383 | ci->i_inline_version = CEPH_INLINE_NONE; |
61f68816 YZ |
1384 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
1385 | spin_unlock(&ci->i_ceph_lock); | |
1386 | if (dirty) | |
1387 | __mark_inode_dirty(inode, dirty); | |
1388 | } | |
1389 | ||
1390 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", | |
1391 | inode, off, len, ceph_cap_string(got), ret); | |
1392 | ceph_put_cap_refs(ci, got); | |
1393 | ||
1d3576fd SW |
1394 | return ret; |
1395 | } | |
1396 | ||
31c542a1 YZ |
1397 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
1398 | char *data, size_t len) | |
1399 | { | |
1400 | struct address_space *mapping = inode->i_mapping; | |
1401 | struct page *page; | |
1402 | ||
1403 | if (locked_page) { | |
1404 | page = locked_page; | |
1405 | } else { | |
1406 | if (i_size_read(inode) == 0) | |
1407 | return; | |
1408 | page = find_or_create_page(mapping, 0, | |
1409 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
1410 | if (!page) | |
1411 | return; | |
1412 | if (PageUptodate(page)) { | |
1413 | unlock_page(page); | |
1414 | page_cache_release(page); | |
1415 | return; | |
1416 | } | |
1417 | } | |
1418 | ||
0668ff52 | 1419 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
31c542a1 YZ |
1420 | inode, ceph_vinop(inode), len, locked_page); |
1421 | ||
1422 | if (len > 0) { | |
1423 | void *kaddr = kmap_atomic(page); | |
1424 | memcpy(kaddr, data, len); | |
1425 | kunmap_atomic(kaddr); | |
1426 | } | |
1427 | ||
1428 | if (page != locked_page) { | |
1429 | if (len < PAGE_CACHE_SIZE) | |
1430 | zero_user_segment(page, len, PAGE_CACHE_SIZE); | |
1431 | else | |
1432 | flush_dcache_page(page); | |
1433 | ||
1434 | SetPageUptodate(page); | |
1435 | unlock_page(page); | |
1436 | page_cache_release(page); | |
1437 | } | |
1438 | } | |
1439 | ||
28127bdd YZ |
1440 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
1441 | { | |
1442 | struct inode *inode = file_inode(filp); | |
1443 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1444 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1445 | struct ceph_osd_request *req; | |
1446 | struct page *page = NULL; | |
1447 | u64 len, inline_version; | |
1448 | int err = 0; | |
1449 | bool from_pagecache = false; | |
1450 | ||
1451 | spin_lock(&ci->i_ceph_lock); | |
1452 | inline_version = ci->i_inline_version; | |
1453 | spin_unlock(&ci->i_ceph_lock); | |
1454 | ||
1455 | dout("uninline_data %p %llx.%llx inline_version %llu\n", | |
1456 | inode, ceph_vinop(inode), inline_version); | |
1457 | ||
1458 | if (inline_version == 1 || /* initial version, no data */ | |
1459 | inline_version == CEPH_INLINE_NONE) | |
1460 | goto out; | |
1461 | ||
1462 | if (locked_page) { | |
1463 | page = locked_page; | |
1464 | WARN_ON(!PageUptodate(page)); | |
1465 | } else if (ceph_caps_issued(ci) & | |
1466 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { | |
1467 | page = find_get_page(inode->i_mapping, 0); | |
1468 | if (page) { | |
1469 | if (PageUptodate(page)) { | |
1470 | from_pagecache = true; | |
1471 | lock_page(page); | |
1472 | } else { | |
1473 | page_cache_release(page); | |
1474 | page = NULL; | |
1475 | } | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | if (page) { | |
1480 | len = i_size_read(inode); | |
1481 | if (len > PAGE_CACHE_SIZE) | |
1482 | len = PAGE_CACHE_SIZE; | |
1483 | } else { | |
1484 | page = __page_cache_alloc(GFP_NOFS); | |
1485 | if (!page) { | |
1486 | err = -ENOMEM; | |
1487 | goto out; | |
1488 | } | |
1489 | err = __ceph_do_getattr(inode, page, | |
1490 | CEPH_STAT_CAP_INLINE_DATA, true); | |
1491 | if (err < 0) { | |
1492 | /* no inline data */ | |
1493 | if (err == -ENODATA) | |
1494 | err = 0; | |
1495 | goto out; | |
1496 | } | |
1497 | len = err; | |
1498 | } | |
1499 | ||
1500 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1501 | ceph_vino(inode), 0, &len, 0, 1, | |
1502 | CEPH_OSD_OP_CREATE, | |
1503 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, | |
1504 | ci->i_snap_realm->cached_context, | |
1505 | 0, 0, false); | |
1506 | if (IS_ERR(req)) { | |
1507 | err = PTR_ERR(req); | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1511 | ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime); | |
1512 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
1513 | if (!err) | |
1514 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1515 | ceph_osdc_put_request(req); | |
1516 | if (err < 0) | |
1517 | goto out; | |
1518 | ||
1519 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1520 | ceph_vino(inode), 0, &len, 1, 3, | |
1521 | CEPH_OSD_OP_WRITE, | |
1522 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, | |
1523 | ci->i_snap_realm->cached_context, | |
1524 | ci->i_truncate_seq, ci->i_truncate_size, | |
1525 | false); | |
1526 | if (IS_ERR(req)) { | |
1527 | err = PTR_ERR(req); | |
1528 | goto out; | |
1529 | } | |
1530 | ||
1531 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); | |
1532 | ||
1533 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, | |
1534 | "inline_version", &inline_version, | |
1535 | sizeof(inline_version), | |
1536 | CEPH_OSD_CMPXATTR_OP_GT, | |
1537 | CEPH_OSD_CMPXATTR_MODE_U64); | |
1538 | if (err) | |
1539 | goto out_put; | |
1540 | ||
1541 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, | |
1542 | "inline_version", &inline_version, | |
1543 | sizeof(inline_version), 0, 0); | |
1544 | if (err) | |
1545 | goto out_put; | |
1546 | ||
1547 | ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime); | |
1548 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
1549 | if (!err) | |
1550 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1551 | out_put: | |
1552 | ceph_osdc_put_request(req); | |
1553 | if (err == -ECANCELED) | |
1554 | err = 0; | |
1555 | out: | |
1556 | if (page && page != locked_page) { | |
1557 | if (from_pagecache) { | |
1558 | unlock_page(page); | |
1559 | page_cache_release(page); | |
1560 | } else | |
1561 | __free_pages(page, 0); | |
1562 | } | |
1563 | ||
1564 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", | |
1565 | inode, ceph_vinop(inode), inline_version, err); | |
1566 | return err; | |
1567 | } | |
1568 | ||
1d3576fd | 1569 | static struct vm_operations_struct ceph_vmops = { |
61f68816 | 1570 | .fault = ceph_filemap_fault, |
1d3576fd | 1571 | .page_mkwrite = ceph_page_mkwrite, |
0b173bc4 | 1572 | .remap_pages = generic_file_remap_pages, |
1d3576fd SW |
1573 | }; |
1574 | ||
1575 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) | |
1576 | { | |
1577 | struct address_space *mapping = file->f_mapping; | |
1578 | ||
1579 | if (!mapping->a_ops->readpage) | |
1580 | return -ENOEXEC; | |
1581 | file_accessed(file); | |
1582 | vma->vm_ops = &ceph_vmops; | |
1d3576fd SW |
1583 | return 0; |
1584 | } |