| 1 | #include <linux/ceph/ceph_debug.h> |
| 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 */ |
| 8 | #include <linux/slab.h> |
| 9 | #include <linux/pagevec.h> |
| 10 | #include <linux/task_io_accounting_ops.h> |
| 11 | |
| 12 | #include "super.h" |
| 13 | #include "mds_client.h" |
| 14 | #include "cache.h" |
| 15 | #include <linux/ceph/osd_client.h> |
| 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 |
| 28 | * count dirty pages on the inode. In the absence of snapshots, |
| 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 | |
| 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 | |
| 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 | } |
| 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; |
| 74 | struct ceph_snap_context *snapc; |
| 75 | int ret; |
| 76 | |
| 77 | if (unlikely(!mapping)) |
| 78 | return !TestSetPageDirty(page); |
| 79 | |
| 80 | if (PageDirty(page)) { |
| 81 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
| 82 | mapping->host, page, page->index); |
| 83 | BUG_ON(!PagePrivate(page)); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | inode = mapping->host; |
| 88 | ci = ceph_inode(inode); |
| 89 | |
| 90 | /* dirty the head */ |
| 91 | spin_lock(&ci->i_ceph_lock); |
| 92 | BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference |
| 93 | if (__ceph_have_pending_cap_snap(ci)) { |
| 94 | struct ceph_cap_snap *capsnap = |
| 95 | list_last_entry(&ci->i_cap_snaps, |
| 96 | struct ceph_cap_snap, |
| 97 | ci_item); |
| 98 | snapc = ceph_get_snap_context(capsnap->context); |
| 99 | capsnap->dirty_pages++; |
| 100 | } else { |
| 101 | BUG_ON(!ci->i_head_snapc); |
| 102 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
| 103 | ++ci->i_wrbuffer_ref_head; |
| 104 | } |
| 105 | if (ci->i_wrbuffer_ref == 0) |
| 106 | ihold(inode); |
| 107 | ++ci->i_wrbuffer_ref; |
| 108 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " |
| 109 | "snapc %p seq %lld (%d snaps)\n", |
| 110 | mapping->host, page, page->index, |
| 111 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, |
| 112 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, |
| 113 | snapc, snapc->seq, snapc->num_snaps); |
| 114 | spin_unlock(&ci->i_ceph_lock); |
| 115 | |
| 116 | /* |
| 117 | * Reference snap context in page->private. Also set |
| 118 | * PagePrivate so that we get invalidatepage callback. |
| 119 | */ |
| 120 | BUG_ON(PagePrivate(page)); |
| 121 | page->private = (unsigned long)snapc; |
| 122 | SetPagePrivate(page); |
| 123 | |
| 124 | ret = __set_page_dirty_nobuffers(page); |
| 125 | WARN_ON(!PageLocked(page)); |
| 126 | WARN_ON(!page->mapping); |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * If we are truncating the full page (i.e. offset == 0), adjust the |
| 133 | * dirty page counters appropriately. Only called if there is private |
| 134 | * data on the page. |
| 135 | */ |
| 136 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
| 137 | unsigned int length) |
| 138 | { |
| 139 | struct inode *inode; |
| 140 | struct ceph_inode_info *ci; |
| 141 | struct ceph_snap_context *snapc = page_snap_context(page); |
| 142 | |
| 143 | inode = page->mapping->host; |
| 144 | ci = ceph_inode(inode); |
| 145 | |
| 146 | if (offset != 0 || length != PAGE_SIZE) { |
| 147 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
| 148 | inode, page, page->index, offset, length); |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | ceph_invalidate_fscache_page(inode, page); |
| 153 | |
| 154 | if (!PagePrivate(page)) |
| 155 | return; |
| 156 | |
| 157 | /* |
| 158 | * We can get non-dirty pages here due to races between |
| 159 | * set_page_dirty and truncate_complete_page; just spit out a |
| 160 | * warning, in case we end up with accounting problems later. |
| 161 | */ |
| 162 | if (!PageDirty(page)) |
| 163 | pr_err("%p invalidatepage %p page not dirty\n", inode, page); |
| 164 | |
| 165 | ClearPageChecked(page); |
| 166 | |
| 167 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
| 168 | inode, page, page->index); |
| 169 | |
| 170 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); |
| 171 | ceph_put_snap_context(snapc); |
| 172 | page->private = 0; |
| 173 | ClearPagePrivate(page); |
| 174 | } |
| 175 | |
| 176 | static int ceph_releasepage(struct page *page, gfp_t g) |
| 177 | { |
| 178 | dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, |
| 179 | page, page->index, PageDirty(page) ? "" : "not "); |
| 180 | |
| 181 | /* Can we release the page from the cache? */ |
| 182 | if (!ceph_release_fscache_page(page, g)) |
| 183 | return 0; |
| 184 | |
| 185 | return !PagePrivate(page); |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * read a single page, without unlocking it. |
| 190 | */ |
| 191 | static int readpage_nounlock(struct file *filp, struct page *page) |
| 192 | { |
| 193 | struct inode *inode = file_inode(filp); |
| 194 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 195 | struct ceph_osd_client *osdc = |
| 196 | &ceph_inode_to_client(inode)->client->osdc; |
| 197 | int err = 0; |
| 198 | u64 off = page_offset(page); |
| 199 | u64 len = PAGE_SIZE; |
| 200 | |
| 201 | if (off >= i_size_read(inode)) { |
| 202 | zero_user_segment(page, 0, PAGE_SIZE); |
| 203 | SetPageUptodate(page); |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
| 208 | /* |
| 209 | * Uptodate inline data should have been added |
| 210 | * into page cache while getting Fcr caps. |
| 211 | */ |
| 212 | if (off == 0) |
| 213 | return -EINVAL; |
| 214 | zero_user_segment(page, 0, PAGE_SIZE); |
| 215 | SetPageUptodate(page); |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | err = ceph_readpage_from_fscache(inode, page); |
| 220 | if (err == 0) |
| 221 | goto out; |
| 222 | |
| 223 | dout("readpage inode %p file %p page %p index %lu\n", |
| 224 | inode, filp, page, page->index); |
| 225 | err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, |
| 226 | off, &len, |
| 227 | ci->i_truncate_seq, ci->i_truncate_size, |
| 228 | &page, 1, 0); |
| 229 | if (err == -ENOENT) |
| 230 | err = 0; |
| 231 | if (err < 0) { |
| 232 | SetPageError(page); |
| 233 | ceph_fscache_readpage_cancel(inode, page); |
| 234 | goto out; |
| 235 | } |
| 236 | if (err < PAGE_SIZE) |
| 237 | /* zero fill remainder of page */ |
| 238 | zero_user_segment(page, err, PAGE_SIZE); |
| 239 | else |
| 240 | flush_dcache_page(page); |
| 241 | |
| 242 | SetPageUptodate(page); |
| 243 | ceph_readpage_to_fscache(inode, page); |
| 244 | |
| 245 | out: |
| 246 | return err < 0 ? err : 0; |
| 247 | } |
| 248 | |
| 249 | static int ceph_readpage(struct file *filp, struct page *page) |
| 250 | { |
| 251 | int r = readpage_nounlock(filp, page); |
| 252 | unlock_page(page); |
| 253 | return r; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Finish an async read(ahead) op. |
| 258 | */ |
| 259 | static void finish_read(struct ceph_osd_request *req) |
| 260 | { |
| 261 | struct inode *inode = req->r_inode; |
| 262 | struct ceph_osd_data *osd_data; |
| 263 | int rc = req->r_result <= 0 ? req->r_result : 0; |
| 264 | int bytes = req->r_result >= 0 ? req->r_result : 0; |
| 265 | int num_pages; |
| 266 | int i; |
| 267 | |
| 268 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
| 269 | |
| 270 | /* unlock all pages, zeroing any data we didn't read */ |
| 271 | osd_data = osd_req_op_extent_osd_data(req, 0); |
| 272 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
| 273 | num_pages = calc_pages_for((u64)osd_data->alignment, |
| 274 | (u64)osd_data->length); |
| 275 | for (i = 0; i < num_pages; i++) { |
| 276 | struct page *page = osd_data->pages[i]; |
| 277 | |
| 278 | if (rc < 0 && rc != -ENOENT) { |
| 279 | ceph_fscache_readpage_cancel(inode, page); |
| 280 | goto unlock; |
| 281 | } |
| 282 | if (bytes < (int)PAGE_SIZE) { |
| 283 | /* zero (remainder of) page */ |
| 284 | int s = bytes < 0 ? 0 : bytes; |
| 285 | zero_user_segment(page, s, PAGE_SIZE); |
| 286 | } |
| 287 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
| 288 | page->index); |
| 289 | flush_dcache_page(page); |
| 290 | SetPageUptodate(page); |
| 291 | ceph_readpage_to_fscache(inode, page); |
| 292 | unlock: |
| 293 | unlock_page(page); |
| 294 | put_page(page); |
| 295 | bytes -= PAGE_SIZE; |
| 296 | } |
| 297 | kfree(osd_data->pages); |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * start an async read(ahead) operation. return nr_pages we submitted |
| 302 | * a read for on success, or negative error code. |
| 303 | */ |
| 304 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
| 305 | { |
| 306 | struct ceph_osd_client *osdc = |
| 307 | &ceph_inode_to_client(inode)->client->osdc; |
| 308 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 309 | struct page *page = list_entry(page_list->prev, struct page, lru); |
| 310 | struct ceph_vino vino; |
| 311 | struct ceph_osd_request *req; |
| 312 | u64 off; |
| 313 | u64 len; |
| 314 | int i; |
| 315 | struct page **pages; |
| 316 | pgoff_t next_index; |
| 317 | int nr_pages = 0; |
| 318 | int got = 0; |
| 319 | int ret = 0; |
| 320 | |
| 321 | if (!current->journal_info) { |
| 322 | /* caller of readpages does not hold buffer and read caps |
| 323 | * (fadvise, madvise and readahead cases) */ |
| 324 | int want = CEPH_CAP_FILE_CACHE; |
| 325 | ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); |
| 326 | if (ret < 0) { |
| 327 | dout("start_read %p, error getting cap\n", inode); |
| 328 | } else if (!(got & want)) { |
| 329 | dout("start_read %p, no cache cap\n", inode); |
| 330 | ret = 0; |
| 331 | } |
| 332 | if (ret <= 0) { |
| 333 | if (got) |
| 334 | ceph_put_cap_refs(ci, got); |
| 335 | while (!list_empty(page_list)) { |
| 336 | page = list_entry(page_list->prev, |
| 337 | struct page, lru); |
| 338 | list_del(&page->lru); |
| 339 | put_page(page); |
| 340 | } |
| 341 | return ret; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | off = (u64) page_offset(page); |
| 346 | |
| 347 | /* count pages */ |
| 348 | next_index = page->index; |
| 349 | list_for_each_entry_reverse(page, page_list, lru) { |
| 350 | if (page->index != next_index) |
| 351 | break; |
| 352 | nr_pages++; |
| 353 | next_index++; |
| 354 | if (max && nr_pages == max) |
| 355 | break; |
| 356 | } |
| 357 | len = nr_pages << PAGE_SHIFT; |
| 358 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
| 359 | off, len); |
| 360 | vino = ceph_vino(inode); |
| 361 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, |
| 362 | 0, 1, CEPH_OSD_OP_READ, |
| 363 | CEPH_OSD_FLAG_READ, NULL, |
| 364 | ci->i_truncate_seq, ci->i_truncate_size, |
| 365 | false); |
| 366 | if (IS_ERR(req)) { |
| 367 | ret = PTR_ERR(req); |
| 368 | goto out; |
| 369 | } |
| 370 | |
| 371 | /* build page vector */ |
| 372 | nr_pages = calc_pages_for(0, len); |
| 373 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); |
| 374 | if (!pages) { |
| 375 | ret = -ENOMEM; |
| 376 | goto out_put; |
| 377 | } |
| 378 | for (i = 0; i < nr_pages; ++i) { |
| 379 | page = list_entry(page_list->prev, struct page, lru); |
| 380 | BUG_ON(PageLocked(page)); |
| 381 | list_del(&page->lru); |
| 382 | |
| 383 | dout("start_read %p adding %p idx %lu\n", inode, page, |
| 384 | page->index); |
| 385 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, |
| 386 | GFP_KERNEL)) { |
| 387 | ceph_fscache_uncache_page(inode, page); |
| 388 | put_page(page); |
| 389 | dout("start_read %p add_to_page_cache failed %p\n", |
| 390 | inode, page); |
| 391 | nr_pages = i; |
| 392 | if (nr_pages > 0) { |
| 393 | len = nr_pages << PAGE_SHIFT; |
| 394 | break; |
| 395 | } |
| 396 | goto out_pages; |
| 397 | } |
| 398 | pages[i] = page; |
| 399 | } |
| 400 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
| 401 | req->r_callback = finish_read; |
| 402 | req->r_inode = inode; |
| 403 | |
| 404 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); |
| 405 | ret = ceph_osdc_start_request(osdc, req, false); |
| 406 | if (ret < 0) |
| 407 | goto out_pages; |
| 408 | ceph_osdc_put_request(req); |
| 409 | |
| 410 | /* After adding locked pages to page cache, the inode holds cache cap. |
| 411 | * So we can drop our cap refs. */ |
| 412 | if (got) |
| 413 | ceph_put_cap_refs(ci, got); |
| 414 | |
| 415 | return nr_pages; |
| 416 | |
| 417 | out_pages: |
| 418 | for (i = 0; i < nr_pages; ++i) { |
| 419 | ceph_fscache_readpage_cancel(inode, pages[i]); |
| 420 | unlock_page(pages[i]); |
| 421 | } |
| 422 | ceph_put_page_vector(pages, nr_pages, false); |
| 423 | out_put: |
| 424 | ceph_osdc_put_request(req); |
| 425 | out: |
| 426 | if (got) |
| 427 | ceph_put_cap_refs(ci, got); |
| 428 | return ret; |
| 429 | } |
| 430 | |
| 431 | |
| 432 | /* |
| 433 | * Read multiple pages. Leave pages we don't read + unlock in page_list; |
| 434 | * the caller (VM) cleans them up. |
| 435 | */ |
| 436 | static int ceph_readpages(struct file *file, struct address_space *mapping, |
| 437 | struct list_head *page_list, unsigned nr_pages) |
| 438 | { |
| 439 | struct inode *inode = file_inode(file); |
| 440 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 441 | int rc = 0; |
| 442 | int max = 0; |
| 443 | |
| 444 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
| 445 | return -EINVAL; |
| 446 | |
| 447 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
| 448 | &nr_pages); |
| 449 | |
| 450 | if (rc == 0) |
| 451 | goto out; |
| 452 | |
| 453 | if (fsc->mount_options->rsize >= PAGE_SIZE) |
| 454 | max = (fsc->mount_options->rsize + PAGE_SIZE - 1) |
| 455 | >> PAGE_SHIFT; |
| 456 | |
| 457 | dout("readpages %p file %p nr_pages %d max %d\n", inode, |
| 458 | file, nr_pages, |
| 459 | max); |
| 460 | while (!list_empty(page_list)) { |
| 461 | rc = start_read(inode, page_list, max); |
| 462 | if (rc < 0) |
| 463 | goto out; |
| 464 | } |
| 465 | out: |
| 466 | ceph_fscache_readpages_cancel(inode, page_list); |
| 467 | |
| 468 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
| 469 | return rc; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Get ref for the oldest snapc for an inode with dirty data... that is, the |
| 474 | * only snap context we are allowed to write back. |
| 475 | */ |
| 476 | static struct ceph_snap_context *get_oldest_context(struct inode *inode, |
| 477 | loff_t *snap_size, |
| 478 | u64 *truncate_size, |
| 479 | u32 *truncate_seq) |
| 480 | { |
| 481 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 482 | struct ceph_snap_context *snapc = NULL; |
| 483 | struct ceph_cap_snap *capsnap = NULL; |
| 484 | |
| 485 | spin_lock(&ci->i_ceph_lock); |
| 486 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
| 487 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, |
| 488 | capsnap->context, capsnap->dirty_pages); |
| 489 | if (capsnap->dirty_pages) { |
| 490 | snapc = ceph_get_snap_context(capsnap->context); |
| 491 | if (snap_size) |
| 492 | *snap_size = capsnap->size; |
| 493 | if (truncate_size) |
| 494 | *truncate_size = capsnap->truncate_size; |
| 495 | if (truncate_seq) |
| 496 | *truncate_seq = capsnap->truncate_seq; |
| 497 | break; |
| 498 | } |
| 499 | } |
| 500 | if (!snapc && ci->i_wrbuffer_ref_head) { |
| 501 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
| 502 | dout(" head snapc %p has %d dirty pages\n", |
| 503 | snapc, ci->i_wrbuffer_ref_head); |
| 504 | if (truncate_size) |
| 505 | *truncate_size = ci->i_truncate_size; |
| 506 | if (truncate_seq) |
| 507 | *truncate_seq = ci->i_truncate_seq; |
| 508 | } |
| 509 | spin_unlock(&ci->i_ceph_lock); |
| 510 | return snapc; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * Write a single page, but leave the page locked. |
| 515 | * |
| 516 | * If we get a write error, set the page error bit, but still adjust the |
| 517 | * dirty page accounting (i.e., page is no longer dirty). |
| 518 | */ |
| 519 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) |
| 520 | { |
| 521 | struct inode *inode; |
| 522 | struct ceph_inode_info *ci; |
| 523 | struct ceph_fs_client *fsc; |
| 524 | struct ceph_osd_client *osdc; |
| 525 | struct ceph_snap_context *snapc, *oldest; |
| 526 | loff_t page_off = page_offset(page); |
| 527 | loff_t snap_size = -1; |
| 528 | long writeback_stat; |
| 529 | u64 truncate_size; |
| 530 | u32 truncate_seq; |
| 531 | int err = 0, len = PAGE_SIZE; |
| 532 | |
| 533 | dout("writepage %p idx %lu\n", page, page->index); |
| 534 | |
| 535 | if (!page->mapping || !page->mapping->host) { |
| 536 | dout("writepage %p - no mapping\n", page); |
| 537 | return -EFAULT; |
| 538 | } |
| 539 | inode = page->mapping->host; |
| 540 | ci = ceph_inode(inode); |
| 541 | fsc = ceph_inode_to_client(inode); |
| 542 | osdc = &fsc->client->osdc; |
| 543 | |
| 544 | /* verify this is a writeable snap context */ |
| 545 | snapc = page_snap_context(page); |
| 546 | if (snapc == NULL) { |
| 547 | dout("writepage %p page %p not dirty?\n", inode, page); |
| 548 | goto out; |
| 549 | } |
| 550 | oldest = get_oldest_context(inode, &snap_size, |
| 551 | &truncate_size, &truncate_seq); |
| 552 | if (snapc->seq > oldest->seq) { |
| 553 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
| 554 | inode, page, snapc); |
| 555 | /* we should only noop if called by kswapd */ |
| 556 | WARN_ON((current->flags & PF_MEMALLOC) == 0); |
| 557 | ceph_put_snap_context(oldest); |
| 558 | goto out; |
| 559 | } |
| 560 | ceph_put_snap_context(oldest); |
| 561 | |
| 562 | if (snap_size == -1) |
| 563 | snap_size = i_size_read(inode); |
| 564 | |
| 565 | /* is this a partial page at end of file? */ |
| 566 | if (page_off >= snap_size) { |
| 567 | dout("%p page eof %llu\n", page, snap_size); |
| 568 | goto out; |
| 569 | } |
| 570 | if (snap_size < page_off + len) |
| 571 | len = snap_size - page_off; |
| 572 | |
| 573 | dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", |
| 574 | inode, page, page->index, page_off, len, snapc); |
| 575 | |
| 576 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
| 577 | if (writeback_stat > |
| 578 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
| 579 | set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); |
| 580 | |
| 581 | set_page_writeback(page); |
| 582 | err = ceph_osdc_writepages(osdc, ceph_vino(inode), |
| 583 | &ci->i_layout, snapc, |
| 584 | page_off, len, |
| 585 | truncate_seq, truncate_size, |
| 586 | &inode->i_mtime, &page, 1); |
| 587 | if (err < 0) { |
| 588 | struct writeback_control tmp_wbc; |
| 589 | if (!wbc) |
| 590 | wbc = &tmp_wbc; |
| 591 | if (err == -ERESTARTSYS) { |
| 592 | /* killed by SIGKILL */ |
| 593 | dout("writepage interrupted page %p\n", page); |
| 594 | redirty_page_for_writepage(wbc, page); |
| 595 | end_page_writeback(page); |
| 596 | goto out; |
| 597 | } |
| 598 | dout("writepage setting page/mapping error %d %p\n", |
| 599 | err, page); |
| 600 | SetPageError(page); |
| 601 | mapping_set_error(&inode->i_data, err); |
| 602 | wbc->pages_skipped++; |
| 603 | } else { |
| 604 | dout("writepage cleaned page %p\n", page); |
| 605 | err = 0; /* vfs expects us to return 0 */ |
| 606 | } |
| 607 | page->private = 0; |
| 608 | ClearPagePrivate(page); |
| 609 | end_page_writeback(page); |
| 610 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); |
| 611 | ceph_put_snap_context(snapc); /* page's reference */ |
| 612 | out: |
| 613 | return err; |
| 614 | } |
| 615 | |
| 616 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) |
| 617 | { |
| 618 | int err; |
| 619 | struct inode *inode = page->mapping->host; |
| 620 | BUG_ON(!inode); |
| 621 | ihold(inode); |
| 622 | err = writepage_nounlock(page, wbc); |
| 623 | if (err == -ERESTARTSYS) { |
| 624 | /* direct memory reclaimer was killed by SIGKILL. return 0 |
| 625 | * to prevent caller from setting mapping/page error */ |
| 626 | err = 0; |
| 627 | } |
| 628 | unlock_page(page); |
| 629 | iput(inode); |
| 630 | return err; |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * lame release_pages helper. release_pages() isn't exported to |
| 635 | * modules. |
| 636 | */ |
| 637 | static void ceph_release_pages(struct page **pages, int num) |
| 638 | { |
| 639 | struct pagevec pvec; |
| 640 | int i; |
| 641 | |
| 642 | pagevec_init(&pvec, 0); |
| 643 | for (i = 0; i < num; i++) { |
| 644 | if (pagevec_add(&pvec, pages[i]) == 0) |
| 645 | pagevec_release(&pvec); |
| 646 | } |
| 647 | pagevec_release(&pvec); |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * async writeback completion handler. |
| 652 | * |
| 653 | * If we get an error, set the mapping error bit, but not the individual |
| 654 | * page error bits. |
| 655 | */ |
| 656 | static void writepages_finish(struct ceph_osd_request *req) |
| 657 | { |
| 658 | struct inode *inode = req->r_inode; |
| 659 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 660 | struct ceph_osd_data *osd_data; |
| 661 | struct page *page; |
| 662 | int num_pages, total_pages = 0; |
| 663 | int i, j; |
| 664 | int rc = req->r_result; |
| 665 | struct ceph_snap_context *snapc = req->r_snapc; |
| 666 | struct address_space *mapping = inode->i_mapping; |
| 667 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 668 | bool remove_page; |
| 669 | |
| 670 | dout("writepages_finish %p rc %d\n", inode, rc); |
| 671 | if (rc < 0) |
| 672 | mapping_set_error(mapping, rc); |
| 673 | |
| 674 | /* |
| 675 | * We lost the cache cap, need to truncate the page before |
| 676 | * it is unlocked, otherwise we'd truncate it later in the |
| 677 | * page truncation thread, possibly losing some data that |
| 678 | * raced its way in |
| 679 | */ |
| 680 | remove_page = !(ceph_caps_issued(ci) & |
| 681 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); |
| 682 | |
| 683 | /* clean all pages */ |
| 684 | for (i = 0; i < req->r_num_ops; i++) { |
| 685 | if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) |
| 686 | break; |
| 687 | |
| 688 | osd_data = osd_req_op_extent_osd_data(req, i); |
| 689 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
| 690 | num_pages = calc_pages_for((u64)osd_data->alignment, |
| 691 | (u64)osd_data->length); |
| 692 | total_pages += num_pages; |
| 693 | for (j = 0; j < num_pages; j++) { |
| 694 | page = osd_data->pages[j]; |
| 695 | BUG_ON(!page); |
| 696 | WARN_ON(!PageUptodate(page)); |
| 697 | |
| 698 | if (atomic_long_dec_return(&fsc->writeback_count) < |
| 699 | CONGESTION_OFF_THRESH( |
| 700 | fsc->mount_options->congestion_kb)) |
| 701 | clear_bdi_congested(&fsc->backing_dev_info, |
| 702 | BLK_RW_ASYNC); |
| 703 | |
| 704 | if (rc < 0) |
| 705 | SetPageError(page); |
| 706 | |
| 707 | ceph_put_snap_context(page_snap_context(page)); |
| 708 | page->private = 0; |
| 709 | ClearPagePrivate(page); |
| 710 | dout("unlocking %p\n", page); |
| 711 | end_page_writeback(page); |
| 712 | |
| 713 | if (remove_page) |
| 714 | generic_error_remove_page(inode->i_mapping, |
| 715 | page); |
| 716 | |
| 717 | unlock_page(page); |
| 718 | } |
| 719 | dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", |
| 720 | inode, osd_data->length, rc >= 0 ? num_pages : 0); |
| 721 | |
| 722 | ceph_release_pages(osd_data->pages, num_pages); |
| 723 | } |
| 724 | |
| 725 | ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); |
| 726 | |
| 727 | osd_data = osd_req_op_extent_osd_data(req, 0); |
| 728 | if (osd_data->pages_from_pool) |
| 729 | mempool_free(osd_data->pages, |
| 730 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
| 731 | else |
| 732 | kfree(osd_data->pages); |
| 733 | ceph_osdc_put_request(req); |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * initiate async writeback |
| 738 | */ |
| 739 | static int ceph_writepages_start(struct address_space *mapping, |
| 740 | struct writeback_control *wbc) |
| 741 | { |
| 742 | struct inode *inode = mapping->host; |
| 743 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 744 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 745 | struct ceph_vino vino = ceph_vino(inode); |
| 746 | pgoff_t index, start, end; |
| 747 | int range_whole = 0; |
| 748 | int should_loop = 1; |
| 749 | pgoff_t max_pages = 0, max_pages_ever = 0; |
| 750 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
| 751 | struct pagevec pvec; |
| 752 | int done = 0; |
| 753 | int rc = 0; |
| 754 | unsigned int wsize = i_blocksize(inode); |
| 755 | struct ceph_osd_request *req = NULL; |
| 756 | int do_sync = 0; |
| 757 | loff_t snap_size, i_size; |
| 758 | u64 truncate_size; |
| 759 | u32 truncate_seq; |
| 760 | |
| 761 | /* |
| 762 | * Include a 'sync' in the OSD request if this is a data |
| 763 | * integrity write (e.g., O_SYNC write or fsync()), or if our |
| 764 | * cap is being revoked. |
| 765 | */ |
| 766 | if ((wbc->sync_mode == WB_SYNC_ALL) || |
| 767 | ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) |
| 768 | do_sync = 1; |
| 769 | dout("writepages_start %p dosync=%d (mode=%s)\n", |
| 770 | inode, do_sync, |
| 771 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : |
| 772 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); |
| 773 | |
| 774 | if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
| 775 | if (ci->i_wrbuffer_ref > 0) { |
| 776 | pr_warn_ratelimited( |
| 777 | "writepage_start %p %lld forced umount\n", |
| 778 | inode, ceph_ino(inode)); |
| 779 | } |
| 780 | mapping_set_error(mapping, -EIO); |
| 781 | return -EIO; /* we're in a forced umount, don't write! */ |
| 782 | } |
| 783 | if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) |
| 784 | wsize = fsc->mount_options->wsize; |
| 785 | if (wsize < PAGE_SIZE) |
| 786 | wsize = PAGE_SIZE; |
| 787 | max_pages_ever = wsize >> PAGE_SHIFT; |
| 788 | |
| 789 | pagevec_init(&pvec, 0); |
| 790 | |
| 791 | /* where to start/end? */ |
| 792 | if (wbc->range_cyclic) { |
| 793 | start = mapping->writeback_index; /* Start from prev offset */ |
| 794 | end = -1; |
| 795 | dout(" cyclic, start at %lu\n", start); |
| 796 | } else { |
| 797 | start = wbc->range_start >> PAGE_SHIFT; |
| 798 | end = wbc->range_end >> PAGE_SHIFT; |
| 799 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 800 | range_whole = 1; |
| 801 | should_loop = 0; |
| 802 | dout(" not cyclic, %lu to %lu\n", start, end); |
| 803 | } |
| 804 | index = start; |
| 805 | |
| 806 | retry: |
| 807 | /* find oldest snap context with dirty data */ |
| 808 | ceph_put_snap_context(snapc); |
| 809 | snap_size = -1; |
| 810 | snapc = get_oldest_context(inode, &snap_size, |
| 811 | &truncate_size, &truncate_seq); |
| 812 | if (!snapc) { |
| 813 | /* hmm, why does writepages get called when there |
| 814 | is no dirty data? */ |
| 815 | dout(" no snap context with dirty data?\n"); |
| 816 | goto out; |
| 817 | } |
| 818 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", |
| 819 | snapc, snapc->seq, snapc->num_snaps); |
| 820 | |
| 821 | i_size = i_size_read(inode); |
| 822 | |
| 823 | if (last_snapc && snapc != last_snapc) { |
| 824 | /* if we switched to a newer snapc, restart our scan at the |
| 825 | * start of the original file range. */ |
| 826 | dout(" snapc differs from last pass, restarting at %lu\n", |
| 827 | index); |
| 828 | index = start; |
| 829 | } |
| 830 | last_snapc = snapc; |
| 831 | |
| 832 | while (!done && index <= end) { |
| 833 | unsigned i; |
| 834 | int first; |
| 835 | pgoff_t strip_unit_end = 0; |
| 836 | int num_ops = 0, op_idx; |
| 837 | int pvec_pages, locked_pages = 0; |
| 838 | struct page **pages = NULL, **data_pages; |
| 839 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
| 840 | struct page *page; |
| 841 | int want; |
| 842 | u64 offset = 0, len = 0; |
| 843 | |
| 844 | max_pages = max_pages_ever; |
| 845 | |
| 846 | get_more_pages: |
| 847 | first = -1; |
| 848 | want = min(end - index, |
| 849 | min((pgoff_t)PAGEVEC_SIZE, |
| 850 | max_pages - (pgoff_t)locked_pages) - 1) |
| 851 | + 1; |
| 852 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 853 | PAGECACHE_TAG_DIRTY, |
| 854 | want); |
| 855 | dout("pagevec_lookup_tag got %d\n", pvec_pages); |
| 856 | if (!pvec_pages && !locked_pages) |
| 857 | break; |
| 858 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { |
| 859 | page = pvec.pages[i]; |
| 860 | dout("? %p idx %lu\n", page, page->index); |
| 861 | if (locked_pages == 0) |
| 862 | lock_page(page); /* first page */ |
| 863 | else if (!trylock_page(page)) |
| 864 | break; |
| 865 | |
| 866 | /* only dirty pages, or our accounting breaks */ |
| 867 | if (unlikely(!PageDirty(page)) || |
| 868 | unlikely(page->mapping != mapping)) { |
| 869 | dout("!dirty or !mapping %p\n", page); |
| 870 | unlock_page(page); |
| 871 | break; |
| 872 | } |
| 873 | if (!wbc->range_cyclic && page->index > end) { |
| 874 | dout("end of range %p\n", page); |
| 875 | done = 1; |
| 876 | unlock_page(page); |
| 877 | break; |
| 878 | } |
| 879 | if (strip_unit_end && (page->index > strip_unit_end)) { |
| 880 | dout("end of strip unit %p\n", page); |
| 881 | unlock_page(page); |
| 882 | break; |
| 883 | } |
| 884 | if (wbc->sync_mode != WB_SYNC_NONE) { |
| 885 | dout("waiting on writeback %p\n", page); |
| 886 | wait_on_page_writeback(page); |
| 887 | } |
| 888 | if (page_offset(page) >= |
| 889 | (snap_size == -1 ? i_size : snap_size)) { |
| 890 | dout("%p page eof %llu\n", page, |
| 891 | (snap_size == -1 ? i_size : snap_size)); |
| 892 | done = 1; |
| 893 | unlock_page(page); |
| 894 | break; |
| 895 | } |
| 896 | if (PageWriteback(page)) { |
| 897 | dout("%p under writeback\n", page); |
| 898 | unlock_page(page); |
| 899 | break; |
| 900 | } |
| 901 | |
| 902 | /* only if matching snap context */ |
| 903 | pgsnapc = page_snap_context(page); |
| 904 | if (pgsnapc->seq > snapc->seq) { |
| 905 | dout("page snapc %p %lld > oldest %p %lld\n", |
| 906 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); |
| 907 | unlock_page(page); |
| 908 | if (!locked_pages) |
| 909 | continue; /* keep looking for snap */ |
| 910 | break; |
| 911 | } |
| 912 | |
| 913 | if (!clear_page_dirty_for_io(page)) { |
| 914 | dout("%p !clear_page_dirty_for_io\n", page); |
| 915 | unlock_page(page); |
| 916 | break; |
| 917 | } |
| 918 | |
| 919 | /* |
| 920 | * We have something to write. If this is |
| 921 | * the first locked page this time through, |
| 922 | * calculate max possinle write size and |
| 923 | * allocate a page array |
| 924 | */ |
| 925 | if (locked_pages == 0) { |
| 926 | u64 objnum; |
| 927 | u64 objoff; |
| 928 | |
| 929 | /* prepare async write request */ |
| 930 | offset = (u64)page_offset(page); |
| 931 | len = wsize; |
| 932 | |
| 933 | rc = ceph_calc_file_object_mapping(&ci->i_layout, |
| 934 | offset, len, |
| 935 | &objnum, &objoff, |
| 936 | &len); |
| 937 | if (rc < 0) { |
| 938 | unlock_page(page); |
| 939 | break; |
| 940 | } |
| 941 | |
| 942 | num_ops = 1 + do_sync; |
| 943 | strip_unit_end = page->index + |
| 944 | ((len - 1) >> PAGE_SHIFT); |
| 945 | |
| 946 | BUG_ON(pages); |
| 947 | max_pages = calc_pages_for(0, (u64)len); |
| 948 | pages = kmalloc(max_pages * sizeof (*pages), |
| 949 | GFP_NOFS); |
| 950 | if (!pages) { |
| 951 | pool = fsc->wb_pagevec_pool; |
| 952 | pages = mempool_alloc(pool, GFP_NOFS); |
| 953 | BUG_ON(!pages); |
| 954 | } |
| 955 | |
| 956 | len = 0; |
| 957 | } else if (page->index != |
| 958 | (offset + len) >> PAGE_SHIFT) { |
| 959 | if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : |
| 960 | CEPH_OSD_MAX_OPS)) { |
| 961 | redirty_page_for_writepage(wbc, page); |
| 962 | unlock_page(page); |
| 963 | break; |
| 964 | } |
| 965 | |
| 966 | num_ops++; |
| 967 | offset = (u64)page_offset(page); |
| 968 | len = 0; |
| 969 | } |
| 970 | |
| 971 | /* note position of first page in pvec */ |
| 972 | if (first < 0) |
| 973 | first = i; |
| 974 | dout("%p will write page %p idx %lu\n", |
| 975 | inode, page, page->index); |
| 976 | |
| 977 | if (atomic_long_inc_return(&fsc->writeback_count) > |
| 978 | CONGESTION_ON_THRESH( |
| 979 | fsc->mount_options->congestion_kb)) { |
| 980 | set_bdi_congested(&fsc->backing_dev_info, |
| 981 | BLK_RW_ASYNC); |
| 982 | } |
| 983 | |
| 984 | pages[locked_pages] = page; |
| 985 | locked_pages++; |
| 986 | len += PAGE_SIZE; |
| 987 | } |
| 988 | |
| 989 | /* did we get anything? */ |
| 990 | if (!locked_pages) |
| 991 | goto release_pvec_pages; |
| 992 | if (i) { |
| 993 | int j; |
| 994 | BUG_ON(!locked_pages || first < 0); |
| 995 | |
| 996 | if (pvec_pages && i == pvec_pages && |
| 997 | locked_pages < max_pages) { |
| 998 | dout("reached end pvec, trying for more\n"); |
| 999 | pagevec_reinit(&pvec); |
| 1000 | goto get_more_pages; |
| 1001 | } |
| 1002 | |
| 1003 | /* shift unused pages over in the pvec... we |
| 1004 | * will need to release them below. */ |
| 1005 | for (j = i; j < pvec_pages; j++) { |
| 1006 | dout(" pvec leftover page %p\n", pvec.pages[j]); |
| 1007 | pvec.pages[j-i+first] = pvec.pages[j]; |
| 1008 | } |
| 1009 | pvec.nr -= i-first; |
| 1010 | } |
| 1011 | |
| 1012 | new_request: |
| 1013 | offset = page_offset(pages[0]); |
| 1014 | len = wsize; |
| 1015 | |
| 1016 | req = ceph_osdc_new_request(&fsc->client->osdc, |
| 1017 | &ci->i_layout, vino, |
| 1018 | offset, &len, 0, num_ops, |
| 1019 | CEPH_OSD_OP_WRITE, |
| 1020 | CEPH_OSD_FLAG_WRITE | |
| 1021 | CEPH_OSD_FLAG_ONDISK, |
| 1022 | snapc, truncate_seq, |
| 1023 | truncate_size, false); |
| 1024 | if (IS_ERR(req)) { |
| 1025 | req = ceph_osdc_new_request(&fsc->client->osdc, |
| 1026 | &ci->i_layout, vino, |
| 1027 | offset, &len, 0, |
| 1028 | min(num_ops, |
| 1029 | CEPH_OSD_SLAB_OPS), |
| 1030 | CEPH_OSD_OP_WRITE, |
| 1031 | CEPH_OSD_FLAG_WRITE | |
| 1032 | CEPH_OSD_FLAG_ONDISK, |
| 1033 | snapc, truncate_seq, |
| 1034 | truncate_size, true); |
| 1035 | BUG_ON(IS_ERR(req)); |
| 1036 | } |
| 1037 | BUG_ON(len < page_offset(pages[locked_pages - 1]) + |
| 1038 | PAGE_SIZE - offset); |
| 1039 | |
| 1040 | req->r_callback = writepages_finish; |
| 1041 | req->r_inode = inode; |
| 1042 | |
| 1043 | /* Format the osd request message and submit the write */ |
| 1044 | len = 0; |
| 1045 | data_pages = pages; |
| 1046 | op_idx = 0; |
| 1047 | for (i = 0; i < locked_pages; i++) { |
| 1048 | u64 cur_offset = page_offset(pages[i]); |
| 1049 | if (offset + len != cur_offset) { |
| 1050 | if (op_idx + do_sync + 1 == req->r_num_ops) |
| 1051 | break; |
| 1052 | osd_req_op_extent_dup_last(req, op_idx, |
| 1053 | cur_offset - offset); |
| 1054 | dout("writepages got pages at %llu~%llu\n", |
| 1055 | offset, len); |
| 1056 | osd_req_op_extent_osd_data_pages(req, op_idx, |
| 1057 | data_pages, len, 0, |
| 1058 | !!pool, false); |
| 1059 | osd_req_op_extent_update(req, op_idx, len); |
| 1060 | |
| 1061 | len = 0; |
| 1062 | offset = cur_offset; |
| 1063 | data_pages = pages + i; |
| 1064 | op_idx++; |
| 1065 | } |
| 1066 | |
| 1067 | set_page_writeback(pages[i]); |
| 1068 | len += PAGE_SIZE; |
| 1069 | } |
| 1070 | |
| 1071 | if (snap_size != -1) { |
| 1072 | len = min(len, snap_size - offset); |
| 1073 | } else if (i == locked_pages) { |
| 1074 | /* writepages_finish() clears writeback pages |
| 1075 | * according to the data length, so make sure |
| 1076 | * data length covers all locked pages */ |
| 1077 | u64 min_len = len + 1 - PAGE_SIZE; |
| 1078 | len = min(len, (u64)i_size_read(inode) - offset); |
| 1079 | len = max(len, min_len); |
| 1080 | } |
| 1081 | dout("writepages got pages at %llu~%llu\n", offset, len); |
| 1082 | |
| 1083 | osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, |
| 1084 | 0, !!pool, false); |
| 1085 | osd_req_op_extent_update(req, op_idx, len); |
| 1086 | |
| 1087 | if (do_sync) { |
| 1088 | op_idx++; |
| 1089 | osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); |
| 1090 | } |
| 1091 | BUG_ON(op_idx + 1 != req->r_num_ops); |
| 1092 | |
| 1093 | pool = NULL; |
| 1094 | if (i < locked_pages) { |
| 1095 | BUG_ON(num_ops <= req->r_num_ops); |
| 1096 | num_ops -= req->r_num_ops; |
| 1097 | num_ops += do_sync; |
| 1098 | locked_pages -= i; |
| 1099 | |
| 1100 | /* allocate new pages array for next request */ |
| 1101 | data_pages = pages; |
| 1102 | pages = kmalloc(locked_pages * sizeof (*pages), |
| 1103 | GFP_NOFS); |
| 1104 | if (!pages) { |
| 1105 | pool = fsc->wb_pagevec_pool; |
| 1106 | pages = mempool_alloc(pool, GFP_NOFS); |
| 1107 | BUG_ON(!pages); |
| 1108 | } |
| 1109 | memcpy(pages, data_pages + i, |
| 1110 | locked_pages * sizeof(*pages)); |
| 1111 | memset(data_pages + i, 0, |
| 1112 | locked_pages * sizeof(*pages)); |
| 1113 | } else { |
| 1114 | BUG_ON(num_ops != req->r_num_ops); |
| 1115 | index = pages[i - 1]->index + 1; |
| 1116 | /* request message now owns the pages array */ |
| 1117 | pages = NULL; |
| 1118 | } |
| 1119 | |
| 1120 | req->r_mtime = inode->i_mtime; |
| 1121 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
| 1122 | BUG_ON(rc); |
| 1123 | req = NULL; |
| 1124 | |
| 1125 | wbc->nr_to_write -= i; |
| 1126 | if (pages) |
| 1127 | goto new_request; |
| 1128 | |
| 1129 | if (wbc->nr_to_write <= 0) |
| 1130 | done = 1; |
| 1131 | |
| 1132 | release_pvec_pages: |
| 1133 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, |
| 1134 | pvec.nr ? pvec.pages[0] : NULL); |
| 1135 | pagevec_release(&pvec); |
| 1136 | |
| 1137 | if (locked_pages && !done) |
| 1138 | goto retry; |
| 1139 | } |
| 1140 | |
| 1141 | if (should_loop && !done) { |
| 1142 | /* more to do; loop back to beginning of file */ |
| 1143 | dout("writepages looping back to beginning of file\n"); |
| 1144 | should_loop = 0; |
| 1145 | index = 0; |
| 1146 | goto retry; |
| 1147 | } |
| 1148 | |
| 1149 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
| 1150 | mapping->writeback_index = index; |
| 1151 | |
| 1152 | out: |
| 1153 | ceph_osdc_put_request(req); |
| 1154 | ceph_put_snap_context(snapc); |
| 1155 | dout("writepages done, rc = %d\n", rc); |
| 1156 | return rc; |
| 1157 | } |
| 1158 | |
| 1159 | |
| 1160 | |
| 1161 | /* |
| 1162 | * See if a given @snapc is either writeable, or already written. |
| 1163 | */ |
| 1164 | static int context_is_writeable_or_written(struct inode *inode, |
| 1165 | struct ceph_snap_context *snapc) |
| 1166 | { |
| 1167 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, |
| 1168 | NULL, NULL); |
| 1169 | int ret = !oldest || snapc->seq <= oldest->seq; |
| 1170 | |
| 1171 | ceph_put_snap_context(oldest); |
| 1172 | return ret; |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * We are only allowed to write into/dirty the page if the page is |
| 1177 | * clean, or already dirty within the same snap context. |
| 1178 | * |
| 1179 | * called with page locked. |
| 1180 | * return success with page locked, |
| 1181 | * or any failure (incl -EAGAIN) with page unlocked. |
| 1182 | */ |
| 1183 | static int ceph_update_writeable_page(struct file *file, |
| 1184 | loff_t pos, unsigned len, |
| 1185 | struct page *page) |
| 1186 | { |
| 1187 | struct inode *inode = file_inode(file); |
| 1188 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 1189 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1190 | loff_t page_off = pos & PAGE_MASK; |
| 1191 | int pos_in_page = pos & ~PAGE_MASK; |
| 1192 | int end_in_page = pos_in_page + len; |
| 1193 | loff_t i_size; |
| 1194 | int r; |
| 1195 | struct ceph_snap_context *snapc, *oldest; |
| 1196 | |
| 1197 | if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
| 1198 | dout(" page %p forced umount\n", page); |
| 1199 | unlock_page(page); |
| 1200 | return -EIO; |
| 1201 | } |
| 1202 | |
| 1203 | retry_locked: |
| 1204 | /* writepages currently holds page lock, but if we change that later, */ |
| 1205 | wait_on_page_writeback(page); |
| 1206 | |
| 1207 | snapc = page_snap_context(page); |
| 1208 | if (snapc && snapc != ci->i_head_snapc) { |
| 1209 | /* |
| 1210 | * this page is already dirty in another (older) snap |
| 1211 | * context! is it writeable now? |
| 1212 | */ |
| 1213 | oldest = get_oldest_context(inode, NULL, NULL, NULL); |
| 1214 | |
| 1215 | if (snapc->seq > oldest->seq) { |
| 1216 | ceph_put_snap_context(oldest); |
| 1217 | dout(" page %p snapc %p not current or oldest\n", |
| 1218 | page, snapc); |
| 1219 | /* |
| 1220 | * queue for writeback, and wait for snapc to |
| 1221 | * be writeable or written |
| 1222 | */ |
| 1223 | snapc = ceph_get_snap_context(snapc); |
| 1224 | unlock_page(page); |
| 1225 | ceph_queue_writeback(inode); |
| 1226 | r = wait_event_killable(ci->i_cap_wq, |
| 1227 | context_is_writeable_or_written(inode, snapc)); |
| 1228 | ceph_put_snap_context(snapc); |
| 1229 | if (r == -ERESTARTSYS) |
| 1230 | return r; |
| 1231 | return -EAGAIN; |
| 1232 | } |
| 1233 | ceph_put_snap_context(oldest); |
| 1234 | |
| 1235 | /* yay, writeable, do it now (without dropping page lock) */ |
| 1236 | dout(" page %p snapc %p not current, but oldest\n", |
| 1237 | page, snapc); |
| 1238 | if (!clear_page_dirty_for_io(page)) |
| 1239 | goto retry_locked; |
| 1240 | r = writepage_nounlock(page, NULL); |
| 1241 | if (r < 0) |
| 1242 | goto fail_nosnap; |
| 1243 | goto retry_locked; |
| 1244 | } |
| 1245 | |
| 1246 | if (PageUptodate(page)) { |
| 1247 | dout(" page %p already uptodate\n", page); |
| 1248 | return 0; |
| 1249 | } |
| 1250 | |
| 1251 | /* full page? */ |
| 1252 | if (pos_in_page == 0 && len == PAGE_SIZE) |
| 1253 | return 0; |
| 1254 | |
| 1255 | /* past end of file? */ |
| 1256 | i_size = i_size_read(inode); |
| 1257 | |
| 1258 | if (page_off >= i_size || |
| 1259 | (pos_in_page == 0 && (pos+len) >= i_size && |
| 1260 | end_in_page - pos_in_page != PAGE_SIZE)) { |
| 1261 | dout(" zeroing %p 0 - %d and %d - %d\n", |
| 1262 | page, pos_in_page, end_in_page, (int)PAGE_SIZE); |
| 1263 | zero_user_segments(page, |
| 1264 | 0, pos_in_page, |
| 1265 | end_in_page, PAGE_SIZE); |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | /* we need to read it. */ |
| 1270 | r = readpage_nounlock(file, page); |
| 1271 | if (r < 0) |
| 1272 | goto fail_nosnap; |
| 1273 | goto retry_locked; |
| 1274 | fail_nosnap: |
| 1275 | unlock_page(page); |
| 1276 | return r; |
| 1277 | } |
| 1278 | |
| 1279 | /* |
| 1280 | * We are only allowed to write into/dirty the page if the page is |
| 1281 | * clean, or already dirty within the same snap context. |
| 1282 | */ |
| 1283 | static int ceph_write_begin(struct file *file, struct address_space *mapping, |
| 1284 | loff_t pos, unsigned len, unsigned flags, |
| 1285 | struct page **pagep, void **fsdata) |
| 1286 | { |
| 1287 | struct inode *inode = file_inode(file); |
| 1288 | struct page *page; |
| 1289 | pgoff_t index = pos >> PAGE_SHIFT; |
| 1290 | int r; |
| 1291 | |
| 1292 | do { |
| 1293 | /* get a page */ |
| 1294 | page = grab_cache_page_write_begin(mapping, index, 0); |
| 1295 | if (!page) |
| 1296 | return -ENOMEM; |
| 1297 | |
| 1298 | dout("write_begin file %p inode %p page %p %d~%d\n", file, |
| 1299 | inode, page, (int)pos, (int)len); |
| 1300 | |
| 1301 | r = ceph_update_writeable_page(file, pos, len, page); |
| 1302 | if (r < 0) |
| 1303 | put_page(page); |
| 1304 | else |
| 1305 | *pagep = page; |
| 1306 | } while (r == -EAGAIN); |
| 1307 | |
| 1308 | return r; |
| 1309 | } |
| 1310 | |
| 1311 | /* |
| 1312 | * we don't do anything in here that simple_write_end doesn't do |
| 1313 | * except adjust dirty page accounting |
| 1314 | */ |
| 1315 | static int ceph_write_end(struct file *file, struct address_space *mapping, |
| 1316 | loff_t pos, unsigned len, unsigned copied, |
| 1317 | struct page *page, void *fsdata) |
| 1318 | { |
| 1319 | struct inode *inode = file_inode(file); |
| 1320 | int check_cap = 0; |
| 1321 | |
| 1322 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, |
| 1323 | inode, page, (int)pos, (int)copied, (int)len); |
| 1324 | |
| 1325 | /* zero the stale part of the page if we did a short copy */ |
| 1326 | if (!PageUptodate(page)) { |
| 1327 | if (copied < len) { |
| 1328 | copied = 0; |
| 1329 | goto out; |
| 1330 | } |
| 1331 | SetPageUptodate(page); |
| 1332 | } |
| 1333 | |
| 1334 | /* did file size increase? */ |
| 1335 | if (pos+copied > i_size_read(inode)) |
| 1336 | check_cap = ceph_inode_set_size(inode, pos+copied); |
| 1337 | |
| 1338 | set_page_dirty(page); |
| 1339 | |
| 1340 | out: |
| 1341 | unlock_page(page); |
| 1342 | put_page(page); |
| 1343 | |
| 1344 | if (check_cap) |
| 1345 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); |
| 1346 | |
| 1347 | return copied; |
| 1348 | } |
| 1349 | |
| 1350 | /* |
| 1351 | * we set .direct_IO to indicate direct io is supported, but since we |
| 1352 | * intercept O_DIRECT reads and writes early, this function should |
| 1353 | * never get called. |
| 1354 | */ |
| 1355 | static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
| 1356 | { |
| 1357 | WARN_ON(1); |
| 1358 | return -EINVAL; |
| 1359 | } |
| 1360 | |
| 1361 | const struct address_space_operations ceph_aops = { |
| 1362 | .readpage = ceph_readpage, |
| 1363 | .readpages = ceph_readpages, |
| 1364 | .writepage = ceph_writepage, |
| 1365 | .writepages = ceph_writepages_start, |
| 1366 | .write_begin = ceph_write_begin, |
| 1367 | .write_end = ceph_write_end, |
| 1368 | .set_page_dirty = ceph_set_page_dirty, |
| 1369 | .invalidatepage = ceph_invalidatepage, |
| 1370 | .releasepage = ceph_releasepage, |
| 1371 | .direct_IO = ceph_direct_io, |
| 1372 | }; |
| 1373 | |
| 1374 | static void ceph_block_sigs(sigset_t *oldset) |
| 1375 | { |
| 1376 | sigset_t mask; |
| 1377 | siginitsetinv(&mask, sigmask(SIGKILL)); |
| 1378 | sigprocmask(SIG_BLOCK, &mask, oldset); |
| 1379 | } |
| 1380 | |
| 1381 | static void ceph_restore_sigs(sigset_t *oldset) |
| 1382 | { |
| 1383 | sigprocmask(SIG_SETMASK, oldset, NULL); |
| 1384 | } |
| 1385 | |
| 1386 | /* |
| 1387 | * vm ops |
| 1388 | */ |
| 1389 | static int ceph_filemap_fault(struct vm_fault *vmf) |
| 1390 | { |
| 1391 | struct vm_area_struct *vma = vmf->vma; |
| 1392 | struct inode *inode = file_inode(vma->vm_file); |
| 1393 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1394 | struct ceph_file_info *fi = vma->vm_file->private_data; |
| 1395 | struct page *pinned_page = NULL; |
| 1396 | loff_t off = vmf->pgoff << PAGE_SHIFT; |
| 1397 | int want, got, ret; |
| 1398 | sigset_t oldset; |
| 1399 | |
| 1400 | ceph_block_sigs(&oldset); |
| 1401 | |
| 1402 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", |
| 1403 | inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); |
| 1404 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
| 1405 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; |
| 1406 | else |
| 1407 | want = CEPH_CAP_FILE_CACHE; |
| 1408 | |
| 1409 | got = 0; |
| 1410 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); |
| 1411 | if (ret < 0) |
| 1412 | goto out_restore; |
| 1413 | |
| 1414 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
| 1415 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); |
| 1416 | |
| 1417 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
| 1418 | ci->i_inline_version == CEPH_INLINE_NONE) { |
| 1419 | current->journal_info = vma->vm_file; |
| 1420 | ret = filemap_fault(vmf); |
| 1421 | current->journal_info = NULL; |
| 1422 | } else |
| 1423 | ret = -EAGAIN; |
| 1424 | |
| 1425 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", |
| 1426 | inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); |
| 1427 | if (pinned_page) |
| 1428 | put_page(pinned_page); |
| 1429 | ceph_put_cap_refs(ci, got); |
| 1430 | |
| 1431 | if (ret != -EAGAIN) |
| 1432 | goto out_restore; |
| 1433 | |
| 1434 | /* read inline data */ |
| 1435 | if (off >= PAGE_SIZE) { |
| 1436 | /* does not support inline data > PAGE_SIZE */ |
| 1437 | ret = VM_FAULT_SIGBUS; |
| 1438 | } else { |
| 1439 | int ret1; |
| 1440 | struct address_space *mapping = inode->i_mapping; |
| 1441 | struct page *page = find_or_create_page(mapping, 0, |
| 1442 | mapping_gfp_constraint(mapping, |
| 1443 | ~__GFP_FS)); |
| 1444 | if (!page) { |
| 1445 | ret = VM_FAULT_OOM; |
| 1446 | goto out_inline; |
| 1447 | } |
| 1448 | ret1 = __ceph_do_getattr(inode, page, |
| 1449 | CEPH_STAT_CAP_INLINE_DATA, true); |
| 1450 | if (ret1 < 0 || off >= i_size_read(inode)) { |
| 1451 | unlock_page(page); |
| 1452 | put_page(page); |
| 1453 | if (ret1 < 0) |
| 1454 | ret = ret1; |
| 1455 | else |
| 1456 | ret = VM_FAULT_SIGBUS; |
| 1457 | goto out_inline; |
| 1458 | } |
| 1459 | if (ret1 < PAGE_SIZE) |
| 1460 | zero_user_segment(page, ret1, PAGE_SIZE); |
| 1461 | else |
| 1462 | flush_dcache_page(page); |
| 1463 | SetPageUptodate(page); |
| 1464 | vmf->page = page; |
| 1465 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; |
| 1466 | out_inline: |
| 1467 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", |
| 1468 | inode, off, (size_t)PAGE_SIZE, ret); |
| 1469 | } |
| 1470 | out_restore: |
| 1471 | ceph_restore_sigs(&oldset); |
| 1472 | if (ret < 0) |
| 1473 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; |
| 1474 | |
| 1475 | return ret; |
| 1476 | } |
| 1477 | |
| 1478 | /* |
| 1479 | * Reuse write_begin here for simplicity. |
| 1480 | */ |
| 1481 | static int ceph_page_mkwrite(struct vm_fault *vmf) |
| 1482 | { |
| 1483 | struct vm_area_struct *vma = vmf->vma; |
| 1484 | struct inode *inode = file_inode(vma->vm_file); |
| 1485 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1486 | struct ceph_file_info *fi = vma->vm_file->private_data; |
| 1487 | struct ceph_cap_flush *prealloc_cf; |
| 1488 | struct page *page = vmf->page; |
| 1489 | loff_t off = page_offset(page); |
| 1490 | loff_t size = i_size_read(inode); |
| 1491 | size_t len; |
| 1492 | int want, got, ret; |
| 1493 | sigset_t oldset; |
| 1494 | |
| 1495 | prealloc_cf = ceph_alloc_cap_flush(); |
| 1496 | if (!prealloc_cf) |
| 1497 | return VM_FAULT_OOM; |
| 1498 | |
| 1499 | ceph_block_sigs(&oldset); |
| 1500 | |
| 1501 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
| 1502 | struct page *locked_page = NULL; |
| 1503 | if (off == 0) { |
| 1504 | lock_page(page); |
| 1505 | locked_page = page; |
| 1506 | } |
| 1507 | ret = ceph_uninline_data(vma->vm_file, locked_page); |
| 1508 | if (locked_page) |
| 1509 | unlock_page(locked_page); |
| 1510 | if (ret < 0) |
| 1511 | goto out_free; |
| 1512 | } |
| 1513 | |
| 1514 | if (off + PAGE_SIZE <= size) |
| 1515 | len = PAGE_SIZE; |
| 1516 | else |
| 1517 | len = size & ~PAGE_MASK; |
| 1518 | |
| 1519 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
| 1520 | inode, ceph_vinop(inode), off, len, size); |
| 1521 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
| 1522 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; |
| 1523 | else |
| 1524 | want = CEPH_CAP_FILE_BUFFER; |
| 1525 | |
| 1526 | got = 0; |
| 1527 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, |
| 1528 | &got, NULL); |
| 1529 | if (ret < 0) |
| 1530 | goto out_free; |
| 1531 | |
| 1532 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
| 1533 | inode, off, len, ceph_cap_string(got)); |
| 1534 | |
| 1535 | /* Update time before taking page lock */ |
| 1536 | file_update_time(vma->vm_file); |
| 1537 | |
| 1538 | do { |
| 1539 | lock_page(page); |
| 1540 | |
| 1541 | if ((off > size) || (page->mapping != inode->i_mapping)) { |
| 1542 | unlock_page(page); |
| 1543 | ret = VM_FAULT_NOPAGE; |
| 1544 | break; |
| 1545 | } |
| 1546 | |
| 1547 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); |
| 1548 | if (ret >= 0) { |
| 1549 | /* success. we'll keep the page locked. */ |
| 1550 | set_page_dirty(page); |
| 1551 | ret = VM_FAULT_LOCKED; |
| 1552 | } |
| 1553 | } while (ret == -EAGAIN); |
| 1554 | |
| 1555 | if (ret == VM_FAULT_LOCKED || |
| 1556 | ci->i_inline_version != CEPH_INLINE_NONE) { |
| 1557 | int dirty; |
| 1558 | spin_lock(&ci->i_ceph_lock); |
| 1559 | ci->i_inline_version = CEPH_INLINE_NONE; |
| 1560 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
| 1561 | &prealloc_cf); |
| 1562 | spin_unlock(&ci->i_ceph_lock); |
| 1563 | if (dirty) |
| 1564 | __mark_inode_dirty(inode, dirty); |
| 1565 | } |
| 1566 | |
| 1567 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", |
| 1568 | inode, off, len, ceph_cap_string(got), ret); |
| 1569 | ceph_put_cap_refs(ci, got); |
| 1570 | out_free: |
| 1571 | ceph_restore_sigs(&oldset); |
| 1572 | ceph_free_cap_flush(prealloc_cf); |
| 1573 | if (ret < 0) |
| 1574 | ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; |
| 1575 | return ret; |
| 1576 | } |
| 1577 | |
| 1578 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
| 1579 | char *data, size_t len) |
| 1580 | { |
| 1581 | struct address_space *mapping = inode->i_mapping; |
| 1582 | struct page *page; |
| 1583 | |
| 1584 | if (locked_page) { |
| 1585 | page = locked_page; |
| 1586 | } else { |
| 1587 | if (i_size_read(inode) == 0) |
| 1588 | return; |
| 1589 | page = find_or_create_page(mapping, 0, |
| 1590 | mapping_gfp_constraint(mapping, |
| 1591 | ~__GFP_FS)); |
| 1592 | if (!page) |
| 1593 | return; |
| 1594 | if (PageUptodate(page)) { |
| 1595 | unlock_page(page); |
| 1596 | put_page(page); |
| 1597 | return; |
| 1598 | } |
| 1599 | } |
| 1600 | |
| 1601 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
| 1602 | inode, ceph_vinop(inode), len, locked_page); |
| 1603 | |
| 1604 | if (len > 0) { |
| 1605 | void *kaddr = kmap_atomic(page); |
| 1606 | memcpy(kaddr, data, len); |
| 1607 | kunmap_atomic(kaddr); |
| 1608 | } |
| 1609 | |
| 1610 | if (page != locked_page) { |
| 1611 | if (len < PAGE_SIZE) |
| 1612 | zero_user_segment(page, len, PAGE_SIZE); |
| 1613 | else |
| 1614 | flush_dcache_page(page); |
| 1615 | |
| 1616 | SetPageUptodate(page); |
| 1617 | unlock_page(page); |
| 1618 | put_page(page); |
| 1619 | } |
| 1620 | } |
| 1621 | |
| 1622 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
| 1623 | { |
| 1624 | struct inode *inode = file_inode(filp); |
| 1625 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1626 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 1627 | struct ceph_osd_request *req; |
| 1628 | struct page *page = NULL; |
| 1629 | u64 len, inline_version; |
| 1630 | int err = 0; |
| 1631 | bool from_pagecache = false; |
| 1632 | |
| 1633 | spin_lock(&ci->i_ceph_lock); |
| 1634 | inline_version = ci->i_inline_version; |
| 1635 | spin_unlock(&ci->i_ceph_lock); |
| 1636 | |
| 1637 | dout("uninline_data %p %llx.%llx inline_version %llu\n", |
| 1638 | inode, ceph_vinop(inode), inline_version); |
| 1639 | |
| 1640 | if (inline_version == 1 || /* initial version, no data */ |
| 1641 | inline_version == CEPH_INLINE_NONE) |
| 1642 | goto out; |
| 1643 | |
| 1644 | if (locked_page) { |
| 1645 | page = locked_page; |
| 1646 | WARN_ON(!PageUptodate(page)); |
| 1647 | } else if (ceph_caps_issued(ci) & |
| 1648 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { |
| 1649 | page = find_get_page(inode->i_mapping, 0); |
| 1650 | if (page) { |
| 1651 | if (PageUptodate(page)) { |
| 1652 | from_pagecache = true; |
| 1653 | lock_page(page); |
| 1654 | } else { |
| 1655 | put_page(page); |
| 1656 | page = NULL; |
| 1657 | } |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | if (page) { |
| 1662 | len = i_size_read(inode); |
| 1663 | if (len > PAGE_SIZE) |
| 1664 | len = PAGE_SIZE; |
| 1665 | } else { |
| 1666 | page = __page_cache_alloc(GFP_NOFS); |
| 1667 | if (!page) { |
| 1668 | err = -ENOMEM; |
| 1669 | goto out; |
| 1670 | } |
| 1671 | err = __ceph_do_getattr(inode, page, |
| 1672 | CEPH_STAT_CAP_INLINE_DATA, true); |
| 1673 | if (err < 0) { |
| 1674 | /* no inline data */ |
| 1675 | if (err == -ENODATA) |
| 1676 | err = 0; |
| 1677 | goto out; |
| 1678 | } |
| 1679 | len = err; |
| 1680 | } |
| 1681 | |
| 1682 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
| 1683 | ceph_vino(inode), 0, &len, 0, 1, |
| 1684 | CEPH_OSD_OP_CREATE, |
| 1685 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, |
| 1686 | NULL, 0, 0, false); |
| 1687 | if (IS_ERR(req)) { |
| 1688 | err = PTR_ERR(req); |
| 1689 | goto out; |
| 1690 | } |
| 1691 | |
| 1692 | req->r_mtime = inode->i_mtime; |
| 1693 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
| 1694 | if (!err) |
| 1695 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); |
| 1696 | ceph_osdc_put_request(req); |
| 1697 | if (err < 0) |
| 1698 | goto out; |
| 1699 | |
| 1700 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
| 1701 | ceph_vino(inode), 0, &len, 1, 3, |
| 1702 | CEPH_OSD_OP_WRITE, |
| 1703 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, |
| 1704 | NULL, ci->i_truncate_seq, |
| 1705 | ci->i_truncate_size, false); |
| 1706 | if (IS_ERR(req)) { |
| 1707 | err = PTR_ERR(req); |
| 1708 | goto out; |
| 1709 | } |
| 1710 | |
| 1711 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); |
| 1712 | |
| 1713 | { |
| 1714 | __le64 xattr_buf = cpu_to_le64(inline_version); |
| 1715 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, |
| 1716 | "inline_version", &xattr_buf, |
| 1717 | sizeof(xattr_buf), |
| 1718 | CEPH_OSD_CMPXATTR_OP_GT, |
| 1719 | CEPH_OSD_CMPXATTR_MODE_U64); |
| 1720 | if (err) |
| 1721 | goto out_put; |
| 1722 | } |
| 1723 | |
| 1724 | { |
| 1725 | char xattr_buf[32]; |
| 1726 | int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), |
| 1727 | "%llu", inline_version); |
| 1728 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, |
| 1729 | "inline_version", |
| 1730 | xattr_buf, xattr_len, 0, 0); |
| 1731 | if (err) |
| 1732 | goto out_put; |
| 1733 | } |
| 1734 | |
| 1735 | req->r_mtime = inode->i_mtime; |
| 1736 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
| 1737 | if (!err) |
| 1738 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); |
| 1739 | out_put: |
| 1740 | ceph_osdc_put_request(req); |
| 1741 | if (err == -ECANCELED) |
| 1742 | err = 0; |
| 1743 | out: |
| 1744 | if (page && page != locked_page) { |
| 1745 | if (from_pagecache) { |
| 1746 | unlock_page(page); |
| 1747 | put_page(page); |
| 1748 | } else |
| 1749 | __free_pages(page, 0); |
| 1750 | } |
| 1751 | |
| 1752 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", |
| 1753 | inode, ceph_vinop(inode), inline_version, err); |
| 1754 | return err; |
| 1755 | } |
| 1756 | |
| 1757 | static const struct vm_operations_struct ceph_vmops = { |
| 1758 | .fault = ceph_filemap_fault, |
| 1759 | .page_mkwrite = ceph_page_mkwrite, |
| 1760 | }; |
| 1761 | |
| 1762 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) |
| 1763 | { |
| 1764 | struct address_space *mapping = file->f_mapping; |
| 1765 | |
| 1766 | if (!mapping->a_ops->readpage) |
| 1767 | return -ENOEXEC; |
| 1768 | file_accessed(file); |
| 1769 | vma->vm_ops = &ceph_vmops; |
| 1770 | return 0; |
| 1771 | } |
| 1772 | |
| 1773 | enum { |
| 1774 | POOL_READ = 1, |
| 1775 | POOL_WRITE = 2, |
| 1776 | }; |
| 1777 | |
| 1778 | static int __ceph_pool_perm_get(struct ceph_inode_info *ci, |
| 1779 | s64 pool, struct ceph_string *pool_ns) |
| 1780 | { |
| 1781 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); |
| 1782 | struct ceph_mds_client *mdsc = fsc->mdsc; |
| 1783 | struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; |
| 1784 | struct rb_node **p, *parent; |
| 1785 | struct ceph_pool_perm *perm; |
| 1786 | struct page **pages; |
| 1787 | size_t pool_ns_len; |
| 1788 | int err = 0, err2 = 0, have = 0; |
| 1789 | |
| 1790 | down_read(&mdsc->pool_perm_rwsem); |
| 1791 | p = &mdsc->pool_perm_tree.rb_node; |
| 1792 | while (*p) { |
| 1793 | perm = rb_entry(*p, struct ceph_pool_perm, node); |
| 1794 | if (pool < perm->pool) |
| 1795 | p = &(*p)->rb_left; |
| 1796 | else if (pool > perm->pool) |
| 1797 | p = &(*p)->rb_right; |
| 1798 | else { |
| 1799 | int ret = ceph_compare_string(pool_ns, |
| 1800 | perm->pool_ns, |
| 1801 | perm->pool_ns_len); |
| 1802 | if (ret < 0) |
| 1803 | p = &(*p)->rb_left; |
| 1804 | else if (ret > 0) |
| 1805 | p = &(*p)->rb_right; |
| 1806 | else { |
| 1807 | have = perm->perm; |
| 1808 | break; |
| 1809 | } |
| 1810 | } |
| 1811 | } |
| 1812 | up_read(&mdsc->pool_perm_rwsem); |
| 1813 | if (*p) |
| 1814 | goto out; |
| 1815 | |
| 1816 | if (pool_ns) |
| 1817 | dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", |
| 1818 | pool, (int)pool_ns->len, pool_ns->str); |
| 1819 | else |
| 1820 | dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); |
| 1821 | |
| 1822 | down_write(&mdsc->pool_perm_rwsem); |
| 1823 | p = &mdsc->pool_perm_tree.rb_node; |
| 1824 | parent = NULL; |
| 1825 | while (*p) { |
| 1826 | parent = *p; |
| 1827 | perm = rb_entry(parent, struct ceph_pool_perm, node); |
| 1828 | if (pool < perm->pool) |
| 1829 | p = &(*p)->rb_left; |
| 1830 | else if (pool > perm->pool) |
| 1831 | p = &(*p)->rb_right; |
| 1832 | else { |
| 1833 | int ret = ceph_compare_string(pool_ns, |
| 1834 | perm->pool_ns, |
| 1835 | perm->pool_ns_len); |
| 1836 | if (ret < 0) |
| 1837 | p = &(*p)->rb_left; |
| 1838 | else if (ret > 0) |
| 1839 | p = &(*p)->rb_right; |
| 1840 | else { |
| 1841 | have = perm->perm; |
| 1842 | break; |
| 1843 | } |
| 1844 | } |
| 1845 | } |
| 1846 | if (*p) { |
| 1847 | up_write(&mdsc->pool_perm_rwsem); |
| 1848 | goto out; |
| 1849 | } |
| 1850 | |
| 1851 | rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
| 1852 | 1, false, GFP_NOFS); |
| 1853 | if (!rd_req) { |
| 1854 | err = -ENOMEM; |
| 1855 | goto out_unlock; |
| 1856 | } |
| 1857 | |
| 1858 | rd_req->r_flags = CEPH_OSD_FLAG_READ; |
| 1859 | osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); |
| 1860 | rd_req->r_base_oloc.pool = pool; |
| 1861 | if (pool_ns) |
| 1862 | rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); |
| 1863 | ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); |
| 1864 | |
| 1865 | err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); |
| 1866 | if (err) |
| 1867 | goto out_unlock; |
| 1868 | |
| 1869 | wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, |
| 1870 | 1, false, GFP_NOFS); |
| 1871 | if (!wr_req) { |
| 1872 | err = -ENOMEM; |
| 1873 | goto out_unlock; |
| 1874 | } |
| 1875 | |
| 1876 | wr_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ACK; |
| 1877 | osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); |
| 1878 | ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); |
| 1879 | ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); |
| 1880 | |
| 1881 | err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); |
| 1882 | if (err) |
| 1883 | goto out_unlock; |
| 1884 | |
| 1885 | /* one page should be large enough for STAT data */ |
| 1886 | pages = ceph_alloc_page_vector(1, GFP_KERNEL); |
| 1887 | if (IS_ERR(pages)) { |
| 1888 | err = PTR_ERR(pages); |
| 1889 | goto out_unlock; |
| 1890 | } |
| 1891 | |
| 1892 | osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, |
| 1893 | 0, false, true); |
| 1894 | err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); |
| 1895 | |
| 1896 | wr_req->r_mtime = ci->vfs_inode.i_mtime; |
| 1897 | err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); |
| 1898 | |
| 1899 | if (!err) |
| 1900 | err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); |
| 1901 | if (!err2) |
| 1902 | err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); |
| 1903 | |
| 1904 | if (err >= 0 || err == -ENOENT) |
| 1905 | have |= POOL_READ; |
| 1906 | else if (err != -EPERM) |
| 1907 | goto out_unlock; |
| 1908 | |
| 1909 | if (err2 == 0 || err2 == -EEXIST) |
| 1910 | have |= POOL_WRITE; |
| 1911 | else if (err2 != -EPERM) { |
| 1912 | err = err2; |
| 1913 | goto out_unlock; |
| 1914 | } |
| 1915 | |
| 1916 | pool_ns_len = pool_ns ? pool_ns->len : 0; |
| 1917 | perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); |
| 1918 | if (!perm) { |
| 1919 | err = -ENOMEM; |
| 1920 | goto out_unlock; |
| 1921 | } |
| 1922 | |
| 1923 | perm->pool = pool; |
| 1924 | perm->perm = have; |
| 1925 | perm->pool_ns_len = pool_ns_len; |
| 1926 | if (pool_ns_len > 0) |
| 1927 | memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); |
| 1928 | perm->pool_ns[pool_ns_len] = 0; |
| 1929 | |
| 1930 | rb_link_node(&perm->node, parent, p); |
| 1931 | rb_insert_color(&perm->node, &mdsc->pool_perm_tree); |
| 1932 | err = 0; |
| 1933 | out_unlock: |
| 1934 | up_write(&mdsc->pool_perm_rwsem); |
| 1935 | |
| 1936 | ceph_osdc_put_request(rd_req); |
| 1937 | ceph_osdc_put_request(wr_req); |
| 1938 | out: |
| 1939 | if (!err) |
| 1940 | err = have; |
| 1941 | if (pool_ns) |
| 1942 | dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", |
| 1943 | pool, (int)pool_ns->len, pool_ns->str, err); |
| 1944 | else |
| 1945 | dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); |
| 1946 | return err; |
| 1947 | } |
| 1948 | |
| 1949 | int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) |
| 1950 | { |
| 1951 | s64 pool; |
| 1952 | struct ceph_string *pool_ns; |
| 1953 | int ret, flags; |
| 1954 | |
| 1955 | if (ci->i_vino.snap != CEPH_NOSNAP) { |
| 1956 | /* |
| 1957 | * Pool permission check needs to write to the first object. |
| 1958 | * But for snapshot, head of the first object may have alread |
| 1959 | * been deleted. Skip check to avoid creating orphan object. |
| 1960 | */ |
| 1961 | return 0; |
| 1962 | } |
| 1963 | |
| 1964 | if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), |
| 1965 | NOPOOLPERM)) |
| 1966 | return 0; |
| 1967 | |
| 1968 | spin_lock(&ci->i_ceph_lock); |
| 1969 | flags = ci->i_ceph_flags; |
| 1970 | pool = ci->i_layout.pool_id; |
| 1971 | spin_unlock(&ci->i_ceph_lock); |
| 1972 | check: |
| 1973 | if (flags & CEPH_I_POOL_PERM) { |
| 1974 | if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { |
| 1975 | dout("ceph_pool_perm_check pool %lld no read perm\n", |
| 1976 | pool); |
| 1977 | return -EPERM; |
| 1978 | } |
| 1979 | if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { |
| 1980 | dout("ceph_pool_perm_check pool %lld no write perm\n", |
| 1981 | pool); |
| 1982 | return -EPERM; |
| 1983 | } |
| 1984 | return 0; |
| 1985 | } |
| 1986 | |
| 1987 | pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); |
| 1988 | ret = __ceph_pool_perm_get(ci, pool, pool_ns); |
| 1989 | ceph_put_string(pool_ns); |
| 1990 | if (ret < 0) |
| 1991 | return ret; |
| 1992 | |
| 1993 | flags = CEPH_I_POOL_PERM; |
| 1994 | if (ret & POOL_READ) |
| 1995 | flags |= CEPH_I_POOL_RD; |
| 1996 | if (ret & POOL_WRITE) |
| 1997 | flags |= CEPH_I_POOL_WR; |
| 1998 | |
| 1999 | spin_lock(&ci->i_ceph_lock); |
| 2000 | if (pool == ci->i_layout.pool_id && |
| 2001 | pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { |
| 2002 | ci->i_ceph_flags |= flags; |
| 2003 | } else { |
| 2004 | pool = ci->i_layout.pool_id; |
| 2005 | flags = ci->i_ceph_flags; |
| 2006 | } |
| 2007 | spin_unlock(&ci->i_ceph_lock); |
| 2008 | goto check; |
| 2009 | } |
| 2010 | |
| 2011 | void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) |
| 2012 | { |
| 2013 | struct ceph_pool_perm *perm; |
| 2014 | struct rb_node *n; |
| 2015 | |
| 2016 | while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { |
| 2017 | n = rb_first(&mdsc->pool_perm_tree); |
| 2018 | perm = rb_entry(n, struct ceph_pool_perm, node); |
| 2019 | rb_erase(n, &mdsc->pool_perm_tree); |
| 2020 | kfree(perm); |
| 2021 | } |
| 2022 | } |