Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / exofs / inode.c
blob77d0a295eb1cd3e95443da014fc9801cf64f5aff
1 /*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
4 * Copyright (C) 2005, 2006
5 * International Business Machines
6 * Copyright (C) 2008, 2009
7 * Boaz Harrosh <bharrosh@panasas.com>
9 * Copyrights for code taken from ext2:
10 * Copyright (C) 1992, 1993, 1994, 1995
11 * Remy Card (card@masi.ibp.fr)
12 * Laboratoire MASI - Institut Blaise Pascal
13 * Universite Pierre et Marie Curie (Paris VI)
14 * from
15 * linux/fs/minix/inode.c
16 * Copyright (C) 1991, 1992 Linus Torvalds
18 * This file is part of exofs.
20 * exofs is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation. Since it is based on ext2, and the only
23 * valid version of GPL for the Linux kernel is version 2, the only valid
24 * version of GPL for exofs is version 2.
26 * exofs is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with exofs; if not, write to the Free Software
33 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
36 #include <linux/writeback.h>
37 #include <linux/buffer_head.h>
38 #include <scsi/scsi_device.h>
40 #include "exofs.h"
42 #ifdef CONFIG_EXOFS_DEBUG
43 # define EXOFS_DEBUG_OBJ_ISIZE 1
44 #endif
46 struct page_collect {
47 struct exofs_sb_info *sbi;
48 struct request_queue *req_q;
49 struct inode *inode;
50 unsigned expected_pages;
52 struct bio *bio;
53 unsigned nr_pages;
54 unsigned long length;
55 loff_t pg_first; /* keep 64bit also in 32-arches */
58 static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
59 struct inode *inode)
61 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
63 pcol->sbi = sbi;
64 pcol->req_q = osd_request_queue(sbi->s_dev);
65 pcol->inode = inode;
66 pcol->expected_pages = expected_pages;
68 pcol->bio = NULL;
69 pcol->nr_pages = 0;
70 pcol->length = 0;
71 pcol->pg_first = -1;
73 EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino,
74 expected_pages);
77 static void _pcol_reset(struct page_collect *pcol)
79 pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
81 pcol->bio = NULL;
82 pcol->nr_pages = 0;
83 pcol->length = 0;
84 pcol->pg_first = -1;
85 EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n",
86 pcol->inode->i_ino, pcol->expected_pages);
88 /* this is probably the end of the loop but in writes
89 * it might not end here. don't be left with nothing
91 if (!pcol->expected_pages)
92 pcol->expected_pages = 128;
95 static int pcol_try_alloc(struct page_collect *pcol)
97 int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES);
99 for (; pages; pages >>= 1) {
100 pcol->bio = bio_alloc(GFP_KERNEL, pages);
101 if (likely(pcol->bio))
102 return 0;
105 EXOFS_ERR("Failed to kcalloc expected_pages=%u\n",
106 pcol->expected_pages);
107 return -ENOMEM;
110 static void pcol_free(struct page_collect *pcol)
112 bio_put(pcol->bio);
113 pcol->bio = NULL;
116 static int pcol_add_page(struct page_collect *pcol, struct page *page,
117 unsigned len)
119 int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0);
120 if (unlikely(len != added_len))
121 return -ENOMEM;
123 ++pcol->nr_pages;
124 pcol->length += len;
125 return 0;
128 static int update_read_page(struct page *page, int ret)
130 if (ret == 0) {
131 /* Everything is OK */
132 SetPageUptodate(page);
133 if (PageError(page))
134 ClearPageError(page);
135 } else if (ret == -EFAULT) {
136 /* In this case we were trying to read something that wasn't on
137 * disk yet - return a page full of zeroes. This should be OK,
138 * because the object should be empty (if there was a write
139 * before this read, the read would be waiting with the page
140 * locked */
141 clear_highpage(page);
143 SetPageUptodate(page);
144 if (PageError(page))
145 ClearPageError(page);
146 ret = 0; /* recovered error */
147 EXOFS_DBGMSG("recovered read error\n");
148 } else /* Error */
149 SetPageError(page);
151 return ret;
154 static void update_write_page(struct page *page, int ret)
156 if (ret) {
157 mapping_set_error(page->mapping, ret);
158 SetPageError(page);
160 end_page_writeback(page);
163 /* Called at the end of reads, to optionally unlock pages and update their
164 * status.
166 static int __readpages_done(struct osd_request *or, struct page_collect *pcol,
167 bool do_unlock)
169 struct bio_vec *bvec;
170 int i;
171 u64 resid;
172 u64 good_bytes;
173 u64 length = 0;
174 int ret = exofs_check_ok_resid(or, &resid, NULL);
176 osd_end_request(or);
178 if (likely(!ret))
179 good_bytes = pcol->length;
180 else if (!resid)
181 good_bytes = 0;
182 else
183 good_bytes = pcol->length - resid;
185 EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx"
186 " length=0x%lx nr_pages=%u\n",
187 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
188 pcol->nr_pages);
190 __bio_for_each_segment(bvec, pcol->bio, i, 0) {
191 struct page *page = bvec->bv_page;
192 struct inode *inode = page->mapping->host;
193 int page_stat;
195 if (inode != pcol->inode)
196 continue; /* osd might add more pages at end */
198 if (likely(length < good_bytes))
199 page_stat = 0;
200 else
201 page_stat = ret;
203 EXOFS_DBGMSG(" readpages_done(0x%lx, 0x%lx) %s\n",
204 inode->i_ino, page->index,
205 page_stat ? "bad_bytes" : "good_bytes");
207 ret = update_read_page(page, page_stat);
208 if (do_unlock)
209 unlock_page(page);
210 length += bvec->bv_len;
213 pcol_free(pcol);
214 EXOFS_DBGMSG("readpages_done END\n");
215 return ret;
218 /* callback of async reads */
219 static void readpages_done(struct osd_request *or, void *p)
221 struct page_collect *pcol = p;
223 __readpages_done(or, pcol, true);
224 atomic_dec(&pcol->sbi->s_curr_pending);
225 kfree(p);
228 static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
230 struct bio_vec *bvec;
231 int i;
233 __bio_for_each_segment(bvec, pcol->bio, i, 0) {
234 struct page *page = bvec->bv_page;
236 if (rw == READ)
237 update_read_page(page, ret);
238 else
239 update_write_page(page, ret);
241 unlock_page(page);
243 pcol_free(pcol);
246 static int read_exec(struct page_collect *pcol, bool is_sync)
248 struct exofs_i_info *oi = exofs_i(pcol->inode);
249 struct osd_obj_id obj = {pcol->sbi->s_pid,
250 pcol->inode->i_ino + EXOFS_OBJ_OFF};
251 struct osd_request *or = NULL;
252 struct page_collect *pcol_copy = NULL;
253 loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
254 int ret;
256 if (!pcol->bio)
257 return 0;
259 /* see comment in _readpage() about sync reads */
260 WARN_ON(is_sync && (pcol->nr_pages != 1));
262 or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
263 if (unlikely(!or)) {
264 ret = -ENOMEM;
265 goto err;
268 osd_req_read(or, &obj, i_start, pcol->bio, pcol->length);
270 if (is_sync) {
271 exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred);
272 return __readpages_done(or, pcol, false);
275 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
276 if (!pcol_copy) {
277 ret = -ENOMEM;
278 goto err;
281 *pcol_copy = *pcol;
282 ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred);
283 if (unlikely(ret))
284 goto err;
286 atomic_inc(&pcol->sbi->s_curr_pending);
288 EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
289 obj.id, _LLU(i_start), pcol->length);
291 /* pages ownership was passed to pcol_copy */
292 _pcol_reset(pcol);
293 return 0;
295 err:
296 if (!is_sync)
297 _unlock_pcol_pages(pcol, ret, READ);
298 kfree(pcol_copy);
299 if (or)
300 osd_end_request(or);
301 return ret;
304 /* readpage_strip is called either directly from readpage() or by the VFS from
305 * within read_cache_pages(), to add one more page to be read. It will try to
306 * collect as many contiguous pages as posible. If a discontinuity is
307 * encountered, or it runs out of resources, it will submit the previous segment
308 * and will start a new collection. Eventually caller must submit the last
309 * segment if present.
311 static int readpage_strip(void *data, struct page *page)
313 struct page_collect *pcol = data;
314 struct inode *inode = pcol->inode;
315 struct exofs_i_info *oi = exofs_i(inode);
316 loff_t i_size = i_size_read(inode);
317 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
318 size_t len;
319 int ret;
321 /* FIXME: Just for debugging, will be removed */
322 if (PageUptodate(page))
323 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
324 page->index);
326 if (page->index < end_index)
327 len = PAGE_CACHE_SIZE;
328 else if (page->index == end_index)
329 len = i_size & ~PAGE_CACHE_MASK;
330 else
331 len = 0;
333 if (!len || !obj_created(oi)) {
334 /* this will be out of bounds, or doesn't exist yet.
335 * Current page is cleared and the request is split
337 clear_highpage(page);
339 SetPageUptodate(page);
340 if (PageError(page))
341 ClearPageError(page);
343 unlock_page(page);
344 EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page,"
345 " splitting\n", inode->i_ino, page->index);
347 return read_exec(pcol, false);
350 try_again:
352 if (unlikely(pcol->pg_first == -1)) {
353 pcol->pg_first = page->index;
354 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
355 page->index)) {
356 /* Discontinuity detected, split the request */
357 ret = read_exec(pcol, false);
358 if (unlikely(ret))
359 goto fail;
360 goto try_again;
363 if (!pcol->bio) {
364 ret = pcol_try_alloc(pcol);
365 if (unlikely(ret))
366 goto fail;
369 if (len != PAGE_CACHE_SIZE)
370 zero_user(page, len, PAGE_CACHE_SIZE - len);
372 EXOFS_DBGMSG(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
373 inode->i_ino, page->index, len);
375 ret = pcol_add_page(pcol, page, len);
376 if (ret) {
377 EXOFS_DBGMSG("Failed pcol_add_page pages[i]=%p "
378 "this_len=0x%zx nr_pages=%u length=0x%lx\n",
379 page, len, pcol->nr_pages, pcol->length);
381 /* split the request, and start again with current page */
382 ret = read_exec(pcol, false);
383 if (unlikely(ret))
384 goto fail;
386 goto try_again;
389 return 0;
391 fail:
392 /* SetPageError(page); ??? */
393 unlock_page(page);
394 return ret;
397 static int exofs_readpages(struct file *file, struct address_space *mapping,
398 struct list_head *pages, unsigned nr_pages)
400 struct page_collect pcol;
401 int ret;
403 _pcol_init(&pcol, nr_pages, mapping->host);
405 ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
406 if (ret) {
407 EXOFS_ERR("read_cache_pages => %d\n", ret);
408 return ret;
411 return read_exec(&pcol, false);
414 static int _readpage(struct page *page, bool is_sync)
416 struct page_collect pcol;
417 int ret;
419 _pcol_init(&pcol, 1, page->mapping->host);
421 /* readpage_strip might call read_exec(,async) inside at several places
422 * but this is safe for is_async=0 since read_exec will not do anything
423 * when we have a single page.
425 ret = readpage_strip(&pcol, page);
426 if (ret) {
427 EXOFS_ERR("_readpage => %d\n", ret);
428 return ret;
431 return read_exec(&pcol, is_sync);
435 * We don't need the file
437 static int exofs_readpage(struct file *file, struct page *page)
439 return _readpage(page, false);
442 /* Callback for osd_write. All writes are asynchronouse */
443 static void writepages_done(struct osd_request *or, void *p)
445 struct page_collect *pcol = p;
446 struct bio_vec *bvec;
447 int i;
448 u64 resid;
449 u64 good_bytes;
450 u64 length = 0;
452 int ret = exofs_check_ok_resid(or, NULL, &resid);
454 osd_end_request(or);
455 atomic_dec(&pcol->sbi->s_curr_pending);
457 if (likely(!ret))
458 good_bytes = pcol->length;
459 else if (!resid)
460 good_bytes = 0;
461 else
462 good_bytes = pcol->length - resid;
464 EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx"
465 " length=0x%lx nr_pages=%u\n",
466 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
467 pcol->nr_pages);
469 __bio_for_each_segment(bvec, pcol->bio, i, 0) {
470 struct page *page = bvec->bv_page;
471 struct inode *inode = page->mapping->host;
472 int page_stat;
474 if (inode != pcol->inode)
475 continue; /* osd might add more pages to a bio */
477 if (likely(length < good_bytes))
478 page_stat = 0;
479 else
480 page_stat = ret;
482 update_write_page(page, page_stat);
483 unlock_page(page);
484 EXOFS_DBGMSG(" writepages_done(0x%lx, 0x%lx) status=%d\n",
485 inode->i_ino, page->index, page_stat);
487 length += bvec->bv_len;
490 pcol_free(pcol);
491 kfree(pcol);
492 EXOFS_DBGMSG("writepages_done END\n");
495 static int write_exec(struct page_collect *pcol)
497 struct exofs_i_info *oi = exofs_i(pcol->inode);
498 struct osd_obj_id obj = {pcol->sbi->s_pid,
499 pcol->inode->i_ino + EXOFS_OBJ_OFF};
500 struct osd_request *or = NULL;
501 struct page_collect *pcol_copy = NULL;
502 loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
503 int ret;
505 if (!pcol->bio)
506 return 0;
508 or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
509 if (unlikely(!or)) {
510 EXOFS_ERR("write_exec: Faild to osd_start_request()\n");
511 ret = -ENOMEM;
512 goto err;
515 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
516 if (!pcol_copy) {
517 EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n");
518 ret = -ENOMEM;
519 goto err;
522 *pcol_copy = *pcol;
524 pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
525 osd_req_write(or, &obj, i_start, pcol_copy->bio, pcol_copy->length);
526 ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred);
527 if (unlikely(ret)) {
528 EXOFS_ERR("write_exec: exofs_async_op() Faild\n");
529 goto err;
532 atomic_inc(&pcol->sbi->s_curr_pending);
533 EXOFS_DBGMSG("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n",
534 pcol->inode->i_ino, pcol->pg_first, _LLU(i_start),
535 pcol->length);
536 /* pages ownership was passed to pcol_copy */
537 _pcol_reset(pcol);
538 return 0;
540 err:
541 _unlock_pcol_pages(pcol, ret, WRITE);
542 kfree(pcol_copy);
543 if (or)
544 osd_end_request(or);
545 return ret;
548 /* writepage_strip is called either directly from writepage() or by the VFS from
549 * within write_cache_pages(), to add one more page to be written to storage.
550 * It will try to collect as many contiguous pages as possible. If a
551 * discontinuity is encountered or it runs out of resources it will submit the
552 * previous segment and will start a new collection.
553 * Eventually caller must submit the last segment if present.
555 static int writepage_strip(struct page *page,
556 struct writeback_control *wbc_unused, void *data)
558 struct page_collect *pcol = data;
559 struct inode *inode = pcol->inode;
560 struct exofs_i_info *oi = exofs_i(inode);
561 loff_t i_size = i_size_read(inode);
562 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
563 size_t len;
564 int ret;
566 BUG_ON(!PageLocked(page));
568 ret = wait_obj_created(oi);
569 if (unlikely(ret))
570 goto fail;
572 if (page->index < end_index)
573 /* in this case, the page is within the limits of the file */
574 len = PAGE_CACHE_SIZE;
575 else {
576 len = i_size & ~PAGE_CACHE_MASK;
578 if (page->index > end_index || !len) {
579 /* in this case, the page is outside the limits
580 * (truncate in progress)
582 ret = write_exec(pcol);
583 if (unlikely(ret))
584 goto fail;
585 if (PageError(page))
586 ClearPageError(page);
587 unlock_page(page);
588 return 0;
592 try_again:
594 if (unlikely(pcol->pg_first == -1)) {
595 pcol->pg_first = page->index;
596 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
597 page->index)) {
598 /* Discontinuity detected, split the request */
599 ret = write_exec(pcol);
600 if (unlikely(ret))
601 goto fail;
602 goto try_again;
605 if (!pcol->bio) {
606 ret = pcol_try_alloc(pcol);
607 if (unlikely(ret))
608 goto fail;
611 EXOFS_DBGMSG(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
612 inode->i_ino, page->index, len);
614 ret = pcol_add_page(pcol, page, len);
615 if (unlikely(ret)) {
616 EXOFS_DBGMSG("Failed pcol_add_page "
617 "nr_pages=%u total_length=0x%lx\n",
618 pcol->nr_pages, pcol->length);
620 /* split the request, next loop will start again */
621 ret = write_exec(pcol);
622 if (unlikely(ret)) {
623 EXOFS_DBGMSG("write_exec faild => %d", ret);
624 goto fail;
627 goto try_again;
630 BUG_ON(PageWriteback(page));
631 set_page_writeback(page);
633 return 0;
635 fail:
636 set_bit(AS_EIO, &page->mapping->flags);
637 unlock_page(page);
638 return ret;
641 static int exofs_writepages(struct address_space *mapping,
642 struct writeback_control *wbc)
644 struct page_collect pcol;
645 long start, end, expected_pages;
646 int ret;
648 start = wbc->range_start >> PAGE_CACHE_SHIFT;
649 end = (wbc->range_end == LLONG_MAX) ?
650 start + mapping->nrpages :
651 wbc->range_end >> PAGE_CACHE_SHIFT;
653 if (start || end)
654 expected_pages = min(end - start + 1, 32L);
655 else
656 expected_pages = mapping->nrpages;
658 EXOFS_DBGMSG("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx"
659 " m->nrpages=%lu start=0x%lx end=0x%lx\n",
660 mapping->host->i_ino, wbc->range_start, wbc->range_end,
661 mapping->nrpages, start, end);
663 _pcol_init(&pcol, expected_pages, mapping->host);
665 ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
666 if (ret) {
667 EXOFS_ERR("write_cache_pages => %d\n", ret);
668 return ret;
671 return write_exec(&pcol);
674 static int exofs_writepage(struct page *page, struct writeback_control *wbc)
676 struct page_collect pcol;
677 int ret;
679 _pcol_init(&pcol, 1, page->mapping->host);
681 ret = writepage_strip(page, NULL, &pcol);
682 if (ret) {
683 EXOFS_ERR("exofs_writepage => %d\n", ret);
684 return ret;
687 return write_exec(&pcol);
690 int exofs_write_begin(struct file *file, struct address_space *mapping,
691 loff_t pos, unsigned len, unsigned flags,
692 struct page **pagep, void **fsdata)
694 int ret = 0;
695 struct page *page;
697 page = *pagep;
698 if (page == NULL) {
699 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
700 fsdata);
701 if (ret) {
702 EXOFS_DBGMSG("simple_write_begin faild\n");
703 return ret;
706 page = *pagep;
709 /* read modify write */
710 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
711 ret = _readpage(page, true);
712 if (ret) {
713 /*SetPageError was done by _readpage. Is it ok?*/
714 unlock_page(page);
715 EXOFS_DBGMSG("__readpage_filler faild\n");
719 return ret;
722 static int exofs_write_begin_export(struct file *file,
723 struct address_space *mapping,
724 loff_t pos, unsigned len, unsigned flags,
725 struct page **pagep, void **fsdata)
727 *pagep = NULL;
729 return exofs_write_begin(file, mapping, pos, len, flags, pagep,
730 fsdata);
733 const struct address_space_operations exofs_aops = {
734 .readpage = exofs_readpage,
735 .readpages = exofs_readpages,
736 .writepage = exofs_writepage,
737 .writepages = exofs_writepages,
738 .write_begin = exofs_write_begin_export,
739 .write_end = simple_write_end,
742 /******************************************************************************
743 * INODE OPERATIONS
744 *****************************************************************************/
747 * Test whether an inode is a fast symlink.
749 static inline int exofs_inode_is_fast_symlink(struct inode *inode)
751 struct exofs_i_info *oi = exofs_i(inode);
753 return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
757 * get_block_t - Fill in a buffer_head
758 * An OSD takes care of block allocation so we just fake an allocation by
759 * putting in the inode's sector_t in the buffer_head.
760 * TODO: What about the case of create==0 and @iblock does not exist in the
761 * object?
763 static int exofs_get_block(struct inode *inode, sector_t iblock,
764 struct buffer_head *bh_result, int create)
766 map_bh(bh_result, inode->i_sb, iblock);
767 return 0;
770 const struct osd_attr g_attr_logical_length = ATTR_DEF(
771 OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
774 * Truncate a file to the specified size - all we have to do is set the size
775 * attribute. We make sure the object exists first.
777 void exofs_truncate(struct inode *inode)
779 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
780 struct exofs_i_info *oi = exofs_i(inode);
781 struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
782 struct osd_request *or;
783 struct osd_attr attr;
784 loff_t isize = i_size_read(inode);
785 __be64 newsize;
786 int ret;
788 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
789 || S_ISLNK(inode->i_mode)))
790 return;
791 if (exofs_inode_is_fast_symlink(inode))
792 return;
793 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
794 return;
795 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
797 nobh_truncate_page(inode->i_mapping, isize, exofs_get_block);
799 or = osd_start_request(sbi->s_dev, GFP_KERNEL);
800 if (unlikely(!or)) {
801 EXOFS_ERR("ERROR: exofs_truncate: osd_start_request failed\n");
802 goto fail;
805 osd_req_set_attributes(or, &obj);
807 newsize = cpu_to_be64((u64)isize);
808 attr = g_attr_logical_length;
809 attr.val_ptr = &newsize;
810 osd_req_add_set_attr_list(or, &attr, 1);
812 /* if we are about to truncate an object, and it hasn't been
813 * created yet, wait
815 if (unlikely(wait_obj_created(oi)))
816 goto fail;
818 ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
819 osd_end_request(or);
820 if (ret)
821 goto fail;
823 out:
824 mark_inode_dirty(inode);
825 return;
826 fail:
827 make_bad_inode(inode);
828 goto out;
832 * Set inode attributes - just call generic functions.
834 int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
836 struct inode *inode = dentry->d_inode;
837 int error;
839 error = inode_change_ok(inode, iattr);
840 if (error)
841 return error;
843 error = inode_setattr(inode, iattr);
844 return error;
848 * Read an inode from the OSD, and return it as is. We also return the size
849 * attribute in the 'sanity' argument if we got compiled with debugging turned
850 * on.
852 static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
853 struct exofs_fcb *inode, uint64_t *sanity)
855 struct exofs_sb_info *sbi = sb->s_fs_info;
856 struct osd_request *or;
857 struct osd_attr attr;
858 struct osd_obj_id obj = {sbi->s_pid,
859 oi->vfs_inode.i_ino + EXOFS_OBJ_OFF};
860 int ret;
862 exofs_make_credential(oi->i_cred, &obj);
864 or = osd_start_request(sbi->s_dev, GFP_KERNEL);
865 if (unlikely(!or)) {
866 EXOFS_ERR("exofs_get_inode: osd_start_request failed.\n");
867 return -ENOMEM;
869 osd_req_get_attributes(or, &obj);
871 /* we need the inode attribute */
872 osd_req_add_get_attr_list(or, &g_attr_inode_data, 1);
874 #ifdef EXOFS_DEBUG_OBJ_ISIZE
875 /* we get the size attributes to do a sanity check */
876 osd_req_add_get_attr_list(or, &g_attr_logical_length, 1);
877 #endif
879 ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
880 if (ret)
881 goto out;
883 attr = g_attr_inode_data;
884 ret = extract_attr_from_req(or, &attr);
885 if (ret) {
886 EXOFS_ERR("exofs_get_inode: extract_attr_from_req failed\n");
887 goto out;
890 WARN_ON(attr.len != EXOFS_INO_ATTR_SIZE);
891 memcpy(inode, attr.val_ptr, EXOFS_INO_ATTR_SIZE);
893 #ifdef EXOFS_DEBUG_OBJ_ISIZE
894 attr = g_attr_logical_length;
895 ret = extract_attr_from_req(or, &attr);
896 if (ret) {
897 EXOFS_ERR("ERROR: extract attr from or failed\n");
898 goto out;
900 *sanity = get_unaligned_be64(attr.val_ptr);
901 #endif
903 out:
904 osd_end_request(or);
905 return ret;
909 * Fill in an inode read from the OSD and set it up for use
911 struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
913 struct exofs_i_info *oi;
914 struct exofs_fcb fcb;
915 struct inode *inode;
916 uint64_t uninitialized_var(sanity);
917 int ret;
919 inode = iget_locked(sb, ino);
920 if (!inode)
921 return ERR_PTR(-ENOMEM);
922 if (!(inode->i_state & I_NEW))
923 return inode;
924 oi = exofs_i(inode);
926 /* read the inode from the osd */
927 ret = exofs_get_inode(sb, oi, &fcb, &sanity);
928 if (ret)
929 goto bad_inode;
931 init_waitqueue_head(&oi->i_wq);
932 set_obj_created(oi);
934 /* copy stuff from on-disk struct to in-memory struct */
935 inode->i_mode = le16_to_cpu(fcb.i_mode);
936 inode->i_uid = le32_to_cpu(fcb.i_uid);
937 inode->i_gid = le32_to_cpu(fcb.i_gid);
938 inode->i_nlink = le16_to_cpu(fcb.i_links_count);
939 inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
940 inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
941 inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
942 inode->i_ctime.tv_nsec =
943 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
944 oi->i_commit_size = le64_to_cpu(fcb.i_size);
945 i_size_write(inode, oi->i_commit_size);
946 inode->i_blkbits = EXOFS_BLKSHIFT;
947 inode->i_generation = le32_to_cpu(fcb.i_generation);
949 #ifdef EXOFS_DEBUG_OBJ_ISIZE
950 if ((inode->i_size != sanity) &&
951 (!exofs_inode_is_fast_symlink(inode))) {
952 EXOFS_ERR("WARNING: Size of object from inode and "
953 "attributes differ (%lld != %llu)\n",
954 inode->i_size, _LLU(sanity));
956 #endif
958 oi->i_dir_start_lookup = 0;
960 if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
961 ret = -ESTALE;
962 goto bad_inode;
965 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
966 if (fcb.i_data[0])
967 inode->i_rdev =
968 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
969 else
970 inode->i_rdev =
971 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
972 } else {
973 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
976 if (S_ISREG(inode->i_mode)) {
977 inode->i_op = &exofs_file_inode_operations;
978 inode->i_fop = &exofs_file_operations;
979 inode->i_mapping->a_ops = &exofs_aops;
980 } else if (S_ISDIR(inode->i_mode)) {
981 inode->i_op = &exofs_dir_inode_operations;
982 inode->i_fop = &exofs_dir_operations;
983 inode->i_mapping->a_ops = &exofs_aops;
984 } else if (S_ISLNK(inode->i_mode)) {
985 if (exofs_inode_is_fast_symlink(inode))
986 inode->i_op = &exofs_fast_symlink_inode_operations;
987 else {
988 inode->i_op = &exofs_symlink_inode_operations;
989 inode->i_mapping->a_ops = &exofs_aops;
991 } else {
992 inode->i_op = &exofs_special_inode_operations;
993 if (fcb.i_data[0])
994 init_special_inode(inode, inode->i_mode,
995 old_decode_dev(le32_to_cpu(fcb.i_data[0])));
996 else
997 init_special_inode(inode, inode->i_mode,
998 new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1001 unlock_new_inode(inode);
1002 return inode;
1004 bad_inode:
1005 iget_failed(inode);
1006 return ERR_PTR(ret);
1009 int __exofs_wait_obj_created(struct exofs_i_info *oi)
1011 if (!obj_created(oi)) {
1012 BUG_ON(!obj_2bcreated(oi));
1013 wait_event(oi->i_wq, obj_created(oi));
1015 return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1018 * Callback function from exofs_new_inode(). The important thing is that we
1019 * set the obj_created flag so that other methods know that the object exists on
1020 * the OSD.
1022 static void create_done(struct osd_request *or, void *p)
1024 struct inode *inode = p;
1025 struct exofs_i_info *oi = exofs_i(inode);
1026 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1027 int ret;
1029 ret = exofs_check_ok(or);
1030 osd_end_request(or);
1031 atomic_dec(&sbi->s_curr_pending);
1033 if (unlikely(ret)) {
1034 EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx",
1035 _LLU(sbi->s_pid), _LLU(inode->i_ino + EXOFS_OBJ_OFF));
1036 make_bad_inode(inode);
1037 } else
1038 set_obj_created(oi);
1040 atomic_dec(&inode->i_count);
1041 wake_up(&oi->i_wq);
1045 * Set up a new inode and create an object for it on the OSD
1047 struct inode *exofs_new_inode(struct inode *dir, int mode)
1049 struct super_block *sb;
1050 struct inode *inode;
1051 struct exofs_i_info *oi;
1052 struct exofs_sb_info *sbi;
1053 struct osd_request *or;
1054 struct osd_obj_id obj;
1055 int ret;
1057 sb = dir->i_sb;
1058 inode = new_inode(sb);
1059 if (!inode)
1060 return ERR_PTR(-ENOMEM);
1062 oi = exofs_i(inode);
1064 init_waitqueue_head(&oi->i_wq);
1065 set_obj_2bcreated(oi);
1067 sbi = sb->s_fs_info;
1069 sb->s_dirt = 1;
1070 inode->i_uid = current->cred->fsuid;
1071 if (dir->i_mode & S_ISGID) {
1072 inode->i_gid = dir->i_gid;
1073 if (S_ISDIR(mode))
1074 mode |= S_ISGID;
1075 } else {
1076 inode->i_gid = current->cred->fsgid;
1078 inode->i_mode = mode;
1080 inode->i_ino = sbi->s_nextid++;
1081 inode->i_blkbits = EXOFS_BLKSHIFT;
1082 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1083 oi->i_commit_size = inode->i_size = 0;
1084 spin_lock(&sbi->s_next_gen_lock);
1085 inode->i_generation = sbi->s_next_generation++;
1086 spin_unlock(&sbi->s_next_gen_lock);
1087 insert_inode_hash(inode);
1089 mark_inode_dirty(inode);
1091 obj.partition = sbi->s_pid;
1092 obj.id = inode->i_ino + EXOFS_OBJ_OFF;
1093 exofs_make_credential(oi->i_cred, &obj);
1095 or = osd_start_request(sbi->s_dev, GFP_KERNEL);
1096 if (unlikely(!or)) {
1097 EXOFS_ERR("exofs_new_inode: osd_start_request failed\n");
1098 return ERR_PTR(-ENOMEM);
1101 osd_req_create_object(or, &obj);
1103 /* increment the refcount so that the inode will still be around when we
1104 * reach the callback
1106 atomic_inc(&inode->i_count);
1108 ret = exofs_async_op(or, create_done, inode, oi->i_cred);
1109 if (ret) {
1110 atomic_dec(&inode->i_count);
1111 osd_end_request(or);
1112 return ERR_PTR(-EIO);
1114 atomic_inc(&sbi->s_curr_pending);
1116 return inode;
1120 * struct to pass two arguments to update_inode's callback
1122 struct updatei_args {
1123 struct exofs_sb_info *sbi;
1124 struct exofs_fcb fcb;
1128 * Callback function from exofs_update_inode().
1130 static void updatei_done(struct osd_request *or, void *p)
1132 struct updatei_args *args = p;
1134 osd_end_request(or);
1136 atomic_dec(&args->sbi->s_curr_pending);
1138 kfree(args);
1142 * Write the inode to the OSD. Just fill up the struct, and set the attribute
1143 * synchronously or asynchronously depending on the do_sync flag.
1145 static int exofs_update_inode(struct inode *inode, int do_sync)
1147 struct exofs_i_info *oi = exofs_i(inode);
1148 struct super_block *sb = inode->i_sb;
1149 struct exofs_sb_info *sbi = sb->s_fs_info;
1150 struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
1151 struct osd_request *or;
1152 struct osd_attr attr;
1153 struct exofs_fcb *fcb;
1154 struct updatei_args *args;
1155 int ret;
1157 args = kzalloc(sizeof(*args), GFP_KERNEL);
1158 if (!args)
1159 return -ENOMEM;
1161 fcb = &args->fcb;
1163 fcb->i_mode = cpu_to_le16(inode->i_mode);
1164 fcb->i_uid = cpu_to_le32(inode->i_uid);
1165 fcb->i_gid = cpu_to_le32(inode->i_gid);
1166 fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1167 fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1168 fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1169 fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1170 oi->i_commit_size = i_size_read(inode);
1171 fcb->i_size = cpu_to_le64(oi->i_commit_size);
1172 fcb->i_generation = cpu_to_le32(inode->i_generation);
1174 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1175 if (old_valid_dev(inode->i_rdev)) {
1176 fcb->i_data[0] =
1177 cpu_to_le32(old_encode_dev(inode->i_rdev));
1178 fcb->i_data[1] = 0;
1179 } else {
1180 fcb->i_data[0] = 0;
1181 fcb->i_data[1] =
1182 cpu_to_le32(new_encode_dev(inode->i_rdev));
1183 fcb->i_data[2] = 0;
1185 } else
1186 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1188 or = osd_start_request(sbi->s_dev, GFP_KERNEL);
1189 if (unlikely(!or)) {
1190 EXOFS_ERR("exofs_update_inode: osd_start_request failed.\n");
1191 ret = -ENOMEM;
1192 goto free_args;
1195 osd_req_set_attributes(or, &obj);
1197 attr = g_attr_inode_data;
1198 attr.val_ptr = fcb;
1199 osd_req_add_set_attr_list(or, &attr, 1);
1201 if (!obj_created(oi)) {
1202 EXOFS_DBGMSG("!obj_created\n");
1203 BUG_ON(!obj_2bcreated(oi));
1204 wait_event(oi->i_wq, obj_created(oi));
1205 EXOFS_DBGMSG("wait_event done\n");
1208 if (do_sync) {
1209 ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
1210 osd_end_request(or);
1211 goto free_args;
1212 } else {
1213 args->sbi = sbi;
1215 ret = exofs_async_op(or, updatei_done, args, oi->i_cred);
1216 if (ret) {
1217 osd_end_request(or);
1218 goto free_args;
1220 atomic_inc(&sbi->s_curr_pending);
1221 goto out; /* deallocation in updatei_done */
1224 free_args:
1225 kfree(args);
1226 out:
1227 EXOFS_DBGMSG("ret=>%d\n", ret);
1228 return ret;
1231 int exofs_write_inode(struct inode *inode, int wait)
1233 return exofs_update_inode(inode, wait);
1237 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1238 * do.
1240 static void delete_done(struct osd_request *or, void *p)
1242 struct exofs_sb_info *sbi;
1243 osd_end_request(or);
1244 sbi = p;
1245 atomic_dec(&sbi->s_curr_pending);
1249 * Called when the refcount of an inode reaches zero. We remove the object
1250 * from the OSD here. We make sure the object was created before we try and
1251 * delete it.
1253 void exofs_delete_inode(struct inode *inode)
1255 struct exofs_i_info *oi = exofs_i(inode);
1256 struct super_block *sb = inode->i_sb;
1257 struct exofs_sb_info *sbi = sb->s_fs_info;
1258 struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
1259 struct osd_request *or;
1260 int ret;
1262 truncate_inode_pages(&inode->i_data, 0);
1264 if (is_bad_inode(inode))
1265 goto no_delete;
1267 mark_inode_dirty(inode);
1268 exofs_update_inode(inode, inode_needs_sync(inode));
1270 inode->i_size = 0;
1271 if (inode->i_blocks)
1272 exofs_truncate(inode);
1274 clear_inode(inode);
1276 or = osd_start_request(sbi->s_dev, GFP_KERNEL);
1277 if (unlikely(!or)) {
1278 EXOFS_ERR("exofs_delete_inode: osd_start_request failed\n");
1279 return;
1282 osd_req_remove_object(or, &obj);
1284 /* if we are deleting an obj that hasn't been created yet, wait */
1285 if (!obj_created(oi)) {
1286 BUG_ON(!obj_2bcreated(oi));
1287 wait_event(oi->i_wq, obj_created(oi));
1290 ret = exofs_async_op(or, delete_done, sbi, oi->i_cred);
1291 if (ret) {
1292 EXOFS_ERR(
1293 "ERROR: @exofs_delete_inode exofs_async_op failed\n");
1294 osd_end_request(or);
1295 return;
1297 atomic_inc(&sbi->s_curr_pending);
1299 return;
1301 no_delete:
1302 clear_inode(inode);