2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
7 * Copyrights for code taken from ext2:
8 * Copyright (C) 1992, 1993, 1994, 1995
9 * Remy Card (card@masi.ibp.fr)
10 * Laboratoire MASI - Institut Blaise Pascal
11 * Universite Pierre et Marie Curie (Paris VI)
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * This file is part of exofs.
18 * exofs is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation. Since it is based on ext2, and the only
21 * valid version of GPL for the Linux kernel is version 2, the only valid
22 * version of GPL for exofs is version 2.
24 * exofs is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with exofs; if not, write to the Free Software
31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
34 #include <linux/slab.h>
38 #define EXOFS_DBGMSG2(M...) do {} while (0)
40 enum { BIO_MAX_PAGES_KMALLOC =
41 (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
43 PAGE_SIZE / sizeof(struct page *),
46 unsigned exofs_max_io_pages(struct exofs_layout *layout,
47 unsigned expected_pages)
49 unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
51 /* TODO: easily support bio chaining */
52 pages = min_t(unsigned, pages,
53 layout->group_width * BIO_MAX_PAGES_KMALLOC);
58 struct exofs_sb_info *sbi;
60 unsigned expected_pages;
61 struct exofs_io_state *ios;
67 loff_t pg_first; /* keep 64bit also in 32-arches */
68 bool read_4_write; /* This means two things: that the read is sync
69 * And the pages should not be unlocked.
73 static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
76 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
80 pcol->expected_pages = expected_pages;
84 pcol->alloc_pages = 0;
88 pcol->read_4_write = false;
91 static void _pcol_reset(struct page_collect *pcol)
93 pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
96 pcol->alloc_pages = 0;
102 /* this is probably the end of the loop but in writes
103 * it might not end here. don't be left with nothing
105 if (!pcol->expected_pages)
106 pcol->expected_pages = MAX_PAGES_KMALLOC;
109 static int pcol_try_alloc(struct page_collect *pcol)
113 /* TODO: easily support bio chaining */
114 pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
116 for (; pages; pages >>= 1) {
117 pcol->pages = kmalloc(pages * sizeof(struct page *),
119 if (likely(pcol->pages)) {
120 pcol->alloc_pages = pages;
125 EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
126 pcol->expected_pages);
130 static void pcol_free(struct page_collect *pcol)
136 exofs_put_io_state(pcol->ios);
141 static int pcol_add_page(struct page_collect *pcol, struct page *page,
144 if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
147 pcol->pages[pcol->nr_pages++] = page;
152 static int update_read_page(struct page *page, int ret)
155 /* Everything is OK */
156 SetPageUptodate(page);
158 ClearPageError(page);
159 } else if (ret == -EFAULT) {
160 /* In this case we were trying to read something that wasn't on
161 * disk yet - return a page full of zeroes. This should be OK,
162 * because the object should be empty (if there was a write
163 * before this read, the read would be waiting with the page
165 clear_highpage(page);
167 SetPageUptodate(page);
169 ClearPageError(page);
170 ret = 0; /* recovered error */
171 EXOFS_DBGMSG("recovered read error\n");
178 static void update_write_page(struct page *page, int ret)
181 mapping_set_error(page->mapping, ret);
184 end_page_writeback(page);
187 /* Called at the end of reads, to optionally unlock pages and update their
190 static int __readpages_done(struct page_collect *pcol)
196 int ret = exofs_check_io(pcol->ios, &resid);
199 good_bytes = pcol->length;
201 good_bytes = pcol->length - resid;
203 EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
204 " length=0x%lx nr_pages=%u\n",
205 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
208 for (i = 0; i < pcol->nr_pages; i++) {
209 struct page *page = pcol->pages[i];
210 struct inode *inode = page->mapping->host;
213 if (inode != pcol->inode)
214 continue; /* osd might add more pages at end */
216 if (likely(length < good_bytes))
221 EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n",
222 inode->i_ino, page->index,
223 page_stat ? "bad_bytes" : "good_bytes");
225 ret = update_read_page(page, page_stat);
226 if (!pcol->read_4_write)
232 EXOFS_DBGMSG2("readpages_done END\n");
236 /* callback of async reads */
237 static void readpages_done(struct exofs_io_state *ios, void *p)
239 struct page_collect *pcol = p;
241 __readpages_done(pcol);
242 atomic_dec(&pcol->sbi->s_curr_pending);
246 static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
250 for (i = 0; i < pcol->nr_pages; i++) {
251 struct page *page = pcol->pages[i];
254 update_read_page(page, ret);
256 update_write_page(page, ret);
262 static int read_exec(struct page_collect *pcol)
264 struct exofs_i_info *oi = exofs_i(pcol->inode);
265 struct exofs_io_state *ios;
266 struct page_collect *pcol_copy = NULL;
273 int ret = exofs_get_rw_state(&pcol->sbi->layout, true,
274 pcol->pg_first << PAGE_CACHE_SHIFT,
275 pcol->length, &pcol->ios);
282 ios->pages = pcol->pages;
283 ios->nr_pages = pcol->nr_pages;
285 if (pcol->read_4_write) {
286 exofs_oi_read(oi, pcol->ios);
287 return __readpages_done(pcol);
290 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
297 ios->done = readpages_done;
298 ios->private = pcol_copy;
299 ret = exofs_oi_read(oi, ios);
303 atomic_inc(&pcol->sbi->s_curr_pending);
305 EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
306 ios->obj.id, _LLU(ios->offset), pcol->length);
308 /* pages ownership was passed to pcol_copy */
313 if (!pcol->read_4_write)
314 _unlock_pcol_pages(pcol, ret, READ);
322 /* readpage_strip is called either directly from readpage() or by the VFS from
323 * within read_cache_pages(), to add one more page to be read. It will try to
324 * collect as many contiguous pages as posible. If a discontinuity is
325 * encountered, or it runs out of resources, it will submit the previous segment
326 * and will start a new collection. Eventually caller must submit the last
327 * segment if present.
329 static int readpage_strip(void *data, struct page *page)
331 struct page_collect *pcol = data;
332 struct inode *inode = pcol->inode;
333 struct exofs_i_info *oi = exofs_i(inode);
334 loff_t i_size = i_size_read(inode);
335 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
339 /* FIXME: Just for debugging, will be removed */
340 if (PageUptodate(page))
341 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
344 if (page->index < end_index)
345 len = PAGE_CACHE_SIZE;
346 else if (page->index == end_index)
347 len = i_size & ~PAGE_CACHE_MASK;
351 if (!len || !obj_created(oi)) {
352 /* this will be out of bounds, or doesn't exist yet.
353 * Current page is cleared and the request is split
355 clear_highpage(page);
357 SetPageUptodate(page);
359 ClearPageError(page);
361 if (!pcol->read_4_write)
363 EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
364 "read_4_write=%d index=0x%lx end_index=0x%lx "
365 "splitting\n", inode->i_ino, len,
366 pcol->read_4_write, page->index, end_index);
368 return read_exec(pcol);
373 if (unlikely(pcol->pg_first == -1)) {
374 pcol->pg_first = page->index;
375 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
377 /* Discontinuity detected, split the request */
378 ret = read_exec(pcol);
385 ret = pcol_try_alloc(pcol);
390 if (len != PAGE_CACHE_SIZE)
391 zero_user(page, len, PAGE_CACHE_SIZE - len);
393 EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
394 inode->i_ino, page->index, len);
396 ret = pcol_add_page(pcol, page, len);
398 EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
399 "this_len=0x%zx nr_pages=%u length=0x%lx\n",
400 page, len, pcol->nr_pages, pcol->length);
402 /* split the request, and start again with current page */
403 ret = read_exec(pcol);
413 /* SetPageError(page); ??? */
418 static int exofs_readpages(struct file *file, struct address_space *mapping,
419 struct list_head *pages, unsigned nr_pages)
421 struct page_collect pcol;
424 _pcol_init(&pcol, nr_pages, mapping->host);
426 ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
428 EXOFS_ERR("read_cache_pages => %d\n", ret);
432 return read_exec(&pcol);
435 static int _readpage(struct page *page, bool read_4_write)
437 struct page_collect pcol;
440 _pcol_init(&pcol, 1, page->mapping->host);
442 pcol.read_4_write = read_4_write;
443 ret = readpage_strip(&pcol, page);
445 EXOFS_ERR("_readpage => %d\n", ret);
449 return read_exec(&pcol);
453 * We don't need the file
455 static int exofs_readpage(struct file *file, struct page *page)
457 return _readpage(page, false);
460 /* Callback for osd_write. All writes are asynchronous */
461 static void writepages_done(struct exofs_io_state *ios, void *p)
463 struct page_collect *pcol = p;
468 int ret = exofs_check_io(ios, &resid);
470 atomic_dec(&pcol->sbi->s_curr_pending);
473 good_bytes = pcol->length;
475 good_bytes = pcol->length - resid;
477 EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
478 " length=0x%lx nr_pages=%u\n",
479 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
482 for (i = 0; i < pcol->nr_pages; i++) {
483 struct page *page = pcol->pages[i];
484 struct inode *inode = page->mapping->host;
487 if (inode != pcol->inode)
488 continue; /* osd might add more pages to a bio */
490 if (likely(length < good_bytes))
495 update_write_page(page, page_stat);
497 EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
498 inode->i_ino, page->index, page_stat);
505 EXOFS_DBGMSG2("writepages_done END\n");
508 static int write_exec(struct page_collect *pcol)
510 struct exofs_i_info *oi = exofs_i(pcol->inode);
511 struct exofs_io_state *ios;
512 struct page_collect *pcol_copy = NULL;
519 ret = exofs_get_rw_state(&pcol->sbi->layout, false,
520 pcol->pg_first << PAGE_CACHE_SHIFT,
521 pcol->length, &pcol->ios);
526 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
528 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
536 ios->pages = pcol_copy->pages;
537 ios->nr_pages = pcol_copy->nr_pages;
538 ios->done = writepages_done;
539 ios->private = pcol_copy;
541 ret = exofs_oi_write(oi, ios);
543 EXOFS_ERR("write_exec: exofs_oi_write() Failed\n");
547 atomic_inc(&pcol->sbi->s_curr_pending);
548 EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n",
549 pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset),
551 /* pages ownership was passed to pcol_copy */
556 _unlock_pcol_pages(pcol, ret, WRITE);
563 /* writepage_strip is called either directly from writepage() or by the VFS from
564 * within write_cache_pages(), to add one more page to be written to storage.
565 * It will try to collect as many contiguous pages as possible. If a
566 * discontinuity is encountered or it runs out of resources it will submit the
567 * previous segment and will start a new collection.
568 * Eventually caller must submit the last segment if present.
570 static int writepage_strip(struct page *page,
571 struct writeback_control *wbc_unused, void *data)
573 struct page_collect *pcol = data;
574 struct inode *inode = pcol->inode;
575 struct exofs_i_info *oi = exofs_i(inode);
576 loff_t i_size = i_size_read(inode);
577 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
581 BUG_ON(!PageLocked(page));
583 ret = wait_obj_created(oi);
587 if (page->index < end_index)
588 /* in this case, the page is within the limits of the file */
589 len = PAGE_CACHE_SIZE;
591 len = i_size & ~PAGE_CACHE_MASK;
593 if (page->index > end_index || !len) {
594 /* in this case, the page is outside the limits
595 * (truncate in progress)
597 ret = write_exec(pcol);
601 ClearPageError(page);
603 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
604 "outside the limits\n",
605 inode->i_ino, page->index);
612 if (unlikely(pcol->pg_first == -1)) {
613 pcol->pg_first = page->index;
614 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
616 /* Discontinuity detected, split the request */
617 ret = write_exec(pcol);
621 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
622 inode->i_ino, page->index);
627 ret = pcol_try_alloc(pcol);
632 EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
633 inode->i_ino, page->index, len);
635 ret = pcol_add_page(pcol, page, len);
637 EXOFS_DBGMSG2("Failed pcol_add_page "
638 "nr_pages=%u total_length=0x%lx\n",
639 pcol->nr_pages, pcol->length);
641 /* split the request, next loop will start again */
642 ret = write_exec(pcol);
644 EXOFS_DBGMSG("write_exec failed => %d", ret);
651 BUG_ON(PageWriteback(page));
652 set_page_writeback(page);
657 EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
658 inode->i_ino, page->index, ret);
659 set_bit(AS_EIO, &page->mapping->flags);
664 static int exofs_writepages(struct address_space *mapping,
665 struct writeback_control *wbc)
667 struct page_collect pcol;
668 long start, end, expected_pages;
671 start = wbc->range_start >> PAGE_CACHE_SHIFT;
672 end = (wbc->range_end == LLONG_MAX) ?
673 start + mapping->nrpages :
674 wbc->range_end >> PAGE_CACHE_SHIFT;
677 expected_pages = end - start + 1;
679 expected_pages = mapping->nrpages;
681 if (expected_pages < 32L)
682 expected_pages = 32L;
684 EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
685 "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
686 mapping->host->i_ino, wbc->range_start, wbc->range_end,
687 mapping->nrpages, start, end, expected_pages);
689 _pcol_init(&pcol, expected_pages, mapping->host);
691 ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
693 EXOFS_ERR("write_cache_pages => %d\n", ret);
697 return write_exec(&pcol);
700 static int exofs_writepage(struct page *page, struct writeback_control *wbc)
702 struct page_collect pcol;
705 _pcol_init(&pcol, 1, page->mapping->host);
707 ret = writepage_strip(page, NULL, &pcol);
709 EXOFS_ERR("exofs_writepage => %d\n", ret);
713 return write_exec(&pcol);
716 /* i_mutex held using inode->i_size directly */
717 static void _write_failed(struct inode *inode, loff_t to)
719 if (to > inode->i_size)
720 truncate_pagecache(inode, to, inode->i_size);
723 int exofs_write_begin(struct file *file, struct address_space *mapping,
724 loff_t pos, unsigned len, unsigned flags,
725 struct page **pagep, void **fsdata)
732 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
735 EXOFS_DBGMSG("simple_write_begin failed\n");
742 /* read modify write */
743 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
744 loff_t i_size = i_size_read(mapping->host);
745 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
748 if (page->index < end_index)
749 rlen = PAGE_CACHE_SIZE;
750 else if (page->index == end_index)
751 rlen = i_size & ~PAGE_CACHE_MASK;
756 clear_highpage(page);
757 SetPageUptodate(page);
761 ret = _readpage(page, true);
763 /*SetPageError was done by _readpage. Is it ok?*/
765 EXOFS_DBGMSG("__readpage failed\n");
770 _write_failed(mapping->host, pos + len);
775 static int exofs_write_begin_export(struct file *file,
776 struct address_space *mapping,
777 loff_t pos, unsigned len, unsigned flags,
778 struct page **pagep, void **fsdata)
782 return exofs_write_begin(file, mapping, pos, len, flags, pagep,
786 static int exofs_write_end(struct file *file, struct address_space *mapping,
787 loff_t pos, unsigned len, unsigned copied,
788 struct page *page, void *fsdata)
790 struct inode *inode = mapping->host;
791 /* According to comment in simple_write_end i_mutex is held */
792 loff_t i_size = inode->i_size;
795 ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
797 _write_failed(inode, pos + len);
799 /* TODO: once simple_write_end marks inode dirty remove */
800 if (i_size != inode->i_size)
801 mark_inode_dirty(inode);
805 static int exofs_releasepage(struct page *page, gfp_t gfp)
807 EXOFS_DBGMSG("page 0x%lx\n", page->index);
812 static void exofs_invalidatepage(struct page *page, unsigned long offset)
814 EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset);
818 const struct address_space_operations exofs_aops = {
819 .readpage = exofs_readpage,
820 .readpages = exofs_readpages,
821 .writepage = exofs_writepage,
822 .writepages = exofs_writepages,
823 .write_begin = exofs_write_begin_export,
824 .write_end = exofs_write_end,
825 .releasepage = exofs_releasepage,
826 .set_page_dirty = __set_page_dirty_nobuffers,
827 .invalidatepage = exofs_invalidatepage,
829 /* Not implemented Yet */
830 .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
831 .direct_IO = NULL, /* TODO: Should be trivial to do */
833 /* With these NULL has special meaning or default is not exported */
836 .launder_page = NULL,
837 .is_partially_uptodate = NULL,
838 .error_remove_page = NULL,
841 /******************************************************************************
843 *****************************************************************************/
846 * Test whether an inode is a fast symlink.
848 static inline int exofs_inode_is_fast_symlink(struct inode *inode)
850 struct exofs_i_info *oi = exofs_i(inode);
852 return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
855 const struct osd_attr g_attr_logical_length = ATTR_DEF(
856 OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
858 static int _do_truncate(struct inode *inode, loff_t newsize)
860 struct exofs_i_info *oi = exofs_i(inode);
863 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
865 ret = exofs_oi_truncate(oi, (u64)newsize);
867 truncate_setsize(inode, newsize);
869 EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
870 inode->i_ino, newsize, ret);
875 * Set inode attributes - update size attribute on OSD if needed,
876 * otherwise just call generic functions.
878 int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
880 struct inode *inode = dentry->d_inode;
883 /* if we are about to modify an object, and it hasn't been
886 error = wait_obj_created(exofs_i(inode));
890 error = inode_change_ok(inode, iattr);
894 if ((iattr->ia_valid & ATTR_SIZE) &&
895 iattr->ia_size != i_size_read(inode)) {
896 error = _do_truncate(inode, iattr->ia_size);
901 setattr_copy(inode, iattr);
902 mark_inode_dirty(inode);
906 static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
908 EXOFS_ATTR_INODE_FILE_LAYOUT,
910 static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
912 EXOFS_ATTR_INODE_DIR_LAYOUT,
916 * Read the Linux inode info from the OSD, and return it as is. In exofs the
917 * inode info is in an application specific page/attribute of the osd-object.
919 static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
920 struct exofs_fcb *inode)
922 struct exofs_sb_info *sbi = sb->s_fs_info;
923 struct osd_attr attrs[] = {
924 [0] = g_attr_inode_data,
925 [1] = g_attr_inode_file_layout,
926 [2] = g_attr_inode_dir_layout,
928 struct exofs_io_state *ios;
929 struct exofs_on_disk_inode_layout *layout;
932 ret = exofs_get_io_state(&sbi->layout, &ios);
934 EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
938 ios->obj.id = exofs_oi_objno(oi);
939 exofs_make_credential(oi->i_cred, &ios->obj);
940 ios->cred = oi->i_cred;
942 attrs[1].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs);
943 attrs[2].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs);
945 ios->in_attr = attrs;
946 ios->in_attr_len = ARRAY_SIZE(attrs);
948 ret = exofs_sbi_read(ios);
950 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
951 _LLU(ios->obj.id), ret);
952 memset(inode, 0, sizeof(*inode));
953 inode->i_mode = 0040000 | (0777 & ~022);
954 /* If object is lost on target we might as well enable it's
957 if ((ret == -ENOENT) || (ret == -EINVAL))
962 ret = extract_attr_from_ios(ios, &attrs[0]);
964 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
967 WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
968 memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
970 ret = extract_attr_from_ios(ios, &attrs[1]);
972 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
976 layout = attrs[1].val_ptr;
977 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
978 EXOFS_ERR("%s: unsupported files layout %d\n",
979 __func__, layout->gen_func);
985 ret = extract_attr_from_ios(ios, &attrs[2]);
987 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
991 layout = attrs[2].val_ptr;
992 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
993 EXOFS_ERR("%s: unsupported meta-data layout %d\n",
994 __func__, layout->gen_func);
1001 exofs_put_io_state(ios);
1005 static void __oi_init(struct exofs_i_info *oi)
1007 init_waitqueue_head(&oi->i_wq);
1011 * Fill in an inode read from the OSD and set it up for use
1013 struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1015 struct exofs_i_info *oi;
1016 struct exofs_fcb fcb;
1017 struct inode *inode;
1020 inode = iget_locked(sb, ino);
1022 return ERR_PTR(-ENOMEM);
1023 if (!(inode->i_state & I_NEW))
1025 oi = exofs_i(inode);
1028 /* read the inode from the osd */
1029 ret = exofs_get_inode(sb, oi, &fcb);
1033 set_obj_created(oi);
1035 /* copy stuff from on-disk struct to in-memory struct */
1036 inode->i_mode = le16_to_cpu(fcb.i_mode);
1037 inode->i_uid = le32_to_cpu(fcb.i_uid);
1038 inode->i_gid = le32_to_cpu(fcb.i_gid);
1039 inode->i_nlink = le16_to_cpu(fcb.i_links_count);
1040 inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1041 inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1042 inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1043 inode->i_ctime.tv_nsec =
1044 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1045 oi->i_commit_size = le64_to_cpu(fcb.i_size);
1046 i_size_write(inode, oi->i_commit_size);
1047 inode->i_blkbits = EXOFS_BLKSHIFT;
1048 inode->i_generation = le32_to_cpu(fcb.i_generation);
1050 oi->i_dir_start_lookup = 0;
1052 if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1057 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1060 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1063 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1065 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1068 inode->i_mapping->backing_dev_info = sb->s_bdi;
1069 if (S_ISREG(inode->i_mode)) {
1070 inode->i_op = &exofs_file_inode_operations;
1071 inode->i_fop = &exofs_file_operations;
1072 inode->i_mapping->a_ops = &exofs_aops;
1073 } else if (S_ISDIR(inode->i_mode)) {
1074 inode->i_op = &exofs_dir_inode_operations;
1075 inode->i_fop = &exofs_dir_operations;
1076 inode->i_mapping->a_ops = &exofs_aops;
1077 } else if (S_ISLNK(inode->i_mode)) {
1078 if (exofs_inode_is_fast_symlink(inode))
1079 inode->i_op = &exofs_fast_symlink_inode_operations;
1081 inode->i_op = &exofs_symlink_inode_operations;
1082 inode->i_mapping->a_ops = &exofs_aops;
1085 inode->i_op = &exofs_special_inode_operations;
1087 init_special_inode(inode, inode->i_mode,
1088 old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1090 init_special_inode(inode, inode->i_mode,
1091 new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1094 unlock_new_inode(inode);
1099 return ERR_PTR(ret);
1102 int __exofs_wait_obj_created(struct exofs_i_info *oi)
1104 if (!obj_created(oi)) {
1105 EXOFS_DBGMSG("!obj_created\n");
1106 BUG_ON(!obj_2bcreated(oi));
1107 wait_event(oi->i_wq, obj_created(oi));
1108 EXOFS_DBGMSG("wait_event done\n");
1110 return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1114 * Callback function from exofs_new_inode(). The important thing is that we
1115 * set the obj_created flag so that other methods know that the object exists on
1118 static void create_done(struct exofs_io_state *ios, void *p)
1120 struct inode *inode = p;
1121 struct exofs_i_info *oi = exofs_i(inode);
1122 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1125 ret = exofs_check_io(ios, NULL);
1126 exofs_put_io_state(ios);
1128 atomic_dec(&sbi->s_curr_pending);
1130 if (unlikely(ret)) {
1131 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1132 _LLU(exofs_oi_objno(oi)), _LLU(sbi->layout.s_pid));
1133 /*TODO: When FS is corrupted creation can fail, object already
1134 * exist. Get rid of this asynchronous creation, if exist
1135 * increment the obj counter and try the next object. Until we
1136 * succeed. All these dangling objects will be made into lost
1137 * files by chkfs.exofs
1141 set_obj_created(oi);
1147 * Set up a new inode and create an object for it on the OSD
1149 struct inode *exofs_new_inode(struct inode *dir, int mode)
1151 struct super_block *sb;
1152 struct inode *inode;
1153 struct exofs_i_info *oi;
1154 struct exofs_sb_info *sbi;
1155 struct exofs_io_state *ios;
1159 inode = new_inode(sb);
1161 return ERR_PTR(-ENOMEM);
1163 oi = exofs_i(inode);
1166 set_obj_2bcreated(oi);
1168 sbi = sb->s_fs_info;
1170 inode->i_mapping->backing_dev_info = sb->s_bdi;
1171 inode_init_owner(inode, dir, mode);
1172 inode->i_ino = sbi->s_nextid++;
1173 inode->i_blkbits = EXOFS_BLKSHIFT;
1174 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1175 oi->i_commit_size = inode->i_size = 0;
1176 spin_lock(&sbi->s_next_gen_lock);
1177 inode->i_generation = sbi->s_next_generation++;
1178 spin_unlock(&sbi->s_next_gen_lock);
1179 insert_inode_hash(inode);
1181 exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1183 mark_inode_dirty(inode);
1185 ret = exofs_get_io_state(&sbi->layout, &ios);
1186 if (unlikely(ret)) {
1187 EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n");
1188 return ERR_PTR(ret);
1191 ios->obj.id = exofs_oi_objno(oi);
1192 exofs_make_credential(oi->i_cred, &ios->obj);
1194 ios->done = create_done;
1195 ios->private = inode;
1196 ios->cred = oi->i_cred;
1197 ret = exofs_sbi_create(ios);
1199 exofs_put_io_state(ios);
1200 return ERR_PTR(ret);
1202 atomic_inc(&sbi->s_curr_pending);
1208 * struct to pass two arguments to update_inode's callback
1210 struct updatei_args {
1211 struct exofs_sb_info *sbi;
1212 struct exofs_fcb fcb;
1216 * Callback function from exofs_update_inode().
1218 static void updatei_done(struct exofs_io_state *ios, void *p)
1220 struct updatei_args *args = p;
1222 exofs_put_io_state(ios);
1224 atomic_dec(&args->sbi->s_curr_pending);
1230 * Write the inode to the OSD. Just fill up the struct, and set the attribute
1231 * synchronously or asynchronously depending on the do_sync flag.
1233 static int exofs_update_inode(struct inode *inode, int do_sync)
1235 struct exofs_i_info *oi = exofs_i(inode);
1236 struct super_block *sb = inode->i_sb;
1237 struct exofs_sb_info *sbi = sb->s_fs_info;
1238 struct exofs_io_state *ios;
1239 struct osd_attr attr;
1240 struct exofs_fcb *fcb;
1241 struct updatei_args *args;
1244 args = kzalloc(sizeof(*args), GFP_KERNEL);
1246 EXOFS_DBGMSG("Failed kzalloc of args\n");
1252 fcb->i_mode = cpu_to_le16(inode->i_mode);
1253 fcb->i_uid = cpu_to_le32(inode->i_uid);
1254 fcb->i_gid = cpu_to_le32(inode->i_gid);
1255 fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1256 fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1257 fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1258 fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1259 oi->i_commit_size = i_size_read(inode);
1260 fcb->i_size = cpu_to_le64(oi->i_commit_size);
1261 fcb->i_generation = cpu_to_le32(inode->i_generation);
1263 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1264 if (old_valid_dev(inode->i_rdev)) {
1266 cpu_to_le32(old_encode_dev(inode->i_rdev));
1271 cpu_to_le32(new_encode_dev(inode->i_rdev));
1275 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1277 ret = exofs_get_io_state(&sbi->layout, &ios);
1278 if (unlikely(ret)) {
1279 EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
1283 attr = g_attr_inode_data;
1285 ios->out_attr_len = 1;
1286 ios->out_attr = &attr;
1288 wait_obj_created(oi);
1292 ios->done = updatei_done;
1293 ios->private = args;
1296 ret = exofs_oi_write(oi, ios);
1297 if (!do_sync && !ret) {
1298 atomic_inc(&sbi->s_curr_pending);
1299 goto out; /* deallocation in updatei_done */
1302 exofs_put_io_state(ios);
1306 EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1307 inode->i_ino, do_sync, ret);
1311 int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1313 /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1314 return exofs_update_inode(inode, 1);
1318 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1321 static void delete_done(struct exofs_io_state *ios, void *p)
1323 struct exofs_sb_info *sbi = p;
1325 exofs_put_io_state(ios);
1327 atomic_dec(&sbi->s_curr_pending);
1331 * Called when the refcount of an inode reaches zero. We remove the object
1332 * from the OSD here. We make sure the object was created before we try and
1335 void exofs_evict_inode(struct inode *inode)
1337 struct exofs_i_info *oi = exofs_i(inode);
1338 struct super_block *sb = inode->i_sb;
1339 struct exofs_sb_info *sbi = sb->s_fs_info;
1340 struct exofs_io_state *ios;
1343 truncate_inode_pages(&inode->i_data, 0);
1345 /* TODO: should do better here */
1346 if (inode->i_nlink || is_bad_inode(inode))
1350 end_writeback(inode);
1352 /* if we are deleting an obj that hasn't been created yet, wait.
1353 * This also makes sure that create_done cannot be called with an
1354 * already evicted inode.
1356 wait_obj_created(oi);
1357 /* ignore the error, attempt a remove anyway */
1359 /* Now Remove the OSD objects */
1360 ret = exofs_get_io_state(&sbi->layout, &ios);
1361 if (unlikely(ret)) {
1362 EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__);
1366 ios->obj.id = exofs_oi_objno(oi);
1367 ios->done = delete_done;
1369 ios->cred = oi->i_cred;
1370 ret = exofs_sbi_remove(ios);
1372 EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__);
1373 exofs_put_io_state(ios);
1376 atomic_inc(&sbi->s_curr_pending);
1381 end_writeback(inode);