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f2fs: avoid crash when trace f2fs_submit_page_mbio event in ra_sum_pages 

Previously we allocate pages with no mapping in ra_sum_pages(), so we may
encounter a crash in event trace of f2fs_submit_page_mbio where we access
mapping data of the page.

We'd better allocate pages in bd_inode mapping and invalidate these pages after
we restore data from pages. It could avoid crash in above scenario.

Changes from V1
 o remove redundant code in ra_sum_pages() suggested by Jaegeuk Kim.

Call Trace:
 [<f1031630>] ? ftrace_raw_event_f2fs_write_checkpoint+0x80/0x80 [f2fs]
 [<f10377bb>] f2fs_submit_page_mbio+0x1cb/0x200 [f2fs]
 [<f103c5da>] restore_node_summary+0x13a/0x280 [f2fs]
 [<f103e22d>] build_curseg+0x2bd/0x620 [f2fs]
 [<f104043b>] build_segment_manager+0x1cb/0x920 [f2fs]
 [<f1032c85>] f2fs_fill_super+0x535/0x8e0 [f2fs]
 [<c115b66a>] mount_bdev+0x16a/0x1a0
 [<f102f63f>] f2fs_mount+0x1f/0x30 [f2fs]
 [<c115c096>] mount_fs+0x36/0x170
 [<c1173635>] vfs_kern_mount+0x55/0xe0
 [<c1175388>] do_mount+0x1e8/0x900
 [<c1175d72>] SyS_mount+0x82/0xc0
 [<c16059cc>] sysenter_do_call+0x12/0x22

Suggested-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2014-05-27 08:41:07 +08:00 committed by Jaegeuk Kim
parent bfec07d0f8
commit bac4eef653
1 changed files with 24 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
fs/f2fs/node.c
View File

@ -1658,35 +1658,29 @@ int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
/*
* ra_sum_pages() merge contiguous pages into one bio and submit.
* these pre-readed pages are linked in pages list.
* these pre-readed pages are alloced in bd_inode's mapping tree.
*/
static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages,
static int ra_sum_pages(struct f2fs_sb_info *sbi, struct page **pages,
int start, int nrpages)
{
struct page *page;
int page_idx = start;
struct inode *inode = sbi->sb->s_bdev->bd_inode;
struct address_space *mapping = inode->i_mapping;
int i, page_idx = start;
struct f2fs_io_info fio = {
.type = META,
.rw = READ_SYNC | REQ_META | REQ_PRIO
};
for (; page_idx < start + nrpages; page_idx++) {
/* alloc temporal page for read node summary info*/
page = alloc_page(GFP_F2FS_ZERO);
if (!page)
for (i = 0; page_idx < start + nrpages; page_idx++, i++) {
/* alloc page in bd_inode for reading node summary info */
pages[i] = grab_cache_page(mapping, page_idx);
if (!pages[i])
break;
lock_page(page);
page->index = page_idx;
list_add_tail(&page->lru, pages);
f2fs_submit_page_mbio(sbi, pages[i], page_idx, &fio);
}
list_for_each_entry(page, pages, lru)
f2fs_submit_page_mbio(sbi, page, page->index, &fio);
f2fs_submit_merged_bio(sbi, META, READ);
return page_idx - start;
return i;
}
int restore_node_summary(struct f2fs_sb_info *sbi,
@ -1694,11 +1688,11 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
{
struct f2fs_node *rn;
struct f2fs_summary *sum_entry;
struct page *page, *tmp;
struct inode *inode = sbi->sb->s_bdev->bd_inode;
block_t addr;
int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
int i, last_offset, nrpages, err = 0;
LIST_HEAD(page_list);
struct page *pages[bio_blocks];
int i, idx, last_offset, nrpages, err = 0;
/* scan the node segment */
last_offset = sbi->blocks_per_seg;
@ -1709,29 +1703,31 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
nrpages = min(last_offset - i, bio_blocks);
/* read ahead node pages */
nrpages = ra_sum_pages(sbi, &page_list, addr, nrpages);
nrpages = ra_sum_pages(sbi, pages, addr, nrpages);
if (!nrpages)
return -ENOMEM;
list_for_each_entry_safe(page, tmp, &page_list, lru) {
for (idx = 0; idx < nrpages; idx++) {
if (err)
goto skip;
lock_page(page);
if (unlikely(!PageUptodate(page))) {
lock_page(pages[idx]);
if (unlikely(!PageUptodate(pages[idx]))) {
err = -EIO;
} else {
rn = F2FS_NODE(page);
rn = F2FS_NODE(pages[idx]);
sum_entry->nid = rn->footer.nid;
sum_entry->version = 0;
sum_entry->ofs_in_node = 0;
sum_entry++;
}
unlock_page(page);
unlock_page(pages[idx]);
skip:
list_del(&page->lru);
__free_pages(page, 0);
page_cache_release(pages[idx]);
}
invalidate_mapping_pages(inode->i_mapping, addr,
addr + nrpages);
}
return err;
}