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| author | Gu Zheng <guz.fnst@cn.fujitsu.com> | 2014-01-20 18:37:30 +0800 |
|---|---|---|
| committer | rogersb11 <brettrogers11@gmail.com> | 2016-02-13 21:45:56 -0500 |
| commit | 9e1423bdc50a030ca9ea0c5c807c427c6ed02daf (patch) | |
| tree | d5780a3c2822e6ad20f08d5393c9637624e8c870 | |
| parent | 11acf312c7ff169cc3710db49119d47d111b1696 (diff) | |
| download | kernel_samsung_smdk4412-9e1423bdc50a030ca9ea0c5c807c427c6ed02daf.zip kernel_samsung_smdk4412-9e1423bdc50a030ca9ea0c5c807c427c6ed02daf.tar.gz kernel_samsung_smdk4412-9e1423bdc50a030ca9ea0c5c807c427c6ed02daf.tar.bz2 | |
f2fs: remove the orphan block page array
As the orphan_blocks may be max to 504, so it is not security
and rigorous to store such a large array in the kernel stack
as Dan Carpenter said.
In fact, grab_meta_page has locked the page in the page cache,
and we can use find_get_page() to fetch the page safely in the
downstream, so we can remove the page array directly.
Change-Id: Ie73897038bc06f6a6342d6fbdab8f8ff36b2cd96
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
| -rw-r--r-- | fs/f2fs/checkpoint.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index f9d4f7d..ed82de6 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -311,11 +311,10 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk) unsigned short orphan_blocks = (unsigned short)((sbi->n_orphans + (F2FS_ORPHANS_PER_BLOCK - 1)) / F2FS_ORPHANS_PER_BLOCK); struct page *page = NULL; - struct page *pages[orphan_blocks]; struct orphan_inode_entry *orphan = NULL; for (index = 0; index < orphan_blocks; index++) - pages[index] = grab_meta_page(sbi, start_blk + index); + grab_meta_page(sbi, start_blk + index); index = 1; spin_lock(&sbi->orphan_inode_lock); @@ -324,10 +323,12 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk) /* loop for each orphan inode entry and write them in Jornal block */ list_for_each_entry(orphan, head, list) { if (!page) { - page = pages[index - 1]; + page = find_get_page(META_MAPPING(sbi), start_blk++); + f2fs_bug_on(!page); orphan_blk = (struct f2fs_orphan_block *)page_address(page); memset(orphan_blk, 0, sizeof(*orphan_blk)); + f2fs_put_page(page, 0); } orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino); |