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| author | Chao Yu <chao2.yu@samsung.com> | 2013-12-05 09:54:56 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-12-23 10:18:06 +0900 |
| commit | b9987a277f1ec9dba203d04c3a20d967c01a1fba (patch) | |
| tree | abb337cbc3d88aaa49836c191aa4f33e2226de43 /fs/f2fs/recovery.c | |
| parent | a0acdfe05a954363861a65eb537573ab417cb7ed (diff) | |
| download | linux-b9987a277f1ec9dba203d04c3a20d967c01a1fba.tar.gz | |
f2fs: avoid unneeded page release for correct _count of page
In find_fsync_dnodes() and recover_data(), our flow is like this: ->f2fs_submit_page_bio() -> f2fs_put_page() -> page_cache_release() ---- page->_count declined to zero. ->__free_pages() -> put_page_testzero() ---- page->_count will be declined again. We will get a segment fault in put_page_testzero when CONFIG_DEBUG_VM is on, or return MM with a bad page with wrong _count num. So let's just release this page. Signed-off-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/recovery.c')
| -rw-r--r-- | fs/f2fs/recovery.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c index 7dda1f28f6cb..d07546575879 100644 --- a/fs/f2fs/recovery.c +++ b/fs/f2fs/recovery.c @@ -145,7 +145,7 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head) err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC); if (err) - goto out; + return err; lock_page(page); @@ -191,9 +191,10 @@ next: /* check next segment */ blkaddr = next_blkaddr_of_node(page); } + unlock_page(page); -out: __free_pages(page, 0); + return err; } @@ -388,7 +389,7 @@ static int recover_data(struct f2fs_sb_info *sbi, err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC); if (err) - goto out; + return err; lock_page(page); @@ -412,8 +413,8 @@ next: /* check next segment */ blkaddr = next_blkaddr_of_node(page); } + unlock_page(page); -out: __free_pages(page, 0); if (!err) |