[f2fs-dev] [PATCH 2/3] 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 --- fs/f2fs/recovery.c |9 + 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c index 7dda1f28..d075465 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) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[f2fs-dev] [PATCH 2/3] 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...@samsung.com --- fs/f2fs/recovery.c |9 + 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c index 7dda1f28..d075465 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) -- 1.7.9.5 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
