From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaegeuk Kim Subject: [PATCH 06/09] f2fs: avoid to allocate when inline_data was written Date: Sun, 19 Oct 2014 22:18:29 -0700 Message-ID: <1413782312-11631-6-git-send-email-jaegeuk@kernel.org> References: <1413782312-11631-1-git-send-email-jaegeuk@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Xg5Mm-0008PE-1G for linux-f2fs-devel@lists.sourceforge.net; Mon, 20 Oct 2014 05:18:48 +0000 Received: from mail.kernel.org ([198.145.19.201]) by sog-mx-4.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1Xg5Ml-0006gR-2a for linux-f2fs-devel@lists.sourceforge.net; Mon, 20 Oct 2014 05:18:47 +0000 In-Reply-To: <1413782312-11631-1-git-send-email-jaegeuk@kernel.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim The sceanrio is like this. inline_data i_size page write_begin/vm_page_mkwrite X 30 dirty_page X 30 write to #4096 position X 30 get_dnode_of_data wait for get_dnode_of_data O 30 write inline_data O 30 get_dnode_of_data O 30 reserve data block .. In this case, we have #0 = NEW_ADDR and inline_data as well. We should not allow this condition for further access. Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 32 +++++++++++++++++++++++--------- fs/f2fs/file.c | 26 ++++++++++++++++++++++---- 2 files changed, 45 insertions(+), 13 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 5b80ada..973fd77 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -257,9 +257,6 @@ int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) bool need_put = dn->inode_page ? false : true; int err; - /* if inode_page exists, index should be zero */ - f2fs_bug_on(F2FS_I_SB(dn->inode), !need_put && index); - err = get_dnode_of_data(dn, index, ALLOC_NODE); if (err) return err; @@ -951,7 +948,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, { struct inode *inode = mapping->host; struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - struct page *page; + struct page *page, *ipage; pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; struct dnode_of_data dn; int err = 0; @@ -979,13 +976,26 @@ repeat: goto inline_data; f2fs_lock_op(sbi); - set_new_dnode(&dn, inode, NULL, NULL, 0); - err = f2fs_reserve_block(&dn, index); - f2fs_unlock_op(sbi); - if (err) { + + /* check inline_data */ + ipage = get_node_page(sbi, inode->i_ino); + if (IS_ERR(ipage)) + goto unlock_fail; + + if (f2fs_has_inline_data(inode)) { + f2fs_put_page(ipage, 1); + f2fs_unlock_op(sbi); f2fs_put_page(page, 0); - goto fail; + goto repeat; } + + set_new_dnode(&dn, inode, ipage, NULL, 0); + err = f2fs_reserve_block(&dn, index); + if (err) + goto unlock_fail; + f2fs_put_dnode(&dn); + f2fs_unlock_op(sbi); + inline_data: lock_page(page); if (unlikely(page->mapping != mapping)) { @@ -1038,6 +1048,10 @@ out: SetPageUptodate(page); clear_cold_data(page); return 0; + +unlock_fail: + f2fs_unlock_op(sbi); + f2fs_put_page(page, 0); fail: f2fs_write_failed(mapping, pos + len); return err; diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 543d8c6..456df07 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -35,12 +35,13 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, struct inode *inode = file_inode(vma->vm_file); struct f2fs_sb_info *sbi = F2FS_I_SB(inode); struct dnode_of_data dn; + struct page *ipage; int err; f2fs_balance_fs(sbi); sb_start_pagefault(inode->i_sb); - +retry: /* force to convert with normal data indices */ err = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, page); if (err) @@ -48,11 +49,28 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, /* block allocation */ f2fs_lock_op(sbi); - set_new_dnode(&dn, inode, NULL, NULL, 0); + + /* check inline_data */ + ipage = get_node_page(sbi, inode->i_ino); + if (IS_ERR(ipage)) { + f2fs_unlock_op(sbi); + goto out; + } + + if (f2fs_has_inline_data(inode)) { + f2fs_put_page(ipage, 1); + f2fs_unlock_op(sbi); + goto retry; + } + + set_new_dnode(&dn, inode, ipage, NULL, 0); err = f2fs_reserve_block(&dn, page->index); - f2fs_unlock_op(sbi); - if (err) + if (err) { + f2fs_unlock_op(sbi); goto out; + } + f2fs_put_dnode(&dn); + f2fs_unlock_op(sbi); file_update_time(vma->vm_file); lock_page(page); -- 2.1.1 ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho