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Fri, 14 Feb 2020 16:02:13 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A94E2187F; Fri, 14 Feb 2020 16:02:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696126; bh=TIlAmDaKuKNXe97gekocfkoxJrftjK9We8gokKkrcl0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r2epvvdTOxggURQqL6h4d3pBgBNfVbrTixNZf7RBnRvA5vsB30QrdaUoJmSvfF3os NnQOEx+t1ASvQibgQ0jSjMw7Rp4RuRzlBD8V+5jlMWAiBlmYtiHjdnfCRrI2lTMISN kR8SF5z7CC3Hwfrz0PVQavJWcOIaq3cUkFsJ22sA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Fri, 14 Feb 2020 10:54:22 -0500 Message-Id: <20200214160149.11681-12-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214160149.11681-1-sashal@kernel.org> References: <20200214160149.11681-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-Headers-End: 1j2dPv-00Ce0r-Pz Subject: [f2fs-dev] [PATCH AUTOSEL 5.4 012/459] f2fs: call f2fs_balance_fs outside of locked page X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Jaegeuk Kim , linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Jaegeuk Kim [ Upstream commit bdf03299248916640a835a05d32841bb3d31912d ] Otherwise, we can hit deadlock by waiting for the locked page in move_data_block in GC. Thread A Thread B - do_page_mkwrite - f2fs_vm_page_mkwrite - lock_page - f2fs_balance_fs - mutex_lock(gc_mutex) - f2fs_gc - do_garbage_collect - ra_data_block - grab_cache_page - f2fs_balance_fs - mutex_lock(gc_mutex) Fixes: 39a8695824510 ("f2fs: refactor ->page_mkwrite() flow") Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/file.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 44bc5f4a9ce19..c3a9da79ac997 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -50,7 +50,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) struct page *page = vmf->page; struct inode *inode = file_inode(vmf->vma->vm_file); struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - struct dnode_of_data dn = { .node_changed = false }; + struct dnode_of_data dn; int err; if (unlikely(f2fs_cp_error(sbi))) { @@ -63,6 +63,9 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) goto err; } + /* should do out of any locked page */ + f2fs_balance_fs(sbi, true); + sb_start_pagefault(inode->i_sb); f2fs_bug_on(sbi, f2fs_has_inline_data(inode)); @@ -120,8 +123,6 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) out_sem: up_read(&F2FS_I(inode)->i_mmap_sem); - f2fs_balance_fs(sbi, dn.node_changed); - sb_end_pagefault(inode->i_sb); err: return block_page_mkwrite_return(err); -- 2.20.1 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel