From patchwork Thu Dec 15 14:07:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Hocko X-Patchwork-Id: 9486835 X-Mozilla-Keys: nonjunk Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on sandeen.net X-Spam-Level: X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-HP: BAYES_00=-1.9,RCVD_IN_DNSWL_HI=-5,RP_MATCHES_RCVD=-0.1, URIBL_BLOCKED=0.001 X-Original-To: sandeen@sandeen.net Delivered-To: sandeen@sandeen.net Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by sandeen.net (Postfix) with ESMTP id 9A81187 for ; Thu, 15 Dec 2016 08:10:47 -0600 (CST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932526AbcLOOJy (ORCPT ); Thu, 15 Dec 2016 09:09:54 -0500 Received: from mail-wm0-f68.google.com ([74.125.82.68]:35157 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755783AbcLOOHz (ORCPT ); Thu, 15 Dec 2016 09:07:55 -0500 Received: by mail-wm0-f68.google.com with SMTP id a20so6738394wme.2; Thu, 15 Dec 2016 06:07:53 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=djqx4gtfDgrIfv1qSz0Oj9EhOPCl3TpgcSA/RVQfISg=; b=rDeEhd+aKsR61UVPRlYsRSollDmDt6wVVK1hUCFaRCH7ceYDTd8QO+SiQirEsopMj7 Yreyfx+DGZT0VaIYd6qqucIpT0h52q6jS87A8roPZCob/JflwV+0JzdVRDSoQ0+MKUXZ WHOLzxy6Q+PRKqYq94DT5zIwdCQmQkzluxQzsurAi8VGwZkhUVCbh60NKBLTAmrXOrOp qbMT+U3nKyAId/ejm8niMrHRdcZTjDOsZJ9Sc7PuKb1/ixEyiNZyIHwKoCQZdudB9VHz iB8Mum1oIb0Z02g8ef8pWUme31YmNdTOlLPZ7WSeh06ZjpOI3x4iAIltT5HF6t9ZW1Mw MYSg== X-Gm-Message-State: AIkVDXJfzeoYMGBBD13U0wTsRSPimphh6icjOHuxWEt/cFmGEMwYWDACBycrVh/nzsXp/A== X-Received: by 10.28.146.203 with SMTP id u194mr1556427wmd.79.1481810872404; Thu, 15 Dec 2016 06:07:52 -0800 (PST) Received: from tiehlicka.suse.cz ([213.151.95.130]) by smtp.gmail.com with ESMTPSA id d8sm12646880wmi.21.2016.12.15.06.07.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Dec 2016 06:07:51 -0800 (PST) From: Michal Hocko To: , Cc: Andrew Morton , Dave Chinner , "Theodore Ts'o" , Chris Mason , David Sterba , Jan Kara , ceph-devel@vger.kernel.org, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, logfs@logfs.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-mtd@lists.infradead.org, reiserfs-devel@vger.kernel.org, linux-ntfs-dev@lists.sourceforge.net, linux-f2fs-devel@lists.sourceforge.net, linux-afs@lists.infradead.org, LKML , Michal Hocko Subject: [PATCH 3/9] xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS Date: Thu, 15 Dec 2016 15:07:09 +0100 Message-Id: <20161215140715.12732-4-mhocko@kernel.org> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20161215140715.12732-1-mhocko@kernel.org> References: <20161215140715.12732-1-mhocko@kernel.org> Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Michal Hocko xfs has defined PF_FSTRANS to declare a scope GFP_NOFS semantic quite some time ago. We would like to make this concept more generic and use it for other filesystems as well. Let's start by giving the flag a more genric name PF_MEMALLOC_NOFS which is in line with an exiting PF_MEMALLOC_NOIO already used for the same purpose for GFP_NOIO contexts. Replace all PF_FSTRANS usage from the xfs code in the first step before we introduce a full API for it as xfs uses the flag directly anyway. This patch doesn't introduce any functional change. Signed-off-by: Michal Hocko Reviewed-by: Brian Foster --- fs/xfs/kmem.c | 4 ++-- fs/xfs/kmem.h | 2 +- fs/xfs/libxfs/xfs_btree.c | 2 +- fs/xfs/xfs_aops.c | 6 +++--- fs/xfs/xfs_trans.c | 12 ++++++------ include/linux/sched.h | 2 ++ 6 files changed, 15 insertions(+), 13 deletions(-) diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c index 339c696bbc01..a76a05dae96b 100644 --- a/fs/xfs/kmem.c +++ b/fs/xfs/kmem.c @@ -80,13 +80,13 @@ kmem_zalloc_large(size_t size, xfs_km_flags_t flags) * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering * the filesystem here and potentially deadlocking. */ - if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) + if ((current->flags & PF_MEMALLOC_NOFS) || (flags & KM_NOFS)) noio_flag = memalloc_noio_save(); lflags = kmem_flags_convert(flags); ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); - if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) + if ((current->flags & PF_MEMALLOC_NOFS) || (flags & KM_NOFS)) memalloc_noio_restore(noio_flag); return ptr; diff --git a/fs/xfs/kmem.h b/fs/xfs/kmem.h index ea3984091d58..e40ddd12900b 100644 --- a/fs/xfs/kmem.h +++ b/fs/xfs/kmem.h @@ -51,7 +51,7 @@ kmem_flags_convert(xfs_km_flags_t flags) lflags = GFP_ATOMIC | __GFP_NOWARN; } else { lflags = GFP_KERNEL | __GFP_NOWARN; - if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) + if ((current->flags & PF_MEMALLOC_NOFS) || (flags & KM_NOFS)) lflags &= ~__GFP_FS; } diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index 21e6a6ab6b9a..a2672ba4dc33 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -2866,7 +2866,7 @@ xfs_btree_split_worker( struct xfs_btree_split_args *args = container_of(work, struct xfs_btree_split_args, work); unsigned long pflags; - unsigned long new_pflags = PF_FSTRANS; + unsigned long new_pflags = PF_MEMALLOC_NOFS; /* * we are in a transaction context here, but may also be doing work diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 0f56fcd3a5d5..61ca9f9c5a12 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -189,7 +189,7 @@ xfs_setfilesize_trans_alloc( * We hand off the transaction to the completion thread now, so * clear the flag here. */ - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); return 0; } @@ -252,7 +252,7 @@ xfs_setfilesize_ioend( * thus we need to mark ourselves as being in a transaction manually. * Similarly for freeze protection. */ - current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); __sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS); /* we abort the update if there was an IO error */ @@ -1015,7 +1015,7 @@ xfs_do_writepage( * Given that we do not allow direct reclaim to call us, we should * never be called while in a filesystem transaction. */ - if (WARN_ON_ONCE(current->flags & PF_FSTRANS)) + if (WARN_ON_ONCE(current->flags & PF_MEMALLOC_NOFS)) goto redirty; /* diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index 70f42ea86dfb..f5969c8274fc 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -134,7 +134,7 @@ xfs_trans_reserve( bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; /* Mark this thread as being in a transaction */ - current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); /* * Attempt to reserve the needed disk blocks by decrementing @@ -144,7 +144,7 @@ xfs_trans_reserve( if (blocks > 0) { error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd); if (error != 0) { - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); return -ENOSPC; } tp->t_blk_res += blocks; @@ -221,7 +221,7 @@ xfs_trans_reserve( tp->t_blk_res = 0; } - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); return error; } @@ -914,7 +914,7 @@ __xfs_trans_commit( xfs_log_commit_cil(mp, tp, &commit_lsn, regrant); - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); xfs_trans_free(tp); /* @@ -944,7 +944,7 @@ __xfs_trans_commit( if (commit_lsn == -1 && !error) error = -EIO; } - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); xfs_trans_free_items(tp, NULLCOMMITLSN, !!error); xfs_trans_free(tp); @@ -998,7 +998,7 @@ xfs_trans_cancel( xfs_log_done(mp, tp->t_ticket, NULL, false); /* mark this thread as no longer being in a transaction */ - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS); xfs_trans_free_items(tp, NULLCOMMITLSN, dirty); xfs_trans_free(tp); diff --git a/include/linux/sched.h b/include/linux/sched.h index 4d1905245c7a..baffd340ea82 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2320,6 +2320,8 @@ extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ +#define PF_MEMALLOC_NOFS PF_FSTRANS /* Transition to a more generic GFP_NOFS scope semantic */ + /* * Only the _current_ task can read/write to tsk->flags, but other * tasks can access tsk->flags in readonly mode for example