From patchwork Thu Apr 25 11:37:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Pankaj Raghav (Samsung)" X-Patchwork-Id: 13643173 Received: from mout-p-202.mailbox.org (mout-p-202.mailbox.org [80.241.56.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 94B9E12AADE; Thu, 25 Apr 2024 11:38:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714045107; cv=none; b=bcaSDesvklgHDsJC65EkwYRHuuOaTIlqi/df/MjaQA6CBraEQxUYJuc5bJzc5VOHhts0kGcf93l1lGgjlpnuVHKkCxbjccCDN8cSw40weDz55SPeSicatvBhHwt5ks8d6O6RST/0oWSvZUg1hQasZ5I7J4DKQCELPkkyZ8oLHVI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714045107; c=relaxed/simple; bh=VVLw6+OrjyFkMWG8PExfstSK9BB9dV/iLihX1n6uTBI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nCd34e+Q3W/GMo0UX6m6T5EbciBLzK/3BrvBriV2RW2tH1WbUNJW1+aF6kPTFGJzxbpfMKAluy3CaGvjwutle5KlTLSVTatmjboCtRgmKXl6Uk88liwfgXkN65g+y9eHDaArWfdOiGkXwq9oGm68Ga6W984JjEEdWOP2r24YvKY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=pankajraghav.com; spf=pass smtp.mailfrom=pankajraghav.com; dkim=pass (2048-bit key) header.d=pankajraghav.com header.i=@pankajraghav.com header.b=g9o+YhGp; arc=none smtp.client-ip=80.241.56.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=pankajraghav.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pankajraghav.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=pankajraghav.com header.i=@pankajraghav.com header.b="g9o+YhGp" Received: from smtp102.mailbox.org (smtp102.mailbox.org [IPv6:2001:67c:2050:b231:465::102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-202.mailbox.org (Postfix) with ESMTPS id 4VQDPp0xnmz9sr0; Thu, 25 Apr 2024 13:38:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pankajraghav.com; s=MBO0001; t=1714045102; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Mzy+vEt0Ou46AF43fFmIy+ZUX/Zt6Oz29cAtMC3yZgg=; b=g9o+YhGpTLj38QjSXu/Tp0pXNF/qKronl8zsmBk9FkPmf9vVsVSiPEVWMfOvqnCEtNXw+f PSDAyEbeKSf+kyuVgLJ1j/NDoHynyYlnQpFGy6f0GhcljYB2b58Nk5wlujtpQ5FhNOMzZE Gx2hdcj8rhy2Z9hXo2ZF/0j8EWTN9h+B4R/r+RXFBh8mcU+7HnadjM7X9nJ/Kk+3j8MHFy Wje26dj5b12Z85igfcpE4A7+6r3I6BwuyHWuM3cYbshoDp5asV6WYXJhvnn84FX8Vt7ueA 8xEsR7x8o/j2Z5cVQ/OSsdMH9yYa1Tvn+Un7hHYyN9xUUfe86hKtVt3XH0FYIw== From: "Pankaj Raghav (Samsung)" To: willy@infradead.org, djwong@kernel.org, brauner@kernel.org, david@fromorbit.com, chandan.babu@oracle.com, akpm@linux-foundation.org Cc: linux-fsdevel@vger.kernel.org, hare@suse.de, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, mcgrof@kernel.org, gost.dev@samsung.com, p.raghav@samsung.com, Dave Chinner , Pankaj Raghav Subject: [PATCH v4 08/11] xfs: use kvmalloc for xattr buffers Date: Thu, 25 Apr 2024 13:37:43 +0200 Message-Id: <20240425113746.335530-9-kernel@pankajraghav.com> In-Reply-To: <20240425113746.335530-1-kernel@pankajraghav.com> References: <20240425113746.335530-1-kernel@pankajraghav.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Queue-Id: 4VQDPp0xnmz9sr0 From: Dave Chinner Pankaj Raghav reported that when filesystem block size is larger than page size, the xattr code can use kmalloc() for high order allocations. This triggers a useless warning in the allocator as it is a __GFP_NOFAIL allocation here: static inline struct page *rmqueue(struct zone *preferred_zone, struct zone *zone, unsigned int order, gfp_t gfp_flags, unsigned int alloc_flags, int migratetype) { struct page *page; /* * We most definitely don't want callers attempting to * allocate greater than order-1 page units with __GFP_NOFAIL. */ >>>> WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); ... Fix this by changing all these call sites to use kvmalloc(), which will strip the NOFAIL from the kmalloc attempt and if that fails will do a __GFP_NOFAIL vmalloc(). This is not an issue that productions systems will see as filesystems with block size > page size cannot be mounted by the kernel; Pankaj is developing this functionality right now. Reported-by: Pankaj Raghav Fixes: f078d4ea8276 ("xfs: convert kmem_alloc() to kmalloc()") Signed-off-by: Dave Chinner Reviewed-by: Darrick J. Wong --- fs/xfs/libxfs/xfs_attr_leaf.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c index ac904cc1a97b..969abc6efd70 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.c +++ b/fs/xfs/libxfs/xfs_attr_leaf.c @@ -1059,10 +1059,7 @@ xfs_attr3_leaf_to_shortform( trace_xfs_attr_leaf_to_sf(args); - tmpbuffer = kmalloc(args->geo->blksize, GFP_KERNEL | __GFP_NOFAIL); - if (!tmpbuffer) - return -ENOMEM; - + tmpbuffer = kvmalloc(args->geo->blksize, GFP_KERNEL | __GFP_NOFAIL); memcpy(tmpbuffer, bp->b_addr, args->geo->blksize); leaf = (xfs_attr_leafblock_t *)tmpbuffer; @@ -1125,7 +1122,7 @@ xfs_attr3_leaf_to_shortform( error = 0; out: - kfree(tmpbuffer); + kvfree(tmpbuffer); return error; } @@ -1533,7 +1530,7 @@ xfs_attr3_leaf_compact( trace_xfs_attr_leaf_compact(args); - tmpbuffer = kmalloc(args->geo->blksize, GFP_KERNEL | __GFP_NOFAIL); + tmpbuffer = kvmalloc(args->geo->blksize, GFP_KERNEL | __GFP_NOFAIL); memcpy(tmpbuffer, bp->b_addr, args->geo->blksize); memset(bp->b_addr, 0, args->geo->blksize); leaf_src = (xfs_attr_leafblock_t *)tmpbuffer; @@ -1571,7 +1568,7 @@ xfs_attr3_leaf_compact( */ xfs_trans_log_buf(trans, bp, 0, args->geo->blksize - 1); - kfree(tmpbuffer); + kvfree(tmpbuffer); } /* @@ -2250,7 +2247,7 @@ xfs_attr3_leaf_unbalance( struct xfs_attr_leafblock *tmp_leaf; struct xfs_attr3_icleaf_hdr tmphdr; - tmp_leaf = kzalloc(state->args->geo->blksize, + tmp_leaf = kvzalloc(state->args->geo->blksize, GFP_KERNEL | __GFP_NOFAIL); /* @@ -2291,7 +2288,7 @@ xfs_attr3_leaf_unbalance( } memcpy(save_leaf, tmp_leaf, state->args->geo->blksize); savehdr = tmphdr; /* struct copy */ - kfree(tmp_leaf); + kvfree(tmp_leaf); } xfs_attr3_leaf_hdr_to_disk(state->args->geo, save_leaf, &savehdr);