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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> MIME-Version: 1.0 X-Stat-Signature: 7krcwgiyar9mhaidd7zewa1wu8yczazd X-Rspamd-Queue-Id: 1FE091C0004 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1714045104-215929 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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);