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Mon, 18 May 2020 18:36:05 +0000 Received: from gmail.com (unknown [104.132.1.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DE60020715; Mon, 18 May 2020 18:35:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589826944; bh=E6EpMAiuGo4p9ujOeELI+8en7tMtKUuc3RaFTgxNX3I=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=L5sfVHWoIiiRKy3p3+hKRs3J026wvJEQdqp6BLDswWji0eqfovcpJhIdXQWq3KlYt bjy0J9hqzbzhH/AucMy4au7HRWEC8t3M2y+aJZdtxdx/aYcnw8Agdpk5aoQUK6LJ5J uRjwQnZ2640Ms/3zB+PIu/Gg0n0G+XvM82dBgIcc= Date: Mon, 18 May 2020 11:35:42 -0700 From: Eric Biggers To: Jaegeuk Kim Message-ID: <20200518183542.GA121709@gmail.com> References: <20200505204823.211214-1-ebiggers@kernel.org> <20200518180648.GB218254@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200518180648.GB218254@google.com> X-Headers-End: 1jakcG-00EGZS-MH Subject: Re: [f2fs-dev] [PATCH] f2fs: don't return vmalloc() memory from f2fs_kmalloc() 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: 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 On Mon, May 18, 2020 at 11:06:48AM -0700, Jaegeuk Kim wrote: > On 05/05, Eric Biggers wrote: > > From: Eric Biggers > > > > kmalloc() returns kmalloc'ed memory, and kvmalloc() returns either > > kmalloc'ed or vmalloc'ed memory. But the f2fs wrappers, f2fs_kmalloc() > > and f2fs_kvmalloc(), both return both kinds of memory. > > > > It's redundant to have two functions that do the same thing, and also > > breaking the standard naming convention is causing bugs since people > > assume it's safe to kfree() memory allocated by f2fs_kmalloc(). See > > e.g. the various allocations in fs/f2fs/compress.c. > > > > Fix this by making f2fs_kmalloc() just use kmalloc(). And to avoid > > re-introducing the allocation failures that the vmalloc fallback was > > intended to fix, convert the largest allocations to use f2fs_kvmalloc(). > > > > Signed-off-by: Eric Biggers > > --- > > fs/f2fs/checkpoint.c | 4 ++-- > > fs/f2fs/f2fs.h | 8 +------- > > fs/f2fs/node.c | 8 ++++---- > > 3 files changed, 7 insertions(+), 13 deletions(-) > > > > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c > > index 97b6378554b406..ac5b47f15f5e77 100644 > > --- a/fs/f2fs/checkpoint.c > > +++ b/fs/f2fs/checkpoint.c > > @@ -895,8 +895,8 @@ int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi) > > int i; > > int err; > > > > - sbi->ckpt = f2fs_kzalloc(sbi, array_size(blk_size, cp_blks), > > - GFP_KERNEL); > > + sbi->ckpt = f2fs_kvzalloc(sbi, array_size(blk_size, cp_blks), > > + GFP_KERNEL); > > if (!sbi->ckpt) > > return -ENOMEM; > > /* > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > index d036a31a97e84e..bc4c5b9b1bf14c 100644 > > --- a/fs/f2fs/f2fs.h > > +++ b/fs/f2fs/f2fs.h > > @@ -2953,18 +2953,12 @@ static inline bool f2fs_may_extent_tree(struct inode *inode) > > static inline void *f2fs_kmalloc(struct f2fs_sb_info *sbi, > > size_t size, gfp_t flags) > > { > > - void *ret; > > - > > if (time_to_inject(sbi, FAULT_KMALLOC)) { > > f2fs_show_injection_info(sbi, FAULT_KMALLOC); > > return NULL; > > } > > > > - ret = kmalloc(size, flags); > > - if (ret) > > - return ret; > > - > > - return kvmalloc(size, flags); > > + return kmalloc(size, flags); > > IIRC, sometimes, we suffered from ENOMEM from kmalloc, as some structures > depended on the disk capacity. I can't remember exactly which structure tho. > I think this patch already addresses that, by changing the large allocations to use f2fs_kvmalloc(). - Eric _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel