From: Huaisheng Ye <yehs2007@zoho.com>
To: "\"Al Viro\"" <viro@ZenIV.linux.org.uk>
Cc: linux-nvdimm@lists.01.org, chengnt@lenovo.com,
linux-kernel@vger.kernel.org, willy@infradead.org, jack@suse.com,
linux-ext4@vger.kernel.org
Subject: Re: [PATCH 2/3] fs/ext2/inode: Fix a type cast error for fsdax
Date: Mon, 02 Jul 2018 14:23:42 +0800 [thread overview]
Message-ID: <16459a9432e.10c419704327.5268154349116077352@zoho.com> (raw)
In-Reply-To: <20180701192600.GT30522@ZenIV.linux.org.uk>
---- On Mon, 02 Jul 2018 03:26:00 +0800 Al Viro <viro@ZenIV.linux.org.uk> wrote ----
> On Sun, Jul 01, 2018 at 02:18:47PM +0800, Huaisheng Ye wrote:
> > From: Huaisheng Ye <yehs1@lenovo.com>
> >
> > The type of offset within struct iomap is loff_t, which represents
> > file offset of mapping.
> >
> > In ext2_iomap_begin, iomap->offset shall be given a type cast as
> > loff_t instead of u64.
>
> Why is it an error? loff_t is uniformly typedefed to long long.
> In which case the second variant is different from the first one
> *and* does not step into nasal demon territory?
Sorry for my inaccuracy.
The type of iomap->offset is loff_t, is it better to cast first_block
to loff_t, then do the left shift operation?
>
> > - iomap->offset = (u64)first_block << blkbits;
> > + iomap->offset = (loff_t)first_block << blkbits;
>
---
Cheers,
Huaisheng
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Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Huaisheng Ye <yehs2007@zoho.com>
To: "\"Al Viro\"" <viro@ZenIV.linux.org.uk>
Cc: <dan.j.williams@intel.com>, <dave.jiang@intel.com>,
<willy@infradead.org>, <ross.zwisler@linux.intel.com>,
<vishal.l.verma@intel.com>, <jack@suse.com>, <chengnt@lenovo.com>,
<linux-nvdimm@lists.01.org>, <linux-kernel@vger.kernel.org>,
<linux-ext4@vger.kernel.org>,
"\"Huaisheng Ye\"" <yehs1@lenovo.com>
Subject: Re: [PATCH 2/3] fs/ext2/inode: Fix a type cast error for fsdax
Date: Mon, 02 Jul 2018 14:23:42 +0800 [thread overview]
Message-ID: <16459a9432e.10c419704327.5268154349116077352@zoho.com> (raw)
In-Reply-To: <20180701192600.GT30522@ZenIV.linux.org.uk>
---- On Mon, 02 Jul 2018 03:26:00 +0800 Al Viro <viro@ZenIV.linux.org.uk> wrote ----
> On Sun, Jul 01, 2018 at 02:18:47PM +0800, Huaisheng Ye wrote:
> > From: Huaisheng Ye <yehs1@lenovo.com>
> >
> > The type of offset within struct iomap is loff_t, which represents
> > file offset of mapping.
> >
> > In ext2_iomap_begin, iomap->offset shall be given a type cast as
> > loff_t instead of u64.
>
> Why is it an error? loff_t is uniformly typedefed to long long.
> In which case the second variant is different from the first one
> *and* does not step into nasal demon territory?
Sorry for my inaccuracy.
The type of iomap->offset is loff_t, is it better to cast first_block
to loff_t, then do the left shift operation?
>
> > - iomap->offset = (u64)first_block << blkbits;
> > + iomap->offset = (loff_t)first_block << blkbits;
>
---
Cheers,
Huaisheng
WARNING: multiple messages have this Message-ID (diff)
From: Huaisheng Ye <yehs2007-ytc+IHgoah0@public.gmane.org>
To: "\"Al Viro\"" <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Cc: linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org,
chengnt-6jq1YtArVR3QT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
jack-IBi9RG/b67k@public.gmane.org,
linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/3] fs/ext2/inode: Fix a type cast error for fsdax
Date: Mon, 02 Jul 2018 14:23:42 +0800 [thread overview]
Message-ID: <16459a9432e.10c419704327.5268154349116077352@zoho.com> (raw)
In-Reply-To: <20180701192600.GT30522-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
---- On Mon, 02 Jul 2018 03:26:00 +0800 Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org> wrote ----
> On Sun, Jul 01, 2018 at 02:18:47PM +0800, Huaisheng Ye wrote:
> > From: Huaisheng Ye <yehs1-6jq1YtArVR3QT0dZR+AlfA@public.gmane.org>
> >
> > The type of offset within struct iomap is loff_t, which represents
> > file offset of mapping.
> >
> > In ext2_iomap_begin, iomap->offset shall be given a type cast as
> > loff_t instead of u64.
>
> Why is it an error? loff_t is uniformly typedefed to long long.
> In which case the second variant is different from the first one
> *and* does not step into nasal demon territory?
Sorry for my inaccuracy.
The type of iomap->offset is loff_t, is it better to cast first_block
to loff_t, then do the left shift operation?
>
> > - iomap->offset = (u64)first_block << blkbits;
> > + iomap->offset = (loff_t)first_block << blkbits;
>
---
Cheers,
Huaisheng
next prev parent reply other threads:[~2018-07-02 6:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-01 6:18 [PATCH 1/3] drivers/dax/super: Add annotation for ops in struct dax_device Huaisheng Ye
2018-07-01 6:18 ` Huaisheng Ye
2018-07-01 6:18 ` Huaisheng Ye
2018-07-01 6:18 ` [PATCH 2/3] fs/ext2/inode: Fix a type cast error for fsdax Huaisheng Ye
2018-07-01 6:18 ` Huaisheng Ye
2018-07-01 6:18 ` Huaisheng Ye
2018-07-01 19:26 ` Al Viro
2018-07-01 19:26 ` Al Viro
2018-07-01 19:26 ` Al Viro
2018-07-02 6:23 ` Huaisheng Ye [this message]
2018-07-02 6:23 ` Huaisheng Ye
2018-07-02 6:23 ` Huaisheng Ye
2018-07-02 7:55 ` Jan Kara
2018-07-02 7:55 ` Jan Kara
2018-07-02 7:55 ` Jan Kara
2018-07-01 6:18 ` [PATCH 3/3] fs/ext2/inode: Optimize the condition for iomap_begin Huaisheng Ye
2018-07-01 6:18 ` Huaisheng Ye
2018-07-01 6:18 ` Huaisheng Ye
2018-07-02 7:57 ` Jan Kara
2018-07-02 7:57 ` Jan Kara
2018-07-02 7:57 ` Jan Kara
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