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Date: Fri, 15 Jul 2022 23:52:32 +0000 From: "Kiselev, Oleg" <okiselev@...zon.com> To: Jan Kara <jack@...e.cz> CC: "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, Theodore Ts'o <tytso@....edu> Subject: Re: [PATCH 1/2] ext4: reduce computation of overhead during resize > On Jul 15, 2022, at 2:27 AM, Jan Kara <jack@...e.cz> wrote: > > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe. > > > > On Thu 14-07-22 19:53:38, Kiselev, Oleg wrote: >>> >>>> + sbi->s_overhead += overhead; >>>> + es->s_overhead_clusters = cpu_to_le32((unsigned long) sbi->s_overhead); >>> ^^^ the typecast looks >>> bogus here... >> >> This cast is the reverse of le32_to_cpu() cast done in fs/ext4/super.c:__ext4_fill_super(): >> sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); >> And follows the logic of casting done in fs/ext4/ioctl.c:set_overhead() and fs/ext4/ioctl.c:ext4_update_overhead(). > > I didn't mean the cpu_to_le32() call but rather the (unsigned long) part. > That is pointless because sbi->s_overhead is already 'unsigned long' and > even if it was not, I have hard time seeing a reason why would casting to > unsigned long make any difference here. Got it. You are right. The indent of your comment got mangled by mail, so it looked like it was directed to cpu_to_ie32()! > > Honza > -- > Jan Kara <jack@...e.com> > SUSE Labs, CR
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