Messages in this thread | | | Date | Sun, 1 Jul 2018 20:26:00 +0100 | From | Al Viro <> | Subject | Re: [PATCH 2/3] fs/ext2/inode: Fix a type cast error for fsdax |
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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?
> - iomap->offset = (u64)first_block << blkbits; > + iomap->offset = (loff_t)first_block << blkbits;
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