linux-ext4 - Re: [PATCH v8 00/20] vfs: Add support for timestamp limits

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Date:   Tue, 20 Aug 2019 07:05:10 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Deepa Dinamani <deepa.kernel@...il.com>, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org
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Subject: Re: [PATCH v8 00/20] vfs: Add support for timestamp limits

On Sun, 2019-08-18 at 09:57 -0700, Deepa Dinamani wrote:
> The series is an update and a more complete version of the
> previously posted series at
> https://lore.kernel.org/linux-fsdevel/20180122020426.2988-1-deepa.kernel@gmail.com/
> 
> Thanks to Arnd Bergmann for doing a few preliminary reviews.
> They helped me fix a few issues I had overlooked.
> 
> The limits (sometimes granularity also) for the filesystems updated here are according to the
> following table:
> 
> File system   Time type                      Start year Expiration year Granularity
> cramfs        fixed                          0          0
> romfs         fixed                          0          0
> pstore        ascii seconds (27 digit ascii) S64_MIN    S64_MAX         1
> coda          INT64                          S64_MIN    S64_MAX         1
> omfs          64-bit milliseconds            0          U64_MAX/ 1000   NSEC_PER_MSEC
> befs          unsigned 48-bit seconds        0          0xffffffffffff  alloc_super
> bfs           unsigned 32-bit seconds        0          U32_MAX         alloc_super
> efs           unsigned 32-bit seconds        0          U32_MAX         alloc_super
> ext2          signed 32-bit seconds          S32_MIN    S32_MAX         alloc_super
> ext3          signed 32-bit seconds          S32_MIN    S32_MAX         alloc_super
> ext4 (old)    signed 32-bit seconds          S32_MIN    S32_MAX         alloc_super
> ext4 (extra)  34-bit seconds, 30-bit ns      S32_MIN    0x37fffffff	1
> freevxfs      u32 secs/usecs                 0          U32_MAX         alloc_super
> jffs2         unsigned 32-bit seconds        0          U32_MAX         alloc_super
> jfs           unsigned 32-bit seconds/ns     0          U32_MAX         1
> minix         unsigned 32-bit seconds        0          U32_MAX         alloc_super
> orangefs      u64 seconds                    0          U64_MAX         alloc_super
> qnx4          unsigned 32-bit seconds        0          U32_MAX         alloc_super
> qnx6          unsigned 32-bit seconds        0          U32_MAX         alloc_super
> reiserfs      unsigned 32-bit seconds        0          U32_MAX         alloc_super
> squashfs      unsigned 32-bit seconds        0          U32_MAX         alloc_super
> ufs1          signed 32-bit seconds          S32_MIN    S32_MAX         NSEC_PER_SEC
> ufs2          signed 64-bit seconds/u32 ns   S64_MIN    S64_MAX         1
> xfs           signed 32-bit seconds/ns       S32_MIN    S32_MAX         1
> ceph          unsigned 32-bit second/ns      0          U32_MAX         1000

Looks reasonable, overall.

Note that the granularity changed recently for cephfs. See commit
0f7cf80ae96c2a (ceph: initialize superblock s_time_gran to 1).

In any case, you can add my Acked-by

-- 
Jeff Layton <jlayton@...nel.org>