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Support O_DIRECT option in FileCache (and possibly in MultiprocessFileCache) #214

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kuenishi opened this issue Sep 29, 2021 · 2 comments
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Support O_DIRECT option in FileCache (and possibly in MultiprocessFileCache) #214

kuenishi opened this issue Sep 29, 2021 · 2 comments
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cat:enhancement Implementation that does not break interfaces. wontfix This will not be worked on

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@kuenishi
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@kuenishi kuenishi added the cat:enhancement Implementation that does not break interfaces. label Sep 29, 2021
@kuenishi kuenishi added this to the 2.0.0 milestone Sep 29, 2021
@kuenishi kuenishi mentioned this issue Sep 29, 2021
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@kuenishi kuenishi added the wontfix This will not be worked on label Sep 29, 2021
@kuenishi kuenishi removed this from the 2.0.0 milestone Sep 29, 2021
@kuenishi
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From open(2),

   O_DIRECT
       The O_DIRECT flag may impose alignment restrictions on the length and address of user-space buffers and the file offset of I/Os.  In Linux alignment
       restrictions vary by filesystem and kernel version and might be absent entirely.  However there is currently no filesystem-independent interface for
       an application to discover these restrictions for a given file or filesystem.  Some filesystems provide their own interfaces for doing so, for exam‐
       ple the XFS_IOC_DIOINFO operation in xfsctl(3).

@kuenishi
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Discussion on OpenZFS is really interesting and worth referring from here. openzfs/zfs#224 (comment)

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