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On Fri, Mar 29, 2013 at 8:48 AM, Florian Philipp <lists@×××××××××××.net> wrote: |
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> Hi list! |
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> |
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> I noticed that beginning with kernel 3.8, ext4 can store small files |
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> entirely inside the inode. But I couldn't find much additional information: |
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> |
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> - Is the improvement automatically enabled? |
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I don't believe so. I think you need to explicitly enable the feature |
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inline_data when you mkfs. |
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> - Is the change backwards compatible? Can I still read such files with |
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> kernel 3.7? |
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It is defined as INCOMPAT_INLINE_DATA so an older kernel should refuse |
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to mount it at all if it does not know how to handle this option. |
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Depending on your partition layout, you may also need a boot loader |
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which knows how to read inline data. I think there is a patch to |
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enable it on grub2, not sure if it is included in mainline or not. |
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> - Can current stable e2fsprogs (especially e2fsck) handle this? |
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I grepped sources of e2fsprogs 1.42.7 and it contains references to |
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inline data, but manpages don't. mkfs looks like it might not support |
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the inline_data option yet? So I'm not sure if things are quite ready |
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for "prime time"... If you try, please let us know how it goes. :) |
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