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* Compatibility with overlayfs
@ 2019-11-29 20:22 David Michael
  2019-11-30  1:29 ` Gao Xiang via Linux-erofs
  0 siblings, 1 reply; 5+ messages in thread
From: David Michael @ 2019-11-29 20:22 UTC (permalink / raw)
  To: linux-erofs

Hi,

I tried to test EROFS on Linux 5.4 as the root file system and mounted
a writable overlay (with upper layer on tmpfs) over /etc, but I get
ENODATA errors when attempting to modify files.  For example, adding a
user results in "Failed to take /etc/passwd lock: No data available".
Files can be modified after unlinking and restoring them so they're
created on the upper layer.  This is not necessary with other
read-only file systems (at least squashfs or ext4 with the read-only
feature).  I tried while forcing compact and extended inodes.

Is EROFS intended to be usable as a lower layer with overlayfs?

Thanks.

David

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2019-11-29 20:22 Compatibility with overlayfs David Michael
2019-11-30  1:29 ` Gao Xiang via Linux-erofs
2019-11-30  2:13   ` Gao Xiang via Linux-erofs
2019-11-30 15:15     ` David Michael
2019-11-30 16:27       ` Gao Xiang via Linux-erofs

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