filesystem: support ext4 super block emergency_ro flag#3717
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Since Linux 6.15, the ext4 superblock exposes the 'emergency_ro' flag when 'errors=remount-ro' has been triggered. The 'ro' flag is no longer set on the super block in this case since Linux 6.12. reference: - torvalds/linux@6b76715d5e41f - torvalds/linux@d3476f3dad4ad This commit will allow reporting an ext4 filesystem as read-only, for Linux 6.15+. Hosts with a version between 6.12 and 6.15 or with a backport of the 6.12 fix will still report an 'emergency_ro' filesystem as read-write. This was tested manually with a 6.18.x Kernel using a 'flakey' device mapper overlay for fault injection. Signed-off-by: Jean-Tiare Le Bigot <jean-tiare.lebigot@exoscale.ch>
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@SuperQ, @discordianfish Could you have a look? Thanks! |
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Thanks for the kernel source references, it helps. |
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Since Linux 6.15, the ext4 superblock exposes the 'emergency_ro' flag when 'errors=remount-ro' has been triggered. The 'ro' flag is no longer set on the super block in this case since Linux 6.12.
reference:
This commit will allow reporting an ext4 filesystem as read-only, for Linux 6.15+. Hosts with a version between 6.12 and 6.15 or with a backport of the 6.12 fix will still report an 'emergency_ro' filesystem as read-write.
This was tested manually with a 6.18.x Kernel using a 'flakey' device mapper overlay for fault injection.