Creating/expanding files hit unexpected ENOSPC on ext4 filesystem
Issue
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Creating/expanding files sometimes fails with unexpected ENOSPC on ext4 filesystem even though the disk space looks sufficient.
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This phenomenon occurs if and only if the free space of the filesystem is almost the same as the size which is expected to be occupied by creating/expanding files.
Environment
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Red Hat Enterprise Linux 5 and 6
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ext4 filesystems
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