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Answer (Detailed Solution Below)

Option 4 : The default ordered journaling mode records metadata transactions but not the file data blocks themselves

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Detailed Solution

सही उत्तर The default ordered journaling mode records metadata transactions but not the file data blocks themselves है।

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Question:

After a system crash, an ext4 filesystem is examined but a recently written file's content cannot be reconstructed from the journal. The correct reason is / सिस्टम क्रैश के बाद ext4 फाइलसिस्टम की जाँच में हाल ही में लिखी फाइल की सामग्री जर्नल से पुनर्निर्मित नहीं हो पाई। सही कारण है

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The journal is encrypted with a key that is destroyed on every crash
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ext4 never journals anything and relies entirely on fsck for recovery
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The journal only stores filenames, so no file content can ever be recovered from it
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The default ordered journaling mode records metadata transactions but not the file data blocks themselves

Correct Answer: The default ordered journaling mode records metadata transactions but not the file data blocks themselves

ext4's default ordered mode journals metadata only, so uncommitted data blocks are lost on crash; only the data=journal mount mode journals file contents. / ext4 का डिफ़ॉल्ट ordered मोड सिर्फ मेटाडेटा जर्नल करता है, डेटा ब्लॉक नहीं; इसलिए क्रैश पर अस्वीकृत डेटा खो जाता है। Option (b) is the trap — ext4 does journal metadata, which is why directory structure survives crashes.

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