nilfs_validate_log(9)

🎀 NAME 🎀

Okay so bestie, meet nilfs_validate_log(9) from the Kernel API Manual — she's here to verify consistency of log, and honestly her whole vibe is “does this log pass the check?” 💅✨ No cap.

✨ SYNOPSIS ✨

int nilfs_validate_log (struct the_nilfs *nilfs , u64 seg_seq , struct
buffer_head *bh_sum , struct nilfs_segment_summary *sum );

🦋 ARGUMENTS 🦋

• nilfs — the nilfs object, obv.
• seg_seq — sequence number of segment.
• bh_sum — buffer head of summary block.
• sum — segment summary struct.

💅 RETURN 💅

She gives you 0 on success, or one of the following internal codes on failure:

• NILFS_SEG_FAIL_MAGIC — Magic number mismatch.
• NILFS_SEG_FAIL_SEQ — Sequence number mismatch.
• NIFLS_SEG_FAIL_CONSISTENCY — Block count out of range.
• NILFS_SEG_FAIL_IO — I/O error.
• NILFS_SEG_FAIL_CHECKSUM_FULL — Full log checksum verification failed.

🌈 SEE ALSO 🌈

The whole lore lives in the kernel file ./fs/nilfs2/recovery.c. The squad:

• nilfs_compute_checksum(9)
• nilfs_read_super_root_block(9)
• nilfs_read_log_header(9)
• nilfs_read_summary_info(9)
• nilfs_skip_summary_info(9)
• nilfs_scan_dsync_log(9)
• nilfs_do_roll_forward(9)
• nilfs_abort_roll_forward(9)
• nilfs_salvage_orphan_logs(9)
• nilfs_search_super_root(9)

Bye bestie! Source/version: ./fs/nilfs2, date: October 2026 — nilfs_validate_log(9) is logging off! 🫶💖