jbd2_journa..._sb_log_tail(9)

💖 NAME 💖

okay so bestie, welcome to the jbd2_journa..._sb_log_tail(9) page from the Kernel API Manual 💖 this function, jbd2_journal_update_sb_log_tail, updates the log tail in the journal sb on disk — iconic behavior only ✨

✨ SYNOPSIS ✨

int jbd2_journal_update_sb_log_tail (journal_t *journal , tid_t tail_tid
, unsigned long tail_block , blk_opf_t write_flags );

🎀 ARGUMENTS 🎀

• journal — the journal you're updating, bestie 💅 literally the journal to update
• tail_tid — the TID of the new transaction at the tail of the log 🦋 tail transaction TID, iykyk
• tail_block — the first block of the transaction at the tail of the log 🎀 first block, no cap
• write_flags — the flags for the journal sb write operation ✨ all the write-operation flags

🦋 DESCRIPTION 🦋

so this one updates a journal's superblock information about the log tail, writes it to disk, and waits for the IO to complete 😭 like it genuinely waits for the IO to finish — that's the whole vibe. update + write + wait, periodt 💅

🌸 SEE ALSO 🌸

the kernel file in question is ./fs/jbd2/journal.c, and here's the related-entries squad 🫶:

• jbd2_journal_force_commit_nested(9)
• jbd2_journal_force_commit(9)
• jbd2_journal_shrink_scan(9)
• jbd2_journal_shrink_count(9)
• jbd2_journal_init_dev(9)
• jbd2_journal_init_inode(9)
• jbd2_mark_journal_empty(9)
• __jbd2_journal_erase(9)
• jbd2_journal_update_sb_errno(9)
• jbd2_journal_load(9)
• jbd2_journal_destroy(9)
• jbd2_journal_check_used_features(9)
• jbd2_journal_check_available_features(9)
• jbd2_journal_set_features(9)
• jbd2_journal_flush(9)
• jbd2_journal_wipe(9)
• jbd2_journal_abort(9)
• jbd2_journal_errno(9)
• jbd2_journal_clear_err(9)
• jbd2_journal_ack_err(9)

okay bye bestie 💖 source/version: ./fs/jbd2 · date: October 2026 · page: jbd2_journa..._sb_log_tail(9) 🎀