gfs2_log_reserve(9)

✨ gfs2_log_reserve(9) ✨

okay so welcome to this Kernel API Manual page, bestie — it's all about gfs2_log_reserve, and the vibe is literally “make a log reservation.” 💅

✨ NAME ✨

gfs2_log_reserve — Make a log reservation. periodt. 🎀

✨ SYNOPSIS ✨

void gfs2_log_reserve (struct gfs2_sbd *sdp , struct gfs2_trans *tr ,
       unsigned int *extra_revokes );

✨ ARGUMENTS ✨

• sdp — the GFS2 superblock. That's the main character struct here. 👑
• tr — the transaction. Yep, the transaction itself. 🌀
• extra_revokes — the number of additional revokes reserved (output). It's giving output parameter, so pay attention. 💖

✨ DESCRIPTION ✨

Okay so listen: sdp->sd_log_flush_lock must not be held. Not “maybe don't,” not “try not to” — it must not be held. That's the whole description, no cap. 🚫🔒

✨ SEE ALSO ✨

Kernel file: ./fs/gfs2/log.c

• gfs2_struct2blk(9)
• gfs2_remove_from_ail(9)
• gfs2_ail1_start_one(9)
• gfs2_ail1_flush(9)
• gfs2_ail1_start(9)
• gfs2_ail1_empty_one(9)
• gfs2_ail1_empty(9)
• gfs2_log_is_empty(9)
• gfs2_log_release_revokes(9)
• gfs2_log_release(9)
• __gfs2_log_try_reserve(9)
• __gfs2_log_reserve(9)
• gfs2_log_try_reserve(9)
• log_distance(9)
• calc_reserved(9)
• gfs2_flush_revokes(9)
• gfs2_write_log_header(9)
• log_write_header(9)
• gfs2_ail_drain(9)
• empty_ail1_list(9)
• gfs2_trans_drain(9)
• __gfs2_log_flush(9)
• gfs2_merge_trans(9)
• gfs2_log_commit(9)
• gfs2_log_shutdown(9)
• gfs2_logd(9)

xoxo, bestie 💜 — source/version: ./fs/gfs2; date: October 2026; page: gfs2_log_reserve(9).