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d2f6e83bbb
Commit-time fast commit snapshots run under jbd2_journal_lock_updates(), so it is useful to quantify the time spent with updates locked and to understand why snapshotting can fail. Add a new tracepoint, ext4_fc_lock_updates, reporting the time spent in the updates-locked window along with the number of snapshotted inodes and ranges. Record the first snapshot failure reason in a stable snap_err field for tooling. Signed-off-by: Li Chen <chenl311@chinatelecom.cn> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://patch.msgid.link/20260515091829.194810-7-me@linux.beauty Signed-off-by: Theodore Ts'o <tytso@mit.edu>