Catching these early makes them a lot easier to track down.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Convert these to standard error codes, which means we can pass them
outside the journal code, they're easier to pass to tracepoints, etc.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Incorrectly handled transaction restarts can be a source of heisenbugs;
add a mode where we randomly inject them to shake them out.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

If a block device (e.g. your typical consumer SSD) is taking multiple
seconds for IOs (typically flushes), we don't want to emit the "journal
stuck" message prematurely.

Also, make sure to drop the btree_trans srcu lock if we're blocking for
more than a second.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

New helper for dropping all write locks; which is distinct from the
helper the transaction commit path uses, which is faster and only
touches updates.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Avoiding screwing up path->lock_seq.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This breaks when the trigger is inserting updates for the same btree, as
the inode trigger now does.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This lets us print the exact location in the journal if it was found in
the journal, or correctly print if it was found in the superblock.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Add a new parameter to bkey validate functions, and use it to improve
invalid bkey error messages: we can now print the btree and depth it
came from, or if it came from the journal, or is a btree root.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>