bcachefs: rebalance_work

This adds a new btree, rebalance_work, to eliminate scanning required
for finding extents that need work done on them in the background - i.e.
for the background_target and background_compression options.

rebalance_work is a bitset btree, where a KEY_TYPE_set corresponds to an
extent in the extents or reflink btree at the same pos.

A new extent field is added, bch_extent_rebalance, which indicates that
this extent has work that needs to be done in the background - and which
options to use. This allows per-inode options to be propagated to
indirect extents - at least in some circumstances. In this patch,
changing IO options on a file will not propagate the new options to
indirect extents pointed to by that file.

Updating (setting/clearing) the rebalance_work btree is done by the
extent trigger, which looks at the bch_extent_rebalance field.

Scanning is still requrired after changing IO path options - either just
for a given inode, or for the whole filesystem. We indicate that
scanning is required by adding a KEY_TYPE_cookie key to the
rebalance_work btree: the cookie counter is so that we can detect that
scanning is still required when an option has been flipped mid-way
through an existing scan.

Future possible work:
 - Propagate options to indirect extents when being changed
 - Add other IO path options - nr_replicas, ec, to rebalance_work so
   they can be applied in the background when they change
 - Add a counter, for bcachefs fs usage output, showing the pending
   amount of rebalance work: we'll probably want to do this after the
   disk space accounting rewrite (moving it to a new btree)

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

1 files changed, 13 insertions, 5 deletions

diff --git a/fs/bcachefs/compress.c b/fs/bcachefs/compress.c
index 0e3981f42526..a8b148ec2a2b 100644
--- a/fs/bcachefs/compress.c
+++ b/fs/bcachefs/compress.c
@@ -697,18 +697,26 @@ err:
 	return ret;
 }
 
-void bch2_opt_compression_to_text(struct printbuf *out,
-				  struct bch_fs *c,
-				  struct bch_sb *sb,
-				  u64 v)
+void bch2_compression_opt_to_text(struct printbuf *out, u64 v)
 {
 	struct bch_compression_opt opt = bch2_compression_decode(v);
 
-	prt_str(out, bch2_compression_opts[opt.type]);
+	if (opt.type < BCH_COMPRESSION_OPT_NR)
+		prt_str(out, bch2_compression_opts[opt.type]);
+	else
+		prt_printf(out, "(unknown compression opt %u)", opt.type);
 	if (opt.level)
 		prt_printf(out, ":%u", opt.level);
 }
 
+void bch2_opt_compression_to_text(struct printbuf *out,
+				  struct bch_fs *c,
+				  struct bch_sb *sb,
+				  u64 v)
+{
+	return bch2_compression_opt_to_text(out, v);
+}
+
 int bch2_opt_compression_validate(u64 v, struct printbuf *err)
 {
 	if (!bch2_compression_opt_valid(v)) {