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authorKent Overstreet <kent.overstreet@linux.dev>2023-10-20 20:33:14 +0300
committerKent Overstreet <kent.overstreet@linux.dev>2023-11-02 04:11:05 +0300
commitfb3f57bb1177ae4d5550bbb431f90ebf277329e8 (patch)
treee55c5b2899b5885cdd660914848eec727fcd6f13 /fs/bcachefs/sysfs.c
parent55c11a159d3ca4ca7f9d5c1275d0768474b12195 (diff)
downloadlinux-fb3f57bb1177ae4d5550bbb431f90ebf277329e8.tar.xz
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>
Diffstat (limited to 'fs/bcachefs/sysfs.c')
-rw-r--r--fs/bcachefs/sysfs.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/fs/bcachefs/sysfs.c b/fs/bcachefs/sysfs.c
index 3ac6634020d1..7975587cab9a 100644
--- a/fs/bcachefs/sysfs.c
+++ b/fs/bcachefs/sysfs.c
@@ -212,7 +212,7 @@ read_attribute(copy_gc_wait);
rw_attribute(rebalance_enabled);
sysfs_pd_controller_attribute(rebalance);
-read_attribute(rebalance_work);
+read_attribute(rebalance_status);
rw_attribute(promote_whole_extents);
read_attribute(new_stripes);
@@ -386,8 +386,8 @@ SHOW(bch2_fs)
if (attr == &sysfs_copy_gc_wait)
bch2_copygc_wait_to_text(out, c);
- if (attr == &sysfs_rebalance_work)
- bch2_rebalance_work_to_text(out, c);
+ if (attr == &sysfs_rebalance_status)
+ bch2_rebalance_status_to_text(out, c);
sysfs_print(promote_whole_extents, c->promote_whole_extents);
@@ -646,7 +646,7 @@ struct attribute *bch2_fs_internal_files[] = {
&sysfs_copy_gc_wait,
&sysfs_rebalance_enabled,
- &sysfs_rebalance_work,
+ &sysfs_rebalance_status,
sysfs_pd_controller_files(rebalance),
&sysfs_moving_ctxts,
@@ -707,10 +707,8 @@ STORE(bch2_fs_opts_dir)
bch2_opt_set_by_id(&c->opts, id, v);
if ((id == Opt_background_target ||
- id == Opt_background_compression) && v) {
- bch2_rebalance_add_work(c, S64_MAX);
- rebalance_wakeup(c);
- }
+ id == Opt_background_compression) && v)
+ bch2_set_rebalance_needs_scan(c, 0);
ret = size;
err: