mirror of
https://github.com/torvalds/linux
synced 2024-07-21 02:23:16 +00:00
fb3f57bb11
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>
38 lines
744 B
C
38 lines
744 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _BCACHEFS_REBALANCE_TYPES_H
|
|
#define _BCACHEFS_REBALANCE_TYPES_H
|
|
|
|
#include "bbpos_types.h"
|
|
#include "move_types.h"
|
|
|
|
#define BCH_REBALANCE_STATES() \
|
|
x(waiting) \
|
|
x(working) \
|
|
x(scanning)
|
|
|
|
enum bch_rebalance_states {
|
|
#define x(t) BCH_REBALANCE_##t,
|
|
BCH_REBALANCE_STATES()
|
|
#undef x
|
|
};
|
|
|
|
struct bch_fs_rebalance {
|
|
struct task_struct __rcu *thread;
|
|
struct bch_pd_controller pd;
|
|
|
|
enum bch_rebalance_states state;
|
|
u64 wait_iotime_start;
|
|
u64 wait_iotime_end;
|
|
u64 wait_wallclock_start;
|
|
|
|
struct bch_move_stats work_stats;
|
|
|
|
struct bbpos scan_start;
|
|
struct bbpos scan_end;
|
|
struct bch_move_stats scan_stats;
|
|
|
|
unsigned enabled:1;
|
|
};
|
|
|
|
#endif /* _BCACHEFS_REBALANCE_TYPES_H */
|