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bcachefs: Add persistent counters

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This adds a new superblock field for persisting counters
and adds a sysfs interface in counters/ exposing these counters.

The superblock field is ignored by older versions letting us avoid
an on disk version bump.

Each sysfs file outputs a counter that tracks since filesystem
creation and a counter for the current mount session.

Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Daniel Hill 2022-03-15 21:36:33 +13:00 • committed by Kent Overstreet
commit 104c69745f
11 changed files with 223 additions and 9 deletions
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