Extents are cached even if warnings appear - then warnings are never shown again
- Dominant language
- Perl
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Description
Create an empty cache dir and do the initial run. Warnings appear:
```
% mkdir /tmp/new-cache
% sudo btrbk --override 'cache_dir=/tmp/new-cache' extents /media/ssd/btrbk/home-var/*
WARNING: Failed to open 805329 / 805335 files
WARNING: Failed to open 805325 / 805331 files
WARNING: Failed to open 807545 / 807551 files
WARNING: Failed to open 809582 / 809588 files
WARNING: Failed to open 809457 / 809463 files
WARNING: Failed to open 810760 / 810766 files
WARNING: Failed to open 2640077 / 2640085 files
WARNING: Failed to open 3300898 / 3300906 files
TOTAL EXCLUSIVE SUBVOL
333.72 GiB 332.47 GiB /media/ssd/btrbk/home-var/home-var.20250206T1903
350.71 GiB 76.31 GiB /media/ssd/btrbk/home-var/home-var.20250314T1600
277.82 GiB 271.52 MiB /media/ssd/btrbk/home-var/home-var.20250422T1351
277.85 GiB 2.54 MiB /media/ssd/btrbk/home-var/home-var.20250424T1045
277.85 GiB 3.39 MiB /media/ssd/btrbk/home-var/home-var.20250424T1113
277.85 GiB 33.18 MiB /media/ssd/btrbk/home-var/home-var.20250424T1833
277.85 GiB 2.89 MiB /media/ssd/btrbk/home-var/home-var.20250425T1203
277.85 GiB 3.91 MiB /media/ssd/btrbk/home-var/home-var.20250425T1503
Union (8 subvolumes): 687.37 GiB
```
Run again and warnings are hidden:
```
% isudo btrbk --override 'cache_dir=/tmp/new-cache' extents /media/ssd/btrbk/home-var/*
TOTAL EXCLUSIVE SUBVOL
333.72 GiB 332.47 GiB /media/ssd/btrbk/home-var/home-var.20250206T1903
350.71 GiB 76.31 GiB /media/ssd/btrbk/home-var/home-var.20250314T1600
277.82 GiB 271.52 MiB /media/ssd/btrbk/home-var/home-var.20250422T1351
277.85 GiB 2.54 MiB /media/ssd/btrbk/home-var/home-var.20250424T1045
277.85 GiB 3.39 MiB /media/ssd/btrbk/home-var/home-var.20250424T1113
277.85 GiB 33.18 MiB /media/ssd/btrbk/home-var/home-var.20250424T1833
277.85 GiB 2.89 MiB /media/ssd/btrbk/home-var/home-var.20250425T1203
277.85 GiB 3.91 MiB /media/ssd/btrbk/home-var/home-var.20250425T1503
Union (8 subvolumes): 687.37 GiB
```
Am I correct in assuming that the warnings mean that the cached values may be incorrect?
If so, it would be great to keep them visible, perhaps by storing the warning in the cache files.
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