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btrbk: try readlink only once per url 

Change semantics of %realpath_cache: if "" (empty string), do not try
to run readlink shell command again on same URL.
pull/334/head
Axel Burri 2019-12-15 17:33:26 +01:00
parent 8c11c2eb7d
commit 1f7773dddc
1 changed files with 4 additions and 3 deletions
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@ -274,7 +274,7 @@ my %raw_url_cache; # map URL to (fake) btr_tree node
my %mountinfo_cache; # map MACHINE_ID to mount points (sorted descending by file length)
my %mount_source_cache; # map URL_PREFIX:mount_source (aka device) to btr_tree node
my %uuid_cache; # map UUID to btr_tree node
my %realpath_cache; # map URL to realpath (symlink target)
my %realpath_cache; # map URL to realpath (symlink target). empty string denotes an error.
my $tree_inject_id = 0; # fake subvolume id for injected nodes (negative)
my $fake_uuid_prefix = 'XXXXXXXX-XXXX-XXXX-XXXX-'; # plus 0-padded inject_id: XXXXXXXX-XXXX-XXXX-XXXX-000000000000
@ -1929,9 +1929,10 @@ sub btrfs_mountpoint
# get real path
my $realpath = $realpath_cache{$vol->{URL}};
unless($realpath) {
unless(defined($realpath)) {
$realpath = system_realpath($vol);
$realpath_cache{$vol->{URL}} = $realpath;
# set to empty string on errors (try only once)
$realpath_cache{$vol->{URL}} = $realpath // "";
}
return undef unless($realpath);