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authorLudovic Courtès <ludo@gnu.org>2020-01-11 18:46:23 +0100
committerLudovic Courtès <ludo@gnu.org>2020-01-12 00:19:09 +0100
commit7033c7692ccbbbad8f7b9952015de071a5588e87 (patch)
treeb9745bafa5fc88819f55224aa06a048d760ca063
parent79154f0a09ad748839f88120ddd61a0e1e147b5e (diff)
downloadguix-7033c7692ccbbbad8f7b9952015de071a5588e87.tar.gz
guix-7033c7692ccbbbad8f7b9952015de071a5588e87.zip
daemon: Account for deleted store files when deduplication is on.
Previously, a store item that is a regular file would not be accounted for in the 'bytesFreed' value computed by 'deletePath' because its 'st_nlink' count would always be >= 2. This commit fixes that. * nix/libutil/util.hh (deletePath): Add optional 'linkThreshold' argument. * nix/libutil/util.cc (_deletePath): Add 'linkThreshold' argument and honor it. Pass it down in recursive call. (deletePath): Add 'linkThreshold' and honor it. * nix/libstore/gc.cc (LocalStore::deleteGarbage): Pass 'linkThreshold' argument to 'deletePath', with a value of 2 when PATH is a store item and deduplication is on.
-rw-r--r--nix/libstore/gc.cc9
-rw-r--r--nix/libutil/util.cc10
-rw-r--r--nix/libutil/util.hh6
3 files changed, 17 insertions, 8 deletions
diff --git a/nix/libstore/gc.cc b/nix/libstore/gc.cc
index 29b75aa875..5043963fa2 100644
--- a/nix/libstore/gc.cc
+++ b/nix/libstore/gc.cc
@@ -392,7 +392,14 @@ bool LocalStore::isActiveTempFile(const GCState & state,
void LocalStore::deleteGarbage(GCState & state, const Path & path)
{
unsigned long long bytesFreed;
- deletePath(path, bytesFreed);
+
+ /* When deduplication is on, store items always have at least two links:
+ the one at PATH, and one in /gnu/store/.links. In that case, increase
+ bytesFreed when PATH has two or fewer links. */
+ size_t linkThreshold =
+ (settings.autoOptimiseStore && isStorePath(path)) ? 2 : 1;
+
+ deletePath(path, bytesFreed, linkThreshold);
state.results.bytesFreed += bytesFreed;
}
diff --git a/nix/libutil/util.cc b/nix/libutil/util.cc
index faba3789df..fb2dfad1f7 100644
--- a/nix/libutil/util.cc
+++ b/nix/libutil/util.cc
@@ -305,7 +305,7 @@ void writeLine(int fd, string s)
}
-static void _deletePath(const Path & path, unsigned long long & bytesFreed)
+static void _deletePath(const Path & path, unsigned long long & bytesFreed, size_t linkThreshold)
{
checkInterrupt();
@@ -324,7 +324,7 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
struct stat st = lstat(path);
#endif
- if (!S_ISDIR(st.st_mode) && st.st_nlink == 1)
+ if (!S_ISDIR(st.st_mode) && st.st_nlink <= linkThreshold)
bytesFreed += st.st_size;
if (S_ISDIR(st.st_mode)) {
@@ -335,7 +335,7 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
}
for (auto & i : readDirectory(path))
- _deletePath(path + "/" + i.name, bytesFreed);
+ _deletePath(path + "/" + i.name, bytesFreed, linkThreshold);
}
#undef st_mode
#undef st_size
@@ -353,12 +353,12 @@ void deletePath(const Path & path)
}
-void deletePath(const Path & path, unsigned long long & bytesFreed)
+void deletePath(const Path & path, unsigned long long & bytesFreed, size_t linkThreshold)
{
startNest(nest, lvlDebug,
format("recursively deleting path `%1%'") % path);
bytesFreed = 0;
- _deletePath(path, bytesFreed);
+ _deletePath(path, bytesFreed, linkThreshold);
}
diff --git a/nix/libutil/util.hh b/nix/libutil/util.hh
index 6a6e07c478..9e3c14bdd4 100644
--- a/nix/libutil/util.hh
+++ b/nix/libutil/util.hh
@@ -94,10 +94,12 @@ void writeLine(int fd, string s);
/* Delete a path; i.e., in the case of a directory, it is deleted
recursively. Don't use this at home, kids. The second variant
- returns the number of bytes and blocks freed. */
+ returns the number of bytes and blocks freed, and 'linkThreshold' denotes
+ the number of links under which a file is accounted for in 'bytesFreed'. */
void deletePath(const Path & path);
-void deletePath(const Path & path, unsigned long long & bytesFreed);
+void deletePath(const Path & path, unsigned long long & bytesFreed,
+ size_t linkThreshold = 1);
/* Create a temporary directory. */
Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",