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Delete non-directory valid paths right away

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It's unlikely that rename() is faster than unlink() on a regular file
or symlink, so don't bother.
This commit is contained in:
Eelco Dolstra 2012-03-26 20:56:30 +02:00
parent 117670be57
commit 480dda0e42
1 changed files with 27 additions and 16 deletions
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43
src/libstore/gc.cc
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@ -433,8 +433,13 @@ void LocalStore::deleteGarbage(GCState & state, const Path & path)
bool LocalStore::tryToDelete(GCState & state, const Path & path)
{
checkInterrupt();
if (!pathExists(path)) return true;
struct stat st;
if (lstat(path.c_str(), &st)) {
if (errno == ENOENT) return true;
throw SysError(format("getting status of %1%") % path);
}
if (state.deleted.find(path) != state.deleted.end()) return true;
if (state.live.find(path) != state.live.end()) return false;
@ -514,21 +519,27 @@ bool LocalStore::tryToDelete(GCState & state, const Path & path)
/* The path is garbage, so delete it. */
if (shouldDelete(state.options.action)) {
/* If it's a valid path that's not a regular file or symlink,
invalidate it, rename it, and schedule it for deletion.
The renaming is to ensure that later (when we're not
holding the global GC lock) we can delete the path without
being afraid that the path has become alive again.
Otherwise delete it right away. */
if (isValidPath(path)) {
/* If it's a valid path, invalidate it, rename it, and
schedule it for deletion. The renaming is to ensure
that later (when we're not holding the global GC lock)
we can delete the path without being afraid that the
path has become alive again. */
printMsg(lvlInfo, format("invalidating `%1%'") % path);
// Estimate the amount freed using the narSize field.
state.bytesInvalidated += queryPathInfo(path).narSize;
invalidatePathChecked(path);
Path tmp = (format("%1%-gc-%2%") % path % getpid()).str();
makeMutable(path.c_str());
if (rename(path.c_str(), tmp.c_str()))
throw SysError(format("unable to rename `%1%' to `%2%'") % path % tmp);
state.invalidated.insert(tmp);
if (S_ISDIR(st.st_mode)) {
printMsg(lvlInfo, format("invalidating `%1%'") % path);
// Estimate the amount freed using the narSize field.
state.bytesInvalidated += queryPathInfo(path).narSize;
invalidatePathChecked(path);
makeMutable(path.c_str());
Path tmp = (format("%1%-gc-%2%") % path % getpid()).str();
if (rename(path.c_str(), tmp.c_str()))
throw SysError(format("unable to rename `%1%' to `%2%'") % path % tmp);
state.invalidated.insert(tmp);
} else {
invalidatePathChecked(path);
deleteGarbage(state, path);
}
} else
deleteGarbage(state, path);