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Shortcut store files before lstat

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readdir() already returns the inode numbers, so we don't need to call
lstat to know if a file was already linked or not.
This commit is contained in:
Wout Mertens 2014-05-15 09:02:22 +02:00
parent d73ffc552f
commit 3b9ea8452f
2 changed files with 37 additions and 9 deletions
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1
src/libstore/local-store.hh
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@ -315,6 +315,7 @@ private:
#endif
InodeHash loadInodeHash();
Strings readDirectoryIgnoringInodes(const Path & path, const InodeHash & inodeHash, OptimiseStats & stats);
void optimisePath_(OptimiseStats & stats, const Path & path, InodeHash & inodeHash);
// Internal versions that are not wrapped in retry_sqlite.

45
src/libstore/optimise-store.cc
View file

@ -42,7 +42,7 @@ struct MakeReadOnly
LocalStore::InodeHash LocalStore::loadInodeHash()
{
printMsg(lvlDebug, "loading hash inodes in memory");
InodeHash hashes;
InodeHash inodeHash;
AutoCloseDir dir = opendir(linksDir.c_str());
if (!dir) throw SysError(format("opening directory `%1%'") % linksDir);
@ -51,16 +51,42 @@ LocalStore::InodeHash LocalStore::loadInodeHash()
while (errno = 0, dirent = readdir(dir)) { /* sic */
checkInterrupt();
// We don't care if we hit non-hash files, anything goes
hashes.insert(dirent->d_ino);
inodeHash.insert(dirent->d_ino);
}
if (errno) throw SysError(format("reading directory `%1%'") % linksDir);
printMsg(lvlInfo, format("loaded %1% hash inodes") % hashes.size());
printMsg(lvlInfo, format("loaded %1% hash inodes") % inodeHash.size());
return hashes;
return inodeHash;
}
void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHash & hashes)
Strings LocalStore::readDirectoryIgnoringInodes(const Path & path, const InodeHash & inodeHash, OptimiseStats & stats)
{
Strings names;
AutoCloseDir dir = opendir(path.c_str());
if (!dir) throw SysError(format("opening directory `%1%'") % path);
struct dirent * dirent;
while (errno = 0, dirent = readdir(dir)) { /* sic */
checkInterrupt();
if (inodeHash.count(dirent->d_ino)) {
printMsg(lvlDebug, format("`%1%' is already linked") % dirent->d_name);
stats.totalFiles++;
continue;
}
string name = dirent->d_name;
if (name == "." || name == "..") continue;
names.push_back(name);
}
if (errno) throw SysError(format("reading directory `%1%'") % path);
return names;
}
void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHash & inodeHash)
{
checkInterrupt();
@ -69,9 +95,9 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
throw SysError(format("getting attributes of path `%1%'") % path);
if (S_ISDIR(st.st_mode)) {
Strings names = readDirectory(path);
Strings names = readDirectoryIgnoringInodes(path, inodeHash, stats);
foreach (Strings::iterator, i, names)
optimisePath_(stats, path + "/" + *i, hashes);
optimisePath_(stats, path + "/" + *i, inodeHash);
return;
}
@ -93,7 +119,8 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
stats.totalFiles++;
if (st.st_nlink > 1 && hashes.count(st.st_ino)) {
/* This can still happen on top-level files */
if (st.st_nlink > 1 && inodeHash.count(st.st_ino)) {
printMsg(lvlDebug, format("`%1%' is already linked, with %2% other file(s).") % path % (st.st_nlink - 2));
return;
}
@ -116,7 +143,7 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
if (!pathExists(linkPath)) {
/* Nope, create a hard link in the links directory. */
if (link(path.c_str(), linkPath.c_str()) == 0) {
hashes.insert(st.st_ino);
inodeHash.insert(st.st_ino);
return;
}
if (errno != EEXIST)