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daemon: Drop 'AT_STATX_DONT_SYNC' flag upon EINVAL.

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Fixes <https://bugs.gnu.org/39727>.
Reported by Paul Garlick <pgarlick@tourbillion-technology.com>.

* nix/libstore/gc.cc (LocalStore::removeUnusedLinks) [HAVE_STATX]: Add
'statx_flags' static variables.  Clear 'AT_STATX_DONT_SYNC' flag from
'statx_flags' when 'statx' returns EINVAL.
This commit is contained in:
Ludovic Courtès 2020-02-26 21:44:48 +01:00
parent e524b57740
commit 513c0a0f46
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1 changed files with 16 additions and 4 deletions
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18
nix/libstore/gc.cc
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@ -581,15 +581,27 @@ void LocalStore::removeUnusedLinks(const GCState & state)
#ifdef HAVE_STATX
# define st_size stx_size
# define st_nlink stx_nlink
static int statx_flags = AT_SYMLINK_NOFOLLOW | AT_STATX_DONT_SYNC;
struct statx st;
if (statx(AT_FDCWD, path.c_str(),
AT_SYMLINK_NOFOLLOW | AT_STATX_DONT_SYNC,
if (statx(AT_FDCWD, path.c_str(), statx_flags,
STATX_SIZE | STATX_NLINK, &st) == -1) {
if (errno == EINVAL) {
/* Old 3.10 kernels (CentOS 7) don't support
AT_STATX_DONT_SYNC, so try again without it. */
statx_flags &= ~AT_STATX_DONT_SYNC;
if (statx(AT_FDCWD, path.c_str(), statx_flags,
STATX_SIZE | STATX_NLINK, &st) == -1)
throw SysError(format("statting `%1%'") % path);
} else {
throw SysError(format("statting `%1%'") % path);
}
}
#else
struct stat st;
if (lstat(path.c_str(), &st) == -1)
#endif
throw SysError(format("statting `%1%'") % path);
#endif
if (st.st_nlink != 1) {
actualSize += st.st_size;