#include <uchar.h>
#include <linux/ethtool.h>
#include <linux/fib_rules.h>
+#include <linux/stat.h>
+#include <sys/stat.h>
'''
# FIXME: key_serial_t is only defined in keyutils.h, this is bound to fail
'key_serial_t',
'struct ethtool_link_settings',
'struct fib_rule_uid_range',
+ 'struct statx',
]
# We get -1 if the size cannot be determined
['bpf', '''#include <sys/syscall.h>
#include <unistd.h>'''],
['explicit_bzero' , '''#include <string.h>'''],
+ ['statx', '''#include <sys/types.h>
+ #include <sys/stat.h>
+ #include <unistd.h>'''],
]
have = cc.has_function(ident[0], prefix : ident[1], args : '-D_GNU_SOURCE')
#include <linux/neighbour.h>
#include <linux/oom.h>
#include <linux/rtnetlink.h>
+#include <linux/stat.h>
#include <net/ethernet.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/socket.h>
+#include <sys/stat.h>
#include <sys/syscall.h>
#include <uchar.h>
#include <unistd.h>
#define PF_KTHREAD 0x00200000
#endif
+#if ! HAVE_STRUCT_STATX
+struct statx_timestamp {
+ int64_t tv_sec;
+ uint32_t tv_nsec;
+ uint32_t __reserved;
+};
+struct statx {
+ uint32_t stx_mask;
+ uint32_t stx_blksize;
+ uint64_t stx_attributes;
+ uint32_t stx_nlink;
+ uint32_t stx_uid;
+ uint32_t stx_gid;
+ uint16_t stx_mode;
+ uint16_t __spare0[1];
+ uint64_t stx_ino;
+ uint64_t stx_size;
+ uint64_t stx_blocks;
+ uint64_t stx_attributes_mask;
+ struct statx_timestamp stx_atime;
+ struct statx_timestamp stx_btime;
+ struct statx_timestamp stx_ctime;
+ struct statx_timestamp stx_mtime;
+ uint32_t stx_rdev_major;
+ uint32_t stx_rdev_minor;
+ uint32_t stx_dev_major;
+ uint32_t stx_dev_minor;
+ uint64_t __spare2[14];
+};
+#endif
+
+#ifndef STATX_BTIME
+#define STATX_BTIME 0x00000800U
+#endif
+
+#ifndef AT_STATX_DONT_SYNC
+#define AT_STATX_DONT_SYNC 0x4000
+#endif
+
#include "missing_syscall.h"
# endif
# endif
#endif
+
+#if !HAVE_STATX
+# ifndef __NR_statx
+# if defined __i386__
+# define __NR_bpf 383
+# elif defined __x86_64__
+# define __NR_bpf 332
+# else
+# warning "__NR_statx not defined for your architecture"
+# endif
+# endif
+
+struct statx;
+
+static inline ssize_t statx(int dfd, const char *filename, unsigned flags, unsigned int mask, struct statx *buffer) {
+# ifdef __NR_statx
+ return syscall(__NR_statx, dfd, filename, flags, mask, buffer);
+# else
+ errno = ENOSYS;
+ return -1;
+# endif
+}
+#endif
#include <errno.h>
#include <fcntl.h>
+#include <linux/stat.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "macro.h"
+#include "missing.h"
#include "sparse-endian.h"
#include "stdio-util.h"
#include "string-util.h"
return 0;
}
-int fd_getcrtime(int fd, usec_t *usec) {
+int fd_getcrtime_at(int dirfd, const char *name, usec_t *ret, int flags) {
+ struct statx sx;
+ usec_t a, b;
le64_t le;
ssize_t n;
+ int r;
- assert(fd >= 0);
- assert(usec);
-
- /* Until Linux gets a real concept of birthtime/creation time,
- * let's fake one with xattrs */
-
- n = fgetxattr(fd, "user.crtime_usec", &le, sizeof(le));
- if (n < 0)
- return -errno;
- if (n != sizeof(le))
- return -EIO;
+ assert(ret);
- return parse_crtime(le, usec);
-}
+ if (flags & ~(AT_EMPTY_PATH|AT_SYMLINK_NOFOLLOW))
+ return -EINVAL;
-int fd_getcrtime_at(int dirfd, const char *name, usec_t *usec, int flags) {
- le64_t le;
- ssize_t n;
+ /* So here's the deal: the creation/birth time (crtime/btime) of a file is a relatively newly supported concept
+ * on Linux (or more strictly speaking: a concept that only recently got supported in the API, it was
+ * implemented on various file systems on the lower level since a while, but never was accessible). However, we
+ * needed a concept like that for vaccuuming algorithms and such, hence we emulated it via a user xattr for a
+ * long time. Starting with Linux 4.11 there's statx() which exposes the timestamp to userspace for the first
+ * time, where it is available. Thius function will read it, but it tries to keep some compatibility with older
+ * systems: we try to read both the crtime/btime and the xattr, and then use whatever is older. After all the
+ * concept is useful for determining how "old" a file really is, and hence using the older of the two makes
+ * most sense. */
+
+ if (statx(dirfd, strempty(name), flags|AT_STATX_DONT_SYNC, STATX_BTIME, &sx) >= 0 &&
+ (sx.stx_mask & STATX_BTIME) &&
+ sx.stx_btime.tv_sec != 0)
+ a = (usec_t) sx.stx_btime.tv_sec * USEC_PER_SEC +
+ (usec_t) sx.stx_btime.tv_nsec / NSEC_PER_USEC;
+ else
+ a = USEC_INFINITY;
n = fgetxattrat_fake(dirfd, name, "user.crtime_usec", &le, sizeof(le), flags);
if (n < 0)
- return -errno;
- if (n != sizeof(le))
- return -EIO;
+ r = -errno;
+ else if (n != sizeof(le))
+ r = -EIO;
+ else
+ r = parse_crtime(le, &b);
+ if (r < 0) {
+ if (a != USEC_INFINITY) {
+ *ret = a;
+ return 0;
+ }
- return parse_crtime(le, usec);
-}
+ return r;
+ }
-int path_getcrtime(const char *p, usec_t *usec) {
- le64_t le;
- ssize_t n;
+ if (a != USEC_INFINITY)
+ *ret = MIN(a, b);
+ else
+ *ret = b;
- assert(p);
- assert(usec);
+ return 0;
+}
- n = getxattr(p, "user.crtime_usec", &le, sizeof(le));
- if (n < 0)
- return -errno;
- if (n != sizeof(le))
- return -EIO;
+int fd_getcrtime(int fd, usec_t *ret) {
+ return fd_getcrtime_at(fd, NULL, ret, AT_EMPTY_PATH);
+}
- return parse_crtime(le, usec);
+int path_getcrtime(const char *p, usec_t *ret) {
+ return fd_getcrtime_at(AT_FDCWD, p, ret, 0);
}
int fd_setcrtime(int fd, usec_t usec) {
assert(fd >= 0);
- if (usec <= 0)
+ if (IN_SET(usec, 0, USEC_INFINITY))
usec = now(CLOCK_REALTIME);
le = htole64((uint64_t) usec);
(void) journal_file_warn_btrfs(f);
- /* Let's attach the creation time to the journal file,
- * so that the vacuuming code knows the age of this
- * file even if the file might end up corrupted one
- * day... Ideally we'd just use the creation time many
- * file systems maintain for each file, but there is
- * currently no usable API to query this, hence let's
- * emulate this via extended attributes. If extended
- * attributes are not supported we'll just skip this,
- * and rely solely on mtime/atime/ctime of the file. */
-
- fd_setcrtime(f->fd, 0);
+ /* Let's attach the creation time to the journal file, so that the vacuuming code knows the age of this
+ * file even if the file might end up corrupted one day... Ideally we'd just use the creation time many
+ * file systems maintain for each file, but the API to query this is very new, hence let's emulate this
+ * via extended attributes. If extended attributes are not supported we'll just skip this, and rely
+ * solely on mtime/atime/ctime of the file. */
+ (void) fd_setcrtime(f->fd, 0);
#if HAVE_GCRYPT
/* Try to load the FSPRG state, and if we can't, then
#include "alloc-util.h"
#include "fd-util.h"
+#include "fileio.h"
#include "fs-util.h"
#include "macro.h"
#include "string-util.h"
assert_se(rmdir(t) >= 0);
}
+static void test_getcrtime(void) {
+
+ _cleanup_close_ int fd = -1;
+ char ts[FORMAT_TIMESTAMP_MAX];
+ const char *vt;
+ usec_t usec, k;
+ int r;
+
+ assert_se(tmp_dir(&vt) >= 0);
+
+ fd = open_tmpfile_unlinkable(vt, O_RDWR);
+ assert_se(fd >= 0);
+
+ r = fd_getcrtime(fd, &usec);
+ if (r < 0)
+ log_debug_errno(r, "btime: %m");
+ else
+ log_debug("btime: %s", format_timestamp(ts, sizeof(ts), usec));
+
+ k = now(CLOCK_REALTIME);
+
+ r = fd_setcrtime(fd, 1519126446UL * USEC_PER_SEC);
+ if (!IN_SET(r, -EOPNOTSUPP, -ENOTTY)) {
+ assert_se(fd_getcrtime(fd, &usec) >= 0);
+ assert_se(k < 1519126446UL * USEC_PER_SEC ||
+ usec == 1519126446UL * USEC_PER_SEC);
+ }
+}
+
int main(void) {
+ log_set_max_level(LOG_DEBUG);
+ log_parse_environment();
+ log_open();
+
test_fgetxattrat_fake();
+ test_getcrtime();
return 0;
}
projects / platform / upstream / systemd.git / commitdiff