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systemd/0007-journald-also-check-journal-file-size-to-deduce-if-i.patch

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From 332076b45b8a78f018ade2dfdc7e4279a56d49cc Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 3 Nov 2014 23:10:21 +0100
Subject: [PATCH] journald: also check journal file size to deduce if it is
empty
---
src/journal/journal-vacuum.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
diff --git src/journal/journal-vacuum.c src/journal/journal-vacuum.c
index dbf5d22..d141fe0 100644
--- src/journal/journal-vacuum.c
+++ src/journal/journal-vacuum.c
@@ -121,22 +121,30 @@ static void patch_realtime(
}
static int journal_file_empty(int dir_fd, const char *name) {
- int r;
- le64_t n_entries;
_cleanup_close_ int fd;
+ struct stat st;
+ le64_t n_entries;
+ ssize_t n;
fd = openat(dir_fd, name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
if (fd < 0)
return -errno;
- if (lseek(fd, offsetof(Header, n_entries), SEEK_SET) < 0)
+ if (fstat(fd, &st) < 0)
return -errno;
- r = read(fd, &n_entries, sizeof(n_entries));
- if (r != sizeof(n_entries))
- return r == 0 ? -EINVAL : -errno;
+ /* If an offline file doesn't even have a header we consider it empty */
+ if (st.st_size < (off_t) sizeof(Header))
+ return 1;
+
+ /* If the number of entries is empty, we consider it empty, too */
+ n = pread(fd, &n_entries, sizeof(n_entries), offsetof(Header, n_entries));
+ if (n < 0)
+ return -errno;
+ if (n != sizeof(n_entries))
+ return -EIO;
- return le64toh(n_entries) == 0;
+ return le64toh(n_entries) <= 0;
}
int journal_directory_vacuum(
--
1.7.9.2