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journald: also check journal file size to deduce if it is empty

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This commit is contained in:
Lennart Poettering 2014-11-03 23:10:21 +01:00
parent dbd2a83fbf
commit 332076b45b
1 changed files with 15 additions and 7 deletions
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22
src/journal/journal-vacuum.c
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@ -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;
return le64toh(n_entries) == 0;
/* 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;
}
int journal_directory_vacuum(