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From febbc3baae65db64692e3ae2852630c5e324ab43 Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Tue, 20 Feb 2018 14:16:15 +0100
Subject: [PATCH] sd-journal: when picking up a new file, compare inode/device
info with previous open file by same name
Let's make sure we aren't confused if a journal file is replaced by a
different one (for example due to rotation) if we are in a q overflow:
let's compare the inode/device information, and if it changed replace
any open file object as needed.
Fixes: #8198
(cherry-picked from commit 32cb1983ad6f7084ff86e259ff079742a8139719)
[msekleta: this is very slimmed down version of the above commit because
a lot of code from is not applicable to RHEL-7 version]
Related: #1540538
---
src/journal/sd-journal.c | 35 +++++++++++++++++++++++++++++------
1 file changed, 29 insertions(+), 6 deletions(-)
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index e1cde6e1c2..004fe646d4 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1224,20 +1224,43 @@ static bool file_type_wanted(int flags, const char *filename) {
static int add_any_file(sd_journal *j, const char *path) {
JournalFile *f = NULL;
+ struct stat st;
int r, k;
assert(j);
assert(path);
- if (path) {
- f = ordered_hashmap_get(j->files, path);
- if (f) {
- /* Mark this file as seen in this generation. This is used to GC old files in
- * process_q_overflow() to detect journal files that are still and discern them from those who
- * are gone. */
+ if (stat(path, &st) < 0) {
+ r = log_debug_errno(errno, "Failed to stat file '%s': %m", path);
+ return -errno;
+ }
+ if (S_ISDIR(st.st_mode)) {
+ log_debug("Uh, file '%s' is a directory? Refusing.", path);
+ return -EISDIR;
+ }
+ if (!S_ISREG(st.st_mode)) {
+ log_debug("Uh, file '%s' is not a regular file? Refusing.", path);
+ return -EBADFD;
+ }
+
+ f = ordered_hashmap_get(j->files, path);
+ if (f) {
+
+ if (f->last_stat.st_dev == st.st_dev &&
+ f->last_stat.st_ino == st.st_ino) {
+
+ /* We already track this file, under the same path and with the same device/inode numbers, it's hence
+ * really the same. Mark this file as seen in this generation. This is used to GC old files in
+ * process_q_overflow() to detect journal files that are still and discern them from those who are
+ * gone. */
f->last_seen_generation = j->generation;
return 0;
}
+
+ /* So we tracked a file under this name, but it has a different inode/device. In that case, it got
+ * replaced (probably due to rotation?), let's drop it hence from our list. */
+ remove_file_real(j, f);
+ f = NULL;
}
if (ordered_hashmap_size(j->files) >= JOURNAL_FILES_MAX) {