Merge pull request #695 from poettering/journal-fixes

Journal fixes

4 files changed, 152 insertions, 125 deletions

diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index be6a5522fa..f7815b2796 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -656,13 +656,16 @@ static int journal_file_setup_field_hash_table(JournalFile *f) {
         return 0;
 }
 
-static int journal_file_map_data_hash_table(JournalFile *f) {
+int journal_file_map_data_hash_table(JournalFile *f) {
         uint64_t s, p;
         void *t;
         int r;
 
         assert(f);
 
+        if (f->data_hash_table)
+                return 0;
+
         p = le64toh(f->header->data_hash_table_offset);
         s = le64toh(f->header->data_hash_table_size);
 
@@ -678,13 +681,16 @@ static int journal_file_map_data_hash_table(JournalFile *f) {
         return 0;
 }
 
-static int journal_file_map_field_hash_table(JournalFile *f) {
+int journal_file_map_field_hash_table(JournalFile *f) {
         uint64_t s, p;
         void *t;
         int r;
 
         assert(f);
 
+        if (f->field_hash_table)
+                return 0;
+
         p = le64toh(f->header->field_hash_table_offset);
         s = le64toh(f->header->field_hash_table_size);
 
@@ -803,10 +809,18 @@ int journal_file_find_field_object_with_hash(
         assert(f);
         assert(field && size > 0);
 
+        /* If the field hash table is empty, we can't find anything */
+        if (le64toh(f->header->field_hash_table_size) <= 0)
+                return 0;
+
+        /* Map the field hash table, if it isn't mapped yet. */
+        r = journal_file_map_field_hash_table(f);
+        if (r < 0)
+                return r;
+
         osize = offsetof(Object, field.payload) + size;
 
         m = le64toh(f->header->field_hash_table_size) / sizeof(HashItem);
-
         if (m <= 0)
                 return -EBADMSG;
 
@@ -866,6 +880,15 @@ int journal_file_find_data_object_with_hash(
         assert(f);
         assert(data || size == 0);
 
+        /* If there's no data hash table, then there's no entry. */
+        if (le64toh(f->header->data_hash_table_size) <= 0)
+                return 0;
+
+        /* Map the data hash table, if it isn't mapped yet. */
+        r = journal_file_map_data_hash_table(f);
+        if (r < 0)
+                return r;
+
         osize = offsetof(Object, data.payload) + size;
 
         m = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
@@ -2731,14 +2754,6 @@ int journal_file_open(
 #endif
         }
 
-        r = journal_file_map_field_hash_table(f);
-        if (r < 0)
-                goto fail;
-
-        r = journal_file_map_data_hash_table(f);
-        if (r < 0)
-                goto fail;
-
         if (mmap_cache_got_sigbus(f->mmap, f->fd)) {
                 r = -EIO;
                 goto fail;
diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index 403c8f760c..e92b75eabe 100644
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -229,3 +229,6 @@ int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *
 int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to);
 
 bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);
+
+int journal_file_map_data_hash_table(JournalFile *f);
+int journal_file_map_field_hash_table(JournalFile *f);
diff --git a/src/journal/journal-verify.c b/src/journal/journal-verify.c
index ce734d8df7..eaf006db7a 100644
--- a/src/journal/journal-verify.c
+++ b/src/journal/journal-verify.c
@@ -69,6 +69,16 @@ static void draw_progress(uint64_t p, usec_t *last_usec) {
         fflush(stdout);
 }
 
+static uint64_t scale_progress(uint64_t scale, uint64_t p, uint64_t m) {
+
+        /* Calculates scale * p / m, but handles m == 0 safely, and saturates */
+
+        if (p >= m || m == 0)
+                return scale;
+
+        return scale * p / m;
+}
+
 static void flush_progress(void) {
         unsigned n, i;
 
@@ -113,8 +123,10 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
          * other objects. */
 
         if ((o->object.flags & OBJECT_COMPRESSED_XZ) &&
-            o->object.type != OBJECT_DATA)
+            o->object.type != OBJECT_DATA) {
+                error(offset, "Found compressed object that isn't of type DATA, which is not allowed.");
                 return -EBADMSG;
+        }
 
         switch (o->object.type) {
 
@@ -123,15 +135,15 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                 int compression, r;
 
                 if (le64toh(o->data.entry_offset) == 0)
-                        warning(offset, "unused data (entry_offset==0)");
+                        warning(offset, "Unused data (entry_offset==0)");
 
                 if ((le64toh(o->data.entry_offset) == 0) ^ (le64toh(o->data.n_entries) == 0)) {
-                        error(offset, "bad n_entries: %"PRIu64, o->data.n_entries);
+                        error(offset, "Bad n_entries: %"PRIu64, o->data.n_entries);
                         return -EBADMSG;
                 }
 
                 if (le64toh(o->object.size) - offsetof(DataObject, payload) <= 0) {
-                        error(offset, "bad object size (<= %zu): %"PRIu64,
+                        error(offset, "Bad object size (<= %zu): %"PRIu64,
                               offsetof(DataObject, payload),
                               le64toh(o->object.size));
                         return -EBADMSG;
@@ -159,7 +171,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                         h2 = hash64(o->data.payload, le64toh(o->object.size) - offsetof(Object, data.payload));
 
                 if (h1 != h2) {
-                        error(offset, "invalid hash (%08"PRIx64" vs. %08"PRIx64, h1, h2);
+                        error(offset, "Invalid hash (%08"PRIx64" vs. %08"PRIx64, h1, h2);
                         return -EBADMSG;
                 }
 
@@ -167,7 +179,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                     !VALID64(o->data.next_field_offset) ||
                     !VALID64(o->data.entry_offset) ||
                     !VALID64(o->data.entry_array_offset)) {
-                        error(offset, "invalid offset (next_hash_offset="OFSfmt", next_field_offset="OFSfmt", entry_offset="OFSfmt", entry_array_offset="OFSfmt,
+                        error(offset, "Invalid offset (next_hash_offset="OFSfmt", next_field_offset="OFSfmt", entry_offset="OFSfmt", entry_array_offset="OFSfmt,
                               o->data.next_hash_offset,
                               o->data.next_field_offset,
                               o->data.entry_offset,
@@ -181,7 +193,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
         case OBJECT_FIELD:
                 if (le64toh(o->object.size) - offsetof(FieldObject, payload) <= 0) {
                         error(offset,
-                              "bad field size (<= %zu): %"PRIu64,
+                              "Bad field size (<= %zu): %"PRIu64,
                               offsetof(FieldObject, payload),
                               le64toh(o->object.size));
                         return -EBADMSG;
@@ -190,7 +202,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                 if (!VALID64(o->field.next_hash_offset) ||
                     !VALID64(o->field.head_data_offset)) {
                         error(offset,
-                              "invalid offset (next_hash_offset="OFSfmt", head_data_offset="OFSfmt,
+                              "Invalid offset (next_hash_offset="OFSfmt", head_data_offset="OFSfmt,
                               o->field.next_hash_offset,
                               o->field.head_data_offset);
                         return -EBADMSG;
@@ -200,7 +212,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
         case OBJECT_ENTRY:
                 if ((le64toh(o->object.size) - offsetof(EntryObject, items)) % sizeof(EntryItem) != 0) {
                         error(offset,
-                              "bad entry size (<= %zu): %"PRIu64,
+                              "Bad entry size (<= %zu): %"PRIu64,
                               offsetof(EntryObject, items),
                               le64toh(o->object.size));
                         return -EBADMSG;
@@ -208,28 +220,28 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
 
                 if ((le64toh(o->object.size) - offsetof(EntryObject, items)) / sizeof(EntryItem) <= 0) {
                         error(offset,
-                              "invalid number items in entry: %"PRIu64,
+                              "Invalid number items in entry: %"PRIu64,
                               (le64toh(o->object.size) - offsetof(EntryObject, items)) / sizeof(EntryItem));
                         return -EBADMSG;
                 }
 
                 if (le64toh(o->entry.seqnum) <= 0) {
                         error(offset,
-                              "invalid entry seqnum: %"PRIx64,
+                              "Invalid entry seqnum: %"PRIx64,
                               le64toh(o->entry.seqnum));
                         return -EBADMSG;
                 }
 
                 if (!VALID_REALTIME(le64toh(o->entry.realtime))) {
                         error(offset,
-                              "invalid entry realtime timestamp: %"PRIu64,
+                              "Invalid entry realtime timestamp: %"PRIu64,
                               le64toh(o->entry.realtime));
                         return -EBADMSG;
                 }
 
                 if (!VALID_MONOTONIC(le64toh(o->entry.monotonic))) {
                         error(offset,
-                              "invalid entry monotonic timestamp: %"PRIu64,
+                              "Invalid entry monotonic timestamp: %"PRIu64,
                               le64toh(o->entry.monotonic));
                         return -EBADMSG;
                 }
@@ -238,7 +250,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                         if (o->entry.items[i].object_offset == 0 ||
                             !VALID64(o->entry.items[i].object_offset)) {
                                 error(offset,
-                                      "invalid entry item (%"PRIu64"/%"PRIu64" offset: "OFSfmt,
+                                      "Invalid entry item (%"PRIu64"/%"PRIu64" offset: "OFSfmt,
                                       i, journal_file_entry_n_items(o),
                                       o->entry.items[i].object_offset);
                                 return -EBADMSG;
@@ -252,7 +264,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                 if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) % sizeof(HashItem) != 0 ||
                     (le64toh(o->object.size) - offsetof(HashTableObject, items)) / sizeof(HashItem) <= 0) {
                         error(offset,
-                              "invalid %s hash table size: %"PRIu64,
+                              "Invalid %s hash table size: %"PRIu64,
                               o->object.type == OBJECT_DATA_HASH_TABLE ? "data" : "field",
                               le64toh(o->object.size));
                         return -EBADMSG;
@@ -262,7 +274,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                         if (o->hash_table.items[i].head_hash_offset != 0 &&
                             !VALID64(le64toh(o->hash_table.items[i].head_hash_offset))) {
                                 error(offset,
-                                      "invalid %s hash table item (%"PRIu64"/%"PRIu64") head_hash_offset: "OFSfmt,
+                                      "Invalid %s hash table item (%"PRIu64"/%"PRIu64") head_hash_offset: "OFSfmt,
                                       o->object.type == OBJECT_DATA_HASH_TABLE ? "data" : "field",
                                       i, journal_file_hash_table_n_items(o),
                                       le64toh(o->hash_table.items[i].head_hash_offset));
@@ -271,7 +283,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                         if (o->hash_table.items[i].tail_hash_offset != 0 &&
                             !VALID64(le64toh(o->hash_table.items[i].tail_hash_offset))) {
                                 error(offset,
-                                      "invalid %s hash table item (%"PRIu64"/%"PRIu64") tail_hash_offset: "OFSfmt,
+                                      "Invalid %s hash table item (%"PRIu64"/%"PRIu64") tail_hash_offset: "OFSfmt,
                                       o->object.type == OBJECT_DATA_HASH_TABLE ? "data" : "field",
                                       i, journal_file_hash_table_n_items(o),
                                       le64toh(o->hash_table.items[i].tail_hash_offset));
@@ -281,7 +293,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                         if ((o->hash_table.items[i].head_hash_offset != 0) !=
                             (o->hash_table.items[i].tail_hash_offset != 0)) {
                                 error(offset,
-                                      "invalid %s hash table item (%"PRIu64"/%"PRIu64"): head_hash_offset="OFSfmt" tail_hash_offset="OFSfmt,
+                                      "Invalid %s hash table item (%"PRIu64"/%"PRIu64"): head_hash_offset="OFSfmt" tail_hash_offset="OFSfmt,
                                       o->object.type == OBJECT_DATA_HASH_TABLE ? "data" : "field",
                                       i, journal_file_hash_table_n_items(o),
                                       le64toh(o->hash_table.items[i].head_hash_offset),
@@ -296,14 +308,14 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                 if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) % sizeof(le64_t) != 0 ||
                     (le64toh(o->object.size) - offsetof(EntryArrayObject, items)) / sizeof(le64_t) <= 0) {
                         error(offset,
-                              "invalid object entry array size: %"PRIu64,
+                              "Invalid object entry array size: %"PRIu64,
                               le64toh(o->object.size));
                         return -EBADMSG;
                 }
 
                 if (!VALID64(o->entry_array.next_entry_array_offset)) {
                         error(offset,
-                              "invalid object entry array next_entry_array_offset: "OFSfmt,
+                              "Invalid object entry array next_entry_array_offset: "OFSfmt,
                               o->entry_array.next_entry_array_offset);
                         return -EBADMSG;
                 }
@@ -312,7 +324,7 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
                         if (le64toh(o->entry_array.items[i]) != 0 &&
                             !VALID64(le64toh(o->entry_array.items[i]))) {
                                 error(offset,
-                                      "invalid object entry array item (%"PRIu64"/%"PRIu64"): "OFSfmt,
+                                      "Invalid object entry array item (%"PRIu64"/%"PRIu64"): "OFSfmt,
                                       i, journal_file_entry_array_n_items(o),
                                       le64toh(o->entry_array.items[i]));
                                 return -EBADMSG;
@@ -323,14 +335,14 @@ static int journal_file_object_verify(JournalFile *f, uint64_t offset, Object *o
         case OBJECT_TAG:
                 if (le64toh(o->object.size) != sizeof(TagObject)) {
                         error(offset,
-                              "invalid object tag size: %"PRIu64,
+                              "Invalid object tag size: %"PRIu64,
                               le64toh(o->object.size));
                         return -EBADMSG;
                 }
 
                 if (!VALID_EPOCH(o->tag.epoch)) {
                         error(offset,
-                              "invalid object tag epoch: %"PRIu64,
+                              "Invalid object tag epoch: %"PRIu64,
                               o->tag.epoch);
                         return -EBADMSG;
                 }
@@ -403,8 +415,7 @@ static int entry_points_to_data(
         assert(entry_fd >= 0);
 
         if (!contains_uint64(f->mmap, entry_fd, n_entries, entry_p)) {
-                error(data_p,
-                      "data object references invalid entry at "OFSfmt, entry_p);
+                error(data_p, "Data object references invalid entry at "OFSfmt, entry_p);
                 return -EBADMSG;
         }
 
@@ -420,8 +431,7 @@ static int entry_points_to_data(
                 }
 
         if (!found) {
-                error(entry_p,
-                      "data object at "OFSfmt" not referenced by linked entry", data_p);
+                error(entry_p, "Data object at "OFSfmt" not referenced by linked entry", data_p);
                 return -EBADMSG;
         }
 
@@ -464,7 +474,7 @@ static int entry_points_to_data(
                                         x = z;
                         }
 
-                        error(entry_p, "entry object doesn't exist in main entry array");
+                        error(entry_p, "Entry object doesn't exist in main entry array");
                         return -EBADMSG;
                 }
 
@@ -494,9 +504,7 @@ static int verify_data(
 
         /* Entry array means at least two objects */
         if (a && n < 2) {
-                error(p,
-                      "entry array present (entry_array_offset="OFSfmt", but n_entries=%"PRIu64")",
-                      a, n);
+                error(p, "Entry array present (entry_array_offset="OFSfmt", but n_entries=%"PRIu64")", a, n);
                 return -EBADMSG;
         }
 
@@ -516,12 +524,12 @@ static int verify_data(
                 uint64_t next, m, j;
 
                 if (a == 0) {
-                        error(p, "array chain too short");
+                        error(p, "Array chain too short");
                         return -EBADMSG;
                 }
 
                 if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
-                        error(p, "invalid array offset "OFSfmt, a);
+                        error(p, "Invalid array offset "OFSfmt, a);
                         return -EBADMSG;
                 }
 
@@ -531,8 +539,7 @@ static int verify_data(
 
                 next = le64toh(o->entry_array.next_entry_array_offset);
                 if (next != 0 && next <= a) {
-                        error(p, "array chain has cycle (jumps back from "OFSfmt" to "OFSfmt")",
-                              a, next);
+                        error(p, "Array chain has cycle (jumps back from "OFSfmt" to "OFSfmt")", a, next);
                         return -EBADMSG;
                 }
 
@@ -541,7 +548,7 @@ static int verify_data(
 
                         q = le64toh(o->entry_array.items[j]);
                         if (q <= last) {
-                                error(p, "data object's entry array not sorted");
+                                error(p, "Data object's entry array not sorted");
                                 return -EBADMSG;
                         }
                         last = q;
@@ -580,11 +587,18 @@ static int verify_hash_table(
         assert(last_usec);
 
         n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
+        if (n <= 0)
+                return 0;
+
+        r = journal_file_map_data_hash_table(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to map data hash table: %m");
+
         for (i = 0; i < n; i++) {
                 uint64_t last = 0, p;
 
                 if (show_progress)
-                        draw_progress(0xC000 + (0x3FFF * i / n), last_usec);
+                        draw_progress(0xC000 + scale_progress(0x3FFF, i, n), last_usec);
 
                 p = le64toh(f->data_hash_table[i].head_hash_offset);
                 while (p != 0) {
@@ -592,8 +606,7 @@ static int verify_hash_table(
                         uint64_t next;
 
                         if (!contains_uint64(f->mmap, data_fd, n_data, p)) {
-                                error(p, "invalid data object at hash entry %"PRIu64" of %"PRIu64,
-                                      i, n);
+                                error(p, "Invalid data object at hash entry %"PRIu64" of %"PRIu64, i, n);
                                 return -EBADMSG;
                         }
 
@@ -603,14 +616,12 @@ static int verify_hash_table(
 
                         next = le64toh(o->data.next_hash_offset);
                         if (next != 0 && next <= p) {
-                                error(p, "hash chain has a cycle in hash entry %"PRIu64" of %"PRIu64,
-                                      i, n);
+                                error(p, "Hash chain has a cycle in hash entry %"PRIu64" of %"PRIu64, i, n);
                                 return -EBADMSG;
                         }
 
                         if (le64toh(o->data.hash) % n != i) {
-                                error(p, "hash value mismatch in hash entry %"PRIu64" of %"PRIu64,
-                                      i, n);
+                                error(p, "Hash value mismatch in hash entry %"PRIu64" of %"PRIu64, i, n);
                                 return -EBADMSG;
                         }
 
@@ -623,7 +634,7 @@ static int verify_hash_table(
                 }
 
                 if (last != le64toh(f->data_hash_table[i].tail_hash_offset)) {
-                        error(p, "tail hash pointer mismatch in hash table");
+                        error(p, "Tail hash pointer mismatch in hash table");
                         return -EBADMSG;
                 }
         }
@@ -637,6 +648,13 @@ static int data_object_in_hash_table(JournalFile *f, uint64_t hash, uint64_t p)
         assert(f);
 
         n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
+        if (n <= 0)
+                return 0;
+
+        r = journal_file_map_data_hash_table(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to map data hash table: %m");
+
         h = hash % n;
 
         q = le64toh(f->data_hash_table[h].head_hash_offset);
@@ -677,16 +695,16 @@ static int verify_entry(
                 h = le64toh(o->entry.items[i].hash);
 
                 if (!contains_uint64(f->mmap, data_fd, n_data, q)) {
-                        error(p, "invalid data object of entry");
-                                return -EBADMSG;
-                        }
+                        error(p, "Invalid data object of entry");
+                        return -EBADMSG;
+                }
 
                 r = journal_file_move_to_object(f, OBJECT_DATA, q, &u);
                 if (r < 0)
                         return r;
 
                 if (le64toh(u->data.hash) != h) {
-                        error(p, "hash mismatch for data object of entry");
+                        error(p, "Hash mismatch for data object of entry");
                         return -EBADMSG;
                 }
 
@@ -694,7 +712,7 @@ static int verify_entry(
                 if (r < 0)
                         return r;
                 if (r == 0) {
-                        error(p, "data object missing from hash table");
+                        error(p, "Data object missing from hash table");
                         return -EBADMSG;
                 }
         }
@@ -726,15 +744,15 @@ static int verify_entry_array(
                 Object *o;
 
                 if (show_progress)
-                        draw_progress(0x8000 + (0x3FFF * i / n), last_usec);
+                        draw_progress(0x8000 + scale_progress(0x3FFF, i, n), last_usec);
 
                 if (a == 0) {
-                        error(a, "array chain too short at %"PRIu64" of %"PRIu64, i, n);
+                        error(a, "Array chain too short at %"PRIu64" of %"PRIu64, i, n);
                         return -EBADMSG;
                 }
 
                 if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
-                        error(a, "invalid array %"PRIu64" of %"PRIu64, i, n);
+                        error(a, "Invalid array %"PRIu64" of %"PRIu64, i, n);
                         return -EBADMSG;
                 }
 
@@ -744,9 +762,7 @@ static int verify_entry_array(
 
                 next = le64toh(o->entry_array.next_entry_array_offset);
                 if (next != 0 && next <= a) {
-                        error(a,
-                              "array chain has cycle at %"PRIu64" of %"PRIu64" (jumps back from to "OFSfmt")",
-                              i, n, next);
+                        error(a, "Array chain has cycle at %"PRIu64" of %"PRIu64" (jumps back from to "OFSfmt")", i, n, next);
                         return -EBADMSG;
                 }
 
@@ -756,15 +772,13 @@ static int verify_entry_array(
 
                         p = le64toh(o->entry_array.items[j]);
                         if (p <= last) {
-                                error(a, "entry array not sorted at %"PRIu64" of %"PRIu64,
-                                      i, n);
+                                error(a, "Entry array not sorted at %"PRIu64" of %"PRIu64, i, n);
                                 return -EBADMSG;
                         }
                         last = p;
 
                         if (!contains_uint64(f->mmap, entry_fd, n_entries, p)) {
-                                error(a, "invalid array entry at %"PRIu64" of %"PRIu64,
-                                      i, n);
+                                error(a, "Invalid array entry at %"PRIu64" of %"PRIu64, i, n);
                                 return -EBADMSG;
                         }
 
@@ -852,7 +866,7 @@ int journal_file_verify(
 
         for (i = 0; i < sizeof(f->header->reserved); i++)
                 if (f->header->reserved[i] != 0) {
-                        error(offsetof(Header, reserved[i]), "reserved field is non-zero");
+                        error(offsetof(Header, reserved[i]), "Reserved field is non-zero");
                         r = -EBADMSG;
                         goto fail;
                 }
@@ -861,36 +875,37 @@ int journal_file_verify(
          * superficial structure, headers, hashes. */
 
         p = le64toh(f->header->header_size);
-        while (p != 0) {
+        for (;;) {
+                /* Early exit if there are no objects in the file, at all */
+                if (le64toh(f->header->tail_object_offset) == 0)
+                        break;
+
                 if (show_progress)
-                        draw_progress(0x7FFF * p / le64toh(f->header->tail_object_offset), &last_usec);
+                        draw_progress(scale_progress(0x7FFF, p, le64toh(f->header->tail_object_offset)), &last_usec);
 
                 r = journal_file_move_to_object(f, OBJECT_UNUSED, p, &o);
                 if (r < 0) {
-                        error(p, "invalid object");
+                        error(p, "Invalid object");
                         goto fail;
                 }
 
                 if (p > le64toh(f->header->tail_object_offset)) {
-                        error(offsetof(Header, tail_object_offset), "invalid tail object pointer");
+                        error(offsetof(Header, tail_object_offset), "Invalid tail object pointer");
                         r = -EBADMSG;
                         goto fail;
                 }
 
-                if (p == le64toh(f->header->tail_object_offset))
-                        found_last = true;
-
                 n_objects ++;
 
                 r = journal_file_object_verify(f, p, o);
                 if (r < 0) {
-                        error(p, "invalid object contents: %s", strerror(-r));
+                        error(p, "Envalid object contents: %s", strerror(-r));
                         goto fail;
                 }
 
                 if ((o->object.flags & OBJECT_COMPRESSED_XZ) &&
                     (o->object.flags & OBJECT_COMPRESSED_LZ4)) {
-                        error(p, "objected with double compression");
+                        error(p, "Objected with double compression");
                         r = -EINVAL;
                         goto fail;
                 }
@@ -923,7 +938,7 @@ int journal_file_verify(
 
                 case OBJECT_ENTRY:
                         if (JOURNAL_HEADER_SEALED(f->header) && n_tags <= 0) {
-                                error(p, "first entry before first tag");
+                                error(p, "First entry before first tag");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -933,21 +948,21 @@ int journal_file_verify(
                                 goto fail;
 
                         if (le64toh(o->entry.realtime) < last_tag_realtime) {
-                                error(p, "older entry after newer tag");
+                                error(p, "Older entry after newer tag");
                                 r = -EBADMSG;
                                 goto fail;
                         }
 
                         if (!entry_seqnum_set &&
                             le64toh(o->entry.seqnum) != le64toh(f->header->head_entry_seqnum)) {
-                                error(p, "head entry sequence number incorrect");
+                                error(p, "Head entry sequence number incorrect");
                                 r = -EBADMSG;
                                 goto fail;
                         }
 
                         if (entry_seqnum_set &&
                             entry_seqnum >= le64toh(o->entry.seqnum)) {
-                                error(p, "entry sequence number out of synchronization");
+                                error(p, "Entry sequence number out of synchronization");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -958,7 +973,7 @@ int journal_file_verify(
                         if (entry_monotonic_set &&
                             sd_id128_equal(entry_boot_id, o->entry.boot_id) &&
                             entry_monotonic > le64toh(o->entry.monotonic)) {
-                                error(p, "entry timestamp out of synchronization");
+                                error(p, "Entry timestamp out of synchronization");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -969,7 +984,7 @@ int journal_file_verify(
 
                         if (!entry_realtime_set &&
                             le64toh(o->entry.realtime) != le64toh(f->header->head_entry_realtime)) {
-                                error(p, "head entry realtime timestamp incorrect");
+                                error(p, "Head entry realtime timestamp incorrect");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -982,7 +997,7 @@ int journal_file_verify(
 
                 case OBJECT_DATA_HASH_TABLE:
                         if (n_data_hash_tables > 1) {
-                                error(p, "more than one data hash table");
+                                error(p, "More than one data hash table");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -999,14 +1014,14 @@ int journal_file_verify(
 
                 case OBJECT_FIELD_HASH_TABLE:
                         if (n_field_hash_tables > 1) {
-                                error(p, "more than one field hash table");
+                                error(p, "More than one field hash table");
                                 r = -EBADMSG;
                                 goto fail;
                         }
 
                         if (le64toh(f->header->field_hash_table_offset) != p + offsetof(HashTableObject, items) ||
                             le64toh(f->header->field_hash_table_size) != le64toh(o->object.size) - offsetof(HashTableObject, items)) {
-                                error(p, "header fields for field hash table invalid");
+                                error(p, "Header fields for field hash table invalid");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -1021,7 +1036,7 @@ int journal_file_verify(
 
                         if (p == le64toh(f->header->entry_array_offset)) {
                                 if (found_main_entry_array) {
-                                        error(p, "more than one main entry array");
+                                        error(p, "More than one main entry array");
                                         r = -EBADMSG;
                                         goto fail;
                                 }
@@ -1034,19 +1049,19 @@ int journal_file_verify(
 
                 case OBJECT_TAG:
                         if (!JOURNAL_HEADER_SEALED(f->header)) {
-                                error(p, "tag object in file without sealing");
+                                error(p, "Tag object in file without sealing");
                                 r = -EBADMSG;
                                 goto fail;
                         }
 
                         if (le64toh(o->tag.seqnum) != n_tags + 1) {
-                                error(p, "tag sequence number out of synchronization");
+                                error(p, "Tag sequence number out of synchronization");
                                 r = -EBADMSG;
                                 goto fail;
                         }
 
                         if (le64toh(o->tag.epoch) < last_epoch) {
-                                error(p, "epoch sequence out of synchronization");
+                                error(p, "Epoch sequence out of synchronization");
                                 r = -EBADMSG;
                                 goto fail;
                         }
@@ -1055,7 +1070,7 @@ int journal_file_verify(
                         if (f->seal) {
                                 uint64_t q, rt;
 
-                                debug(p, "checking tag %"PRIu64"...", le64toh(o->tag.seqnum));
+                                debug(p, "Checking tag %"PRIu64"...", le64toh(o->tag.seqnum));
 
                                 rt = f->fss_start_usec + o->tag.epoch * f->fss_interval_usec;
                                 if (entry_realtime_set && entry_realtime >= rt + f->fss_interval_usec) {
@@ -1102,7 +1117,7 @@ int journal_file_verify(
                                         goto fail;
 
                                 if (memcmp(o->tag.tag, gcry_md_read(f->hmac, 0), TAG_LENGTH) != 0) {
-                                        error(p, "tag failed verification");
+                                        error(p, "Tag failed verification");
                                         r = -EBADMSG;
                                         goto fail;
                                 }
@@ -1124,79 +1139,69 @@ int journal_file_verify(
                         n_weird ++;
                 }
 
-                if (p == le64toh(f->header->tail_object_offset))
-                        p = 0;
-                else
-                        p = p + ALIGN64(le64toh(o->object.size));
-        }
+                if (p == le64toh(f->header->tail_object_offset)) {
+                        found_last = true;
+                        break;
+                }
 
-        if (!found_last) {
-                error(le64toh(f->header->tail_object_offset), "tail object pointer dead");
+                p = p + ALIGN64(le64toh(o->object.size));
+        };
+
+        if (!found_last && le64toh(f->header->tail_object_offset) != 0) {
+                error(le64toh(f->header->tail_object_offset), "Tail object pointer dead");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (n_objects != le64toh(f->header->n_objects)) {
-                error(offsetof(Header, n_objects), "object number mismatch");
+                error(offsetof(Header, n_objects), "Object number mismatch");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (n_entries != le64toh(f->header->n_entries)) {
-                error(offsetof(Header, n_entries), "entry number mismatch");
+                error(offsetof(Header, n_entries), "Entry number mismatch");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (JOURNAL_HEADER_CONTAINS(f->header, n_data) &&
             n_data != le64toh(f->header->n_data)) {
-                error(offsetof(Header, n_data), "data number mismatch");
+                error(offsetof(Header, n_data), "Data number mismatch");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (JOURNAL_HEADER_CONTAINS(f->header, n_fields) &&
             n_fields != le64toh(f->header->n_fields)) {
-                error(offsetof(Header, n_fields), "field number mismatch");
+                error(offsetof(Header, n_fields), "Field number mismatch");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (JOURNAL_HEADER_CONTAINS(f->header, n_tags) &&
             n_tags != le64toh(f->header->n_tags)) {
-                error(offsetof(Header, n_tags), "tag number mismatch");
+                error(offsetof(Header, n_tags), "Tag number mismatch");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (JOURNAL_HEADER_CONTAINS(f->header, n_entry_arrays) &&
             n_entry_arrays != le64toh(f->header->n_entry_arrays)) {
-                error(offsetof(Header, n_entry_arrays), "entry array number mismatch");
-                r = -EBADMSG;
-                goto fail;
-        }
-
-        if (n_data_hash_tables != 1) {
-                error(0, "missing data hash table");
-                r = -EBADMSG;
-                goto fail;
-        }
-
-        if (n_field_hash_tables != 1) {
-                error(0, "missing field hash table");
+                error(offsetof(Header, n_entry_arrays), "Entry array number mismatch");
                 r = -EBADMSG;
                 goto fail;
         }
 
-        if (!found_main_entry_array) {
-                error(0, "missing entry array");
+        if (!found_main_entry_array && le64toh(f->header->entry_array_offset) != 0) {
+                error(0, "Missing entry array");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (entry_seqnum_set &&
             entry_seqnum != le64toh(f->header->tail_entry_seqnum)) {
-                error(offsetof(Header, tail_entry_seqnum), "invalid tail seqnum");
+                error(offsetof(Header, tail_entry_seqnum), "Invalid tail seqnum");
                 r = -EBADMSG;
                 goto fail;
         }
@@ -1204,13 +1209,13 @@ int journal_file_verify(
         if (entry_monotonic_set &&
             (!sd_id128_equal(entry_boot_id, f->header->boot_id) ||
              entry_monotonic != le64toh(f->header->tail_entry_monotonic))) {
-                error(0, "invalid tail monotonic timestamp");
+                error(0, "Invalid tail monotonic timestamp");
                 r = -EBADMSG;
                 goto fail;
         }
 
         if (entry_realtime_set && entry_realtime != le64toh(f->header->tail_entry_realtime)) {
-                error(0, "invalid tail realtime timestamp");
+                error(0, "Invalid tail realtime timestamp");
                 r = -EBADMSG;
                 goto fail;
         }
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 2d6ecfb750..073cc77711 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -2066,6 +2066,10 @@ int main(int argc, char *argv[]) {
                 log_error_errno(r, "Failed to iterate through journal: %m");
                 goto finish;
         }
+        if (r == 0) {
+                printf("-- No entries --\n");
+                goto finish;
+        }
 
         if (!arg_follow)
                 pager_open_if_enabled();