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journal: Add compact mode

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This adds a new flag in preparation for incompatible journal changes
which will be gated behind this flag. The max file size of journal
files in compact mode is limited to 4 GiB.
This commit is contained in:
Daan De Meyer 2021-10-23 22:24:56 +01:00
parent c76691d708
commit 87413812c9
4 changed files with 23 additions and 6 deletions
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4
docs/JOURNAL_FILE_FORMAT.md
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@ -259,6 +259,7 @@ enum {
HEADER_INCOMPATIBLE_COMPRESSED_LZ4 = 1 << 1,
HEADER_INCOMPATIBLE_KEYED_HASH = 1 << 2,
HEADER_INCOMPATIBLE_COMPRESSED_ZSTD = 1 << 3,
HEADER_INCOMPATIBLE_COMPACT = 1 << 4,
};
enum {
@ -276,6 +277,9 @@ HEADER_INCOMPATIBLE_KEYED_HASH indicates that instead of the unkeyed Jenkins
hash function the keyed siphash24 hash function is used for the two hash
tables, see below.
HEADER_INCOMPATIBLE_COMPACT indicates that the journal file uses the new binary
format that uses less space on disk compared to the original format.
HEADER_COMPATIBLE_SEALED indicates that the file includes TAG objects required
for Forward Secure Sealing.

7
src/libsystemd/sd-journal/journal-def.h
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@ -152,19 +152,22 @@ enum {
HEADER_INCOMPATIBLE_COMPRESSED_LZ4 = 1 << 1,
HEADER_INCOMPATIBLE_KEYED_HASH = 1 << 2,
HEADER_INCOMPATIBLE_COMPRESSED_ZSTD = 1 << 3,
HEADER_INCOMPATIBLE_COMPACT = 1 << 4,
};
#define HEADER_INCOMPATIBLE_ANY \
(HEADER_INCOMPATIBLE_COMPRESSED_XZ | \
HEADER_INCOMPATIBLE_COMPRESSED_LZ4 | \
HEADER_INCOMPATIBLE_KEYED_HASH | \
HEADER_INCOMPATIBLE_COMPRESSED_ZSTD)
HEADER_INCOMPATIBLE_COMPRESSED_ZSTD | \
HEADER_INCOMPATIBLE_COMPACT)
#define HEADER_INCOMPATIBLE_SUPPORTED \
((HAVE_XZ ? HEADER_INCOMPATIBLE_COMPRESSED_XZ : 0) | \
(HAVE_LZ4 ? HEADER_INCOMPATIBLE_COMPRESSED_LZ4 : 0) | \
(HAVE_ZSTD ? HEADER_INCOMPATIBLE_COMPRESSED_ZSTD : 0) | \
HEADER_INCOMPATIBLE_KEYED_HASH)
HEADER_INCOMPATIBLE_KEYED_HASH | \
HEADER_INCOMPATIBLE_COMPACT)
enum {
HEADER_COMPATIBLE_SEALED = 1 << 0,

15
src/libsystemd/sd-journal/journal-file.c
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@ -44,6 +44,7 @@
/* This is the minimum journal file size */
#define JOURNAL_FILE_SIZE_MIN (512 * 1024ULL) /* 512 KiB */
#define JOURNAL_COMPACT_SIZE_MAX UINT32_MAX /* 4 GiB */
/* These are the lower and upper bounds if we deduce the max_use value
* from the file system size */
@ -387,7 +388,7 @@ static bool warn_wrong_flags(const JournalFile *f, bool compatible) {
f->path, type, flags & ~any);
flags = (flags & any) & ~supported;
if (flags) {
const char* strv[5];
const char* strv[6];
size_t n = 0;
_cleanup_free_ char *t = NULL;
@ -403,6 +404,8 @@ static bool warn_wrong_flags(const JournalFile *f, bool compatible) {
strv[n++] = "zstd-compressed";
if (flags & HEADER_INCOMPATIBLE_KEYED_HASH)
strv[n++] = "keyed-hash";
if (flags & HEADER_INCOMPATIBLE_COMPACT)
strv[n++] = "compact";
}
strv[n] = NULL;
assert(n < ELEMENTSOF(strv));
@ -3229,7 +3232,7 @@ void journal_file_print_header(JournalFile *f) {
"Sequential number ID: %s\n"
"State: %s\n"
"Compatible flags:%s%s\n"
"Incompatible flags:%s%s%s%s%s\n"
"Incompatible flags:%s%s%s%s%s%s\n"
"Header size: %"PRIu64"\n"
"Arena size: %"PRIu64"\n"
"Data hash table size: %"PRIu64"\n"
@ -3256,6 +3259,7 @@ void journal_file_print_header(JournalFile *f) {
JOURNAL_HEADER_COMPRESSED_LZ4(f->header) ? " COMPRESSED-LZ4" : "",
JOURNAL_HEADER_COMPRESSED_ZSTD(f->header) ? " COMPRESSED-ZSTD" : "",
JOURNAL_HEADER_KEYED_HASH(f->header) ? " KEYED-HASH" : "",
JOURNAL_HEADER_COMPACT(f->header) ? " COMPACT" : "",
(le32toh(f->header->incompatible_flags) & ~HEADER_INCOMPATIBLE_ANY) ? " ???" : "",
le64toh(f->header->header_size),
le64toh(f->header->arena_size),
@ -3336,7 +3340,7 @@ static int journal_file_warn_btrfs(JournalFile *f) {
return 1;
}
static void journal_default_metrics(JournalMetrics *m, int fd) {
static void journal_default_metrics(JournalMetrics *m, int fd, bool compact) {
struct statvfs ss;
uint64_t fs_size = 0;
@ -3379,6 +3383,9 @@ static void journal_default_metrics(JournalMetrics *m, int fd) {
else
m->max_size = PAGE_ALIGN(m->max_size);
if (compact && m->max_size > JOURNAL_COMPACT_SIZE_MAX)
m->max_size = JOURNAL_COMPACT_SIZE_MAX;
if (m->max_size != 0) {
if (m->max_size < JOURNAL_FILE_SIZE_MIN)
m->max_size = JOURNAL_FILE_SIZE_MIN;
@ -3570,7 +3577,7 @@ int journal_file_open(
if (journal_file_writable(f)) {
if (metrics) {
journal_default_metrics(metrics, f->fd);
journal_default_metrics(metrics, f->fd, JOURNAL_HEADER_COMPACT(f->header));
f->metrics = *metrics;
} else if (template)
f->metrics = template->metrics;

3
src/libsystemd/sd-journal/journal-file.h
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@ -184,6 +184,9 @@ static inline bool VALID_EPOCH(uint64_t u) {
#define JOURNAL_HEADER_KEYED_HASH(h) \
FLAGS_SET(le32toh((h)->incompatible_flags), HEADER_INCOMPATIBLE_KEYED_HASH)
#define JOURNAL_HEADER_COMPACT(h) \
FLAGS_SET(le32toh((h)->incompatible_flags), HEADER_INCOMPATIBLE_COMPACT)
int journal_file_move_to_object(JournalFile *f, ObjectType type, uint64_t offset, Object **ret);
int journal_file_read_object_header(JournalFile *f, ObjectType type, uint64_t offset, Object *ret);