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-rw-r--r--src/journal/journal-file.c171
-rw-r--r--src/journal/journal-file.h24
-rw-r--r--src/journal/journal-internal.h2
-rw-r--r--src/journal/journald.c15
-rw-r--r--src/journal/journald.h2
-rw-r--r--src/journal/mmap-cache.c577
-rw-r--r--src/journal/mmap-cache.h34
-rw-r--r--src/journal/sd-journal.c16
-rw-r--r--src/journal/test-journal-stream.c6
-rw-r--r--src/journal/test-journal.c2
10 files changed, 705 insertions, 144 deletions
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index 9235e5fea..1f5e04d79 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -36,8 +36,6 @@
#define DEFAULT_DATA_HASH_TABLE_SIZE (2047ULL*sizeof(HashItem))
#define DEFAULT_FIELD_HASH_TABLE_SIZE (333ULL*sizeof(HashItem))
-#define DEFAULT_WINDOW_SIZE (8ULL*1024ULL*1024ULL)
-
#define COMPRESSION_SIZE_THRESHOLD (512ULL)
/* This is the minimum journal file size */
@@ -71,8 +69,6 @@ static int journal_file_maybe_append_tag(JournalFile *f, uint64_t realtime);
static int journal_file_hmac_put_object(JournalFile *f, int type, uint64_t p);
void journal_file_close(JournalFile *f) {
- int t;
-
assert(f);
/* Write the final tag */
@@ -80,9 +76,8 @@ void journal_file_close(JournalFile *f) {
journal_file_append_tag(f);
/* Sync everything to disk, before we mark the file offline */
- for (t = 0; t < _WINDOW_MAX; t++)
- if (f->windows[t].ptr)
- munmap(f->windows[t].ptr, f->windows[t].size);
+ if (f->mmap && f->fd >= 0)
+ mmap_cache_close_fd(f->mmap, f->fd);
if (f->writable && f->fd >= 0)
fdatasync(f->fd);
@@ -100,6 +95,9 @@ void journal_file_close(JournalFile *f) {
free(f->path);
+ if (f->mmap)
+ mmap_cache_unref(f->mmap);
+
#ifdef HAVE_XZ
free(f->compress_buffer);
#endif
@@ -305,59 +303,11 @@ static int journal_file_allocate(JournalFile *f, uint64_t offset, uint64_t size)
return 0;
}
-static int journal_file_map(
- JournalFile *f,
- uint64_t offset,
- uint64_t size,
- void **_window,
- uint64_t *_woffset,
- uint64_t *_wsize,
- void **ret) {
-
- uint64_t woffset, wsize;
- void *window;
-
+static int journal_file_move_to(JournalFile *f, int context, uint64_t offset, uint64_t size, void **ret) {
assert(f);
- assert(size > 0);
assert(ret);
- woffset = offset & ~((uint64_t) page_size() - 1ULL);
- wsize = size + (offset - woffset);
- wsize = PAGE_ALIGN(wsize);
-
/* Avoid SIGBUS on invalid accesses */
- if (woffset + wsize > (uint64_t) PAGE_ALIGN(f->last_stat.st_size))
- return -EADDRNOTAVAIL;
-
- window = mmap(NULL, wsize, f->prot, MAP_SHARED, f->fd, woffset);
- if (window == MAP_FAILED)
- return -errno;
-
- if (_window)
- *_window = window;
-
- if (_woffset)
- *_woffset = woffset;
-
- if (_wsize)
- *_wsize = wsize;
-
- *ret = (uint8_t*) window + (offset - woffset);
-
- return 0;
-}
-
-static int journal_file_move_to(JournalFile *f, int wt, uint64_t offset, uint64_t size, void **ret) {
- void *p = NULL;
- uint64_t delta;
- int r;
- Window *w;
-
- assert(f);
- assert(ret);
- assert(wt >= 0);
- assert(wt < _WINDOW_MAX);
-
if (offset + size > (uint64_t) f->last_stat.st_size) {
/* Hmm, out of range? Let's refresh the fstat() data
* first, before we trust that check. */
@@ -367,57 +317,7 @@ static int journal_file_move_to(JournalFile *f, int wt, uint64_t offset, uint64_
return -EADDRNOTAVAIL;
}
- w = f->windows + wt;
-
- if (_likely_(w->ptr &&
- w->offset <= offset &&
- w->offset + w->size >= offset + size)) {
-
- *ret = (uint8_t*) w->ptr + (offset - w->offset);
- return 0;
- }
-
- if (w->ptr) {
- if (munmap(w->ptr, w->size) < 0)
- return -errno;
-
- w->ptr = NULL;
- w->size = w->offset = 0;
- }
-
- if (size < DEFAULT_WINDOW_SIZE) {
- /* If the default window size is larger then what was
- * asked for extend the mapping a bit in the hope to
- * minimize needed remappings later on. We add half
- * the window space before and half behind the
- * requested mapping */
-
- delta = (DEFAULT_WINDOW_SIZE - size) / 2;
-
- if (delta > offset)
- delta = offset;
-
- offset -= delta;
- size = DEFAULT_WINDOW_SIZE;
- } else
- delta = 0;
-
- if (offset + size > (uint64_t) f->last_stat.st_size)
- size = (uint64_t) f->last_stat.st_size - offset;
-
- if (size <= 0)
- return -EADDRNOTAVAIL;
-
- r = journal_file_map(f,
- offset, size,
- &w->ptr, &w->offset, &w->size,
- &p);
-
- if (r < 0)
- return r;
-
- *ret = (uint8_t*) p + delta;
- return 0;
+ return mmap_cache_get(f->mmap, f->fd, f->prot, context, offset, size, ret);
}
static bool verify_hash(Object *o) {
@@ -437,17 +337,38 @@ static bool verify_hash(Object *o) {
return h1 == h2;
}
+static uint64_t minimum_header_size(Object *o) {
+
+ static uint64_t table[] = {
+ [OBJECT_DATA] = sizeof(DataObject),
+ [OBJECT_FIELD] = sizeof(FieldObject),
+ [OBJECT_ENTRY] = sizeof(EntryObject),
+ [OBJECT_DATA_HASH_TABLE] = sizeof(HashTableObject),
+ [OBJECT_FIELD_HASH_TABLE] = sizeof(HashTableObject),
+ [OBJECT_ENTRY_ARRAY] = sizeof(EntryArrayObject),
+ [OBJECT_TAG] = sizeof(TagObject),
+ };
+
+ if (o->object.type >= ELEMENTSOF(table) || table[o->object.type] <= 0)
+ return sizeof(ObjectHeader);
+
+ return table[o->object.type];
+}
+
int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Object **ret) {
int r;
void *t;
Object *o;
uint64_t s;
+ unsigned context;
assert(f);
assert(ret);
- assert(type < _OBJECT_TYPE_MAX);
- r = journal_file_move_to(f, type >= 0 ? type : WINDOW_UNKNOWN, offset, sizeof(ObjectHeader), &t);
+ /* One context for each type, plus one catch-all for the rest */
+ context = type > 0 && type < _OBJECT_TYPE_MAX ? type : 0;
+
+ r = journal_file_move_to(f, context, offset, sizeof(ObjectHeader), &t);
if (r < 0)
return r;
@@ -457,6 +378,12 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec
if (s < sizeof(ObjectHeader))
return -EBADMSG;
+ if (o->object.type <= OBJECT_UNUSED)
+ return -EBADMSG;
+
+ if (s < minimum_header_size(o))
+ return -EBADMSG;
+
if (type >= 0 && o->object.type != type)
return -EBADMSG;
@@ -508,6 +435,7 @@ static int journal_file_append_object(JournalFile *f, int type, uint64_t size, O
void *t;
assert(f);
+ assert(type > 0 && type < _OBJECT_TYPE_MAX);
assert(size >= sizeof(ObjectHeader));
assert(offset);
assert(ret);
@@ -613,7 +541,7 @@ static int journal_file_map_data_hash_table(JournalFile *f) {
s = le64toh(f->header->data_hash_table_size);
r = journal_file_move_to(f,
- WINDOW_DATA_HASH_TABLE,
+ OBJECT_DATA_HASH_TABLE,
p, s,
&t);
if (r < 0)
@@ -634,7 +562,7 @@ static int journal_file_map_field_hash_table(JournalFile *f) {
s = le64toh(f->header->field_hash_table_size);
r = journal_file_move_to(f,
- WINDOW_FIELD_HASH_TABLE,
+ OBJECT_FIELD_HASH_TABLE,
p, s,
&t);
if (r < 0)
@@ -2428,6 +2356,7 @@ int journal_file_open(
bool compress,
bool authenticate,
JournalMetrics *metrics,
+ MMapCache *mmap_cache,
JournalFile *template,
JournalFile **ret) {
@@ -2457,6 +2386,19 @@ int journal_file_open(
f->compress = compress;
f->authenticate = authenticate;
+ if (mmap_cache)
+ f->mmap = mmap_cache_ref(mmap_cache);
+ else {
+ /* One context for each type, plus the zeroth catchall
+ * context. One fd for the file plus one for each type
+ * (which we need during verification */
+ f->mmap = mmap_cache_new(_OBJECT_TYPE_MAX, 1 + _OBJECT_TYPE_MAX);
+ if (!f->mmap) {
+ r = -ENOMEM;
+ goto fail;
+ }
+ }
+
f->path = strdup(fname);
if (!f->path) {
r = -ENOMEM;
@@ -2605,7 +2547,7 @@ int journal_file_rotate(JournalFile **f, bool compress, bool authenticate) {
old_file->header->state = STATE_ARCHIVED;
- r = journal_file_open(old_file->path, old_file->flags, old_file->mode, compress, authenticate, NULL, old_file, &new_file);
+ r = journal_file_open(old_file->path, old_file->flags, old_file->mode, compress, authenticate, NULL, old_file->mmap, old_file, &new_file);
journal_file_close(old_file);
*f = new_file;
@@ -2619,6 +2561,7 @@ int journal_file_open_reliably(
bool compress,
bool authenticate,
JournalMetrics *metrics,
+ MMapCache *mmap,
JournalFile *template,
JournalFile **ret) {
@@ -2626,7 +2569,7 @@ int journal_file_open_reliably(
size_t l;
char *p;
- r = journal_file_open(fname, flags, mode, compress, authenticate, metrics, template, ret);
+ r = journal_file_open(fname, flags, mode, compress, authenticate, metrics, mmap, template, ret);
if (r != -EBADMSG && /* corrupted */
r != -ENODATA && /* truncated */
r != -EHOSTDOWN && /* other machine */
@@ -2660,7 +2603,7 @@ int journal_file_open_reliably(
log_warning("File %s corrupted or uncleanly shut down, renaming and replacing.", fname);
- return journal_file_open(fname, flags, mode, compress, authenticate, metrics, template, ret);
+ return journal_file_open(fname, flags, mode, compress, authenticate, metrics, mmap, template, ret);
}
struct vacuum_info {
diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index a16c8ffc3..11a1c7d64 100644
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -32,24 +32,7 @@
#include "sparse-endian.h"
#include "journal-def.h"
#include "util.h"
-
-typedef struct Window {
- void *ptr;
- uint64_t offset;
- uint64_t size;
-} Window;
-
-enum {
- WINDOW_UNKNOWN = OBJECT_UNUSED,
- WINDOW_DATA = OBJECT_DATA,
- WINDOW_ENTRY = OBJECT_ENTRY,
- WINDOW_DATA_HASH_TABLE = OBJECT_DATA_HASH_TABLE,
- WINDOW_FIELD_HASH_TABLE = OBJECT_FIELD_HASH_TABLE,
- WINDOW_ENTRY_ARRAY = OBJECT_ENTRY_ARRAY,
- WINDOW_TAG = OBJECT_TAG,
- WINDOW_HEADER,
- _WINDOW_MAX
-};
+#include "mmap-cache.h"
typedef struct JournalMetrics {
uint64_t max_use;
@@ -76,11 +59,10 @@ typedef struct JournalFile {
HashItem *data_hash_table;
HashItem *field_hash_table;
- Window windows[_WINDOW_MAX];
-
uint64_t current_offset;
JournalMetrics metrics;
+ MMapCache *mmap;
#ifdef HAVE_XZ
void *compress_buffer;
@@ -108,6 +90,7 @@ int journal_file_open(
bool compress,
bool authenticate,
JournalMetrics *metrics,
+ MMapCache *mmap,
JournalFile *template,
JournalFile **ret);
@@ -120,6 +103,7 @@ int journal_file_open_reliably(
bool compress,
bool authenticate,
JournalMetrics *metrics,
+ MMapCache *mmap,
JournalFile *template,
JournalFile **ret);
diff --git a/src/journal/journal-internal.h b/src/journal/journal-internal.h
index d17fdb2e9..86519be3d 100644
--- a/src/journal/journal-internal.h
+++ b/src/journal/journal-internal.h
@@ -92,6 +92,7 @@ struct sd_journal {
char *path;
Hashmap *files;
+ MMapCache *mmap;
Location current_location;
@@ -110,4 +111,3 @@ struct sd_journal {
char *journal_make_match_string(sd_journal *j);
void journal_print_header(sd_journal *j);
-
diff --git a/src/journal/journald.c b/src/journal/journald.c
index 8c41d9bab..145663bf5 100644
--- a/src/journal/journald.c
+++ b/src/journal/journald.c
@@ -315,7 +315,7 @@ static JournalFile* find_journal(Server *s, uid_t uid) {
journal_file_close(f);
}
- r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, false, &s->system_metrics, s->system_journal, &f);
+ r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, false, &s->system_metrics, s->mmap, s->system_journal, &f);
free(p);
if (r < 0)
@@ -2006,7 +2006,7 @@ static int system_journal_open(Server *s) {
if (!fn)
return -ENOMEM;
- r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, true, &s->system_metrics, NULL, &s->system_journal);
+ r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, true, &s->system_metrics, s->mmap, NULL, &s->system_journal);
free(fn);
if (r >= 0)
@@ -2033,7 +2033,7 @@ static int system_journal_open(Server *s) {
* if it already exists, so that we can flush
* it into the system journal */
- r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, NULL, &s->runtime_journal);
+ r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
free(fn);
if (r < 0) {
@@ -2049,7 +2049,7 @@ static int system_journal_open(Server *s) {
* it if necessary. */
(void) mkdir_parents(fn, 0755);
- r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, NULL, &s->runtime_journal);
+ r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
free(fn);
if (r < 0) {
@@ -2793,6 +2793,10 @@ static int server_init(Server *s) {
if (!s->user_journals)
return log_oom();
+ s->mmap = mmap_cache_new(_OBJECT_TYPE_MAX, USER_JOURNALS_MAX + 2);
+ if (!s->mmap)
+ return log_oom();
+
s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (s->epoll_fd < 0) {
log_error("Failed to create epoll object: %m");
@@ -2919,6 +2923,9 @@ static void server_done(Server *s) {
free(s->buffer);
free(s->tty_path);
+
+ if (s->mmap)
+ mmap_cache_unref(s->mmap);
}
int main(int argc, char *argv[]) {
diff --git a/src/journal/journald.h b/src/journal/journald.h
index d08a19478..0202893d8 100644
--- a/src/journal/journald.h
+++ b/src/journal/journald.h
@@ -93,6 +93,8 @@ typedef struct Server {
Storage storage;
+ MMapCache *mmap;
+
bool dev_kmsg_readable;
uint64_t *kernel_seqnum;
diff --git a/src/journal/mmap-cache.c b/src/journal/mmap-cache.c
new file mode 100644
index 000000000..68dbe7015
--- /dev/null
+++ b/src/journal/mmap-cache.c
@@ -0,0 +1,577 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "util.h"
+
+#include "mmap-cache.h"
+
+#define WINDOW_SIZE (8ULL*1024ULL*1024ULL)
+#define WINDOWS_MAX 32
+
+typedef struct Window {
+ int fd;
+ void *ptr;
+ uint64_t offset;
+ uint64_t size;
+
+ unsigned n_ref;
+ unsigned lru_prev;
+ unsigned lru_next;
+
+ unsigned by_fd_prev;
+ unsigned by_fd_next;
+} Window;
+
+typedef struct FileDescriptor {
+ int fd;
+ unsigned windows;
+} FileDescriptor;
+
+struct MMapCache {
+ unsigned n_ref;
+
+ unsigned contexts_max;
+ unsigned windows_max;
+ unsigned fds_max;
+
+ unsigned n_windows;
+ unsigned n_fds;
+
+ unsigned lru_first, lru_last;
+
+ Window *windows;
+ unsigned *by_context;
+ FileDescriptor *by_fd;
+};
+
+static void mmap_cache_window_unmap(MMapCache *m, unsigned w) {
+ Window *v;
+
+ assert(m);
+ assert(w < m->n_windows);
+
+ v = m->windows + w;
+ if (!v->ptr)
+ return;
+
+ munmap(v->ptr, v->size);
+ v->ptr = NULL;
+}
+
+static void mmap_cache_window_add_lru(MMapCache *m, unsigned w) {
+ Window *v;
+
+ assert(m);
+ assert(w < m->n_windows);
+
+ v = m->windows + w;
+ v->lru_prev = m->lru_last;
+ v->lru_next = (unsigned) -1;
+
+ m->lru_last = w;
+ if (m->lru_first == (unsigned) -1)
+ m->lru_first = w;
+}
+
+static void mmap_cache_window_remove_lru(MMapCache *m, unsigned w) {
+ Window *v;
+
+ assert(m);
+ assert(w < m->n_windows);
+
+ v = m->windows + w;
+
+ if (v->lru_prev == (unsigned) -1)
+ m->lru_first = v->lru_next;
+ else
+ m->windows[v->lru_prev].lru_next = v->lru_next;
+
+ if (v->lru_next == (unsigned) -1)
+ m->lru_last = v->lru_prev;
+ else
+ m->windows[v->lru_next].lru_prev = v->lru_prev;
+}
+
+static void mmap_cache_fd_add(MMapCache *m, unsigned fd_index, unsigned w) {
+ Window *v;
+
+ assert(m);
+ assert(fd_index < m->n_fds);
+
+ v = m->windows + w;
+ v->by_fd_next = m->by_fd[fd_index].windows;
+ v->by_fd_prev = (unsigned) -1;
+
+ m->by_fd[fd_index].windows = w;
+}
+
+static void mmap_cache_fd_remove(MMapCache *m, unsigned fd_index, unsigned w) {
+ Window *v;
+
+ assert(m);
+ assert(fd_index < m->n_fds);
+
+ v = m->windows + w;
+ if (v->by_fd_prev == (unsigned) -1)
+ m->by_fd[fd_index].windows = v->by_fd_next;
+ else
+ m->windows[v->by_fd_prev].by_fd_next = v->by_fd_next;
+
+ if (v->by_fd_next != (unsigned) -1)
+ m->windows[v->by_fd_next].by_fd_prev = v->by_fd_prev;
+}
+
+static void mmap_cache_context_unset(MMapCache *m, unsigned c) {
+ Window *v;
+ unsigned w;
+
+ assert(m);
+ assert(c < m->contexts_max);
+
+ if (m->by_context[c] == (unsigned) -1)
+ return;
+
+ w = m->by_context[c];
+ m->by_context[c] = (unsigned) -1;
+
+ v = m->windows + w;
+ assert(v->n_ref > 0);
+ v->n_ref --;
+
+ if (v->n_ref == 0)
+ mmap_cache_window_add_lru(m, w);
+}
+
+static void mmap_cache_context_set(MMapCache *m, unsigned c, unsigned w) {
+ Window *v;
+
+ assert(m);
+ assert(c < m->contexts_max);
+ assert(w < m->n_windows);
+
+ if (m->by_context[c] == w)
+ return;
+
+ mmap_cache_context_unset(m, c);
+
+ m->by_context[c] = w;
+
+ v = m->windows + w;
+ v->n_ref ++;
+ if (v->n_ref == 1)
+ mmap_cache_window_remove_lru(m, w);
+}
+
+static void mmap_cache_free(MMapCache *m) {
+
+ assert(m);
+
+ if (m->windows) {
+ unsigned w;
+
+ for (w = 0; w < m->n_windows; w++)
+ mmap_cache_window_unmap(m, w);
+
+ free(m->windows);
+ }
+
+ free(m->by_context);
+ free(m->by_fd);
+ free(m);
+}
+
+MMapCache* mmap_cache_new(unsigned contexts_max, unsigned fds_max) {
+ MMapCache *m;
+
+ assert(contexts_max > 0);
+ assert(fds_max > 0);
+
+ m = new0(MMapCache, 1);
+ if (!m)
+ return NULL;
+
+ m->contexts_max = contexts_max;
+ m->fds_max = fds_max;
+ m->windows_max = MAX(m->contexts_max, WINDOWS_MAX);
+ m->n_ref = 1;
+ m->lru_first = (unsigned) -1;
+ m->lru_last = (unsigned) -1;
+
+ m->windows = new(Window, m->windows_max);
+ if (!m->windows) {
+ mmap_cache_free(m);
+ return NULL;
+ }
+
+ m->by_context = new(unsigned, m->contexts_max);
+ if (!m->by_context) {
+ mmap_cache_free(m);
+ return NULL;
+ }
+
+ memset(m->by_context, -1, m->contexts_max * sizeof(unsigned));
+
+ m->by_fd = new(FileDescriptor, m->fds_max);
+ if (!m->by_fd) {
+ mmap_cache_free(m);
+ return NULL;
+ }
+
+ return m;
+}
+
+MMapCache* mmap_cache_ref(MMapCache *m) {
+ assert(m);
+ assert(m->n_ref > 0);
+
+ m->n_ref++;
+ return m;
+}
+
+MMapCache* mmap_cache_unref(MMapCache *m) {
+ assert(m);
+ assert(m->n_ref > 0);
+
+ if (m->n_ref == 1)
+ mmap_cache_free(m);
+ else
+ m->n_ref--;
+
+ return NULL;
+}
+
+static int mmap_cache_allocate_window(MMapCache *m, unsigned *w) {
+ assert(m);
+ assert(w);
+
+ if (m->n_windows < m->windows_max) {
+ *w = m->n_windows ++;
+ return 0;
+ }
+
+ if (m->lru_first == (unsigned) -1)
+ return -E2BIG;
+
+ *w = m->lru_first;
+ mmap_cache_window_unmap(m, *w);
+ mmap_cache_window_remove_lru(m, *w);
+
+ return 0;
+}
+
+static int mmap_cache_make_room(MMapCache *m) {
+ unsigned w;
+
+ assert(m);
+
+ w = m->lru_first;
+ while (w != (unsigned) -1) {
+ Window *v;
+
+ v = m->windows + w;
+
+ if (v->ptr) {
+ mmap_cache_window_unmap(m, w);
+ return 1;
+ }
+
+ w = v->lru_next;
+ }
+
+ return 0;
+}
+
+static int mmap_cache_put(
+ MMapCache *m,
+ int fd,
+ unsigned fd_index,
+ int prot,
+ unsigned context,
+ uint64_t offset,
+ uint64_t size,
+ void **ret) {
+
+ unsigned w;
+ Window *v;
+ void *d;
+ uint64_t woffset, wsize;
+ int r;
+
+ assert(m);
+ assert(fd >= 0);
+ assert(context < m->contexts_max);
+ assert(size > 0);
+ assert(ret);
+
+ woffset = offset & ~((uint64_t) page_size() - 1ULL);
+ wsize = size + (offset - woffset);
+ wsize = PAGE_ALIGN(wsize);
+
+ if (wsize < WINDOW_SIZE) {
+ uint64_t delta;
+
+ delta = (WINDOW_SIZE - wsize) / 2;
+
+ if (delta > offset)
+ woffset = 0;
+ else
+ woffset -= delta;
+
+ wsize = WINDOW_SIZE;
+ }
+
+ for (;;) {
+ d = mmap(NULL, wsize, prot, MAP_SHARED, fd, woffset);
+ if (d != MAP_FAILED)
+ break;
+ if (errno != ENOMEM)
+ return -errno;
+
+ r = mmap_cache_make_room(m);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOMEM;
+ }
+
+ r = mmap_cache_allocate_window(m, &w);
+ if (r < 0) {
+ munmap(d, wsize);
+ return r;
+ }
+
+ v = m->windows + w;
+ v->fd = fd;
+ v->ptr = d;
+ v->offset = woffset;
+ v->size = wsize;
+
+ v->n_ref = 0;
+ v->lru_prev = v->lru_next = (unsigned) -1;
+
+ mmap_cache_fd_add(m, fd_index, w);
+ mmap_cache_context_set(m, context, w);
+
+ *ret = (uint8_t*) d + (offset - woffset);
+ return 1;
+}
+
+static int fd_cmp(const void *_a, const void *_b) {
+ const FileDescriptor *a = _a, *b = _b;
+
+ if (a->fd < b->fd)
+ return -1;
+ if (a->fd > b->fd)
+ return 1;
+
+ return 0;
+}
+
+static int mmap_cache_get_fd_index(MMapCache *m, int fd, unsigned *fd_index) {
+ FileDescriptor *j;
+
+ assert(m);
+ assert(fd >= 0);
+ assert(fd_index);
+
+ j = bsearch(&fd, m->by_fd, m->n_fds, sizeof(m->by_fd[0]), fd_cmp);
+ if (!j) {
+ if (m->n_fds >= m->fds_max)
+ return -E2BIG;
+
+ j = m->by_fd + m->n_fds ++;
+ j->fd = fd;
+ j->windows = (unsigned) -1;
+
+ qsort(m->by_fd, m->n_fds, sizeof(m->by_fd[0]), fd_cmp);
+ j = bsearch(&fd, m->by_fd, m->n_fds, sizeof(m->by_fd[0]), fd_cmp);
+ }
+
+ *fd_index = (unsigned) (j - m->by_fd);
+ return 0;
+}
+
+static bool mmap_cache_test_window(
+ MMapCache *m,
+ unsigned w,
+ uint64_t offset,
+ uint64_t size) {
+ Window *v;
+
+ assert(m);
+ assert(w < m->n_windows);
+ assert(size > 0);
+
+ v = m->windows + w;
+
+ return offset >= v->offset &&
+ offset + size <= v->offset + v->size;
+}
+
+static int mmap_cache_current(
+ MMapCache *m,
+ int fd,
+ unsigned context,
+ uint64_t offset,
+ uint64_t size,
+ void **ret) {
+
+ Window *v;
+ unsigned w;
+
+ assert(m);
+ assert(fd >= 0);
+ assert(context < m->contexts_max);
+ assert(size > 0);
+ assert(ret);
+
+ if (m->by_context[context] == (unsigned) -1)
+ return 0;
+
+ w = m->by_context[context];
+ v = m->windows + w;
+
+ if (v->fd != fd)
+ return 0;
+
+ if (!mmap_cache_test_window(m, w, offset, size))
+ return 0;
+
+ *ret = (uint8_t*) v->ptr + (offset - v->offset);
+ return 1;
+}
+
+static int mmap_cache_find(
+ MMapCache *m,
+ unsigned fd_index,
+ unsigned context,
+ uint64_t offset,
+ uint64_t size,
+ void **ret) {
+
+ Window *v = NULL;
+ unsigned w;
+
+ assert(m);
+ assert(fd_index < m->n_fds);
+ assert(context < m->contexts_max);
+ assert(size > 0);
+ assert(ret);
+
+ w = m->by_fd[fd_index].windows;
+ while (w != (unsigned) -1) {
+ if (mmap_cache_test_window(m, w, offset, size))
+ break;
+
+ w = m->windows[w].by_fd_next;
+ }
+
+ if (w == (unsigned) -1)
+ return 0;
+
+ mmap_cache_context_set(m, context, w);
+
+ v = m->windows + w;
+ *ret = (uint8_t*) v->ptr + (offset - v->offset);
+ return 1;
+}
+
+int mmap_cache_get(
+ MMapCache *m,
+ int fd,
+ int prot,
+ unsigned context,
+ uint64_t offset,
+ uint64_t size,
+ void **ret) {
+
+ unsigned fd_index;
+ int r;
+
+ assert(m);
+ assert(fd >= 0);
+ assert(context < m->contexts_max);
+ assert(size > 0);
+ assert(ret);
+
+ /* Maybe the current pointer for this context is already the
+ * right one? */
+ r = mmap_cache_current(m, fd, context, offset, size, ret);
+ if (r != 0)
+ return r;
+
+ /* OK, let's find the chain for this FD */
+ r = mmap_cache_get_fd_index(m, fd, &fd_index);
+ if (r < 0)
+ return r;
+
+ /* And let's look through the available mmaps */
+ r = mmap_cache_find(m, fd_index, context, offset, size, ret);
+ if (r != 0)
+ return r;
+
+ /* Not found? Then, let's add it */
+ return mmap_cache_put(m, fd, fd_index, prot, context, offset, size, ret);
+}
+
+void mmap_cache_close_fd(MMapCache *m, int fd) {
+ FileDescriptor *j;
+ unsigned fd_index, c, w;
+
+ assert(m);
+ assert(fd > 0);
+
+ j = bsearch(&fd, m->by_fd, m->n_fds, sizeof(m->by_fd[0]), fd_cmp);
+ if (!j)
+ return;
+ fd_index = (unsigned) (j - m->by_fd);
+
+ for (c = 0; c < m->contexts_max; c++) {
+ w = m->by_context[c];
+ if (w == (unsigned) -1)
+ continue;
+
+ if (m->windows[w].fd == fd)
+ mmap_cache_context_unset(m, c);
+ }
+
+ w = m->by_fd[fd_index].windows;
+ while (w != (unsigned) -1) {
+
+ mmap_cache_fd_remove(m, fd_index, w);
+ mmap_cache_window_unmap(m, w);
+
+ w = m->by_fd[fd_index].windows;
+ }
+
+ memmove(m->by_fd + fd_index, m->by_fd + fd_index + 1, (m->n_fds - (fd_index + 1)) * sizeof(FileDescriptor));
+ m->n_fds --;
+}
+
+void mmap_cache_close_context(MMapCache *m, unsigned context) {
+ mmap_cache_context_unset(m, context);
+}
diff --git a/src/journal/mmap-cache.h b/src/journal/mmap-cache.h
new file mode 100644
index 000000000..0a88fc584
--- /dev/null
+++ b/src/journal/mmap-cache.h
@@ -0,0 +1,34 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <inttypes.h>
+
+typedef struct MMapCache MMapCache;
+
+MMapCache* mmap_cache_new(unsigned contexts_max, unsigned fds_max);
+MMapCache* mmap_cache_ref(MMapCache *m);
+MMapCache* mmap_cache_unref(MMapCache *m);
+
+int mmap_cache_get(MMapCache *m, int fd, int prot, unsigned context, uint64_t offset, uint64_t size, void **ret);
+void mmap_cache_close_fd(MMapCache *m, int fd);
+void mmap_cache_close_context(MMapCache *m, unsigned context);
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 359a7cac3..41526b35b 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1118,7 +1118,7 @@ static int add_file(sd_journal *j, const char *prefix, const char *filename) {
return 0;
}
- r = journal_file_open(path, O_RDONLY, 0, false, false, NULL, NULL, &f);
+ r = journal_file_open(path, O_RDONLY, 0, false, false, NULL, j->mmap, NULL, &f);
free(path);
if (r < 0) {
@@ -1439,6 +1439,17 @@ static sd_journal *journal_new(int flags, const char *path) {
return NULL;
}
+ /* One context for each type, plus the zeroth catchall
+ * context. One fd for each file plus one for each type, which
+ * is need when verifying things */
+ j->mmap = mmap_cache_new(_OBJECT_TYPE_MAX, JOURNAL_FILES_MAX + _OBJECT_TYPE_MAX);
+ if (!j->mmap) {
+ hashmap_free(j->files);
+ hashmap_free(j->directories_by_path);
+ free(j->path);
+ free(j);
+ }
+
return j;
}
@@ -1527,6 +1538,9 @@ _public_ void sd_journal_close(sd_journal *j) {
sd_journal_flush_matches(j);
+ if (j->mmap)
+ mmap_cache_unref(j->mmap);
+
free(j->path);
free(j);
}
diff --git a/src/journal/test-journal-stream.c b/src/journal/test-journal-stream.c
index 0925995fc..707dcc178 100644
--- a/src/journal/test-journal-stream.c
+++ b/src/journal/test-journal-stream.c
@@ -79,9 +79,9 @@ int main(int argc, char *argv[]) {
assert_se(mkdtemp(t));
assert_se(chdir(t) >= 0);
- assert_se(journal_file_open("one.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, &one) == 0);
- assert_se(journal_file_open("two.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, &two) == 0);
- assert_se(journal_file_open("three.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, &three) == 0);
+ assert_se(journal_file_open("one.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, NULL, &one) == 0);
+ assert_se(journal_file_open("two.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, NULL, &two) == 0);
+ assert_se(journal_file_open("three.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, NULL, &three) == 0);
for (i = 0; i < N_ENTRIES; i++) {
char *p, *q;
diff --git a/src/journal/test-journal.c b/src/journal/test-journal.c
index 8f01b4d82..2fd19a755 100644
--- a/src/journal/test-journal.c
+++ b/src/journal/test-journal.c
@@ -41,7 +41,7 @@ int main(int argc, char *argv[]) {
assert_se(mkdtemp(t));
assert_se(chdir(t) >= 0);
- assert_se(journal_file_open("test.journal", O_RDWR|O_CREAT, 0666, true, false, NULL, NULL, &f) == 0);
+ assert_se(journal_file_open("test.journal", O_RDWR|O_CREAT, 0666, true, true, NULL, NULL, NULL, &f) == 0);
dual_timestamp_get(&ts);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 04:22:23 +0000