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-rw-r--r--src/journal/journal-file.c14
-rw-r--r--src/journal/journal-verify.c5
-rw-r--r--src/journal/mmap-cache.c73
-rw-r--r--src/journal/mmap-cache.h3
4 files changed, 35 insertions, 60 deletions
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index f01f12496c..79f759897a 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -311,8 +311,6 @@ static int journal_file_allocate(JournalFile *f, uint64_t offset, uint64_t size)
if (r != 0)
return -r;
- mmap_cache_close_fd_range(f->mmap, f->fd, old_size);
-
if (fstat(f->fd, &f->last_stat) < 0)
return -errno;
@@ -321,7 +319,7 @@ static int journal_file_allocate(JournalFile *f, uint64_t offset, uint64_t size)
return 0;
}
-static int journal_file_move_to(JournalFile *f, int context, uint64_t offset, uint64_t size, void **ret) {
+static int journal_file_move_to(JournalFile *f, int context, bool keep_always, uint64_t offset, uint64_t size, void **ret) {
assert(f);
assert(ret);
@@ -335,7 +333,7 @@ static int journal_file_move_to(JournalFile *f, int context, uint64_t offset, ui
return -EADDRNOTAVAIL;
}
- return mmap_cache_get(f->mmap, f->fd, f->prot, context, offset, size, ret);
+ return mmap_cache_get(f->mmap, f->fd, f->prot, context, keep_always, offset, size, &f->last_stat, ret);
}
static uint64_t minimum_header_size(Object *o) {
@@ -373,7 +371,7 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec
/* 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);
+ r = journal_file_move_to(f, context, false, offset, sizeof(ObjectHeader), &t);
if (r < 0)
return r;
@@ -393,7 +391,7 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec
return -EBADMSG;
if (s > sizeof(ObjectHeader)) {
- r = journal_file_move_to(f, o->object.type, offset, s, &t);
+ r = journal_file_move_to(f, o->object.type, false, offset, s, &t);
if (r < 0)
return r;
@@ -457,7 +455,7 @@ int journal_file_append_object(JournalFile *f, int type, uint64_t size, Object *
if (r < 0)
return r;
- r = journal_file_move_to(f, type, p, size, &t);
+ r = journal_file_move_to(f, type, false, p, size, &t);
if (r < 0)
return r;
@@ -544,6 +542,7 @@ static int journal_file_map_data_hash_table(JournalFile *f) {
r = journal_file_move_to(f,
OBJECT_DATA_HASH_TABLE,
+ true,
p, s,
&t);
if (r < 0)
@@ -565,6 +564,7 @@ static int journal_file_map_field_hash_table(JournalFile *f) {
r = journal_file_move_to(f,
OBJECT_FIELD_HASH_TABLE,
+ true,
p, s,
&t);
if (r < 0)
diff --git a/src/journal/journal-verify.c b/src/journal/journal-verify.c
index 90739a66c2..9156fd5dc0 100644
--- a/src/journal/journal-verify.c
+++ b/src/journal/journal-verify.c
@@ -249,7 +249,7 @@ static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
c = (a + b) / 2;
- r = mmap_cache_get(m, fd, PROT_READ|PROT_WRITE, 0, c * sizeof(uint64_t), sizeof(uint64_t), (void **) &z);
+ r = mmap_cache_get(m, fd, PROT_READ|PROT_WRITE, 0, false, c * sizeof(uint64_t), sizeof(uint64_t), NULL, (void **) &z);
if (r < 0)
return r;
@@ -261,9 +261,8 @@ static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
if (p < *z)
b = c;
- else {
+ else
a = c;
- }
}
return 0;
diff --git a/src/journal/mmap-cache.c b/src/journal/mmap-cache.c
index 69efb20ade..2b45e375c5 100644
--- a/src/journal/mmap-cache.c
+++ b/src/journal/mmap-cache.c
@@ -336,6 +336,7 @@ static int mmap_cache_make_room(MMapCache *m) {
Window *v;
v = m->windows + w;
+ assert(v->n_ref == 0);
if (v->ptr) {
mmap_cache_window_unmap(m, w);
@@ -354,8 +355,10 @@ static int mmap_cache_put(
unsigned fd_index,
int prot,
unsigned context,
+ bool keep_always,
uint64_t offset,
uint64_t size,
+ struct stat *st,
void **ret) {
unsigned w;
@@ -387,6 +390,18 @@ static int mmap_cache_put(
wsize = WINDOW_SIZE;
}
+ if (st) {
+ /* Memory maps that are larger then the files
+ underneath have undefined behaviour. Hence, clamp
+ things to the file size if we know it */
+
+ if (woffset >= (uint64_t) st->st_size)
+ return -EADDRNOTAVAIL;
+
+ if (woffset + wsize > (uint64_t) st->st_size)
+ wsize = PAGE_ALIGN(st->st_size - woffset);
+ }
+
for (;;) {
d = mmap(NULL, wsize, prot, MAP_SHARED, fd, woffset);
if (d != MAP_FAILED)
@@ -413,8 +428,13 @@ static int mmap_cache_put(
v->offset = woffset;
v->size = wsize;
- v->n_ref = 0;
- mmap_cache_window_add_lru(m, w);
+ if (keep_always)
+ v->n_ref = 1;
+ else {
+ v->n_ref = 0;
+ mmap_cache_window_add_lru(m, w);
+ }
+
mmap_cache_fd_add(m, fd_index, w);
mmap_cache_context_set(m, context, w);
@@ -581,8 +601,10 @@ int mmap_cache_get(
int fd,
int prot,
unsigned context,
+ bool keep_always,
uint64_t offset,
uint64_t size,
+ struct stat *st,
void **ret) {
unsigned fd_index;
@@ -638,7 +660,7 @@ int mmap_cache_get(
return r;
/* Not found? Then, let's add it */
- return mmap_cache_put(m, fd, fd_index, prot, context, offset, size, ret);
+ return mmap_cache_put(m, fd, fd_index, prot, context, keep_always, offset, size, st, ret);
}
void mmap_cache_close_fd(MMapCache *m, int fd) {
@@ -679,51 +701,6 @@ void mmap_cache_close_fd(MMapCache *m, int fd) {
m->n_fds --;
}
-void mmap_cache_close_fd_range(MMapCache *m, int fd, uint64_t p) {
- unsigned fd_index, c, w;
- int r;
-
- assert(m);
- assert(fd > 0);
-
- /* This drops all windows that include space right of the
- * specified offset. This is useful to ensure that after the
- * file size is extended we drop our mappings of the end and
- * create it anew, since otherwise it is undefined whether
- * mapping will continue to work as intended. */
-
- r = mmap_cache_peek_fd_index(m, fd, &fd_index);
- if (r <= 0)
- return;
-
- for (c = 0; c < m->contexts_max; c++) {
- w = m->by_context[c];
-
- if (w != (unsigned) -1 && m->windows[w].fd == fd)
- mmap_cache_context_unset(m, c);
- }
-
- w = m->by_fd[fd_index].windows;
- while (w != (unsigned) -1) {
- Window *v;
-
- v = m->windows + w;
- assert(v->fd == fd);
- assert(v->by_fd_next == (unsigned) -1 ||
- m->windows[v->by_fd_next].fd == fd);
-
- if (v->offset + v->size > p) {
-
- mmap_cache_window_unmap(m, w);
- mmap_cache_fd_remove(m, fd_index, w);
- v->fd = -1;
-
- w = m->by_fd[fd_index].windows;
- } else
- w = v->by_fd_next;
- }
-}
-
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
index aae4544357..98a1a731f8 100644
--- a/src/journal/mmap-cache.h
+++ b/src/journal/mmap-cache.h
@@ -29,7 +29,6 @@ MMapCache* mmap_cache_new(void);
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);
+int mmap_cache_get(MMapCache *m, int fd, int prot, unsigned context, bool keep_always, uint64_t offset, uint64_t size, struct stat *st, void **ret);
void mmap_cache_close_fd(MMapCache *m, int fd);
-void mmap_cache_close_fd_range(MMapCache *m, int fd, uint64_t range);
void mmap_cache_close_context(MMapCache *m, unsigned context);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-22 03:53:38 +0000