- /*
+ /*
Unix SMB/CIFS implementation.
trivial database library
*/
if (tdb->map_ptr == MAP_FAILED) {
tdb->map_ptr = NULL;
- tdb_logerr(tdb, TDB_SUCCESS, TDB_DEBUG_WARNING,
+ tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
"tdb_mmap failed for size %lld (%s)",
(long long)tdb->map_size, strerror(errno));
}
/* check for an out of bounds access - if it is out of bounds then
see if the database has been expanded by someone else and expand
- if necessary
+ if necessary
note that "len" is the minimum length needed for the db
*/
-static int tdb_oob(struct tdb_context *tdb, tdb_off_t len, bool probe)
+static enum TDB_ERROR tdb_oob(struct tdb_context *tdb, tdb_off_t len,
+ bool probe)
{
struct stat st;
+ enum TDB_ERROR ecode;
/* We can't hold pointers during this: we could unmap! */
assert(!tdb->direct_access
return 0;
if (tdb->flags & TDB_INTERNAL) {
if (!probe) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
+ tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_oob len %lld beyond internal"
" malloc size %lld",
(long long)len,
(long long)tdb->map_size);
}
- return -1;
+ return TDB_ERR_IO;
}
- if (tdb_lock_expand(tdb, F_RDLCK) != 0)
- return -1;
+ ecode = tdb_lock_expand(tdb, F_RDLCK);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
+ }
if (fstat(tdb->fd, &st) != 0) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
+ tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"Failed to fstat file: %s", strerror(errno));
tdb_unlock_expand(tdb, F_RDLCK);
- return -1;
+ return TDB_ERR_IO;
}
tdb_unlock_expand(tdb, F_RDLCK);
if (st.st_size < (size_t)len) {
if (!probe) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
+ tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_oob len %zu beyond eof at %zu",
(size_t)len, st.st_size);
}
- return -1;
+ return TDB_ERR_IO;
}
/* Unmap, update size, remap */
tdb->map_size = st.st_size;
tdb_mmap(tdb);
- return 0;
+ return TDB_SUCCESS;
}
/* Endian conversion: we only ever deal with 8 byte quantities */
{
char buf[8192] = { 0 };
void *p = tdb->methods->direct(tdb, off, len, true);
+ enum TDB_ERROR ecode;
assert(!tdb->read_only);
if (p) {
}
while (len) {
unsigned todo = len < sizeof(buf) ? len : sizeof(buf);
- if (tdb->methods->write(tdb, off, buf, todo) == -1)
+ ecode = tdb->methods->twrite(tdb, off, buf, todo);
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
return -1;
+ }
len -= todo;
off += todo;
}
return ret;
}
-/* Even on files, we can get partial writes due to signals. */
-bool tdb_pwrite_all(int fd, const void *buf, size_t len, tdb_off_t off)
-{
- while (len) {
- ssize_t ret;
- ret = pwrite(fd, buf, len, off);
- if (ret < 0)
- return false;
- if (ret == 0) {
- errno = ENOSPC;
- return false;
- }
- buf = (char *)buf + ret;
- off += ret;
- len -= ret;
- }
- return true;
-}
-
-/* Even on files, we can get partial reads due to signals. */
-bool tdb_pread_all(int fd, void *buf, size_t len, tdb_off_t off)
-{
- while (len) {
- ssize_t ret;
- ret = pread(fd, buf, len, off);
- if (ret < 0)
- return false;
- if (ret == 0) {
- /* ETOOSHORT? */
- errno = EWOULDBLOCK;
- return false;
- }
- buf = (char *)buf + ret;
- off += ret;
- len -= ret;
- }
- return true;
-}
-
-bool tdb_read_all(int fd, void *buf, size_t len)
-{
- while (len) {
- ssize_t ret;
- ret = read(fd, buf, len);
- if (ret < 0)
- return false;
- if (ret == 0) {
- /* ETOOSHORT? */
- errno = EWOULDBLOCK;
- return false;
- }
- buf = (char *)buf + ret;
- len -= ret;
- }
- return true;
-}
-
/* write a lump of data at a specified offset */
-static int tdb_write(struct tdb_context *tdb, tdb_off_t off,
- const void *buf, tdb_len_t len)
+static enum TDB_ERROR tdb_write(struct tdb_context *tdb, tdb_off_t off,
+ const void *buf, tdb_len_t len)
{
+ enum TDB_ERROR ecode;
+
if (tdb->read_only) {
- tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_DEBUG_WARNING,
- "Write to read-only database");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_USE_ERROR,
+ "Write to read-only database");
}
/* FIXME: Bogus optimization? */
if (len == 0) {
- return 0;
+ return TDB_SUCCESS;
}
- if (tdb->methods->oob(tdb, off + len, 0) != 0)
- return -1;
+ ecode = tdb->methods->oob(tdb, off + len, 0);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
+ }
if (tdb->map_ptr) {
memcpy(off + (char *)tdb->map_ptr, buf, len);
} else {
- if (!tdb_pwrite_all(tdb->fd, buf, len, off)) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
- "tdb_write failed at %zu len=%zu (%s)",
- (size_t)off, (size_t)len, strerror(errno));
- return -1;
+ ssize_t ret;
+ ret = pwrite(tdb->fd, buf, len, off);
+ if (ret < len) {
+ /* This shouldn't happen: we avoid sparse files. */
+ if (ret >= 0)
+ errno = ENOSPC;
+
+ return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+ "tdb_write: %zi at %zu len=%zu (%s)",
+ ret, (size_t)off, (size_t)len,
+ strerror(errno));
}
}
- return 0;
+ return TDB_SUCCESS;
}
/* read a lump of data at a specified offset */
-static int tdb_read(struct tdb_context *tdb, tdb_off_t off, void *buf,
- tdb_len_t len)
+static enum TDB_ERROR tdb_read(struct tdb_context *tdb, tdb_off_t off,
+ void *buf, tdb_len_t len)
{
- if (tdb->methods->oob(tdb, off + len, 0) != 0) {
- return -1;
+ enum TDB_ERROR ecode;
+
+ ecode = tdb->methods->oob(tdb, off + len, 0);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
if (tdb->map_ptr) {
memcpy(buf, off + (char *)tdb->map_ptr, len);
} else {
- if (!tdb_pread_all(tdb->fd, buf, len, off)) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
- "tdb_read failed at %zu "
- "len=%zu (%s) map_size=%zu",
- (size_t)off, (size_t)len,
- strerror(errno),
- (size_t)tdb->map_size);
- return -1;
+ ssize_t r = pread(tdb->fd, buf, len, off);
+ if (r != len) {
+ return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+ "tdb_read failed with %zi at %zu "
+ "len=%zu (%s) map_size=%zu",
+ r, (size_t)off, (size_t)len,
+ strerror(errno),
+ (size_t)tdb->map_size);
}
}
- return 0;
+ return TDB_SUCCESS;
}
int tdb_write_convert(struct tdb_context *tdb, tdb_off_t off,
const void *rec, size_t len)
{
- int ret;
+ enum TDB_ERROR ecode;
+
if (unlikely((tdb->flags & TDB_CONVERT))) {
void *conv = malloc(len);
if (!conv) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
+ tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
"tdb_write: no memory converting"
" %zu bytes", len);
return -1;
}
memcpy(conv, rec, len);
- ret = tdb->methods->write(tdb, off,
- tdb_convert(tdb, conv, len), len);
+ ecode = tdb->methods->twrite(tdb, off,
+ tdb_convert(tdb, conv, len), len);
free(conv);
- } else
- ret = tdb->methods->write(tdb, off, rec, len);
+ } else {
+ ecode = tdb->methods->twrite(tdb, off, rec, len);
+ }
- return ret;
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return -1;
+ }
+ return 0;
}
int tdb_read_convert(struct tdb_context *tdb, tdb_off_t off,
void *rec, size_t len)
{
- int ret = tdb->methods->read(tdb, off, rec, len);
+ enum TDB_ERROR ecode = tdb->methods->tread(tdb, off, rec, len);
tdb_convert(tdb, rec, len);
- return ret;
+ if (ecode != TDB_SUCCESS) {
+ tdb->ecode = ecode;
+ return -1;
+ }
+ return 0;
}
int tdb_write_off(struct tdb_context *tdb, tdb_off_t off, tdb_off_t val)
{
if (tdb->read_only) {
- tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_DEBUG_WARNING,
+ tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_USE_ERROR,
"Write to read-only database");
return -1;
}
tdb_len_t len, unsigned int prefix)
{
void *buf;
+ enum TDB_ERROR ecode;
/* some systems don't like zero length malloc */
buf = malloc(prefix + len ? prefix + len : 1);
if (!buf) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_ERROR,
+ tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_USE_ERROR,
"tdb_alloc_read malloc failed len=%zu",
(size_t)(prefix + len));
- } else if (unlikely(tdb->methods->read(tdb, offset, buf+prefix,
- len) == -1)) {
- free(buf);
- buf = NULL;
+ } else {
+ ecode = tdb->methods->tread(tdb, offset, buf+prefix, len);
+ if (unlikely(ecode != TDB_SUCCESS)) {
+ tdb->ecode = ecode;
+ free(buf);
+ buf = NULL;
+ }
}
return buf;
}
{
while (len) {
size_t n = len > size ? size : len;
-
- if (!tdb_pwrite_all(tdb->fd, buf, n, off)) {
- tdb_logerr(tdb, TDB_ERR_IO, TDB_DEBUG_FATAL,
- "fill write failed: giving up!");
+ ssize_t ret = pwrite(tdb->fd, buf, n, off);
+ if (ret < n) {
+ if (ret >= 0)
+ errno = ENOSPC;
+
+ tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+ "fill failed: %zi at %zu len=%zu (%s)",
+ ret, (size_t)off, (size_t)len,
+ strerror(errno));
return -1;
}
len -= n;
/* expand a file. we prefer to use ftruncate, as that is what posix
says to use for mmap expansion */
-static int tdb_expand_file(struct tdb_context *tdb, tdb_len_t addition)
+static enum TDB_ERROR tdb_expand_file(struct tdb_context *tdb,
+ tdb_len_t addition)
{
char buf[8192];
if (tdb->read_only) {
- tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_DEBUG_WARNING,
- "Expand on read-only database");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_USE_ERROR,
+ "Expand on read-only database");
}
if (tdb->flags & TDB_INTERNAL) {
char *new = realloc(tdb->map_ptr, tdb->map_size + addition);
if (!new) {
- tdb_logerr(tdb, TDB_ERR_OOM, TDB_DEBUG_FATAL,
- "No memory to expand database");
- return -1;
+ return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+ "No memory to expand database");
}
tdb->map_ptr = new;
tdb->map_size += addition;
file isn't sparse, which would be very bad if we ran out of
disk. This must be done with write, not via mmap */
memset(buf, 0x43, sizeof(buf));
- if (0 || fill(tdb, buf, sizeof(buf), tdb->map_size, addition) == -1)
- return -1;
+ if (fill(tdb, buf, sizeof(buf), tdb->map_size, addition) == -1)
+ return tdb->ecode;
tdb->map_size += addition;
tdb_mmap(tdb);
}
- return 0;
+ return TDB_SUCCESS;
}
-/* This is only neded for tdb_access_commit, but used everywhere to simplify. */
-struct tdb_access_hdr {
- tdb_off_t off;
- tdb_len_t len;
- bool convert;
-};
-
const void *tdb_access_read(struct tdb_context *tdb,
tdb_off_t off, tdb_len_t len, bool convert)
{
- const void *ret = NULL;
+ const void *ret = NULL;
if (likely(!(tdb->flags & TDB_CONVERT)))
ret = tdb->methods->direct(tdb, off, len, false);
struct tdb_access_hdr *hdr;
hdr = _tdb_alloc_read(tdb, off, len, sizeof(*hdr));
if (hdr) {
+ hdr->next = tdb->access;
+ tdb->access = hdr;
ret = hdr + 1;
if (convert)
tdb_convert(tdb, (void *)ret, len);
void *ret = NULL;
if (tdb->read_only) {
- tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_DEBUG_WARNING,
+ tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_USE_ERROR,
"Write to read-only database");
return NULL;
}
struct tdb_access_hdr *hdr;
hdr = _tdb_alloc_read(tdb, off, len, sizeof(*hdr));
if (hdr) {
+ hdr->next = tdb->access;
+ tdb->access = hdr;
hdr->off = off;
hdr->len = len;
hdr->convert = convert;
return ret;
}
-bool is_direct(const struct tdb_context *tdb, const void *p)
+static struct tdb_access_hdr **find_hdr(struct tdb_context *tdb, const void *p)
{
- return (tdb->map_ptr
- && (char *)p >= (char *)tdb->map_ptr
- && (char *)p < (char *)tdb->map_ptr + tdb->map_size);
+ struct tdb_access_hdr **hp;
+
+ for (hp = &tdb->access; *hp; hp = &(*hp)->next) {
+ if (*hp + 1 == p)
+ return hp;
+ }
+ return NULL;
}
void tdb_access_release(struct tdb_context *tdb, const void *p)
{
- if (is_direct(tdb, p))
+ struct tdb_access_hdr *hdr, **hp = find_hdr(tdb, p);
+
+ if (hp) {
+ hdr = *hp;
+ *hp = hdr->next;
+ free(hdr);
+ } else
tdb->direct_access--;
- else
- free((struct tdb_access_hdr *)p - 1);
}
int tdb_access_commit(struct tdb_context *tdb, void *p)
{
+ struct tdb_access_hdr *hdr, **hp = find_hdr(tdb, p);
int ret = 0;
- if (!tdb->map_ptr
- || (char *)p < (char *)tdb->map_ptr
- || (char *)p >= (char *)tdb->map_ptr + tdb->map_size) {
- struct tdb_access_hdr *hdr;
-
- hdr = (struct tdb_access_hdr *)p - 1;
+ if (hp) {
+ hdr = *hp;
if (hdr->convert)
ret = tdb_write_convert(tdb, hdr->off, p, hdr->len);
else
ret = tdb_write(tdb, hdr->off, p, hdr->len);
+ *hp = hdr->next;
free(hdr);
} else
tdb->direct_access--;
}
static void *tdb_direct(struct tdb_context *tdb, tdb_off_t off, size_t len,
- bool write)
+ bool write_mode)
{
if (unlikely(!tdb->map_ptr))
return NULL;
- if (unlikely(tdb_oob(tdb, off + len, true) == -1))
+ if (unlikely(tdb_oob(tdb, off + len, true) != TDB_SUCCESS))
return NULL;
return (char *)tdb->map_ptr + off;
}
-void add_stat_(struct tdb_context *tdb, uint64_t *stat, size_t val)
+void add_stat_(struct tdb_context *tdb, uint64_t *s, size_t val)
{
- if ((uintptr_t)stat < (uintptr_t)tdb->stats + tdb->stats->size)
- *stat += val;
+ if ((uintptr_t)s < (uintptr_t)tdb->stats + tdb->stats->size)
+ *s += val;
}
static const struct tdb_methods io_methods = {
projects / ccan / blobdiff