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mdbx: refine read_header(), add MDBX_TOO_LARGE.

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Change-Id: I25b9bb2e3817993d627b2b784dfa496d9ba7e7b0
This commit is contained in:
Leonid Yuriev
2017-06-05 22:45:13 +03:00
committed by Leo Yuriev
parent 61d7ea283f
commit 7e85ad82f1
2 changed files with 54 additions and 32 deletions
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4
mdbx.h
View File

@@ -414,6 +414,10 @@ typedef enum MDBX_cursor_op {
* when mdbx_cursor_put() called with MDBX_CURRENT option. */
#define MDBX_EKEYMISMATCH (-30418)
/* Database is too large for current system, i.e. could NOT be mapped into RAM.
*/
#define MDBX_TOO_LARGE (-30417)
/* Statistics for a database in the environment */
typedef struct MDBX_stat {
uint32_t ms_psize; /* Size of a database page.

82
src/mdbx.c
View File

@@ -689,6 +689,9 @@ static const char *__mdbx_strerr(int errnum) {
case MDBX_EKEYMISMATCH:
return "MDBX_EKEYMISMATCH: The given key value is mismatched to the "
"current cursor position";
case MDBX_TOO_LARGE:
return "Database is too large for current system, i.e.could NOT be mapped "
"into RAM.";
default:
return NULL;
}
@@ -3384,6 +3387,7 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
assert(offsetof(MDBX_page, mp_meta) == PAGEHDRSZ);
memset(meta, 0, sizeof(MDBX_meta));
meta->mm_datasync_sign = MDBX_DATASIGN_WEAK;
int rc = MDBX_CORRUPTED;
/* Read twice all meta pages so we can find the latest one. */
unsigned loop_limit = NUM_METAS * 2;
@@ -3402,19 +3406,19 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
unsigned retryleft = 42;
while (1) {
int rc = mdbx_pread(env->me_fd, &page, sizeof(page), offset);
if (rc != MDBX_SUCCESS) {
int err = mdbx_pread(env->me_fd, &page, sizeof(page), offset);
if (err != MDBX_SUCCESS) {
mdbx_error("read meta[%u,%u]: %i, %s", offset, (unsigned)sizeof(page),
rc, mdbx_strerror(rc));
return rc;
err, mdbx_strerror(err));
return err;
}
MDBX_page again;
rc = mdbx_pread(env->me_fd, &again, sizeof(again), offset);
if (rc != MDBX_SUCCESS) {
err = mdbx_pread(env->me_fd, &again, sizeof(again), offset);
if (err != MDBX_SUCCESS) {
mdbx_error("read meta[%u,%u]: %i, %s", offset, (unsigned)sizeof(again),
rc, mdbx_strerror(rc));
return rc;
err, mdbx_strerror(err));
return err;
}
if (memcmp(&page, &again, sizeof(page)) == 0 || --retryleft == 0)
@@ -3451,26 +3455,6 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
continue;
}
/* LY: check pagesize */
STATIC_ASSERT(MIN_PAGESIZE < MAX_PAGESIZE);
if (!is_power2(page.mp_meta.mm_psize) ||
page.mp_meta.mm_psize < MIN_PAGESIZE ||
page.mp_meta.mm_psize > MAX_PAGESIZE) {
mdbx_notice("meta[%u] has invalid pagesize %u, skip it", meta_number,
page.mp_meta.mm_psize);
continue;
}
/* LY: check mapsize limits */
STATIC_ASSERT(MAX_MAPSIZE < SSIZE_MAX - MAX_PAGESIZE);
STATIC_ASSERT(MIN_MAPSIZE < MAX_MAPSIZE);
if (page.mp_meta.mm_mapsize < MIN_MAPSIZE ||
page.mp_meta.mm_mapsize > MAX_MAPSIZE) {
mdbx_notice("meta[%u] has invalid mapsize %" PRIu64 ", skip it",
meta_number, page.mp_meta.mm_mapsize);
continue;
}
/* LY: check signature as a checksum */
if (META_IS_STEADY(&page.mp_meta) &&
page.mp_meta.mm_datasync_sign != mdbx_meta_sign(&page.mp_meta)) {
@@ -3481,6 +3465,33 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
continue;
}
/* LY: check pagesize */
if (!is_power2(page.mp_meta.mm_psize) ||
page.mp_meta.mm_psize < MIN_PAGESIZE ||
page.mp_meta.mm_psize > MAX_PAGESIZE) {
mdbx_notice("meta[%u] has invalid pagesize %u, skip it", meta_number,
page.mp_meta.mm_psize);
rc = MDBX_VERSION_MISMATCH;
continue;
}
/* LY: check mapsize limits */
STATIC_ASSERT(MAX_MAPSIZE < SSIZE_MAX - MAX_PAGESIZE);
if (page.mp_meta.mm_mapsize < MIN_MAPSIZE) {
mdbx_notice("meta[%u] has invalid mapsize %" PRIu64 ", skip it",
meta_number, page.mp_meta.mm_mapsize);
rc = MDBX_VERSION_MISMATCH;
continue;
}
STATIC_ASSERT(MIN_MAPSIZE < MAX_MAPSIZE);
if (page.mp_meta.mm_mapsize > MAX_MAPSIZE) {
mdbx_notice("meta[%u] has too large mapsize %" PRIu64 ", skip it",
meta_number, page.mp_meta.mm_mapsize);
rc = MDBX_TOO_LARGE;
continue;
}
/* LY: check mapsize with given given pagesize */
if (page.mp_meta.mm_mapsize <
MIN_PAGENO * (uint64_t)page.mp_meta.mm_psize ||
@@ -3489,6 +3500,7 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
mdbx_notice("meta[%u] has invalid mapsize %" PRIu64
", with given pagesize %u, skip it",
meta_number, page.mp_meta.mm_mapsize, page.mp_meta.mm_psize);
rc = MDBX_CORRUPTED;
continue;
}
@@ -3499,6 +3511,7 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
page.mp_meta.mm_mapsize / page.mp_meta.mm_psize) {
mdbx_notice("meta[%u] has invalid last-pageno %" PRIaPGNO ", skip it",
meta_number, page.mp_meta.mm_last_pg);
rc = MDBX_CORRUPTED;
continue;
}
@@ -3510,12 +3523,14 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
page.mp_meta.mm_dbs[FREE_DBI].md_leaf_pages ||
page.mp_meta.mm_dbs[FREE_DBI].md_overflow_pages) {
mdbx_notice("meta[%u] has false-empty freedb, skip it", meta_number);
rc = MDBX_CORRUPTED;
continue;
}
} else if (page.mp_meta.mm_dbs[FREE_DBI].md_root >
page.mp_meta.mm_last_pg) {
mdbx_notice("meta[%u] has invalid freedb-root %" PRIaPGNO ", skip it",
meta_number, page.mp_meta.mm_dbs[FREE_DBI].md_root);
rc = MDBX_CORRUPTED;
continue;
}
@@ -3527,12 +3542,14 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
page.mp_meta.mm_dbs[MAIN_DBI].md_leaf_pages ||
page.mp_meta.mm_dbs[MAIN_DBI].md_overflow_pages) {
mdbx_notice("meta[%u] has false-empty maindb", meta_number);
rc = MDBX_CORRUPTED;
continue;
}
} else if (page.mp_meta.mm_dbs[MAIN_DBI].md_root >
page.mp_meta.mm_last_pg) {
mdbx_notice("meta[%u] has invalid maindb-root %" PRIaPGNO ", skip it",
meta_number, page.mp_meta.mm_dbs[MAIN_DBI].md_root);
rc = MDBX_CORRUPTED;
continue;
}
@@ -3545,7 +3562,7 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta) {
if (META_IS_WEAK(meta)) {
mdbx_error("no usable meta-pages, database is corrupted");
return MDBX_CORRUPTED;
return rc;
}
return MDBX_SUCCESS;
@@ -3963,6 +3980,9 @@ int __cold mdbx_env_set_mapsize(MDBX_env *env, size_t size) {
if (unlikely(env->me_signature != MDBX_ME_SIGNATURE))
return MDBX_EBADSIGN;
if (unlikely(size < MIN_MAPSIZE || size > MAX_MAPSIZE))
return MDBX_EINVAL;
if (unlikely(size < pgno2bytes(env, MIN_PAGENO)))
return MDBX_EINVAL;
@@ -3976,8 +3996,6 @@ int __cold mdbx_env_set_mapsize(MDBX_env *env, size_t size) {
/* FIXME: lock/unlock */
meta = mdbx_meta_head(env);
if (!size)
size = meta->mm_mapsize;
/* Silently round up to minimum if the size is too small */
const size_t usedsize = pgno2bytes(env, meta->mm_last_pg + 1);
if (size < usedsize)
@@ -4104,7 +4122,7 @@ static int __cold mdbx_setup_dxb(MDBX_env *env, int lck_rc) {
/* Was a mapsize configured? */
if (!env->me_mapsize || (env->me_flags & MDBX_RDONLY) ||
lck_rc != /* lck exclusive */ MDBX_RESULT_TRUE)
env->me_mapsize = meta.mm_mapsize;
env->me_mapsize = (size_t)meta.mm_mapsize;
else if (env->me_mapsize < usedsize)
env->me_mapsize = usedsize;
}