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Improve MDB error handling, drop seek calls.

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Catch I/O errors. Do nothing between OS call failure and ErrCode().
Do not use errno after non-OS-errors like write() >= 0, which could
give a failure return of success (errno 0) or some irrelevant error
code.  Drop seek calls, use pwrite/pread/Windows OVERLAPPED offset.
vmware
Hallvard Furuseth 12 years ago
parent a5701cf2fe
commit d6d2638acc
1 changed files with 56 additions and 50 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 106
      libraries/liblmdb/mdb.c

106
libraries/liblmdb/mdb.c
Unescape View File

@ -160,7 +160,7 @@
#define MDB_MSYNC(addr,len,flags) (!FlushViewOfFile(addr,len))
#define ErrCode() GetLastError()
#define GET_PAGESIZE(x) {SYSTEM_INFO si; GetSystemInfo(&si); (x) = si.dwPageSize;}
#define close(fd) CloseHandle(fd)
#define close(fd) (CloseHandle(fd) ? 0 : -1)
#define munmap(ptr,len) UnmapViewOfFile(ptr)
#else
@ -2263,13 +2263,22 @@ mdb_page_flush(MDB_txn *txn)
if (pos != next_pos || n == MDB_COMMIT_PAGES) {
if (n) {
/* Write previous page(s) */
lseek(env->me_fd, wpos, SEEK_SET);
#ifdef HAVE_PWRITEV
wres = pwritev(env->me_fd, iov, n, wpos);
#else
if (lseek(env->me_fd, wpos, SEEK_SET) < 0) {
rc = ErrCode();
DPRINTF("lseek: %s", strerror(rc));
return rc;
}
wres = writev(env->me_fd, iov, n);
#endif
if (wres != wsize) {
rc = ErrCode();
if (wres < 0) {
rc = ErrCode();
DPRINTF("writev: %s", strerror(rc));
} else {
rc = EIO; /* TODO: Use which error code? */
DPUTS("short write, filesystem full?");
}
return rc;
@ -2474,27 +2483,28 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
MDB_pagebuf pbuf;
MDB_page *p;
MDB_meta *m;
int i, rc, err;
int i, rc, off;
/* We don't know the page size yet, so use a minimum value.
* Read both meta pages so we can use the latest one.
*/
for (i=0; i<2; i++) {
for (i=off=0; i<2; i++, off = meta->mm_psize) {
#ifdef _WIN32
if (!ReadFile(env->me_fd, &pbuf, MDB_PAGESIZE, (DWORD *)&rc, NULL) || rc == 0)
DWORD len;
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
ov.Offset = off;
rc = ReadFile(env->me_fd,&pbuf,MDB_PAGESIZE,&len,&ov) ? (int)len : -1;
#else
if ((rc = read(env->me_fd, &pbuf, MDB_PAGESIZE)) == 0)
rc = pread(env->me_fd, &pbuf, MDB_PAGESIZE, off);
#endif
{
return ENOENT;
}
else if (rc != MDB_PAGESIZE) {
err = ErrCode();
if (rc > 0)
err = MDB_INVALID;
DPRINTF("read: %s", strerror(err));
return err;
if (rc != MDB_PAGESIZE) {
if (rc == 0 && off == 0)
return ENOENT;
rc = rc < 0 ? (int) ErrCode() : MDB_INVALID;
DPRINTF("read: %s", mdb_strerror(rc));
return rc;
}
p = (MDB_page *)&pbuf;
@ -2516,18 +2526,8 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
return MDB_VERSION_MISMATCH;
}
if (i) {
if (m->mm_txnid > meta->mm_txnid)
memcpy(meta, m, sizeof(*m));
} else {
if (off == 0 || m->mm_txnid > meta->mm_txnid)
memcpy(meta, m, sizeof(*m));
#ifdef _WIN32
if (SetFilePointer(env->me_fd, meta->mm_psize, NULL, FILE_BEGIN) != meta->mm_psize)
#else
if (lseek(env->me_fd, meta->mm_psize, SEEK_SET) != meta->mm_psize)
#endif
return ErrCode();
}
}
return 0;
}
@ -2577,14 +2577,14 @@ mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
#ifdef _WIN32
{
DWORD len;
SetFilePointer(env->me_fd, 0, NULL, FILE_BEGIN);
rc = WriteFile(env->me_fd, p, psize * 2, &len, NULL);
rc = (len == psize * 2) ? MDB_SUCCESS : ErrCode();
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
rc = WriteFile(env->me_fd, p, psize * 2, &len, &ov);
rc = rc ? (len == psize * 2 ? MDB_SUCCESS : EIO) : ErrCode();
}
#else
lseek(env->me_fd, 0, SEEK_SET);
rc = write(env->me_fd, p, psize * 2);
rc = (rc == (int)psize * 2) ? MDB_SUCCESS : ErrCode();
rc = pwrite(env->me_fd, p, psize * 2, 0);
rc = (rc == (int)psize * 2) ? MDB_SUCCESS : rc < 0 ? ErrCode() : EIO;
#endif
free(p);
return rc;
@ -2669,13 +2669,14 @@ mdb_env_write_meta(MDB_txn *txn)
{
memset(&ov, 0, sizeof(ov));
ov.Offset = off;
WriteFile(mfd, ptr, len, (DWORD *)&rc, &ov);
if (!WriteFile(mfd, ptr, len, (DWORD *)&rc, &ov))
rc = -1;
}
#else
rc = pwrite(mfd, ptr, len, off);
#endif
if (rc != len) {
rc = ErrCode();
rc = rc < 0 ? ErrCode() : EIO;
DPUTS("write failed, disk error?");
/* On a failure, the pagecache still contains the new data.
* Write some old data back, to prevent it from being used.
@ -2815,6 +2816,7 @@ mdb_env_open2(MDB_env *env)
#ifdef _WIN32
{
int rc;
HANDLE mh;
LONG sizelo, sizehi;
sizelo = env->me_mapsize & 0xffffffff;
@ -2836,9 +2838,10 @@ mdb_env_open2(MDB_env *env)
env->me_map = MapViewOfFileEx(mh, flags & MDB_WRITEMAP ?
FILE_MAP_WRITE : FILE_MAP_READ,
0, 0, env->me_mapsize, meta.mm_address);
rc = env->me_map ? 0 : ErrCode();
CloseHandle(mh);
if (!env->me_map)
return ErrCode();
if (rc)
return rc;
}
#else
i = MAP_SHARED;
@ -3207,12 +3210,14 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
size = GetFileSize(env->me_lfd, NULL);
#else
size = lseek(env->me_lfd, 0, SEEK_END);
if (size == -1) goto fail_errno;
#endif
rsize = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
if (size < rsize && *excl > 0) {
#ifdef _WIN32
SetFilePointer(env->me_lfd, rsize, NULL, 0);
if (!SetEndOfFile(env->me_lfd)) goto fail_errno;
if (SetFilePointer(env->me_lfd, rsize, NULL, FILE_BEGIN) != rsize
|| !SetEndOfFile(env->me_lfd))
goto fail_errno;
#else
if (ftruncate(env->me_lfd, rsize) != 0) goto fail_errno;
#endif
@ -3327,7 +3332,7 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
goto fail;
}
rc = ErrCode();
if (rc != EACCES && rc != EAGAIN) {
if (rc && rc != EACCES && rc != EAGAIN) {
goto fail;
}
#ifdef _WIN32
@ -3510,9 +3515,9 @@ mdb_env_close0(MDB_env *env, int excl)
munmap(env->me_map, env->me_mapsize);
}
if (env->me_mfd != env->me_fd && env->me_mfd != INVALID_HANDLE_VALUE)
close(env->me_mfd);
(void) close(env->me_mfd);
if (env->me_fd != INVALID_HANDLE_VALUE)
close(env->me_fd);
(void) close(env->me_fd);
if (env->me_txns) {
pid_t pid = env->me_pid;
/* Clearing readers is done in this function because
@ -3556,7 +3561,7 @@ mdb_env_close0(MDB_env *env, int excl)
UnlockFile(env->me_lfd, 0, 0, 1, 0);
}
#endif
close(env->me_lfd);
(void) close(env->me_lfd);
}
env->me_flags &= ~(MDB_ENV_ACTIVE|MDB_ENV_TXKEY);
@ -3596,11 +3601,11 @@ mdb_env_copyfd(MDB_env *env, HANDLE fd)
{
DWORD len;
rc = WriteFile(fd, env->me_map, wsize, &len, NULL);
rc = (len == wsize) ? MDB_SUCCESS : ErrCode();
rc = rc ? (len == wsize ? MDB_SUCCESS : EIO) : ErrCode();
}
#else
rc = write(fd, env->me_map, wsize);
rc = (rc == (int)wsize) ? MDB_SUCCESS : ErrCode();
rc = rc == (int)wsize ? MDB_SUCCESS : rc < 0 ? ErrCode() : EIO;
#endif
if (env->me_txns)
UNLOCK_MUTEX_W(env);
@ -3619,7 +3624,7 @@ mdb_env_copyfd(MDB_env *env, HANDLE fd)
else
w2 = wsize;
rc = WriteFile(fd, ptr, w2, &len, NULL);
rc = (len == w2) ? MDB_SUCCESS : ErrCode();
rc = rc ? (len == w2 ? MDB_SUCCESS : EIO) : ErrCode();
if (rc) break;
wsize -= w2;
ptr += w2;
@ -3633,7 +3638,7 @@ mdb_env_copyfd(MDB_env *env, HANDLE fd)
else
w2 = wsize;
wres = write(fd, ptr, w2);
rc = (wres > 0) ? MDB_SUCCESS : ErrCode();
rc = wres == (ssize_t)w2 ? MDB_SUCCESS : rc < 0 ? ErrCode() : EIO;
if (rc) break;
wsize -= wres;
ptr += wres;
@ -3677,8 +3682,6 @@ mdb_env_copy(MDB_env *env, const char *path)
#endif
, 0666);
#endif
if (!(env->me_flags & MDB_NOSUBDIR))
free(lpath);
if (newfd == INVALID_HANDLE_VALUE) {
rc = ErrCode();
goto leave;
@ -3695,8 +3698,11 @@ mdb_env_copy(MDB_env *env, const char *path)
rc = mdb_env_copyfd(env, newfd);
leave:
if (!(env->me_flags & MDB_NOSUBDIR))
free(lpath);
if (newfd != INVALID_HANDLE_VALUE)
close(newfd);
if (close(newfd) < 0 && rc == MDB_SUCCESS)
rc = ErrCode();
return rc;
}

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