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Overview
| Comment: | In the winMremap VFS function, unmap the region prior to attempting to truncate the file. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | experimental-mmap |
| Files: | files | file ages | folders |
| SHA1: |
8870c4cc6cda07154936644f7df25bd8 |
| User & Date: | mistachkin 2013-03-23 12:15:27 |
Context
|
2013-03-23
| ||
| 14:20 | Fix a case where a checkpoint operation could write to an invalid part of a memory mapped region. check-in: 8dbe89d0 user: dan tags: experimental-mmap | |
| 12:15 | In the winMremap VFS function, unmap the region prior to attempting to truncate the file. check-in: 8870c4cc user: mistachkin tags: experimental-mmap | |
| 10:09 | Do not unmap the mapped file region in winTruncate as there may be outstanding pointers to it. check-in: f57a9c91 user: mistachkin tags: experimental-mmap | |
Changes
Changes to src/os_win.c.
3556 3556 ** mapping (nNew bytes) may be greater than the size of the database file. 3557 3557 ** If this is the case, extend the file on disk using ftruncate(). */ 3558 3558 assert( nNewRnd>0 || (flags & SQLITE_MREMAP_EXTEND)==0 ); 3559 3559 if( flags & SQLITE_MREMAP_EXTEND ){ 3560 3560 sqlite3_int64 oldSz; 3561 3561 rc = winFileSize(id, &oldSz); 3562 3562 if( rc==SQLITE_OK && nNewRnd>oldSz ){ 3563 - rc = winTruncate(id, nNewRnd); 3563 + rc = winUnmap(id); /* Cannot truncate the file with an open mapping. */ 3564 + if( rc==SQLITE_OK ){ 3565 + rc = winTruncate(id, nNewRnd); 3566 + } 3564 3567 } 3565 3568 if( rc!=SQLITE_OK ) return rc; 3566 3569 } 3567 3570 3568 3571 /* If we get this far, unmap any old mapping. */ 3569 3572 rc = winUnmap(id); 3570 3573 if( rc!=SQLITE_OK ) return rc;