A free Windows-compatible Operating System - mirrored from GitHub

cdriversgplhacktoberfestkerneloperating-systemososdevreactoswin32win32apiwindowsx86

Filip Navara a9f6cf2b6c - Change all FAT*FindAvailableCluster functions to new functions ... FAT*FindAndMarkAvailableCluster which have incorporated the setting of EOF marker in the File Allocation Table for the returned cluster. - Rewritten FAT32CountAvailableClusters, FAT32FindAndMarkAvailableCluster, FAT16CountAvailableClusters and FAT16FindAndMarkAvailableCluster for better performance. These functions were using one big loop for traversing the FAT and had a block of code in the loop for requesting cache manger for next chunk of FAT *if necessary* (which commonly wasn't the case). Now it's changed to request always a whole FAT chunk and process it at once in a nested loop. - Cache last offset + cluster pair while reading/writing from/to file. This ensures almost linear times when doing sequential reads/writes, because the whole FAT traversing for the file is not done again for every request. Previously there was code for this, but it was neither correctly used nor working. It stored the last offset + cluster pair in file CCB structure (that is unique for each opened file handle) and not FCB structure (which is shared among all instances of the same file). This resulted in inconsistent cluster + offset number when the file allocation chain was changed (eg. by enlarging/shrinking the file), but since the cached offsets weren't actully used it went unnoticed. - Remove old hack from NextCluster and fix the call to it in VfatAddEntry. Not much to say about it, there was an temporary hack in NextCluster and with fixed VfatAddEntry it's now no longer needed. - Add pointers to WriteCluster, FindAndMarkAvailableCluster and GetNextCluster functions to device extension (set during mount) and use them at appropriate locations. This avoids some nasty if's in the code and causes some unnoticable performance improvment in the low-level FAT code. - Lock the directory FCB in VfatAddEntry while modifying it. This should propably be done on more places, but it needs more investigations. - Increase the file cache allocation size in VfatRead/VfatWrite. It boosts the overall speed of the driver a lot. svn path=/trunk/; revision=10344		2004-08-01 21:57:18 +00:00
freeldr	Detect parallel ports.	2004-06-21 12:23:01 +00:00
msvc6	Initial revision	2004-02-06 08:21:52 +00:00
os2	neu	2004-01-31 01:29:11 +00:00
posix	Ignore map file.	2004-01-20 20:44:30 +00:00
reactos	- Change all FAT*FindAvailableCluster functions to new functions	2004-08-01 21:57:18 +00:00
rosapps	change to zoomin Makefile to get it compiling, and enable touch, genguid, zoomin, winemine, kill, tcat, and tlist - patch by Travis Snoozy <ai2097@yahoo.com>	2004-06-02 02:27:04 +00:00