fsync() for FAT file system
sebastian.huber at embedded-brains.de
Fri May 4 14:57:22 UTC 2012
On 05/04/2012 04:51 PM, Thomas Doerfler wrote:
> if I get this code right, it actually parses each buffer of the _volume_
> and ensures it is synced, so this is FAR from optimal ;-)
If I understand the fat_get_fat_cluster() correctly it follows the chain of
clusters of the file (initial value is fat_fd->cln).
> Syncing the device will defintivly be an improvement. For large files,
> this will not be worse than syncing the file-specific buffers.
> Another area: For really "syncing" the file, would it make sense to also
> ensure that the file/directory information is updated as far as possible
> to make sure the FS contains as much information as possible to read
> back the file (in case of a device or power loss)?
It does actually this kind of operation in msdos_file_sync() (unfortunately
without a synchronization request to the cache). This should be fixed as well.
Sebastian Huber, embedded brains GmbH
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