Jörn Engel <[EMAIL PROTECTED]> wrote: > On Fri, 4 May 2007 10:46:10 +0100, Christoph Hellwig wrote:
>> Which means the right place to fix this is samba. Samba just need >> to intersept lseek and pread/pwrite to never allocate sparse files >> but do the right thing instead. Now what the right thing would probably >> be a preallocate instead of writing zeroes, and we need to provide the >> infrastructure for them to do it, which is in progress currently. > > Why do preallocate and not just truncate the file? If it's done by samba, it's racy. Only the kernel can reliably tell a write-beyond-eof from a write-before-eof. Either it should unconditionally turn these preallocation-writes into truncates, or have a flag which will turn this feature on and which can be used to turn the lseek into a real preallocation call. I don't think unconditionally turning these writes into truncate would be good, it would change the behaviour of dd bs=1 count=$(($n*$BLOCKSIZE+1)). -- Top 100 things you don't want the sysadmin to say: 17. dd if=/dev/null of=/vmunix Friß, Spammer: [EMAIL PROTECTED] [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
