On 11 Feb 2003, Sergey Suleymanov wrote: > >>>>> Bart Oldeman writes: > > Bart> But Windows locking and Linux locking techniques are > Bart> incompatible so translating them through smbfs transforms > Bart> information. > > Do you know how Samba server's _posix_ locking consist with > Dosemu's one? I mean, is samba's mapping SMB locks to posix > locks compatible enough to dosemu's emulation?
it used to be a similar mapping for byte range locks (code lifted from samba). locking was reworked for samba 2.2 however. There are some files you can browse here: http://samba.org/cgi-bin/cvsweb/samba/source/locking/ and also http://samba.org/cgi-bin/cvsweb/samba/source/smbd/open.c and there's a very complicated function there now which requires ASCII art to understand. Hmm. as for file locking, Samba appears to maintain a database of what mode the clients use -- that's possible since it's a server; multiple DOSEMU instances don't share this information. Also Samba always tries to open files r/w on the server whereas DOSEMU MFS opens them r/o if DOS opens a file r/o. This works around the problem that exclusive POSIX locks cannot be applied to r/o-opened files. This technique could be used by DOSEMU too (DOS apps still think their open is r/o and MFS can stop writes) but I'm not sure if it's a good idea... Bart - To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
