What is the actual sequence of events from the wire perspective (the actual smb requests sent)? On Thu, Nov 3, 2011 at 6:25 PM, Anton Altaparmakov <aia21@xxxxxxxxx> wrote: > Hi, > > On 3 Nov 2011, at 17:40, Jeff Layton wrote: >> On Thu, 3 Nov 2011 15:42:13 +0000 Anton Altaparmakov <aia21@xxxxxxxxx> wrote: >>> >>> I should add that we are using iocharset=utf8 mount option which means that the dcache hash/compare functions done in the cifs module do not work because it uses nls_tolower() and nls_strnicmp() both of which for utf8 NLS in the kernel do not do anything at all and effectively behave case sensitively! >>> >>> Thus this bug/problem in all likelyhood only affects utf8 iocharset users on a case-insensitive but case-preserving CIFS server that does not support server inode numbers. >>> >>> That probably explains why it has not been noticed before! >>> >>> We need utf8 thus we still need to fix this issue. > >> I'm confused... >> >> If the filesystem being served out by the server is using utf8, then >> how is it handling the case-insensitivity? > > > The file system being served is NSS (the Netware one but now mounted on Open Enterprise Server with Linux kernel rather than actual Netware kernel). No idea how it works I am afraid. It supports lots of different namespaces as well as being case-insensitive and case preserving when using the LONG name space (which is now being served through CIFS). > > If it was NTFS or exFAT I could tell you exactly how they work (each volume has an upcase table mapping the 65536 UCS-2 Unicode characters to their upper case equivalents and each 16-bit character is upper-cased individually, more recently Windows has switched to using UTF-16 instead of UCS-2 and the upcase table changed when that happened though it remained the same size and I think for file system purposes the fact that there are surrogates in the above UCS-2 Unicode range is simply ignored)... > > Best regards, > > Anton > -- > Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) > Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK > Linux NTFS maintainer, http://www.linux-ntfs.org/ > > -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
