2011/11/4 Steve French <smfrench@xxxxxxxxx>: > 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. Hi. There is no upper/lower case table on nls utf8. so If you use iocharset=utf8, filesystem will be case sensitive. so we can add upper/lower case table like other charset. And Currently surrogate pair is not working on nls utf8. because it is limited by MAX_WCHAR_T in nls utf8 I think that upper/lower case table and surrogate pair support should be fixed on nls utf8. I should know Andrew's opinion to fix these problem. >>>> >>>> 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-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- 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
