Folks, I've been made aware of an unfortunate bug in vfsfruit that causes it to use the wrong xattr name netatalk.Metadata instead of the intended org.netatalk.Metadata on FreeBSD (remember, this is FreeBSD, so no namespace prefix in the xattr name, see below.). This affects the default vfsfruit setting 'fruit:metadata=netatalk' which is meant to result in a config where Samba and Netatalk use the same xattrs for the Mac related stuff. Netatalk of course uses (again, FreeBSD, no namespace prefix) org.netatalk.Metadata As a result Samba and Netatlk are.not. using the same xattr.:/ The bug is FreeBSD only as I had put this little piece of insanity in vfsfruit.c: #define NETATALKMETAXATTR 'org.netatalk.Metadata' #if defined(HAVEATTROPEN) defined(FREEBSD) #define AFPINFOEANETATALK NETATALKMETAXATTR #else #define AFPINFOEANETATALK 'user.' NETATALKMETAXATTR #endif I had added this back at the time, because the FreeBSD xattr API doesn't put a namespace prefix into the xattr name, it uses a seperate int arg to specify that.
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- Vfs_fruit Uses Wrong Xattr Name For Machine
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I faintly remember I actually tested this on FreeBSD back then. Now unfortunately in libreplace we assume that the caller prefixed the xattr name with a namespace string, and in the case of FreeBSD we then chop it of and convert it to the required int arg. Fwiw, I belief we get this wrong on Solaris where we don't strip of the namespace prefix (which we should imo, Solaris doesn't use namespaces at all) but now it's probably too late to change it). I'm trying to think of the best way to fix this mess. We can't simply change the xattr name we use, as that would break existing installations. So, what are the options?
I guess the only sane fix is to change the xattr name and add conversion code that renames it on-access. The conversion code is required to be called at least in the list xattr VFS functions and in the getters. The on-access conversion would be configurable via a boolean option (so on/off), we would enable it by default for 4.6 and then possibly disable it by default for 4.7 (to get rid of the performance impact in the long run).
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Hi Evan, On Sun, Jan 22, 2017 at 06:48:03AM +0800, Evan Champion wrote: Another way would be to change the default xattr name in 4.6.0 and provide a conversion tool. The issue that I see with converting on the fly is that it will only convert the files when accessed. On the basis that this is less than 100% of files in the share, the filesystem will be left in some sort of halfway fixed state that still needs to be fixed properly. So, converting on the fly with the intent to remove this conversion in a future version doesn't really solve the long-term problem and in some sense makes it a bit worse (the xattrs would be inconsistently wrong vs.
Vfs_fruit Uses Wrong Xattr Name For Machine
Consistently wrong), and makes vfsfruit itself more complicated. On this basis it may be better to just fix it for 4.6.0 and provide a conversion tool for affected sites. FreeBSD-based FreeNAS 9 and 10 nightlies have corrected the xattr name already (without the conversion tool; fruit was only just added recently to FreeNAS). Oh, this is good. Unfortunately, nas4free seems to be using it a bit longer, so they would have to run the conversion tool if we go down that path.
Vfs_fruit Uses Wrong Xattr Name For Mac Download
Can someone ask the nas4free folks how they would like to see the issue addressed? From 9ccee25a6ae3f16e44a1b258ed07e2d6b0ddd5fe Mon Sep 17 00: From: Ralph Boehme Date: Sun, 12 Feb 2017 09:05:50 +0100 Subject: PATCH vfsfruit: fix resource fork xattr name Fix resource fork xattr name broken in e4d1f8354f97ab9007e4c5f7d164937bdc5cd6f1.
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Problem: We can't enable catia by itself. The gui shows that it's added, but the vfs object doesn't appear in the smb4.conf file. Background: We need to be able to use vfscatia to fix how Mac clients write dos stream names to samba. Once this is fixed, we can enable catia on Fredo's box and set the parameter: catia:mappings = 0xE3:0xF022 More Background: Macs store the following xattr on their local filesystem for files downloaded from the interenet: 'com.apple.metadata:kMDItemWhereFroms'. The OSX SMB client writes this as an ADS on SMB shares, but since ':' is an invalid character in NTFS, OSX substitutes it with the unicode private-range character '' or 0xF022. We'll use vfscatia to convert it back to ':' on the fly to store it on our servers, which will make userland tools happier.