Messages in this thread | | | Date | Fri, 1 Sep 2006 09:42:34 +0200 (MEST) | From | Jan Engelhardt <> | Subject | Re: [PATCH 01/22][RFC] Unionfs: Documentation |
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Hi,
nice to see that unionfs finally tries to get in :)
>+Whiteouts: >+========== >+ >+A whiteout removes a file name from the name-space. Whiteouts are needed when >+one attempts to remove a file on a read-only branch.
"namespace".
>+Suppose we have a two branch union, where branch 0 is read-write and branch 1
I'd go for "two-branch".
>+Copyup: >+======= >+ >+When a change is made to the contents of a file's data or meta-data, they >+have to be stored somewhere. The best way is to create a copy of the >+original file on a branch that is writable, and then redirect the write >+though to this copy. The copy must be made on a higher priority branch so >+that lookup & readdir return this newer "version" of the file rather than >+the original (see duplicate elimination).
Apropos copyup, sparse copyup would probably a nice feature in future, but it also has its effects.
>--- linux-2.6-git/Documentation/filesystems/unionfs/usage.txt 1969-12-31 19:00:00.000000000 -0500 >+++ linux-2.6-git-unionfs/Documentation/filesystems/unionfs/usage.txt 2006-08-31 19:25:19.000000000 -0400 >+ >+mount -t unionfs -o branch-option[,union-options[,...]] none unionfs
should read mount -t unionfs -o branch-option[,union-options[,...]] none MOUNTPOINT
>+KNOWN ISSUES: >+============= >+ >+The NFS server returns -EACCES for read-only exports, instead of -EROFS. This
Will the NFS code ever be changed to return EROFS instead?
>+nfs-mouted branch.
mounted
>+Modifying a Unionfs branch directly, while the union is mounted is currently >+unsupported. Any such change can cause Unionfs to oops, however it could even >+BRESULT IN DATA LOSS.
RESULT
Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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