Messages in this thread |  | | Date | Mon, 26 Aug 2002 12:54:06 +0100 | From | Christoph Hellwig <> | Subject | Re: Linux 2.4.20-pre4-ac2 |
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On Mon, Aug 26, 2002 at 06:35:04AM -0400, Alan Cox wrote: > o Khttpd race fixes (Dan Kegel)
This includes some wrong documentation updates:
+ kHTTPd is *not* currently compatible with tmpfs. Trying to serve + files stored on a tmpfs partition is known to cause kernel oopses + as of 2.4.18. This is due to the same problem that prevents sendfile() + from being usable with tmpfs. A tmpfs patch is floating around that seems + to fix this, but has not been released as of 27 May 2002. + kHTTPD does work fine with ramfs, though.
This is _not_ a problem with tmpfs, but with khttpd. The same problem is also present with nay filesystem that uses the pagecache but not generic_file_read or a non-trivial wrapper around generic_file_read, such as smbfs, ncpff, nfs, (open-)gfs, or xfs. This might not always mean those filesystems don't work at all with khttpd, but at least it opens race conditions. khttpd uses do_generic_file_read directly instead of using a file operation, and the problem is that do_generic_file_read should never have been exported to allow such a layering violation. sendfile() and the loop driver have the same issue. In 2.5 of those only the loop issue is still existant, and I plan to fix that one and make do_generic_file_read static.
+ There is debate about whether to remove kHTTPd from the main + kernel sources. This will probably happen in the 2.5 kernel series, + after which khttpd will still be available as a patch.
khttpd is gone in 2.5
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