Date: Mon, 13 Apr 2009 16:30:25 -0400 From: John Baldwin <jhb@freebsd.org> To: Tim Kientzle <kientzle@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r189967 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <200904131630.25715.jhb@freebsd.org> In-Reply-To: <49E398F2.7090604@freebsd.org> References: <200903181619.n2IGJifl031031@svn.freebsd.org> <200903181406.32619.jhb@freebsd.org> <49E398F2.7090604@freebsd.org>
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On Monday 13 April 2009 3:56:34 pm Tim Kientzle wrote: > John Baldwin wrote: > > On Wednesday 18 March 2009 12:19:44 pm John Baldwin wrote: > >> Author: jhb > >> Date: Wed Mar 18 16:19:44 2009 > >> New Revision: 189967 > >> URL: http://svn.freebsd.org/changeset/base/189967 > >> > >> Log: > >> The zfs_get_xattrdir() function is used to find the extended attribute > >> directory for a znode. When the directory already exists, it returns a > >> referenced but unlocked vnode. When a directory does not yet exist, it > >> calls zfs_make_xattrdir() to create a new one. zfs_make_xattrdir() returns > >> the vnode both referenced and and locked and zfs_get_xattrdir() was leaking > >> this vnode lock to its callers. Fix this by dropping the vnode lock if > >> zfs_make_xattrdir() successfully creates a new extended attribute > >> directory. > > > > This should fix the panics with ZFS and tar + EA. > > Thanks. > > One point I'm curious about. This problem was > originally triggered by calls to extattr_list_fd(). > This seems to imply that any call to extattr_list_fd() > will allocate an extended attribute directory if it > doesn't already exist. > > This is surprising. It also raises questions about > both performance (tar now does extattr_list_fd() > for every file being archived) and operation > with read-only mounts. I'm not sure if it actually allocates space on disk or if it just allocates a virtual node to handle EA requests that only allocates disk space once it has at least one attribute to store. -- John Baldwin
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