* vfsmount_lock in __d_path() [not found] <200603041038.BCC57442.GCOSMJNFtPXSFOFTFL@I-love.SAKURA.ne.jp> @ 2006-05-31 11:14 ` Tetsuo Handa 2006-05-31 12:20 ` Al Viro 0 siblings, 1 reply; 2+ messages in thread From: Tetsuo Handa @ 2006-05-31 11:14 UTC (permalink / raw) To: linux-fsdevel Hello. I posted this message three months ago at kernelnewbies-ml, but no answer. Now reposting at fsdevel-ml. > In the function __d_path() at http://lxr.linux.no/source/fs/dcache.c#L1354 , > "vfsmnt->mnt_parent" "vfsmnt->mnt_mountpoint" "vfsmnt->mnt_parent" > are protected by spin_lock(&vfsmount_lock), while "vfsmnt->mnt_root" is not. > > In the function do_move_mount() at http://lxr.linux.no/source/fs/namespace.c#L695 , > "old_nd.mnt->mnt_root" is protected by spin_lock(&vfsmount_lock). > > Is spin_lock(&vfsmount_lock) unnecessary for referring "vfsmnt->mnt_root" ? In other words, don't we need to protect vfsmnt->mnt_root at http://lxr.linux.no/source/fs/dcache.c#L1383 using vfsmount_lock ? Regards. ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: vfsmount_lock in __d_path() 2006-05-31 11:14 ` vfsmount_lock in __d_path() Tetsuo Handa @ 2006-05-31 12:20 ` Al Viro 0 siblings, 0 replies; 2+ messages in thread From: Al Viro @ 2006-05-31 12:20 UTC (permalink / raw) To: Tetsuo Handa; +Cc: linux-fsdevel On Wed, May 31, 2006 at 08:14:22PM +0900, Tetsuo Handa wrote: > Hello. > > I posted this message three months ago at kernelnewbies-ml, but no answer. > Now reposting at fsdevel-ml. ->mnt_root is assigned once and that happens before vfsmount can be found anywhere. ^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <200603041038.BCC57442.GCOSMJNFtPXSFOFTFL@I-love.SAKURA.ne.jp>
2006-05-31 11:14 ` vfsmount_lock in __d_path() Tetsuo Handa
2006-05-31 12:20 ` Al Viro
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