Re: [PATCH] VFS: Unlink should revoke all outstanding leases on file

[Mi Jinlong <mijinlong-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>]

Jeff Layton :
>>  /*	Check whether we can create an object with dentry child in directory
> 
> This doesn't look right to me.
> 
> The fcntl(2) manpage basically says that leases should be broken if the
> file is opened for read or write, or is truncated. unlinks don't seem
> to fall into either category...

Maybe the new one is better than before.

--------------------------------------------------------------

After client get one file's READ delegation through NFSv4,
server delete this file but don't reclaim the delegation.

This patch add break_lease at may_delete, which can reclaim delegations.

Signed-off-by: Mi Jinlong <mijinlong-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>

---
 fs/namei.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index b86b96f..0423e19 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1338,6 +1338,10 @@ static int may_delete(struct inode *dir,struct dentry *victim,int isdir)
 		return -ENOENT;
 	if (victim->d_flags & DCACHE_NFSFS_RENAMED)
 		return -EBUSY;
+
+	/* try to break leases, but no effect to delete. */
+	break_lease(victim->d_inode, FMODE_WRITE);
+
 	return 0;
 }
 
-- 
1.7.0




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