From 3a77df1180acf1cbe2276a0cbe91e5d07fbf3c47 Mon Sep 17 00:00:00 2001 From: Oleg Drokin Date: Sat, 20 Aug 2016 17:34:25 -0400 Subject: [PATCH] staging/lustre: Always return EEXIST on mkdir for existing names if the name already exists, but we don't have write permissions in the parent, force talking to the MDS to determine what more sensical error code to return. This also happens to fix matlab and other such programs that assume that EEXIST is the only valid error code for mkdir of an existing directory. Signed-off-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lustre/lustre/llite/namei.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c index ee5a42e5e95d..d13debbb08b2 100644 --- a/drivers/staging/lustre/lustre/llite/namei.c +++ b/drivers/staging/lustre/lustre/llite/namei.c @@ -606,8 +606,12 @@ static struct dentry *ll_lookup_nd(struct inode *parent, struct dentry *dentry, CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p),flags=%u\n", dentry, PFID(ll_inode2fid(parent)), parent, flags); - /* Optimize away (CREATE && !OPEN). Let .create handle the race. */ - if ((flags & LOOKUP_CREATE) && !(flags & LOOKUP_OPEN)) + /* Optimize away (CREATE && !OPEN). Let .create handle the race. + * but only if we have write permissions there, otherwise we need + * to proceed with lookup. LU-4185 + */ + if ((flags & LOOKUP_CREATE) && !(flags & LOOKUP_OPEN) && + (inode_permission(parent, MAY_WRITE | MAY_EXEC) == 0)) return NULL; if (flags & (LOOKUP_PARENT|LOOKUP_OPEN|LOOKUP_CREATE)) -- 2.30.2