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NFS: Be strict about dentry revalidation when doing exclusive create 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-10-02 19:13:04 -04:00
parent b050aa791f
commit a12802cab8
1 changed files with 14 additions and 15 deletions
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29
fs/nfs/dir.c
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@ -668,6 +668,19 @@ static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigne
return nd->flags & mask;
}
/*
* Use intent information to check whether or not we're going to do
* an O_EXCL create using this path component.
*/
static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
{
if (NFS_PROTO(dir)->version == 2)
return 0;
if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0)
return 0;
return (nd->intent.open.flags & O_EXCL) != 0;
}
/*
* Inode and filehandle revalidation for lookups.
*
@ -754,7 +767,7 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
}
/* Force a full look up iff the parent directory has changed */
if (nfs_check_verifier(dir, dentry)) {
if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) {
if (nfs_lookup_verify_inode(inode, nd))
goto out_zap_parent;
goto out_valid;
@ -848,20 +861,6 @@ struct dentry_operations nfs_dentry_operations = {
.d_iput = nfs_dentry_iput,
};
/*
* Use intent information to check whether or not we're going to do
* an O_EXCL create using this path component.
*/
static inline
int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
{
if (NFS_PROTO(dir)->version == 2)
return 0;
if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0)
return 0;
return (nd->intent.open.flags & O_EXCL) != 0;
}
static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
{
struct dentry *res;