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nfsd: filter readdir results in V4ROOT case

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As with lookup, we treat every boject as a mountpoint and pretend it
doesn't exist if it isn't exported.

The preexisting code here is confusing, but I haven't yet figured out
how to make it clearer.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2009-10-25 21:43:01 -04:00
parent 82ead7fe41
commit 3227fa41ab
3 changed files with 9 additions and 4 deletions
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10
fs/nfsd/nfs4xdr.c
View file

@ -2196,11 +2196,14 @@ nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
* we will not follow the cross mount and will fill the attribtutes
* directly from the mountpoint dentry.
*/
if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
ignore_crossmnt = 1;
else if (d_mountpoint(dentry)) {
if (nfsd_mountpoint(dentry, exp)) {
int err;
if (!(exp->ex_flags & NFSEXP_V4ROOT)
&& !attributes_need_mount(cd->rd_bmval)) {
ignore_crossmnt = 1;
goto out_encode;
}
/*
* Why the heck aren't we just using nfsd_lookup??
* Different "."/".." handling? Something else?
@ -2216,6 +2219,7 @@ nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
goto out_put;
}
out_encode:
nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
cd->rd_rqstp, ignore_crossmnt);
out_put:

2
fs/nfsd/vfs.c
View file

@ -170,7 +170,7 @@ static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, st
* For nfsd purposes, we treat V4ROOT exports as though there was an
* export at *every* directory.
*/
static int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
{
if (d_mountpoint(dentry))
return 1;

1
fs/nfsd/vfs.h
View file

@ -40,6 +40,7 @@ __be32 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
struct svc_export **, struct dentry **);
__be32 nfsd_setattr(struct svc_rqst *, struct svc_fh *,
struct iattr *, int, time_t);
int nfsd_mountpoint(struct dentry *, struct svc_export *);
#ifdef CONFIG_NFSD_V4
__be32 nfsd4_set_nfs4_acl(struct svc_rqst *, struct svc_fh *,
struct nfs4_acl *);