On Fri, Feb 01, 2013 at 08:15:37AM -0500, J. Bruce Fields wrote:
> From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
>
> We're currently ignoring errors from vfs_getattr.
>
> The correct thing to do is to do the stat in the main service procedure
> not in the response encoding.
FWIW, I'd combine that with parts of commit I've got in my tree; I think
nfsd_getattr() in your variant isn't the best API here. All callers
that want nfserrno want vfsmount/dentry coming from some fhandle. Diff
below is introducing such helper and switching to its use (warning: edited
patch; only obvious editing done there, but still). It does *not* address
the issue your patch deals with (see /* BUG */ in there), but I really
think it's a better interface than your variant. FWIW, the rest of the
commit in question is switching vfs_getattr() to struct path *; I'd
edited those parts out of the diff below. Comments?
new helper: fh_getattr
A bunch of places in nfsd want vfs_getattr() done on object an fhandle
refers to, with nfs-encoded error (__be32). fh_getattr(fh, stat) does
just that; open-coded instances switched to it.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 1fc02df..4012899 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -43,7 +43,6 @@ static __be32
nfsd3_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
struct nfsd3_attrstat *resp)
{
- int err;
__be32 nfserr;
dprintk("nfsd: GETATTR(3) %s\n",
@@ -55,9 +54,7 @@ nfsd3_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
if (nfserr)
RETURN_STATUS(nfserr);
- err = vfs_getattr(resp->fh.fh_export->ex_path.mnt,
- resp->fh.fh_dentry, &resp->stat);
- nfserr = nfserrno(err);
+ nfserr = fh_getattr(&resp->fh, &resp->stat);
RETURN_STATUS(nfserr);
}
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 324c0ba..7af9417b 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -11,6 +11,7 @@
#include "xdr3.h"
#include "auth.h"
#include "netns.h"
+#include "vfs.h"
#define NFSDDBG_FACILITY NFSDDBG_XDR
@@ -204,10 +205,10 @@ encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
struct dentry *dentry = fhp->fh_dentry;
if (dentry && dentry->d_inode) {
- int err;
+ __be32 err;
struct kstat stat;
- err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat);
+ err = fh_getattr(fhp, &stat);
if (!err) {
*p++ = xdr_one; /* attributes follow */
lease_get_mtime(dentry->d_inode, &stat.mtime);
@@ -254,13 +255,12 @@ encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
*/
void fill_post_wcc(struct svc_fh *fhp)
{
- int err;
+ __be32 err;
if (fhp->fh_post_saved)
printk("nfsd: inode locked twice during operation.\n");
- err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
- &fhp->fh_post_attr);
+ err = fh_getattr(fhp, &fhp->fh_post_attr);
fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
if (err) {
fhp->fh_post_saved = 0;
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index aad6d45..54c6b3d 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -26,17 +26,13 @@ static __be32
nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
{
if (err) return err;
- return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
- resp->fh.fh_dentry,
- &resp->stat));
+ return fh_getattr(&resp->fh, &resp->stat);
}
static __be32
nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
{
if (err) return err;
- return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
- resp->fh.fh_dentry,
- &resp->stat));
+ return fh_getattr(&resp->fh, &resp->stat);
}
/*
* Get a file's attributes
@@ -150,9 +146,7 @@ nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
&resp->count);
if (nfserr) return nfserr;
- return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
- resp->fh.fh_dentry,
- &resp->stat));
+ return fh_getattr(&resp->fh, &resp->stat);
}
/*
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 979b421..bf6d3bc 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -4,6 +4,7 @@
* Copyright (C) 1995, 1996 Olaf Kirch <okir@xxxxxxxxxxxx>
*/
+#include "vfs.h"
#include "xdr.h"
#include "auth.h"
@@ -197,7 +198,7 @@ encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
{
struct kstat stat;
- vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat);
+ fh_getattr(fhp, &stat); /* BUG */
return encode_fattr(rqstp, p, fhp, &stat);
}
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index 359594c..5b58941 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -6,6 +6,7 @@
#define LINUX_NFSD_VFS_H
#include "nfsfh.h"
+#include "nfsd.h"
/*
* Flags for nfsd_permission
@@ -125,4 +126,11 @@ static inline void fh_drop_write(struct svc_fh *fh)
}
}
+static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
+{
+ return nfserrno(vfs_getattr(fh->fh_export->ex_path.mnt,
+ fh->fh_dentry,
+ stat));
+}
+
#endif /* LINUX_NFSD_VFS_H */
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