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authorAndy Adamson <andros@netapp.com>2011-06-14 02:25:56 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-06-15 19:24:29 +0400
commit533eb4611c9eea53072eb6a61d5a6393b6a77ed7 (patch)
treeadb2b4cbfe85689979d2cf971b65ebcd0d383d56 /fs
parent1d92a08da23848a38eece4df7eaa4e8ec0e6c699 (diff)
downloadlinux-533eb4611c9eea53072eb6a61d5a6393b6a77ed7.tar.xz
NFSv4.1: allow nfs_fhget to succeed with mounted on fileid
Commit 28331a46d88459788c8fca72dbb0415cd7f514c9 "Ensure we request the ordinary fileid when doing readdirplus" changed the meaning of NFS_ATTR_FATTR_FILEID which used to be set when FATTR4_WORD1_MOUNTED_ON_FILED was requested. Allow nfs_fhget to succeed with only a mounted on fileid when crossing a mountpoint or a referral. Ask for the fileid of the absent file system if mounted_on_fileid is not supported. Signed-off-by: Andy Adamson <andros@netapp.com> cc:stable@kernel.org [2.6.39] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/inode.c3
-rw-r--r--fs/nfs/internal.h11
-rw-r--r--fs/nfs/nfs4proc.c33
3 files changed, 36 insertions, 11 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 3f1eb8180373..6f4850deb272 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -256,7 +256,8 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
nfs_attr_check_mountpoint(sb, fattr);
- if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0 && (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0)
+ if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
+ !nfs_attr_use_mounted_on_fileid(fattr))
goto out_no_inode;
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
goto out_no_inode;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index b9056cbe68d6..2a55347a2daa 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -45,6 +45,17 @@ static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct
fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
}
+static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
+{
+ if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
+ (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
+ ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
+ return 0;
+
+ fattr->fileid = fattr->mounted_on_fileid;
+ return 1;
+}
+
struct nfs_clone_mount {
const struct super_block *sb;
const struct dentry *dentry;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3ca449789545..289c539bd6b3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2265,12 +2265,14 @@ static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
return nfs4_map_errors(status);
}
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
/*
* Get locations and (maybe) other attributes of a referral.
* Note that we'll actually follow the referral later when
* we detect fsid mismatch in inode revalidation
*/
-static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
+static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
+ struct nfs_fattr *fattr, struct nfs_fh *fhandle)
{
int status = -ENOMEM;
struct page *page = NULL;
@@ -2288,15 +2290,16 @@ static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct
goto out;
/* Make sure server returned a different fsid for the referral */
if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
- dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
+ dprintk("%s: server did not return a different fsid for"
+ " a referral at %s\n", __func__, name->name);
status = -EIO;
goto out;
}
+ /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
+ nfs_fixup_referral_attributes(&locations->fattr);
+ /* replace the lookup nfs_fattr with the locations nfs_fattr */
memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
- fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
- if (!fattr->mode)
- fattr->mode = S_IFDIR;
memset(fhandle, 0, sizeof(struct nfs_fh));
out:
if (page)
@@ -4667,11 +4670,15 @@ static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
return len;
}
+/*
+ * nfs_fhget will use either the mounted_on_fileid or the fileid
+ */
static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
{
- if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
- (fattr->valid & NFS_ATTR_FATTR_FSID) &&
- (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
+ if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
+ (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
+ (fattr->valid & NFS_ATTR_FATTR_FSID) &&
+ (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
return;
fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
@@ -4686,7 +4693,6 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
struct nfs_server *server = NFS_SERVER(dir);
u32 bitmask[2] = {
[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
- [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
};
struct nfs4_fs_locations_arg args = {
.dir_fh = NFS_FH(dir),
@@ -4705,11 +4711,18 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
int status;
dprintk("%s: start\n", __func__);
+
+ /* Ask for the fileid of the absent filesystem if mounted_on_fileid
+ * is not supported */
+ if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
+ bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
+ else
+ bitmask[0] |= FATTR4_WORD0_FILEID;
+
nfs_fattr_init(&fs_locations->fattr);
fs_locations->server = server;
fs_locations->nlocations = 0;
status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
- nfs_fixup_referral_attributes(&fs_locations->fattr);
dprintk("%s: returned status = %d\n", __func__, status);
return status;
}