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staging/lustre: proper support of NFS anonymous dentries

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NFS can ask to encode dentries that are not connected to the root.
The fix check for parent is NULL and encode a file handle accordingly.

Reviewed-on: http://review.whamcloud.com/8347
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4231
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Acked-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Eremin 2016-02-14 19:13:52 -05:00 committed by Greg Kroah-Hartman
parent 020ecc6f32
commit cb77659272
2 changed files with 23 additions and 13 deletions
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30
drivers/staging/lustre/lustre/llite/llite_nfs.c
View file

@ -142,10 +142,11 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren
struct inode *inode;
struct dentry *result;
CDEBUG(D_INFO, "Get dentry for fid: "DFID"\n", PFID(fid));
if (!fid_is_sane(fid))
return ERR_PTR(-ESTALE);
CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));
inode = search_inode_for_lustre(sb, fid);
if (IS_ERR(inode))
return ERR_CAST(inode);
@ -161,7 +162,7 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren
* We have to find the parent to tell MDS how to init lov objects.
*/
if (S_ISREG(inode->i_mode) && !ll_i2info(inode)->lli_has_smd &&
parent != NULL) {
parent && !fid_is_zero(parent)) {
struct ll_inode_info *lli = ll_i2info(inode);
spin_lock(&lli->lli_lock);
@ -175,8 +176,6 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren
return result;
}
#define LUSTRE_NFS_FID 0x97
/**
* \a connectable - is nfsd will connect himself or this should be done
* at lustre
@ -189,20 +188,25 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren
static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
struct inode *parent)
{
int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
struct lustre_nfs_fid *nfs_fid = (void *)fh;
CDEBUG(D_INFO, "encoding for (%lu,"DFID") maxlen=%d minlen=%d\n",
inode->i_ino, PFID(ll_inode2fid(inode)), *plen,
(int)sizeof(struct lustre_nfs_fid));
inode->i_ino, PFID(ll_inode2fid(inode)), *plen, fileid_len);
if (*plen < sizeof(struct lustre_nfs_fid) / 4)
return 255;
if (*plen < fileid_len) {
*plen = fileid_len;
return FILEID_INVALID;
}
nfs_fid->lnf_child = *ll_inode2fid(inode);
nfs_fid->lnf_parent = *ll_inode2fid(parent);
*plen = sizeof(struct lustre_nfs_fid) / 4;
if (parent)
nfs_fid->lnf_parent = *ll_inode2fid(parent);
else
fid_zero(&nfs_fid->lnf_parent);
*plen = fileid_len;
return LUSTRE_NFS_FID;
return FILEID_LUSTRE;
}
static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
@ -261,7 +265,7 @@ static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
{
struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
if (fh_type != LUSTRE_NFS_FID)
if (fh_type != FILEID_LUSTRE)
return ERR_PTR(-EPROTO);
return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
@ -272,7 +276,7 @@ static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
{
struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;
if (fh_type != LUSTRE_NFS_FID)
if (fh_type != FILEID_LUSTRE)
return ERR_PTR(-EPROTO);
return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);

6
include/linux/exportfs.h
View file

@ -96,6 +96,12 @@ enum fid_type {
*/
FILEID_FAT_WITH_PARENT = 0x72,
/*
* 128 bit child FID (struct lu_fid)
* 128 bit parent FID (struct lu_fid)
*/
FILEID_LUSTRE = 0x97,
/*
* Filesystems must not use 0xff file ID.
*/