*/
#include "xfs.h"
+#include "xfs_types.h"
+#include "xfs_dmapi.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_dir.h"
+#include "xfs_mount.h"
+#include "xfs_export.h"
+
+/*
+ * XFS encode and decodes the fileid portion of NFS filehandles
+ * itself instead of letting the generic NFS code do it. This
+ * allows filesystems with 64 bit inode numbers to be exported.
+ *
+ * Note that a side effect is that xfs_vget() won't be passed a
+ * zero inode/generation pair under normal circumstances. As
+ * however a malicious client could send us such data, the check
+ * remains in that code.
+ */
STATIC struct dentry *
struct dentry *de),
void *context)
{
- __u32 parent[2];
- parent[0] = parent[1] = 0;
-
- if (fh_len < 2 || fileid_type > 2)
+ xfs_fid2_t ifid;
+ xfs_fid2_t pfid;
+ void *parent = NULL;
+ int is64 = 0;
+ __u32 *p = fh;
+
+#if XFS_BIG_INUMS
+ is64 = (fileid_type & XFS_FILEID_TYPE_64FLAG);
+ fileid_type &= ~XFS_FILEID_TYPE_64FLAG;
+#endif
+
+ /*
+ * Note that we only accept fileids which are long enough
+ * rather than allow the parent generation number to default
+ * to zero. XFS considers zero a valid generation number not
+ * an invalid/wildcard value. There's little point printk'ing
+ * a warning here as we don't have the client information
+ * which would make such a warning useful.
+ */
+ if (fileid_type > 2 ||
+ fh_len < xfs_fileid_length((fileid_type == 2), is64))
return NULL;
-
- if (fileid_type == 2 && fh_len > 2) {
- if (fh_len == 3) {
- printk(KERN_WARNING
- "XFS: detected filehandle without "
- "parent inode generation information.");
- return ERR_PTR(-ESTALE);
- }
-
- parent[0] = fh[2];
- parent[1] = fh[3];
+
+ p = xfs_fileid_decode_fid2(p, &ifid, is64);
+
+ if (fileid_type == 2) {
+ p = xfs_fileid_decode_fid2(p, &pfid, is64);
+ parent = &pfid;
}
+ fh = (__u32 *)&ifid;
return find_exported_dentry(sb, fh, parent, acceptable, context);
+}
+
+STATIC int
+linvfs_encode_fh(
+ struct dentry *dentry,
+ __u32 *fh,
+ int *max_len,
+ int connectable)
+{
+ struct inode *inode = dentry->d_inode;
+ int type = 1;
+ __u32 *p = fh;
+ int len;
+ int is64 = 0;
+#if XFS_BIG_INUMS
+ vfs_t *vfs = LINVFS_GET_VFS(inode->i_sb);
+ xfs_mount_t *mp = XFS_VFSTOM(vfs);
+
+ if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT)) {
+ /* filesystem may contain 64bit inode numbers */
+ is64 = XFS_FILEID_TYPE_64FLAG;
+ }
+#endif
+
+ /* Directories don't need their parent encoded, they have ".." */
+ if (S_ISDIR(inode->i_mode))
+ connectable = 0;
+
+ /*
+ * Only encode if there is enough space given. In practice
+ * this means we can't export a filesystem with 64bit inodes
+ * over NFSv2 with the subtree_check export option; the other
+ * seven combinations work. The real answer is "don't use v2".
+ */
+ len = xfs_fileid_length(connectable, is64);
+ if (*max_len < len)
+ return 255;
+ *max_len = len;
+
+ p = xfs_fileid_encode_inode(p, inode, is64);
+ if (connectable) {
+ spin_lock(&dentry->d_lock);
+ p = xfs_fileid_encode_inode(p, dentry->d_parent->d_inode, is64);
+ spin_unlock(&dentry->d_lock);
+ type = 2;
+ }
+ BUG_ON((p - fh) != len);
+ return type | is64;
}
STATIC struct dentry *
vnode_t *vp;
struct inode *inode;
struct dentry *result;
- xfs_fid2_t xfid;
vfs_t *vfsp = LINVFS_GET_VFS(sb);
int error;
- xfid.fid_len = sizeof(xfs_fid2_t) - sizeof(xfid.fid_len);
- xfid.fid_pad = 0;
- xfid.fid_gen = ((__u32 *)data)[1];
- xfid.fid_ino = ((__u32 *)data)[0];
-
- VFS_VGET(vfsp, &vp, (fid_t *)&xfid, error);
+ VFS_VGET(vfsp, &vp, (fid_t *)data, error);
if (error || vp == NULL)
return ERR_PTR(-ESTALE) ;
struct export_operations linvfs_export_ops = {
.decode_fh = linvfs_decode_fh,
+ .encode_fh = linvfs_encode_fh,
.get_parent = linvfs_get_parent,
.get_dentry = linvfs_get_dentry,
};
git://git.onelab.eu / linux-2.6.git / blobdiff