diff options
Diffstat (limited to 'usr/src/uts/common/nfs/export.h')
| -rw-r--r-- | usr/src/uts/common/nfs/export.h | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/usr/src/uts/common/nfs/export.h b/usr/src/uts/common/nfs/export.h index 79c605a21e..9bc35d0a6a 100644 --- a/usr/src/uts/common/nfs/export.h +++ b/usr/src/uts/common/nfs/export.h @@ -19,7 +19,7 @@ * CDDL HEADER END */ /* - * Copyright 2009 Sun Microsystems, Inc. All rights reserved. + * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ @@ -301,11 +301,15 @@ struct svc_req; /* * Treenodes are used to build tree representing every node which is part - * of nfs server pseudo namespace. - * This tree is interconnected with both exportinfo and exp_visible struct. - * When there is a need to walk the namespace (either starting in - * exportinfo or in exp_visible) we first make a step aside (to the left), - * walk up or down as needed, and then we step back (to the right). + * of nfs server pseudo namespace. They are connected with both exportinfo + * and exp_visible struct. They were introduced to avoid lookup of ".." + * in the underlying file system during unshare, which was failing if the + * file system was forcibly unmounted or if the directory was removed. + * One exp_visible_t can be shared via several treenode_t, i.e. + * different tree_vis can point to the same exp_visible_t. + * This will happen if some directory is on two different shared paths: + * E.g. after share /tmp/a/b1 and share /tmp/a/b2 there will be two treenodes + * corresponding to /tmp/a and both will have same value in tree_vis. * * * @@ -349,9 +353,9 @@ struct svc_req; * * * Bi-directional interconnect: - * * treenode_t::tree_exi --------- exportinfo_t::exi_tree - * treenode_t::tree_vis ......... exp_visible_t::vis_tree + * One-way direction connection: + * treenode_t::tree_vis .........> exp_visible_t */ /* Access to treenode_t is under protection of exported_lock RW_LOCK */ typedef struct treenode { @@ -457,7 +461,6 @@ struct exp_visible { int vis_count; int vis_exported; struct exp_visible *vis_next; - struct treenode *vis_tree; struct secinfo *vis_secinfo; int vis_seccnt; }; @@ -523,7 +526,7 @@ extern char *build_symlink(vnode_t *, cred_t *, size_t *); /* * Functions that handle the NFSv4 server namespace */ -extern exportinfo_t *vis2exi(struct exp_visible *); +extern exportinfo_t *vis2exi(treenode_t *); extern int treeclimb_export(struct exportinfo *); extern void treeclimb_unexport(struct exportinfo *); extern int nfs_visible(struct exportinfo *, vnode_t *, int *); |