diff options
Diffstat (limited to 'sys/fs/tmpfs/tmpfs_vnops.c')
-rw-r--r-- | sys/fs/tmpfs/tmpfs_vnops.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c index 88e0939..295d2ca 100644 --- a/sys/fs/tmpfs/tmpfs_vnops.c +++ b/sys/fs/tmpfs/tmpfs_vnops.c @@ -109,14 +109,19 @@ tmpfs_lookup(struct vop_cachedlookup_args *v) error = 0; } else { de = tmpfs_dir_lookup(dnode, NULL, cnp); - if (de == NULL) { + if (de != NULL && de->td_node == NULL) + cnp->cn_flags |= ISWHITEOUT; + if (de == NULL || de->td_node == NULL) { /* The entry was not found in the directory. * This is OK if we are creating or renaming an * entry and are working on the last component of * the path name. */ if ((cnp->cn_flags & ISLASTCN) && (cnp->cn_nameiop == CREATE || \ - cnp->cn_nameiop == RENAME)) { + cnp->cn_nameiop == RENAME || + (cnp->cn_nameiop == DELETE && + cnp->cn_flags & DOWHITEOUT && + cnp->cn_flags & ISWHITEOUT))) { error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, cnp->cn_thread); if (error != 0) @@ -834,6 +839,8 @@ tmpfs_remove(struct vop_remove_args *v) /* Remove the entry from the directory; as it is a file, we do not * have to change the number of hard links of the directory. */ tmpfs_dir_detach(dvp, de); + if (v->a_cnp->cn_flags & DOWHITEOUT) + tmpfs_dir_whiteout_add(dvp, v->a_cnp); /* Free the directory entry we just deleted. Note that the node * referred by it will not be removed until the vnode is really @@ -904,6 +911,8 @@ tmpfs_link(struct vop_link_args *v) goto out; /* Insert the new directory entry into the appropriate directory. */ + if (cnp->cn_flags & ISWHITEOUT) + tmpfs_dir_whiteout_remove(dvp, cnp); tmpfs_dir_attach(dvp, de); /* vp link count has changed, so update node times. */ @@ -1099,6 +1108,10 @@ tmpfs_rename(struct vop_rename_args *v) /* Do the move: just remove the entry from the source directory * and insert it into the target one. */ tmpfs_dir_detach(fdvp, de); + if (fcnp->cn_flags & DOWHITEOUT) + tmpfs_dir_whiteout_add(fdvp, fcnp); + if (tcnp->cn_flags & ISWHITEOUT) + tmpfs_dir_whiteout_remove(tdvp, tcnp); tmpfs_dir_attach(tdvp, de); } @@ -1223,6 +1236,8 @@ tmpfs_rmdir(struct vop_rmdir_args *v) /* Detach the directory entry from the directory (dnode). */ tmpfs_dir_detach(dvp, de); + if (v->a_cnp->cn_flags & DOWHITEOUT) + tmpfs_dir_whiteout_add(dvp, v->a_cnp); /* No vnode should be allocated for this entry from this point */ TMPFS_NODE_LOCK(node); @@ -1541,6 +1556,29 @@ tmpfs_vptofh(struct vop_vptofh_args *ap) return (0); } +static int +tmpfs_whiteout(struct vop_whiteout_args *ap) +{ + struct vnode *dvp = ap->a_dvp; + struct componentname *cnp = ap->a_cnp; + struct tmpfs_dirent *de; + + switch (ap->a_flags) { + case LOOKUP: + return (0); + case CREATE: + de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); + if (de != NULL) + return (de->td_node == NULL ? 0 : EEXIST); + return (tmpfs_dir_whiteout_add(dvp, cnp)); + case DELETE: + tmpfs_dir_whiteout_remove(dvp, cnp); + return (0); + default: + panic("tmpfs_whiteout: unknown op"); + } +} + /* --------------------------------------------------------------------- */ /* @@ -1573,6 +1611,7 @@ struct vop_vector tmpfs_vnodeop_entries = { .vop_print = tmpfs_print, .vop_pathconf = tmpfs_pathconf, .vop_vptofh = tmpfs_vptofh, + .vop_whiteout = tmpfs_whiteout, .vop_bmap = VOP_EOPNOTSUPP, }; |