r20089: Put gpfs acl function into vfs_gpfs module. Thanks to Gomati Mohanan

<gomati.mohanan@in.ibm.com>.

Also fix fields for sec_desc differences between 3.0 and 3.0.24 in
nfs4_acls.c.
(This used to be commit 3d6f387783467bbd7ea88d6a853b41572badf1ef)

1 files changed, 576 insertions, 0 deletions

diff --git a/source3/modules/vfs_gpfs.c b/source3/modules/vfs_gpfs.c
index c5658ceb51..9cc9f78381 100644
--- a/source3/modules/vfs_gpfs.c
+++ b/source3/modules/vfs_gpfs.c
@@ -5,6 +5,7 @@
    Copyright (C) Christian Ambach <cambach1@de.ibm.com> 2006
    
    Major code contributions by Chetan Shringarpure <chetan.sh@in.ibm.com>
+                            and Gomati Mohanan <gomati.mohanan@in.ibm.com>
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -25,6 +26,12 @@
 
 #include "includes.h"
 
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+#include <gpfs_gpl.h>
+#include "nfs4_acls.h"
+
 
 static int vfs_gpfs_kernel_flock(vfs_handle_struct *handle, files_struct *fsp, 
 				 int fd, uint32 share_mode)
@@ -45,6 +52,539 @@ static int vfs_gpfs_kernel_flock(vfs_handle_struct *handle, files_struct *fsp,
 	return 0;
 }
 
+static void gpfs_dumpacl(int level, struct gpfs_acl *gacl)
+{
+	int	i;
+	if (gacl==NULL)
+	{
+		DEBUG(0, ("gpfs acl is NULL\n"));
+		return;
+	}
+
+	DEBUG(level, ("gpfs acl: nace: %d, type:%d, version:%d, level:%d, len:%d\n",
+		gacl->acl_nace, gacl->acl_type, gacl->acl_version, gacl->acl_level, gacl->acl_len));
+	for(i=0; i<gacl->acl_nace; i++)
+	{
+		struct gpfs_ace_v4 *gace = gacl->ace_v4 + i;
+		DEBUG(level, ("\tace[%d]: type:%d, flags:0x%x, mask:0x%x, iflags:0x%x, who:%u\n",
+			i, gace->aceType, gace->aceFlags, gace->aceMask,
+			gace->aceIFlags, gace->aceWho));
+	}
+}
+
+static struct gpfs_acl *gpfs_getacl_alloc(const char *fname, gpfs_aclType_t type)
+{
+	struct gpfs_acl *acl;
+	size_t len = 200;
+	int ret;
+	TALLOC_CTX *mem_ctx = main_loop_talloc_get();
+
+	acl = (struct gpfs_acl *)talloc_size(mem_ctx, len);
+	if (acl == NULL) {
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	acl->acl_len = len;
+	acl->acl_level = 0;
+	acl->acl_version = 0;
+	acl->acl_type = type;
+
+	ret = smbd_gpfs_getacl((char *)fname, GPFS_GETACL_STRUCT | GPFS_ACL_SAMBA, acl);
+	if ((ret != 0) && (errno == ENOSPC)) {
+		struct gpfs_acl *new_acl = (struct gpfs_acl *)talloc_size(
+			mem_ctx, acl->acl_len + sizeof(struct gpfs_acl));
+		if (new_acl == NULL) {
+			errno = ENOMEM;
+			return NULL;
+		}
+
+		new_acl->acl_len = acl->acl_len;
+		new_acl->acl_level = acl->acl_level;
+		new_acl->acl_version = acl->acl_version;
+		new_acl->acl_type = acl->acl_type;
+		acl = new_acl;
+
+		ret = smbd_gpfs_getacl((char *)fname, GPFS_GETACL_STRUCT | GPFS_ACL_SAMBA, acl);
+	}
+	if (ret != 0)
+	{
+		DEBUG(8, ("smbd_gpfs_getacl failed with %s\n",strerror(errno)));
+		return NULL;
+	}
+
+	return acl;
+}
+
+static BOOL gpfs_get_nfs4_acl(struct files_struct *fsp, SMB4ACL_T **ppacl, BOOL *pretryPosix)
+{
+	TALLOC_CTX *mem_ctx;
+	int i;
+	struct gpfs_acl *gacl = NULL;
+
+	mem_ctx = main_loop_talloc_get();
+
+	DEBUG(10, ("gpfs_get_nfs4_acl invoked for %s\n", fsp->fsp_name));
+
+	/* First get the real acl length */
+	gacl = gpfs_getacl_alloc(fsp->fsp_name, GPFS_ACL_TYPE_NFS4);
+	if (gacl == NULL) {
+		DEBUG(9, ("gpfs_getacl failed for %s with %s\n",
+			   fsp->fsp_name, strerror(errno)));
+		return False;
+	}
+
+	if (gacl->acl_type != GPFS_ACL_TYPE_NFS4) {
+		DEBUG(10, ("Got non-nfsv4 acl\n"));
+		*pretryPosix = True;
+		return False;
+	}
+
+	*ppacl = smb_create_smb4acl();
+
+	DEBUG(10, ("len: %d, level: %d, version: %d, nace: %d\n",
+		   gacl->acl_len, gacl->acl_level, gacl->acl_version,
+		   gacl->acl_nace));
+
+	for (i=0; i<gacl->acl_nace; i++) {
+		struct gpfs_ace_v4 *gace = &gacl->ace_v4[i];
+		SMB_ACE4PROP_T smbace;
+		memset(&smbace, 0, sizeof(SMB4ACE_T));
+
+		DEBUG(10, ("type: %d, iflags: %x, flags: %x, mask: %x, "
+			   "who: %d\n", gace->aceType, gace->aceIFlags,
+			   gace->aceFlags, gace->aceMask, gace->aceWho));
+
+		if (gace->aceIFlags & ACE4_IFLAG_SPECIAL_ID) {
+			smbace.flags |= SMB_ACE4_ID_SPECIAL;
+			switch (gace->aceWho) {
+			case ACE4_SPECIAL_OWNER:
+				smbace.who.special_id = SMB_ACE4_WHO_OWNER;
+				break;
+			case ACE4_SPECIAL_GROUP:
+				smbace.who.special_id = SMB_ACE4_WHO_GROUP;
+				break;
+			case ACE4_SPECIAL_EVERYONE:
+				smbace.who.special_id = SMB_ACE4_WHO_EVERYONE;
+				break;
+			default:
+				DEBUG(8, ("invalid special gpfs id %d "
+					  "ignored\n", gace->aceWho));
+				continue; /* don't add it */
+			}
+		} else {
+			if (gace->aceFlags & ACE4_FLAG_GROUP_ID)
+				smbace.who.gid = gace->aceWho;
+			else
+				smbace.who.uid = gace->aceWho;
+		}
+
+		smbace.aceType = gace->aceType;
+		smbace.aceFlags = gace->aceFlags;
+		smbace.aceMask = gace->aceMask;
+		smbace.flags = (gace->aceIFlags&ACE4_IFLAG_SPECIAL_ID) ? SMB_ACE4_ID_SPECIAL : 0;
+
+		smb_add_ace4(*ppacl, &smbace);
+	}
+
+	return True;
+}
+
+static size_t gpfsacl_get_nt_acl_common(files_struct *fsp,
+	uint32 security_info, SEC_DESC **ppdesc)
+{
+	SMB4ACL_T *pacl = NULL;
+	BOOL	result;
+	BOOL	retryPosix = False;
+
+	*ppdesc = NULL;
+	result = gpfs_get_nfs4_acl(fsp, &pacl, &retryPosix);
+	if (retryPosix)
+	{
+		DEBUG(10, ("retrying with posix acl...\n"));
+		return get_nt_acl(fsp, security_info, ppdesc);
+	}
+	if (result==False)
+		return 0;
+
+	return smb_get_nt_acl_nfs4(fsp, security_info, ppdesc, pacl);
+}
+
+size_t gpfsacl_fget_nt_acl(vfs_handle_struct *handle,
+	files_struct *fsp, int fd, uint32 security_info,
+	SEC_DESC **ppdesc)
+{
+        return gpfsacl_get_nt_acl_common(fsp, security_info, ppdesc);
+}
+
+size_t gpfsacl_get_nt_acl(vfs_handle_struct *handle,
+	files_struct *fsp, const char *name,
+	uint32 security_info, SEC_DESC **ppdesc)
+{
+	return gpfsacl_get_nt_acl_common(fsp, security_info, ppdesc);
+}
+
+static BOOL gpfsacl_process_smbacl(files_struct *fsp, SMB4ACL_T *smbacl)
+{
+	int ret;
+	gpfs_aclLen_t gacl_len;
+	SMB4ACE_T	*smbace;
+	struct gpfs_acl *gacl;
+	TALLOC_CTX *mem_ctx  = main_loop_talloc_get();
+
+	gacl_len = sizeof(struct gpfs_acl) +
+		(smb_get_naces(smbacl)-1)*sizeof(gpfs_ace_v4_t);
+
+	gacl = talloc_size(mem_ctx, gacl_len);
+	if (gacl == NULL) {
+		DEBUG(0, ("talloc failed\n"));
+		errno = ENOMEM;
+		return False;
+	}
+
+	gacl->acl_len = gacl_len;
+	gacl->acl_level = 0;
+	gacl->acl_version = GPFS_ACL_VERSION_NFS4;
+	gacl->acl_type = GPFS_ACL_TYPE_NFS4;
+	gacl->acl_nace = 0; /* change later... */
+
+	for (smbace=smb_first_ace4(smbacl); smbace!=NULL; smbace = smb_next_ace4(smbace)) {
+		struct gpfs_ace_v4 *gace = &gacl->ace_v4[gacl->acl_nace];
+		SMB_ACE4PROP_T	*aceprop = smb_get_ace4(smbace);
+
+		gace->aceType = aceprop->aceType;
+		gace->aceFlags = aceprop->aceFlags;
+		gace->aceMask = aceprop->aceMask;
+		gace->aceIFlags = (aceprop->flags&SMB_ACE4_ID_SPECIAL) ? ACE4_IFLAG_SPECIAL_ID : 0;
+
+		if (aceprop->flags&SMB_ACE4_ID_SPECIAL)
+		{
+			switch(aceprop->who.special_id)
+			{
+			case SMB_ACE4_WHO_EVERYONE:
+				gace->aceWho = ACE4_SPECIAL_EVERYONE;
+				break;
+			case SMB_ACE4_WHO_OWNER:
+				gace->aceWho = ACE4_SPECIAL_OWNER;
+				break;
+			case SMB_ACE4_WHO_GROUP:
+				gace->aceWho = ACE4_SPECIAL_GROUP;
+				break;
+			default:
+				DEBUG(8, ("unsupported special_id %d\n", aceprop->who.special_id));
+				continue; /* don't add it !!! */
+			}
+		} else {
+			/* just only for the type safety... */
+			if (aceprop->aceFlags&SMB_ACE4_IDENTIFIER_GROUP)
+				gace->aceWho = aceprop->who.gid;
+			else
+				gace->aceWho = aceprop->who.uid;
+		}
+
+		gacl->acl_nace++;
+	}
+
+	ret = smbd_gpfs_putacl(fsp->fsp_name, GPFS_PUTACL_STRUCT | GPFS_ACL_SAMBA, gacl);
+	if (ret != 0) {
+		DEBUG(8, ("gpfs_putacl failed with %s\n", strerror(errno)));
+		gpfs_dumpacl(8, gacl);
+		return False;
+	}
+
+	DEBUG(10, ("gpfs_putacl succeeded\n"));
+	return True;
+}
+
+static BOOL gpfsacl_set_nt_acl_internal(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
+{
+	struct gpfs_acl *acl;
+	BOOL	result = False;
+
+	acl = gpfs_getacl_alloc(fsp->fsp_name, GPFS_ACL_TYPE_ACCESS);
+	if (acl == NULL)
+		return False;
+
+	if (acl->acl_version&GPFS_ACL_VERSION_NFS4)
+	{
+		result = smb_set_nt_acl_nfs4(
+			fsp, security_info_sent, psd,
+			gpfsacl_process_smbacl);
+	} else { /* assume POSIX ACL - by default... */
+		result = set_nt_acl(fsp, security_info_sent, psd);
+	}
+
+	return result;
+}
+
+static BOOL gpfsacl_fset_nt_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, uint32 security_info_sent, SEC_DESC *psd)
+{
+	return gpfsacl_set_nt_acl_internal(fsp, security_info_sent, psd);
+}
+
+static BOOL gpfsacl_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp, char *name, uint32 security_info_sent, SEC_DESC *psd)
+{
+	return gpfsacl_set_nt_acl_internal(fsp, security_info_sent, psd);
+}
+
+static SMB_ACL_T gpfs2smb_acl(const struct gpfs_acl *pacl)
+{
+	SMB_ACL_T result;
+	int i;
+
+	result = sys_acl_init(pacl->acl_nace);
+	if (result == NULL) {
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	result->count = pacl->acl_nace;
+
+	for (i=0; i<pacl->acl_nace; i++) {
+		struct smb_acl_entry *ace = &result->acl[i];
+		const struct gpfs_ace_v1 *g_ace = &pacl->ace_v1[i];
+
+		DEBUG(10, ("Converting type %d id %lu perm %x\n",
+			   (int)g_ace->ace_type, (unsigned long)g_ace->ace_who,
+			   (int)g_ace->ace_perm));
+
+		switch (g_ace->ace_type) {
+		case GPFS_ACL_USER:
+			ace->a_type = SMB_ACL_USER;
+			ace->uid = (uid_t)g_ace->ace_who;
+			break;
+		case GPFS_ACL_USER_OBJ:
+			ace->a_type = SMB_ACL_USER_OBJ;
+			break;
+		case GPFS_ACL_GROUP:
+			ace->a_type = SMB_ACL_GROUP;
+			ace->gid = (gid_t)g_ace->ace_who;
+			break;
+		case GPFS_ACL_GROUP_OBJ:
+ 			ace->a_type = SMB_ACL_GROUP_OBJ;
+			break;
+		case GPFS_ACL_OTHER:
+			ace->a_type = SMB_ACL_OTHER;
+			break;
+		case GPFS_ACL_MASK:
+			ace->a_type = SMB_ACL_MASK;
+			break;
+		default:
+			DEBUG(10, ("Got invalid ace_type: %d\n",
+				   g_ace->ace_type));
+			errno = EINVAL;
+			SAFE_FREE(result);
+			return NULL;
+		}
+
+		ace->a_perm = 0;
+		ace->a_perm |= (g_ace->ace_perm & ACL_PERM_READ) ?
+			SMB_ACL_READ : 0;
+		ace->a_perm |= (g_ace->ace_perm & ACL_PERM_WRITE) ?
+			SMB_ACL_WRITE : 0;
+		ace->a_perm |= (g_ace->ace_perm & ACL_PERM_EXECUTE) ?
+			SMB_ACL_EXECUTE : 0;
+
+		DEBUGADD(10, ("Converted to %d perm %x\n",
+			      ace->a_type, ace->a_perm));
+	}
+
+	return result;
+}
+
+static SMB_ACL_T gpfsacl_get_posix_acl(const char *path, gpfs_aclType_t type)
+{
+	struct gpfs_acl *pacl;
+	SMB_ACL_T result = NULL;
+
+	pacl = gpfs_getacl_alloc(path, type);
+
+	if (pacl == NULL) {
+		DEBUG(10, ("gpfs_getacl failed for %s with %s\n",
+			   path, strerror(errno)));
+		if (errno == 0) {
+			errno = EINVAL;
+		}
+		goto done;
+	}
+
+	if (pacl->acl_version != GPFS_ACL_VERSION_POSIX) {
+		DEBUG(10, ("Got acl version %d, expected %d\n",
+			   pacl->acl_version, GPFS_ACL_VERSION_POSIX));
+		errno = EINVAL;
+		goto done;
+	}
+	
+	DEBUG(10, ("len: %d, level: %d, version: %d, nace: %d\n",
+		   pacl->acl_len, pacl->acl_level, pacl->acl_version,
+		   pacl->acl_nace));
+
+	result = gpfs2smb_acl(pacl);
+	if (result == NULL) {
+		goto done;
+	}
+
+ done:
+
+	if (errno != 0) {
+		SAFE_FREE(result);
+	}
+	return result;	
+}
+
+SMB_ACL_T gpfsacl_sys_acl_get_file(vfs_handle_struct *handle,
+				    
+				    const char *path_p,
+				    SMB_ACL_TYPE_T type)
+{
+	gpfs_aclType_t gpfs_type;
+
+	switch(type) {
+	case SMB_ACL_TYPE_ACCESS:
+		gpfs_type = GPFS_ACL_TYPE_ACCESS;
+		break;
+	case SMB_ACL_TYPE_DEFAULT:
+		gpfs_type = GPFS_ACL_TYPE_DEFAULT;
+		break;
+	default:
+		DEBUG(0, ("Got invalid type: %d\n", type));
+		smb_panic("exiting");
+	}
+
+	return gpfsacl_get_posix_acl(path_p, gpfs_type);
+}
+
+SMB_ACL_T gpfsacl_sys_acl_get_fd(vfs_handle_struct *handle,
+				  files_struct *fsp,
+				  int fd)
+{
+	return gpfsacl_get_posix_acl(fsp->fsp_name, GPFS_ACL_TYPE_ACCESS);
+}
+
+static struct gpfs_acl *smb2gpfs_acl(const SMB_ACL_T pacl,
+				     SMB_ACL_TYPE_T type)
+{
+	gpfs_aclLen_t len;
+	struct gpfs_acl *result;
+	int i;
+	union gpfs_ace_union
+	{
+		gpfs_ace_v1_t  ace_v1[1]; /* when GPFS_ACL_VERSION_POSIX */
+		gpfs_ace_v4_t  ace_v4[1]; /* when GPFS_ACL_VERSION_NFS4  */
+	};
+
+	DEBUG(10, ("smb2gpfs_acl: Got ACL with %d entries\n", pacl->count));
+
+	len = sizeof(struct gpfs_acl) - sizeof(union gpfs_ace_union) +
+		(pacl->count)*sizeof(gpfs_ace_v1_t);
+
+	result = SMB_MALLOC(len);
+	if (result == NULL) {
+		errno = ENOMEM;
+		return result;
+	}
+
+	result->acl_len = len;
+	result->acl_level = 0;
+	result->acl_version = GPFS_ACL_VERSION_POSIX;
+	result->acl_type = (type == SMB_ACL_TYPE_DEFAULT) ?
+		GPFS_ACL_TYPE_DEFAULT : GPFS_ACL_TYPE_ACCESS;
+	result->acl_nace = pacl->count;
+
+	for (i=0; i<pacl->count; i++) {
+		const struct smb_acl_entry *ace = &pacl->acl[i];
+		struct gpfs_ace_v1 *g_ace = &result->ace_v1[i];
+		
+		DEBUG(10, ("Converting type %d perm %x\n",
+			   (int)ace->a_type, (int)ace->a_perm));
+
+		g_ace->ace_perm = 0;
+
+		switch(ace->a_type) {
+		case SMB_ACL_USER:
+			g_ace->ace_type = GPFS_ACL_USER;
+			g_ace->ace_who = (gpfs_uid_t)ace->uid;
+			break;
+		case SMB_ACL_USER_OBJ:
+			g_ace->ace_type = GPFS_ACL_USER_OBJ;
+			g_ace->ace_perm |= ACL_PERM_CONTROL;
+			g_ace->ace_who = 0;
+			break;
+		case SMB_ACL_GROUP:
+			g_ace->ace_type = GPFS_ACL_GROUP;
+			g_ace->ace_who = (gpfs_uid_t)ace->gid;
+			break;
+		case SMB_ACL_GROUP_OBJ:
+			g_ace->ace_type = GPFS_ACL_GROUP_OBJ;
+			g_ace->ace_who = 0;
+			break;
+		case SMB_ACL_MASK:
+			g_ace->ace_type = GPFS_ACL_MASK;
+			g_ace->ace_perm = 0x8f;
+			g_ace->ace_who = 0;
+			break;
+		case SMB_ACL_OTHER:
+			g_ace->ace_type = GPFS_ACL_OTHER;
+			g_ace->ace_who = 0;
+			break;
+		default:
+			DEBUG(10, ("Got invalid ace_type: %d\n", ace->a_type));
+			errno = EINVAL;
+			SAFE_FREE(result);
+			return NULL;
+		}
+
+		g_ace->ace_perm |= (ace->a_perm & SMB_ACL_READ) ?
+			ACL_PERM_READ : 0;
+		g_ace->ace_perm |= (ace->a_perm & SMB_ACL_WRITE) ?
+			ACL_PERM_WRITE : 0;
+		g_ace->ace_perm |= (ace->a_perm & SMB_ACL_EXECUTE) ?
+			ACL_PERM_EXECUTE : 0;
+
+		DEBUGADD(10, ("Converted to %d id %d perm %x\n",
+			      g_ace->ace_type, g_ace->ace_who, g_ace->ace_perm));
+	}
+
+	return result;
+}
+
+int gpfsacl_sys_acl_set_file(vfs_handle_struct *handle,
+			      
+			      const char *name,
+			      SMB_ACL_TYPE_T type,
+			      SMB_ACL_T theacl)
+{
+	struct gpfs_acl *gpfs_acl;
+	int result;
+
+	gpfs_acl = smb2gpfs_acl(theacl, type);
+	if (gpfs_acl == NULL) {
+		return -1;
+	}
+
+	result = smbd_gpfs_putacl((char *)name, GPFS_PUTACL_STRUCT | GPFS_ACL_SAMBA, gpfs_acl);
+
+	SAFE_FREE(gpfs_acl);
+	return result;
+}
+
+int gpfsacl_sys_acl_set_fd(vfs_handle_struct *handle,
+			    files_struct *fsp,
+			    int fd, SMB_ACL_T theacl)
+{
+	errno = ENOTSUP;
+	return -1;
+}
+
+int gpfsacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
+				     
+				     const char *path)
+{
+	errno = ENOTSUP;
+	return -1;
+}
+
+/* VFS operations structure */
 
 static vfs_op_tuple gpfs_op_tuples[] = {
 
@@ -52,6 +592,42 @@ static vfs_op_tuple gpfs_op_tuples[] = {
 	 SMB_VFS_OP_KERNEL_FLOCK,
 	 SMB_VFS_LAYER_OPAQUE},
 
+	{SMB_VFS_OP(gpfsacl_fget_nt_acl),
+        SMB_VFS_OP_FGET_NT_ACL,
+        SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_get_nt_acl),
+        SMB_VFS_OP_GET_NT_ACL,
+        SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_fset_nt_acl),
+        SMB_VFS_OP_FSET_NT_ACL,
+        SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_set_nt_acl),
+        SMB_VFS_OP_SET_NT_ACL,
+        SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_sys_acl_get_file),
+         SMB_VFS_OP_SYS_ACL_GET_FILE,
+         SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_sys_acl_get_fd),
+         SMB_VFS_OP_SYS_ACL_GET_FD,
+         SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_sys_acl_set_file),
+         SMB_VFS_OP_SYS_ACL_SET_FILE,
+         SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_sys_acl_set_fd),
+         SMB_VFS_OP_SYS_ACL_SET_FD,
+         SMB_VFS_LAYER_TRANSPARENT},
+
+        {SMB_VFS_OP(gpfsacl_sys_acl_delete_def_file),
+         SMB_VFS_OP_SYS_ACL_DELETE_DEF_FILE,
+         SMB_VFS_LAYER_TRANSPARENT},
+
 	{SMB_VFS_OP(NULL),
 	 SMB_VFS_OP_NOOP,
 	 SMB_VFS_LAYER_NOOP}