int nfs4_op_putrootfh(struct nfs_argop4 *op, compound_data_t *data,
struct nfs_resop4 *resp)
{
fsal_status_t status = {0, 0};
struct fsal_obj_handle *file_obj;
PUTROOTFH4res * const res_PUTROOTFH4 = &resp->nfs_resop4_u.opputrootfh;
/* First of all, set the reply to zero to make sure
* it contains no parasite information
*/
memset(resp, 0, sizeof(struct nfs_resop4));
resp->resop = NFS4_OP_PUTROOTFH;
/* Release any old export reference */
if (op_ctx->ctx_export != NULL)
put_gsh_export(op_ctx->ctx_export);
op_ctx->ctx_export = NULL;
op_ctx->fsal_export = NULL;
/* Clear out current entry for now */
set_current_entry(data, NULL);
/* Get the root export of the Pseudo FS */
op_ctx->ctx_export = get_gsh_export_by_pseudo("/", true);
if (op_ctx->ctx_export == NULL) {
LogCrit(COMPONENT_EXPORT,
"Could not get export for Pseudo Root");
res_PUTROOTFH4->status = NFS4ERR_NOENT;
return res_PUTROOTFH4->status;
}
op_ctx->fsal_export = op_ctx->ctx_export->fsal_export;
/* Build credentials */
res_PUTROOTFH4->status = nfs4_export_check_access(data->req);
/* Test for access error (export should not be visible). */
if (res_PUTROOTFH4->status == NFS4ERR_ACCESS) {
/* Client has no access at all */
LogDebug(COMPONENT_EXPORT,
"Client doesn't have access to Pseudo Root");
return res_PUTROOTFH4->status;
}
if (res_PUTROOTFH4->status != NFS4_OK) {
LogMajor(COMPONENT_EXPORT,
"Failed to get FSAL credentials Pseudo Root");
return res_PUTROOTFH4->status;
}
/* Get the Pesudo Root inode of the mounted on export */
status = nfs_export_get_root_entry(op_ctx->ctx_export, &file_obj);
if (FSAL_IS_ERROR(status)) {
LogCrit(COMPONENT_EXPORT,
"Could not get root inode for Pseudo Root");
res_PUTROOTFH4->status = nfs4_Errno_status(status);
return res_PUTROOTFH4->status;
}
LogMidDebug(COMPONENT_EXPORT,
"Root node %p", data->current_obj);
set_current_entry(data, file_obj);
/* Put our ref */
file_obj->obj_ops.put_ref(file_obj);
/* Convert it to a file handle */
if (!nfs4_FSALToFhandle(data->currentFH.nfs_fh4_val == NULL,
&data->currentFH,
data->current_obj,
op_ctx->ctx_export)) {
LogCrit(COMPONENT_EXPORT,
"Could not get handle for Pseudo Root");
res_PUTROOTFH4->status = NFS4ERR_SERVERFAULT;
return res_PUTROOTFH4->status;
}
LogHandleNFS4("NFS4 PUTROOTFH CURRENT FH: ", &data->currentFH);
res_PUTROOTFH4->status = NFS4_OK;
return res_PUTROOTFH4->status;
} /* nfs4_op_putrootfh */
int nfs4_op_lookup(struct nfs_argop4 *op, compound_data_t *data,
struct nfs_resop4 *resp)
{
/* Convenient alias for the arguments */
LOOKUP4args * const arg_LOOKUP4 = &op->nfs_argop4_u.oplookup;
/* Convenient alias for the response */
LOOKUP4res * const res_LOOKUP4 = &resp->nfs_resop4_u.oplookup;
/* The name to look up */
char *name = NULL;
/* The directory in which to look up the name */
struct fsal_obj_handle *dir_obj = NULL;
/* The name found */
struct fsal_obj_handle *file_obj = NULL;
/* Status code from fsal */
fsal_status_t status = {0, 0};
resp->resop = NFS4_OP_LOOKUP;
res_LOOKUP4->status = NFS4_OK;
/* Do basic checks on a filehandle */
res_LOOKUP4->status = nfs4_sanity_check_FH(data, DIRECTORY, false);
if (res_LOOKUP4->status != NFS4_OK) {
/* for some reason lookup is picky. Just not being
* dir is not enough. We want to know it is a symlink
*/
if (res_LOOKUP4->status == NFS4ERR_NOTDIR
&& data->current_filetype == SYMBOLIC_LINK)
res_LOOKUP4->status = NFS4ERR_SYMLINK;
goto out;
}
/* Validate and convert the UFT8 objname to a regular string */
res_LOOKUP4->status = nfs4_utf8string2dynamic(&arg_LOOKUP4->objname,
UTF8_SCAN_ALL,
&name);
if (res_LOOKUP4->status != NFS4_OK)
goto out;
LogDebug(COMPONENT_NFS_V4, "name=%s", name);
/* Do the lookup in the FSAL */
file_obj = NULL;
dir_obj = data->current_obj;
/* Sanity check: dir_obj should be ACTUALLY a directory */
status = fsal_lookup(dir_obj, name, &file_obj, NULL);
if (FSAL_IS_ERROR(status)) {
res_LOOKUP4->status = nfs4_Errno_status(status);
goto out;
}
if (file_obj->type == DIRECTORY) {
PTHREAD_RWLOCK_rdlock(&file_obj->state_hdl->state_lock);
if (file_obj->state_hdl->dir.junction_export != NULL) {
/* Handle junction */
struct fsal_obj_handle *obj = NULL;
/* Attempt to get a reference to the export across the
* junction.
*/
if (!export_ready(
file_obj->state_hdl->dir.junction_export)) {
/* If we could not get a reference, return
* stale. Release state_lock
*/
LogDebug(COMPONENT_EXPORT,
"NFS4ERR_STALE on LOOKUP of %s", name);
res_LOOKUP4->status = NFS4ERR_STALE;
PTHREAD_RWLOCK_unlock(
&file_obj->state_hdl->state_lock);
goto out;
}
get_gsh_export_ref(
file_obj->state_hdl->dir.junction_export);
/* Release any old export reference */
if (op_ctx->ctx_export != NULL)
put_gsh_export(op_ctx->ctx_export);
/* Stash the new export in the compound data. */
op_ctx->ctx_export =
file_obj->state_hdl->dir.junction_export;
op_ctx->fsal_export = op_ctx->ctx_export->fsal_export;
PTHREAD_RWLOCK_unlock(&file_obj->state_hdl->state_lock);
/* Build credentials */
res_LOOKUP4->status =
nfs4_export_check_access(data->req);
/* Test for access error (export should not be visible).
*/
if (res_LOOKUP4->status == NFS4ERR_ACCESS) {
/* If return is NFS4ERR_ACCESS then this client
* doesn't have access to this export, return
* NFS4ERR_NOENT to hide it. It was not visible
* in READDIR response.
*/
LogDebug(COMPONENT_EXPORT,
"NFS4ERR_ACCESS Hiding Export_Id %d Pseudo %s with NFS4ERR_NOENT",
op_ctx->ctx_export->export_id,
op_ctx->ctx_export->pseudopath);
res_LOOKUP4->status = NFS4ERR_NOENT;
goto out;
}
if (res_LOOKUP4->status == NFS4ERR_WRONGSEC) {
/* LogInfo already documents why */
goto out;
}
if (res_LOOKUP4->status != NFS4_OK) {
/* Should never get here,
* nfs4_export_check_access can only return
* NFS4_OK, NFS4ERR_ACCESS or NFS4ERR_WRONGSEC.
*/
LogMajor(COMPONENT_EXPORT,
"PSEUDO FS JUNCTION TRAVERSAL: Failed with %s for %s, id=%d",
nfsstat4_to_str(res_LOOKUP4->status),
op_ctx->ctx_export->pseudopath,
op_ctx->ctx_export->export_id);
goto out;
}
status = nfs_export_get_root_entry(op_ctx->ctx_export,
&obj);
if (FSAL_IS_ERROR(status)) {
LogMajor(COMPONENT_EXPORT,
"PSEUDO FS JUNCTION TRAVERSAL: Failed to get root for %s, id=%d, status = %s",
op_ctx->ctx_export->pseudopath,
op_ctx->ctx_export->export_id,
msg_fsal_err(status.major));
res_LOOKUP4->status = nfs4_Errno_status(status);
goto out;
}
LogDebug(COMPONENT_EXPORT,
"PSEUDO FS JUNCTION TRAVERSAL: Crossed to %s, id=%d for name=%s",
op_ctx->ctx_export->pseudopath,
op_ctx->ctx_export->export_id, name);
file_obj->obj_ops->put_ref(file_obj);
file_obj = obj;
} else {
PTHREAD_RWLOCK_unlock(&file_obj->state_hdl->state_lock);
}
}
/* Convert it to a file handle */
if (!nfs4_FSALToFhandle(false, &data->currentFH, file_obj,
op_ctx->ctx_export)) {
res_LOOKUP4->status = NFS4ERR_SERVERFAULT;
goto out;
}
/* Keep the pointer within the compound data */
set_current_entry(data, file_obj);
/* Put our ref */
file_obj->obj_ops->put_ref(file_obj);
file_obj = NULL;
/* Return successfully */
res_LOOKUP4->status = NFS4_OK;
out:
/* Release reference on file_obj if we didn't utilze it. */
if (file_obj)
file_obj->obj_ops->put_ref(file_obj);
gsh_free(name);
return res_LOOKUP4->status;
} /* nfs4_op_lookup */
/**
* @brief NFS4_OP_LOOKUPP
*
* This function implements the NFS4_OP_LOOKUPP operation, which looks
* up the parent of the supplied directory.
*
* @param[in] op Arguments for nfs4_op
* @param[in,out] data Compound request's data
* @param[out] resp Results for nfs4_op
*
* @return per RFC5661, p. 369
*
*/
int nfs4_op_lookupp(struct nfs_argop4 *op, compound_data_t *data,
struct nfs_resop4 *resp)
{
LOOKUPP4res * const res_LOOKUPP4 = &resp->nfs_resop4_u.oplookupp;
struct fsal_obj_handle *dir_obj = NULL;
struct fsal_obj_handle *file_obj;
struct fsal_obj_handle *root_obj;
fsal_status_t status;
struct gsh_export *original_export = op_ctx->ctx_export;
resp->resop = NFS4_OP_LOOKUPP;
res_LOOKUPP4->status = NFS4_OK;
/* Do basic checks on a filehandle */
res_LOOKUPP4->status = nfs4_sanity_check_FH(data, DIRECTORY, false);
if (res_LOOKUPP4->status != NFS4_OK)
return res_LOOKUPP4->status;
/* Preparing for cache_inode_lookup ".." */
file_obj = NULL;
dir_obj = data->current_obj;
/* If Filehandle points to the root of the current export, then backup
* through junction into the containing export.
*/
if (data->current_obj->type != DIRECTORY)
goto not_junction;
PTHREAD_RWLOCK_rdlock(&original_export->lock);
status = nfs_export_get_root_entry(original_export, &root_obj);
if (FSAL_IS_ERROR(status)) {
res_LOOKUPP4->status = nfs4_Errno_status(status);
PTHREAD_RWLOCK_unlock(&original_export->lock);
return res_LOOKUPP4->status;
}
if (data->current_obj == root_obj) {
struct gsh_export *parent_exp = NULL;
/* Handle reverse junction */
LogDebug(COMPONENT_EXPORT,
"Handling reverse junction from Export_Id %d Path %s Parent=%p",
original_export->export_id,
original_export->fullpath,
original_export->exp_parent_exp);
if (original_export->exp_parent_exp == NULL) {
/* lookupp on the root on the pseudofs should return
* NFS4ERR_NOENT (RFC3530, page 166)
*/
PTHREAD_RWLOCK_unlock(&original_export->lock);
res_LOOKUPP4->status = NFS4ERR_NOENT;
return res_LOOKUPP4->status;
}
PTHREAD_RWLOCK_unlock(&original_export->lock);
/* Clear out data->current entry outside lock
* so if it cascades into cleanup, we aren't holding
* an export lock that would cause trouble.
*/
set_current_entry(data, NULL);
/* We need to protect accessing the parent information
* with the export lock. We use the current export's lock
* which is plenty, the parent can't go away without
* grabbing the current export's lock to clean out the
* parent information.
*/
PTHREAD_RWLOCK_rdlock(&original_export->lock);
/* Get the junction inode into dir_obj and parent_exp
* for reference.
*/
dir_obj = original_export->exp_junction_obj;
parent_exp = original_export->exp_parent_exp;
/* Check if there is a problem with the export and try and
* get a reference to the parent export.
*/
if (dir_obj == NULL || parent_exp == NULL ||
!export_ready(parent_exp)) {
/* Export is in the process of dying */
PTHREAD_RWLOCK_unlock(&original_export->lock);
LogCrit(COMPONENT_EXPORT,
"Reverse junction from Export_Id %d Path %s Parent=%p is stale",
original_export->export_id,
original_export->fullpath,
parent_exp);
res_LOOKUPP4->status = NFS4ERR_STALE;
return res_LOOKUPP4->status;
}
get_gsh_export_ref(parent_exp);
dir_obj->obj_ops.get_ref(dir_obj);
/* Set up dir_obj as current obj with an LRU reference
* while still holding the lock.
*/
set_current_entry(data, dir_obj);
/* Put our ref */
dir_obj->obj_ops.put_ref(dir_obj);
/* Stash parent export in opctx while still holding the lock.
*/
op_ctx->ctx_export = parent_exp;
op_ctx->fsal_export = op_ctx->ctx_export->fsal_export;
/* Now we are safely transitioned to the parent export and can
* release the lock.
*/
PTHREAD_RWLOCK_unlock(&original_export->lock);
/* Release old export reference that was held by opctx. */
put_gsh_export(original_export);
/* Build credentials */
res_LOOKUPP4->status = nfs4_export_check_access(data->req);
/* Test for access error (export should not be visible). */
if (res_LOOKUPP4->status == NFS4ERR_ACCESS) {
/* If return is NFS4ERR_ACCESS then this client doesn't
* have access to this export, return NFS4ERR_NOENT to
* hide it. It was not visible in READDIR response.
*/
LogDebug(COMPONENT_EXPORT,
"NFS4ERR_ACCESS Hiding Export_Id %d Path %s with NFS4ERR_NOENT",
parent_exp->export_id,
parent_exp->fullpath);
res_LOOKUPP4->status = NFS4ERR_NOENT;
return res_LOOKUPP4->status;
}
} else {
/* Release the lock taken above */
PTHREAD_RWLOCK_unlock(&original_export->lock);
}
/* Return our ref from above */
root_obj->obj_ops.put_ref(root_obj);
not_junction:
status = fsal_lookupp(dir_obj, &file_obj, NULL);
if (file_obj != NULL) {
/* Convert it to a file handle */
if (!nfs4_FSALToFhandle(false, &data->currentFH,
file_obj,
op_ctx->ctx_export)) {
res_LOOKUPP4->status = NFS4ERR_SERVERFAULT;
file_obj->obj_ops.put_ref(file_obj);
return res_LOOKUPP4->status;
}
/* Keep the pointer within the compound data */
set_current_entry(data, file_obj);
/* Put our ref */
file_obj->obj_ops.put_ref(file_obj);
/* Return successfully */
res_LOOKUPP4->status = NFS4_OK;
} else {
/* Unable to look up parent for some reason.
* Return error.
*/
set_current_entry(data, NULL);
res_LOOKUPP4->status = nfs4_Errno_status(status);
}
return res_LOOKUPP4->status;
} /* nfs4_op_lookupp */
