affc2a2b70
Description: Changed H5G_mkroot to be tolerant of files with symbol table information cached but no symbol table in the root group. Also changed H5G_mkroot to properly clean up in case of an error, and changed H5G_stab_is_valid to properly detect errors in H5O_msg_read. Tested: jam, linew, smirom (h5committest), jam (--disable-strict-format-checks)
369 lines
14 KiB
C
369 lines
14 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*-------------------------------------------------------------------------
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*
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* Created: H5Gobj.c
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* Apr 8 2009
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* Neil Fortner <nfortne2@hdfgroup.org>
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*
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* Purpose: Functions for operating on the root group.
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*
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*-------------------------------------------------------------------------
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*/
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/****************/
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/* Module Setup */
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/****************/
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#define H5F_PACKAGE /*suppress error about including H5Fpkg */
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#define H5G_PACKAGE /*suppress error about including H5Gpkg */
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/***********/
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/* Headers */
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/***********/
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#include "H5private.h" /* Generic Functions */
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#include "H5Eprivate.h" /* Error handling */
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#include "H5Fpkg.h" /* File access */
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#include "H5Gpkg.h" /* Groups */
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#include "H5Iprivate.h" /* IDs */
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#include "H5MMprivate.h" /* Memory management */
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#include "H5Pprivate.h" /* Property Lists */
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/*-------------------------------------------------------------------------
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* Function: H5G_rootof
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*
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* Purpose: Return a pointer to the root group of the file. If the file
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* is part of a virtual file then the root group of the virtual
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* file is returned.
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*
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* Return: Success: Ptr to the root group of the file. Do not
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* free the pointer -- it points directly into
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* the file struct.
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*
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* Failure: NULL
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*
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* Programmer: Robb Matzke
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* Tuesday, October 13, 1998
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*
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*-------------------------------------------------------------------------
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*/
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H5G_t *
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H5G_rootof(H5F_t *f)
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{
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FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_rootof)
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while(f->parent)
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f = f->parent;
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FUNC_LEAVE_NOAPI(f->shared->root_grp)
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} /* end H5G_rootof() */
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/*-------------------------------------------------------------------------
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* Function: H5G_root_ent_decode
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*
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* Purpose: Decodes the root group symbol table entry into the file
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* structure, and updates the root group address in the file
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* structure.
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*
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* Return: Success: Non-negative with *pp pointing to the first byte
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* following the symbol table entry.
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*
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* Failure: Negative
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*
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* Programmer: Quincey Koziol
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* koziol@ncsa.uiuc.edu
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* Sep 26 2005
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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H5G_root_ent_decode(H5F_t *f, const uint8_t **pp)
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{
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const uint8_t *p_ret = *pp + H5G_SIZEOF_ENTRY(f);
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herr_t ret_value = SUCCEED; /* Return value */
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FUNC_ENTER_NOAPI(H5G_root_ent_decode, FAIL)
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/* check arguments */
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HDassert(f);
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HDassert(pp);
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/* Allocate space for the root group symbol table entry */
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HDassert(!f->shared->root_ent);
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if(NULL == (f->shared->root_ent = (H5G_entry_t *) H5MM_calloc(sizeof(H5G_entry_t))))
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HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "can't allocate space for symbol table entry")
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/* decode the root group symbol table entry */
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if(H5G_ent_decode_vec(f, pp, f->shared->root_ent, 1) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTDECODE, FAIL, "can't decode symbol table entry")
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/* Set the root group address to the correct value */
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f->shared->root_addr = f->shared->root_ent->header;
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/* Set decode pointer */
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*pp = p_ret;
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done:
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FUNC_LEAVE_NOAPI(ret_value)
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} /* end H5G_root_ent_decode() */
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/*-------------------------------------------------------------------------
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* Function: H5G_root_ent_encode
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*
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* Purpose: Encodes the root group symbol table entry into the buffer
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* pointed to by *pp.
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*
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* Return: Success: Non-negative, with *pp pointing to the first byte
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* after the symbol table entry.
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*
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* Failure: Negative
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*
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* Programmer: Quincey Koziol
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* koziol@ncsa.uiuc.edu
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* Sep 26 2005
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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H5G_root_ent_encode(H5F_t *f, uint8_t **pp)
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{
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uint8_t *p_ret = *pp + H5G_SIZEOF_ENTRY(f);
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herr_t ret_value = SUCCEED; /* Return value */
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FUNC_ENTER_NOAPI(H5G_root_ent_encode, FAIL)
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/* check arguments */
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HDassert(f);
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HDassert(f->shared);
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HDassert(f->shared->root_ent);
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HDassert(pp);
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/* Encode entry */
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if(H5G_ent_encode_vec(f, pp, f->shared->root_ent, 1) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTENCODE, FAIL, "can't encode symbol table entry")
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/* Set encode pointer */
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*pp = p_ret;
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done:
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FUNC_LEAVE_NOAPI(ret_value)
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} /* end H5G_root_ent_encode() */
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/*-------------------------------------------------------------------------
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* Function: H5G_mkroot
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*
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* Purpose: Creates a root group in an empty file and opens it. If a
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* root group is already open then this function immediately
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* returns. If ENT is non-null then it's the symbol table
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* entry for an existing group which will be opened as the root
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* group. Otherwise a new root group is created and then
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* opened.
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*
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* Return: Non-negative on success/Negative on failure
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*
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* Programmer: Robb Matzke
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* matzke@llnl.gov
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* Aug 11 1997
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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H5G_mkroot(H5F_t *f, hid_t dxpl_id, hbool_t create_root)
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{
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H5G_loc_t root_loc; /* Root location information */
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htri_t stab_exists = -1; /* Whether the symbol table exists */
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herr_t ret_value = SUCCEED; /* Return value */
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FUNC_ENTER_NOAPI(H5G_mkroot, FAIL)
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/* check args */
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HDassert(f);
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/* Check if the root group is already initialized */
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if(f->shared->root_grp)
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HGOTO_DONE(SUCCEED)
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/* Create information needed for group nodes */
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if(H5G_node_init(f) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group node info")
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/*
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* Create the group pointer
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*/
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if(NULL == (f->shared->root_grp = H5FL_CALLOC(H5G_t)))
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HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
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if(NULL == (f->shared->root_grp->shared = H5FL_CALLOC(H5G_shared_t))) {
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(void)H5FL_FREE(H5G_t, f->shared->root_grp);
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HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
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} /* end if */
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/* Initialize the root_loc structure to point to fields in the newly created
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* f->shared->root_grp structure */
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root_loc.oloc = &(f->shared->root_grp->oloc);
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root_loc.path = &(f->shared->root_grp->path);
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H5G_loc_reset(&root_loc);
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/*
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* If there is no root object then create one. The root group always starts
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* with a hard link count of one since it's pointed to by the superblock.
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*/
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if(create_root) {
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H5P_genplist_t *fc_plist; /* File creation property list */
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H5O_ginfo_t ginfo; /* Group info parameters */
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H5O_linfo_t linfo; /* Link info parameters */
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unsigned super_vers; /* Superblock version */
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/* Get the file creation property list */
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/* (Which is a sub-class of the group creation property class) */
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if(NULL == (fc_plist = (H5P_genplist_t *)H5I_object(f->shared->fcpl_id)))
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HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
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/* Get the group info property */
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if(H5P_get(fc_plist, H5G_CRT_GROUP_INFO_NAME, &ginfo) < 0)
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HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get group info")
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/* Get the link info property */
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if(H5P_get(fc_plist, H5G_CRT_LINK_INFO_NAME, &linfo) < 0)
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HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get link info")
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/* Get the superblock version */
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if(H5P_get(fc_plist, H5F_CRT_SUPER_VERS_NAME, &super_vers) < 0)
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HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get superblock version")
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/* Create root group */
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if(H5G_obj_create(f, dxpl_id, &ginfo, &linfo, f->shared->fcpl_id, root_loc.oloc/*out*/) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group entry")
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if(1 != H5O_link(root_loc.oloc, 1, dxpl_id))
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HGOTO_ERROR(H5E_SYM, H5E_LINKCOUNT, FAIL, "internal error (wrong link count)")
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/* Create the root group symbol table entry */
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HDassert(!f->shared->root_ent);
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if(super_vers < HDF5_SUPERBLOCK_VERSION_2) {
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/* Allocate space for the root group symbol table entry */
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if(NULL == (f->shared->root_ent = (H5G_entry_t *) H5MM_calloc(sizeof(H5G_entry_t))))
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HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "can't allocate space for symbol table entry")
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/* Initialize the root group symbol table entry */
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f->shared->root_ent->dirty = TRUE;
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f->shared->root_ent->type = H5G_NOTHING_CACHED; /* We will cache the stab later */
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f->shared->root_ent->name_off = 0; /* No name (yet) */
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f->shared->root_ent->header = root_loc.oloc->addr;
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f->shared->root_ent->file = root_loc.oloc->file;
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} /* end if */
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} /* end if */
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else {
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/* Create root group object location from f */
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root_loc.oloc->addr = f->shared->root_addr;
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root_loc.oloc->file = f;
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/*
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* Open the root object as a group.
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*/
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if(H5O_open(root_loc.oloc) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open root group")
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/* Actions to take if the symbol table information is cached */
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if(f->shared->root_ent && f->shared->root_ent->type == H5G_CACHED_STAB) {
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/* Check for the situation where the symbol table is cached but does
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* not exist. This can happen if, for example, an external link is
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* added to the root group. */
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if((stab_exists = H5O_msg_exists(root_loc.oloc, H5O_STAB_ID, dxpl_id)) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't check if symbol table message exists")
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/* Remove the cache if the stab does not exist */
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if(!stab_exists)
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f->shared->root_ent->type = H5G_NOTHING_CACHED;
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#ifndef H5_STRICT_FORMAT_CHECKS
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/* If symbol table information is cached, check if we should replace the
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* symbol table message with the cached symbol table information */
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else if(H5F_INTENT(f) & H5F_ACC_RDWR) {
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H5O_stab_t cached_stab;
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/* Retrieve the cached symbol table information */
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cached_stab.btree_addr = f->shared->root_ent->cache.stab.btree_addr;
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cached_stab.heap_addr = f->shared->root_ent->cache.stab.heap_addr;
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/* Check if the symbol table message is valid, and replace with the
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* cached symbol table if necessary */
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if(H5G_stab_valid(root_loc.oloc, dxpl_id, &cached_stab) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "unable to verify symbol table")
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} /* end if */
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#endif /* H5_STRICT_FORMAT_CHECKS */
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} /* end if */
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} /* end else */
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/* Cache the root group's symbol table information in the root group symbol
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* table entry. It will have been allocated by now if it needs to be
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* present, so we don't need to check the superblock version. We do this if
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* we have write access, the root entry has been allocated (i.e.
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* super_vers < 2) and the stab info is not already cached. */
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if((H5F_INTENT(f) & H5F_ACC_RDWR) && stab_exists != FALSE && f->shared->root_ent
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&& f->shared->root_ent->type != H5G_CACHED_STAB) {
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H5O_stab_t stab; /* Symbol table */
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/* Check if the stab message exists. It's possible for the root group
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* to use the latest version while the superblock is an old version.
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* If stab_exists is not -1 then we have already checked. */
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if(stab_exists == -1 && (stab_exists = H5O_msg_exists(root_loc.oloc, H5O_STAB_ID, dxpl_id)) < 0)
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HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't check if symbol table message exists")
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if(stab_exists) {
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/* Read the root group's symbol table message */
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if(NULL == H5O_msg_read(root_loc.oloc, H5O_STAB_ID, &stab, dxpl_id))
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HGOTO_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "unable to read symbol table message")
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/* Update the root group symbol table entry */
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f->shared->root_ent->type = H5G_CACHED_STAB;
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f->shared->root_ent->cache.stab.btree_addr = stab.btree_addr;
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f->shared->root_ent->cache.stab.heap_addr = stab.heap_addr;
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} /* end if */
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} /* end if */
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/* Create the path names for the root group's entry */
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H5G_name_init(root_loc.path, "/");
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f->shared->root_grp->shared->fo_count = 1;
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/* The only other open object should be the superblock extension, if it
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* exists. Don't count either the superblock extension or the root group
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* in the number of open objects in the file.
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*/
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HDassert((1 == f->nopen_objs) ||
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(2 == f->nopen_objs && HADDR_UNDEF != f->shared->extension_addr));
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f->nopen_objs--;
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done:
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/* In case of error, free various memory locations that may have been
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* allocated */
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if(ret_value < 0) {
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if(f->shared->root_grp) {
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if(f->shared->root_grp->shared)
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f->shared->root_grp->shared = H5FL_FREE(H5G_shared_t, f->shared->root_grp->shared);
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f->shared->root_grp = H5FL_FREE(H5G_t, f->shared->root_grp);
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} /* end if */
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f->shared->root_ent = (H5G_entry_t *) H5MM_xfree(f->shared->root_ent);
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H5G_name_free(root_loc.path);
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} /* end if */
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FUNC_LEAVE_NOAPI(ret_value)
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} /* end H5G_mkroot() */
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