321 lines
9.2 KiB
C
Executable File
321 lines
9.2 KiB
C
Executable File
/* libparted - a library for manipulating disk partitions
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Copyright (C) 1999-2001, 2007-2014, 2019-2023 Free Software Foundation,
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Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file filesys.c */
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/**
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* \addtogroup PedFileSystem
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*
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* \note File systems exist on a PedGeometry - NOT a PedPartition.
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*
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* @{
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*/
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#include <config.h>
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#include <parted/parted.h>
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#include <parted/debug.h>
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#include "pt-tools.h"
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#if ENABLE_NLS
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# include <libintl.h>
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# define _(String) dgettext (PACKAGE, String)
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#else
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# define _(String) (String)
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#endif /* ENABLE_NLS */
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#define STREQ(a, b) (strcmp (a, b) == 0)
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#ifndef MIN
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# define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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typedef PedFileSystem * (*open_fn_t) (PedGeometry *);
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extern PedFileSystem *hfsplus_open (PedGeometry *);
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extern PedFileSystem *hfs_open (PedGeometry *);
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extern PedFileSystem *fat_open (PedGeometry *);
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typedef int (*close_fn_t) (PedFileSystem *);
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extern int hfsplus_close (PedFileSystem *);
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extern int hfs_close (PedFileSystem *);
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extern int fat_close (PedFileSystem *);
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typedef int (*resize_fn_t) (PedFileSystem *fs, PedGeometry *geom,
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PedTimer *timer);
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extern int hfsplus_resize (PedFileSystem *fs, PedGeometry *geom,
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PedTimer *timer);
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extern int hfs_resize (PedFileSystem *fs, PedGeometry *geom,
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PedTimer *timer);
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extern int fat_resize (PedFileSystem *fs, PedGeometry *geom,
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PedTimer *timer);
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typedef PedConstraint * (*resize_constraint_fn_t) (PedFileSystem const *fs);
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extern PedConstraint *hfsplus_get_resize_constraint (PedFileSystem const *fs);
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extern PedConstraint *hfs_get_resize_constraint (PedFileSystem const *fs);
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extern PedConstraint *fat_get_resize_constraint (PedFileSystem const *fs);
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static bool
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is_hfs_plus (char const *fs_type_name)
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{
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return STREQ (fs_type_name, "hfsx") || STREQ (fs_type_name, "hfs+");
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}
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static open_fn_t
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open_fn (char const *fs_type_name)
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{
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if (is_hfs_plus (fs_type_name))
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return hfsplus_open;
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if (STREQ (fs_type_name, "hfs"))
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return hfs_open;
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if (strncmp (fs_type_name, "fat", 3) == 0)
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return fat_open;
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return NULL;
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}
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static close_fn_t
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close_fn (char const *fs_type_name)
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{
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if (is_hfs_plus (fs_type_name))
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return hfsplus_close;
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if (STREQ (fs_type_name, "hfs"))
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return hfs_close;
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if (strncmp (fs_type_name, "fat", 3) == 0)
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return fat_close;
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return NULL;
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}
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static resize_fn_t
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resize_fn (char const *fs_type_name)
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{
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if (is_hfs_plus (fs_type_name))
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return hfsplus_resize;
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if (STREQ (fs_type_name, "hfs"))
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return hfs_resize;
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if (strncmp (fs_type_name, "fat", 3) == 0)
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return fat_resize;
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return NULL;
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}
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static resize_constraint_fn_t
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resize_constraint_fn (char const *fs_type_name)
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{
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if (is_hfs_plus (fs_type_name))
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return hfsplus_get_resize_constraint;
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if (STREQ (fs_type_name, "hfs"))
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return hfs_get_resize_constraint;
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if (strncmp (fs_type_name, "fat", 3) == 0)
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return fat_get_resize_constraint;
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return NULL;
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}
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/**
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* This function opens the file system stored on \p geom, if it
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* can find one.
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* It is often called in the following manner:
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* \code
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* fs = ped_file_system_open (&part.geom)
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* \endcode
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*
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* \throws PED_EXCEPTION_ERROR if file system could not be detected
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* \throws PED_EXCEPTION_ERROR if the file system is bigger than its volume
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* \throws PED_EXCEPTION_NO_FEATURE if opening of a file system stored on
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* \p geom is not implemented
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*
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* \return a PedFileSystem on success, \c NULL on failure.
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*/
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PedFileSystem *
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ped_file_system_open (PedGeometry* geom)
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{
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PED_ASSERT (geom != NULL);
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if (!ped_device_open (geom->dev))
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goto error;
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PedFileSystemType *type = ped_file_system_probe (geom);
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if (!type) {
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ped_exception_throw (PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
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_("Could not detect file system."));
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goto error_close_dev;
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}
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open_fn_t open_f = open_fn (type->name);
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if (open_f == NULL) {
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ped_exception_throw (PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
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_("resizing %s file systems is not supported"),
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type->name);
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goto error_close_dev;
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}
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PedGeometry *probed_geom = ped_file_system_probe_specific (type, geom);
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if (!probed_geom)
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goto error_close_dev;
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if (!ped_geometry_test_inside (geom, probed_geom)) {
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if (ped_exception_throw (
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PED_EXCEPTION_ERROR,
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PED_EXCEPTION_IGNORE_CANCEL,
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_("The file system is bigger than its volume!"))
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!= PED_EXCEPTION_IGNORE)
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goto error_destroy_probed_geom;
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}
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PedFileSystem *fs = (*open_f) (probed_geom);
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if (!fs)
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goto error_destroy_probed_geom;
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ped_geometry_destroy (probed_geom);
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fs->type = type;
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return fs;
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error_destroy_probed_geom:
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ped_geometry_destroy (probed_geom);
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error_close_dev:
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ped_device_close (geom->dev);
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error:
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return NULL;
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}
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/**
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* Close file system \p fs.
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*
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* \return \c 1 on success, \c 0 on failure
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*/
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int
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ped_file_system_close (PedFileSystem* fs)
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{
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PED_ASSERT (fs != NULL);
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PedDevice *dev = fs->geom->dev;
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close_fn_t fn = close_fn (fs->type->name);
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if (!fn || !(fn (fs)))
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goto error_close_dev;
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ped_device_close (dev);
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return 1;
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error_close_dev:
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ped_device_close (dev);
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return 0;
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}
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/**
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* This function erases all file system signatures that indicate that a
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* file system occupies a given region described by \p geom.
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* After this operation ped_file_system_probe() won't detect any file system.
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*
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* \return \c 1 on success, \c 0 on failure
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*/
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static int
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ped_file_system_clobber (PedGeometry* geom)
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{
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PED_ASSERT (geom != NULL);
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if (!ped_device_open (geom->dev))
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return 0;
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/* Clear the first three and the last two sectors, albeit fewer
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when GEOM is too small. */
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PedSector len = MIN (geom->length, geom->dev->length);
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int ok = (len <= 5
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? ptt_geom_clear_sectors (geom, 0, len)
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: (ptt_geom_clear_sectors (geom, 0, 3)
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&& ptt_geom_clear_sectors (geom, geom->dev->length - 2, 2)));
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ped_device_close (geom->dev);
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return !!ok;
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}
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/* This function erases all signatures that indicate the presence of
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* a file system in a particular region, without erasing any data
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* contained inside the "exclude" region.
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*/
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static int
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ped_file_system_clobber_exclude (PedGeometry* geom,
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const PedGeometry* exclude)
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{
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PedGeometry* clobber_geom;
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int status;
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if (ped_geometry_test_sector_inside (exclude, geom->start))
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return 1;
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clobber_geom = ped_geometry_duplicate (geom);
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if (ped_geometry_test_overlap (clobber_geom, exclude))
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ped_geometry_set_end (clobber_geom, exclude->start - 1);
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status = ped_file_system_clobber (clobber_geom);
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ped_geometry_destroy (clobber_geom);
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return status;
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}
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/**
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* Resize \p fs to new geometry \p geom.
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*
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* \p geom should satisfy the ped_file_system_get_resize_constraint().
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* (This isn't asserted, so it's not a bug not to... just it's likely
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* to fail ;) If \p timer is non-NULL, it is used as the progress meter.
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*
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* \throws PED_EXCEPTION_NO_FEATURE if resizing of file system \p fs
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* is not implemented yet
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*
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* \return \c 0 on failure
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*/
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int
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ped_file_system_resize (PedFileSystem *fs, PedGeometry *geom, PedTimer *timer)
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{
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PED_ASSERT (fs != NULL);
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PED_ASSERT (geom != NULL);
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resize_fn_t resize_f = resize_fn (fs->type->name);
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if (resize_f == NULL) {
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ped_exception_throw (PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
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_("resizing %s file systems is not supported"),
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fs->type->name);
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return 0;
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}
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if (!ped_file_system_clobber_exclude (geom, fs->geom))
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return 0;
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return resize_f (fs, geom, timer);
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}
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/**
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* Return a constraint that represents all of the possible ways the
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* file system \p fs can be resized with ped_file_system_resize().
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* This takes into account the amount of used space on
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* the filesystem \p fs and the capabilities of the resize algorithm.
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* Hints:
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* -# if constraint->start_align->grain_size == 0, or
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* constraint->start_geom->length == 1, then the start cannot be moved
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* -# constraint->min_size is the minimum size you can resize the partition
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* to. You might want to tell the user this ;-).
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*
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* \return a PedConstraint on success, \c NULL on failure
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*/
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PedConstraint *
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ped_file_system_get_resize_constraint (const PedFileSystem *fs)
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{
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PED_ASSERT (fs != NULL);
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resize_constraint_fn_t resize_constraint_f =
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resize_constraint_fn (fs->type->name);
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if (resize_constraint_f == NULL)
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return NULL;
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return resize_constraint_f (fs);
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}
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