2002-12-27 08:53:07 +00:00
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/* fs.c - filesystem manager */
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/*
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* PUPA -- Preliminary Universal Programming Architecture for GRUB
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2004-02-24 17:21:53 +00:00
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* Copyright (C) 2002 Free Software Foundation, Inc.
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2002-12-27 08:53:07 +00:00
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*
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* PUPA 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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License
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* along with PUPA; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <pupa/disk.h>
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#include <pupa/net.h>
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#include <pupa/fs.h>
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#include <pupa/file.h>
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#include <pupa/err.h>
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#include <pupa/misc.h>
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#include <pupa/types.h>
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#include <pupa/mm.h>
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#include <pupa/term.h>
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static pupa_fs_t pupa_fs_list;
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void
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pupa_fs_register (pupa_fs_t fs)
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{
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fs->next = pupa_fs_list;
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pupa_fs_list = fs;
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}
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void
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pupa_fs_unregister (pupa_fs_t fs)
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{
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pupa_fs_t *p, q;
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for (p = &pupa_fs_list, q = *p; q; p = &(q->next), q = q->next)
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if (q == fs)
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{
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*p = q->next;
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break;
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}
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}
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void
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pupa_fs_iterate (int (*hook) (const pupa_fs_t fs))
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{
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pupa_fs_t p;
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for (p = pupa_fs_list; p; p = p->next)
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if (hook (p))
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break;
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}
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pupa_fs_t
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pupa_fs_probe (pupa_device_t device)
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{
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pupa_fs_t p;
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auto int dummy_func (const char *filename, int dir);
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int dummy_func (const char *filename __attribute__ ((unused)),
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int dir __attribute__ ((unused)))
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{
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return 1;
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}
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if (device->disk)
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{
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for (p = pupa_fs_list; p; p = p->next)
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{
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(p->dir) (device, "/", dummy_func);
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if (pupa_errno == PUPA_ERR_NONE)
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return p;
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if (pupa_errno != PUPA_ERR_BAD_FS)
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return 0;
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pupa_errno = PUPA_ERR_NONE;
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}
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}
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else if (device->net->fs)
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return device->net->fs;
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pupa_error (PUPA_ERR_UNKNOWN_FS, "unknown filesystem");
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return 0;
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}
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/* Block list support routines. */
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struct pupa_fs_block
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{
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unsigned long offset;
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unsigned long length;
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};
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static pupa_err_t
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pupa_fs_blocklist_open (pupa_file_t file, const char *name)
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{
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char *p = (char *) name;
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unsigned num = 0;
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unsigned i;
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pupa_disk_t disk = file->device->disk;
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struct pupa_fs_block *blocks;
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/* First, count the number of blocks. */
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do
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{
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num++;
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p = pupa_strchr (p, ',');
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}
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while (p);
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/* Allocate a block list. */
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blocks = pupa_malloc (sizeof (struct pupa_fs_block) * (num + 1));
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if (! blocks)
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return 0;
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file->size = 0;
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p = (char *) name;
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for (i = 0; i < num; i++)
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{
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if (*p != '+')
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{
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blocks[i].offset = pupa_strtoul (p, &p, 0);
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if (pupa_errno != PUPA_ERR_NONE || *p != '+')
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{
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pupa_error (PUPA_ERR_BAD_FILENAME,
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"invalid file name `%s'", name);
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goto fail;
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}
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}
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else
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blocks[i].offset = 0;
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p++;
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blocks[i].length = pupa_strtoul (p, &p, 0);
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if (pupa_errno != PUPA_ERR_NONE
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|| blocks[i].length == 0
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|| (*p && *p != ',' && ! pupa_isspace (*p)))
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{
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pupa_error (PUPA_ERR_BAD_FILENAME,
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"invalid file name `%s'", name);
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goto fail;
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}
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if (disk->total_sectors < blocks[i].offset + blocks[i].length)
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{
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pupa_error (PUPA_ERR_BAD_FILENAME, "beyond the total sectors");
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goto fail;
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}
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file->size += (blocks[i].length << PUPA_DISK_SECTOR_BITS);
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p++;
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}
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blocks[i].length = 0;
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file->data = blocks;
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return PUPA_ERR_NONE;
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fail:
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pupa_free (blocks);
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return pupa_errno;
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}
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static pupa_ssize_t
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pupa_fs_blocklist_read (pupa_file_t file, char *buf, pupa_ssize_t len)
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{
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struct pupa_fs_block *p;
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unsigned long sector;
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unsigned long offset;
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pupa_ssize_t ret = 0;
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if (len > file->size - file->offset)
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len = file->size - file->offset;
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sector = (file->offset >> PUPA_DISK_SECTOR_BITS);
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offset = (file->offset & (PUPA_DISK_SECTOR_SIZE - 1));
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for (p = file->data; p->length && len > 0; p++)
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{
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if (sector < p->length)
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{
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pupa_ssize_t size;
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size = len;
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if (((size + offset + PUPA_DISK_SECTOR_SIZE - 1)
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>> PUPA_DISK_SECTOR_BITS) > p->length - sector)
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size = ((p->length - sector) << PUPA_DISK_SECTOR_BITS) - offset;
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if (pupa_disk_read (file->device->disk, p->offset + sector, offset,
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size, buf) != PUPA_ERR_NONE)
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return -1;
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ret += size;
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len -= size;
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sector -= ((size + offset) >> PUPA_DISK_SECTOR_BITS);
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offset = ((size + offset) & (PUPA_DISK_SECTOR_SIZE - 1));
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}
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else
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sector -= p->length;
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}
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return ret;
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}
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struct pupa_fs pupa_fs_blocklist =
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{
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.name = "blocklist",
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.dir = 0,
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.open = pupa_fs_blocklist_open,
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.read = pupa_fs_blocklist_read,
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.close = 0,
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.next = 0
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};
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