mount.c (22.10.09)
exFAT file system implementation library.
- Copyright (C) 2009, 2010 Andrew Nayenko
+ Free exFAT implementation.
+ Copyright (C) 2010-2013 Andrew Nayenko
- This program is free software: you can redistribute it and/or modify
+ 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
- the Free Software Foundation, either version 3 of the License, or
+ the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "exfat.h"
to indicate this */
rootdir_cluster = exfat_next_cluster(ef, ef->root, rootdir_cluster);
}
+ if (rootdir_cluster != EXFAT_CLUSTER_END)
+ {
+ exfat_error("bad cluster %#x while reading root directory",
+ rootdir_cluster);
+ return 0;
+ }
return clusters * CLUSTER_SIZE(*ef->sb);
}
return strtol(p, NULL, base);
}
-static int match_option(const char* options, const char* option_name)
+static bool match_option(const char* options, const char* option_name)
{
const char* p;
size_t length = strlen(option_name);
for (p = strstr(options, option_name); p; p = strstr(p + 1, option_name))
if ((p == options || p[-1] == ',') &&
(p[length] == ',' || p[length] == '\0'))
- return 1;
- return 0;
+ return true;
+ return false;
}
static void parse_options(struct exfat* ef, const char* options)
ef->uid = get_int_option(options, "uid", 10, geteuid());
ef->gid = get_int_option(options, "gid", 10, getegid());
- ef->ro = match_option(options, "ro");
ef->noatime = match_option(options, "noatime");
}
uint32_t vbr_checksum;
int i;
- exfat_pread(dev, sector, sector_size, 0);
+ if (exfat_pread(dev, sector, sector_size, 0) < 0)
+ {
+ exfat_error("failed to read boot sector");
+ return 1;
+ }
vbr_checksum = exfat_vbr_start_checksum(sector, sector_size);
for (i = 1; i < 11; i++)
{
- exfat_pread(dev, sector, sector_size, i * sector_size);
+ if (exfat_pread(dev, sector, sector_size, i * sector_size) < 0)
+ {
+ exfat_error("failed to read VBR sector");
+ return 1;
+ }
vbr_checksum = exfat_vbr_add_checksum(sector, sector_size,
vbr_checksum);
}
- exfat_pread(dev, sector, sector_size, i * sector_size);
+ if (exfat_pread(dev, sector, sector_size, i * sector_size) < 0)
+ {
+ exfat_error("failed to read VBR checksum sector");
+ return 1;
+ }
for (i = 0; i < sector_size / sizeof(vbr_checksum); i++)
if (le32_to_cpu(((const le32_t*) sector)[i]) != vbr_checksum)
{
static int commit_super_block(const struct exfat* ef)
{
- exfat_pwrite(ef->dev, ef->sb, sizeof(struct exfat_super_block), 0);
+ if (exfat_pwrite(ef->dev, ef->sb, sizeof(struct exfat_super_block), 0) < 0)
+ {
+ exfat_error("failed to write super block");
+ return 1;
+ }
return exfat_fsync(ef->dev);
}
int exfat_mount(struct exfat* ef, const char* spec, const char* options)
{
int rc;
+ enum exfat_mode mode;
exfat_tzset();
memset(ef, 0, sizeof(struct exfat));
parse_options(ef, options);
- ef->dev = exfat_open(spec, ef->ro);
+ if (match_option(options, "ro"))
+ mode = EXFAT_MODE_RO;
+ else if (match_option(options, "ro_fallback"))
+ mode = EXFAT_MODE_ANY;
+ else
+ mode = EXFAT_MODE_RW;
+ ef->dev = exfat_open(spec, mode);
if (ef->dev == NULL)
+ return -EIO;
+ if (exfat_get_mode(ef->dev) == EXFAT_MODE_RO)
{
- if (ef->ro || !match_option(options, "ro_fallback"))
- return -EIO;
- ef->dev = exfat_open(spec, 1);
- if (ef->dev == NULL)
- return -EIO;
- exfat_warn("device is write-protected, mounting read-only");
- ef->ro_fallback = ef->ro = 1;
+ if (mode == EXFAT_MODE_ANY)
+ ef->ro = -1;
+ else
+ ef->ro = 1;
}
ef->sb = malloc(sizeof(struct exfat_super_block));
}
memset(ef->sb, 0, sizeof(struct exfat_super_block));
- exfat_pread(ef->dev, ef->sb, sizeof(struct exfat_super_block), 0);
+ if (exfat_pread(ef->dev, ef->sb, sizeof(struct exfat_super_block), 0) < 0)
+ {
+ exfat_close(ef->dev);
+ free(ef->sb);
+ exfat_error("failed to read boot sector");
+ return -EIO;
+ }
if (memcmp(ef->sb->oem_name, "EXFAT ", 8) != 0)
{
exfat_close(ef->dev);
ef->root->fptr_cluster = ef->root->start_cluster;
ef->root->name[0] = cpu_to_le16('\0');
ef->root->size = rootdir_size(ef);
+ if (ef->root->size == 0)
+ {
+ free(ef->root);
+ free(ef->zero_cluster);
+ exfat_close(ef->dev);
+ free(ef->sb);
+ return -EIO;
+ }
/* exFAT does not have time attributes for the root directory */
ef->root->mtime = 0;
ef->root->atime = 0;
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