exFAT file system implementation library.
Free exFAT implementation.
- Copyright (C) 2010-2013 Andrew Nayenko
+ Copyright (C) 2010-2016 Andrew Nayenko
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
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
-#include <sys/mount.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/dkio.h>
#include <sys/ioctl.h>
#endif
-#ifdef USE_UBLIO
-#include <sys/uio.h>
-#include <ublio.h>
-#endif
+#include <sys/mount.h>
struct exfat_dev
{
int fd;
enum exfat_mode mode;
off_t size; /* in bytes */
-#ifdef USE_UBLIO
- off_t pos;
- ublio_filehandle_t ufh;
-#endif
};
static int open_ro(const char* spec)
if (fd != -1 && ioctl(fd, BLKROGET, &ro) == 0 && ro)
{
close(fd);
+ errno = EROFS;
return -1;
}
#endif
{
struct exfat_dev* dev;
struct stat stbuf;
-#ifdef USE_UBLIO
- struct ublio_param up;
-#endif
dev = malloc(sizeof(struct exfat_dev));
if (dev == NULL)
if (dev->fd == -1)
{
free(dev);
- exfat_error("failed to open `%s' in read-only mode", spec);
+ exfat_error("failed to open '%s' in read-only mode: %s", spec,
+ strerror(errno));
return NULL;
}
dev->mode = EXFAT_MODE_RO;
if (dev->fd == -1)
{
free(dev);
- exfat_error("failed to open `%s' in read-write mode", spec);
+ exfat_error("failed to open '%s' in read-write mode: %s", spec,
+ strerror(errno));
return NULL;
}
dev->mode = EXFAT_MODE_RW;
if (dev->fd != -1)
{
dev->mode = EXFAT_MODE_RO;
- exfat_warn("`%s' is write-protected, mounting read-only", spec);
+ exfat_warn("'%s' is write-protected, mounting read-only", spec);
break;
}
free(dev);
- exfat_error("failed to open `%s'", spec);
+ exfat_error("failed to open '%s': %s", spec, strerror(errno));
return NULL;
}
{
close(dev->fd);
free(dev);
- exfat_error("failed to fstat `%s'", spec);
+ exfat_error("failed to fstat '%s'", spec);
return NULL;
}
if (!S_ISBLK(stbuf.st_mode) &&
{
close(dev->fd);
free(dev);
- exfat_error("`%s' is neither a device, nor a regular file", spec);
+ exfat_error("'%s' is neither a device, nor a regular file", spec);
return NULL;
}
{
close(dev->fd);
free(dev);
- exfat_error("failed to get size of `%s'", spec);
+ exfat_error("failed to get size of '%s'", spec);
return NULL;
}
if (exfat_seek(dev, 0, SEEK_SET) == -1)
{
close(dev->fd);
free(dev);
- exfat_error("failed to seek to the beginning of `%s'", spec);
+ exfat_error("failed to seek to the beginning of '%s'", spec);
return NULL;
}
}
-#ifdef USE_UBLIO
- memset(&up, 0, sizeof(struct ublio_param));
- up.up_blocksize = 256 * 1024;
- up.up_items = 64;
- up.up_grace = 32;
- up.up_priv = &dev->fd;
-
- dev->pos = 0;
- dev->ufh = ublio_open(&up);
- if (dev->ufh == NULL)
- {
- close(dev->fd);
- free(dev);
- exfat_error("failed to initialize ublio");
- return NULL;
- }
-#endif
-
return dev;
}
{
int rc = 0;
-#ifdef USE_UBLIO
- if (ublio_close(dev->ufh) != 0)
- {
- exfat_error("failed to close ublio");
- rc = -EIO;
- }
-#endif
if (close(dev->fd) != 0)
{
- exfat_error("failed to close device");
+ exfat_error("failed to close device: %s", strerror(errno));
rc = -EIO;
}
free(dev);
{
int rc = 0;
-#ifdef USE_UBLIO
- if (ublio_fsync(dev->ufh) != 0)
- {
- exfat_error("ublio fsync failed");
- rc = -EIO;
- }
-#endif
if (fsync(dev->fd) != 0)
{
- exfat_error("fsync failed");
+ exfat_error("fsync failed: %s", strerror(errno));
rc = -EIO;
}
return rc;
off_t exfat_seek(struct exfat_dev* dev, off_t offset, int whence)
{
-#ifdef USE_UBLIO
- /* XXX SEEK_CUR will be handled incorrectly */
- return dev->pos = lseek(dev->fd, offset, whence);
-#else
return lseek(dev->fd, offset, whence);
-#endif
}
ssize_t exfat_read(struct exfat_dev* dev, void* buffer, size_t size)
{
-#ifdef USE_UBLIO
- ssize_t result = ublio_pread(dev->ufh, buffer, size, dev->pos);
- if (result >= 0)
- dev->pos += size;
- return result;
-#else
return read(dev->fd, buffer, size);
-#endif
}
ssize_t exfat_write(struct exfat_dev* dev, const void* buffer, size_t size)
{
-#ifdef USE_UBLIO
- ssize_t result = ublio_pwrite(dev->ufh, buffer, size, dev->pos);
- if (result >= 0)
- dev->pos += size;
- return result;
-#else
return write(dev->fd, buffer, size);
-#endif
}
ssize_t exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
off_t offset)
{
-#ifdef USE_UBLIO
- return ublio_pread(dev->ufh, buffer, size, offset);
-#else
return pread(dev->fd, buffer, size, offset);
-#endif
}
ssize_t exfat_pwrite(struct exfat_dev* dev, const void* buffer, size_t size,
off_t offset)
{
-#ifdef USE_UBLIO
- return ublio_pwrite(dev->ufh, buffer, size, offset);
-#else
return pwrite(dev->fd, buffer, size, offset);
-#endif
}
ssize_t exfat_generic_pread(const struct exfat* ef, struct exfat_node* node,
if (CLUSTER_INVALID(cluster))
{
exfat_error("invalid cluster 0x%x while reading", cluster);
- return -1;
+ return -EIO;
}
loffset = offset % CLUSTER_SIZE(*ef->sb);
if (CLUSTER_INVALID(cluster))
{
exfat_error("invalid cluster 0x%x while reading", cluster);
- return -1;
+ return -EIO;
}
lsize = MIN(CLUSTER_SIZE(*ef->sb) - loffset, remainder);
if (exfat_pread(ef->dev, bufp, lsize,
exfat_c2o(ef, cluster) + loffset) < 0)
{
exfat_error("failed to read cluster %#x", cluster);
- return -1;
+ return -EIO;
}
bufp += lsize;
loffset = 0;
remainder -= lsize;
cluster = exfat_next_cluster(ef, node, cluster);
}
- if (!ef->ro && !ef->noatime)
+ if (!(node->attrib & EXFAT_ATTRIB_DIR) && !ef->ro && !ef->noatime)
exfat_update_atime(node);
return MIN(size, node->size - offset) - remainder;
}
ssize_t exfat_generic_pwrite(struct exfat* ef, struct exfat_node* node,
const void* buffer, size_t size, off_t offset)
{
+ int rc;
cluster_t cluster;
const char* bufp = buffer;
off_t lsize, loffset, remainder;
if (offset > node->size)
- if (exfat_truncate(ef, node, offset, true) != 0)
- return -1;
+ {
+ rc = exfat_truncate(ef, node, offset, true);
+ if (rc != 0)
+ return rc;
+ }
if (offset + size > node->size)
- if (exfat_truncate(ef, node, offset + size, false) != 0)
- return -1;
+ {
+ rc = exfat_truncate(ef, node, offset + size, false);
+ if (rc != 0)
+ return rc;
+ }
if (size == 0)
return 0;
if (CLUSTER_INVALID(cluster))
{
exfat_error("invalid cluster 0x%x while writing", cluster);
- return -1;
+ return -EIO;
}
loffset = offset % CLUSTER_SIZE(*ef->sb);
if (CLUSTER_INVALID(cluster))
{
exfat_error("invalid cluster 0x%x while writing", cluster);
- return -1;
+ return -EIO;
}
lsize = MIN(CLUSTER_SIZE(*ef->sb) - loffset, remainder);
if (exfat_pwrite(ef->dev, bufp, lsize,
exfat_c2o(ef, cluster) + loffset) < 0)
{
exfat_error("failed to write cluster %#x", cluster);
- return -1;
+ return -EIO;
}
bufp += lsize;
loffset = 0;
remainder -= lsize;
cluster = exfat_next_cluster(ef, node, cluster);
}
- exfat_update_mtime(node);
+ if (!(node->attrib & EXFAT_ATTRIB_DIR))
+ /* directory's mtime should be updated by the caller only when it
+ creates or removes something in this directory */
+ exfat_update_mtime(node);
return size - remainder;
}