exFAT file system implementation library.
Free exFAT implementation.
- Copyright (C) 2010-2015 Andrew Nayenko
+ Copyright (C) 2010-2018 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 <sys/disklabel.h>
#include <sys/dkio.h>
#include <sys/ioctl.h>
-#endif
+#elif defined(__NetBSD__)
+#include <sys/ioctl.h>
+#elif __linux__
#include <sys/mount.h>
+#endif
#ifdef USE_UBLIO
#include <sys/uio.h>
#include <ublio.h>
#endif
};
+static bool is_open(int fd)
+{
+ return fcntl(fd, F_GETFD) != -1;
+}
+
static int open_ro(const char* spec)
{
return open(spec, O_RDONLY);
struct ublio_param up;
#endif
+ /* The system allocates file descriptors sequentially. If we have been
+ started with stdin (0), stdout (1) or stderr (2) closed, the system
+ will give us descriptor 0, 1 or 2 later when we open block device,
+ FUSE communication pipe, etc. As a result, functions using stdin,
+ stdout or stderr will actually work with a different thing and can
+ corrupt it. Protect descriptors 0, 1 and 2 from such misuse. */
+ while (!is_open(STDIN_FILENO)
+ || !is_open(STDOUT_FILENO)
+ || !is_open(STDERR_FILENO))
+ {
+ /* we don't need those descriptors, let them leak */
+ if (open("/dev/null", O_RDWR) == -1)
+ {
+ exfat_error("failed to open /dev/null");
+ return NULL;
+ }
+ }
+
dev = malloc(sizeof(struct exfat_dev));
if (dev == NULL)
{
"you can fix this with fdisk(8)");
}
else
+#elif defined(__NetBSD__)
+ if (!S_ISREG(stbuf.st_mode))
+ {
+ off_t size;
+
+ if (ioctl(dev->fd, DIOCGMEDIASIZE, &size) == -1)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to get media size");
+ return NULL;
+ }
+ dev->size = size;
+ }
+ else
#endif
{
/* works for Linux, FreeBSD, Solaris */
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);
+ ssize_t result = ublio_pwrite(dev->ufh, (void*) buffer, size, dev->pos);
if (result >= 0)
dev->pos += size;
return result;
off_t offset)
{
#ifdef USE_UBLIO
- return ublio_pwrite(dev->ufh, buffer, size, offset);
+ return ublio_pwrite(dev->ufh, (void*) 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,
void* buffer, size_t size, off_t offset)
{
+ uint64_t newsize = offset;
cluster_t cluster;
char* bufp = buffer;
off_t lsize, loffset, remainder;
- if (offset >= node->size)
+ if (offset < 0)
+ return -EINVAL;
+ if (newsize >= node->size)
return 0;
if (size == 0)
return 0;
- cluster = exfat_advance_cluster(ef, node, offset / CLUSTER_SIZE(*ef->sb));
- if (CLUSTER_INVALID(cluster))
+ cluster = exfat_advance_cluster(ef, node, newsize / CLUSTER_SIZE(*ef->sb));
+ if (CLUSTER_INVALID(*ef->sb, cluster))
{
exfat_error("invalid cluster 0x%x while reading", cluster);
- return -1;
+ return -EIO;
}
- loffset = offset % CLUSTER_SIZE(*ef->sb);
- remainder = MIN(size, node->size - offset);
+ loffset = newsize % CLUSTER_SIZE(*ef->sb);
+ remainder = MIN(size, node->size - newsize);
while (remainder > 0)
{
- if (CLUSTER_INVALID(cluster))
+ if (CLUSTER_INVALID(*ef->sb, 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;
+ return MIN(size, node->size - newsize) - remainder;
}
ssize_t exfat_generic_pwrite(struct exfat* ef, struct exfat_node* node,
const void* buffer, size_t size, off_t offset)
{
+ uint64_t newsize = 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;
- if (offset + size > node->size)
- if (exfat_truncate(ef, node, offset + size, false) != 0)
- return -1;
+ if (offset < 0)
+ return -EINVAL;
+ if (newsize > node->size)
+ {
+ rc = exfat_truncate(ef, node, newsize, true);
+ if (rc != 0)
+ return rc;
+ }
+ if (newsize + size > node->size)
+ {
+ rc = exfat_truncate(ef, node, newsize + size, false);
+ if (rc != 0)
+ return rc;
+ }
if (size == 0)
return 0;
- cluster = exfat_advance_cluster(ef, node, offset / CLUSTER_SIZE(*ef->sb));
- if (CLUSTER_INVALID(cluster))
+ cluster = exfat_advance_cluster(ef, node, newsize / CLUSTER_SIZE(*ef->sb));
+ if (CLUSTER_INVALID(*ef->sb, cluster))
{
exfat_error("invalid cluster 0x%x while writing", cluster);
- return -1;
+ return -EIO;
}
- loffset = offset % CLUSTER_SIZE(*ef->sb);
+ loffset = newsize % CLUSTER_SIZE(*ef->sb);
remainder = size;
while (remainder > 0)
{
- if (CLUSTER_INVALID(cluster))
+ if (CLUSTER_INVALID(*ef->sb, 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;
}
projects / sven / fuse-exfat.git / blobdiff