exFAT file system implementation library.
Free exFAT implementation.
- Copyright (C) 2010-2013 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 <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
-#include <sys/mount.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
-#ifdef __APPLE__
+#include <errno.h>
+#if defined(__APPLE__)
#include <sys/disk.h>
+#elif defined(__OpenBSD__)
+#include <sys/param.h>
+#include <sys/disklabel.h>
+#include <sys/dkio.h>
+#include <sys/ioctl.h>
+#elif __linux__
+#include <sys/mount.h>
#endif
#ifdef USE_UBLIO
#include <sys/uio.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);
if (fd != -1 && ioctl(fd, BLKROGET, &ro) == 0 && ro)
{
close(fd);
+ errno = EROFS;
return -1;
}
#endif
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)
{
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;
}
-#ifdef __APPLE__
+#if defined(__APPLE__)
if (!S_ISREG(stbuf.st_mode))
{
uint32_t block_size = 0;
dev->size = blocks * block_size;
}
else
+#elif defined(__OpenBSD__)
+ if (!S_ISREG(stbuf.st_mode))
+ {
+ struct disklabel lab;
+ struct partition* pp;
+ char* partition;
+
+ if (ioctl(dev->fd, DIOCGDINFO, &lab) == -1)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to get disklabel");
+ return NULL;
+ }
+
+ /* Don't need to check that partition letter is valid as we won't get
+ this far otherwise. */
+ partition = strchr(spec, '\0') - 1;
+ pp = &(lab.d_partitions[*partition - 'a']);
+ dev->size = DL_GETPSIZE(pp) * lab.d_secsize;
+
+ if (pp->p_fstype != FS_NTFS)
+ exfat_warn("partition type is not 0x07 (NTFS/exFAT); "
+ "you can fix this with fdisk(8)");
+ }
+ else
#endif
{
/* works for Linux, FreeBSD, Solaris */
{
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;
}
}
int exfat_close(struct exfat_dev* 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)
{
- free(dev);
- exfat_error("failed to close device");
- return 1;
+ exfat_error("failed to close device: %s", strerror(errno));
+ rc = -EIO;
}
free(dev);
- return 0;
+ return rc;
}
int exfat_fsync(struct exfat_dev* dev)
{
+ int rc = 0;
+
#ifdef USE_UBLIO
if (ublio_fsync(dev->ufh) != 0)
-#else
- if (fsync(dev->fd) != 0)
+ {
+ exfat_error("ublio fsync failed");
+ rc = -EIO;
+ }
#endif
+ if (fsync(dev->fd) != 0)
{
- exfat_error("fsync failed");
- return 1;
+ exfat_error("fsync failed: %s", strerror(errno));
+ rc = -EIO;
}
- return 0;
+ return rc;
}
enum exfat_mode exfat_get_mode(const struct exfat_dev* dev)
#endif
}
-void exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
+ssize_t exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
off_t offset)
{
#ifdef USE_UBLIO
- if (ublio_pread(dev->ufh, buffer, size, offset) != size)
+ return ublio_pread(dev->ufh, buffer, size, offset);
#else
- if (pread(dev->fd, buffer, size, offset) != size)
+ return pread(dev->fd, buffer, size, offset);
#endif
- exfat_bug("failed to read %zu bytes from file at %"PRIu64, size,
- (uint64_t) offset);
}
-void exfat_pwrite(struct exfat_dev* dev, const void* buffer, size_t size,
+ssize_t exfat_pwrite(struct exfat_dev* dev, const void* buffer, size_t size,
off_t offset)
{
#ifdef USE_UBLIO
- if (ublio_pwrite(dev->ufh, buffer, size, offset) != size)
+ return ublio_pwrite(dev->ufh, buffer, size, offset);
#else
- if (pwrite(dev->fd, buffer, size, offset) != size)
+ return pwrite(dev->fd, buffer, size, offset);
#endif
- exfat_bug("failed to write %zu bytes to file at %"PRIu64, size,
- (uint64_t) offset);
}
ssize_t exfat_generic_pread(const struct exfat* ef, struct exfat_node* node,
return 0;
cluster = exfat_advance_cluster(ef, node, offset / CLUSTER_SIZE(*ef->sb));
- if (CLUSTER_INVALID(cluster))
+ 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);
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);
- exfat_pread(ef->dev, bufp, lsize, exfat_c2o(ef, cluster) + loffset);
+ if (exfat_pread(ef->dev, bufp, lsize,
+ exfat_c2o(ef, cluster) + loffset) < 0)
+ {
+ exfat_error("failed to read cluster %#x", cluster);
+ 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;
cluster = exfat_advance_cluster(ef, node, offset / CLUSTER_SIZE(*ef->sb));
- if (CLUSTER_INVALID(cluster))
+ 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);
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);
- exfat_pwrite(ef->dev, bufp, lsize, exfat_c2o(ef, cluster) + loffset);
+ if (exfat_pwrite(ef->dev, bufp, lsize,
+ exfat_c2o(ef, cluster) + loffset) < 0)
+ {
+ exfat_error("failed to write cluster %#x", cluster);
+ 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;
}
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