/*
- * io.c
- * exFAT file system implementation library.
- *
- * Created by Andrew Nayenko on 02.09.09.
- * This software is distributed under the GNU General Public License
- * version 3 or any later.
- */
+ io.c (02.09.09)
+ exFAT file system implementation library.
+
+ Copyright (C) 2010-2012 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
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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/>.
+*/
#include "exfat.h"
+#include <inttypes.h>
#include <sys/types.h>
#include <sys/uio.h>
-#define __USE_UNIX98 /* for pread() in Linux */
+#include <sys/stat.h>
+#include <fcntl.h>
#include <unistd.h>
+#include <string.h>
+#ifdef USE_UBLIO
+#include <sys/uio.h>
+#include <ublio.h>
+#endif
-#if _FILE_OFFSET_BITS != 64
+#if !defined(_FILE_OFFSET_BITS) || (_FILE_OFFSET_BITS != 64)
#error You should define _FILE_OFFSET_BITS=64
#endif
-void exfat_read_raw(void* buffer, size_t size, off_t offset, int fd)
+struct exfat_dev
{
- if (pread(fd, buffer, size, offset) != size)
- exfat_bug("failed to read %zu bytes from file at %llu", size, offset);
+ int fd;
+#ifdef USE_UBLIO
+ off_t pos;
+ ublio_filehandle_t ufh;
+#endif
+};
+
+struct exfat_dev* exfat_open(const char* spec, int ro)
+{
+ struct exfat_dev* dev;
+ struct stat stbuf;
+#ifdef USE_UBLIO
+ struct ublio_param up;
+#endif
+
+ dev = malloc(sizeof(struct exfat_dev));
+ if (dev == NULL)
+ {
+ exfat_error("failed to allocate memory for device structure");
+ return NULL;
+ }
+
+ dev->fd = open(spec, ro ? O_RDONLY : O_RDWR);
+ if (dev->fd < 0)
+ {
+ free(dev);
+ exfat_error("failed to open `%s' in read-%s mode", spec,
+ ro ? "only" : "write");
+ return NULL;
+ }
+ if (fstat(dev->fd, &stbuf) != 0)
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("failed to fstat `%s'", spec);
+ return NULL;
+ }
+ if (!S_ISBLK(stbuf.st_mode) &&
+ !S_ISCHR(stbuf.st_mode) &&
+ !S_ISREG(stbuf.st_mode))
+ {
+ close(dev->fd);
+ free(dev);
+ exfat_error("`%s' is neither a device, nor a regular file", 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;
}
-void exfat_write_raw(const void* buffer, size_t size, off_t offset, int fd)
+int exfat_close(struct exfat_dev* dev)
{
- if (pwrite(fd, buffer, size, offset) != size)
- exfat_bug("failed to write %zu bytes to file at %llu", size, offset);
+#ifdef USE_UBLIO
+ if (ublio_close(dev->ufh) != 0)
+ exfat_error("failed to close ublio");
+#endif
+ if (close(dev->fd) != 0)
+ {
+ free(dev);
+ exfat_error("failed to close device");
+ return 1;
+ }
+ free(dev);
+ return 0;
}
-ssize_t exfat_read(const struct exfat* ef, struct exfat_node* node,
+int exfat_fsync(struct exfat_dev* dev)
+{
+#ifdef USE_UBLIO
+ if (ublio_fsync(dev->ufh) != 0)
+#else
+ if (fsync(dev->fd) != 0)
+#endif
+ {
+ exfat_error("fsync failed");
+ return 1;
+ }
+ return 0;
+}
+
+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
+}
+
+void 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)
+#else
+ if (pread(dev->fd, buffer, size, offset) != size)
+#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,
+ off_t offset)
+{
+#ifdef USE_UBLIO
+ if (ublio_pwrite(dev->ufh, buffer, size, offset) != size)
+#else
+ if (pwrite(dev->fd, buffer, size, offset) != size)
+#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,
void* buffer, size_t size, off_t offset)
{
cluster_t cluster;
return -1;
}
lsize = MIN(CLUSTER_SIZE(*ef->sb) - loffset, remainder);
- exfat_read_raw(bufp, lsize, exfat_c2o(ef, cluster) + loffset, ef->fd);
+ exfat_pread(ef->dev, bufp, lsize, exfat_c2o(ef, cluster) + loffset);
bufp += lsize;
loffset = 0;
remainder -= lsize;
cluster = exfat_next_cluster(ef, node, cluster);
}
+ if (!ef->ro && !ef->noatime)
+ exfat_update_atime(node);
return size - remainder;
}
-ssize_t exfat_write(struct exfat* ef, struct exfat_node* node,
+ssize_t exfat_generic_pwrite(struct exfat* ef, struct exfat_node* node,
const void* buffer, size_t size, off_t offset)
{
cluster_t cluster;
off_t lsize, loffset, remainder;
if (offset + size > node->size)
- exfat_truncate(ef, node, offset + size);
+ {
+ int rc = exfat_truncate(ef, node, offset + size);
+ if (rc != 0)
+ return rc;
+ }
if (size == 0)
return 0;
return -1;
}
lsize = MIN(CLUSTER_SIZE(*ef->sb) - loffset, remainder);
- exfat_write_raw(bufp, lsize, exfat_c2o(ef, cluster) + loffset, ef->fd);
+ exfat_pwrite(ef->dev, bufp, lsize, exfat_c2o(ef, cluster) + loffset);
bufp += lsize;
loffset = 0;
remainder -= lsize;
cluster = exfat_next_cluster(ef, node, cluster);
}
- /* FIXME update modification time */
- /* FIXME no need to flush immediately */
- exfat_flush_node(ef, node);
+ exfat_update_mtime(node);
return size - remainder;
}
OSDN Git Service
