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906c0186bc
If we're making a file system in a real device then we need to get the device size with an ioctl.
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/fs.h>
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#include <errno.h>
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#include "sparse.h"
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#include "dev.h"
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int device_size(char *path, int fd, u64 *size)
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{
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struct stat st;
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int ret;
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if (fstat(fd, &st)) {
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ret = -errno;
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fprintf(stderr, "failed to stat '%s': %s (%d)\n",
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path, strerror(errno), errno);
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return ret;
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}
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if (S_ISREG(st.st_mode)) {
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*size = st.st_size;
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} else if (S_ISBLK(st.st_mode)) {
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if (ioctl(fd, BLKGETSIZE64, size)) {
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ret = -errno;
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fprintf(stderr, "BLKGETSIZE64 failed '%s': %s (%d)\n",
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path, strerror(errno), errno);
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return ret;
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}
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} else {
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fprintf(stderr, "path isn't regular or device file '%s'\n",
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path);
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return -EINVAL;
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}
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return 0;
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}
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