Try the xfs geometry ioctl if the mkfs target resides
in a file; this gives us the equivalent of a device
sector size.
This does, however, emit a warning if the target file
exists on a non-XFS filesystem, and that might not be super.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
diff --git a/libxfs/linux.c b/libxfs/linux.c
index 2e07d54..d66a90f 100644
--- a/libxfs/linux.c
+++ b/libxfs/linux.c
@@ -141,10 +141,19 @@ platform_findsizes(char *path, int fd, long long *sz, int *bsz)
exit(1);
}
if ((st.st_mode & S_IFMT) == S_IFREG) {
+ struct xfs_fsop_geom_v1 geom = { 0 };
+
*sz = (long long)(st.st_size >> 9);
- *bsz = BBSIZE;
- if (BBSIZE > max_block_alignment)
- max_block_alignment = BBSIZE;
+ if (ioctl(fd, XFS_IOC_FSGEOMETRY_V1, &geom) < 0) {
+ fprintf(stderr, _("Cannot get host filesystem geometry.\n"
+ "mkfs may fail if there is a sector size mismatch between\n"
+ "the image and the host filesystem.\n"));
+ *bsz = BBSIZE;
+ } else
+ *bsz = geom.sectsize;
+
+ if (*bsz > max_block_alignment)
+ max_block_alignment = *bsz;
return;
}
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