Re: LVM and XFS cannot set blocksize on block device

[Timothy Shimmin <tes@sgi.com>]

[-- Attachment #1: Type: text/plain, Size: 954 bytes --]

Shailendra Tripathi wrote:
>>> Thanks for the reply. The "-s size=4096" helped I was able to create
>>> the file system, then mount it and use it.  I did however get a
>>> warning still about "cannot set blocksize on block device".
> 
>>
>> I don't know much about the LVM code, my guess is that
>> ioctl(... ,BLKBSZSET, ...) is failing, strace would confirm this.
> 
> 
> libxfs_device_open () seems to be working with the pre-conceived notion 
> of assuming block devices of only 512 bytes in size.
> 
> if (!readonly && setblksize && (statb.st_mode & S_IFMT) == S_IFBLK)
>    platform_set_blocksize(fd, path, statb.st_rdev, 512);
> 
> This eventually calls to set the blk sz to 512. Since, your volume does 
> not support less than 4k, it returns EINVAL. I think, libxfs_init should 
> be modified to take pass on the -s size option to this call so that it 
> does not happen.


I've attached a patch.
Is this the sort of thing you were after?

--Tim

[-- Attachment #2: blksize.patch --]
[-- Type: text/plain, Size: 5008 bytes --]

Subject: Re: LVM and XFS cannot set blocksize on block device

Shailendra wrote:
    libxfs_device_open () seems to be working with the pre-conceived notion
    of assuming block devices of only 512 bytes in size.
    This eventually calls to set the blk sz to 512. Since, your volume does
    not support less than 4k, it returns EINVAL. I think, libxfs_init should
    be modified to pass on the -s size option to this call so that it
    does not happen.
    ...

Index: xfsprogs/libxfs/darwin.c
===================================================================
--- xfsprogs/libxfs/darwin.c.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/libxfs/darwin.c	2006-10-03 16:03:48.000000000 +1000
@@ -51,8 +51,8 @@
 	return (writable == 0);
 }
 
-void
-platform_set_blocksize(int fd, char *path, dev_t device, int blocksize)
+int
+platform_set_blocksize(int fd, char *path, dev_t device, int blocksize, int fatal)
 {
 }
 
Index: xfsprogs/libxfs/freebsd.c
===================================================================
--- xfsprogs/libxfs/freebsd.c.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/libxfs/freebsd.c	2006-10-03 16:03:48.000000000 +1000
@@ -91,8 +91,8 @@
 	return 0;
 }
 
-void
-platform_set_blocksize(int fd, char *path, dev_t device, int blocksize)
+int
+platform_set_blocksize(int fd, char *path, dev_t device, int blocksize, int fatal)
 {
 	return;
 }
Index: xfsprogs/libxfs/init.c
===================================================================
--- xfsprogs/libxfs/init.c.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/libxfs/init.c	2006-10-03 16:34:41.000000000 +1000
@@ -116,8 +116,16 @@
 		exit(1);
 	}
 
-	if (!readonly && setblksize && (statb.st_mode & S_IFMT) == S_IFBLK)
-		platform_set_blocksize(fd, path, statb.st_rdev, 512);
+	if (!readonly && setblksize && (statb.st_mode & S_IFMT) == S_IFBLK) {
+		if (setblksize == 1)
+			/* use the default blocksize */
+			(void)platform_set_blocksize(fd, path, statb.st_rdev, XFS_MIN_SECTORSIZE, 0);
+		else {
+			/* given an explicit blocksize to use */
+			if (platform_set_blocksize(fd, path, statb.st_rdev, setblksize, 1))
+			    exit(1);
+		}
+	}
 
 	/*
 	 * Get the device number from the stat buf - unless
Index: xfsprogs/libxfs/irix.c
===================================================================
--- xfsprogs/libxfs/irix.c.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/libxfs/irix.c	2006-10-03 16:03:48.000000000 +1000
@@ -36,8 +36,8 @@
 	return 1;
 }
 
-void
-platform_set_blocksize(int fd, char *path, dev_t device, int blocksize)
+int
+platform_set_blocksize(int fd, char *path, dev_t device, int blocksize, int fatal)
 {
 	return;
 }
Index: xfsprogs/libxfs/linux.c
===================================================================
--- xfsprogs/libxfs/linux.c.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/libxfs/linux.c	2006-10-03 16:03:48.000000000 +1000
@@ -102,16 +102,20 @@
 	return sts;
 }
 
-void
-platform_set_blocksize(int fd, char *path, dev_t device, int blocksize)
+int
+platform_set_blocksize(int fd, char *path, dev_t device, int blocksize, int fatal)
 {
+	int error = 0;
+
 	if (major(device) != RAMDISK_MAJOR) {
-		if (ioctl(fd, BLKBSZSET, &blocksize) < 0) {
-			fprintf(stderr, _("%s: warning - cannot set blocksize "
+		if ((error = ioctl(fd, BLKBSZSET, &blocksize)) < 0) {
+			fprintf(stderr, _("%s: %s - cannot set blocksize "
 					"on block device %s: %s\n"),
-				progname, path, strerror(errno));
+				progname, fatal ? "error": "warning",
+				path, strerror(errno));
 		}
 	}
+	return error;
 }
 
 void
Index: xfsprogs/mkfs/xfs_mkfs.c
===================================================================
--- xfsprogs/mkfs/xfs_mkfs.c.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/mkfs/xfs_mkfs.c	2006-10-03 16:03:48.000000000 +1000
@@ -634,7 +634,6 @@
 	bzero(&fsx, sizeof(fsx));
 
 	bzero(&xi, sizeof(xi));
-	xi.setblksize = 1;
 	xi.isdirect = LIBXFS_DIRECT;
 	xi.isreadonly = LIBXFS_EXCLUSIVELY;
 
@@ -1506,6 +1505,11 @@
 	calc_stripe_factors(dsu, dsw, sectorsize, lsu, lsectorsize,
 				&dsunit, &dswidth, &lsunit);
 
+	if (slflag || ssflag)
+	    xi.setblksize = sectorsize;
+	else
+	    xi.setblksize = 1;
+
 	/*
 	 * Initialize.  This will open the log and rt devices as well.
 	 */
Index: xfsprogs/libxfs/init.h
===================================================================
--- xfsprogs/libxfs/init.h.orig	2006-10-03 16:10:41.000000000 +1000
+++ xfsprogs/libxfs/init.h	2006-10-03 16:03:48.000000000 +1000
@@ -25,7 +25,7 @@
 extern int platform_check_iswritable (char *path, char *block,
 					struct stat64 *sptr, int fatal);
 extern void platform_findsizes (char *path, int fd, long long *sz, int *bsz);
-extern void platform_set_blocksize (int fd, char *path, dev_t device, int bsz);
+extern int platform_set_blocksize (int fd, char *path, dev_t device, int bsz, int fatal);
 extern void platform_flush_device (int fd, dev_t device);
 extern char *platform_findrawpath(char *path);
 extern char *platform_findrawpath (char *path);