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[PATCH] mkfs: handle 4k sector devices more cleanly

To: xfs-oss <xfs@xxxxxxxxxxx>
Subject: [PATCH] mkfs: handle 4k sector devices more cleanly
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Tue, 08 Dec 2009 12:25:41 -0600
User-agent: Thunderbird 2.0.0.23 (Macintosh/20090812)
Trying to mkfs a 4k sector device today fails w/o manually specifying
sector size:

# modprobe scsi_debug sector_size=4096 dev_size_mb=32
# mkfs.xfs -f /dev/sdc
mkfs.xfs: warning - cannot set blocksize on block device /dev/sdc: Invalid 
argument
Warning: the data subvolume sector size 512 is less than the sector size 
reported by the device (4096).
... <fail>

add sectorsize to the device topology info, and use that if present.

Also check that explicitly requested sector sizes are not smaller
than the hardware size.  This already fails today, but with the more
cryptic "cannot set blocksize" ioctl error above.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

diff --git a/libxfs/linux.c b/libxfs/linux.c
index bc49903..2e07d54 100644
--- a/libxfs/linux.c
+++ b/libxfs/linux.c
@@ -112,9 +112,9 @@ platform_set_blocksize(int fd, char *path, dev_t device, 
int blocksize, int fata
        if (major(device) != RAMDISK_MAJOR) {
                if ((error = ioctl(fd, BLKBSZSET, &blocksize)) < 0) {
                        fprintf(stderr, _("%s: %s - cannot set blocksize "
-                                       "on block device %s: %s\n"),
+                                       "%d on block device %s: %s\n"),
                                progname, fatal ? "error": "warning",
-                               path, strerror(errno));
+                               blocksize, path, strerror(errno));
                }
        }
        return error;
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index bd92bc0..be8271e 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -33,6 +33,7 @@ struct fs_topology {
        int     dsunit;         /* stripe unit - data subvolume */
        int     dswidth;        /* stripe width - data subvolume */
        int     rtswidth;       /* stripe width - rt subvolume */
+       int     sectorsize;
        int     sectoralign;
 };
 
@@ -320,7 +321,7 @@ out_free_probe:
        return ret;
 }
 
-static void blkid_get_topology(const char *device, int *sunit, int *swidth)
+static void blkid_get_topology(const char *device, int *sunit, int *swidth, 
int *sectorsize)
 {
        blkid_topology tp;
        blkid_probe pr;
@@ -348,7 +349,9 @@ static void blkid_get_topology(const char *device, int 
*sunit, int *swidth)
        val = blkid_topology_get_optimal_io_size(tp) >> 9;
        if (val > 1)
                *swidth = val;
-
+       val = blkid_probe_get_sectorsize(pr);
+       if (val > 1)
+               *sectorsize = val;
        if (blkid_topology_get_alignment_offset(tp) != 0) {
                fprintf(stderr,
                        _("warning: device is not properly aligned %s\n"),
@@ -370,13 +373,13 @@ static void get_topology(libxfs_init_t *xi, struct 
fs_topology *ft)
        if (!xi->disfile) {
                const char *dfile = xi->volname ? xi->volname : xi->dname;
 
-               blkid_get_topology(dfile, &ft->dsunit, &ft->dswidth);
+               blkid_get_topology(dfile, &ft->dsunit, &ft->dswidth, 
&ft->sectorsize);
        }
 
        if (xi->rtname && !xi->risfile) {
                int dummy;
 
-               blkid_get_topology(xi->rtname, &dummy, &ft->rtswidth);
+               blkid_get_topology(xi->rtname, &dummy, &ft->rtswidth, &dummy);
        }
 }
 #else /* ENABLE_BLKID */
@@ -1543,8 +1546,15 @@ main(
        memset(&ft, 0, sizeof(ft));
        get_topology(&xi, &ft);
 
-       if (ft.sectoralign) {
-               sectorsize = blocksize;
+       /*
+        * MD wants sector size set == block size to avoid switching.
+        * Otherwise, if not specfied via command, use device sectorsize
+        */
+       if (ft.sectoralign || !ssflag) {
+               if (ft.sectoralign)
+                       sectorsize = blocksize;
+               else
+                       sectorsize = ft.sectorsize;
                sectorlog = libxfs_highbit32(sectorsize);
                if (loginternal) {
                        lsectorsize = sectorsize;
@@ -1556,6 +1566,11 @@ main(
                fprintf(stderr, _("illegal sector size %d\n"), sectorsize);
                usage();
        }
+       if (sectorsize < ft.sectorsize) {
+               fprintf(stderr, _("illegal sector size %d; hw sector is %d\n"),
+                       sectorsize, ft.sectorsize);
+               usage();
+       }
        if (lsectorsize < XFS_MIN_SECTORSIZE ||
            lsectorsize > XFS_MAX_SECTORSIZE || lsectorsize > blocksize) {
                fprintf(stderr, _("illegal log sector size %d\n"), lsectorsize);
@@ -1749,10 +1764,10 @@ main(
        calc_stripe_factors(dsu, dsw, sectorsize, lsu, lsectorsize,
                                &dsunit, &dswidth, &lsunit);
 
-       if (slflag || ssflag)
+       if (slflag || ssflag || ft.setorsize)
                xi.setblksize = sectorsize;
        else
-               xi.setblksize = 1;
+               xi.setblksize = 1; /* Use default sector size */
 
        /*
         * Initialize.  This will open the log and rt devices as well.

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