+ fs-sysv-superc-add-support-for-non-pdp11-v7-filesystems.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     fs/sysv/super.c: add support for non-PDP11 v7 filesystems
has been added to the -mm tree.  Its filename is
     fs-sysv-superc-add-support-for-non-pdp11-v7-filesystems.patch

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------------------------------------------------------
Subject: fs/sysv/super.c: add support for non-PDP11 v7 filesystems
From: Lubomir Rintel <lkundrak@v3.sk>

This adds byte order autodetection (of PDP-11 and LE filesystems).  No
attempt is made to detect big-endian filesystems -- were there any? 
Tested with PDP-11 v7 filesystems and PC-IX maintenance floppy.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/sysv/super.c |   74 +++++++++++++++++++++++++++++++---------------
 1 file changed, 50 insertions(+), 24 deletions(-)

diff -puN fs/sysv/super.c~fs-sysv-superc-add-support-for-non-pdp11-v7-filesystems fs/sysv/super.c
--- a/fs/sysv/super.c~fs-sysv-superc-add-support-for-non-pdp11-v7-filesystems
+++ a/fs/sysv/super.c
@@ -24,6 +24,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
+#include <linux/parser.h>
 #include "sysv.h"
 
 /*
@@ -434,12 +435,46 @@ Ebadsize:
 	goto failed;
 }
 
-static int v7_fill_super(struct super_block *sb, void *data, int silent)
+static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh)
 {
-	struct sysv_sb_info *sbi;
-	struct buffer_head *bh, *bh2 = NULL;
 	struct v7_super_block *v7sb;
 	struct sysv_inode *v7i;
+	struct buffer_head *bh2;
+	struct sysv_sb_info *sbi;
+
+	sbi = sb->s_fs_info;
+
+	/* plausibility check on superblock */
+	v7sb = (struct v7_super_block *) bh->b_data;
+	if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
+	    fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
+	    fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
+		return 0;
+
+	/* plausibility check on root inode: it is a directory,
+	   with a nonzero size that is a multiple of 16 */
+	if ((bh2 = sb_bread(sb, 2)) == NULL) {
+		return 0;
+	}
+
+	v7i = (struct sysv_inode *)(bh2->b_data + 64);
+	if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
+	    (fs32_to_cpu(sbi, v7i->i_size) == 0) ||
+	    (fs32_to_cpu(sbi, v7i->i_size) & 017) ||
+	    (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
+             sizeof (struct sysv_dir_entry))) {
+		brelse(bh2);
+		return 0;
+	}
+
+	brelse(bh2);
+	return 1;
+}
+
+static int v7_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct sysv_sb_info *sbi;
+	struct buffer_head *bh;
 
 	if (440 != sizeof (struct v7_super_block))
 		panic("V7 FS: bad super-block size");
@@ -453,7 +488,6 @@ static int v7_fill_super(struct super_bl
 	sbi->s_sb = sb;
 	sbi->s_block_base = 0;
 	sbi->s_type = FSTYPE_V7;
-	sbi->s_bytesex = BYTESEX_PDP;
 	sb->s_fs_info = sbi;
 	
 	sb_set_blocksize(sb, 512);
@@ -465,34 +499,26 @@ static int v7_fill_super(struct super_bl
 		goto failed;
 	}
 
-	/* plausibility check on superblock */
-	v7sb = (struct v7_super_block *) bh->b_data;
-	if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
-	    fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
-	    fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
-		goto failed;
+	/* Try PDP-11 UNIX */
+	sbi->s_bytesex = BYTESEX_PDP;
+	if (v7_sanity_check (sb, bh))
+		goto detected;
 
-	/* plausibility check on root inode: it is a directory,
-	   with a nonzero size that is a multiple of 16 */
-	if ((bh2 = sb_bread(sb, 2)) == NULL)
-		goto failed;
-	v7i = (struct sysv_inode *)(bh2->b_data + 64);
-	if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
-	    (fs32_to_cpu(sbi, v7i->i_size) == 0) ||
-	    (fs32_to_cpu(sbi, v7i->i_size) & 017) ||
-	    (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
-	     sizeof(struct sysv_dir_entry)))
-		goto failed;
-	brelse(bh2);
-	bh2 = NULL;
+	/* Try PC/IX, v7/x86 */
+	sbi->s_bytesex = BYTESEX_LE;
+	if (v7_sanity_check (sb, bh))
+		goto detected;
 
+	goto failed;
+
+detected:
 	sbi->s_bh1 = bh;
 	sbi->s_bh2 = bh;
 	if (complete_read_super(sb, silent, 1))
 		return 0;
 
 failed:
-	brelse(bh2);
+	printk("VFS: could not find a valid V7 on %s.\n", sb->s_id);
 	brelse(bh);
 	kfree(sbi);
 	return -EINVAL;
_

Patches currently in -mm which might be from lkundrak@v3.sk are

fs-sysv-add-v7-alias.patch
fs-sysv-v7-adjust-sanity-checks-for-some-volumes.patch
fs-sysv-v7-adjust-sanity-checks-for-some-volumes-checkpatch-fixes.patch
fs-sysv-superc-add-support-for-non-pdp11-v7-filesystems.patch
fs-sysv-superc-add-support-for-non-pdp11-v7-filesystems-checkpatch-fixes.patch