From 66a0fbdc4ced024757027410fa4e9d52e94b32d0 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Tue, 19 Jan 2010 01:12:06 +0100
Subject: [PATCH] libblkid: set minimal size for jfs, reiser, swap and zfs

.. and don't probe for swap or ext. journal on tiny disks.

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 shlibs/blkid/src/blkidP.h                  | 1 +
 shlibs/blkid/src/superblocks/jfs.c         | 1 +
 shlibs/blkid/src/superblocks/reiserfs.c    | 2 ++
 shlibs/blkid/src/superblocks/superblocks.c | 9 +++++++--
 shlibs/blkid/src/superblocks/swap.c        | 2 ++
 shlibs/blkid/src/superblocks/zfs.c         | 1 +
 6 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/shlibs/blkid/src/blkidP.h b/shlibs/blkid/src/blkidP.h
index 4a3ae200..55850349 100644
--- a/shlibs/blkid/src/blkidP.h
+++ b/shlibs/blkid/src/blkidP.h
@@ -155,6 +155,7 @@ struct blkid_idinfo
 	const char	*name;		/* fs, raid or partition table name */
 	int		usage;		/* BLKID_USAGE_* flag */
 	int		flags;		/* BLKID_IDINFO_* flags */
+	int		minsz;		/* minimal device size */
 
 					/* probe function */
 	int		(*probefunc)(blkid_probe pr, const struct blkid_idmag *mag);
diff --git a/shlibs/blkid/src/superblocks/jfs.c b/shlibs/blkid/src/superblocks/jfs.c
index e6e44505..9a49c674 100644
--- a/shlibs/blkid/src/superblocks/jfs.c
+++ b/shlibs/blkid/src/superblocks/jfs.c
@@ -61,6 +61,7 @@ const struct blkid_idinfo jfs_idinfo =
 	.name		= "jfs",
 	.usage		= BLKID_USAGE_FILESYSTEM,
 	.probefunc	= probe_jfs,
+	.minsz		= 16 * 1024 * 1024,
 	.magics		=
 	{
 		{ .magic = "JFS1", .len = 4, .kboff = 32 },
diff --git a/shlibs/blkid/src/superblocks/reiserfs.c b/shlibs/blkid/src/superblocks/reiserfs.c
index 4222a307..921f5237 100644
--- a/shlibs/blkid/src/superblocks/reiserfs.c
+++ b/shlibs/blkid/src/superblocks/reiserfs.c
@@ -98,6 +98,7 @@ const struct blkid_idinfo reiser_idinfo =
 	.name		= "reiserfs",
 	.usage		= BLKID_USAGE_FILESYSTEM,
 	.probefunc	= probe_reiser,
+	.minsz		= 4096 * 512,	/* not sure, this is minimal size of journal */
 	.magics		=
 	{
 		{ .magic = "ReIsErFs",  .len = 8, .kboff = 8,  .sboff = 0x34 },
@@ -114,6 +115,7 @@ const struct blkid_idinfo reiser4_idinfo =
 	.name		= "reiser4",
 	.usage		= BLKID_USAGE_FILESYSTEM,
 	.probefunc	= probe_reiser4,
+	.minsz		= 4096 * 512,	/* not sure, this is minimal size of journal */
 	.magics		=
 	{
 		{ .magic = "ReIsEr4", .len = 7, .kboff = 64 },
diff --git a/shlibs/blkid/src/superblocks/superblocks.c b/shlibs/blkid/src/superblocks/superblocks.c
index dbb48562..689f31bd 100644
--- a/shlibs/blkid/src/superblocks/superblocks.c
+++ b/shlibs/blkid/src/superblocks/superblocks.c
@@ -331,10 +331,15 @@ static int superblocks_probe(blkid_probe pr, struct blkid_chain *chn)
 			continue;
 
 		id = idinfos[i];
+
+		if (id->minsz && id->minsz > pr->size)
+			continue;	/* the device is too small */
+
 		mag = id->magics ? &id->magics[0] : NULL;
 
-		/* don't probe for RAIDs on floppies */
-		if ((id->usage & BLKID_USAGE_RAID) && blkid_probe_is_tiny(pr))
+		/* don't probe for RAIDs, swap or journal on floppies */
+		if ((id->usage & (BLKID_USAGE_RAID | BLKID_USAGE_OTHER)) &&
+		    blkid_probe_is_tiny(pr))
 			continue;
 
 		DBG(DEBUG_LOWPROBE, printf("[%d] %s:\n", i, id->name));
diff --git a/shlibs/blkid/src/superblocks/swap.c b/shlibs/blkid/src/superblocks/swap.c
index 4fb4ab7a..8aaa6f31 100644
--- a/shlibs/blkid/src/superblocks/swap.c
+++ b/shlibs/blkid/src/superblocks/swap.c
@@ -99,6 +99,7 @@ const struct blkid_idinfo swap_idinfo =
 	.name		= "swap",
 	.usage		= BLKID_USAGE_OTHER,
 	.probefunc	= probe_swap,
+	.minsz		= 10 * 4096,	/* 10 pages */
 	.magics		=
 	{
 		{ "SWAP-SPACE", 10, 0,  0xff6 },
@@ -121,6 +122,7 @@ const struct blkid_idinfo swsuspend_idinfo =
 	.name		= "swsuspend",
 	.usage		= BLKID_USAGE_OTHER,
 	.probefunc	= probe_swsuspend,
+	.minsz		= 10 * 4096,	/* 10 pages */
 	.magics		=
 	{
 		{ "S1SUSPEND", 9, 0, 0xff6 },
diff --git a/shlibs/blkid/src/superblocks/zfs.c b/shlibs/blkid/src/superblocks/zfs.c
index 2d626427..0f580262 100644
--- a/shlibs/blkid/src/superblocks/zfs.c
+++ b/shlibs/blkid/src/superblocks/zfs.c
@@ -54,6 +54,7 @@ const struct blkid_idinfo zfs_idinfo =
 	.name		= "zfs",
 	.usage		= BLKID_USAGE_FILESYSTEM,
 	.probefunc	= probe_zfs,
+	.minsz		= 64 * 1024 * 1024,
 	.magics		=
 	{
 		{ .magic = "\0\0\x02\xf5\xb0\x07\xb1\x0c", .len = 8, .kboff = 8 },
-- 
2.39.5