support for mount by label (not yet tested)

Also adds findfs applet. Closes bug 1143.

1 files changed, 125 insertions, 0 deletions

diff --git a/util-linux/volume_id/sysv.c b/util-linux/volume_id/sysv.c
new file mode 100644
index 0000000..71c0fd4
--- /dev/null
+++ b/util-linux/volume_id/sysv.c
@@ -0,0 +1,125 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *	This library is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU Lesser General Public
+ *	License as published by the Free Software Foundation; either
+ *	version 2.1 of the License, or (at your option) any later version.
+ *
+ *	This library is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *	Lesser General Public License for more details.
+ *
+ *	You should have received a copy of the GNU Lesser General Public
+ *	License along with this library; if not, write to the Free Software
+ *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "volume_id_internal.h"
+
+#define SYSV_NICINOD			100
+#define SYSV_NICFREE			50
+
+struct sysv_super
+{
+	uint16_t	s_isize;
+	uint16_t	s_pad0;
+	uint32_t	s_fsize;
+	uint16_t	s_nfree;
+	uint16_t	s_pad1;
+	uint32_t	s_free[SYSV_NICFREE];
+	uint16_t	s_ninode;
+	uint16_t	s_pad2;
+	uint16_t	s_inode[SYSV_NICINOD];
+	uint8_t		s_flock;
+	uint8_t		s_ilock;
+	uint8_t		s_fmod;
+	uint8_t		s_ronly;
+	uint32_t	s_time;
+	uint16_t	s_dinfo[4];
+	uint32_t	s_tfree;
+	uint16_t	s_tinode;
+	uint16_t	s_pad3;
+	uint8_t		s_fname[6];
+	uint8_t		s_fpack[6];
+	uint32_t	s_fill[12];
+	uint32_t	s_state;
+	uint32_t	s_magic;
+	uint32_t	s_type;
+} __attribute__((__packed__));
+
+#define XENIX_NICINOD				100
+#define XENIX_NICFREE				100
+
+struct xenix_super {
+	uint16_t	s_isize;
+	uint32_t	s_fsize;
+	uint16_t	s_nfree;
+	uint32_t	s_free[XENIX_NICFREE];
+	uint16_t	s_ninode;
+	uint16_t	s_inode[XENIX_NICINOD];
+	uint8_t		s_flock;
+	uint8_t		s_ilock;
+	uint8_t		s_fmod;
+	uint8_t		s_ronly;
+	uint32_t	s_time;
+	uint32_t	s_tfree;
+	uint16_t	s_tinode;
+	uint16_t	s_dinfo[4];
+	uint8_t		s_fname[6];
+	uint8_t		s_fpack[6];
+	uint8_t		s_clean;
+	uint8_t		s_fill[371];
+	uint32_t	s_magic;
+	uint32_t	s_type;
+} __attribute__((__packed__));
+
+#define SYSV_SUPERBLOCK_BLOCK			0x01
+#define SYSV_MAGIC				0xfd187e20
+#define XENIX_SUPERBLOCK_BLOCK			0x18
+#define XENIX_MAGIC				0x2b5544
+#define SYSV_MAX_BLOCKSIZE			0x800
+
+int volume_id_probe_sysv(struct volume_id *id, uint64_t off)
+{
+	struct sysv_super *vs;
+	struct xenix_super *xs;
+	unsigned boff;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
+		vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
+		if (vs == NULL)
+			return -1;
+
+		if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
+			volume_id_set_label_raw(id, vs->s_fname, 6);
+			volume_id_set_label_string(id, vs->s_fname, 6);
+			id->type = "sysv";
+			goto found;
+		}
+	}
+
+	for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
+		xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
+		if (xs == NULL)
+			return -1;
+
+		if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
+			volume_id_set_label_raw(id, xs->s_fname, 6);
+			volume_id_set_label_string(id, xs->s_fname, 6);
+			id->type = "xenix";
+			goto found;
+		}
+	}
+
+	return -1;
+
+ found:
+	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+	return 0;
+}