Fixed MTP to work with TWRP

block/partitions/check.c

@@ -0,0 +1,197 @@
+/*
+ *  fs/partitions/check.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ *
+ *  We now have independent partition support from the
+ *  block drivers, which allows all the partition code to
+ *  be grouped in one location, and it to be mostly self
+ *  contained.
+ *
+ *  Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
+ */
+
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/ctype.h>
+#include <linux/genhd.h>
+
+#include "check.h"
+
+#include "acorn.h"
+#include "amiga.h"
+#include "atari.h"
+#include "ldm.h"
+#include "mac.h"
+#include "msdos.h"
+#include "osf.h"
+#include "sgi.h"
+#include "sun.h"
+#include "ibm.h"
+#include "ultrix.h"
+#include "efi.h"
+#include "karma.h"
+#include "sysv68.h"
+#include "cmdline.h"
+
+int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
+
+static int (*check_part[])(struct parsed_partitions *) = {
+	/*
+	 * Probe partition formats with tables at disk address 0
+	 * that also have an ADFS boot block at 0xdc0.
+	 */
+#ifdef CONFIG_ACORN_PARTITION_ICS
+	adfspart_check_ICS,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+	adfspart_check_POWERTEC,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_EESOX
+	adfspart_check_EESOX,
+#endif
+
+	/*
+	 * Now move on to formats that only have partition info at
+	 * disk address 0xdc0.  Since these may also have stale
+	 * PC/BIOS partition tables, they need to come before
+	 * the msdos entry.
+	 */
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+	adfspart_check_CUMANA,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+	adfspart_check_ADFS,
+#endif
+
+#ifdef CONFIG_CMDLINE_PARTITION
+	cmdline_partition,
+#endif
+#ifdef CONFIG_EFI_PARTITION
+	efi_partition,		/* this must come before msdos */
+#endif
+#ifdef CONFIG_SGI_PARTITION
+	sgi_partition,
+#endif
+#ifdef CONFIG_LDM_PARTITION
+	ldm_partition,		/* this must come before msdos */
+#endif
+#ifdef CONFIG_MSDOS_PARTITION
+	msdos_partition,
+#endif
+#ifdef CONFIG_OSF_PARTITION
+	osf_partition,
+#endif
+#ifdef CONFIG_SUN_PARTITION
+	sun_partition,
+#endif
+#ifdef CONFIG_AMIGA_PARTITION
+	amiga_partition,
+#endif
+#ifdef CONFIG_ATARI_PARTITION
+	atari_partition,
+#endif
+#ifdef CONFIG_MAC_PARTITION
+	mac_partition,
+#endif
+#ifdef CONFIG_ULTRIX_PARTITION
+	ultrix_partition,
+#endif
+#ifdef CONFIG_IBM_PARTITION
+	ibm_partition,
+#endif
+#ifdef CONFIG_KARMA_PARTITION
+	karma_partition,
+#endif
+#ifdef CONFIG_SYSV68_PARTITION
+	sysv68_partition,
+#endif
+	NULL
+};
+
+static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
+{
+	struct parsed_partitions *state;
+	int nr;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+
+	nr = disk_max_parts(hd);
+	state->parts = vzalloc(nr * sizeof(state->parts[0]));
+	if (!state->parts) {
+		kfree(state);
+		return NULL;
+	}
+
+	state->limit = nr;
+
+	return state;
+}
+
+void free_partitions(struct parsed_partitions *state)
+{
+	vfree(state->parts);
+	kfree(state);
+}
+
+struct parsed_partitions *
+check_partition(struct gendisk *hd, struct block_device *bdev)
+{
+	struct parsed_partitions *state;
+	int i, res, err;
+
+	state = allocate_partitions(hd);
+	if (!state)
+		return NULL;
+	state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
+	if (!state->pp_buf) {
+		free_partitions(state);
+		return NULL;
+	}
+	state->pp_buf[0] = '\0';
+
+	state->bdev = bdev;
+	disk_name(hd, 0, state->name);
+	snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
+	if (isdigit(state->name[strlen(state->name)-1]))
+		sprintf(state->name, "p");
+
+	i = res = err = 0;
+	while (!res && check_part[i]) {
+		memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
+		res = check_part[i++](state);
+		if (res < 0) {
+			/* We have hit an I/O error which we don't report now.
+		 	* But record it, and let the others do their job.
+		 	*/
+			err = res;
+			res = 0;
+		}
+
+	}
+	if (res > 0) {
+		printk(KERN_INFO "%s", state->pp_buf);
+
+		free_page((unsigned long)state->pp_buf);
+		return state;
+	}
+	if (state->access_beyond_eod)
+		err = -ENOSPC;
+	if (err)
+	/* The partition is unrecognized. So report I/O errors if there were any */
+		res = err;
+	if (!res)
+		strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
+	else if (warn_no_part)
+		strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
+
+	printk(KERN_INFO "%s", state->pp_buf);
+
+	free_page((unsigned long)state->pp_buf);
+	free_partitions(state);
+	return ERR_PTR(res);
+}