1 files changed, 0 insertions, 189 deletions
diff --git a/fs/ntfs/mst.c b/fs/ntfs/mst.c
deleted file mode 100644
index 16b3c884abfc..000000000000
--- a/fs/ntfs/mst.c
+++ /dev/null
@@ -1,189 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * mst.c - NTFS multi sector transfer protection handling code. Part of the
- *	   Linux-NTFS project.
- *
- * Copyright (c) 2001-2004 Anton Altaparmakov
- */
-
-#include "ntfs.h"
-
-/**
- * post_read_mst_fixup - deprotect multi sector transfer protected data
- * @b:		pointer to the data to deprotect
- * @size:	size in bytes of @b
- *
- * Perform the necessary post read multi sector transfer fixup and detect the
- * presence of incomplete multi sector transfers. - In that case, overwrite the
- * magic of the ntfs record header being processed with "BAAD" (in memory only!)
- * and abort processing.
- *
- * Return 0 on success and -EINVAL on error ("BAAD" magic will be present).
- *
- * NOTE: We consider the absence / invalidity of an update sequence array to
- * mean that the structure is not protected at all and hence doesn't need to
- * be fixed up. Thus, we return success and not failure in this case. This is
- * in contrast to pre_write_mst_fixup(), see below.
- */
-int post_read_mst_fixup(NTFS_RECORD *b, const u32 size)
-{
-	u16 usa_ofs, usa_count, usn;
-	u16 *usa_pos, *data_pos;
-
-	/* Setup the variables. */
-	usa_ofs = le16_to_cpu(b->usa_ofs);
-	/* Decrement usa_count to get number of fixups. */
-	usa_count = le16_to_cpu(b->usa_count) - 1;
-	/* Size and alignment checks. */
-	if ( size & (NTFS_BLOCK_SIZE - 1)	||
-	     usa_ofs & 1			||
-	     usa_ofs + (usa_count * 2) > size	||
-	     (size >> NTFS_BLOCK_SIZE_BITS) != usa_count)
-		return 0;
-	/* Position of usn in update sequence array. */
-	usa_pos = (u16*)b + usa_ofs/sizeof(u16);
-	/*
-	 * The update sequence number which has to be equal to each of the
-	 * u16 values before they are fixed up. Note no need to care for
-	 * endianness since we are comparing and moving data for on disk
-	 * structures which means the data is consistent. - If it is
-	 * consistenty the wrong endianness it doesn't make any difference.
-	 */
-	usn = *usa_pos;
-	/*
-	 * Position in protected data of first u16 that needs fixing up.
-	 */
-	data_pos = (u16*)b + NTFS_BLOCK_SIZE/sizeof(u16) - 1;
-	/*
-	 * Check for incomplete multi sector transfer(s).
-	 */
-	while (usa_count--) {
-		if (*data_pos != usn) {
-			/*
-			 * Incomplete multi sector transfer detected! )-:
-			 * Set the magic to "BAAD" and return failure.
-			 * Note that magic_BAAD is already converted to le32.
-			 */
-			b->magic = magic_BAAD;
-			return -EINVAL;
-		}
-		data_pos += NTFS_BLOCK_SIZE/sizeof(u16);
-	}
-	/* Re-setup the variables. */
-	usa_count = le16_to_cpu(b->usa_count) - 1;
-	data_pos = (u16*)b + NTFS_BLOCK_SIZE/sizeof(u16) - 1;
-	/* Fixup all sectors. */
-	while (usa_count--) {
-		/*
-		 * Increment position in usa and restore original data from
-		 * the usa into the data buffer.
-		 */
-		*data_pos = *(++usa_pos);
-		/* Increment position in data as well. */
-		data_pos += NTFS_BLOCK_SIZE/sizeof(u16);
-	}
-	return 0;
-}
-
-/**
- * pre_write_mst_fixup - apply multi sector transfer protection
- * @b:		pointer to the data to protect
- * @size:	size in bytes of @b
- *
- * Perform the necessary pre write multi sector transfer fixup on the data
- * pointer to by @b of @size.
- *
- * Return 0 if fixup applied (success) or -EINVAL if no fixup was performed
- * (assumed not needed). This is in contrast to post_read_mst_fixup() above.
- *
- * NOTE: We consider the absence / invalidity of an update sequence array to
- * mean that the structure is not subject to protection and hence doesn't need
- * to be fixed up. This means that you have to create a valid update sequence
- * array header in the ntfs record before calling this function, otherwise it
- * will fail (the header needs to contain the position of the update sequence
- * array together with the number of elements in the array). You also need to
- * initialise the update sequence number before calling this function
- * otherwise a random word will be used (whatever was in the record at that
- * position at that time).
- */
-int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size)
-{
-	le16 *usa_pos, *data_pos;
-	u16 usa_ofs, usa_count, usn;
-	le16 le_usn;
-
-	/* Sanity check + only fixup if it makes sense. */
-	if (!b || ntfs_is_baad_record(b->magic) ||
-			ntfs_is_hole_record(b->magic))
-		return -EINVAL;
-	/* Setup the variables. */
-	usa_ofs = le16_to_cpu(b->usa_ofs);
-	/* Decrement usa_count to get number of fixups. */
-	usa_count = le16_to_cpu(b->usa_count) - 1;
-	/* Size and alignment checks. */
-	if ( size & (NTFS_BLOCK_SIZE - 1)	||
-	     usa_ofs & 1			||
-	     usa_ofs + (usa_count * 2) > size	||
-	     (size >> NTFS_BLOCK_SIZE_BITS) != usa_count)
-		return -EINVAL;
-	/* Position of usn in update sequence array. */
-	usa_pos = (le16*)((u8*)b + usa_ofs);
-	/*
-	 * Cyclically increment the update sequence number
-	 * (skipping 0 and -1, i.e. 0xffff).
-	 */
-	usn = le16_to_cpup(usa_pos) + 1;
-	if (usn == 0xffff || !usn)
-		usn = 1;
-	le_usn = cpu_to_le16(usn);
-	*usa_pos = le_usn;
-	/* Position in data of first u16 that needs fixing up. */
-	data_pos = (le16*)b + NTFS_BLOCK_SIZE/sizeof(le16) - 1;
-	/* Fixup all sectors. */
-	while (usa_count--) {
-		/*
-		 * Increment the position in the usa and save the
-		 * original data from the data buffer into the usa.
-		 */
-		*(++usa_pos) = *data_pos;
-		/* Apply fixup to data. */
-		*data_pos = le_usn;
-		/* Increment position in data as well. */
-		data_pos += NTFS_BLOCK_SIZE/sizeof(le16);
-	}
-	return 0;
-}
-
-/**
- * post_write_mst_fixup - fast deprotect multi sector transfer protected data
- * @b:		pointer to the data to deprotect
- *
- * Perform the necessary post write multi sector transfer fixup, not checking
- * for any errors, because we assume we have just used pre_write_mst_fixup(),
- * thus the data will be fine or we would never have gotten here.
- */
-void post_write_mst_fixup(NTFS_RECORD *b)
-{
-	le16 *usa_pos, *data_pos;
-
-	u16 usa_ofs = le16_to_cpu(b->usa_ofs);
-	u16 usa_count = le16_to_cpu(b->usa_count) - 1;
-
-	/* Position of usn in update sequence array. */
-	usa_pos = (le16*)b + usa_ofs/sizeof(le16);
-
-	/* Position in protected data of first u16 that needs fixing up. */
-	data_pos = (le16*)b + NTFS_BLOCK_SIZE/sizeof(le16) - 1;
-
-	/* Fixup all sectors. */
-	while (usa_count--) {
-		/*
-		 * Increment position in usa and restore original data from
-		 * the usa into the data buffer.
-		 */
-		*data_pos = *(++usa_pos);
-
-		/* Increment position in data as well. */
-		data_pos += NTFS_BLOCK_SIZE/sizeof(le16);
-	}
-}