Commit 115380f9 authored by Namjae Jeon's avatar Namjae Jeon
Browse files

ntfs: update mft operations 



Refactors MFT record handling to use folio APIs with consistency
validation, and improving allocation extension and writeback paths
for  and .

Acked-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarHyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
parent af0db57d

fs/ntfs/mft.c

+1257 −1242

File changed.

Preview size limit exceeded, changes collapsed.

fs/ntfs/mst.c

+35 −30
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * mst.c - NTFS multi sector transfer protection handling code. Part of the

 *	   Linux-NTFS project.

 * NTFS multi sector transfer protection handling code.

 *

 * Copyright (c) 2001-2004 Anton Altaparmakov

 */



#include <linux/ratelimit.h>



#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
@@ -25,7 +26,7 @@ 
 * 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)

int post_read_mst_fixup(struct ntfs_record *b, const u32 size)

{

	u16 usa_ofs, usa_count, usn;

	u16 *usa_pos, *data_pos;
@@ -35,8 +36,7 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size) 
	/* 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			||

	if (size & (NTFS_BLOCK_SIZE - 1) || usa_ofs & 1	||

	    usa_ofs + (usa_count * 2) > size ||

	    (size >> NTFS_BLOCK_SIZE_BITS) != usa_count)

		return 0;
@@ -59,6 +59,12 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size) 
	 */

	while (usa_count--) {

		if (*data_pos != usn) {

			struct mft_record *m = (struct mft_record *)b;



			pr_err_ratelimited("ntfs: Incomplete multi sector transfer detected! (Record magic : 0x%x, mft number : 0x%x, base mft number : 0x%lx, mft in use : %d, data : 0x%x, usn 0x%x)\n",

					le32_to_cpu(m->magic), le32_to_cpu(m->mft_record_number),

					MREF_LE(m->base_mft_record), m->flags & MFT_RECORD_IN_USE,

					*data_pos, usn);

			/*

			 * Incomplete multi sector transfer detected! )-:

			 * Set the magic to "BAAD" and return failure.
@@ -85,7 +91,7 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size) 
	return 0;

}



/**

/*

 * pre_write_mst_fixup - apply multi sector transfer protection

 * @b:		pointer to the data to protect

 * @size:	size in bytes of @b
@@ -106,11 +112,11 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size) 
 * 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)

int pre_write_mst_fixup(struct ntfs_record *b, const u32 size)

{

	le16 *usa_pos, *data_pos;

	__le16 *usa_pos, *data_pos;

	u16 usa_ofs, usa_count, usn;

	le16 le_usn;

	__le16 le_usn;



	/* Sanity check + only fixup if it makes sense. */

	if (!b || ntfs_is_baad_record(b->magic) ||
@@ -121,13 +127,12 @@ int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size) 
	/* 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			||

	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);

	usa_pos = (__le16 *)((u8 *)b + usa_ofs);

	/*

	 * Cyclically increment the update sequence number

	 * (skipping 0 and -1, i.e. 0xffff).
@@ -138,7 +143,7 @@ int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size) 
	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;

	data_pos = (__le16 *)b + NTFS_BLOCK_SIZE/sizeof(__le16) - 1;

	/* Fixup all sectors. */

	while (usa_count--) {

		/*
@@ -149,12 +154,12 @@ int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size) 
		/* Apply fixup to data. */

		*data_pos = le_usn;

		/* Increment position in data as well. */

		data_pos += NTFS_BLOCK_SIZE/sizeof(le16);

		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

 *
@@ -162,18 +167,18 @@ int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size) 
 * 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)

void post_write_mst_fixup(struct ntfs_record *b)

{

	le16 *usa_pos, *data_pos;

	__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);

	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;

	data_pos = (__le16 *)b + NTFS_BLOCK_SIZE/sizeof(__le16) - 1;



	/* Fixup all sectors. */

	while (usa_count--) {
@@ -184,6 +189,6 @@ void post_write_mst_fixup(NTFS_RECORD *b) 
		*data_pos = *(++usa_pos);



		/* Increment position in data as well. */

		data_pos += NTFS_BLOCK_SIZE/sizeof(le16);

		data_pos += NTFS_BLOCK_SIZE/sizeof(__le16);

	}

}