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ntfs: update mft operations

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

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon
2026-02-13 10:39:43 +09:00
parent af0db57d42
commit 115380f9a2
2 changed files with 1284 additions and 1264 deletions
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2483
fs/ntfs/mft.c
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File diff suppressed because it is too large Load Diff

65
fs/ntfs/mst.c
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@@ -1,14 +1,15 @@
// 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;
@@ -35,13 +36,12 @@ 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 ||
usa_ofs + (usa_count * 2) > size ||
(size >> NTFS_BLOCK_SIZE_BITS) != usa_count)
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);
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
@@ -53,12 +53,18 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size)
/*
* Position in protected data of first u16 that needs fixing up.
*/
data_pos = (u16*)b + NTFS_BLOCK_SIZE/sizeof(u16) - 1;
data_pos = (u16 *)b + NTFS_BLOCK_SIZE / sizeof(u16) - 1;
/*
* Check for incomplete multi sector transfer(s).
*/
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.
@@ -67,11 +73,11 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size)
b->magic = magic_BAAD;
return -EINVAL;
}
data_pos += NTFS_BLOCK_SIZE/sizeof(u16);
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;
data_pos = (u16 *)b + NTFS_BLOCK_SIZE / sizeof(u16) - 1;
/* Fixup all sectors. */
while (usa_count--) {
/*
@@ -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
@@ -106,28 +112,27 @@ 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) ||
ntfs_is_hole_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)
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);
}
}