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From:   Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
To:     <linux-fsdevel@vger.kernel.org>
CC:     <viro@zeniv.linux.org.uk>, <linux-kernel@vger.kernel.org>,
        <pali@kernel.org>, <dsterba@suse.cz>, <aaptel@suse.com>,
        <willy@infradead.org>, <rdunlap@infradead.org>, <joe@perches.com>,
        <mark@harmstone.com>, <nborisov@suse.com>,
        <linux-ntfs-dev@lists.sourceforge.net>, <anton@tuxera.com>,
        <dan.carpenter@oracle.com>, <hch@lst.de>, <ebiggers@kernel.org>,
        <andy.lavr@gmail.com>,
        Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Subject: [PATCH v20 07/10] fs/ntfs3: Add NTFS journal
Date:   Fri, 5 Feb 2021 18:02:41 +0300
Message-ID: <20210205150244.542628-8-almaz.alexandrovich@paragon-software.com>
In-Reply-To: <20210205150244.542628-1-almaz.alexandrovich@paragon-software.com>
References: <20210205150244.542628-1-almaz.alexandrovich@paragon-software.com>
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This adds NTFS journal

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---
 fs/ntfs3/fslog.c | 5204 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 5204 insertions(+)
 create mode 100644 fs/ntfs3/fslog.c

diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
new file mode 100644
index 000000000000..140847de2e12
--- /dev/null
+++ b/fs/ntfs3/fslog.c
@@ -0,0 +1,5204 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/hash.h>
+#include <linux/nls.h>
+#include <linux/random.h>
+#include <linux/ratelimit.h>
+#include <linux/slab.h>
+
+#include "debug.h"
+#include "ntfs.h"
+#include "ntfs_fs.h"
+
+/*
+ * LOG FILE structs
+ */
+
+// clang-format off
+
+#define MaxLogFileSize     0x100000000ull
+#define DefaultLogPageSize 4096
+#define MinLogRecordPages  0x30
+
+struct RESTART_HDR {
+	struct NTFS_RECORD_HEADER rhdr; // 'RSTR'
+	__le32 sys_page_size; // 0x10: Page size of the system which initialized the log
+	__le32 page_size;     // 0x14: Log page size used for this log file
+	__le16 ra_off;        // 0x18:
+	__le16 minor_ver;     // 0x1A:
+	__le16 major_ver;     // 0x1C:
+	__le16 fixups[1];
+};
+
+#define LFS_NO_CLIENT 0xffff
+#define LFS_NO_CLIENT_LE cpu_to_le16(0xffff)
+
+struct CLIENT_REC {
+	__le64 oldest_lsn;
+	__le64 restart_lsn; // 0x08:
+	__le16 prev_client; // 0x10:
+	__le16 next_client; // 0x12:
+	__le16 seq_num;     // 0x14:
+	u8 align[6];        // 0x16
+	__le32 name_bytes;  // 0x1C: in bytes
+	__le16 name[32];    // 0x20: name of client
+};
+
+static_assert(sizeof(struct CLIENT_REC) == 0x60);
+
+/* Two copies of these will exist at the beginning of the log file */
+struct RESTART_AREA {
+	__le64 current_lsn;    // 0x00: Current logical end of log file
+	__le16 log_clients;    // 0x08: Maximum number of clients
+	__le16 client_idx[2];  // 0x0A: free/use index into the client record arrays
+	__le16 flags;          // 0x0E: See RESTART_SINGLE_PAGE_IO
+	__le32 seq_num_bits;   // 0x10: the number of bits in sequence number.
+	__le16 ra_len;         // 0x14:
+	__le16 client_off;     // 0x16:
+	__le64 l_size;         // 0x18: Usable log file size.
+	__le32 last_lsn_data_len; // 0x20:
+	__le16 rec_hdr_len;    // 0x24: log page data offset
+	__le16 data_off;       // 0x26: log page data length
+	__le32 open_log_count; // 0x28:
+	__le32 align[5];       // 0x2C:
+	struct CLIENT_REC clients[1]; // 0x40:
+};
+
+struct LOG_REC_HDR {
+	__le16 redo_op;      // 0x00:  NTFS_LOG_OPERATION
+	__le16 undo_op;      // 0x02:  NTFS_LOG_OPERATION
+	__le16 redo_off;     // 0x04:  Offset to Redo record
+	__le16 redo_len;     // 0x06:  Redo length
+	__le16 undo_off;     // 0x08:  Offset to Undo record
+	__le16 undo_len;     // 0x0A:  Undo length
+	__le16 target_attr;  // 0x0C:
+	__le16 lcns_follow;  // 0x0E:
+	__le16 record_off;   // 0x10:
+	__le16 attr_off;     // 0x12:
+	__le16 cluster_off;  // 0x14:
+	__le16 reserved;     // 0x16:
+	__le64 target_vcn;   // 0x18:
+	__le64 page_lcns[1]; // 0x20:
+};
+
+static_assert(sizeof(struct LOG_REC_HDR) == 0x28);
+
+#define RESTART_ENTRY_ALLOCATED    0xFFFFFFFF
+#define RESTART_ENTRY_ALLOCATED_LE cpu_to_le32(0xFFFFFFFF)
+
+struct RESTART_TABLE {
+	__le16 size;       // 0x00:  In bytes
+	__le16 used;       // 0x02: entries
+	__le16 total;      // 0x04: entries
+	__le16 res[3];     // 0x06:
+	__le32 free_goal;  // 0x0C:
+	__le32 first_free; // 0x10
+	__le32 last_free;  // 0x14
+
+};
+
+static_assert(sizeof(struct RESTART_TABLE) == 0x18);
+
+struct ATTR_NAME_ENTRY {
+	__le16 off; // offset in the Open attribute Table
+	__le16 name_bytes;
+	__le16 name[1];
+};
+
+struct OPEN_ATTR_ENRTY {
+	__le32 next;            // 0x00: RESTART_ENTRY_ALLOCATED if allocated
+	__le32 bytes_per_index; // 0x04:
+	enum ATTR_TYPE type;    // 0x08:
+	u8 is_dirty_pages;      // 0x0C:
+	u8 is_attr_name;        // 0x0B: Faked field to manage 'ptr'
+	u8 name_len;            // 0x0C: Faked field to manage 'ptr'
+	u8 res;
+	struct MFT_REF ref; // 0x10: File Reference of file containing attribute
+	__le64 open_record_lsn; // 0x18:
+	void *ptr;              // 0x20:
+};
+
+/* 32 bit version of 'struct OPEN_ATTR_ENRTY' */
+struct OPEN_ATTR_ENRTY_32 {
+	__le32 next;            // 0x00: RESTART_ENTRY_ALLOCATED if allocated
+	__le32 ptr;             // 0x04:
+	struct MFT_REF ref;     // 0x08:
+	__le64 open_record_lsn; // 0x10:
+	u8 is_dirty_pages;      // 0x18:
+	u8 is_attr_name;        // 0x19
+	u8 res1[2];
+	enum ATTR_TYPE type;    // 0x1C:
+	u8 name_len;            // 0x20:  in wchar
+	u8 res2[3];
+	__le32 AttributeName;   // 0x24:
+	__le32 bytes_per_index; // 0x28:
+};
+
+#define SIZEOF_OPENATTRIBUTEENTRY0 0x2c
+// static_assert( 0x2C == sizeof(struct OPEN_ATTR_ENRTY_32) );
+static_assert(sizeof(struct OPEN_ATTR_ENRTY) < SIZEOF_OPENATTRIBUTEENTRY0);
+
+/*
+ * One entry exists in the Dirty Pages Table for each page which is dirty at the
+ * time the Restart Area is written
+ */
+struct DIR_PAGE_ENTRY {
+	__le32 next;         // 0x00:  RESTART_ENTRY_ALLOCATED if allocated
+	__le32 target_attr;  // 0x04:  Index into the Open attribute Table
+	__le32 transfer_len; // 0x08:
+	__le32 lcns_follow;  // 0x0C:
+	__le64 vcn;          // 0x10:  Vcn of dirty page
+	__le64 oldest_lsn;   // 0x18:
+	__le64 page_lcns[1]; // 0x20:
+};
+
+static_assert(sizeof(struct DIR_PAGE_ENTRY) == 0x28);
+
+/* 32 bit version of 'struct DIR_PAGE_ENTRY' */
+struct DIR_PAGE_ENTRY_32 {
+	__le32 next;         // 0x00:  RESTART_ENTRY_ALLOCATED if allocated
+	__le32 target_attr;  // 0x04:  Index into the Open attribute Table
+	__le32 transfer_len; // 0x08:
+	__le32 lcns_follow;  // 0x0C:
+	__le32 reserved;     // 0x10:
+	__le32 vcn_low;      // 0x14:  Vcn of dirty page
+	__le32 vcn_hi;       // 0x18:  Vcn of dirty page
+	__le32 oldest_lsn_low; // 0x1C:
+	__le32 oldest_lsn_hi; // 0x1C:
+	__le32 page_lcns_low; // 0x24:
+	__le32 page_lcns_hi; // 0x24:
+};
+
+static_assert(offsetof(struct DIR_PAGE_ENTRY_32, vcn_low) == 0x14);
+static_assert(sizeof(struct DIR_PAGE_ENTRY_32) == 0x2c);
+
+enum transact_state {
+	TransactionUninitialized = 0,
+	TransactionActive,
+	TransactionPrepared,
+	TransactionCommitted
+};
+
+struct TRANSACTION_ENTRY {
+	__le32 next;          // 0x00: RESTART_ENTRY_ALLOCATED if allocated
+	u8 transact_state;    // 0x04:
+	u8 reserved[3];       // 0x05:
+	__le64 first_lsn;     // 0x08:
+	__le64 prev_lsn;      // 0x10:
+	__le64 undo_next_lsn; // 0x18:
+	__le32 undo_records;  // 0x20: Number of undo log records pending abort
+	__le32 undo_len;      // 0x24: Total undo size
+};
+
+static_assert(sizeof(struct TRANSACTION_ENTRY) == 0x28);
+
+struct NTFS_RESTART {
+	__le32 major_ver;             // 0x00:
+	__le32 minor_ver;             // 0x04:
+	__le64 check_point_start;     // 0x08:
+	__le64 open_attr_table_lsn;   // 0x10:
+	__le64 attr_names_lsn;        // 0x18:
+	__le64 dirty_pages_table_lsn; // 0x20:
+	__le64 transact_table_lsn;    // 0x28:
+	__le32 open_attr_len;         // 0x30: In bytes
+	__le32 attr_names_len;        // 0x34: In bytes
+	__le32 dirty_pages_len;       // 0x38: In bytes
+	__le32 transact_table_len;    // 0x3C: In bytes
+};
+
+static_assert(sizeof(struct NTFS_RESTART) == 0x40);
+
+struct NEW_ATTRIBUTE_SIZES {
+	__le64 alloc_size;
+	__le64 valid_size;
+	__le64 data_size;
+	__le64 total_size;
+};
+
+struct BITMAP_RANGE {
+	__le32 bitmap_off;
+	__le32 bits;
+};
+
+struct LCN_RANGE {
+	__le64 lcn;
+	__le64 len;
+};
+
+/* The following type defines the different log record types */
+#define LfsClientRecord  cpu_to_le32(1)
+#define LfsClientRestart cpu_to_le32(2)
+
+/* This is used to uniquely identify a client for a particular log file */
+struct CLIENT_ID {
+	__le16 seq_num;
+	__le16 client_idx;
+};
+
+/* This is the header that begins every Log Record in the log file */
+struct LFS_RECORD_HDR {
+	__le64 this_lsn;    // 0x00:
+	__le64 client_prev_lsn;  // 0x08:
+	__le64 client_undo_next_lsn; // 0x10:
+	__le32 client_data_len;  // 0x18:
+	struct CLIENT_ID client; // 0x1C: Owner of this log record
+	__le32 record_type; // 0x20: LfsClientRecord or LfsClientRestart
+	__le32 transact_id; // 0x24:
+	__le16 flags;       // 0x28:	LOG_RECORD_MULTI_PAGE
+	u8 align[6];        // 0x2A:
+};
+
+#define LOG_RECORD_MULTI_PAGE cpu_to_le16(1)
+
+static_assert(sizeof(struct LFS_RECORD_HDR) == 0x30);
+
+struct LFS_RECORD {
+	__le16 next_record_off; // 0x00: Offset of the free space in the page
+	u8 align[6];         // 0x02:
+	__le64 last_end_lsn; // 0x08: lsn for the last log record which ends on the page
+};
+
+static_assert(sizeof(struct LFS_RECORD) == 0x10);
+
+struct RECORD_PAGE_HDR {
+	struct NTFS_RECORD_HEADER rhdr; // 'RCRD'
+	__le32 rflags;     // 0x10:  See LOG_PAGE_LOG_RECORD_END
+	__le16 page_count; // 0x14:
+	__le16 page_pos;   // 0x16:
+	struct LFS_RECORD record_hdr; // 0x18
+	__le16 fixups[10]; // 0x28
+	__le32 file_off;   // 0x3c: used when major version >= 2
+};
+
+// clang-format on
+
+// Page contains the end of a log record
+#define LOG_PAGE_LOG_RECORD_END cpu_to_le32(0x00000001)
+
+static inline bool is_log_record_end(const struct RECORD_PAGE_HDR *hdr)
+{
+	return hdr->rflags & LOG_PAGE_LOG_RECORD_END;
+}
+
+static_assert(offsetof(struct RECORD_PAGE_HDR, file_off) == 0x3c);
+
+/*
+ * END of NTFS LOG structures
+ */
+
+/* Define some tuning parameters to keep the restart tables a reasonable size */
+#define INITIAL_NUMBER_TRANSACTIONS 5
+
+enum NTFS_LOG_OPERATION {
+
+	Noop = 0x00,
+	CompensationLogRecord = 0x01,
+	InitializeFileRecordSegment = 0x02,
+	DeallocateFileRecordSegment = 0x03,
+	WriteEndOfFileRecordSegment = 0x04,
+	CreateAttribute = 0x05,
+	DeleteAttribute = 0x06,
+	UpdateResidentValue = 0x07,
+	UpdateNonresidentValue = 0x08,
+	UpdateMappingPairs = 0x09,
+	DeleteDirtyClusters = 0x0A,
+	SetNewAttributeSizes = 0x0B,
+	AddIndexEntryRoot = 0x0C,
+	DeleteIndexEntryRoot = 0x0D,
+	AddIndexEntryAllocation = 0x0E,
+	DeleteIndexEntryAllocation = 0x0F,
+	WriteEndOfIndexBuffer = 0x10,
+	SetIndexEntryVcnRoot = 0x11,
+	SetIndexEntryVcnAllocation = 0x12,
+	UpdateFileNameRoot = 0x13,
+	UpdateFileNameAllocation = 0x14,
+	SetBitsInNonresidentBitMap = 0x15,
+	ClearBitsInNonresidentBitMap = 0x16,
+	HotFix = 0x17,
+	EndTopLevelAction = 0x18,
+	PrepareTransaction = 0x19,
+	CommitTransaction = 0x1A,
+	ForgetTransaction = 0x1B,
+	OpenNonresidentAttribute = 0x1C,
+	OpenAttributeTableDump = 0x1D,
+	AttributeNamesDump = 0x1E,
+	DirtyPageTableDump = 0x1F,
+	TransactionTableDump = 0x20,
+	UpdateRecordDataRoot = 0x21,
+	UpdateRecordDataAllocation = 0x22,
+
+	UpdateRelativeDataInIndex =
+		0x23, // NtOfsRestartUpdateRelativeDataInIndex
+	UpdateRelativeDataInIndex2 = 0x24,
+	ZeroEndOfFileRecord = 0x25,
+};
+
+/*
+ * Array for log records which require a target attribute
+ * A true indicates that the corresponding restart operation requires a target attribute
+ */
+static const u8 AttributeRequired[] = {
+	0xFC, 0xFB, 0xFF, 0x10, 0x06,
+};
+
+static inline bool is_target_required(u16 op)
+{
+	bool ret = op <= UpdateRecordDataAllocation &&
+		   (AttributeRequired[op >> 3] >> (op & 7) & 1);
+	return ret;
+}
+
+static inline bool can_skip_action(enum NTFS_LOG_OPERATION op)
+{
+	switch (op) {
+	case Noop:
+	case DeleteDirtyClusters:
+	case HotFix:
+	case EndTopLevelAction:
+	case PrepareTransaction:
+	case CommitTransaction:
+	case ForgetTransaction:
+	case CompensationLogRecord:
+	case OpenNonresidentAttribute:
+	case OpenAttributeTableDump:
+	case AttributeNamesDump:
+	case DirtyPageTableDump:
+	case TransactionTableDump:
+		return true;
+	default:
+		return false;
+	}
+}
+
+enum { lcb_ctx_undo_next, lcb_ctx_prev, lcb_ctx_next };
+
+/* bytes per restart table */
+static inline u32 bytes_per_rt(const struct RESTART_TABLE *rt)
+{
+	return le16_to_cpu(rt->used) * le16_to_cpu(rt->size) +
+	       sizeof(struct RESTART_TABLE);
+}
+
+/* log record length */
+static inline u32 lrh_length(const struct LOG_REC_HDR *lr)
+{
+	u16 t16 = le16_to_cpu(lr->lcns_follow);
+
+	return t16 > 1 ? sizeof(struct LOG_REC_HDR) + (t16 - 1) * sizeof(u64) :
+			 sizeof(struct LOG_REC_HDR);
+}
+
+struct lcb {
+	struct LFS_RECORD_HDR *lrh; // Log record header of the current lsn
+	struct LOG_REC_HDR *log_rec;
+	u32 ctx_mode; // lcb_ctx_undo_next/lcb_ctx_prev/lcb_ctx_next
+	struct CLIENT_ID client;
+	bool alloc; // if true the we should deallocate 'log_rec'
+};
+
+static void lcb_put(struct lcb *lcb)
+{
+	if (lcb->alloc)
+		ntfs_free(lcb->log_rec);
+	ntfs_free(lcb->lrh);
+	ntfs_free(lcb);
+}
+
+/*
+ * oldest_client_lsn
+ *
+ * find the oldest lsn from active clients.
+ */
+static inline void oldest_client_lsn(const struct CLIENT_REC *ca,
+				     __le16 next_client, u64 *oldest_lsn)
+{
+	while (next_client != LFS_NO_CLIENT_LE) {
+		const struct CLIENT_REC *cr = ca + le16_to_cpu(next_client);
+		u64 lsn = le64_to_cpu(cr->oldest_lsn);
+
+		/* ignore this block if it's oldest lsn is 0 */
+		if (lsn && lsn < *oldest_lsn)
+			*oldest_lsn = lsn;
+
+		next_client = cr->next_client;
+	}
+}
+
+static inline bool is_rst_page_hdr_valid(u32 file_off,
+					 const struct RESTART_HDR *rhdr)
+{
+	u32 sys_page = le32_to_cpu(rhdr->sys_page_size);
+	u32 page_size = le32_to_cpu(rhdr->page_size);
+	u32 end_usa;
+	u16 ro;
+
+	if (sys_page < SECTOR_SIZE || page_size < SECTOR_SIZE ||
+	    sys_page & (sys_page - 1) || page_size & (page_size - 1)) {
+		return false;
+	}
+
+	/* Check that if the file offset isn't 0, it is the system page size */
+	if (file_off && file_off != sys_page)
+		return false;
+
+	/* Check support version 1.1+ */
+	if (le16_to_cpu(rhdr->major_ver) <= 1 && !rhdr->minor_ver)
+		return false;
+
+	if (le16_to_cpu(rhdr->major_ver) > 2)
+		return false;
+
+	ro = le16_to_cpu(rhdr->ra_off);
+	if (!IsQuadAligned(ro) || ro > sys_page)
+		return false;
+
+	end_usa = ((sys_page >> SECTOR_SHIFT) + 1) * sizeof(short);
+	end_usa += le16_to_cpu(rhdr->rhdr.fix_off);
+
+	if (ro < end_usa)
+		return false;
+
+	return true;
+}
+
+static inline bool is_rst_area_valid(const struct RESTART_HDR *rhdr)
+{
+	const struct RESTART_AREA *ra;
+	u16 cl, fl, ul;
+	u32 off, l_size, file_dat_bits, file_size_round;
+	u16 ro = le16_to_cpu(rhdr->ra_off);
+	u32 sys_page = le32_to_cpu(rhdr->sys_page_size);
+
+	if (ro + offsetof(struct RESTART_AREA, l_size) >
+	    SECTOR_SIZE - sizeof(short))
+		return false;
+
+	ra = Add2Ptr(rhdr, ro);
+	cl = le16_to_cpu(ra->log_clients);
+
+	if (cl > 1)
+		return false;
+
+	off = le16_to_cpu(ra->client_off);
+
+	if (!IsQuadAligned(off) || ro + off > SECTOR_SIZE - sizeof(short))
+		return false;
+
+	off += cl * sizeof(struct CLIENT_REC);
+
+	if (off > sys_page)
+		return false;
+
+	/*
+	 * Check the restart length field and whether the entire
+	 * restart area is contained that length
+	 */
+	if (le16_to_cpu(rhdr->ra_off) + le16_to_cpu(ra->ra_len) > sys_page ||
+	    off > le16_to_cpu(ra->ra_len)) {
+		return false;
+	}
+
+	/*
+	 * As a final check make sure that the use list and the free list
+	 * are either empty or point to a valid client
+	 */
+	fl = le16_to_cpu(ra->client_idx[0]);
+	ul = le16_to_cpu(ra->client_idx[1]);
+	if ((fl != LFS_NO_CLIENT && fl >= cl) ||
+	    (ul != LFS_NO_CLIENT && ul >= cl))
+		return false;
+
+	/* Make sure the sequence number bits match the log file size */
+	l_size = le64_to_cpu(ra->l_size);
+
+	file_dat_bits = sizeof(u64) * 8 - le32_to_cpu(ra->seq_num_bits);
+	file_size_round = 1u << (file_dat_bits + 3);
+	if (file_size_round != l_size &&
+	    (file_size_round < l_size || (file_size_round / 2) > l_size)) {
+		return false;
+	}
+
+	/* The log page data offset and record header length must be quad-aligned */
+	if (!IsQuadAligned(le16_to_cpu(ra->data_off)) ||
+	    !IsQuadAligned(le16_to_cpu(ra->rec_hdr_len)))
+		return false;
+
+	return true;
+}
+
+static inline bool is_client_area_valid(const struct RESTART_HDR *rhdr,
+					bool usa_error)
+{
+	u16 ro = le16_to_cpu(rhdr->ra_off);
+	const struct RESTART_AREA *ra = Add2Ptr(rhdr, ro);
+	u16 ra_len = le16_to_cpu(ra->ra_len);
+	const struct CLIENT_REC *ca;
+	u32 i;
+
+	if (usa_error && ra_len + ro > SECTOR_SIZE - sizeof(short))
+		return false;
+
+	/* Find the start of the client array */
+	ca = Add2Ptr(ra, le16_to_cpu(ra->client_off));
+
+	/*
+	 * Start with the free list
+	 * Check that all the clients are valid and that there isn't a cycle
+	 * Do the in-use list on the second pass
+	 */
+	for (i = 0; i < 2; i++) {
+		u16 client_idx = le16_to_cpu(ra->client_idx[i]);
+		bool first_client = true;
+		u16 clients = le16_to_cpu(ra->log_clients);
+
+		while (client_idx != LFS_NO_CLIENT) {
+			const struct CLIENT_REC *cr;
+
+			if (!clients ||
+			    client_idx >= le16_to_cpu(ra->log_clients))
+				return false;
+
+			clients -= 1;
+			cr = ca + client_idx;
+
+			client_idx = le16_to_cpu(cr->next_client);
+
+			if (first_client) {
+				first_client = false;
+				if (cr->prev_client != LFS_NO_CLIENT_LE)
+					return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+/*
+ * remove_client
+ *
+ * remove a client record from a client record list an restart area
+ */
+static inline void remove_client(struct CLIENT_REC *ca,
+				 const struct CLIENT_REC *cr, __le16 *head)
+{
+	if (cr->prev_client == LFS_NO_CLIENT_LE)
+		*head = cr->next_client;
+	else
+		ca[le16_to_cpu(cr->prev_client)].next_client = cr->next_client;
+
+	if (cr->next_client != LFS_NO_CLIENT_LE)
+		ca[le16_to_cpu(cr->next_client)].prev_client = cr->prev_client;
+}
+
+/*
+ * add_client
+ *
+ * add a client record to the start of a list
+ */
+static inline void add_client(struct CLIENT_REC *ca, u16 index, __le16 *head)
+{
+	struct CLIENT_REC *cr = ca + index;
+
+	cr->prev_client = LFS_NO_CLIENT_LE;
+	cr->next_client = *head;
+
+	if (*head != LFS_NO_CLIENT_LE)
+		ca[le16_to_cpu(*head)].prev_client = cpu_to_le16(index);
+
+	*head = cpu_to_le16(index);
+}
+
+/*
+ * enum_rstbl
+ *
+ */
+static inline void *enum_rstbl(struct RESTART_TABLE *t, void *c)
+{
+	__le32 *e;
+	u32 bprt;
+	u16 rsize = t ? le16_to_cpu(t->size) : 0;
+
+	if (!c) {
+		if (!t || !t->total)
+			return NULL;
+		e = Add2Ptr(t, sizeof(struct RESTART_TABLE));
+	} else {
+		e = Add2Ptr(c, rsize);
+	}
+
+	/* Loop until we hit the first one allocated, or the end of the list */
+	for (bprt = bytes_per_rt(t); PtrOffset(t, e) < bprt;
+	     e = Add2Ptr(e, rsize)) {
+		if (*e == RESTART_ENTRY_ALLOCATED_LE)
+			return e;
+	}
+	return NULL;
+}
+
+/*
+ * find_dp
+ *
+ * searches for a 'vcn' in Dirty Page Table,
+ */
+static inline struct DIR_PAGE_ENTRY *find_dp(struct RESTART_TABLE *dptbl,
+					     u32 target_attr, u64 vcn)
+{
+	__le32 ta = cpu_to_le32(target_attr);
+	struct DIR_PAGE_ENTRY *dp = NULL;
+
+	while ((dp = enum_rstbl(dptbl, dp))) {
+		u64 dp_vcn = le64_to_cpu(dp->vcn);
+
+		if (dp->target_attr == ta && vcn >= dp_vcn &&
+		    vcn < dp_vcn + le32_to_cpu(dp->lcns_follow)) {
+			return dp;
+		}
+	}
+	return NULL;
+}
+
+static inline u32 norm_file_page(u32 page_size, u32 *l_size, bool use_default)
+{
+	if (use_default)
+		page_size = DefaultLogPageSize;
+
+	/* Round the file size down to a system page boundary */
+	*l_size &= ~(page_size - 1);
+
+	/* File should contain at least 2 restart pages and MinLogRecordPages pages */
+	if (*l_size < (MinLogRecordPages + 2) * page_size)
+		return 0;
+
+	return page_size;
+}
+
+static bool check_log_rec(const struct LOG_REC_HDR *lr, u32 bytes, u32 tr,
+			  u32 bytes_per_attr_entry)
+{
+	u16 t16;
+
+	if (bytes < sizeof(struct LOG_REC_HDR))
+		return false;
+	if (!tr)
+		return false;
+
+	if ((tr - sizeof(struct RESTART_TABLE)) %
+	    sizeof(struct TRANSACTION_ENTRY))
+		return false;
+
+	if (le16_to_cpu(lr->redo_off) & 7)
+		return false;
+
+	if (le16_to_cpu(lr->undo_off) & 7)
+		return false;
+
+	if (lr->target_attr)
+		goto check_lcns;
+
+	if (is_target_required(le16_to_cpu(lr->redo_op)))
+		return false;
+
+	if (is_target_required(le16_to_cpu(lr->undo_op)))
+		return false;
+
+check_lcns:
+	if (!lr->lcns_follow)
+		goto check_length;
+
+	t16 = le16_to_cpu(lr->target_attr);
+	if ((t16 - sizeof(struct RESTART_TABLE)) % bytes_per_attr_entry)
+		return false;
+
+check_length:
+	if (bytes < lrh_length(lr))
+		return false;
+
+	return true;
+}
+
+static bool check_rstbl(const struct RESTART_TABLE *rt, size_t bytes)
+{
+	u32 ts;
+	u32 i, off;
+	u16 rsize = le16_to_cpu(rt->size);
+	u16 ne = le16_to_cpu(rt->used);
+	u32 ff = le32_to_cpu(rt->first_free);
+	u32 lf = le32_to_cpu(rt->last_free);
+
+	ts = rsize * ne + sizeof(struct RESTART_TABLE);
+
+	if (!rsize || rsize > bytes ||
+	    rsize + sizeof(struct RESTART_TABLE) > bytes || bytes < ts ||
+	    le16_to_cpu(rt->total) > ne || ff > ts || lf > ts ||
+	    (ff && ff < sizeof(struct RESTART_TABLE)) ||
+	    (lf && lf < sizeof(struct RESTART_TABLE))) {
+		return false;
+	}
+
+	/* Verify each entry is either allocated or points
+	 * to a valid offset the table
+	 */
+	for (i = 0; i < ne; i++) {
+		off = le32_to_cpu(*(__le32 *)Add2Ptr(
+			rt, i * rsize + sizeof(struct RESTART_TABLE)));
+
+		if (off != RESTART_ENTRY_ALLOCATED && off &&
+		    (off < sizeof(struct RESTART_TABLE) ||
+		     ((off - sizeof(struct RESTART_TABLE)) % rsize))) {
+			return false;
+		}
+	}
+
+	/* Walk through the list headed by the first entry to make
+	 * sure none of the entries are currently being used
+	 */
+	for (off = ff; off;) {
+		if (off == RESTART_ENTRY_ALLOCATED)
+			return false;
+
+		off = le32_to_cpu(*(__le32 *)Add2Ptr(rt, off));
+	}
+
+	return true;
+}
+
+/*
+ * free_rsttbl_idx
+ *
+ * frees a previously allocated index a Restart Table.
+ */
+static inline void free_rsttbl_idx(struct RESTART_TABLE *rt, u32 off)
+{
+	__le32 *e;
+	u32 lf = le32_to_cpu(rt->last_free);
+	__le32 off_le = cpu_to_le32(off);
+
+	e = Add2Ptr(rt, off);
+
+	if (off < le32_to_cpu(rt->free_goal)) {
+		*e = rt->first_free;
+		rt->first_free = off_le;
+		if (!lf)
+			rt->last_free = off_le;
+	} else {
+		if (lf)
+			*(__le32 *)Add2Ptr(rt, lf) = off_le;
+		else
+			rt->first_free = off_le;
+
+		rt->last_free = off_le;
+		*e = 0;
+	}
+
+	le16_sub_cpu(&rt->total, 1);
+}
+
+static inline struct RESTART_TABLE *init_rsttbl(u16 esize, u16 used)
+{
+	__le32 *e, *last_free;
+	u32 off;
+	u32 bytes = esize * used + sizeof(struct RESTART_TABLE);
+	u32 lf = sizeof(struct RESTART_TABLE) + (used - 1) * esize;
+	struct RESTART_TABLE *t = ntfs_zalloc(bytes);
+
+	t->size = cpu_to_le16(esize);
+	t->used = cpu_to_le16(used);
+	t->free_goal = cpu_to_le32(~0u);
+	t->first_free = cpu_to_le32(sizeof(struct RESTART_TABLE));
+	t->last_free = cpu_to_le32(lf);
+
+	e = (__le32 *)(t + 1);
+	last_free = Add2Ptr(t, lf);
+
+	for (off = sizeof(struct RESTART_TABLE) + esize; e < last_free;
+	     e = Add2Ptr(e, esize), off += esize) {
+		*e = cpu_to_le32(off);
+	}
+	return t;
+}
+
+static inline struct RESTART_TABLE *extend_rsttbl(struct RESTART_TABLE *tbl,
+						  u32 add, u32 free_goal)
+{
+	u16 esize = le16_to_cpu(tbl->size);
+	__le32 osize = cpu_to_le32(bytes_per_rt(tbl));
+	u32 used = le16_to_cpu(tbl->used);
+	struct RESTART_TABLE *rt = init_rsttbl(esize, used + add);
+
+	memcpy(rt + 1, tbl + 1, esize * used);
+
+	rt->free_goal = free_goal == ~0u ?
+				cpu_to_le32(~0u) :
+				cpu_to_le32(sizeof(struct RESTART_TABLE) +
+					    free_goal * esize);
+
+	if (tbl->first_free) {
+		rt->first_free = tbl->first_free;
+		*(__le32 *)Add2Ptr(rt, le32_to_cpu(tbl->last_free)) = osize;
+	} else {
+		rt->first_free = osize;
+	}
+
+	rt->total = tbl->total;
+
+	ntfs_free(tbl);
+	return rt;
+}
+
+/*
+ * alloc_rsttbl_idx
+ *
+ * allocates an index from within a previously initialized Restart Table
+ */
+static inline void *alloc_rsttbl_idx(struct RESTART_TABLE **tbl)
+{
+	u32 off;
+	__le32 *e;
+	struct RESTART_TABLE *t = *tbl;
+
+	if (!t->first_free)
+		*tbl = t = extend_rsttbl(t, 16, ~0u);
+
+	off = le32_to_cpu(t->first_free);
+
+	/* Dequeue this entry and zero it. */
+	e = Add2Ptr(t, off);
+
+	t->first_free = *e;
+
+	memset(e, 0, le16_to_cpu(t->size));
+
+	*e = RESTART_ENTRY_ALLOCATED_LE;
+
+	/* If list is going empty, then we fix the last_free as well. */
+	if (!t->first_free)
+		t->last_free = 0;
+
+	le16_add_cpu(&t->total, 1);
+
+	return Add2Ptr(t, off);
+}
+
+/*
+ * alloc_rsttbl_from_idx
+ *
+ * allocates a specific index from within a previously initialized Restart Table
+ */
+static inline void *alloc_rsttbl_from_idx(struct RESTART_TABLE **tbl, u32 vbo)
+{
+	u32 off;
+	__le32 *e;
+	struct RESTART_TABLE *rt = *tbl;
+	u32 bytes = bytes_per_rt(rt);
+	u16 esize = le16_to_cpu(rt->size);
+
+	/* If the entry is not the table, we will have to extend the table */
+	if (vbo >= bytes) {
+		/*
+		 * extend the size by computing the number of entries between
+		 * the existing size and the desired index and adding
+		 * 1 to that
+		 */
+		u32 bytes2idx = vbo - bytes;
+
+		/* There should always be an integral number of entries being added */
+		/* Now extend the table */
+		*tbl = rt = extend_rsttbl(rt, bytes2idx / esize + 1, bytes);
+		if (!rt)
+			return NULL;
+	}
+
+	/* see if the entry is already allocated, and just return if it is. */
+	e = Add2Ptr(rt, vbo);
+
+	if (*e == RESTART_ENTRY_ALLOCATED_LE)
+		return e;
+
+	/*
+	 * Walk through the table, looking for the entry we're
+	 * interested and the previous entry
+	 */
+	off = le32_to_cpu(rt->first_free);
+	e = Add2Ptr(rt, off);
+
+	if (off == vbo) {
+		/* this is a match */
+		rt->first_free = *e;
+		goto skip_looking;
+	}
+
+	/*
+	 * need to walk through the list looking for the predecessor of our entry
+	 */
+	for (;;) {
+		/* Remember the entry just found */
+		u32 last_off = off;
+		__le32 *last_e = e;
+
+		/* should never run of entries. */
+
+		/* Lookup up the next entry the list */
+		off = le32_to_cpu(*last_e);
+		e = Add2Ptr(rt, off);
+
+		/* If this is our match we are done */
+		if (off == vbo) {
+			*last_e = *e;
+
+			/* If this was the last entry, we update that the table as well */
+			if (le32_to_cpu(rt->last_free) == off)
+				rt->last_free = cpu_to_le32(last_off);
+			break;
+		}
+	}
+
+skip_looking:
+	/* If the list is now empty, we fix the last_free as well */
+	if (!rt->first_free)
+		rt->last_free = 0;
+
+	/* Zero this entry */
+	memset(e, 0, esize);
+	*e = RESTART_ENTRY_ALLOCATED_LE;
+
+	le16_add_cpu(&rt->total, 1);
+
+	return e;
+}
+
+#define RESTART_SINGLE_PAGE_IO cpu_to_le16(0x0001)
+
+#define NTFSLOG_WRAPPED 0x00000001
+#define NTFSLOG_MULTIPLE_PAGE_IO 0x00000002
+#define NTFSLOG_NO_LAST_LSN 0x00000004
+#define NTFSLOG_REUSE_TAIL 0x00000010
+#define NTFSLOG_NO_OLDEST_LSN 0x00000020
+
+/*
+ * Helper struct to work with NTFS $LogFile
+ */
+struct ntfs_log {
+	struct ntfs_inode *ni;
+
+	u32 l_size;
+	u32 sys_page_size;
+	u32 sys_page_mask;
+	u32 page_size;
+	u32 page_mask; // page_size - 1
+	u8 page_bits;
+	struct RECORD_PAGE_HDR *one_page_buf;
+
+	struct RESTART_TABLE *open_attr_tbl;
+	u32 transaction_id;
+	u32 clst_per_page;
+
+	u32 first_page;
+	u32 next_page;
+	u32 ra_off;
+	u32 data_off;
+	u32 restart_size;
+	u32 data_size;
+	u16 record_header_len;
+	u64 seq_num;
+	u32 seq_num_bits;
+	u32 file_data_bits;
+	u32 seq_num_mask; /* (1 << file_data_bits) - 1 */
+
+	struct RESTART_AREA *ra; /* in-memory image of the next restart area */
+	u32 ra_size; /* the usable size of the restart area */
+
+	/*
+	 * If true, then the in-memory restart area is to be written
+	 * to the first position on the disk
+	 */
+	bool init_ra;
+	bool set_dirty; /* true if we need to set dirty flag */
+
+	u64 oldest_lsn;
+
+	u32 oldest_lsn_off;
+	u64 last_lsn;
+
+	u32 total_avail;
+	u32 total_avail_pages;
+	u32 total_undo_commit;
+	u32 max_current_avail;
+	u32 current_avail;
+	u32 reserved;
+
+	short major_ver;
+	short minor_ver;
+
+	u32 l_flags; /* See NTFSLOG_XXX */
+	u32 current_openlog_count; /* On-disk value for open_log_count */
+
+	struct CLIENT_ID client_id;
+	u32 client_undo_commit;
+};
+
+static inline u32 lsn_to_vbo(struct ntfs_log *log, const u64 lsn)
+{
+	u32 vbo = (lsn << log->seq_num_bits) >> (log->seq_num_bits - 3);
+
+	return vbo;
+}
+
+/* compute the offset in the log file of the next log page */
+static inline u32 next_page_off(struct ntfs_log *log, u32 off)
+{
+	off = (off & ~log->sys_page_mask) + log->page_size;
+	return off >= log->l_size ? log->first_page : off;
+}
+
+static inline u32 lsn_to_page_off(struct ntfs_log *log, u64 lsn)
+{
+	return (((u32)lsn) << 3) & log->page_mask;
+}
+
+static inline u64 vbo_to_lsn(struct ntfs_log *log, u32 off, u64 Seq)
+{
+	return (off >> 3) + (Seq << log->file_data_bits);
+}
+
+static inline bool is_lsn_in_file(struct ntfs_log *log, u64 lsn)
+{
+	return lsn >= log->oldest_lsn &&
+	       lsn <= le64_to_cpu(log->ra->current_lsn);
+}
+
+static inline u32 hdr_file_off(struct ntfs_log *log,
+			       struct RECORD_PAGE_HDR *hdr)
+{
+	if (log->major_ver < 2)
+		return le64_to_cpu(hdr->rhdr.lsn);
+
+	return le32_to_cpu(hdr->file_off);
+}
+
+static inline u64 base_lsn(struct ntfs_log *log,
+			   const struct RECORD_PAGE_HDR *hdr, u64 lsn)
+{
+	u64 h_lsn = le64_to_cpu(hdr->rhdr.lsn);
+	u64 ret = (((h_lsn >> log->file_data_bits) +
+		    (lsn < (lsn_to_vbo(log, h_lsn) & ~log->page_mask) ? 1 : 0))
+		   << log->file_data_bits) +
+		  ((((is_log_record_end(hdr) &&
+		      h_lsn <= le64_to_cpu(hdr->record_hdr.last_end_lsn)) ?
+			     le16_to_cpu(hdr->record_hdr.next_record_off) :
+			     log->page_size) +
+		    lsn) >>
+		   3);
+
+	return ret;
+}
+
+static inline bool verify_client_lsn(struct ntfs_log *log,
+				     const struct CLIENT_REC *client, u64 lsn)
+{
+	return lsn >= le64_to_cpu(client->oldest_lsn) &&
+	       lsn <= le64_to_cpu(log->ra->current_lsn) && lsn;
+}
+
+struct restart_info {
+	u64 last_lsn;
+	struct RESTART_HDR *r_page;
+	u32 vbo;
+	bool chkdsk_was_run;
+	bool valid_page;
+	bool initialized;
+	bool restart;
+};
+
+static int read_log_page(struct ntfs_log *log, u32 vbo,
+			 struct RECORD_PAGE_HDR **buffer, bool *usa_error)
+{
+	int err = 0;
+	u32 page_idx = vbo >> log->page_bits;
+	u32 page_off = vbo & log->page_mask;
+	u32 bytes = log->page_size - page_off;
+	void *to_free = NULL;
+	u32 page_vbo = page_idx << log->page_bits;
+	struct RECORD_PAGE_HDR *page_buf;
+	struct ntfs_inode *ni = log->ni;
+	bool bBAAD;
+
+	if (vbo >= log->l_size)
+		return -EINVAL;
+
+	if (!*buffer) {
+		to_free = ntfs_malloc(bytes);
+		if (!to_free)
+			return -ENOMEM;
+		*buffer = to_free;
+	}
+
+	page_buf = page_off ? log->one_page_buf : *buffer;
+
+	err = ntfs_read_run_nb(ni->mi.sbi, &ni->file.run, page_vbo, page_buf,
+			       log->page_size, NULL);
+	if (err)
+		goto out;
+
+	if (page_buf->rhdr.sign != NTFS_FFFF_SIGNATURE)
+		ntfs_fix_post_read(&page_buf->rhdr, PAGE_SIZE, false);
+
+	if (page_buf != *buffer)
+		memcpy(*buffer, Add2Ptr(page_buf, page_off), bytes);
+
+	bBAAD = page_buf->rhdr.sign == NTFS_BAAD_SIGNATURE;
+
+	if (usa_error)
+		*usa_error = bBAAD;
+	/* Check that the update sequence array for this page is valid */
+	/* If we don't allow errors, raise an error status */
+	else if (bBAAD)
+		err = -EINVAL;
+
+out:
+	if (err && to_free) {
+		ntfs_free(to_free);
+		*buffer = NULL;
+	}
+
+	return err;
+}
+
+/*
+ * log_read_rst
+ *
+ * it walks through 512 blocks of the file looking for a valid restart page header
+ * It will stop the first time we find a valid page header
+ */
+static int log_read_rst(struct ntfs_log *log, u32 l_size, bool first,
+			struct restart_info *info)
+{
+	u32 skip, vbo;
+	struct RESTART_HDR *r_page = ntfs_malloc(DefaultLogPageSize);
+
+	if (!r_page)
+		return -ENOMEM;
+
+	memset(info, 0, sizeof(struct restart_info));
+
+	/* Determine which restart area we are looking for */
+	if (first) {
+		vbo = 0;
+		skip = 512;
+	} else {
+		vbo = 512;
+		skip = 0;
+	}
+
+	/* loop continuously until we succeed */
+	for (; vbo < l_size; vbo = 2 * vbo + skip, skip = 0) {
+		bool usa_error;
+		u32 sys_page_size;
+		bool brst, bchk;
+		struct RESTART_AREA *ra;
+
+		/* Read a page header at the current offset */
+		if (read_log_page(log, vbo, (struct RECORD_PAGE_HDR **)&r_page,
+				  &usa_error)) {
+			/* ignore any errors */
+			continue;
+		}
+
+		/* exit if the signature is a log record page */
+		if (r_page->rhdr.sign == NTFS_RCRD_SIGNATURE) {
+			info->initialized = true;
+			break;
+		}
+
+		brst = r_page->rhdr.sign == NTFS_RSTR_SIGNATURE;
+		bchk = r_page->rhdr.sign == NTFS_CHKD_SIGNATURE;
+
+		if (!bchk && !brst) {
+			if (r_page->rhdr.sign != NTFS_FFFF_SIGNATURE) {
+				/*
+				 * Remember if the signature does not
+				 * indicate uninitialized file
+				 */
+				info->initialized = true;
+			}
+			continue;
+		}
+
+		ra = NULL;
+		info->valid_page = false;
+		info->initialized = true;
+		info->vbo = vbo;
+
+		/* Let's check the restart area if this is a valid page */
+		if (!is_rst_page_hdr_valid(vbo, r_page))
+			goto check_result;
+		ra = Add2Ptr(r_page, le16_to_cpu(r_page->ra_off));
+
+		if (!is_rst_area_valid(r_page))
+			goto check_result;
+
+		/*
+		 * We have a valid restart page header and restart area.
+		 * If chkdsk was run or we have no clients then we have
+		 * no more checking to do
+		 */
+		if (bchk || ra->client_idx[1] == LFS_NO_CLIENT_LE) {
+			info->valid_page = true;
+			goto check_result;
+		}
+
+		/* Read the entire restart area */
+		sys_page_size = le32_to_cpu(r_page->sys_page_size);
+		if (DefaultLogPageSize != sys_page_size) {
+			ntfs_free(r_page);
+			r_page = ntfs_zalloc(sys_page_size);
+			if (!r_page)
+				return -ENOMEM;
+
+			if (read_log_page(log, vbo,
+					  (struct RECORD_PAGE_HDR **)&r_page,
+					  &usa_error)) {
+				/* ignore any errors */
+				ntfs_free(r_page);
+				r_page = NULL;
+				continue;
+			}
+		}
+
+		if (is_client_area_valid(r_page, usa_error)) {
+			info->valid_page = true;
+			ra = Add2Ptr(r_page, le16_to_cpu(r_page->ra_off));
+		}
+
+check_result:
+		/* If chkdsk was run then update the caller's values and return */
+		if (r_page->rhdr.sign == NTFS_CHKD_SIGNATURE) {
+			info->chkdsk_was_run = true;
+			info->last_lsn = le64_to_cpu(r_page->rhdr.lsn);
+			info->restart = true;
+			info->r_page = r_page;
+			return 0;
+		}
+
+		/* If we have a valid page then copy the values we need from it */
+		if (info->valid_page) {
+			info->last_lsn = le64_to_cpu(ra->current_lsn);
+			info->restart = true;
+			info->r_page = r_page;
+			return 0;
+		}
+	}
+
+	ntfs_free(r_page);
+
+	return 0;
+}
+
+/*
+ * log_init_pg_hdr
+ *
+ * init "log' from restart page header
+ */
+static void log_init_pg_hdr(struct ntfs_log *log, u32 sys_page_size,
+			    u32 page_size, u16 major_ver, u16 minor_ver)
+{
+	log->sys_page_size = sys_page_size;
+	log->sys_page_mask = sys_page_size - 1;
+	log->page_size = page_size;
+	log->page_mask = page_size - 1;
+	log->page_bits = blksize_bits(page_size);
+
+	log->clst_per_page = log->page_size >> log->ni->mi.sbi->cluster_bits;
+	if (!log->clst_per_page)
+		log->clst_per_page = 1;
+
+	log->first_page = major_ver >= 2 ?
+				  0x22 * page_size :
+				  ((sys_page_size << 1) + (page_size << 1));
+	log->major_ver = major_ver;
+	log->minor_ver = minor_ver;
+}
+
+/*
+ * log_create
+ *
+ * init "log" in cases when we don't have a restart area to use
+ */
+static void log_create(struct ntfs_log *log, u32 l_size, const u64 last_lsn,
+		       u32 open_log_count, bool wrapped, bool use_multi_page)
+{
+	log->l_size = l_size;
+	/* All file offsets must be quadword aligned */
+	log->file_data_bits = blksize_bits(l_size) - 3;
+	log->seq_num_mask = (8 << log->file_data_bits) - 1;
+	log->seq_num_bits = sizeof(u64) * 8 - log->file_data_bits;
+	log->seq_num = (last_lsn >> log->file_data_bits) + 2;
+	log->next_page = log->first_page;
+	log->oldest_lsn = log->seq_num << log->file_data_bits;
+	log->oldest_lsn_off = 0;
+	log->last_lsn = log->oldest_lsn;
+
+	log->l_flags |= NTFSLOG_NO_LAST_LSN | NTFSLOG_NO_OLDEST_LSN;
+
+	/* Set the correct flags for the I/O and indicate if we have wrapped */
+	if (wrapped)
+		log->l_flags |= NTFSLOG_WRAPPED;
+
+	if (use_multi_page)
+		log->l_flags |= NTFSLOG_MULTIPLE_PAGE_IO;
+
+	/* Compute the log page values */
+	log->data_off = QuadAlign(
+		offsetof(struct RECORD_PAGE_HDR, fixups) +
+		sizeof(short) * ((log->page_size >> SECTOR_SHIFT) + 1));
+	log->data_size = log->page_size - log->data_off;
+	log->record_header_len = sizeof(struct LFS_RECORD_HDR);
+
+	/* Remember the different page sizes for reservation */
+	log->reserved = log->data_size - log->record_header_len;
+
+	/* Compute the restart page values. */
+	log->ra_off = QuadAlign(
+		offsetof(struct RESTART_HDR, fixups) +
+		sizeof(short) * ((log->sys_page_size >> SECTOR_SHIFT) + 1));
+	log->restart_size = log->sys_page_size - log->ra_off;
+	log->ra_size = offsetof(struct RESTART_AREA, clients) +
+		       sizeof(struct CLIENT_REC);
+	log->current_openlog_count = open_log_count;
+
+	/*
+	 * The total available log file space is the number of
+	 * log file pages times the space available on each page
+	 */
+	log->total_avail_pages = log->l_size - log->first_page;
+	log->total_avail = log->total_avail_pages >> log->page_bits;
+
+	/*
+	 * We assume that we can't use the end of the page less than
+	 * the file record size
+	 * Then we won't need to reserve more than the caller asks for
+	 */
+	log->max_current_avail = log->total_avail * log->reserved;
+	log->total_avail = log->total_avail * log->data_size;
+	log->current_avail = log->max_current_avail;
+}
+
+/*
+ * log_create_ra
+ *
+ * This routine is called to fill a restart area from the values stored in 'log'
+ */
+static struct RESTART_AREA *log_create_ra(struct ntfs_log *log)
+{
+	struct CLIENT_REC *cr;
+	struct RESTART_AREA *ra = ntfs_zalloc(log->restart_size);
+
+	if (!ra)
+		return NULL;
+
+	ra->current_lsn = cpu_to_le64(log->last_lsn);
+	ra->log_clients = cpu_to_le16(1);
+	ra->client_idx[1] = LFS_NO_CLIENT_LE;
+	if (log->l_flags & NTFSLOG_MULTIPLE_PAGE_IO)
+		ra->flags = RESTART_SINGLE_PAGE_IO;
+	ra->seq_num_bits = cpu_to_le32(log->seq_num_bits);
+	ra->ra_len = cpu_to_le16(log->ra_size);
+	ra->client_off = cpu_to_le16(offsetof(struct RESTART_AREA, clients));
+	ra->l_size = cpu_to_le64(log->l_size);
+	ra->rec_hdr_len = cpu_to_le16(log->record_header_len);
+	ra->data_off = cpu_to_le16(log->data_off);
+	ra->open_log_count = cpu_to_le32(log->current_openlog_count + 1);
+
+	cr = ra->clients;
+
+	cr->prev_client = LFS_NO_CLIENT_LE;
+	cr->next_client = LFS_NO_CLIENT_LE;
+
+	return ra;
+}
+
+static u32 final_log_off(struct ntfs_log *log, u64 lsn, u32 data_len)
+{
+	u32 base_vbo = lsn << 3;
+	u32 final_log_off = (base_vbo & log->seq_num_mask) & ~log->page_mask;
+	u32 page_off = base_vbo & log->page_mask;
+	u32 tail = log->page_size - page_off;
+
+	page_off -= 1;
+
+	/* Add the length of the header */
+	data_len += log->record_header_len;
+
+	/*
+	 * If this lsn is contained this log page we are done
+	 * Otherwise we need to walk through several log pages
+	 */
+	if (data_len > tail) {
+		data_len -= tail;
+		tail = log->data_size;
+		page_off = log->data_off - 1;
+
+		for (;;) {
+			final_log_off = next_page_off(log, final_log_off);
+
+			/* We are done if the remaining bytes fit on this page */
+			if (data_len <= tail)
+				break;
+			data_len -= tail;
+		}
+	}
+
+	/*
+	 * We add the remaining bytes to our starting position on this page
+	 * and then add that value to the file offset of this log page
+	 */
+	return final_log_off + data_len + page_off;
+}
+
+static int next_log_lsn(struct ntfs_log *log, const struct LFS_RECORD_HDR *rh,
+			u64 *lsn)
+{
+	int err;
+	u64 this_lsn = le64_to_cpu(rh->this_lsn);
+	u32 vbo = lsn_to_vbo(log, this_lsn);
+	u32 end =
+		final_log_off(log, this_lsn, le32_to_cpu(rh->client_data_len));
+	u32 hdr_off = end & ~log->sys_page_mask;
+	u64 seq = this_lsn >> log->file_data_bits;
+	struct RECORD_PAGE_HDR *page = NULL;
+
+	/* Remember if we wrapped */
+	if (end <= vbo)
+		seq += 1;
+
+	/* log page header for this page */
+	err = read_log_page(log, hdr_off, &page, NULL);
+	if (err)
+		return err;
+
+	/*
+	 * If the lsn we were given was not the last lsn on this page,
+	 * then the starting offset for the next lsn is on a quad word
+	 * boundary following the last file offset for the current lsn
+	 * Otherwise the file offset is the start of the data on the next page
+	 */
+	if (this_lsn == le64_to_cpu(page->rhdr.lsn)) {
+		/* If we wrapped, we need to increment the sequence number */
+		hdr_off = next_page_off(log, hdr_off);
+		if (hdr_off == log->first_page)
+			seq += 1;
+
+		vbo = hdr_off + log->data_off;
+	} else {
+		vbo = QuadAlign(end);
+	}
+
+	/* Compute the lsn based on the file offset and the sequence count */
+	*lsn = vbo_to_lsn(log, vbo, seq);
+
+	/*
+	 * If this lsn is within the legal range for the file, we return true
+	 * Otherwise false indicates that there are no more lsn's
+	 */
+	if (!is_lsn_in_file(log, *lsn))
+		*lsn = 0;
+
+	ntfs_free(page);
+
+	return 0;
+}
+
+/*
+ * current_log_avail
+ *
+ * calculate the number of bytes available for log records
+ */
+static u32 current_log_avail(struct ntfs_log *log)
+{
+	u32 oldest_off, next_free_off, free_bytes;
+
+	if (log->l_flags & NTFSLOG_NO_LAST_LSN) {
+		/* The entire file is available */
+		return log->max_current_avail;
+	}
+
+	/*
+	 * If there is a last lsn the restart area then we know that we will
+	 * have to compute the free range
+	 * If there is no oldest lsn then start at the first page of the file
+	 */
+	oldest_off = (log->l_flags & NTFSLOG_NO_OLDEST_LSN) ?
+			     log->first_page :
+			     (log->oldest_lsn_off & ~log->sys_page_mask);
+
+	/*
+	 * We will use the next log page offset to compute the next free page\
+	 * If we are going to reuse this page go to the next page
+	 * If we are at the first page then use the end of the file
+	 */
+	next_free_off = (log->l_flags & NTFSLOG_REUSE_TAIL) ?
+				log->next_page + log->page_size :
+				log->next_page == log->first_page ?
+				log->l_size :
+				log->next_page;
+
+	/* If the two offsets are the same then there is no available space */
+	if (oldest_off == next_free_off)
+		return 0;
+	/*
+	 * If the free offset follows the oldest offset then subtract
+	 * this range from the total available pages
+	 */
+	free_bytes =
+		oldest_off < next_free_off ?
+			log->total_avail_pages - (next_free_off - oldest_off) :
+			oldest_off - next_free_off;
+
+	free_bytes >>= log->page_bits;
+	return free_bytes * log->reserved;
+}
+
+static bool check_subseq_log_page(struct ntfs_log *log,
+				  const struct RECORD_PAGE_HDR *rp, u32 vbo,
+				  u64 seq)
+{
+	u64 lsn_seq;
+	const struct NTFS_RECORD_HEADER *rhdr = &rp->rhdr;
+	u64 lsn = le64_to_cpu(rhdr->lsn);
+
+	if (rhdr->sign == NTFS_FFFF_SIGNATURE || !rhdr->sign)
+		return false;
+
+	/*
+	 * If the last lsn on the page occurs was written after the page
+	 * that caused the original error then we have a fatal error
+	 */
+	lsn_seq = lsn >> log->file_data_bits;
+
+	/*
+	 * If the sequence number for the lsn the page is equal or greater
+	 * than lsn we expect, then this is a subsequent write
+	 */
+	return lsn_seq >= seq ||
+	       (lsn_seq == seq - 1 && log->first_page == vbo &&
+		vbo != (lsn_to_vbo(log, lsn) & ~log->page_mask));
+}
+
+/*
+ * last_log_lsn
+ *
+ * This routine walks through the log pages for a file, searching for the
+ * last log page written to the file
+ */
+static int last_log_lsn(struct ntfs_log *log)
+{
+	int err;
+	bool usa_error = false;
+	bool replace_page = false;
+	bool reuse_page = log->l_flags & NTFSLOG_REUSE_TAIL;
+	bool wrapped_file, wrapped;
+
+	u32 page_cnt = 1, page_pos = 1;
+	u32 page_off = 0, page_off1 = 0, saved_off = 0;
+	u32 final_off, second_off, final_off_prev = 0, second_off_prev = 0;
+	u32 first_file_off = 0, second_file_off = 0;
+	u32 part_io_count = 0;
+	u32 tails = 0;
+	u32 this_off, curpage_off, nextpage_off, remain_pages;
+
+	u64 expected_seq, seq_base = 0, lsn_base = 0;
+	u64 best_lsn, best_lsn1, best_lsn2;
+	u64 lsn_cur, lsn1, lsn2;
+	u64 last_ok_lsn = reuse_page ? log->last_lsn : 0;
+
+	u16 cur_pos, best_page_pos;
+
+	struct RECORD_PAGE_HDR *page = NULL;
+	struct RECORD_PAGE_HDR *tst_page = NULL;
+	struct RECORD_PAGE_HDR *first_tail = NULL;
+	struct RECORD_PAGE_HDR *second_tail = NULL;
+	struct RECORD_PAGE_HDR *tail_page = NULL;
+	struct RECORD_PAGE_HDR *second_tail_prev = NULL;
+	struct RECORD_PAGE_HDR *first_tail_prev = NULL;
+	struct RECORD_PAGE_HDR *page_bufs = NULL;
+	struct RECORD_PAGE_HDR *best_page;
+
+	if (log->major_ver >= 2) {
+		final_off = 0x02 * log->page_size;
+		second_off = 0x12 * log->page_size;
+
+		// 0x10 == 0x12 - 0x2
+		page_bufs = ntfs_malloc(log->page_size * 0x10);
+		if (!page_bufs)
+			return -ENOMEM;
+	} else {
+		second_off = log->first_page - log->page_size;
+		final_off = second_off - log->page_size;
+	}
+
+next_tail:
+	/* Read second tail page (at pos 3/0x12000) */
+	if (read_log_page(log, second_off, &second_tail, &usa_error) ||
+	    usa_error || second_tail->rhdr.sign != NTFS_RCRD_SIGNATURE) {
+		ntfs_free(second_tail);
+		second_tail = NULL;
+		second_file_off = 0;
+		lsn2 = 0;
+	} else {
+		second_file_off = hdr_file_off(log, second_tail);
+		lsn2 = le64_to_cpu(second_tail->record_hdr.last_end_lsn);
+	}
+
+	/* Read first tail page (at pos 2/0x2000 ) */
+	if (read_log_page(log, final_off, &first_tail, &usa_error) ||
+	    usa_error || first_tail->rhdr.sign != NTFS_RCRD_SIGNATURE) {
+		ntfs_free(first_tail);
+		first_tail = NULL;
+		first_file_off = 0;
+		lsn1 = 0;
+	} else {
+		first_file_off = hdr_file_off(log, first_tail);
+		lsn1 = le64_to_cpu(first_tail->record_hdr.last_end_lsn);
+	}
+
+	if (log->major_ver < 2) {
+		int best_page;
+
+		first_tail_prev = first_tail;
+		final_off_prev = first_file_off;
+		second_tail_prev = second_tail;
+		second_off_prev = second_file_off;
+		tails = 1;
+
+		if (!first_tail && !second_tail)
+			goto tail_read;
+
+		if (first_tail && second_tail)
+			best_page = lsn1 < lsn2 ? 1 : 0;
+		else if (first_tail)
+			best_page = 0;
+		else
+			best_page = 1;
+
+		page_off = best_page ? second_file_off : first_file_off;
+		seq_base = (best_page ? lsn2 : lsn1) >> log->file_data_bits;
+		goto tail_read;
+	}
+
+	best_lsn1 = first_tail ? base_lsn(log, first_tail, first_file_off) : 0;
+	best_lsn2 =
+		second_tail ? base_lsn(log, second_tail, second_file_off) : 0;
+
+	if (first_tail && second_tail) {
+		if (best_lsn1 > best_lsn2) {
+			best_lsn = best_lsn1;
+			best_page = first_tail;
+			this_off = first_file_off;
+		} else {
+			best_lsn = best_lsn2;
+			best_page = second_tail;
+			this_off = second_file_off;
+		}
+	} else if (first_tail) {
+		best_lsn = best_lsn1;
+		best_page = first_tail;
+		this_off = first_file_off;
+	} else if (second_tail) {
+		best_lsn = best_lsn2;
+		best_page = second_tail;
+		this_off = second_file_off;
+	} else {
+		goto tail_read;
+	}
+
+	best_page_pos = le16_to_cpu(best_page->page_pos);
+
+	if (!tails) {
+		if (best_page_pos == page_pos) {
+			seq_base = best_lsn >> log->file_data_bits;
+			saved_off = page_off = le32_to_cpu(best_page->file_off);
+			lsn_base = best_lsn;
+
+			memmove(page_bufs, best_page, log->page_size);
+
+			page_cnt = le16_to_cpu(best_page->page_count);
+			if (page_cnt > 1)
+				page_pos += 1;
+
+			tails = 1;
+		}
+	} else if (seq_base == (best_lsn >> log->file_data_bits) &&
+		   saved_off + log->page_size == this_off &&
+		   lsn_base < best_lsn &&
+		   (page_pos != page_cnt || best_page_pos == page_pos ||
+		    best_page_pos == 1) &&
+		   (page_pos >= page_cnt || best_page_pos == page_pos)) {
+		u16 bppc = le16_to_cpu(best_page->page_count);
+
+		saved_off += log->page_size;
+		lsn_base = best_lsn;
+
+		memmove(Add2Ptr(page_bufs, tails * log->page_size), best_page,
+			log->page_size);
+
+		tails += 1;
+
+		if (best_page_pos != bppc) {
+			page_cnt = bppc;
+			page_pos = best_page_pos;
+
+			if (page_cnt > 1)
+				page_pos += 1;
+		} else {
+			page_pos = page_cnt = 1;
+		}
+	} else {
+		ntfs_free(first_tail);
+		ntfs_free(second_tail);
+		goto tail_read;
+	}
+
+	ntfs_free(first_tail_prev);
+	first_tail_prev = first_tail;
+	final_off_prev = first_file_off;
+	first_tail = NULL;
+
+	ntfs_free(second_tail_prev);
+	second_tail_prev = second_tail;
+	second_off_prev = second_file_off;
+	second_tail = NULL;
+
+	final_off += log->page_size;
+	second_off += log->page_size;
+
+	if (tails < 0x10)
+		goto next_tail;
+tail_read:
+	first_tail = first_tail_prev;
+	final_off = final_off_prev;
+
+	second_tail = second_tail_prev;
+	second_off = second_off_prev;
+
+	page_cnt = page_pos = 1;
+
+	curpage_off = seq_base == log->seq_num ? min(log->next_page, page_off) :
+						 log->next_page;
+
+	wrapped_file =
+		curpage_off == log->first_page &&
+		!(log->l_flags & (NTFSLOG_NO_LAST_LSN | NTFSLOG_REUSE_TAIL));
+
+	expected_seq = wrapped_file ? (log->seq_num + 1) : log->seq_num;
+
+	nextpage_off = curpage_off;
+
+next_page:
+	tail_page = NULL;
+	/* Read the next log page */
+	err = read_log_page(log, curpage_off, &page, &usa_error);
+
+	/* Compute the next log page offset the file */
+	nextpage_off = next_page_off(log, curpage_off);
+	wrapped = nextpage_off == log->first_page;
+
+	if (tails > 1) {
+		struct RECORD_PAGE_HDR *cur_page =
+			Add2Ptr(page_bufs, curpage_off - page_off);
+
+		if (curpage_off == saved_off) {
+			tail_page = cur_page;
+			goto use_tail_page;
+		}
+
+		if (page_off > curpage_off || curpage_off >= saved_off)
+			goto use_tail_page;
+
+		if (page_off1)
+			goto use_cur_page;
+
+		if (!err && !usa_error &&
+		    page->rhdr.sign == NTFS_RCRD_SIGNATURE &&
+		    cur_page->rhdr.lsn == page->rhdr.lsn &&
+		    cur_page->record_hdr.next_record_off ==
+			    page->record_hdr.next_record_off &&
+		    ((page_pos == page_cnt &&
+		      le16_to_cpu(page->page_pos) == 1) ||
+		     (page_pos != page_cnt &&
+		      le16_to_cpu(page->page_pos) == page_pos + 1 &&
+		      le16_to_cpu(page->page_count) == page_cnt))) {
+			cur_page = NULL;
+			goto use_tail_page;
+		}
+
+		page_off1 = page_off;
+
+use_cur_page:
+
+		lsn_cur = le64_to_cpu(cur_page->rhdr.lsn);
+
+		if (last_ok_lsn !=
+			    le64_to_cpu(cur_page->record_hdr.last_end_lsn) &&
+		    ((lsn_cur >> log->file_data_bits) +
+		     ((curpage_off <
+		       (lsn_to_vbo(log, lsn_cur) & ~log->page_mask)) ?
+			      1 :
+			      0)) != expected_seq) {
+			goto check_tail;
+		}
+
+		if (!is_log_record_end(cur_page)) {
+			tail_page = NULL;
+			last_ok_lsn = lsn_cur;
+			goto next_page_1;
+		}
+
+		log->seq_num = expected_seq;
+		log->l_flags &= ~NTFSLOG_NO_LAST_LSN;
+		log->last_lsn = le64_to_cpu(cur_page->record_hdr.last_end_lsn);
+		log->ra->current_lsn = cur_page->record_hdr.last_end_lsn;
+
+		if (log->record_header_len <=
+		    log->page_size -
+			    le16_to_cpu(cur_page->record_hdr.next_record_off)) {
+			log->l_flags |= NTFSLOG_REUSE_TAIL;
+			log->next_page = curpage_off;
+		} else {
+			log->l_flags &= ~NTFSLOG_REUSE_TAIL;
+			log->next_page = nextpage_off;
+		}
+
+		if (wrapped_file)
+			log->l_flags |= NTFSLOG_WRAPPED;
+
+		last_ok_lsn = le64_to_cpu(cur_page->record_hdr.last_end_lsn);
+		goto next_page_1;
+	}
+
+	/*
+	 * If we are at the expected first page of a transfer check to see
+	 * if either tail copy is at this offset
+	 * If this page is the last page of a transfer, check if we wrote
+	 * a subsequent tail copy
+	 */
+	if (page_cnt == page_pos || page_cnt == page_pos + 1) {
+		/*
+		 * Check if the offset matches either the first or second
+		 * tail copy. It is possible it will match both
+		 */
+		if (curpage_off == final_off)
+			tail_page = first_tail;
+
+		/*
+		 * If we already matched on the first page then
+		 * check the ending lsn's.
+		 */
+		if (curpage_off == second_off) {
+			if (!tail_page ||
+			    (second_tail &&
+			     le64_to_cpu(second_tail->record_hdr.last_end_lsn) >
+				     le64_to_cpu(first_tail->record_hdr
+							 .last_end_lsn))) {
+				tail_page = second_tail;
+			}
+		}
+	}
+
+use_tail_page:
+	if (tail_page) {
+		/* we have a candidate for a tail copy */
+		lsn_cur = le64_to_cpu(tail_page->record_hdr.last_end_lsn);
+
+		if (last_ok_lsn < lsn_cur) {
+			/*
+			 * If the sequence number is not expected,
+			 * then don't use the tail copy
+			 */
+			if (expected_seq != (lsn_cur >> log->file_data_bits))
+				tail_page = NULL;
+		} else if (last_ok_lsn > lsn_cur) {
+			/*
+			 * If the last lsn is greater than the one on
+			 * this page then forget this tail
+			 */
+			tail_page = NULL;
+		}
+	}
+
+	/* If we have an error on the current page, we will break of this loop */
+	if (err || usa_error)
+		goto check_tail;
+
+	/*
+	 * Done if the last lsn on this page doesn't match the previous known
+	 * last lsn or the sequence number is not expected
+	 */
+	lsn_cur = le64_to_cpu(page->rhdr.lsn);
+	if (last_ok_lsn != lsn_cur &&
+	    expected_seq != (lsn_cur >> log->file_data_bits)) {
+		goto check_tail;
+	}
+
+	/*
+	 * Check that the page position and page count values are correct
+	 * If this is the first page of a transfer the position must be 1
+	 * and the count will be unknown
+	 */
+	if (page_cnt == page_pos) {
+		if (page->page_pos != cpu_to_le16(1) &&
+		    (!reuse_page || page->page_pos != page->page_count)) {
+			/*
+			 * If the current page is the first page we are
+			 * looking at and we are reusing this page then
+			 * it can be either the first or last page of a
+			 * transfer. Otherwise it can only be the first.
+			 */
+			goto check_tail;
+		}
+	} else if (le16_to_cpu(page->page_count) != page_cnt ||
+		   le16_to_cpu(page->page_pos) != page_pos + 1) {
+		/*
+		 * The page position better be 1 more than the last page
+		 * position and the page count better match
+		 */
+		goto check_tail;
+	}
+
+	/*
+	 * We have a valid page the file and may have a valid page
+	 * the tail copy area
+	 * If the tail page was written after the page the file then
+	 * break of the loop
+	 */
+	if (tail_page &&
+	    le64_to_cpu(tail_page->record_hdr.last_end_lsn) > lsn_cur) {
+		/* Remember if we will replace the page */
+		replace_page = true;
+		goto check_tail;
+	}
+
+	tail_page = NULL;
+
+	if (is_log_record_end(page)) {
+		/*
+		 * Since we have read this page we know the sequence number
+		 * is the same as our expected value
+		 */
+		log->seq_num = expected_seq;
+		log->last_lsn = le64_to_cpu(page->record_hdr.last_end_lsn);
+		log->ra->current_lsn = page->record_hdr.last_end_lsn;
+		log->l_flags &= ~NTFSLOG_NO_LAST_LSN;
+
+		/*
+		 * If there is room on this page for another header then
+		 * remember we want to reuse the page
+		 */
+		if (log->record_header_len <=
+		    log->page_size -
+			    le16_to_cpu(page->record_hdr.next_record_off)) {
+			log->l_flags |= NTFSLOG_REUSE_TAIL;
+			log->next_page = curpage_off;
+		} else {
+			log->l_flags &= ~NTFSLOG_REUSE_TAIL;
+			log->next_page = nextpage_off;
+		}
+
+		/* Remember if we wrapped the log file */
+		if (wrapped_file)
+			log->l_flags |= NTFSLOG_WRAPPED;
+	}
+
+	/*
+	 * Remember the last page count and position.
+	 * Also remember the last known lsn
+	 */
+	page_cnt = le16_to_cpu(page->page_count);
+	page_pos = le16_to_cpu(page->page_pos);
+	last_ok_lsn = le64_to_cpu(page->rhdr.lsn);
+
+next_page_1:
+
+	if (wrapped) {
+		expected_seq += 1;
+		wrapped_file = 1;
+	}
+
+	curpage_off = nextpage_off;
+	ntfs_free(page);
+	page = NULL;
+	reuse_page = 0;
+	goto next_page;
+
+check_tail:
+	if (tail_page) {
+		log->seq_num = expected_seq;
+		log->last_lsn = le64_to_cpu(tail_page->record_hdr.last_end_lsn);
+		log->ra->current_lsn = tail_page->record_hdr.last_end_lsn;
+		log->l_flags &= ~NTFSLOG_NO_LAST_LSN;
+
+		if (log->page_size -
+			    le16_to_cpu(
+				    tail_page->record_hdr.next_record_off) >=
+		    log->record_header_len) {
+			log->l_flags |= NTFSLOG_REUSE_TAIL;
+			log->next_page = curpage_off;
+		} else {
+			log->l_flags &= ~NTFSLOG_REUSE_TAIL;
+			log->next_page = nextpage_off;
+		}
+
+		if (wrapped)
+			log->l_flags |= NTFSLOG_WRAPPED;
+	}
+
+	/* Remember that the partial IO will start at the next page */
+	second_off = nextpage_off;
+
+	/*
+	 * If the next page is the first page of the file then update
+	 * the sequence number for log records which begon the next page
+	 */
+	if (wrapped)
+		expected_seq += 1;
+
+	/*
+	 * If we have a tail copy or are performing single page I/O we can
+	 * immediately look at the next page
+	 */
+	if (replace_page || (log->ra->flags & RESTART_SINGLE_PAGE_IO)) {
+		page_cnt = 2;
+		page_pos = 1;
+		goto check_valid;
+	}
+
+	if (page_pos != page_cnt)
+		goto check_valid;
+	/*
+	 * If the next page causes us to wrap to the beginning of the log
+	 * file then we know which page to check next.
+	 */
+	if (wrapped) {
+		page_cnt = 2;
+		page_pos = 1;
+		goto check_valid;
+	}
+
+	cur_pos = 2;
+
+next_test_page:
+	ntfs_free(tst_page);
+	tst_page = NULL;
+
+	/* Walk through the file, reading log pages */
+	err = read_log_page(log, nextpage_off, &tst_page, &usa_error);
+
+	/*
+	 * If we get a USA error then assume that we correctly found
+	 * the end of the original transfer
+	 */
+	if (usa_error)
+		goto file_is_valid;
+
+	/*
+	 * If we were able to read the page, we examine it to see if it
+	 * is the same or different Io block
+	 */
+	if (err)
+		goto next_test_page_1;
+
+	if (le16_to_cpu(tst_page->page_pos) == cur_pos &&
+	    check_subseq_log_page(log, tst_page, nextpage_off, expected_seq)) {
+		page_cnt = le16_to_cpu(tst_page->page_count) + 1;
+		page_pos = le16_to_cpu(tst_page->page_pos);
+		goto check_valid;
+	} else {
+		goto file_is_valid;
+	}
+
+next_test_page_1:
+
+	nextpage_off = next_page_off(log, curpage_off);
+	wrapped = nextpage_off == log->first_page;
+
+	if (wrapped) {
+		expected_seq += 1;
+		page_cnt = 2;
+		page_pos = 1;
+	}
+
+	cur_pos += 1;
+	part_io_count += 1;
+	if (!wrapped)
+		goto next_test_page;
+
+check_valid:
+	/* Skip over the remaining pages this transfer */
+	remain_pages = page_cnt - page_pos - 1;
+	part_io_count += remain_pages;
+
+	while (remain_pages--) {
+		nextpage_off = next_page_off(log, curpage_off);
+		wrapped = nextpage_off == log->first_page;
+
+		if (wrapped)
+			expected_seq += 1;
+	}
+
+	/* Call our routine to check this log page */
+	ntfs_free(tst_page);
+	tst_page = NULL;
+
+	err = read_log_page(log, nextpage_off, &tst_page, &usa_error);
+	if (!err && !usa_error &&
+	    check_subseq_log_page(log, tst_page, nextpage_off, expected_seq)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+file_is_valid:
+
+	/* We have a valid file */
+	if (page_off1 || tail_page) {
+		struct RECORD_PAGE_HDR *tmp_page;
+
+		if (sb_rdonly(log->ni->mi.sbi->sb)) {
+			err = -EROFS;
+			goto out;
+		}
+
+		if (page_off1) {
+			tmp_page = Add2Ptr(page_bufs, page_off1 - page_off);
+			tails -= (page_off1 - page_off) / log->page_size;
+			if (!tail_page)
+				tails -= 1;
+		} else {
+			tmp_page = tail_page;
+			tails = 1;
+		}
+
+		while (tails--) {
+			u64 off = hdr_file_off(log, tmp_page);
+
+			if (!page) {
+				page = ntfs_malloc(log->page_size);
+				if (!page)
+					return -ENOMEM;
+			}
+
+			/*
+			 * Correct page and copy the data from this page
+			 * into it and flush it to disk
+			 */
+			memcpy(page, tmp_page, log->page_size);
+
+			/* Fill last flushed lsn value flush the page */
+			if (log->major_ver < 2)
+				page->rhdr.lsn = page->record_hdr.last_end_lsn;
+			else
+				page->file_off = 0;
+
+			page->page_pos = page->page_count = cpu_to_le16(1);
+
+			ntfs_fix_pre_write(&page->rhdr, log->page_size);
+
+			err = ntfs_sb_write_run(log->ni->mi.sbi,
+						&log->ni->file.run, off, page,
+						log->page_size);
+
+			if (err)
+				goto out;
+
+			if (part_io_count && second_off == off) {
+				second_off += log->page_size;
+				part_io_count -= 1;
+			}
+
+			tmp_page = Add2Ptr(tmp_page, log->page_size);
+		}
+	}
+
+	if (part_io_count) {
+		if (sb_rdonly(log->ni->mi.sbi->sb)) {
+			err = -EROFS;
+			goto out;
+		}
+	}
+
+out:
+	ntfs_free(second_tail);
+	ntfs_free(first_tail);
+	ntfs_free(page);
+	ntfs_free(tst_page);
+	ntfs_free(page_bufs);
+
+	return err;
+}
+
+/*
+ * read_log_rec_buf
+ *
+ * copies a log record from the file to a buffer
+ * The log record may span several log pages and may even wrap the file
+ */
+static int read_log_rec_buf(struct ntfs_log *log,
+			    const struct LFS_RECORD_HDR *rh, void *buffer)
+{
+	int err;
+	struct RECORD_PAGE_HDR *ph = NULL;
+	u64 lsn = le64_to_cpu(rh->this_lsn);
+	u32 vbo = lsn_to_vbo(log, lsn) & ~log->page_mask;
+	u32 off = lsn_to_page_off(log, lsn) + log->record_header_len;
+	u32 data_len = le32_to_cpu(rh->client_data_len);
+
+	/*
+	 * While there are more bytes to transfer,
+	 * we continue to attempt to perform the read
+	 */
+	for (;;) {
+		bool usa_error;
+		u32 tail = log->page_size - off;
+
+		if (tail >= data_len)
+			tail = data_len;
+
+		data_len -= tail;
+
+		err = read_log_page(log, vbo, &ph, &usa_error);
+		if (err)
+			goto out;
+
+		/*
+		 * The last lsn on this page better be greater or equal
+		 * to the lsn we are copying
+		 */
+		if (lsn > le64_to_cpu(ph->rhdr.lsn)) {
+			err = -EINVAL;
+			goto out;
+		}
+
+		memcpy(buffer, Add2Ptr(ph, off), tail);
+
+		/* If there are no more bytes to transfer, we exit the loop */
+		if (!data_len) {
+			if (!is_log_record_end(ph) ||
+			    lsn > le64_to_cpu(ph->record_hdr.last_end_lsn)) {
+				err = -EINVAL;
+				goto out;
+			}
+			break;
+		}
+
+		if (ph->rhdr.lsn == ph->record_hdr.last_end_lsn ||
+		    lsn > le64_to_cpu(ph->rhdr.lsn)) {
+			err = -EINVAL;
+			goto out;
+		}
+
+		vbo = next_page_off(log, vbo);
+		off = log->data_off;
+
+		/*
+		 * adjust our pointer the user's buffer to transfer
+		 * the next block to
+		 */
+		buffer = Add2Ptr(buffer, tail);
+	}
+
+out:
+	ntfs_free(ph);
+	return err;
+}
+
+static int read_rst_area(struct ntfs_log *log, struct NTFS_RESTART **rst_,
+			 u64 *lsn)
+{
+	int err;
+	struct LFS_RECORD_HDR *rh = NULL;
+	const struct CLIENT_REC *cr =
+		Add2Ptr(log->ra, le16_to_cpu(log->ra->client_off));
+	u64 lsnr, lsnc = le64_to_cpu(cr->restart_lsn);
+	u32 len;
+	struct NTFS_RESTART *rst;
+
+	*lsn = 0;
+	*rst_ = NULL;
+
+	/* If the client doesn't have a restart area, go ahead and exit now */
+	if (!lsnc)
+		return 0;
+
+	err = read_log_page(log, lsn_to_vbo(log, lsnc),
+			    (struct RECORD_PAGE_HDR **)&rh, NULL);
+	if (err)
+		return err;
+
+	rst = NULL;
+	lsnr = le64_to_cpu(rh->this_lsn);
+
+	if (lsnc != lsnr) {
+		/* If the lsn values don't match, then the disk is corrupt */
+		err = -EINVAL;
+		goto out;
+	}
+
+	*lsn = lsnr;
+	len = le32_to_cpu(rh->client_data_len);
+
+	if (!len) {
+		err = 0;
+		goto out;
+	}
+
+	if (len < sizeof(struct NTFS_RESTART)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	rst = ntfs_malloc(len);
+	if (!rst) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* Copy the data into the 'rst' buffer */
+	err = read_log_rec_buf(log, rh, rst);
+	if (err)
+		goto out;
+
+	*rst_ = rst;
+	rst = NULL;
+
+out:
+	ntfs_free(rh);
+	ntfs_free(rst);
+
+	return err;
+}
+
+static int find_log_rec(struct ntfs_log *log, u64 lsn, struct lcb *lcb)
+{
+	int err;
+	struct LFS_RECORD_HDR *rh = lcb->lrh;
+	u32 rec_len, len;
+
+	/* Read the record header for this lsn */
+	if (!rh) {
+		err = read_log_page(log, lsn_to_vbo(log, lsn),
+				    (struct RECORD_PAGE_HDR **)&rh, NULL);
+
+		lcb->lrh = rh;
+		if (err)
+			return err;
+	}
+
+	/*
+	 * If the lsn the log record doesn't match the desired
+	 * lsn then the disk is corrupt
+	 */
+	if (lsn != le64_to_cpu(rh->this_lsn))
+		return -EINVAL;
+
+	len = le32_to_cpu(rh->client_data_len);
+
+	/*
+	 * check that the length field isn't greater than the total
+	 * available space the log file
+	 */
+	rec_len = len + log->record_header_len;
+	if (rec_len >= log->total_avail)
+		return -EINVAL;
+
+	/*
+	 * If the entire log record is on this log page,
+	 * put a pointer to the log record the context block
+	 */
+	if (rh->flags & LOG_RECORD_MULTI_PAGE) {
+		void *lr = ntfs_malloc(len);
+
+		if (!lr)
+			return -ENOMEM;
+
+		lcb->log_rec = lr;
+		lcb->alloc = true;
+
+		/* Copy the data into the buffer returned */
+		err = read_log_rec_buf(log, rh, lr);
+		if (err)
+			return err;
+	} else {
+		/* If beyond the end of the current page -> an error */
+		u32 page_off = lsn_to_page_off(log, lsn);
+
+		if (page_off + len + log->record_header_len > log->page_size)
+			return -EINVAL;
+
+		lcb->log_rec = Add2Ptr(rh, sizeof(struct LFS_RECORD_HDR));
+		lcb->alloc = false;
+	}
+
+	return 0;
+}
+
+/*
+ * read_log_rec_lcb
+ *
+ * initiates the query operation.
+ */
+static int read_log_rec_lcb(struct ntfs_log *log, u64 lsn, u32 ctx_mode,
+			    struct lcb **lcb_)
+{
+	int err;
+	const struct CLIENT_REC *cr;
+	struct lcb *lcb;
+
+	switch (ctx_mode) {
+	case lcb_ctx_undo_next:
+	case lcb_ctx_prev:
+	case lcb_ctx_next:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* check that the given lsn is the legal range for this client */
+	cr = Add2Ptr(log->ra, le16_to_cpu(log->ra->client_off));
+
+	if (!verify_client_lsn(log, cr, lsn))
+		return -EINVAL;
+
+	lcb = ntfs_zalloc(sizeof(struct lcb));
+	if (!lcb)
+		return -ENOMEM;
+	lcb->client = log->client_id;
+	lcb->ctx_mode = ctx_mode;
+
+	/* Find the log record indicated by the given lsn */
+	err = find_log_rec(log, lsn, lcb);
+	if (err)
+		goto out;
+
+	*lcb_ = lcb;
+	return 0;
+
+out:
+	lcb_put(lcb);
+	*lcb_ = NULL;
+	return err;
+}
+
+/*
+ * find_client_next_lsn
+ *
+ * attempt to find the next lsn to return to a client based on the context mode.
+ */
+static int find_client_next_lsn(struct ntfs_log *log, struct lcb *lcb, u64 *lsn)
+{
+	int err;
+	u64 next_lsn;
+	struct LFS_RECORD_HDR *hdr;
+
+	hdr = lcb->lrh;
+	*lsn = 0;
+
+	if (lcb_ctx_next != lcb->ctx_mode)
+		goto check_undo_next;
+
+	/* Loop as long as another lsn can be found */
+	for (;;) {
+		u64 current_lsn;
+
+		err = next_log_lsn(log, hdr, &current_lsn);
+		if (err)
+			goto out;
+
+		if (!current_lsn)
+			break;
+
+		if (hdr != lcb->lrh)
+			ntfs_free(hdr);
+
+		hdr = NULL;
+		err = read_log_page(log, lsn_to_vbo(log, current_lsn),
+				    (struct RECORD_PAGE_HDR **)&hdr, NULL);
+		if (err)
+			goto out;
+
+		if (memcmp(&hdr->client, &lcb->client,
+			   sizeof(struct CLIENT_ID))) {
+			/*err = -EINVAL; */
+		} else if (LfsClientRecord == hdr->record_type) {
+			ntfs_free(lcb->lrh);
+			lcb->lrh = hdr;
+			*lsn = current_lsn;
+			return 0;
+		}
+	}
+
+out:
+	if (hdr != lcb->lrh)
+		ntfs_free(hdr);
+	return err;
+
+check_undo_next:
+	if (lcb_ctx_undo_next == lcb->ctx_mode)
+		next_lsn = le64_to_cpu(hdr->client_undo_next_lsn);
+	else if (lcb_ctx_prev == lcb->ctx_mode)
+		next_lsn = le64_to_cpu(hdr->client_prev_lsn);
+	else
+		return 0;
+
+	if (!next_lsn)
+		return 0;
+
+	if (!verify_client_lsn(
+		    log, Add2Ptr(log->ra, le16_to_cpu(log->ra->client_off)),
+		    next_lsn))
+		return 0;
+
+	hdr = NULL;
+	err = read_log_page(log, lsn_to_vbo(log, next_lsn),
+			    (struct RECORD_PAGE_HDR **)&hdr, NULL);
+	if (err)
+		return err;
+	ntfs_free(lcb->lrh);
+	lcb->lrh = hdr;
+
+	*lsn = next_lsn;
+
+	return 0;
+}
+
+static int read_next_log_rec(struct ntfs_log *log, struct lcb *lcb, u64 *lsn)
+{
+	int err;
+
+	err = find_client_next_lsn(log, lcb, lsn);
+	if (err)
+		return err;
+
+	if (!*lsn)
+		return 0;
+
+	if (lcb->alloc)
+		ntfs_free(lcb->log_rec);
+
+	lcb->log_rec = NULL;
+	lcb->alloc = false;
+	ntfs_free(lcb->lrh);
+	lcb->lrh = NULL;
+
+	return find_log_rec(log, *lsn, lcb);
+}
+
+static inline bool check_index_header(const struct INDEX_HDR *hdr, size_t bytes)
+{
+	__le16 mask;
+	u32 min_de, de_off, used, total;
+	const struct NTFS_DE *e;
+
+	if (hdr_has_subnode(hdr)) {
+		min_de = sizeof(struct NTFS_DE) + sizeof(u64);
+		mask = NTFS_IE_HAS_SUBNODES;
+	} else {
+		min_de = sizeof(struct NTFS_DE);
+		mask = 0;
+	}
+
+	de_off = le32_to_cpu(hdr->de_off);
+	used = le32_to_cpu(hdr->used);
+	total = le32_to_cpu(hdr->total);
+
+	if (de_off > bytes - min_de || used > bytes || total > bytes ||
+	    de_off + min_de > used || used > total) {
+		return false;
+	}
+
+	e = Add2Ptr(hdr, de_off);
+	for (;;) {
+		u16 esize = le16_to_cpu(e->size);
+		struct NTFS_DE *next = Add2Ptr(e, esize);
+
+		if (esize < min_de || PtrOffset(hdr, next) > used ||
+		    (e->flags & NTFS_IE_HAS_SUBNODES) != mask) {
+			return false;
+		}
+
+		if (de_is_last(e))
+			break;
+
+		e = next;
+	}
+
+	return true;
+}
+
+static inline bool check_index_buffer(const struct INDEX_BUFFER *ib, u32 bytes)
+{
+	u16 fo;
+	const struct NTFS_RECORD_HEADER *r = &ib->rhdr;
+
+	if (r->sign != NTFS_INDX_SIGNATURE)
+		return false;
+
+	fo = (SECTOR_SIZE - ((bytes >> SECTOR_SHIFT) + 1) * sizeof(short));
+
+	if (le16_to_cpu(r->fix_off) > fo)
+		return false;
+
+	if ((le16_to_cpu(r->fix_num) - 1) * SECTOR_SIZE != bytes)
+		return false;
+
+	return check_index_header(&ib->ihdr,
+				  bytes - offsetof(struct INDEX_BUFFER, ihdr));
+}
+
+static inline bool check_index_root(const struct ATTRIB *attr,
+				    struct ntfs_sb_info *sbi)
+{
+	bool ret;
+	const struct INDEX_ROOT *root = resident_data(attr);
+	u8 index_bits =
+		le32_to_cpu(root->index_block_size) >= sbi->cluster_size ?
+			sbi->cluster_bits :
+			SECTOR_SHIFT;
+	u8 block_clst = root->index_block_clst;
+
+	if (le32_to_cpu(attr->res.data_size) < sizeof(struct INDEX_ROOT) ||
+	    (root->type != ATTR_NAME && root->type != ATTR_ZERO) ||
+	    (root->type == ATTR_NAME &&
+	     root->rule != NTFS_COLLATION_TYPE_FILENAME) ||
+	    (le32_to_cpu(root->index_block_size) !=
+	     (block_clst << index_bits)) ||
+	    (block_clst != 1 && block_clst != 2 && block_clst != 4 &&
+	     block_clst != 8 && block_clst != 0x10 && block_clst != 0x20 &&
+	     block_clst != 0x40 && block_clst != 0x80)) {
+		return false;
+	}
+
+	ret = check_index_header(&root->ihdr,
+				 le32_to_cpu(attr->res.data_size) -
+					 offsetof(struct INDEX_ROOT, ihdr));
+	return ret;
+}
+
+static inline bool check_attr(const struct MFT_REC *rec,
+			      const struct ATTRIB *attr,
+			      struct ntfs_sb_info *sbi)
+{
+	u32 asize = le32_to_cpu(attr->size);
+	u32 rsize = 0;
+	u64 dsize, svcn, evcn;
+	u16 run_off;
+
+	/* Check the fixed part of the attribute record header */
+	if (asize >= sbi->record_size ||
+	    asize + PtrOffset(rec, attr) >= sbi->record_size ||
+	    (attr->name_len &&
+	     le16_to_cpu(attr->name_off) + attr->name_len * sizeof(short) >
+		     asize)) {
+		return false;
+	}
+
+	/* Check the attribute fields */
+	switch (attr->non_res) {
+	case 0:
+		rsize = le32_to_cpu(attr->res.data_size);
+		if (rsize >= asize ||
+		    le16_to_cpu(attr->res.data_off) + rsize > asize) {
+			return false;
+		}
+		break;
+
+	case 1:
+		dsize = le64_to_cpu(attr->nres.data_size);
+		svcn = le64_to_cpu(attr->nres.svcn);
+		evcn = le64_to_cpu(attr->nres.evcn);
+		run_off = le16_to_cpu(attr->nres.run_off);
+
+		if (svcn > evcn + 1 || run_off >= asize ||
+		    le64_to_cpu(attr->nres.valid_size) > dsize ||
+		    dsize > le64_to_cpu(attr->nres.alloc_size)) {
+			return false;
+		}
+
+		if (run_unpack(NULL, sbi, 0, svcn, evcn, svcn,
+			       Add2Ptr(attr, run_off), asize - run_off) < 0) {
+			return false;
+		}
+
+		return true;
+
+	default:
+		return false;
+	}
+
+	switch (attr->type) {
+	case ATTR_NAME:
+		if (fname_full_size(Add2Ptr(
+			    attr, le16_to_cpu(attr->res.data_off))) > asize) {
+			return false;
+		}
+		break;
+
+	case ATTR_ROOT:
+		return check_index_root(attr, sbi);
+
+	case ATTR_STD:
+		if (rsize < sizeof(struct ATTR_STD_INFO5) &&
+		    rsize != sizeof(struct ATTR_STD_INFO)) {
+			return false;
+		}
+		break;
+
+	case ATTR_LIST:
+	case ATTR_ID:
+	case ATTR_SECURE:
+	case ATTR_LABEL:
+	case ATTR_VOL_INFO:
+	case ATTR_DATA:
+	case ATTR_ALLOC:
+	case ATTR_BITMAP:
+	case ATTR_REPARSE:
+	case ATTR_EA_INFO:
+	case ATTR_EA:
+	case ATTR_PROPERTYSET:
+	case ATTR_LOGGED_UTILITY_STREAM:
+		break;
+
+	default:
+		return false;
+	}
+
+	return true;
+}
+
+static inline bool check_file_record(const struct MFT_REC *rec,
+				     const struct MFT_REC *rec2,
+				     struct ntfs_sb_info *sbi)
+{
+	const struct ATTRIB *attr;
+	u16 fo = le16_to_cpu(rec->rhdr.fix_off);
+	u16 fn = le16_to_cpu(rec->rhdr.fix_num);
+	u16 ao = le16_to_cpu(rec->attr_off);
+	u32 rs = sbi->record_size;
+
+	/* check the file record header for consistency */
+	if (rec->rhdr.sign != NTFS_FILE_SIGNATURE ||
+	    fo > (SECTOR_SIZE - ((rs >> SECTOR_SHIFT) + 1) * sizeof(short)) ||
+	    (fn - 1) * SECTOR_SIZE != rs || ao < MFTRECORD_FIXUP_OFFSET_1 ||
+	    ao > sbi->record_size - SIZEOF_RESIDENT || !is_rec_inuse(rec) ||
+	    le32_to_cpu(rec->total) != rs) {
+		return false;
+	}
+
+	/* Loop to check all of the attributes */
+	for (attr = Add2Ptr(rec, ao); attr->type != ATTR_END;
+	     attr = Add2Ptr(attr, le32_to_cpu(attr->size))) {
+		if (check_attr(rec, attr, sbi))
+			continue;
+		return false;
+	}
+
+	return true;
+}
+
+static inline int check_lsn(const struct NTFS_RECORD_HEADER *hdr,
+			    const u64 *rlsn)
+{
+	u64 lsn;
+
+	if (!rlsn)
+		return true;
+
+	lsn = le64_to_cpu(hdr->lsn);
+
+	if (hdr->sign == NTFS_HOLE_SIGNATURE)
+		return false;
+
+	if (*rlsn > lsn)
+		return true;
+
+	return false;
+}
+
+static inline bool check_if_attr(const struct MFT_REC *rec,
+				 const struct LOG_REC_HDR *lrh)
+{
+	u16 ro = le16_to_cpu(lrh->record_off);
+	u16 o = le16_to_cpu(rec->attr_off);
+	const struct ATTRIB *attr = Add2Ptr(rec, o);
+
+	while (o < ro) {
+		u32 asize;
+
+		if (attr->type == ATTR_END)
+			break;
+
+		asize = le32_to_cpu(attr->size);
+		if (!asize)
+			break;
+
+		o += asize;
+		attr = Add2Ptr(attr, asize);
+	}
+
+	return o == ro;
+}
+
+static inline bool check_if_index_root(const struct MFT_REC *rec,
+				       const struct LOG_REC_HDR *lrh)
+{
+	u16 ro = le16_to_cpu(lrh->record_off);
+	u16 o = le16_to_cpu(rec->attr_off);
+	const struct ATTRIB *attr = Add2Ptr(rec, o);
+
+	while (o < ro) {
+		u32 asize;
+
+		if (attr->type == ATTR_END)
+			break;
+
+		asize = le32_to_cpu(attr->size);
+		if (!asize)
+			break;
+
+		o += asize;
+		attr = Add2Ptr(attr, asize);
+	}
+
+	return o == ro && attr->type == ATTR_ROOT;
+}
+
+static inline bool check_if_root_index(const struct ATTRIB *attr,
+				       const struct INDEX_HDR *hdr,
+				       const struct LOG_REC_HDR *lrh)
+{
+	u16 ao = le16_to_cpu(lrh->attr_off);
+	u32 de_off = le32_to_cpu(hdr->de_off);
+	u32 o = PtrOffset(attr, hdr) + de_off;
+	const struct NTFS_DE *e = Add2Ptr(hdr, de_off);
+	u32 asize = le32_to_cpu(attr->size);
+
+	while (o < ao) {
+		u16 esize;
+
+		if (o >= asize)
+			break;
+
+		esize = le16_to_cpu(e->size);
+		if (!esize)
+			break;
+
+		o += esize;
+		e = Add2Ptr(e, esize);
+	}
+
+	return o == ao;
+}
+
+static inline bool check_if_alloc_index(const struct INDEX_HDR *hdr,
+					u32 attr_off)
+{
+	u32 de_off = le32_to_cpu(hdr->de_off);
+	u32 o = offsetof(struct INDEX_BUFFER, ihdr) + de_off;
+	const struct NTFS_DE *e = Add2Ptr(hdr, de_off);
+	u32 used = le32_to_cpu(hdr->used);
+
+	while (o < attr_off) {
+		u16 esize;
+
+		if (de_off >= used)
+			break;
+
+		esize = le16_to_cpu(e->size);
+		if (!esize)
+			break;
+
+		o += esize;
+		de_off += esize;
+		e = Add2Ptr(e, esize);
+	}
+
+	return o == attr_off;
+}
+
+static inline void change_attr_size(struct MFT_REC *rec, struct ATTRIB *attr,
+				    u32 nsize)
+{
+	u32 asize = le32_to_cpu(attr->size);
+	int dsize = nsize - asize;
+	u8 *next = Add2Ptr(attr, asize);
+	u32 used = le32_to_cpu(rec->used);
+
+	memmove(Add2Ptr(attr, nsize), next, used - PtrOffset(rec, next));
+
+	rec->used = cpu_to_le32(used + dsize);
+	attr->size = cpu_to_le32(nsize);
+}
+
+struct OpenAttr {
+	struct ATTRIB *attr;
+	struct runs_tree *run1;
+	struct runs_tree run0;
+	struct ntfs_inode *ni;
+	// CLST rno;
+};
+
+/* Returns 0 if 'attr' has the same type and name */
+static inline int cmp_type_and_name(const struct ATTRIB *a1,
+				    const struct ATTRIB *a2)
+{
+	return a1->type != a2->type || a1->name_len != a2->name_len ||
+	       (a1->name_len && memcmp(attr_name(a1), attr_name(a2),
+				       a1->name_len * sizeof(short)));
+}
+
+static struct OpenAttr *find_loaded_attr(struct ntfs_log *log,
+					 const struct ATTRIB *attr, CLST rno)
+{
+	struct OPEN_ATTR_ENRTY *oe = NULL;
+
+	while ((oe = enum_rstbl(log->open_attr_tbl, oe))) {
+		struct OpenAttr *op_attr;
+
+		if (ino_get(&oe->ref) != rno)
+			continue;
+
+		op_attr = (struct OpenAttr *)oe->ptr;
+		if (!cmp_type_and_name(op_attr->attr, attr))
+			return op_attr;
+	}
+	return NULL;
+}
+
+static struct ATTRIB *attr_create_nonres_log(struct ntfs_sb_info *sbi,
+					     enum ATTR_TYPE type, u64 size,
+					     const u16 *name, size_t name_len,
+					     __le16 flags)
+{
+	struct ATTRIB *attr;
+	u32 name_size = QuadAlign(name_len * sizeof(short));
+	bool is_ext = flags & (ATTR_FLAG_COMPRESSED | ATTR_FLAG_SPARSED);
+	u32 asize = name_size +
+		    (is_ext ? SIZEOF_NONRESIDENT_EX : SIZEOF_NONRESIDENT);
+
+	attr = ntfs_zalloc(asize);
+	if (!attr)
+		return NULL;
+
+	attr->type = type;
+	attr->size = cpu_to_le32(asize);
+	attr->flags = flags;
+	attr->non_res = 1;
+	attr->name_len = name_len;
+
+	attr->nres.evcn = cpu_to_le64((u64)bytes_to_cluster(sbi, size) - 1);
+	attr->nres.alloc_size = cpu_to_le64(ntfs_up_cluster(sbi, size));
+	attr->nres.data_size = cpu_to_le64(size);
+	attr->nres.valid_size = attr->nres.data_size;
+	if (is_ext) {
+		attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
+		if (is_attr_compressed(attr))
+			attr->nres.c_unit = COMPRESSION_UNIT;
+
+		attr->nres.run_off =
+			cpu_to_le16(SIZEOF_NONRESIDENT_EX + name_size);
+		memcpy(Add2Ptr(attr, SIZEOF_NONRESIDENT_EX), name,
+		       name_len * sizeof(short));
+	} else {
+		attr->name_off = SIZEOF_NONRESIDENT_LE;
+		attr->nres.run_off =
+			cpu_to_le16(SIZEOF_NONRESIDENT + name_size);
+		memcpy(Add2Ptr(attr, SIZEOF_NONRESIDENT), name,
+		       name_len * sizeof(short));
+	}
+
+	return attr;
+}
+
+/*
+ * do_action
+ *
+ * common routine for the Redo and Undo Passes
+ * If rlsn is NULL then undo
+ */
+static int do_action(struct ntfs_log *log, struct OPEN_ATTR_ENRTY *oe,
+		     const struct LOG_REC_HDR *lrh, u32 op, void *data,
+		     u32 dlen, u32 rec_len, const u64 *rlsn)
+{
+	int err = 0;
+	struct ntfs_sb_info *sbi = log->ni->mi.sbi;
+	struct inode *inode = NULL, *inode_parent;
+	struct mft_inode *mi = NULL, *mi2_child = NULL;
+	CLST rno = 0, rno_base = 0;
+	struct INDEX_BUFFER *ib = NULL;
+	struct MFT_REC *rec = NULL;
+	struct ATTRIB *attr = NULL, *attr2;
+	struct INDEX_HDR *hdr;
+	struct INDEX_ROOT *root;
+	struct NTFS_DE *e, *e1, *e2;
+	struct NEW_ATTRIBUTE_SIZES *new_sz;
+	struct ATTR_FILE_NAME *fname;
+	struct OpenAttr *oa, *oa2;
+	u32 nsize, t32, asize, used, esize, bmp_off, bmp_bits;
+	u16 t16, id, id2;
+	u32 record_size = sbi->record_size;
+	u64 t64;
+	u64 lco = 0;
+	u64 cbo = (u64)le16_to_cpu(lrh->cluster_off) << SECTOR_SHIFT;
+	u64 tvo = le64_to_cpu(lrh->target_vcn) << sbi->cluster_bits;
+	u64 vbo = cbo + tvo;
+	void *buffer_le = NULL;
+	u32 bytes = 0;
+	bool a_dirty = false;
+	u16 data_off;
+
+	oa = oe->ptr;
+
+	/* Big switch to prepare */
+	switch (op) {
+	/* ============================================================
+	 * Process MFT records, as described by the current log record
+	 * ============================================================
+	 */
+	case InitializeFileRecordSegment:
+	case DeallocateFileRecordSegment:
+	case WriteEndOfFileRecordSegment:
+	case CreateAttribute:
+	case DeleteAttribute:
+	case UpdateResidentValue:
+	case UpdateMappingPairs:
+	case SetNewAttributeSizes:
+	case AddIndexEntryRoot:
+	case DeleteIndexEntryRoot:
+	case SetIndexEntryVcnRoot:
+	case UpdateFileNameRoot:
+	case UpdateRecordDataRoot:
+	case ZeroEndOfFileRecord:
+
+		rno = vbo >> sbi->record_bits;
+		inode = ilookup(sbi->sb, rno);
+		if (inode) {
+			mi = &ntfs_i(inode)->mi;
+		} else if (op == InitializeFileRecordSegment) {
+			mi = ntfs_zalloc(sizeof(struct mft_inode));
+			if (!mi)
+				return -ENOMEM;
+			err = mi_format_new(mi, sbi, rno, 0, false);
+			if (err)
+				goto out;
+		} else {
+			/* read from disk */
+			err = mi_get(sbi, rno, &mi);
+			if (err)
+				return err;
+		}
+		rec = mi->mrec;
+
+		if (op == DeallocateFileRecordSegment)
+			goto skip_load_parent;
+
+		if (InitializeFileRecordSegment != op) {
+			if (rec->rhdr.sign == NTFS_BAAD_SIGNATURE)
+				goto dirty_vol;
+			if (!check_lsn(&rec->rhdr, rlsn))
+				goto out;
+			if (!check_file_record(rec, NULL, sbi))
+				goto dirty_vol;
+			attr = Add2Ptr(rec, le16_to_cpu(lrh->record_off));
+		}
+
+		if (is_rec_base(rec) || InitializeFileRecordSegment == op) {
+			rno_base = rno;
+			goto skip_load_parent;
+		}
+
+		rno_base = ino_get(&rec->parent_ref);
+		inode_parent = ntfs_iget5(sbi->sb, &rec->parent_ref, NULL);
+		if (IS_ERR(inode_parent))
+			goto skip_load_parent;
+
+		if (is_bad_inode(inode_parent)) {
+			iput(inode_parent);
+			goto skip_load_parent;
+		}
+
+		if (ni_load_mi_ex(ntfs_i(inode_parent), rno, &mi2_child)) {
+			iput(inode_parent);
+		} else {
+			if (mi2_child->mrec != mi->mrec)
+				memcpy(mi2_child->mrec, mi->mrec,
+				       sbi->record_size);
+
+			if (inode)
+				iput(inode);
+			else if (mi)
+				mi_put(mi);
+
+			inode = inode_parent;
+			mi = mi2_child;
+			rec = mi2_child->mrec;
+			attr = Add2Ptr(rec, le16_to_cpu(lrh->record_off));
+		}
+
+skip_load_parent:
+		inode_parent = NULL;
+		break;
+
+	/* ============================================================
+	 * Process attributes, as described by the current log record
+	 * ============================================================
+	 */
+	case UpdateNonresidentValue:
+	case AddIndexEntryAllocation:
+	case DeleteIndexEntryAllocation:
+	case WriteEndOfIndexBuffer:
+	case SetIndexEntryVcnAllocation:
+	case UpdateFileNameAllocation:
+	case SetBitsInNonresidentBitMap:
+	case ClearBitsInNonresidentBitMap:
+	case UpdateRecordDataAllocation:
+
+		attr = oa->attr;
+		bytes = UpdateNonresidentValue == op ? dlen : 0;
+		lco = (u64)le16_to_cpu(lrh->lcns_follow) << sbi->cluster_bits;
+
+		if (attr->type == ATTR_ALLOC) {
+			t32 = le32_to_cpu(oe->bytes_per_index);
+			if (bytes < t32)
+				bytes = t32;
+		}
+
+		if (!bytes)
+			bytes = lco - cbo;
+
+		bytes += le16_to_cpu(lrh->record_off);
+		if (attr->type == ATTR_ALLOC)
+			bytes = (bytes + 511) & ~511; // align
+
+		buffer_le = ntfs_malloc(bytes);
+		if (!buffer_le)
+			return -ENOMEM;
+
+		err = ntfs_read_run_nb(sbi, oa->run1, vbo, buffer_le, bytes,
+				       NULL);
+		if (err)
+			goto out;
+
+		if (attr->type == ATTR_ALLOC && *(int *)buffer_le)
+			ntfs_fix_post_read(buffer_le, bytes, false);
+		break;
+
+	default:
+		WARN_ON(1);
+	}
+
+	/* Big switch to do operation */
+	switch (op) {
+	case InitializeFileRecordSegment:
+		t16 = le16_to_cpu(lrh->record_off);
+		if (t16 + dlen > record_size)
+			goto dirty_vol;
+
+		memcpy(Add2Ptr(rec, t16), data, dlen);
+		mi->dirty = true;
+		break;
+
+	case DeallocateFileRecordSegment:
+		clear_rec_inuse(rec);
+		le16_add_cpu(&rec->seq, 1);
+		mi->dirty = true;
+		break;
+
+	case WriteEndOfFileRecordSegment:
+		attr2 = (struct ATTRIB *)data;
+		t16 = le16_to_cpu(lrh->record_off);
+
+		if (!check_if_attr(rec, lrh) || t16 + dlen > record_size)
+			goto dirty_vol;
+
+		memmove(attr, attr2, dlen);
+		rec->used = cpu_to_le32(QuadAlign(t16 + dlen));
+
+		mi->dirty = true;
+		break;
+
+	case CreateAttribute:
+		attr2 = (struct ATTRIB *)data;
+		asize = le32_to_cpu(attr2->size);
+		used = le32_to_cpu(rec->used);
+		t16 = le16_to_cpu(lrh->record_off);
+
+		if (!check_if_attr(rec, lrh) || dlen < SIZEOF_RESIDENT ||
+		    !IsQuadAligned(asize) ||
+		    Add2Ptr(attr2, asize) > Add2Ptr(lrh, rec_len) ||
+		    dlen > record_size - used) {
+			goto dirty_vol;
+		}
+
+		memmove(Add2Ptr(attr, asize), attr, used - t16);
+		memcpy(attr, attr2, asize);
+
+		rec->used = cpu_to_le32(used + asize);
+		id = le16_to_cpu(rec->next_attr_id);
+		id2 = le16_to_cpu(attr2->id);
+		if (id <= id2)
+			rec->next_attr_id = cpu_to_le16(id2 + 1);
+		if (is_attr_indexed(attr))
+			le16_add_cpu(&rec->hard_links, 1);
+
+		oa2 = find_loaded_attr(log, attr, rno_base);
+		if (oa2) {
+			void *p2 = ntfs_memdup(attr, le32_to_cpu(attr->size));
+
+			if (p2) {
+				// run_close(oa2->run1);
+				ntfs_free(oa2->attr);
+				oa2->attr = p2;
+			}
+		}
+
+		mi->dirty = true;
+		break;
+
+	case DeleteAttribute:
+		asize = le32_to_cpu(attr->size);
+		used = le32_to_cpu(rec->used);
+		t16 = le16_to_cpu(lrh->record_off);
+
+		if (!check_if_attr(rec, lrh))
+			goto dirty_vol;
+
+		rec->used = cpu_to_le32(used - asize);
+		if (is_attr_indexed(attr))
+			le16_add_cpu(&rec->hard_links, -1);
+
+		memmove(attr, Add2Ptr(attr, asize), used - t16);
+
+		mi->dirty = true;
+		break;
+
+	case UpdateResidentValue:
+		t16 = le16_to_cpu(lrh->attr_off);
+		nsize = t16 + dlen;
+
+		if (!check_if_attr(rec, lrh))
+			goto dirty_vol;
+
+		asize = le32_to_cpu(attr->size);
+		used = le32_to_cpu(rec->used);
+
+		if (lrh->redo_len == lrh->undo_len) {
+			if (nsize > asize)
+				goto dirty_vol;
+			goto move_data;
+		}
+
+		if (nsize > asize && nsize - asize > record_size - used)
+			goto dirty_vol;
+
+		nsize = QuadAlign(nsize);
+		data_off = le16_to_cpu(attr->res.data_off);
+
+		if (nsize < asize) {
+			memmove(Add2Ptr(attr, t16), data, dlen);
+			data = NULL; // To skip below memmove
+		}
+
+		memmove(Add2Ptr(attr, nsize), Add2Ptr(attr, asize),
+			used - le16_to_cpu(lrh->record_off) - asize);
+
+		rec->used = cpu_to_le32(used + nsize - asize);
+		attr->size = cpu_to_le32(nsize);
+		attr->res.data_size = cpu_to_le32(t16 + dlen - data_off);
+
+move_data:
+		if (data)
+			memmove(Add2Ptr(attr, t16), data, dlen);
+
+		oa2 = find_loaded_attr(log, attr, rno_base);
+		if (oa2) {
+			void *p2 = ntfs_memdup(attr, le32_to_cpu(attr->size));
+
+			if (p2) {
+				// run_close(&oa2->run0);
+				oa2->run1 = &oa2->run0;
+				ntfs_free(oa2->attr);
+				oa2->attr = p2;
+			}
+		}
+
+		mi->dirty = true;
+		break;
+
+	case UpdateMappingPairs:
+		t16 = le16_to_cpu(lrh->attr_off);
+		nsize = t16 + dlen;
+		asize = le32_to_cpu(attr->size);
+		used = le32_to_cpu(rec->used);
+
+		if (!check_if_attr(rec, lrh) || !attr->non_res ||
+		    t16 < le16_to_cpu(attr->nres.run_off) || t16 > asize ||
+		    (nsize > asize && nsize - asize > record_size - used)) {
+			goto dirty_vol;
+		}
+
+		nsize = QuadAlign(nsize);
+
+		memmove(Add2Ptr(attr, nsize), Add2Ptr(attr, asize),
+			used - le16_to_cpu(lrh->record_off) - asize);
+		rec->used = cpu_to_le32(used + nsize - asize);
+		attr->size = cpu_to_le32(nsize);
+		memmove(Add2Ptr(attr, t16), data, dlen);
+
+		if (run_get_highest_vcn(le64_to_cpu(attr->nres.svcn),
+					attr_run(attr), &t64)) {
+			goto dirty_vol;
+		}
+
+		attr->nres.evcn = cpu_to_le64(t64);
+		oa2 = find_loaded_attr(log, attr, rno_base);
+		if (oa2 && oa2->attr->non_res)
+			oa2->attr->nres.evcn = attr->nres.evcn;
+
+		mi->dirty = true;
+		break;
+
+	case SetNewAttributeSizes:
+		new_sz = data;
+
+		if (!check_if_attr(rec, lrh) || !attr->non_res)
+			goto dirty_vol;
+
+		attr->nres.alloc_size = new_sz->alloc_size;
+		attr->nres.data_size = new_sz->data_size;
+		attr->nres.valid_size = new_sz->valid_size;
+
+		if (dlen >= sizeof(struct NEW_ATTRIBUTE_SIZES))
+			attr->nres.total_size = new_sz->total_size;
+
+		oa2 = find_loaded_attr(log, attr, rno_base);
+		if (oa2) {
+			void *p2 = ntfs_memdup(attr, le32_to_cpu(attr->size));
+
+			if (p2) {
+				ntfs_free(oa2->attr);
+				oa2->attr = p2;
+			}
+		}
+		mi->dirty = true;
+		break;
+
+	case AddIndexEntryRoot:
+		e = (struct NTFS_DE *)data;
+		esize = le16_to_cpu(e->size);
+		root = resident_data(attr);
+		hdr = &root->ihdr;
+		used = le32_to_cpu(hdr->used);
+
+		if (!check_if_index_root(rec, lrh) ||
+		    !check_if_root_index(attr, hdr, lrh) ||
+		    Add2Ptr(data, esize) > Add2Ptr(lrh, rec_len) ||
+		    esize > le32_to_cpu(rec->total) - le32_to_cpu(rec->used)) {
+			goto dirty_vol;
+		}
+
+		e1 = Add2Ptr(attr, le16_to_cpu(lrh->attr_off));
+
+		change_attr_size(rec, attr, le32_to_cpu(attr->size) + esize);
+
+		memmove(Add2Ptr(e1, esize), e1,
+			PtrOffset(e1, Add2Ptr(hdr, used)));
+		memmove(e1, e, esize);
+
+		le32_add_cpu(&attr->res.data_size, esize);
+		hdr->used = cpu_to_le32(used + esize);
+		le32_add_cpu(&hdr->total, esize);
+
+		mi->dirty = true;
+		break;
+
+	case DeleteIndexEntryRoot:
+		root = resident_data(attr);
+		hdr = &root->ihdr;
+		used = le32_to_cpu(hdr->used);
+
+		if (!check_if_index_root(rec, lrh) ||
+		    !check_if_root_index(attr, hdr, lrh)) {
+			goto dirty_vol;
+		}
+
+		e1 = Add2Ptr(attr, le16_to_cpu(lrh->attr_off));
+		esize = le16_to_cpu(e1->size);
+		e2 = Add2Ptr(e1, esize);
+
+		memmove(e1, e2, PtrOffset(e2, Add2Ptr(hdr, used)));
+
+		le32_sub_cpu(&attr->res.data_size, esize);
+		hdr->used = cpu_to_le32(used - esize);
+		le32_sub_cpu(&hdr->total, esize);
+
+		change_attr_size(rec, attr, le32_to_cpu(attr->size) - esize);
+
+		mi->dirty = true;
+		break;
+
+	case SetIndexEntryVcnRoot:
+		root = resident_data(attr);
+		hdr = &root->ihdr;
+
+		if (!check_if_index_root(rec, lrh) ||
+		    !check_if_root_index(attr, hdr, lrh)) {
+			goto dirty_vol;
+		}
+
+		e = Add2Ptr(attr, le16_to_cpu(lrh->attr_off));
+
+		de_set_vbn_le(e, *(__le64 *)data);
+		mi->dirty = true;
+		break;
+
+	case UpdateFileNameRoot:
+		root = resident_data(attr);
+		hdr = &root->ihdr;
+
+		if (!check_if_index_root(rec, lrh) ||
+		    !check_if_root_index(attr, hdr, lrh)) {
+			goto dirty_vol;
+		}
+
+		e = Add2Ptr(attr, le16_to_cpu(lrh->attr_off));
+		fname = (struct ATTR_FILE_NAME *)(e + 1);
+		memmove(&fname->dup, data, sizeof(fname->dup)); //
+		mi->dirty = true;
+		break;
+
+	case UpdateRecordDataRoot:
+		root = resident_data(attr);
+		hdr = &root->ihdr;
+
+		if (!check_if_index_root(rec, lrh) ||
+		    !check_if_root_index(attr, hdr, lrh)) {
+			goto dirty_vol;
+		}
+
+		e = Add2Ptr(attr, le16_to_cpu(lrh->attr_off));
+
+		memmove(Add2Ptr(e, le16_to_cpu(e->view.data_off)), data, dlen);
+
+		mi->dirty = true;
+		break;
+
+	case ZeroEndOfFileRecord:
+		t16 = le16_to_cpu(lrh->record_off);
+		if (t16 + dlen > record_size)
+			goto dirty_vol;
+
+		memset(attr, 0, dlen);
+		mi->dirty = true;
+		break;
+
+	case UpdateNonresidentValue:
+		t16 = le16_to_cpu(lrh->record_off);
+
+		if (lco < cbo + t16 + dlen)
+			goto dirty_vol;
+
+		memcpy(Add2Ptr(buffer_le, t16), data, dlen);
+
+		a_dirty = true;
+		if (attr->type == ATTR_ALLOC)
+			ntfs_fix_pre_write(buffer_le, bytes);
+		break;
+
+	case AddIndexEntryAllocation:
+		t16 = le16_to_cpu(lrh->record_off);
+		ib = Add2Ptr(buffer_le, t16);
+		hdr = &ib->ihdr;
+		e = data;
+		esize = le16_to_cpu(e->size);
+		t16 = le16_to_cpu(lrh->attr_off);
+		e1 = Add2Ptr(ib, t16);
+
+		if (is_baad(&ib->rhdr))
+			goto dirty_vol;
+		if (!check_lsn(&ib->rhdr, rlsn))
+			goto out;
+
+		used = le32_to_cpu(hdr->used);
+
+		if (!check_index_buffer(ib, bytes) ||
+		    !check_if_alloc_index(hdr, t16) ||
+		    Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) ||
+		    used + esize > le32_to_cpu(hdr->total)) {
+			goto dirty_vol;
+		}
+
+		memmove(Add2Ptr(e1, esize), e1,
+			PtrOffset(e1, Add2Ptr(hdr, used)));
+		memcpy(e1, e, esize);
+
+		hdr->used = cpu_to_le32(used + esize);
+
+		a_dirty = true;
+
+		ntfs_fix_pre_write(&ib->rhdr, bytes);
+		break;
+
+	case DeleteIndexEntryAllocation:
+		t16 = le16_to_cpu(lrh->record_off);
+		ib = Add2Ptr(buffer_le, t16);
+		hdr = &ib->ihdr;
+		t16 = le16_to_cpu(lrh->attr_off);
+		e = Add2Ptr(ib, t16);
+		esize = le16_to_cpu(e->size);
+
+		if (is_baad(&ib->rhdr))
+			goto dirty_vol;
+		if (!check_lsn(&ib->rhdr, rlsn))
+			goto out;
+
+		if (!check_index_buffer(ib, bytes) ||
+		    !check_if_alloc_index(hdr, t16)) {
+			goto dirty_vol;
+		}
+
+		e1 = Add2Ptr(e, esize);
+		nsize = esize;
+		used = le32_to_cpu(hdr->used);
+
+		memmove(e, e1, PtrOffset(e1, Add2Ptr(hdr, used)));
+
+		hdr->used = cpu_to_le32(used - nsize);
+
+		a_dirty = true;
+
+		ntfs_fix_pre_write(&ib->rhdr, bytes);
+		break;
+
+	case WriteEndOfIndexBuffer:
+		t16 = le16_to_cpu(lrh->record_off);
+		ib = Add2Ptr(buffer_le, t16);
+		hdr = &ib->ihdr;
+		t16 = le16_to_cpu(lrh->attr_off);
+		e = Add2Ptr(ib, t16);
+
+		if (is_baad(&ib->rhdr))
+			goto dirty_vol;
+		if (!check_lsn(&ib->rhdr, rlsn))
+			goto out;
+		if (!check_index_buffer(ib, bytes) ||
+		    !check_if_alloc_index(hdr, t16) ||
+		    t16 + dlen > offsetof(struct INDEX_BUFFER, ihdr) +
+					 le32_to_cpu(hdr->total)) {
+			goto dirty_vol;
+		}
+
+		hdr->used = cpu_to_le32(dlen + PtrOffset(hdr, e));
+		memmove(e, data, dlen);
+
+		a_dirty = true;
+		ntfs_fix_pre_write(&ib->rhdr, bytes);
+		break;
+
+	case SetIndexEntryVcnAllocation:
+		t16 = le16_to_cpu(lrh->record_off);
+		ib = Add2Ptr(buffer_le, t16);
+		hdr = &ib->ihdr;
+		t16 = le16_to_cpu(lrh->attr_off);
+		e = Add2Ptr(ib, t16);
+
+		if (is_baad(&ib->rhdr))
+			goto dirty_vol;
+
+		if (!check_lsn(&ib->rhdr, rlsn))
+			goto out;
+		if (!check_index_buffer(ib, bytes) ||
+		    !check_if_alloc_index(hdr, t16)) {
+			goto dirty_vol;
+		}
+
+		de_set_vbn_le(e, *(__le64 *)data);
+
+		a_dirty = true;
+		ntfs_fix_pre_write(&ib->rhdr, bytes);
+		break;
+
+	case UpdateFileNameAllocation:
+		t16 = le16_to_cpu(lrh->record_off);
+		ib = Add2Ptr(buffer_le, t16);
+		hdr = &ib->ihdr;
+		t16 = le16_to_cpu(lrh->attr_off);
+		e = Add2Ptr(ib, t16);
+
+		if (is_baad(&ib->rhdr))
+			goto dirty_vol;
+
+		if (!check_lsn(&ib->rhdr, rlsn))
+			goto out;
+		if (!check_index_buffer(ib, bytes) ||
+		    !check_if_alloc_index(hdr, t16)) {
+			goto dirty_vol;
+		}
+
+		fname = (struct ATTR_FILE_NAME *)(e + 1);
+		memmove(&fname->dup, data, sizeof(fname->dup));
+
+		a_dirty = true;
+		ntfs_fix_pre_write(&ib->rhdr, bytes);
+		break;
+
+	case SetBitsInNonresidentBitMap:
+		bmp_off =
+			le32_to_cpu(((struct BITMAP_RANGE *)data)->bitmap_off);
+		bmp_bits = le32_to_cpu(((struct BITMAP_RANGE *)data)->bits);
+		t16 = le16_to_cpu(lrh->record_off);
+
+		if (cbo + (bmp_off + 7) / 8 > lco ||
+		    cbo + ((bmp_off + bmp_bits + 7) / 8) > lco) {
+			goto dirty_vol;
+		}
+
+		__bitmap_set(Add2Ptr(buffer_le, t16), bmp_off, bmp_bits);
+		a_dirty = true;
+		break;
+
+	case ClearBitsInNonresidentBitMap:
+		bmp_off =
+			le32_to_cpu(((struct BITMAP_RANGE *)data)->bitmap_off);
+		bmp_bits = le32_to_cpu(((struct BITMAP_RANGE *)data)->bits);
+		t16 = le16_to_cpu(lrh->record_off);
+
+		if (cbo + (bmp_off + 7) / 8 > lco ||
+		    cbo + ((bmp_off + bmp_bits + 7) / 8) > lco) {
+			goto dirty_vol;
+		}
+
+		__bitmap_clear(Add2Ptr(buffer_le, t16), bmp_off, bmp_bits);
+		a_dirty = true;
+		break;
+
+	case UpdateRecordDataAllocation:
+		t16 = le16_to_cpu(lrh->record_off);
+		ib = Add2Ptr(buffer_le, t16);
+		hdr = &ib->ihdr;
+		t16 = le16_to_cpu(lrh->attr_off);
+		e = Add2Ptr(ib, t16);
+
+		if (is_baad(&ib->rhdr))
+			goto dirty_vol;
+
+		if (!check_lsn(&ib->rhdr, rlsn))
+			goto out;
+		if (!check_index_buffer(ib, bytes) ||
+		    !check_if_alloc_index(hdr, t16)) {
+			goto dirty_vol;
+		}
+
+		memmove(Add2Ptr(e, le16_to_cpu(e->view.data_off)), data, dlen);
+
+		a_dirty = true;
+		ntfs_fix_pre_write(&ib->rhdr, bytes);
+		break;
+
+	default:
+		WARN_ON(1);
+	}
+
+	if (rlsn) {
+		__le64 t64 = cpu_to_le64(*rlsn);
+
+		if (rec)
+			rec->rhdr.lsn = t64;
+		if (ib)
+			ib->rhdr.lsn = t64;
+	}
+
+	if (inode) {
+		err = _ni_write_inode(inode, 0);
+	} else if (mi && mi->dirty) {
+		err = mi_write(mi, 0);
+		if (err)
+			goto out;
+	}
+
+	if (a_dirty) {
+		attr = oa->attr;
+		err = ntfs_sb_write_run(sbi, oa->run1, vbo, buffer_le, bytes);
+		if (err)
+			goto out;
+	}
+
+out:
+
+	if (inode)
+		iput(inode);
+	else if (mi != mi2_child)
+		mi_put(mi);
+
+	ntfs_free(buffer_le);
+
+	return err;
+
+dirty_vol:
+	log->set_dirty = true;
+	goto out;
+}
+
+/*
+ * log_replay
+ *
+ * this function is called during mount operation
+ * it replays log and empties it
+ */
+int log_replay(struct ntfs_inode *ni)
+{
+	int err;
+	struct ntfs_sb_info *sbi = ni->mi.sbi;
+	struct ntfs_log *log;
+
+	struct restart_info rst_info, rst_info2;
+	u64 rec_lsn, ra_lsn, checkpt_lsn = 0, rlsn = 0;
+	struct ATTR_NAME_ENTRY *attr_names = NULL;
+	struct ATTR_NAME_ENTRY *ane;
+	struct RESTART_TABLE *dptbl = NULL;
+	struct RESTART_TABLE *trtbl = NULL;
+	const struct RESTART_TABLE *rt;
+	struct RESTART_TABLE *oatbl = NULL;
+	struct inode *inode;
+	struct OpenAttr *oa;
+	struct ntfs_inode *ni_oe;
+	struct ATTRIB *attr = NULL;
+	u64 size, vcn, undo_next_lsn;
+	CLST rno, lcn, lcn0, len0, clen;
+	void *data;
+	struct NTFS_RESTART *rst = NULL;
+	struct lcb *lcb = NULL;
+	struct OPEN_ATTR_ENRTY *oe;
+	struct TRANSACTION_ENTRY *tr;
+	struct DIR_PAGE_ENTRY *dp;
+	u32 i, bytes_per_attr_entry;
+	u32 l_size = ni->vfs_inode.i_size;
+	u32 orig_file_size = l_size;
+	u32 page_size, vbo, tail, off, dlen;
+	u32 saved_len, rec_len, transact_id;
+	bool use_second_page;
+	struct RESTART_AREA *ra2, *ra = NULL;
+	struct CLIENT_REC *ca, *cr;
+	__le16 client;
+	struct RESTART_HDR *rh;
+	const struct LFS_RECORD_HDR *frh;
+	const struct LOG_REC_HDR *lrh;
+	bool is_mapped;
+	bool is_ro = sb_rdonly(sbi->sb);
+	u64 t64;
+	u16 t16;
+	u32 t32;
+
+	/* Get the size of page. NOTE: To replay we can use default page */
+	page_size = norm_file_page(PAGE_SIZE, &l_size,
+				   PAGE_SIZE >= DefaultLogPageSize &&
+					   PAGE_SIZE <= DefaultLogPageSize * 2);
+	if (!page_size)
+		return -EINVAL;
+
+	log = ntfs_zalloc(sizeof(struct ntfs_log));
+	if (!log)
+		return -ENOMEM;
+
+	log->ni = ni;
+	log->l_size = l_size;
+	log->one_page_buf = ntfs_malloc(page_size);
+
+	if (!log->one_page_buf) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	log->page_size = page_size;
+	log->page_mask = page_size - 1;
+	log->page_bits = blksize_bits(page_size);
+
+	/* Look for a restart area on the disk */
+	err = log_read_rst(log, l_size, true, &rst_info);
+	if (err)
+		goto out;
+
+	if (!rst_info.restart) {
+		if (rst_info.initialized) {
+			/* no restart area but the file is not initialized */
+			err = -EINVAL;
+			goto out;
+		}
+
+		log_init_pg_hdr(log, page_size, page_size, 1, 1);
+		log_create(log, l_size, 0, get_random_int(), false, false);
+
+		log->ra = ra;
+
+		ra = log_create_ra(log);
+		if (!ra) {
+			err = -ENOMEM;
+			goto out;
+		}
+		log->ra = ra;
+		log->init_ra = true;
+
+		goto process_log;
+	}
+
+	/*
+	 * If the restart offset above wasn't zero then we won't
+	 * look for a second restart
+	 */
+	if (rst_info.vbo)
+		goto check_restart_area;
+
+	err = log_read_rst(log, l_size, false, &rst_info2);
+
+	/* Determine which restart area to use */
+	if (!rst_info2.restart || rst_info2.last_lsn <= rst_info.last_lsn)
+		goto use_first_page;
+
+	use_second_page = true;
+
+	if (rst_info.chkdsk_was_run && page_size != rst_info.vbo) {
+		struct RECORD_PAGE_HDR *sp = NULL;
+		bool usa_error;
+
+		if (!read_log_page(log, page_size, &sp, &usa_error) &&
+		    sp->rhdr.sign == NTFS_CHKD_SIGNATURE) {
+			use_second_page = false;
+		}
+		ntfs_free(sp);
+	}
+
+	if (use_second_page) {
+		ntfs_free(rst_info.r_page);
+		memcpy(&rst_info, &rst_info2, sizeof(struct restart_info));
+		rst_info2.r_page = NULL;
+	}
+
+use_first_page:
+	ntfs_free(rst_info2.r_page);
+
+check_restart_area:
+	/* If the restart area is at offset 0, we want to write the second restart area first */
+	log->init_ra = !!rst_info.vbo;
+
+	/* If we have a valid page then grab a pointer to the restart area */
+	ra2 = rst_info.valid_page ?
+		      Add2Ptr(rst_info.r_page,
+			      le16_to_cpu(rst_info.r_page->ra_off)) :
+		      NULL;
+
+	if (rst_info.chkdsk_was_run ||
+	    (ra2 && ra2->client_idx[1] == LFS_NO_CLIENT_LE)) {
+		bool wrapped = false;
+		bool use_multi_page = false;
+		u32 open_log_count;
+
+		/* Do some checks based on whether we have a valid log page */
+		if (!rst_info.valid_page) {
+			open_log_count = get_random_int();
+			goto init_log_instance;
+		}
+		open_log_count = le32_to_cpu(ra2->open_log_count);
+
+		/*
+		 * If the restart page size isn't changing then we want to
+		 * check how much work we need to do
+		 */
+		if (page_size != le32_to_cpu(rst_info.r_page->sys_page_size))
+			goto init_log_instance;
+
+init_log_instance:
+		log_init_pg_hdr(log, page_size, page_size, 1, 1);
+
+		log_create(log, l_size, rst_info.last_lsn, open_log_count,
+			   wrapped, use_multi_page);
+
+		ra = log_create_ra(log);
+		if (!ra) {
+			err = -ENOMEM;
+			goto out;
+		}
+		log->ra = ra;
+
+		/* Put the restart areas and initialize the log file as required */
+		goto process_log;
+	}
+
+	if (!ra2) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	/*
+	 * If the log page or the system page sizes have changed, we can't use the log file
+	 * We must use the system page size instead of the default size
+	 * if there is not a clean shutdown
+	 */
+	t32 = le32_to_cpu(rst_info.r_page->sys_page_size);
+	if (page_size != t32) {
+		l_size = orig_file_size;
+		page_size =
+			norm_file_page(t32, &l_size, t32 == DefaultLogPageSize);
+	}
+
+	if (page_size != t32 ||
+	    page_size != le32_to_cpu(rst_info.r_page->page_size)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	/* If the file size has shrunk then we won't mount it */
+	if (l_size < le64_to_cpu(ra2->l_size)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	log_init_pg_hdr(log, page_size, page_size,
+			le16_to_cpu(rst_info.r_page->major_ver),
+			le16_to_cpu(rst_info.r_page->minor_ver));
+
+	log->l_size = le64_to_cpu(ra2->l_size);
+	log->seq_num_bits = le32_to_cpu(ra2->seq_num_bits);
+	log->file_data_bits = sizeof(u64) * 8 - log->seq_num_bits;
+	log->seq_num_mask = (8 << log->file_data_bits) - 1;
+	log->last_lsn = le64_to_cpu(ra2->current_lsn);
+	log->seq_num = log->last_lsn >> log->file_data_bits;
+	log->ra_off = le16_to_cpu(rst_info.r_page->ra_off);
+	log->restart_size = log->sys_page_size - log->ra_off;
+	log->record_header_len = le16_to_cpu(ra2->rec_hdr_len);
+	log->ra_size = le16_to_cpu(ra2->ra_len);
+	log->data_off = le16_to_cpu(ra2->data_off);
+	log->data_size = log->page_size - log->data_off;
+	log->reserved = log->data_size - log->record_header_len;
+
+	vbo = lsn_to_vbo(log, log->last_lsn);
+
+	if (vbo < log->first_page) {
+		/* This is a pseudo lsn */
+		log->l_flags |= NTFSLOG_NO_LAST_LSN;
+		log->next_page = log->first_page;
+		goto find_oldest;
+	}
+
+	/* Find the end of this log record */
+	off = final_log_off(log, log->last_lsn,
+			    le32_to_cpu(ra2->last_lsn_data_len));
+
+	/* If we wrapped the file then increment the sequence number */
+	if (off <= vbo) {
+		log->seq_num += 1;
+		log->l_flags |= NTFSLOG_WRAPPED;
+	}
+
+	/* Now compute the next log page to use */
+	vbo &= ~log->sys_page_mask;
+	tail = log->page_size - (off & log->page_mask) - 1;
+
+	/* If we can fit another log record on the page, move back a page the log file */
+	if (tail >= log->record_header_len) {
+		log->l_flags |= NTFSLOG_REUSE_TAIL;
+		log->next_page = vbo;
+	} else {
+		log->next_page = next_page_off(log, vbo);
+	}
+
+find_oldest:
+	/* Find the oldest client lsn. Use the last flushed lsn as a starting point */
+	log->oldest_lsn = log->last_lsn;
+	oldest_client_lsn(Add2Ptr(ra2, le16_to_cpu(ra2->client_off)),
+			  ra2->client_idx[1], &log->oldest_lsn);
+	log->oldest_lsn_off = lsn_to_vbo(log, log->oldest_lsn);
+
+	if (log->oldest_lsn_off < log->first_page)
+		log->l_flags |= NTFSLOG_NO_OLDEST_LSN;
+
+	if (!(ra2->flags & RESTART_SINGLE_PAGE_IO))
+		log->l_flags |= NTFSLOG_WRAPPED | NTFSLOG_MULTIPLE_PAGE_IO;
+
+	log->current_openlog_count = le32_to_cpu(ra2->open_log_count);
+	log->total_avail_pages = log->l_size - log->first_page;
+	log->total_avail = log->total_avail_pages >> log->page_bits;
+	log->max_current_avail = log->total_avail * log->reserved;
+	log->total_avail = log->total_avail * log->data_size;
+
+	log->current_avail = current_log_avail(log);
+
+	ra = ntfs_zalloc(log->restart_size);
+	if (!ra) {
+		err = -ENOMEM;
+		goto out;
+	}
+	log->ra = ra;
+
+	t16 = le16_to_cpu(ra2->client_off);
+	if (t16 == offsetof(struct RESTART_AREA, clients)) {
+		memcpy(ra, ra2, log->ra_size);
+	} else {
+		memcpy(ra, ra2, offsetof(struct RESTART_AREA, clients));
+		memcpy(ra->clients, Add2Ptr(ra2, t16),
+		       le16_to_cpu(ra2->ra_len) - t16);
+
+		log->current_openlog_count = get_random_int();
+		ra->open_log_count = cpu_to_le32(log->current_openlog_count);
+		log->ra_size = offsetof(struct RESTART_AREA, clients) +
+			       sizeof(struct CLIENT_REC);
+		ra->client_off =
+			cpu_to_le16(offsetof(struct RESTART_AREA, clients));
+		ra->ra_len = cpu_to_le16(log->ra_size);
+	}
+
+	le32_add_cpu(&ra->open_log_count, 1);
+
+	/* Now we need to walk through looking for the last lsn */
+	err = last_log_lsn(log);
+	if (err)
+		goto out;
+
+	log->current_avail = current_log_avail(log);
+
+	/* Remember which restart area to write first */
+	log->init_ra = rst_info.vbo;
+
+process_log:
+	/* 1.0, 1.1, 2.0 log->major_ver/minor_ver - short values */
+	switch ((log->major_ver << 16) + log->minor_ver) {
+	case 0x10000:
+	case 0x10001:
+	case 0x20000:
+		break;
+	default:
+		ntfs_warn(sbi->sb, "$LogFile version %d.%d is not supported",
+			  log->major_ver, log->minor_ver);
+		err = -EOPNOTSUPP;
+		log->set_dirty = true;
+		goto out;
+	}
+
+	/* One client "NTFS" per logfile */
+	ca = Add2Ptr(ra, le16_to_cpu(ra->client_off));
+
+	for (client = ra->client_idx[1];; client = cr->next_client) {
+		if (client == LFS_NO_CLIENT_LE) {
+			/* Insert "NTFS" client LogFile */
+			client = ra->client_idx[0];
+			if (client == LFS_NO_CLIENT_LE)
+				return -EINVAL;
+
+			t16 = le16_to_cpu(client);
+			cr = ca + t16;
+
+			remove_client(ca, cr, &ra->client_idx[0]);
+
+			cr->restart_lsn = 0;
+			cr->oldest_lsn = cpu_to_le64(log->oldest_lsn);
+			cr->name_bytes = cpu_to_le32(8);
+			cr->name[0] = cpu_to_le16('N');
+			cr->name[1] = cpu_to_le16('T');
+			cr->name[2] = cpu_to_le16('F');
+			cr->name[3] = cpu_to_le16('S');
+
+			add_client(ca, t16, &ra->client_idx[1]);
+			break;
+		}
+
+		cr = ca + le16_to_cpu(client);
+
+		if (cpu_to_le32(8) == cr->name_bytes &&
+		    cpu_to_le16('N') == cr->name[0] &&
+		    cpu_to_le16('T') == cr->name[1] &&
+		    cpu_to_le16('F') == cr->name[2] &&
+		    cpu_to_le16('S') == cr->name[3])
+			break;
+	}
+
+	/* Update the client handle with the client block information */
+	log->client_id.seq_num = cr->seq_num;
+	log->client_id.client_idx = client;
+
+	err = read_rst_area(log, &rst, &ra_lsn);
+	if (err)
+		goto out;
+
+	if (!rst)
+		goto out;
+
+	bytes_per_attr_entry = !rst->major_ver ? 0x2C : 0x28;
+
+	checkpt_lsn = le64_to_cpu(rst->check_point_start);
+	if (!checkpt_lsn)
+		checkpt_lsn = ra_lsn;
+
+	/* Allocate and Read the Transaction Table */
+	if (!rst->transact_table_len)
+		goto check_dirty_page_table;
+
+	t64 = le64_to_cpu(rst->transact_table_lsn);
+	err = read_log_rec_lcb(log, t64, lcb_ctx_prev, &lcb);
+	if (err)
+		goto out;
+
+	lrh = lcb->log_rec;
+	frh = lcb->lrh;
+	rec_len = le32_to_cpu(frh->client_data_len);
+
+	if (!check_log_rec(lrh, rec_len, le32_to_cpu(frh->transact_id),
+			   bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	t16 = le16_to_cpu(lrh->redo_off);
+
+	rt = Add2Ptr(lrh, t16);
+	t32 = rec_len - t16;
+
+	/* Now check that this is a valid restart table */
+	if (!check_rstbl(rt, t32)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	trtbl = ntfs_memdup(rt, t32);
+	if (!trtbl) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	lcb_put(lcb);
+	lcb = NULL;
+
+check_dirty_page_table:
+	/* The next record back should be the Dirty Pages Table */
+	if (!rst->dirty_pages_len)
+		goto check_attribute_names;
+
+	t64 = le64_to_cpu(rst->dirty_pages_table_lsn);
+	err = read_log_rec_lcb(log, t64, lcb_ctx_prev, &lcb);
+	if (err)
+		goto out;
+
+	lrh = lcb->log_rec;
+	frh = lcb->lrh;
+	rec_len = le32_to_cpu(frh->client_data_len);
+
+	if (!check_log_rec(lrh, rec_len, le32_to_cpu(frh->transact_id),
+			   bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	t16 = le16_to_cpu(lrh->redo_off);
+
+	rt = Add2Ptr(lrh, t16);
+	t32 = rec_len - t16;
+
+	/* Now check that this is a valid restart table */
+	if (!check_rstbl(rt, t32)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	dptbl = ntfs_memdup(rt, t32);
+	if (!dptbl) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* Convert Ra version '0' into version '1' */
+	if (rst->major_ver)
+		goto end_conv_1;
+
+	dp = NULL;
+	while ((dp = enum_rstbl(dptbl, dp))) {
+		struct DIR_PAGE_ENTRY_32 *dp0 = (struct DIR_PAGE_ENTRY_32 *)dp;
+		// NOTE: Danger. Check for of boundary
+		memmove(&dp->vcn, &dp0->vcn_low,
+			2 * sizeof(u64) +
+				le32_to_cpu(dp->lcns_follow) * sizeof(u64));
+	}
+
+end_conv_1:
+	lcb_put(lcb);
+	lcb = NULL;
+
+	/* Go through the table and remove the duplicates, remembering the oldest lsn values */
+	if (sbi->cluster_size <= log->page_size)
+		goto trace_dp_table;
+
+	dp = NULL;
+	while ((dp = enum_rstbl(dptbl, dp))) {
+		struct DIR_PAGE_ENTRY *next = dp;
+
+		while ((next = enum_rstbl(dptbl, next))) {
+			if (next->target_attr == dp->target_attr &&
+			    next->vcn == dp->vcn) {
+				if (le64_to_cpu(next->oldest_lsn) <
+				    le64_to_cpu(dp->oldest_lsn)) {
+					dp->oldest_lsn = next->oldest_lsn;
+				}
+
+				free_rsttbl_idx(dptbl, PtrOffset(dptbl, next));
+			}
+		}
+	}
+trace_dp_table:
+check_attribute_names:
+	/* The next record should be the Attribute Names */
+	if (!rst->attr_names_len)
+		goto check_attr_table;
+
+	t64 = le64_to_cpu(rst->attr_names_lsn);
+	err = read_log_rec_lcb(log, t64, lcb_ctx_prev, &lcb);
+	if (err)
+		goto out;
+
+	lrh = lcb->log_rec;
+	frh = lcb->lrh;
+	rec_len = le32_to_cpu(frh->client_data_len);
+
+	if (!check_log_rec(lrh, rec_len, le32_to_cpu(frh->transact_id),
+			   bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	t32 = lrh_length(lrh);
+	rec_len -= t32;
+
+	attr_names = ntfs_memdup(Add2Ptr(lrh, t32), rec_len);
+
+	lcb_put(lcb);
+	lcb = NULL;
+
+check_attr_table:
+	/* The next record should be the attribute Table */
+	if (!rst->open_attr_len)
+		goto check_attribute_names2;
+
+	t64 = le64_to_cpu(rst->open_attr_table_lsn);
+	err = read_log_rec_lcb(log, t64, lcb_ctx_prev, &lcb);
+	if (err)
+		goto out;
+
+	lrh = lcb->log_rec;
+	frh = lcb->lrh;
+	rec_len = le32_to_cpu(frh->client_data_len);
+
+	if (!check_log_rec(lrh, rec_len, le32_to_cpu(frh->transact_id),
+			   bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	t16 = le16_to_cpu(lrh->redo_off);
+
+	rt = Add2Ptr(lrh, t16);
+	t32 = rec_len - t16;
+
+	if (!check_rstbl(rt, t32)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	oatbl = ntfs_memdup(rt, t32);
+	if (!oatbl) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	log->open_attr_tbl = oatbl;
+
+	/* Clear all of the Attr pointers */
+	oe = NULL;
+	while ((oe = enum_rstbl(oatbl, oe))) {
+		if (!rst->major_ver) {
+			struct OPEN_ATTR_ENRTY_32 oe0;
+
+			/* Really 'oe' points to OPEN_ATTR_ENRTY_32 */
+			memcpy(&oe0, oe, SIZEOF_OPENATTRIBUTEENTRY0);
+
+			oe->bytes_per_index = oe0.bytes_per_index;
+			oe->type = oe0.type;
+			oe->is_dirty_pages = oe0.is_dirty_pages;
+			oe->name_len = 0;
+			oe->ref = oe0.ref;
+			oe->open_record_lsn = oe0.open_record_lsn;
+		}
+
+		oe->is_attr_name = 0;
+		oe->ptr = NULL;
+	}
+
+	lcb_put(lcb);
+	lcb = NULL;
+
+check_attribute_names2:
+	if (!rst->attr_names_len)
+		goto trace_attribute_table;
+
+	ane = attr_names;
+	if (!oatbl)
+		goto trace_attribute_table;
+	while (ane->off) {
+		/* TODO: Clear table on exit! */
+		oe = Add2Ptr(oatbl, le16_to_cpu(ane->off));
+		t16 = le16_to_cpu(ane->name_bytes);
+		oe->name_len = t16 / sizeof(short);
+		oe->ptr = ane->name;
+		oe->is_attr_name = 2;
+		ane = Add2Ptr(ane, sizeof(struct ATTR_NAME_ENTRY) + t16);
+	}
+
+trace_attribute_table:
+	/*
+	 * If the checkpt_lsn is zero, then this is a freshly
+	 * formatted disk and we have no work to do
+	 */
+	if (!checkpt_lsn) {
+		err = 0;
+		goto out;
+	}
+
+	if (!oatbl) {
+		oatbl = init_rsttbl(bytes_per_attr_entry, 8);
+		if (!oatbl) {
+			err = -ENOMEM;
+			goto out;
+		}
+	}
+
+	log->open_attr_tbl = oatbl;
+
+	/* Start the analysis pass from the Checkpoint lsn. */
+	rec_lsn = checkpt_lsn;
+
+	/* Read the first lsn */
+	err = read_log_rec_lcb(log, checkpt_lsn, lcb_ctx_next, &lcb);
+	if (err)
+		goto out;
+
+	/* Loop to read all subsequent records to the end of the log file */
+next_log_record_analyze:
+	err = read_next_log_rec(log, lcb, &rec_lsn);
+	if (err)
+		goto out;
+
+	if (!rec_lsn)
+		goto end_log_records_enumerate;
+
+	frh = lcb->lrh;
+	transact_id = le32_to_cpu(frh->transact_id);
+	rec_len = le32_to_cpu(frh->client_data_len);
+	lrh = lcb->log_rec;
+
+	if (!check_log_rec(lrh, rec_len, transact_id, bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	/*
+	 * The first lsn after the previous lsn remembered
+	 * the checkpoint is the first candidate for the rlsn
+	 */
+	if (!rlsn)
+		rlsn = rec_lsn;
+
+	if (LfsClientRecord != frh->record_type)
+		goto next_log_record_analyze;
+
+	/*
+	 * Now update the Transaction Table for this transaction
+	 * If there is no entry present or it is unallocated we allocate the entry
+	 */
+	if (!trtbl) {
+		trtbl = init_rsttbl(sizeof(struct TRANSACTION_ENTRY),
+				    INITIAL_NUMBER_TRANSACTIONS);
+		if (!trtbl) {
+			err = -ENOMEM;
+			goto out;
+		}
+	}
+
+	tr = Add2Ptr(trtbl, transact_id);
+
+	if (transact_id >= bytes_per_rt(trtbl) ||
+	    tr->next != RESTART_ENTRY_ALLOCATED_LE) {
+		tr = alloc_rsttbl_from_idx(&trtbl, transact_id);
+		if (!tr) {
+			err = -ENOMEM;
+			goto out;
+		}
+		tr->transact_state = TransactionActive;
+		tr->first_lsn = cpu_to_le64(rec_lsn);
+	}
+
+	tr->prev_lsn = tr->undo_next_lsn = cpu_to_le64(rec_lsn);
+
+	/*
+	 * If this is a compensation log record, then change
+	 * the undo_next_lsn to be the undo_next_lsn of this record
+	 */
+	if (lrh->undo_op == cpu_to_le16(CompensationLogRecord))
+		tr->undo_next_lsn = frh->client_undo_next_lsn;
+
+	/* Dispatch to handle log record depending on type */
+	switch (le16_to_cpu(lrh->redo_op)) {
+	case InitializeFileRecordSegment:
+	case DeallocateFileRecordSegment:
+	case WriteEndOfFileRecordSegment:
+	case CreateAttribute:
+	case DeleteAttribute:
+	case UpdateResidentValue:
+	case UpdateNonresidentValue:
+	case UpdateMappingPairs:
+	case SetNewAttributeSizes:
+	case AddIndexEntryRoot:
+	case DeleteIndexEntryRoot:
+	case AddIndexEntryAllocation:
+	case DeleteIndexEntryAllocation:
+	case WriteEndOfIndexBuffer:
+	case SetIndexEntryVcnRoot:
+	case SetIndexEntryVcnAllocation:
+	case UpdateFileNameRoot:
+	case UpdateFileNameAllocation:
+	case SetBitsInNonresidentBitMap:
+	case ClearBitsInNonresidentBitMap:
+	case UpdateRecordDataRoot:
+	case UpdateRecordDataAllocation:
+	case ZeroEndOfFileRecord:
+		t16 = le16_to_cpu(lrh->target_attr);
+		t64 = le64_to_cpu(lrh->target_vcn);
+		dp = find_dp(dptbl, t16, t64);
+
+		if (dp)
+			goto copy_lcns;
+
+		/*
+		 * Calculate the number of clusters per page the system
+		 * which wrote the checkpoint, possibly creating the table
+		 */
+		if (dptbl) {
+			t32 = 1 + (le16_to_cpu(dptbl->size) -
+				   sizeof(struct DIR_PAGE_ENTRY)) /
+					  sizeof(u64);
+		} else {
+			t32 = log->clst_per_page;
+			ntfs_free(dptbl);
+			dptbl = init_rsttbl(sizeof(struct DIR_PAGE_ENTRY) +
+						    (t32 - 1) * sizeof(u64),
+					    32);
+			if (!dptbl) {
+				err = -ENOMEM;
+				goto out;
+			}
+		}
+
+		dp = alloc_rsttbl_idx(&dptbl);
+		dp->target_attr = cpu_to_le32(t16);
+		dp->transfer_len = cpu_to_le32(t32 << sbi->cluster_bits);
+		dp->lcns_follow = cpu_to_le32(t32);
+		dp->vcn = cpu_to_le64(t64 & ~((u64)t32 - 1));
+		dp->oldest_lsn = cpu_to_le64(rec_lsn);
+
+copy_lcns:
+		/*
+		 * Copy the Lcns from the log record into the Dirty Page Entry
+		 * TODO: for different page size support, must somehow make
+		 * whole routine a loop, case Lcns do not fit below
+		 */
+		t16 = le16_to_cpu(lrh->lcns_follow);
+		for (i = 0; i < t16; i++) {
+			size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) -
+					    le64_to_cpu(dp->vcn));
+			dp->page_lcns[j + i] = lrh->page_lcns[i];
+		}
+
+		goto next_log_record_analyze;
+
+	case DeleteDirtyClusters: {
+		u32 range_count =
+			le16_to_cpu(lrh->redo_len) / sizeof(struct LCN_RANGE);
+		const struct LCN_RANGE *r =
+			Add2Ptr(lrh, le16_to_cpu(lrh->redo_off));
+
+		/* Loop through all of the Lcn ranges this log record */
+		for (i = 0; i < range_count; i++, r++) {
+			u64 lcn0 = le64_to_cpu(r->lcn);
+			u64 lcn_e = lcn0 + le64_to_cpu(r->len) - 1;
+
+			dp = NULL;
+			while ((dp = enum_rstbl(dptbl, dp))) {
+				u32 j;
+
+				t32 = le32_to_cpu(dp->lcns_follow);
+				for (j = 0; j < t32; j++) {
+					t64 = le64_to_cpu(dp->page_lcns[j]);
+					if (t64 >= lcn0 && t64 <= lcn_e)
+						dp->page_lcns[j] = 0;
+				}
+			}
+		}
+		goto next_log_record_analyze;
+		;
+	}
+
+	case OpenNonresidentAttribute:
+		t16 = le16_to_cpu(lrh->target_attr);
+		if (t16 >= bytes_per_rt(oatbl)) {
+			/*
+			 * Compute how big the table needs to be.
+			 * Add 10 extra entries for some cushion
+			 */
+			u32 new_e = t16 / le16_to_cpu(oatbl->size);
+
+			new_e += 10 - le16_to_cpu(oatbl->used);
+
+			oatbl = extend_rsttbl(oatbl, new_e, ~0u);
+			log->open_attr_tbl = oatbl;
+			if (!oatbl) {
+				err = -ENOMEM;
+				goto out;
+			}
+		}
+
+		/* Point to the entry being opened */
+		oe = alloc_rsttbl_from_idx(&oatbl, t16);
+		log->open_attr_tbl = oatbl;
+		if (!oe) {
+			err = -ENOMEM;
+			goto out;
+		}
+
+		/* Initialize this entry from the log record */
+		t16 = le16_to_cpu(lrh->redo_off);
+		if (!rst->major_ver) {
+			/* Convert version '0' into version '1' */
+			struct OPEN_ATTR_ENRTY_32 *oe0 = Add2Ptr(lrh, t16);
+
+			oe->bytes_per_index = oe0->bytes_per_index;
+			oe->type = oe0->type;
+			oe->is_dirty_pages = oe0->is_dirty_pages;
+			oe->name_len = 0; //oe0.name_len;
+			oe->ref = oe0->ref;
+			oe->open_record_lsn = oe0->open_record_lsn;
+		} else {
+			memcpy(oe, Add2Ptr(lrh, t16), bytes_per_attr_entry);
+		}
+
+		t16 = le16_to_cpu(lrh->undo_len);
+		if (t16) {
+			oe->ptr = ntfs_malloc(t16);
+			if (!oe->ptr) {
+				err = -ENOMEM;
+				goto out;
+			}
+			oe->name_len = t16 / sizeof(short);
+			memcpy(oe->ptr,
+			       Add2Ptr(lrh, le16_to_cpu(lrh->undo_off)), t16);
+			oe->is_attr_name = 1;
+		} else {
+			oe->ptr = NULL;
+			oe->is_attr_name = 0;
+		}
+
+		goto next_log_record_analyze;
+
+	case HotFix:
+		t16 = le16_to_cpu(lrh->target_attr);
+		t64 = le64_to_cpu(lrh->target_vcn);
+		dp = find_dp(dptbl, t16, t64);
+		if (dp) {
+			size_t j = le64_to_cpu(lrh->target_vcn) -
+				   le64_to_cpu(dp->vcn);
+			if (dp->page_lcns[j])
+				dp->page_lcns[j] = lrh->page_lcns[0];
+		}
+		goto next_log_record_analyze;
+
+	case EndTopLevelAction:
+		tr = Add2Ptr(trtbl, transact_id);
+		tr->prev_lsn = cpu_to_le64(rec_lsn);
+		tr->undo_next_lsn = frh->client_undo_next_lsn;
+		goto next_log_record_analyze;
+
+	case PrepareTransaction:
+		tr = Add2Ptr(trtbl, transact_id);
+		tr->transact_state = TransactionPrepared;
+		goto next_log_record_analyze;
+
+	case CommitTransaction:
+		tr = Add2Ptr(trtbl, transact_id);
+		tr->transact_state = TransactionCommitted;
+		goto next_log_record_analyze;
+
+	case ForgetTransaction:
+		free_rsttbl_idx(trtbl, transact_id);
+		goto next_log_record_analyze;
+
+	case Noop:
+	case OpenAttributeTableDump:
+	case AttributeNamesDump:
+	case DirtyPageTableDump:
+	case TransactionTableDump:
+		/* The following cases require no action the Analysis Pass */
+		goto next_log_record_analyze;
+
+	default:
+		/*
+		 * All codes will be explicitly handled.
+		 * If we see a code we do not expect, then we are trouble
+		 */
+		goto next_log_record_analyze;
+	}
+
+end_log_records_enumerate:
+	lcb_put(lcb);
+	lcb = NULL;
+
+	/*
+	 * Scan the Dirty Page Table and Transaction Table for
+	 * the lowest lsn, and return it as the Redo lsn
+	 */
+	dp = NULL;
+	while ((dp = enum_rstbl(dptbl, dp))) {
+		t64 = le64_to_cpu(dp->oldest_lsn);
+		if (t64 && t64 < rlsn)
+			rlsn = t64;
+	}
+
+	tr = NULL;
+	while ((tr = enum_rstbl(trtbl, tr))) {
+		t64 = le64_to_cpu(tr->first_lsn);
+		if (t64 && t64 < rlsn)
+			rlsn = t64;
+	}
+
+	/* Only proceed if the Dirty Page Table or Transaction table are not empty */
+	if ((!dptbl || !dptbl->total) && (!trtbl || !trtbl->total))
+		goto end_reply;
+
+	sbi->flags |= NTFS_FLAGS_NEED_REPLAY;
+	if (is_ro)
+		goto out;
+
+	/* Reopen all of the attributes with dirty pages */
+	oe = NULL;
+next_open_attribute:
+
+	oe = enum_rstbl(oatbl, oe);
+	if (!oe) {
+		err = 0;
+		dp = NULL;
+		goto next_dirty_page;
+	}
+
+	oa = ntfs_zalloc(sizeof(struct OpenAttr));
+	if (!oa) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	inode = ntfs_iget5(sbi->sb, &oe->ref, NULL);
+	if (IS_ERR(inode))
+		goto fake_attr;
+
+	if (is_bad_inode(inode)) {
+		iput(inode);
+fake_attr:
+		if (oa->ni) {
+			iput(&oa->ni->vfs_inode);
+			oa->ni = NULL;
+		}
+
+		attr = attr_create_nonres_log(sbi, oe->type, 0, oe->ptr,
+					      oe->name_len, 0);
+		if (!attr) {
+			ntfs_free(oa);
+			err = -ENOMEM;
+			goto out;
+		}
+		oa->attr = attr;
+		oa->run1 = &oa->run0;
+		goto final_oe;
+	}
+
+	ni_oe = ntfs_i(inode);
+	oa->ni = ni_oe;
+
+	attr = ni_find_attr(ni_oe, NULL, NULL, oe->type, oe->ptr, oe->name_len,
+			    NULL, NULL);
+
+	if (!attr)
+		goto fake_attr;
+
+	t32 = le32_to_cpu(attr->size);
+	oa->attr = ntfs_memdup(attr, t32);
+	if (!oa->attr)
+		goto fake_attr;
+
+	if (!S_ISDIR(inode->i_mode)) {
+		if (attr->type == ATTR_DATA && !attr->name_len) {
+			oa->run1 = &ni_oe->file.run;
+			goto final_oe;
+		}
+	} else {
+		if (attr->type == ATTR_ALLOC &&
+		    attr->name_len == ARRAY_SIZE(I30_NAME) &&
+		    !memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) {
+			oa->run1 = &ni_oe->dir.alloc_run;
+			goto final_oe;
+		}
+	}
+
+	if (attr->non_res) {
+		u16 roff = le16_to_cpu(attr->nres.run_off);
+		CLST svcn = le64_to_cpu(attr->nres.svcn);
+
+		err = run_unpack(&oa->run0, sbi, inode->i_ino, svcn,
+				 le64_to_cpu(attr->nres.evcn), svcn,
+				 Add2Ptr(attr, roff), t32 - roff);
+		if (err < 0) {
+			ntfs_free(oa->attr);
+			oa->attr = NULL;
+			goto fake_attr;
+		}
+		err = 0;
+	}
+	oa->run1 = &oa->run0;
+	attr = oa->attr;
+
+final_oe:
+	if (oe->is_attr_name == 1)
+		ntfs_free(oe->ptr);
+	oe->is_attr_name = 0;
+	oe->ptr = oa;
+	oe->name_len = attr->name_len;
+
+	goto next_open_attribute;
+
+	/*
+	 * Now loop through the dirty page table to extract all of the Vcn/Lcn
+	 * Mapping that we have, and insert it into the appropriate run
+	 */
+next_dirty_page:
+	dp = enum_rstbl(dptbl, dp);
+	if (!dp)
+		goto do_redo_1;
+
+	oe = Add2Ptr(oatbl, le32_to_cpu(dp->target_attr));
+
+	if (oe->next != RESTART_ENTRY_ALLOCATED_LE)
+		goto next_dirty_page;
+
+	oa = oe->ptr;
+	if (!oa)
+		goto next_dirty_page;
+
+	i = -1;
+next_dirty_page_vcn:
+	i += 1;
+	if (i >= le32_to_cpu(dp->lcns_follow))
+		goto next_dirty_page;
+
+	vcn = le64_to_cpu(dp->vcn) + i;
+	size = (vcn + 1) << sbi->cluster_bits;
+
+	if (!dp->page_lcns[i])
+		goto next_dirty_page_vcn;
+
+	rno = ino_get(&oe->ref);
+	if (rno <= MFT_REC_MIRR &&
+	    size < (MFT_REC_VOL + 1) * sbi->record_size &&
+	    oe->type == ATTR_DATA) {
+		goto next_dirty_page_vcn;
+	}
+
+	lcn = le64_to_cpu(dp->page_lcns[i]);
+
+	if ((!run_lookup_entry(oa->run1, vcn, &lcn0, &len0, NULL) ||
+	     lcn0 != lcn) &&
+	    !run_add_entry(oa->run1, vcn, lcn, 1, false)) {
+		err = -ENOMEM;
+		goto out;
+	}
+	attr = oa->attr;
+	t64 = le64_to_cpu(attr->nres.alloc_size);
+	if (size > t64) {
+		attr->nres.valid_size = attr->nres.data_size =
+			attr->nres.alloc_size = cpu_to_le64(size);
+	}
+	goto next_dirty_page_vcn;
+
+do_redo_1:
+	/*
+	 * Perform the Redo Pass, to restore all of the dirty pages to the same
+	 * contents that they had immediately before the crash
+	 * If the dirty page table is empty, then we can skip the entire Redo Pass
+	 */
+	if (!dptbl || !dptbl->total)
+		goto do_undo_action;
+
+	rec_lsn = rlsn;
+
+	/*
+	 * Read the record at the Redo lsn, before falling
+	 * into common code to handle each record
+	 */
+	err = read_log_rec_lcb(log, rlsn, lcb_ctx_next, &lcb);
+	if (err)
+		goto out;
+
+	/*
+	 * Now loop to read all of our log records forwards,
+	 * until we hit the end of the file, cleaning up at the end
+	 */
+do_action_next:
+	frh = lcb->lrh;
+
+	if (LfsClientRecord != frh->record_type)
+		goto read_next_log_do_action;
+
+	transact_id = le32_to_cpu(frh->transact_id);
+	rec_len = le32_to_cpu(frh->client_data_len);
+	lrh = lcb->log_rec;
+
+	if (!check_log_rec(lrh, rec_len, transact_id, bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	/* Ignore log records that do not update pages */
+	if (lrh->lcns_follow)
+		goto find_dirty_page;
+
+	goto read_next_log_do_action;
+
+find_dirty_page:
+	t16 = le16_to_cpu(lrh->target_attr);
+	t64 = le64_to_cpu(lrh->target_vcn);
+	dp = find_dp(dptbl, t16, t64);
+
+	if (!dp)
+		goto read_next_log_do_action;
+
+	if (rec_lsn < le64_to_cpu(dp->oldest_lsn))
+		goto read_next_log_do_action;
+
+	t16 = le16_to_cpu(lrh->target_attr);
+	if (t16 >= bytes_per_rt(oatbl)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	oe = Add2Ptr(oatbl, t16);
+
+	if (oe->next != RESTART_ENTRY_ALLOCATED_LE) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	oa = oe->ptr;
+
+	if (!oa) {
+		err = -EINVAL;
+		goto out;
+	}
+	attr = oa->attr;
+
+	vcn = le64_to_cpu(lrh->target_vcn);
+
+	if (!run_lookup_entry(oa->run1, vcn, &lcn, NULL, NULL) ||
+	    lcn == SPARSE_LCN) {
+		goto read_next_log_do_action;
+	}
+
+	/* Point to the Redo data and get its length */
+	data = Add2Ptr(lrh, le16_to_cpu(lrh->redo_off));
+	dlen = le16_to_cpu(lrh->redo_len);
+
+	/* Shorten length by any Lcns which were deleted */
+	saved_len = dlen;
+
+	for (i = le16_to_cpu(lrh->lcns_follow); i; i--) {
+		size_t j;
+		u32 alen, voff;
+
+		voff = le16_to_cpu(lrh->record_off) +
+		       le16_to_cpu(lrh->attr_off);
+		voff += le16_to_cpu(lrh->cluster_off) << SECTOR_SHIFT;
+
+		/* If the Vcn question is allocated, we can just get out.*/
+		j = le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn);
+		if (dp->page_lcns[j + i - 1])
+			break;
+
+		if (!saved_len)
+			saved_len = 1;
+
+		/*
+		 * Calculate the allocated space left relative to the
+		 * log record Vcn, after removing this unallocated Vcn
+		 */
+		alen = (i - 1) << sbi->cluster_bits;
+
+		/*
+		 * If the update described this log record goes beyond
+		 * the allocated space, then we will have to reduce the length
+		 */
+		if (voff >= alen)
+			dlen = 0;
+		else if (voff + dlen > alen)
+			dlen = alen - voff;
+	}
+
+	/* If the resulting dlen from above is now zero, we can skip this log record */
+	if (!dlen && saved_len)
+		goto read_next_log_do_action;
+
+	t16 = le16_to_cpu(lrh->redo_op);
+	if (can_skip_action(t16))
+		goto read_next_log_do_action;
+
+	/* Apply the Redo operation a common routine */
+	err = do_action(log, oe, lrh, t16, data, dlen, rec_len, &rec_lsn);
+	if (err)
+		goto out;
+
+	/* Keep reading and looping back until end of file */
+read_next_log_do_action:
+	err = read_next_log_rec(log, lcb, &rec_lsn);
+	if (!err && rec_lsn)
+		goto do_action_next;
+
+	lcb_put(lcb);
+	lcb = NULL;
+
+do_undo_action:
+	/* Scan Transaction Table */
+	tr = NULL;
+transaction_table_next:
+	tr = enum_rstbl(trtbl, tr);
+	if (!tr)
+		goto undo_action_done;
+
+	if (TransactionActive != tr->transact_state || !tr->undo_next_lsn) {
+		free_rsttbl_idx(trtbl, PtrOffset(trtbl, tr));
+		goto transaction_table_next;
+	}
+
+	log->transaction_id = PtrOffset(trtbl, tr);
+	undo_next_lsn = le64_to_cpu(tr->undo_next_lsn);
+
+	/*
+	 * We only have to do anything if the transaction has
+	 * something its undo_next_lsn field
+	 */
+	if (!undo_next_lsn)
+		goto commit_undo;
+
+	/* Read the first record to be undone by this transaction */
+	err = read_log_rec_lcb(log, undo_next_lsn, lcb_ctx_undo_next, &lcb);
+	if (err)
+		goto out;
+
+	/*
+	 * Now loop to read all of our log records forwards,
+	 * until we hit the end of the file, cleaning up at the end
+	 */
+undo_action_next:
+
+	lrh = lcb->log_rec;
+	frh = lcb->lrh;
+	transact_id = le32_to_cpu(frh->transact_id);
+	rec_len = le32_to_cpu(frh->client_data_len);
+
+	if (!check_log_rec(lrh, rec_len, transact_id, bytes_per_attr_entry)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (lrh->undo_op == cpu_to_le16(Noop))
+		goto read_next_log_undo_action;
+
+	oe = Add2Ptr(oatbl, le16_to_cpu(lrh->target_attr));
+	oa = oe->ptr;
+
+	t16 = le16_to_cpu(lrh->lcns_follow);
+	if (!t16)
+		goto add_allocated_vcns;
+
+	is_mapped = run_lookup_entry(oa->run1, le64_to_cpu(lrh->target_vcn),
+				     &lcn, &clen, NULL);
+
+	/*
+	 * If the mapping isn't already the table or the  mapping
+	 * corresponds to a hole the mapping, we need to make sure
+	 * there is no partial page already memory
+	 */
+	if (is_mapped && lcn != SPARSE_LCN && clen >= t16)
+		goto add_allocated_vcns;
+
+	vcn = le64_to_cpu(lrh->target_vcn);
+	vcn &= ~(log->clst_per_page - 1);
+
+add_allocated_vcns:
+	for (i = 0, vcn = le64_to_cpu(lrh->target_vcn),
+	    size = (vcn + 1) << sbi->cluster_bits;
+	     i < t16; i++, vcn += 1, size += sbi->cluster_size) {
+		attr = oa->attr;
+		if (!attr->non_res) {
+			if (size > le32_to_cpu(attr->res.data_size))
+				attr->res.data_size = cpu_to_le32(size);
+		} else {
+			if (size > le64_to_cpu(attr->nres.data_size))
+				attr->nres.valid_size = attr->nres.data_size =
+					attr->nres.alloc_size =
+						cpu_to_le64(size);
+		}
+	}
+
+	t16 = le16_to_cpu(lrh->undo_op);
+	if (can_skip_action(t16))
+		goto read_next_log_undo_action;
+
+	/* Point to the Redo data and get its length */
+	data = Add2Ptr(lrh, le16_to_cpu(lrh->undo_off));
+	dlen = le16_to_cpu(lrh->undo_len);
+
+	/* it is time to apply the undo action */
+	err = do_action(log, oe, lrh, t16, data, dlen, rec_len, NULL);
+
+read_next_log_undo_action:
+	/*
+	 * Keep reading and looping back until we have read the
+	 * last record for this transaction
+	 */
+	err = read_next_log_rec(log, lcb, &rec_lsn);
+	if (err)
+		goto out;
+
+	if (rec_lsn)
+		goto undo_action_next;
+
+commit_undo:
+	free_rsttbl_idx(trtbl, log->transaction_id);
+
+	log->transaction_id = 0;
+
+	goto transaction_table_next;
+
+undo_action_done:
+
+	ntfs_update_mftmirr(sbi, 0);
+
+	sbi->flags &= ~NTFS_FLAGS_NEED_REPLAY;
+
+end_reply:
+
+	err = 0;
+	if (is_ro)
+		goto out;
+
+	rh = ntfs_zalloc(log->page_size);
+	if (!rh) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	rh->rhdr.sign = NTFS_RSTR_SIGNATURE;
+	rh->rhdr.fix_off = cpu_to_le16(offsetof(struct RESTART_HDR, fixups));
+	t16 = (log->page_size >> SECTOR_SHIFT) + 1;
+	rh->rhdr.fix_num = cpu_to_le16(t16);
+	rh->sys_page_size = cpu_to_le32(log->page_size);
+	rh->page_size = cpu_to_le32(log->page_size);
+
+	t16 = QuadAlign(offsetof(struct RESTART_HDR, fixups) +
+			sizeof(short) * t16);
+	rh->ra_off = cpu_to_le16(t16);
+	rh->minor_ver = cpu_to_le16(1); // 0x1A:
+	rh->major_ver = cpu_to_le16(1); // 0x1C:
+
+	ra2 = Add2Ptr(rh, t16);
+	memcpy(ra2, ra, sizeof(struct RESTART_AREA));
+
+	ra2->client_idx[0] = 0;
+	ra2->client_idx[1] = LFS_NO_CLIENT_LE;
+	ra2->flags = cpu_to_le16(2);
+
+	le32_add_cpu(&ra2->open_log_count, 1);
+
+	ntfs_fix_pre_write(&rh->rhdr, log->page_size);
+
+	err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rh, log->page_size);
+	if (!err)
+		err = ntfs_sb_write_run(sbi, &log->ni->file.run, log->page_size,
+					rh, log->page_size);
+
+	ntfs_free(rh);
+	if (err)
+		goto out;
+
+out:
+	ntfs_free(rst);
+	if (lcb)
+		lcb_put(lcb);
+
+	/* Scan the Open Attribute Table to close all of the open attributes */
+	oe = NULL;
+	while ((oe = enum_rstbl(oatbl, oe))) {
+		rno = ino_get(&oe->ref);
+
+		if (oe->is_attr_name == 1) {
+			ntfs_free(oe->ptr);
+			oe->ptr = NULL;
+			continue;
+		}
+
+		if (oe->is_attr_name)
+			continue;
+
+		oa = oe->ptr;
+		if (!oa)
+			continue;
+
+		run_close(&oa->run0);
+		ntfs_free(oa->attr);
+		if (oa->ni)
+			iput(&oa->ni->vfs_inode);
+		ntfs_free(oa);
+	}
+
+	ntfs_free(trtbl);
+	ntfs_free(oatbl);
+	ntfs_free(dptbl);
+	ntfs_free(attr_names);
+	ntfs_free(rst_info.r_page);
+
+	ntfs_free(ra);
+	ntfs_free(log->one_page_buf);
+
+	if (err)
+		sbi->flags |= NTFS_FLAGS_NEED_REPLAY;
+
+	if (err == -EROFS)
+		err = 0;
+	else if (log->set_dirty)
+		ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
+
+	ntfs_free(log);
+
+	return err;
+}
-- 
2.25.4