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7832e12349
Metafile /proc/fs/ntfs3/<dev>/label allows to read/write current ntfs label. Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
2679 lines
57 KiB
C
2679 lines
57 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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*
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* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
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*
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*/
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#include <linux/blkdev.h>
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#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/nls.h>
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#include "debug.h"
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#include "ntfs.h"
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#include "ntfs_fs.h"
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// clang-format off
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const struct cpu_str NAME_MFT = {
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4, 0, { '$', 'M', 'F', 'T' },
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};
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const struct cpu_str NAME_MIRROR = {
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8, 0, { '$', 'M', 'F', 'T', 'M', 'i', 'r', 'r' },
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};
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const struct cpu_str NAME_LOGFILE = {
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8, 0, { '$', 'L', 'o', 'g', 'F', 'i', 'l', 'e' },
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};
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const struct cpu_str NAME_VOLUME = {
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7, 0, { '$', 'V', 'o', 'l', 'u', 'm', 'e' },
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};
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const struct cpu_str NAME_ATTRDEF = {
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8, 0, { '$', 'A', 't', 't', 'r', 'D', 'e', 'f' },
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};
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const struct cpu_str NAME_ROOT = {
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1, 0, { '.' },
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};
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const struct cpu_str NAME_BITMAP = {
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7, 0, { '$', 'B', 'i', 't', 'm', 'a', 'p' },
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};
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const struct cpu_str NAME_BOOT = {
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5, 0, { '$', 'B', 'o', 'o', 't' },
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};
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const struct cpu_str NAME_BADCLUS = {
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8, 0, { '$', 'B', 'a', 'd', 'C', 'l', 'u', 's' },
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};
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const struct cpu_str NAME_QUOTA = {
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6, 0, { '$', 'Q', 'u', 'o', 't', 'a' },
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};
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const struct cpu_str NAME_SECURE = {
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7, 0, { '$', 'S', 'e', 'c', 'u', 'r', 'e' },
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};
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const struct cpu_str NAME_UPCASE = {
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7, 0, { '$', 'U', 'p', 'C', 'a', 's', 'e' },
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};
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const struct cpu_str NAME_EXTEND = {
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7, 0, { '$', 'E', 'x', 't', 'e', 'n', 'd' },
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};
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const struct cpu_str NAME_OBJID = {
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6, 0, { '$', 'O', 'b', 'j', 'I', 'd' },
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};
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const struct cpu_str NAME_REPARSE = {
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8, 0, { '$', 'R', 'e', 'p', 'a', 'r', 's', 'e' },
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};
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const struct cpu_str NAME_USNJRNL = {
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8, 0, { '$', 'U', 's', 'n', 'J', 'r', 'n', 'l' },
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};
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const __le16 BAD_NAME[4] = {
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cpu_to_le16('$'), cpu_to_le16('B'), cpu_to_le16('a'), cpu_to_le16('d'),
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};
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const __le16 I30_NAME[4] = {
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cpu_to_le16('$'), cpu_to_le16('I'), cpu_to_le16('3'), cpu_to_le16('0'),
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};
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const __le16 SII_NAME[4] = {
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cpu_to_le16('$'), cpu_to_le16('S'), cpu_to_le16('I'), cpu_to_le16('I'),
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};
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const __le16 SDH_NAME[4] = {
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cpu_to_le16('$'), cpu_to_le16('S'), cpu_to_le16('D'), cpu_to_le16('H'),
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};
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const __le16 SDS_NAME[4] = {
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cpu_to_le16('$'), cpu_to_le16('S'), cpu_to_le16('D'), cpu_to_le16('S'),
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};
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const __le16 SO_NAME[2] = {
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cpu_to_le16('$'), cpu_to_le16('O'),
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};
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const __le16 SQ_NAME[2] = {
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cpu_to_le16('$'), cpu_to_le16('Q'),
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};
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const __le16 SR_NAME[2] = {
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cpu_to_le16('$'), cpu_to_le16('R'),
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};
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#ifdef CONFIG_NTFS3_LZX_XPRESS
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const __le16 WOF_NAME[17] = {
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cpu_to_le16('W'), cpu_to_le16('o'), cpu_to_le16('f'), cpu_to_le16('C'),
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cpu_to_le16('o'), cpu_to_le16('m'), cpu_to_le16('p'), cpu_to_le16('r'),
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cpu_to_le16('e'), cpu_to_le16('s'), cpu_to_le16('s'), cpu_to_le16('e'),
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cpu_to_le16('d'), cpu_to_le16('D'), cpu_to_le16('a'), cpu_to_le16('t'),
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cpu_to_le16('a'),
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};
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#endif
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static const __le16 CON_NAME[3] = {
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cpu_to_le16('C'), cpu_to_le16('O'), cpu_to_le16('N'),
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};
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static const __le16 NUL_NAME[3] = {
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cpu_to_le16('N'), cpu_to_le16('U'), cpu_to_le16('L'),
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};
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static const __le16 AUX_NAME[3] = {
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cpu_to_le16('A'), cpu_to_le16('U'), cpu_to_le16('X'),
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};
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static const __le16 PRN_NAME[3] = {
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cpu_to_le16('P'), cpu_to_le16('R'), cpu_to_le16('N'),
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};
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static const __le16 COM_NAME[3] = {
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cpu_to_le16('C'), cpu_to_le16('O'), cpu_to_le16('M'),
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};
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static const __le16 LPT_NAME[3] = {
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cpu_to_le16('L'), cpu_to_le16('P'), cpu_to_le16('T'),
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};
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// clang-format on
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/*
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* ntfs_fix_pre_write - Insert fixups into @rhdr before writing to disk.
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*/
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bool ntfs_fix_pre_write(struct NTFS_RECORD_HEADER *rhdr, size_t bytes)
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{
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u16 *fixup, *ptr;
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u16 sample;
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u16 fo = le16_to_cpu(rhdr->fix_off);
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u16 fn = le16_to_cpu(rhdr->fix_num);
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if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
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fn * SECTOR_SIZE > bytes) {
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return false;
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}
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/* Get fixup pointer. */
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fixup = Add2Ptr(rhdr, fo);
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if (*fixup >= 0x7FFF)
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*fixup = 1;
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else
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*fixup += 1;
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sample = *fixup;
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ptr = Add2Ptr(rhdr, SECTOR_SIZE - sizeof(short));
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while (fn--) {
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*++fixup = *ptr;
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*ptr = sample;
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ptr += SECTOR_SIZE / sizeof(short);
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}
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return true;
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}
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/*
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* ntfs_fix_post_read - Remove fixups after reading from disk.
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*
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* Return: < 0 if error, 0 if ok, 1 if need to update fixups.
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*/
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int ntfs_fix_post_read(struct NTFS_RECORD_HEADER *rhdr, size_t bytes,
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bool simple)
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{
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int ret;
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u16 *fixup, *ptr;
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u16 sample, fo, fn;
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fo = le16_to_cpu(rhdr->fix_off);
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fn = simple ? ((bytes >> SECTOR_SHIFT) + 1) :
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le16_to_cpu(rhdr->fix_num);
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/* Check errors. */
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if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
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fn * SECTOR_SIZE > bytes) {
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return -E_NTFS_CORRUPT;
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}
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/* Get fixup pointer. */
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fixup = Add2Ptr(rhdr, fo);
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sample = *fixup;
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ptr = Add2Ptr(rhdr, SECTOR_SIZE - sizeof(short));
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ret = 0;
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while (fn--) {
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/* Test current word. */
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if (*ptr != sample) {
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/* Fixup does not match! Is it serious error? */
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ret = -E_NTFS_FIXUP;
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}
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/* Replace fixup. */
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*ptr = *++fixup;
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ptr += SECTOR_SIZE / sizeof(short);
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}
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return ret;
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}
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/*
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* ntfs_extend_init - Load $Extend file.
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*/
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int ntfs_extend_init(struct ntfs_sb_info *sbi)
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{
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int err;
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struct super_block *sb = sbi->sb;
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struct inode *inode, *inode2;
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struct MFT_REF ref;
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if (sbi->volume.major_ver < 3) {
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ntfs_notice(sb, "Skip $Extend 'cause NTFS version");
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return 0;
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}
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ref.low = cpu_to_le32(MFT_REC_EXTEND);
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ref.high = 0;
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ref.seq = cpu_to_le16(MFT_REC_EXTEND);
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inode = ntfs_iget5(sb, &ref, &NAME_EXTEND);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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ntfs_err(sb, "Failed to load $Extend (%d).", err);
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inode = NULL;
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goto out;
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}
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/* If ntfs_iget5() reads from disk it never returns bad inode. */
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if (!S_ISDIR(inode->i_mode)) {
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err = -EINVAL;
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goto out;
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}
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/* Try to find $ObjId */
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inode2 = dir_search_u(inode, &NAME_OBJID, NULL);
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if (inode2 && !IS_ERR(inode2)) {
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if (is_bad_inode(inode2)) {
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iput(inode2);
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} else {
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sbi->objid.ni = ntfs_i(inode2);
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sbi->objid_no = inode2->i_ino;
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}
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}
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/* Try to find $Quota */
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inode2 = dir_search_u(inode, &NAME_QUOTA, NULL);
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if (inode2 && !IS_ERR(inode2)) {
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sbi->quota_no = inode2->i_ino;
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iput(inode2);
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}
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/* Try to find $Reparse */
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inode2 = dir_search_u(inode, &NAME_REPARSE, NULL);
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if (inode2 && !IS_ERR(inode2)) {
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sbi->reparse.ni = ntfs_i(inode2);
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sbi->reparse_no = inode2->i_ino;
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}
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/* Try to find $UsnJrnl */
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inode2 = dir_search_u(inode, &NAME_USNJRNL, NULL);
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if (inode2 && !IS_ERR(inode2)) {
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sbi->usn_jrnl_no = inode2->i_ino;
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iput(inode2);
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}
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err = 0;
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out:
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iput(inode);
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return err;
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}
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int ntfs_loadlog_and_replay(struct ntfs_inode *ni, struct ntfs_sb_info *sbi)
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{
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int err = 0;
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struct super_block *sb = sbi->sb;
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bool initialized = false;
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struct MFT_REF ref;
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struct inode *inode;
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/* Check for 4GB. */
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if (ni->vfs_inode.i_size >= 0x100000000ull) {
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ntfs_err(sb, "\x24LogFile is large than 4G.");
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err = -EINVAL;
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goto out;
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}
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sbi->flags |= NTFS_FLAGS_LOG_REPLAYING;
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ref.low = cpu_to_le32(MFT_REC_MFT);
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ref.high = 0;
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ref.seq = cpu_to_le16(1);
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inode = ntfs_iget5(sb, &ref, NULL);
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if (IS_ERR(inode))
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inode = NULL;
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if (!inode) {
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/* Try to use MFT copy. */
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u64 t64 = sbi->mft.lbo;
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sbi->mft.lbo = sbi->mft.lbo2;
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inode = ntfs_iget5(sb, &ref, NULL);
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sbi->mft.lbo = t64;
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if (IS_ERR(inode))
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inode = NULL;
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}
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if (!inode) {
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err = -EINVAL;
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ntfs_err(sb, "Failed to load $MFT.");
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goto out;
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}
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sbi->mft.ni = ntfs_i(inode);
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/* LogFile should not contains attribute list. */
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err = ni_load_all_mi(sbi->mft.ni);
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if (!err)
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err = log_replay(ni, &initialized);
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iput(inode);
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sbi->mft.ni = NULL;
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sync_blockdev(sb->s_bdev);
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invalidate_bdev(sb->s_bdev);
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if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) {
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err = 0;
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goto out;
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}
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if (sb_rdonly(sb) || !initialized)
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goto out;
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/* Fill LogFile by '-1' if it is initialized. */
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err = ntfs_bio_fill_1(sbi, &ni->file.run);
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out:
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sbi->flags &= ~NTFS_FLAGS_LOG_REPLAYING;
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return err;
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}
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/*
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* ntfs_look_for_free_space - Look for a free space in bitmap.
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*/
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int ntfs_look_for_free_space(struct ntfs_sb_info *sbi, CLST lcn, CLST len,
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CLST *new_lcn, CLST *new_len,
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enum ALLOCATE_OPT opt)
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{
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int err;
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CLST alen;
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struct super_block *sb = sbi->sb;
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size_t alcn, zlen, zeroes, zlcn, zlen2, ztrim, new_zlen;
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struct wnd_bitmap *wnd = &sbi->used.bitmap;
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down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
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if (opt & ALLOCATE_MFT) {
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zlen = wnd_zone_len(wnd);
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if (!zlen) {
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err = ntfs_refresh_zone(sbi);
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if (err)
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goto up_write;
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zlen = wnd_zone_len(wnd);
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}
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if (!zlen) {
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ntfs_err(sbi->sb, "no free space to extend mft");
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err = -ENOSPC;
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goto up_write;
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}
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lcn = wnd_zone_bit(wnd);
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alen = min_t(CLST, len, zlen);
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wnd_zone_set(wnd, lcn + alen, zlen - alen);
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err = wnd_set_used(wnd, lcn, alen);
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if (err)
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goto up_write;
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alcn = lcn;
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goto space_found;
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}
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/*
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* 'Cause cluster 0 is always used this value means that we should use
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* cached value of 'next_free_lcn' to improve performance.
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*/
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if (!lcn)
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lcn = sbi->used.next_free_lcn;
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if (lcn >= wnd->nbits)
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lcn = 0;
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alen = wnd_find(wnd, len, lcn, BITMAP_FIND_MARK_AS_USED, &alcn);
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if (alen)
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goto space_found;
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/* Try to use clusters from MftZone. */
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zlen = wnd_zone_len(wnd);
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zeroes = wnd_zeroes(wnd);
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/* Check too big request */
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if (len > zeroes + zlen || zlen <= NTFS_MIN_MFT_ZONE) {
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err = -ENOSPC;
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goto up_write;
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}
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/* How many clusters to cat from zone. */
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zlcn = wnd_zone_bit(wnd);
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zlen2 = zlen >> 1;
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ztrim = clamp_val(len, zlen2, zlen);
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new_zlen = max_t(size_t, zlen - ztrim, NTFS_MIN_MFT_ZONE);
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wnd_zone_set(wnd, zlcn, new_zlen);
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/* Allocate continues clusters. */
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alen = wnd_find(wnd, len, 0,
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BITMAP_FIND_MARK_AS_USED | BITMAP_FIND_FULL, &alcn);
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if (!alen) {
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err = -ENOSPC;
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goto up_write;
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}
|
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space_found:
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err = 0;
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*new_len = alen;
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*new_lcn = alcn;
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ntfs_unmap_meta(sb, alcn, alen);
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/* Set hint for next requests. */
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if (!(opt & ALLOCATE_MFT))
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sbi->used.next_free_lcn = alcn + alen;
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up_write:
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up_write(&wnd->rw_lock);
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return err;
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}
|
|
|
|
/*
|
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* ntfs_check_for_free_space
|
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*
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* Check if it is possible to allocate 'clen' clusters and 'mlen' Mft records
|
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*/
|
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bool ntfs_check_for_free_space(struct ntfs_sb_info *sbi, CLST clen, CLST mlen)
|
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{
|
|
size_t free, zlen, avail;
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struct wnd_bitmap *wnd;
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wnd = &sbi->used.bitmap;
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down_read_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
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free = wnd_zeroes(wnd);
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zlen = min_t(size_t, NTFS_MIN_MFT_ZONE, wnd_zone_len(wnd));
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up_read(&wnd->rw_lock);
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if (free < zlen + clen)
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return false;
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avail = free - (zlen + clen);
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wnd = &sbi->mft.bitmap;
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down_read_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT);
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free = wnd_zeroes(wnd);
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zlen = wnd_zone_len(wnd);
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up_read(&wnd->rw_lock);
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|
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if (free >= zlen + mlen)
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return true;
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|
|
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return avail >= bytes_to_cluster(sbi, mlen << sbi->record_bits);
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}
|
|
|
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/*
|
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* ntfs_extend_mft - Allocate additional MFT records.
|
|
*
|
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* sbi->mft.bitmap is locked for write.
|
|
*
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|
* NOTE: recursive:
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* ntfs_look_free_mft ->
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* ntfs_extend_mft ->
|
|
* attr_set_size ->
|
|
* ni_insert_nonresident ->
|
|
* ni_insert_attr ->
|
|
* ni_ins_attr_ext ->
|
|
* ntfs_look_free_mft ->
|
|
* ntfs_extend_mft
|
|
*
|
|
* To avoid recursive always allocate space for two new MFT records
|
|
* see attrib.c: "at least two MFT to avoid recursive loop".
|
|
*/
|
|
static int ntfs_extend_mft(struct ntfs_sb_info *sbi)
|
|
{
|
|
int err;
|
|
struct ntfs_inode *ni = sbi->mft.ni;
|
|
size_t new_mft_total;
|
|
u64 new_mft_bytes, new_bitmap_bytes;
|
|
struct ATTRIB *attr;
|
|
struct wnd_bitmap *wnd = &sbi->mft.bitmap;
|
|
|
|
new_mft_total = ALIGN(wnd->nbits + NTFS_MFT_INCREASE_STEP, 128);
|
|
new_mft_bytes = (u64)new_mft_total << sbi->record_bits;
|
|
|
|
/* Step 1: Resize $MFT::DATA. */
|
|
down_write(&ni->file.run_lock);
|
|
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
|
|
new_mft_bytes, NULL, false, &attr);
|
|
|
|
if (err) {
|
|
up_write(&ni->file.run_lock);
|
|
goto out;
|
|
}
|
|
|
|
attr->nres.valid_size = attr->nres.data_size;
|
|
new_mft_total = le64_to_cpu(attr->nres.alloc_size) >> sbi->record_bits;
|
|
ni->mi.dirty = true;
|
|
|
|
/* Step 2: Resize $MFT::BITMAP. */
|
|
new_bitmap_bytes = bitmap_size(new_mft_total);
|
|
|
|
err = attr_set_size(ni, ATTR_BITMAP, NULL, 0, &sbi->mft.bitmap.run,
|
|
new_bitmap_bytes, &new_bitmap_bytes, true, NULL);
|
|
|
|
/* Refresh MFT Zone if necessary. */
|
|
down_write_nested(&sbi->used.bitmap.rw_lock, BITMAP_MUTEX_CLUSTERS);
|
|
|
|
ntfs_refresh_zone(sbi);
|
|
|
|
up_write(&sbi->used.bitmap.rw_lock);
|
|
up_write(&ni->file.run_lock);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
err = wnd_extend(wnd, new_mft_total);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
ntfs_clear_mft_tail(sbi, sbi->mft.used, new_mft_total);
|
|
|
|
err = _ni_write_inode(&ni->vfs_inode, 0);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_look_free_mft - Look for a free MFT record.
|
|
*/
|
|
int ntfs_look_free_mft(struct ntfs_sb_info *sbi, CLST *rno, bool mft,
|
|
struct ntfs_inode *ni, struct mft_inode **mi)
|
|
{
|
|
int err = 0;
|
|
size_t zbit, zlen, from, to, fr;
|
|
size_t mft_total;
|
|
struct MFT_REF ref;
|
|
struct super_block *sb = sbi->sb;
|
|
struct wnd_bitmap *wnd = &sbi->mft.bitmap;
|
|
u32 ir;
|
|
|
|
static_assert(sizeof(sbi->mft.reserved_bitmap) * 8 >=
|
|
MFT_REC_FREE - MFT_REC_RESERVED);
|
|
|
|
if (!mft)
|
|
down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT);
|
|
|
|
zlen = wnd_zone_len(wnd);
|
|
|
|
/* Always reserve space for MFT. */
|
|
if (zlen) {
|
|
if (mft) {
|
|
zbit = wnd_zone_bit(wnd);
|
|
*rno = zbit;
|
|
wnd_zone_set(wnd, zbit + 1, zlen - 1);
|
|
}
|
|
goto found;
|
|
}
|
|
|
|
/* No MFT zone. Find the nearest to '0' free MFT. */
|
|
if (!wnd_find(wnd, 1, MFT_REC_FREE, 0, &zbit)) {
|
|
/* Resize MFT */
|
|
mft_total = wnd->nbits;
|
|
|
|
err = ntfs_extend_mft(sbi);
|
|
if (!err) {
|
|
zbit = mft_total;
|
|
goto reserve_mft;
|
|
}
|
|
|
|
if (!mft || MFT_REC_FREE == sbi->mft.next_reserved)
|
|
goto out;
|
|
|
|
err = 0;
|
|
|
|
/*
|
|
* Look for free record reserved area [11-16) ==
|
|
* [MFT_REC_RESERVED, MFT_REC_FREE ) MFT bitmap always
|
|
* marks it as used.
|
|
*/
|
|
if (!sbi->mft.reserved_bitmap) {
|
|
/* Once per session create internal bitmap for 5 bits. */
|
|
sbi->mft.reserved_bitmap = 0xFF;
|
|
|
|
ref.high = 0;
|
|
for (ir = MFT_REC_RESERVED; ir < MFT_REC_FREE; ir++) {
|
|
struct inode *i;
|
|
struct ntfs_inode *ni;
|
|
struct MFT_REC *mrec;
|
|
|
|
ref.low = cpu_to_le32(ir);
|
|
ref.seq = cpu_to_le16(ir);
|
|
|
|
i = ntfs_iget5(sb, &ref, NULL);
|
|
if (IS_ERR(i)) {
|
|
next:
|
|
ntfs_notice(
|
|
sb,
|
|
"Invalid reserved record %x",
|
|
ref.low);
|
|
continue;
|
|
}
|
|
if (is_bad_inode(i)) {
|
|
iput(i);
|
|
goto next;
|
|
}
|
|
|
|
ni = ntfs_i(i);
|
|
|
|
mrec = ni->mi.mrec;
|
|
|
|
if (!is_rec_base(mrec))
|
|
goto next;
|
|
|
|
if (mrec->hard_links)
|
|
goto next;
|
|
|
|
if (!ni_std(ni))
|
|
goto next;
|
|
|
|
if (ni_find_attr(ni, NULL, NULL, ATTR_NAME,
|
|
NULL, 0, NULL, NULL))
|
|
goto next;
|
|
|
|
__clear_bit(ir - MFT_REC_RESERVED,
|
|
&sbi->mft.reserved_bitmap);
|
|
}
|
|
}
|
|
|
|
/* Scan 5 bits for zero. Bit 0 == MFT_REC_RESERVED */
|
|
zbit = find_next_zero_bit(&sbi->mft.reserved_bitmap,
|
|
MFT_REC_FREE, MFT_REC_RESERVED);
|
|
if (zbit >= MFT_REC_FREE) {
|
|
sbi->mft.next_reserved = MFT_REC_FREE;
|
|
goto out;
|
|
}
|
|
|
|
zlen = 1;
|
|
sbi->mft.next_reserved = zbit;
|
|
} else {
|
|
reserve_mft:
|
|
zlen = zbit == MFT_REC_FREE ? (MFT_REC_USER - MFT_REC_FREE) : 4;
|
|
if (zbit + zlen > wnd->nbits)
|
|
zlen = wnd->nbits - zbit;
|
|
|
|
while (zlen > 1 && !wnd_is_free(wnd, zbit, zlen))
|
|
zlen -= 1;
|
|
|
|
/* [zbit, zbit + zlen) will be used for MFT itself. */
|
|
from = sbi->mft.used;
|
|
if (from < zbit)
|
|
from = zbit;
|
|
to = zbit + zlen;
|
|
if (from < to) {
|
|
ntfs_clear_mft_tail(sbi, from, to);
|
|
sbi->mft.used = to;
|
|
}
|
|
}
|
|
|
|
if (mft) {
|
|
*rno = zbit;
|
|
zbit += 1;
|
|
zlen -= 1;
|
|
}
|
|
|
|
wnd_zone_set(wnd, zbit, zlen);
|
|
|
|
found:
|
|
if (!mft) {
|
|
/* The request to get record for general purpose. */
|
|
if (sbi->mft.next_free < MFT_REC_USER)
|
|
sbi->mft.next_free = MFT_REC_USER;
|
|
|
|
for (;;) {
|
|
if (sbi->mft.next_free >= sbi->mft.bitmap.nbits) {
|
|
} else if (!wnd_find(wnd, 1, MFT_REC_USER, 0, &fr)) {
|
|
sbi->mft.next_free = sbi->mft.bitmap.nbits;
|
|
} else {
|
|
*rno = fr;
|
|
sbi->mft.next_free = *rno + 1;
|
|
break;
|
|
}
|
|
|
|
err = ntfs_extend_mft(sbi);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (ni && !ni_add_subrecord(ni, *rno, mi)) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* We have found a record that are not reserved for next MFT. */
|
|
if (*rno >= MFT_REC_FREE)
|
|
wnd_set_used(wnd, *rno, 1);
|
|
else if (*rno >= MFT_REC_RESERVED && sbi->mft.reserved_bitmap_inited)
|
|
__set_bit(*rno - MFT_REC_RESERVED, &sbi->mft.reserved_bitmap);
|
|
|
|
out:
|
|
if (!mft)
|
|
up_write(&wnd->rw_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_mark_rec_free - Mark record as free.
|
|
* is_mft - true if we are changing MFT
|
|
*/
|
|
void ntfs_mark_rec_free(struct ntfs_sb_info *sbi, CLST rno, bool is_mft)
|
|
{
|
|
struct wnd_bitmap *wnd = &sbi->mft.bitmap;
|
|
|
|
if (!is_mft)
|
|
down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT);
|
|
if (rno >= wnd->nbits)
|
|
goto out;
|
|
|
|
if (rno >= MFT_REC_FREE) {
|
|
if (!wnd_is_used(wnd, rno, 1))
|
|
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
|
|
else
|
|
wnd_set_free(wnd, rno, 1);
|
|
} else if (rno >= MFT_REC_RESERVED && sbi->mft.reserved_bitmap_inited) {
|
|
__clear_bit(rno - MFT_REC_RESERVED, &sbi->mft.reserved_bitmap);
|
|
}
|
|
|
|
if (rno < wnd_zone_bit(wnd))
|
|
wnd_zone_set(wnd, rno, 1);
|
|
else if (rno < sbi->mft.next_free && rno >= MFT_REC_USER)
|
|
sbi->mft.next_free = rno;
|
|
|
|
out:
|
|
if (!is_mft)
|
|
up_write(&wnd->rw_lock);
|
|
}
|
|
|
|
/*
|
|
* ntfs_clear_mft_tail - Format empty records [from, to).
|
|
*
|
|
* sbi->mft.bitmap is locked for write.
|
|
*/
|
|
int ntfs_clear_mft_tail(struct ntfs_sb_info *sbi, size_t from, size_t to)
|
|
{
|
|
int err;
|
|
u32 rs;
|
|
u64 vbo;
|
|
struct runs_tree *run;
|
|
struct ntfs_inode *ni;
|
|
|
|
if (from >= to)
|
|
return 0;
|
|
|
|
rs = sbi->record_size;
|
|
ni = sbi->mft.ni;
|
|
run = &ni->file.run;
|
|
|
|
down_read(&ni->file.run_lock);
|
|
vbo = (u64)from * rs;
|
|
for (; from < to; from++, vbo += rs) {
|
|
struct ntfs_buffers nb;
|
|
|
|
err = ntfs_get_bh(sbi, run, vbo, rs, &nb);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = ntfs_write_bh(sbi, &sbi->new_rec->rhdr, &nb, 0);
|
|
nb_put(&nb);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
sbi->mft.used = from;
|
|
up_read(&ni->file.run_lock);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_refresh_zone - Refresh MFT zone.
|
|
*
|
|
* sbi->used.bitmap is locked for rw.
|
|
* sbi->mft.bitmap is locked for write.
|
|
* sbi->mft.ni->file.run_lock for write.
|
|
*/
|
|
int ntfs_refresh_zone(struct ntfs_sb_info *sbi)
|
|
{
|
|
CLST lcn, vcn, len;
|
|
size_t lcn_s, zlen;
|
|
struct wnd_bitmap *wnd = &sbi->used.bitmap;
|
|
struct ntfs_inode *ni = sbi->mft.ni;
|
|
|
|
/* Do not change anything unless we have non empty MFT zone. */
|
|
if (wnd_zone_len(wnd))
|
|
return 0;
|
|
|
|
vcn = bytes_to_cluster(sbi,
|
|
(u64)sbi->mft.bitmap.nbits << sbi->record_bits);
|
|
|
|
if (!run_lookup_entry(&ni->file.run, vcn - 1, &lcn, &len, NULL))
|
|
lcn = SPARSE_LCN;
|
|
|
|
/* We should always find Last Lcn for MFT. */
|
|
if (lcn == SPARSE_LCN)
|
|
return -EINVAL;
|
|
|
|
lcn_s = lcn + 1;
|
|
|
|
/* Try to allocate clusters after last MFT run. */
|
|
zlen = wnd_find(wnd, sbi->zone_max, lcn_s, 0, &lcn_s);
|
|
wnd_zone_set(wnd, lcn_s, zlen);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ntfs_update_mftmirr - Update $MFTMirr data.
|
|
*/
|
|
void ntfs_update_mftmirr(struct ntfs_sb_info *sbi, int wait)
|
|
{
|
|
int err;
|
|
struct super_block *sb = sbi->sb;
|
|
u32 blocksize, bytes;
|
|
sector_t block1, block2;
|
|
|
|
/*
|
|
* sb can be NULL here. In this case sbi->flags should be 0 too.
|
|
*/
|
|
if (!sb || !(sbi->flags & NTFS_FLAGS_MFTMIRR))
|
|
return;
|
|
|
|
blocksize = sb->s_blocksize;
|
|
bytes = sbi->mft.recs_mirr << sbi->record_bits;
|
|
block1 = sbi->mft.lbo >> sb->s_blocksize_bits;
|
|
block2 = sbi->mft.lbo2 >> sb->s_blocksize_bits;
|
|
|
|
for (; bytes >= blocksize; bytes -= blocksize) {
|
|
struct buffer_head *bh1, *bh2;
|
|
|
|
bh1 = sb_bread(sb, block1++);
|
|
if (!bh1)
|
|
return;
|
|
|
|
bh2 = sb_getblk(sb, block2++);
|
|
if (!bh2) {
|
|
put_bh(bh1);
|
|
return;
|
|
}
|
|
|
|
if (buffer_locked(bh2))
|
|
__wait_on_buffer(bh2);
|
|
|
|
lock_buffer(bh2);
|
|
memcpy(bh2->b_data, bh1->b_data, blocksize);
|
|
set_buffer_uptodate(bh2);
|
|
mark_buffer_dirty(bh2);
|
|
unlock_buffer(bh2);
|
|
|
|
put_bh(bh1);
|
|
bh1 = NULL;
|
|
|
|
err = wait ? sync_dirty_buffer(bh2) : 0;
|
|
|
|
put_bh(bh2);
|
|
if (err)
|
|
return;
|
|
}
|
|
|
|
sbi->flags &= ~NTFS_FLAGS_MFTMIRR;
|
|
}
|
|
|
|
/*
|
|
* ntfs_bad_inode
|
|
*
|
|
* Marks inode as bad and marks fs as 'dirty'
|
|
*/
|
|
void ntfs_bad_inode(struct inode *inode, const char *hint)
|
|
{
|
|
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
|
|
|
|
ntfs_inode_err(inode, "%s", hint);
|
|
make_bad_inode(inode);
|
|
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
|
|
}
|
|
|
|
/*
|
|
* ntfs_set_state
|
|
*
|
|
* Mount: ntfs_set_state(NTFS_DIRTY_DIRTY)
|
|
* Umount: ntfs_set_state(NTFS_DIRTY_CLEAR)
|
|
* NTFS error: ntfs_set_state(NTFS_DIRTY_ERROR)
|
|
*/
|
|
int ntfs_set_state(struct ntfs_sb_info *sbi, enum NTFS_DIRTY_FLAGS dirty)
|
|
{
|
|
int err;
|
|
struct ATTRIB *attr;
|
|
struct VOLUME_INFO *info;
|
|
struct mft_inode *mi;
|
|
struct ntfs_inode *ni;
|
|
__le16 info_flags;
|
|
|
|
/*
|
|
* Do not change state if fs was real_dirty.
|
|
* Do not change state if fs already dirty(clear).
|
|
* Do not change any thing if mounted read only.
|
|
*/
|
|
if (sbi->volume.real_dirty || sb_rdonly(sbi->sb))
|
|
return 0;
|
|
|
|
/* Check cached value. */
|
|
if ((dirty == NTFS_DIRTY_CLEAR ? 0 : VOLUME_FLAG_DIRTY) ==
|
|
(sbi->volume.flags & VOLUME_FLAG_DIRTY))
|
|
return 0;
|
|
|
|
ni = sbi->volume.ni;
|
|
if (!ni)
|
|
return -EINVAL;
|
|
|
|
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_DIRTY);
|
|
|
|
attr = ni_find_attr(ni, NULL, NULL, ATTR_VOL_INFO, NULL, 0, NULL, &mi);
|
|
if (!attr) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO);
|
|
if (!info) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
info_flags = info->flags;
|
|
|
|
switch (dirty) {
|
|
case NTFS_DIRTY_ERROR:
|
|
ntfs_notice(sbi->sb, "Mark volume as dirty due to NTFS errors");
|
|
sbi->volume.real_dirty = true;
|
|
fallthrough;
|
|
case NTFS_DIRTY_DIRTY:
|
|
info->flags |= VOLUME_FLAG_DIRTY;
|
|
break;
|
|
case NTFS_DIRTY_CLEAR:
|
|
info->flags &= ~VOLUME_FLAG_DIRTY;
|
|
break;
|
|
}
|
|
/* Cache current volume flags. */
|
|
if (info_flags != info->flags) {
|
|
sbi->volume.flags = info->flags;
|
|
mi->dirty = true;
|
|
}
|
|
err = 0;
|
|
|
|
out:
|
|
ni_unlock(ni);
|
|
if (err)
|
|
return err;
|
|
|
|
mark_inode_dirty(&ni->vfs_inode);
|
|
/* verify(!ntfs_update_mftmirr()); */
|
|
|
|
/*
|
|
* If we used wait=1, sync_inode_metadata waits for the io for the
|
|
* inode to finish. It hangs when media is removed.
|
|
* So wait=0 is sent down to sync_inode_metadata
|
|
* and filemap_fdatawrite is used for the data blocks.
|
|
*/
|
|
err = sync_inode_metadata(&ni->vfs_inode, 0);
|
|
if (!err)
|
|
err = filemap_fdatawrite(ni->vfs_inode.i_mapping);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* security_hash - Calculates a hash of security descriptor.
|
|
*/
|
|
static inline __le32 security_hash(const void *sd, size_t bytes)
|
|
{
|
|
u32 hash = 0;
|
|
const __le32 *ptr = sd;
|
|
|
|
bytes >>= 2;
|
|
while (bytes--)
|
|
hash = ((hash >> 0x1D) | (hash << 3)) + le32_to_cpu(*ptr++);
|
|
return cpu_to_le32(hash);
|
|
}
|
|
|
|
int ntfs_sb_read(struct super_block *sb, u64 lbo, size_t bytes, void *buffer)
|
|
{
|
|
struct block_device *bdev = sb->s_bdev;
|
|
u32 blocksize = sb->s_blocksize;
|
|
u64 block = lbo >> sb->s_blocksize_bits;
|
|
u32 off = lbo & (blocksize - 1);
|
|
u32 op = blocksize - off;
|
|
|
|
for (; bytes; block += 1, off = 0, op = blocksize) {
|
|
struct buffer_head *bh = __bread(bdev, block, blocksize);
|
|
|
|
if (!bh)
|
|
return -EIO;
|
|
|
|
if (op > bytes)
|
|
op = bytes;
|
|
|
|
memcpy(buffer, bh->b_data + off, op);
|
|
|
|
put_bh(bh);
|
|
|
|
bytes -= op;
|
|
buffer = Add2Ptr(buffer, op);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ntfs_sb_write(struct super_block *sb, u64 lbo, size_t bytes,
|
|
const void *buf, int wait)
|
|
{
|
|
u32 blocksize = sb->s_blocksize;
|
|
struct block_device *bdev = sb->s_bdev;
|
|
sector_t block = lbo >> sb->s_blocksize_bits;
|
|
u32 off = lbo & (blocksize - 1);
|
|
u32 op = blocksize - off;
|
|
struct buffer_head *bh;
|
|
|
|
if (!wait && (sb->s_flags & SB_SYNCHRONOUS))
|
|
wait = 1;
|
|
|
|
for (; bytes; block += 1, off = 0, op = blocksize) {
|
|
if (op > bytes)
|
|
op = bytes;
|
|
|
|
if (op < blocksize) {
|
|
bh = __bread(bdev, block, blocksize);
|
|
if (!bh) {
|
|
ntfs_err(sb, "failed to read block %llx",
|
|
(u64)block);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
bh = __getblk(bdev, block, blocksize);
|
|
if (!bh)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (buffer_locked(bh))
|
|
__wait_on_buffer(bh);
|
|
|
|
lock_buffer(bh);
|
|
if (buf) {
|
|
memcpy(bh->b_data + off, buf, op);
|
|
buf = Add2Ptr(buf, op);
|
|
} else {
|
|
memset(bh->b_data + off, -1, op);
|
|
}
|
|
|
|
set_buffer_uptodate(bh);
|
|
mark_buffer_dirty(bh);
|
|
unlock_buffer(bh);
|
|
|
|
if (wait) {
|
|
int err = sync_dirty_buffer(bh);
|
|
|
|
if (err) {
|
|
ntfs_err(
|
|
sb,
|
|
"failed to sync buffer at block %llx, error %d",
|
|
(u64)block, err);
|
|
put_bh(bh);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
put_bh(bh);
|
|
|
|
bytes -= op;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ntfs_sb_write_run(struct ntfs_sb_info *sbi, const struct runs_tree *run,
|
|
u64 vbo, const void *buf, size_t bytes, int sync)
|
|
{
|
|
struct super_block *sb = sbi->sb;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
u32 off = vbo & sbi->cluster_mask;
|
|
CLST lcn, clen, vcn = vbo >> cluster_bits, vcn_next;
|
|
u64 lbo, len;
|
|
size_t idx;
|
|
|
|
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx))
|
|
return -ENOENT;
|
|
|
|
if (lcn == SPARSE_LCN)
|
|
return -EINVAL;
|
|
|
|
lbo = ((u64)lcn << cluster_bits) + off;
|
|
len = ((u64)clen << cluster_bits) - off;
|
|
|
|
for (;;) {
|
|
u32 op = min_t(u64, len, bytes);
|
|
int err = ntfs_sb_write(sb, lbo, op, buf, sync);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
bytes -= op;
|
|
if (!bytes)
|
|
break;
|
|
|
|
vcn_next = vcn + clen;
|
|
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
|
|
vcn != vcn_next)
|
|
return -ENOENT;
|
|
|
|
if (lcn == SPARSE_LCN)
|
|
return -EINVAL;
|
|
|
|
if (buf)
|
|
buf = Add2Ptr(buf, op);
|
|
|
|
lbo = ((u64)lcn << cluster_bits);
|
|
len = ((u64)clen << cluster_bits);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct buffer_head *ntfs_bread_run(struct ntfs_sb_info *sbi,
|
|
const struct runs_tree *run, u64 vbo)
|
|
{
|
|
struct super_block *sb = sbi->sb;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
CLST lcn;
|
|
u64 lbo;
|
|
|
|
if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, NULL, NULL))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
lbo = ((u64)lcn << cluster_bits) + (vbo & sbi->cluster_mask);
|
|
|
|
return ntfs_bread(sb, lbo >> sb->s_blocksize_bits);
|
|
}
|
|
|
|
int ntfs_read_run_nb(struct ntfs_sb_info *sbi, const struct runs_tree *run,
|
|
u64 vbo, void *buf, u32 bytes, struct ntfs_buffers *nb)
|
|
{
|
|
int err;
|
|
struct super_block *sb = sbi->sb;
|
|
u32 blocksize = sb->s_blocksize;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
u32 off = vbo & sbi->cluster_mask;
|
|
u32 nbh = 0;
|
|
CLST vcn_next, vcn = vbo >> cluster_bits;
|
|
CLST lcn, clen;
|
|
u64 lbo, len;
|
|
size_t idx;
|
|
struct buffer_head *bh;
|
|
|
|
if (!run) {
|
|
/* First reading of $Volume + $MFTMirr + $LogFile goes here. */
|
|
if (vbo > MFT_REC_VOL * sbi->record_size) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/* Use absolute boot's 'MFTCluster' to read record. */
|
|
lbo = vbo + sbi->mft.lbo;
|
|
len = sbi->record_size;
|
|
} else if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
} else {
|
|
if (lcn == SPARSE_LCN) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
lbo = ((u64)lcn << cluster_bits) + off;
|
|
len = ((u64)clen << cluster_bits) - off;
|
|
}
|
|
|
|
off = lbo & (blocksize - 1);
|
|
if (nb) {
|
|
nb->off = off;
|
|
nb->bytes = bytes;
|
|
}
|
|
|
|
for (;;) {
|
|
u32 len32 = len >= bytes ? bytes : len;
|
|
sector_t block = lbo >> sb->s_blocksize_bits;
|
|
|
|
do {
|
|
u32 op = blocksize - off;
|
|
|
|
if (op > len32)
|
|
op = len32;
|
|
|
|
bh = ntfs_bread(sb, block);
|
|
if (!bh) {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
if (buf) {
|
|
memcpy(buf, bh->b_data + off, op);
|
|
buf = Add2Ptr(buf, op);
|
|
}
|
|
|
|
if (!nb) {
|
|
put_bh(bh);
|
|
} else if (nbh >= ARRAY_SIZE(nb->bh)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
} else {
|
|
nb->bh[nbh++] = bh;
|
|
nb->nbufs = nbh;
|
|
}
|
|
|
|
bytes -= op;
|
|
if (!bytes)
|
|
return 0;
|
|
len32 -= op;
|
|
block += 1;
|
|
off = 0;
|
|
|
|
} while (len32);
|
|
|
|
vcn_next = vcn + clen;
|
|
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
|
|
vcn != vcn_next) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
if (lcn == SPARSE_LCN) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
lbo = ((u64)lcn << cluster_bits);
|
|
len = ((u64)clen << cluster_bits);
|
|
}
|
|
|
|
out:
|
|
if (!nbh)
|
|
return err;
|
|
|
|
while (nbh) {
|
|
put_bh(nb->bh[--nbh]);
|
|
nb->bh[nbh] = NULL;
|
|
}
|
|
|
|
nb->nbufs = 0;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_read_bh
|
|
*
|
|
* Return: < 0 if error, 0 if ok, -E_NTFS_FIXUP if need to update fixups.
|
|
*/
|
|
int ntfs_read_bh(struct ntfs_sb_info *sbi, const struct runs_tree *run, u64 vbo,
|
|
struct NTFS_RECORD_HEADER *rhdr, u32 bytes,
|
|
struct ntfs_buffers *nb)
|
|
{
|
|
int err = ntfs_read_run_nb(sbi, run, vbo, rhdr, bytes, nb);
|
|
|
|
if (err)
|
|
return err;
|
|
return ntfs_fix_post_read(rhdr, nb->bytes, true);
|
|
}
|
|
|
|
int ntfs_get_bh(struct ntfs_sb_info *sbi, const struct runs_tree *run, u64 vbo,
|
|
u32 bytes, struct ntfs_buffers *nb)
|
|
{
|
|
int err = 0;
|
|
struct super_block *sb = sbi->sb;
|
|
u32 blocksize = sb->s_blocksize;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
CLST vcn_next, vcn = vbo >> cluster_bits;
|
|
u32 off;
|
|
u32 nbh = 0;
|
|
CLST lcn, clen;
|
|
u64 lbo, len;
|
|
size_t idx;
|
|
|
|
nb->bytes = bytes;
|
|
|
|
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
off = vbo & sbi->cluster_mask;
|
|
lbo = ((u64)lcn << cluster_bits) + off;
|
|
len = ((u64)clen << cluster_bits) - off;
|
|
|
|
nb->off = off = lbo & (blocksize - 1);
|
|
|
|
for (;;) {
|
|
u32 len32 = min_t(u64, len, bytes);
|
|
sector_t block = lbo >> sb->s_blocksize_bits;
|
|
|
|
do {
|
|
u32 op;
|
|
struct buffer_head *bh;
|
|
|
|
if (nbh >= ARRAY_SIZE(nb->bh)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
op = blocksize - off;
|
|
if (op > len32)
|
|
op = len32;
|
|
|
|
if (op == blocksize) {
|
|
bh = sb_getblk(sb, block);
|
|
if (!bh) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (buffer_locked(bh))
|
|
__wait_on_buffer(bh);
|
|
set_buffer_uptodate(bh);
|
|
} else {
|
|
bh = ntfs_bread(sb, block);
|
|
if (!bh) {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
nb->bh[nbh++] = bh;
|
|
bytes -= op;
|
|
if (!bytes) {
|
|
nb->nbufs = nbh;
|
|
return 0;
|
|
}
|
|
|
|
block += 1;
|
|
len32 -= op;
|
|
off = 0;
|
|
} while (len32);
|
|
|
|
vcn_next = vcn + clen;
|
|
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
|
|
vcn != vcn_next) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
lbo = ((u64)lcn << cluster_bits);
|
|
len = ((u64)clen << cluster_bits);
|
|
}
|
|
|
|
out:
|
|
while (nbh) {
|
|
put_bh(nb->bh[--nbh]);
|
|
nb->bh[nbh] = NULL;
|
|
}
|
|
|
|
nb->nbufs = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
int ntfs_write_bh(struct ntfs_sb_info *sbi, struct NTFS_RECORD_HEADER *rhdr,
|
|
struct ntfs_buffers *nb, int sync)
|
|
{
|
|
int err = 0;
|
|
struct super_block *sb = sbi->sb;
|
|
u32 block_size = sb->s_blocksize;
|
|
u32 bytes = nb->bytes;
|
|
u32 off = nb->off;
|
|
u16 fo = le16_to_cpu(rhdr->fix_off);
|
|
u16 fn = le16_to_cpu(rhdr->fix_num);
|
|
u32 idx;
|
|
__le16 *fixup;
|
|
__le16 sample;
|
|
|
|
if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
|
|
fn * SECTOR_SIZE > bytes) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (idx = 0; bytes && idx < nb->nbufs; idx += 1, off = 0) {
|
|
u32 op = block_size - off;
|
|
char *bh_data;
|
|
struct buffer_head *bh = nb->bh[idx];
|
|
__le16 *ptr, *end_data;
|
|
|
|
if (op > bytes)
|
|
op = bytes;
|
|
|
|
if (buffer_locked(bh))
|
|
__wait_on_buffer(bh);
|
|
|
|
lock_buffer(bh);
|
|
|
|
bh_data = bh->b_data + off;
|
|
end_data = Add2Ptr(bh_data, op);
|
|
memcpy(bh_data, rhdr, op);
|
|
|
|
if (!idx) {
|
|
u16 t16;
|
|
|
|
fixup = Add2Ptr(bh_data, fo);
|
|
sample = *fixup;
|
|
t16 = le16_to_cpu(sample);
|
|
if (t16 >= 0x7FFF) {
|
|
sample = *fixup = cpu_to_le16(1);
|
|
} else {
|
|
sample = cpu_to_le16(t16 + 1);
|
|
*fixup = sample;
|
|
}
|
|
|
|
*(__le16 *)Add2Ptr(rhdr, fo) = sample;
|
|
}
|
|
|
|
ptr = Add2Ptr(bh_data, SECTOR_SIZE - sizeof(short));
|
|
|
|
do {
|
|
*++fixup = *ptr;
|
|
*ptr = sample;
|
|
ptr += SECTOR_SIZE / sizeof(short);
|
|
} while (ptr < end_data);
|
|
|
|
set_buffer_uptodate(bh);
|
|
mark_buffer_dirty(bh);
|
|
unlock_buffer(bh);
|
|
|
|
if (sync) {
|
|
int err2 = sync_dirty_buffer(bh);
|
|
|
|
if (!err && err2)
|
|
err = err2;
|
|
}
|
|
|
|
bytes -= op;
|
|
rhdr = Add2Ptr(rhdr, op);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_bio_pages - Read/write pages from/to disk.
|
|
*/
|
|
int ntfs_bio_pages(struct ntfs_sb_info *sbi, const struct runs_tree *run,
|
|
struct page **pages, u32 nr_pages, u64 vbo, u32 bytes,
|
|
enum req_op op)
|
|
{
|
|
int err = 0;
|
|
struct bio *new, *bio = NULL;
|
|
struct super_block *sb = sbi->sb;
|
|
struct block_device *bdev = sb->s_bdev;
|
|
struct page *page;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
CLST lcn, clen, vcn, vcn_next;
|
|
u32 add, off, page_idx;
|
|
u64 lbo, len;
|
|
size_t run_idx;
|
|
struct blk_plug plug;
|
|
|
|
if (!bytes)
|
|
return 0;
|
|
|
|
blk_start_plug(&plug);
|
|
|
|
/* Align vbo and bytes to be 512 bytes aligned. */
|
|
lbo = (vbo + bytes + 511) & ~511ull;
|
|
vbo = vbo & ~511ull;
|
|
bytes = lbo - vbo;
|
|
|
|
vcn = vbo >> cluster_bits;
|
|
if (!run_lookup_entry(run, vcn, &lcn, &clen, &run_idx)) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
off = vbo & sbi->cluster_mask;
|
|
page_idx = 0;
|
|
page = pages[0];
|
|
|
|
for (;;) {
|
|
lbo = ((u64)lcn << cluster_bits) + off;
|
|
len = ((u64)clen << cluster_bits) - off;
|
|
new_bio:
|
|
new = bio_alloc(bdev, nr_pages - page_idx, op, GFP_NOFS);
|
|
if (bio) {
|
|
bio_chain(bio, new);
|
|
submit_bio(bio);
|
|
}
|
|
bio = new;
|
|
bio->bi_iter.bi_sector = lbo >> 9;
|
|
|
|
while (len) {
|
|
off = vbo & (PAGE_SIZE - 1);
|
|
add = off + len > PAGE_SIZE ? (PAGE_SIZE - off) : len;
|
|
|
|
if (bio_add_page(bio, page, add, off) < add)
|
|
goto new_bio;
|
|
|
|
if (bytes <= add)
|
|
goto out;
|
|
bytes -= add;
|
|
vbo += add;
|
|
|
|
if (add + off == PAGE_SIZE) {
|
|
page_idx += 1;
|
|
if (WARN_ON(page_idx >= nr_pages)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
page = pages[page_idx];
|
|
}
|
|
|
|
if (len <= add)
|
|
break;
|
|
len -= add;
|
|
lbo += add;
|
|
}
|
|
|
|
vcn_next = vcn + clen;
|
|
if (!run_get_entry(run, ++run_idx, &vcn, &lcn, &clen) ||
|
|
vcn != vcn_next) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
off = 0;
|
|
}
|
|
out:
|
|
if (bio) {
|
|
if (!err)
|
|
err = submit_bio_wait(bio);
|
|
bio_put(bio);
|
|
}
|
|
blk_finish_plug(&plug);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_bio_fill_1 - Helper for ntfs_loadlog_and_replay().
|
|
*
|
|
* Fill on-disk logfile range by (-1)
|
|
* this means empty logfile.
|
|
*/
|
|
int ntfs_bio_fill_1(struct ntfs_sb_info *sbi, const struct runs_tree *run)
|
|
{
|
|
int err = 0;
|
|
struct super_block *sb = sbi->sb;
|
|
struct block_device *bdev = sb->s_bdev;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
struct bio *new, *bio = NULL;
|
|
CLST lcn, clen;
|
|
u64 lbo, len;
|
|
size_t run_idx;
|
|
struct page *fill;
|
|
void *kaddr;
|
|
struct blk_plug plug;
|
|
|
|
fill = alloc_page(GFP_KERNEL);
|
|
if (!fill)
|
|
return -ENOMEM;
|
|
|
|
kaddr = kmap_atomic(fill);
|
|
memset(kaddr, -1, PAGE_SIZE);
|
|
kunmap_atomic(kaddr);
|
|
flush_dcache_page(fill);
|
|
lock_page(fill);
|
|
|
|
if (!run_lookup_entry(run, 0, &lcn, &clen, &run_idx)) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* TODO: Try blkdev_issue_write_same.
|
|
*/
|
|
blk_start_plug(&plug);
|
|
do {
|
|
lbo = (u64)lcn << cluster_bits;
|
|
len = (u64)clen << cluster_bits;
|
|
new_bio:
|
|
new = bio_alloc(bdev, BIO_MAX_VECS, REQ_OP_WRITE, GFP_NOFS);
|
|
if (bio) {
|
|
bio_chain(bio, new);
|
|
submit_bio(bio);
|
|
}
|
|
bio = new;
|
|
bio->bi_iter.bi_sector = lbo >> 9;
|
|
|
|
for (;;) {
|
|
u32 add = len > PAGE_SIZE ? PAGE_SIZE : len;
|
|
|
|
if (bio_add_page(bio, fill, add, 0) < add)
|
|
goto new_bio;
|
|
|
|
lbo += add;
|
|
if (len <= add)
|
|
break;
|
|
len -= add;
|
|
}
|
|
} while (run_get_entry(run, ++run_idx, NULL, &lcn, &clen));
|
|
|
|
if (!err)
|
|
err = submit_bio_wait(bio);
|
|
bio_put(bio);
|
|
|
|
blk_finish_plug(&plug);
|
|
out:
|
|
unlock_page(fill);
|
|
put_page(fill);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ntfs_vbo_to_lbo(struct ntfs_sb_info *sbi, const struct runs_tree *run,
|
|
u64 vbo, u64 *lbo, u64 *bytes)
|
|
{
|
|
u32 off;
|
|
CLST lcn, len;
|
|
u8 cluster_bits = sbi->cluster_bits;
|
|
|
|
if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, &len, NULL))
|
|
return -ENOENT;
|
|
|
|
off = vbo & sbi->cluster_mask;
|
|
*lbo = lcn == SPARSE_LCN ? -1 : (((u64)lcn << cluster_bits) + off);
|
|
*bytes = ((u64)len << cluster_bits) - off;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ntfs_inode *ntfs_new_inode(struct ntfs_sb_info *sbi, CLST rno,
|
|
enum RECORD_FLAG flag)
|
|
{
|
|
int err = 0;
|
|
struct super_block *sb = sbi->sb;
|
|
struct inode *inode = new_inode(sb);
|
|
struct ntfs_inode *ni;
|
|
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ni = ntfs_i(inode);
|
|
|
|
err = mi_format_new(&ni->mi, sbi, rno, flag, false);
|
|
if (err)
|
|
goto out;
|
|
|
|
inode->i_ino = rno;
|
|
if (insert_inode_locked(inode) < 0) {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (err) {
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
ni = ERR_PTR(err);
|
|
}
|
|
return ni;
|
|
}
|
|
|
|
/*
|
|
* O:BAG:BAD:(A;OICI;FA;;;WD)
|
|
* Owner S-1-5-32-544 (Administrators)
|
|
* Group S-1-5-32-544 (Administrators)
|
|
* ACE: allow S-1-1-0 (Everyone) with FILE_ALL_ACCESS
|
|
*/
|
|
const u8 s_default_security[] __aligned(8) = {
|
|
0x01, 0x00, 0x04, 0x80, 0x30, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x02, 0x00, 0x1C, 0x00,
|
|
0x01, 0x00, 0x00, 0x00, 0x00, 0x03, 0x14, 0x00, 0xFF, 0x01, 0x1F, 0x00,
|
|
0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
|
|
0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x20, 0x00, 0x00, 0x00,
|
|
0x20, 0x02, 0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
|
|
0x20, 0x00, 0x00, 0x00, 0x20, 0x02, 0x00, 0x00,
|
|
};
|
|
|
|
static_assert(sizeof(s_default_security) == 0x50);
|
|
|
|
static inline u32 sid_length(const struct SID *sid)
|
|
{
|
|
return struct_size(sid, SubAuthority, sid->SubAuthorityCount);
|
|
}
|
|
|
|
/*
|
|
* is_acl_valid
|
|
*
|
|
* Thanks Mark Harmstone for idea.
|
|
*/
|
|
static bool is_acl_valid(const struct ACL *acl, u32 len)
|
|
{
|
|
const struct ACE_HEADER *ace;
|
|
u32 i;
|
|
u16 ace_count, ace_size;
|
|
|
|
if (acl->AclRevision != ACL_REVISION &&
|
|
acl->AclRevision != ACL_REVISION_DS) {
|
|
/*
|
|
* This value should be ACL_REVISION, unless the ACL contains an
|
|
* object-specific ACE, in which case this value must be ACL_REVISION_DS.
|
|
* All ACEs in an ACL must be at the same revision level.
|
|
*/
|
|
return false;
|
|
}
|
|
|
|
if (acl->Sbz1)
|
|
return false;
|
|
|
|
if (le16_to_cpu(acl->AclSize) > len)
|
|
return false;
|
|
|
|
if (acl->Sbz2)
|
|
return false;
|
|
|
|
len -= sizeof(struct ACL);
|
|
ace = (struct ACE_HEADER *)&acl[1];
|
|
ace_count = le16_to_cpu(acl->AceCount);
|
|
|
|
for (i = 0; i < ace_count; i++) {
|
|
if (len < sizeof(struct ACE_HEADER))
|
|
return false;
|
|
|
|
ace_size = le16_to_cpu(ace->AceSize);
|
|
if (len < ace_size)
|
|
return false;
|
|
|
|
len -= ace_size;
|
|
ace = Add2Ptr(ace, ace_size);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool is_sd_valid(const struct SECURITY_DESCRIPTOR_RELATIVE *sd, u32 len)
|
|
{
|
|
u32 sd_owner, sd_group, sd_sacl, sd_dacl;
|
|
|
|
if (len < sizeof(struct SECURITY_DESCRIPTOR_RELATIVE))
|
|
return false;
|
|
|
|
if (sd->Revision != 1)
|
|
return false;
|
|
|
|
if (sd->Sbz1)
|
|
return false;
|
|
|
|
if (!(sd->Control & SE_SELF_RELATIVE))
|
|
return false;
|
|
|
|
sd_owner = le32_to_cpu(sd->Owner);
|
|
if (sd_owner) {
|
|
const struct SID *owner = Add2Ptr(sd, sd_owner);
|
|
|
|
if (sd_owner + offsetof(struct SID, SubAuthority) > len)
|
|
return false;
|
|
|
|
if (owner->Revision != 1)
|
|
return false;
|
|
|
|
if (sd_owner + sid_length(owner) > len)
|
|
return false;
|
|
}
|
|
|
|
sd_group = le32_to_cpu(sd->Group);
|
|
if (sd_group) {
|
|
const struct SID *group = Add2Ptr(sd, sd_group);
|
|
|
|
if (sd_group + offsetof(struct SID, SubAuthority) > len)
|
|
return false;
|
|
|
|
if (group->Revision != 1)
|
|
return false;
|
|
|
|
if (sd_group + sid_length(group) > len)
|
|
return false;
|
|
}
|
|
|
|
sd_sacl = le32_to_cpu(sd->Sacl);
|
|
if (sd_sacl) {
|
|
const struct ACL *sacl = Add2Ptr(sd, sd_sacl);
|
|
|
|
if (sd_sacl + sizeof(struct ACL) > len)
|
|
return false;
|
|
|
|
if (!is_acl_valid(sacl, len - sd_sacl))
|
|
return false;
|
|
}
|
|
|
|
sd_dacl = le32_to_cpu(sd->Dacl);
|
|
if (sd_dacl) {
|
|
const struct ACL *dacl = Add2Ptr(sd, sd_dacl);
|
|
|
|
if (sd_dacl + sizeof(struct ACL) > len)
|
|
return false;
|
|
|
|
if (!is_acl_valid(dacl, len - sd_dacl))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* ntfs_security_init - Load and parse $Secure.
|
|
*/
|
|
int ntfs_security_init(struct ntfs_sb_info *sbi)
|
|
{
|
|
int err;
|
|
struct super_block *sb = sbi->sb;
|
|
struct inode *inode;
|
|
struct ntfs_inode *ni;
|
|
struct MFT_REF ref;
|
|
struct ATTRIB *attr;
|
|
struct ATTR_LIST_ENTRY *le;
|
|
u64 sds_size;
|
|
size_t off;
|
|
struct NTFS_DE *ne;
|
|
struct NTFS_DE_SII *sii_e;
|
|
struct ntfs_fnd *fnd_sii = NULL;
|
|
const struct INDEX_ROOT *root_sii;
|
|
const struct INDEX_ROOT *root_sdh;
|
|
struct ntfs_index *indx_sdh = &sbi->security.index_sdh;
|
|
struct ntfs_index *indx_sii = &sbi->security.index_sii;
|
|
|
|
ref.low = cpu_to_le32(MFT_REC_SECURE);
|
|
ref.high = 0;
|
|
ref.seq = cpu_to_le16(MFT_REC_SECURE);
|
|
|
|
inode = ntfs_iget5(sb, &ref, &NAME_SECURE);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
ntfs_err(sb, "Failed to load $Secure (%d).", err);
|
|
inode = NULL;
|
|
goto out;
|
|
}
|
|
|
|
ni = ntfs_i(inode);
|
|
|
|
le = NULL;
|
|
|
|
attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SDH_NAME,
|
|
ARRAY_SIZE(SDH_NAME), NULL, NULL);
|
|
if (!attr ||
|
|
!(root_sdh = resident_data_ex(attr, sizeof(struct INDEX_ROOT))) ||
|
|
root_sdh->type != ATTR_ZERO ||
|
|
root_sdh->rule != NTFS_COLLATION_TYPE_SECURITY_HASH ||
|
|
offsetof(struct INDEX_ROOT, ihdr) +
|
|
le32_to_cpu(root_sdh->ihdr.used) >
|
|
le32_to_cpu(attr->res.data_size)) {
|
|
ntfs_err(sb, "$Secure::$SDH is corrupted.");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = indx_init(indx_sdh, sbi, attr, INDEX_MUTEX_SDH);
|
|
if (err) {
|
|
ntfs_err(sb, "Failed to initialize $Secure::$SDH (%d).", err);
|
|
goto out;
|
|
}
|
|
|
|
attr = ni_find_attr(ni, attr, &le, ATTR_ROOT, SII_NAME,
|
|
ARRAY_SIZE(SII_NAME), NULL, NULL);
|
|
if (!attr ||
|
|
!(root_sii = resident_data_ex(attr, sizeof(struct INDEX_ROOT))) ||
|
|
root_sii->type != ATTR_ZERO ||
|
|
root_sii->rule != NTFS_COLLATION_TYPE_UINT ||
|
|
offsetof(struct INDEX_ROOT, ihdr) +
|
|
le32_to_cpu(root_sii->ihdr.used) >
|
|
le32_to_cpu(attr->res.data_size)) {
|
|
ntfs_err(sb, "$Secure::$SII is corrupted.");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = indx_init(indx_sii, sbi, attr, INDEX_MUTEX_SII);
|
|
if (err) {
|
|
ntfs_err(sb, "Failed to initialize $Secure::$SII (%d).", err);
|
|
goto out;
|
|
}
|
|
|
|
fnd_sii = fnd_get();
|
|
if (!fnd_sii) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
sds_size = inode->i_size;
|
|
|
|
/* Find the last valid Id. */
|
|
sbi->security.next_id = SECURITY_ID_FIRST;
|
|
/* Always write new security at the end of bucket. */
|
|
sbi->security.next_off =
|
|
ALIGN(sds_size - SecurityDescriptorsBlockSize, 16);
|
|
|
|
off = 0;
|
|
ne = NULL;
|
|
|
|
for (;;) {
|
|
u32 next_id;
|
|
|
|
err = indx_find_raw(indx_sii, ni, root_sii, &ne, &off, fnd_sii);
|
|
if (err || !ne)
|
|
break;
|
|
|
|
sii_e = (struct NTFS_DE_SII *)ne;
|
|
if (le16_to_cpu(ne->view.data_size) < sizeof(sii_e->sec_hdr))
|
|
continue;
|
|
|
|
next_id = le32_to_cpu(sii_e->sec_id) + 1;
|
|
if (next_id >= sbi->security.next_id)
|
|
sbi->security.next_id = next_id;
|
|
}
|
|
|
|
sbi->security.ni = ni;
|
|
inode = NULL;
|
|
out:
|
|
iput(inode);
|
|
fnd_put(fnd_sii);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_get_security_by_id - Read security descriptor by id.
|
|
*/
|
|
int ntfs_get_security_by_id(struct ntfs_sb_info *sbi, __le32 security_id,
|
|
struct SECURITY_DESCRIPTOR_RELATIVE **sd,
|
|
size_t *size)
|
|
{
|
|
int err;
|
|
int diff;
|
|
struct ntfs_inode *ni = sbi->security.ni;
|
|
struct ntfs_index *indx = &sbi->security.index_sii;
|
|
void *p = NULL;
|
|
struct NTFS_DE_SII *sii_e;
|
|
struct ntfs_fnd *fnd_sii;
|
|
struct SECURITY_HDR d_security;
|
|
const struct INDEX_ROOT *root_sii;
|
|
u32 t32;
|
|
|
|
*sd = NULL;
|
|
|
|
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_SECURITY);
|
|
|
|
fnd_sii = fnd_get();
|
|
if (!fnd_sii) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
root_sii = indx_get_root(indx, ni, NULL, NULL);
|
|
if (!root_sii) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Try to find this SECURITY descriptor in SII indexes. */
|
|
err = indx_find(indx, ni, root_sii, &security_id, sizeof(security_id),
|
|
NULL, &diff, (struct NTFS_DE **)&sii_e, fnd_sii);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (diff)
|
|
goto out;
|
|
|
|
t32 = le32_to_cpu(sii_e->sec_hdr.size);
|
|
if (t32 < sizeof(struct SECURITY_HDR)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (t32 > sizeof(struct SECURITY_HDR) + 0x10000) {
|
|
/* Looks like too big security. 0x10000 - is arbitrary big number. */
|
|
err = -EFBIG;
|
|
goto out;
|
|
}
|
|
|
|
*size = t32 - sizeof(struct SECURITY_HDR);
|
|
|
|
p = kmalloc(*size, GFP_NOFS);
|
|
if (!p) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = ntfs_read_run_nb(sbi, &ni->file.run,
|
|
le64_to_cpu(sii_e->sec_hdr.off), &d_security,
|
|
sizeof(d_security), NULL);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (memcmp(&d_security, &sii_e->sec_hdr, sizeof(d_security))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = ntfs_read_run_nb(sbi, &ni->file.run,
|
|
le64_to_cpu(sii_e->sec_hdr.off) +
|
|
sizeof(struct SECURITY_HDR),
|
|
p, *size, NULL);
|
|
if (err)
|
|
goto out;
|
|
|
|
*sd = p;
|
|
p = NULL;
|
|
|
|
out:
|
|
kfree(p);
|
|
fnd_put(fnd_sii);
|
|
ni_unlock(ni);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_insert_security - Insert security descriptor into $Secure::SDS.
|
|
*
|
|
* SECURITY Descriptor Stream data is organized into chunks of 256K bytes
|
|
* and it contains a mirror copy of each security descriptor. When writing
|
|
* to a security descriptor at location X, another copy will be written at
|
|
* location (X+256K).
|
|
* When writing a security descriptor that will cross the 256K boundary,
|
|
* the pointer will be advanced by 256K to skip
|
|
* over the mirror portion.
|
|
*/
|
|
int ntfs_insert_security(struct ntfs_sb_info *sbi,
|
|
const struct SECURITY_DESCRIPTOR_RELATIVE *sd,
|
|
u32 size_sd, __le32 *security_id, bool *inserted)
|
|
{
|
|
int err, diff;
|
|
struct ntfs_inode *ni = sbi->security.ni;
|
|
struct ntfs_index *indx_sdh = &sbi->security.index_sdh;
|
|
struct ntfs_index *indx_sii = &sbi->security.index_sii;
|
|
struct NTFS_DE_SDH *e;
|
|
struct NTFS_DE_SDH sdh_e;
|
|
struct NTFS_DE_SII sii_e;
|
|
struct SECURITY_HDR *d_security;
|
|
u32 new_sec_size = size_sd + sizeof(struct SECURITY_HDR);
|
|
u32 aligned_sec_size = ALIGN(new_sec_size, 16);
|
|
struct SECURITY_KEY hash_key;
|
|
struct ntfs_fnd *fnd_sdh = NULL;
|
|
const struct INDEX_ROOT *root_sdh;
|
|
const struct INDEX_ROOT *root_sii;
|
|
u64 mirr_off, new_sds_size;
|
|
u32 next, left;
|
|
|
|
static_assert((1 << Log2OfSecurityDescriptorsBlockSize) ==
|
|
SecurityDescriptorsBlockSize);
|
|
|
|
hash_key.hash = security_hash(sd, size_sd);
|
|
hash_key.sec_id = SECURITY_ID_INVALID;
|
|
|
|
if (inserted)
|
|
*inserted = false;
|
|
*security_id = SECURITY_ID_INVALID;
|
|
|
|
/* Allocate a temporal buffer. */
|
|
d_security = kzalloc(aligned_sec_size, GFP_NOFS);
|
|
if (!d_security)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_SECURITY);
|
|
|
|
fnd_sdh = fnd_get();
|
|
if (!fnd_sdh) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
root_sdh = indx_get_root(indx_sdh, ni, NULL, NULL);
|
|
if (!root_sdh) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
root_sii = indx_get_root(indx_sii, ni, NULL, NULL);
|
|
if (!root_sii) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Check if such security already exists.
|
|
* Use "SDH" and hash -> to get the offset in "SDS".
|
|
*/
|
|
err = indx_find(indx_sdh, ni, root_sdh, &hash_key, sizeof(hash_key),
|
|
&d_security->key.sec_id, &diff, (struct NTFS_DE **)&e,
|
|
fnd_sdh);
|
|
if (err)
|
|
goto out;
|
|
|
|
while (e) {
|
|
if (le32_to_cpu(e->sec_hdr.size) == new_sec_size) {
|
|
err = ntfs_read_run_nb(sbi, &ni->file.run,
|
|
le64_to_cpu(e->sec_hdr.off),
|
|
d_security, new_sec_size, NULL);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (le32_to_cpu(d_security->size) == new_sec_size &&
|
|
d_security->key.hash == hash_key.hash &&
|
|
!memcmp(d_security + 1, sd, size_sd)) {
|
|
*security_id = d_security->key.sec_id;
|
|
/* Such security already exists. */
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
err = indx_find_sort(indx_sdh, ni, root_sdh,
|
|
(struct NTFS_DE **)&e, fnd_sdh);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!e || e->key.hash != hash_key.hash)
|
|
break;
|
|
}
|
|
|
|
/* Zero unused space. */
|
|
next = sbi->security.next_off & (SecurityDescriptorsBlockSize - 1);
|
|
left = SecurityDescriptorsBlockSize - next;
|
|
|
|
/* Zero gap until SecurityDescriptorsBlockSize. */
|
|
if (left < new_sec_size) {
|
|
/* Zero "left" bytes from sbi->security.next_off. */
|
|
sbi->security.next_off += SecurityDescriptorsBlockSize + left;
|
|
}
|
|
|
|
/* Zero tail of previous security. */
|
|
//used = ni->vfs_inode.i_size & (SecurityDescriptorsBlockSize - 1);
|
|
|
|
/*
|
|
* Example:
|
|
* 0x40438 == ni->vfs_inode.i_size
|
|
* 0x00440 == sbi->security.next_off
|
|
* need to zero [0x438-0x440)
|
|
* if (next > used) {
|
|
* u32 tozero = next - used;
|
|
* zero "tozero" bytes from sbi->security.next_off - tozero
|
|
*/
|
|
|
|
/* Format new security descriptor. */
|
|
d_security->key.hash = hash_key.hash;
|
|
d_security->key.sec_id = cpu_to_le32(sbi->security.next_id);
|
|
d_security->off = cpu_to_le64(sbi->security.next_off);
|
|
d_security->size = cpu_to_le32(new_sec_size);
|
|
memcpy(d_security + 1, sd, size_sd);
|
|
|
|
/* Write main SDS bucket. */
|
|
err = ntfs_sb_write_run(sbi, &ni->file.run, sbi->security.next_off,
|
|
d_security, aligned_sec_size, 0);
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
mirr_off = sbi->security.next_off + SecurityDescriptorsBlockSize;
|
|
new_sds_size = mirr_off + aligned_sec_size;
|
|
|
|
if (new_sds_size > ni->vfs_inode.i_size) {
|
|
err = attr_set_size(ni, ATTR_DATA, SDS_NAME,
|
|
ARRAY_SIZE(SDS_NAME), &ni->file.run,
|
|
new_sds_size, &new_sds_size, false, NULL);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
/* Write copy SDS bucket. */
|
|
err = ntfs_sb_write_run(sbi, &ni->file.run, mirr_off, d_security,
|
|
aligned_sec_size, 0);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Fill SII entry. */
|
|
sii_e.de.view.data_off =
|
|
cpu_to_le16(offsetof(struct NTFS_DE_SII, sec_hdr));
|
|
sii_e.de.view.data_size = cpu_to_le16(sizeof(struct SECURITY_HDR));
|
|
sii_e.de.view.res = 0;
|
|
sii_e.de.size = cpu_to_le16(sizeof(struct NTFS_DE_SII));
|
|
sii_e.de.key_size = cpu_to_le16(sizeof(d_security->key.sec_id));
|
|
sii_e.de.flags = 0;
|
|
sii_e.de.res = 0;
|
|
sii_e.sec_id = d_security->key.sec_id;
|
|
memcpy(&sii_e.sec_hdr, d_security, sizeof(struct SECURITY_HDR));
|
|
|
|
err = indx_insert_entry(indx_sii, ni, &sii_e.de, NULL, NULL, 0);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Fill SDH entry. */
|
|
sdh_e.de.view.data_off =
|
|
cpu_to_le16(offsetof(struct NTFS_DE_SDH, sec_hdr));
|
|
sdh_e.de.view.data_size = cpu_to_le16(sizeof(struct SECURITY_HDR));
|
|
sdh_e.de.view.res = 0;
|
|
sdh_e.de.size = cpu_to_le16(SIZEOF_SDH_DIRENTRY);
|
|
sdh_e.de.key_size = cpu_to_le16(sizeof(sdh_e.key));
|
|
sdh_e.de.flags = 0;
|
|
sdh_e.de.res = 0;
|
|
sdh_e.key.hash = d_security->key.hash;
|
|
sdh_e.key.sec_id = d_security->key.sec_id;
|
|
memcpy(&sdh_e.sec_hdr, d_security, sizeof(struct SECURITY_HDR));
|
|
sdh_e.magic[0] = cpu_to_le16('I');
|
|
sdh_e.magic[1] = cpu_to_le16('I');
|
|
|
|
fnd_clear(fnd_sdh);
|
|
err = indx_insert_entry(indx_sdh, ni, &sdh_e.de, (void *)(size_t)1,
|
|
fnd_sdh, 0);
|
|
if (err)
|
|
goto out;
|
|
|
|
*security_id = d_security->key.sec_id;
|
|
if (inserted)
|
|
*inserted = true;
|
|
|
|
/* Update Id and offset for next descriptor. */
|
|
sbi->security.next_id += 1;
|
|
sbi->security.next_off += aligned_sec_size;
|
|
|
|
out:
|
|
fnd_put(fnd_sdh);
|
|
mark_inode_dirty(&ni->vfs_inode);
|
|
ni_unlock(ni);
|
|
kfree(d_security);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_reparse_init - Load and parse $Extend/$Reparse.
|
|
*/
|
|
int ntfs_reparse_init(struct ntfs_sb_info *sbi)
|
|
{
|
|
int err;
|
|
struct ntfs_inode *ni = sbi->reparse.ni;
|
|
struct ntfs_index *indx = &sbi->reparse.index_r;
|
|
struct ATTRIB *attr;
|
|
struct ATTR_LIST_ENTRY *le;
|
|
const struct INDEX_ROOT *root_r;
|
|
|
|
if (!ni)
|
|
return 0;
|
|
|
|
le = NULL;
|
|
attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SR_NAME,
|
|
ARRAY_SIZE(SR_NAME), NULL, NULL);
|
|
if (!attr) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
root_r = resident_data(attr);
|
|
if (root_r->type != ATTR_ZERO ||
|
|
root_r->rule != NTFS_COLLATION_TYPE_UINTS) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = indx_init(indx, sbi, attr, INDEX_MUTEX_SR);
|
|
if (err)
|
|
goto out;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ntfs_objid_init - Load and parse $Extend/$ObjId.
|
|
*/
|
|
int ntfs_objid_init(struct ntfs_sb_info *sbi)
|
|
{
|
|
int err;
|
|
struct ntfs_inode *ni = sbi->objid.ni;
|
|
struct ntfs_index *indx = &sbi->objid.index_o;
|
|
struct ATTRIB *attr;
|
|
struct ATTR_LIST_ENTRY *le;
|
|
const struct INDEX_ROOT *root;
|
|
|
|
if (!ni)
|
|
return 0;
|
|
|
|
le = NULL;
|
|
attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SO_NAME,
|
|
ARRAY_SIZE(SO_NAME), NULL, NULL);
|
|
if (!attr) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
root = resident_data(attr);
|
|
if (root->type != ATTR_ZERO ||
|
|
root->rule != NTFS_COLLATION_TYPE_UINTS) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = indx_init(indx, sbi, attr, INDEX_MUTEX_SO);
|
|
if (err)
|
|
goto out;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int ntfs_objid_remove(struct ntfs_sb_info *sbi, struct GUID *guid)
|
|
{
|
|
int err;
|
|
struct ntfs_inode *ni = sbi->objid.ni;
|
|
struct ntfs_index *indx = &sbi->objid.index_o;
|
|
|
|
if (!ni)
|
|
return -EINVAL;
|
|
|
|
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_OBJID);
|
|
|
|
err = indx_delete_entry(indx, ni, guid, sizeof(*guid), NULL);
|
|
|
|
mark_inode_dirty(&ni->vfs_inode);
|
|
ni_unlock(ni);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ntfs_insert_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
|
|
const struct MFT_REF *ref)
|
|
{
|
|
int err;
|
|
struct ntfs_inode *ni = sbi->reparse.ni;
|
|
struct ntfs_index *indx = &sbi->reparse.index_r;
|
|
struct NTFS_DE_R re;
|
|
|
|
if (!ni)
|
|
return -EINVAL;
|
|
|
|
memset(&re, 0, sizeof(re));
|
|
|
|
re.de.view.data_off = cpu_to_le16(offsetof(struct NTFS_DE_R, zero));
|
|
re.de.size = cpu_to_le16(sizeof(struct NTFS_DE_R));
|
|
re.de.key_size = cpu_to_le16(sizeof(re.key));
|
|
|
|
re.key.ReparseTag = rtag;
|
|
memcpy(&re.key.ref, ref, sizeof(*ref));
|
|
|
|
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_REPARSE);
|
|
|
|
err = indx_insert_entry(indx, ni, &re.de, NULL, NULL, 0);
|
|
|
|
mark_inode_dirty(&ni->vfs_inode);
|
|
ni_unlock(ni);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ntfs_remove_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
|
|
const struct MFT_REF *ref)
|
|
{
|
|
int err, diff;
|
|
struct ntfs_inode *ni = sbi->reparse.ni;
|
|
struct ntfs_index *indx = &sbi->reparse.index_r;
|
|
struct ntfs_fnd *fnd = NULL;
|
|
struct REPARSE_KEY rkey;
|
|
struct NTFS_DE_R *re;
|
|
struct INDEX_ROOT *root_r;
|
|
|
|
if (!ni)
|
|
return -EINVAL;
|
|
|
|
rkey.ReparseTag = rtag;
|
|
rkey.ref = *ref;
|
|
|
|
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_REPARSE);
|
|
|
|
if (rtag) {
|
|
err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL);
|
|
goto out1;
|
|
}
|
|
|
|
fnd = fnd_get();
|
|
if (!fnd) {
|
|
err = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
root_r = indx_get_root(indx, ni, NULL, NULL);
|
|
if (!root_r) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* 1 - forces to ignore rkey.ReparseTag when comparing keys. */
|
|
err = indx_find(indx, ni, root_r, &rkey, sizeof(rkey), (void *)1, &diff,
|
|
(struct NTFS_DE **)&re, fnd);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (memcmp(&re->key.ref, ref, sizeof(*ref))) {
|
|
/* Impossible. Looks like volume corrupt? */
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&rkey, &re->key, sizeof(rkey));
|
|
|
|
fnd_put(fnd);
|
|
fnd = NULL;
|
|
|
|
err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL);
|
|
if (err)
|
|
goto out;
|
|
|
|
out:
|
|
fnd_put(fnd);
|
|
|
|
out1:
|
|
mark_inode_dirty(&ni->vfs_inode);
|
|
ni_unlock(ni);
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void ntfs_unmap_and_discard(struct ntfs_sb_info *sbi, CLST lcn,
|
|
CLST len)
|
|
{
|
|
ntfs_unmap_meta(sbi->sb, lcn, len);
|
|
ntfs_discard(sbi, lcn, len);
|
|
}
|
|
|
|
void mark_as_free_ex(struct ntfs_sb_info *sbi, CLST lcn, CLST len, bool trim)
|
|
{
|
|
CLST end, i, zone_len, zlen;
|
|
struct wnd_bitmap *wnd = &sbi->used.bitmap;
|
|
|
|
down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
|
|
if (!wnd_is_used(wnd, lcn, len)) {
|
|
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
|
|
|
|
end = lcn + len;
|
|
len = 0;
|
|
for (i = lcn; i < end; i++) {
|
|
if (wnd_is_used(wnd, i, 1)) {
|
|
if (!len)
|
|
lcn = i;
|
|
len += 1;
|
|
continue;
|
|
}
|
|
|
|
if (!len)
|
|
continue;
|
|
|
|
if (trim)
|
|
ntfs_unmap_and_discard(sbi, lcn, len);
|
|
|
|
wnd_set_free(wnd, lcn, len);
|
|
len = 0;
|
|
}
|
|
|
|
if (!len)
|
|
goto out;
|
|
}
|
|
|
|
if (trim)
|
|
ntfs_unmap_and_discard(sbi, lcn, len);
|
|
wnd_set_free(wnd, lcn, len);
|
|
|
|
/* append to MFT zone, if possible. */
|
|
zone_len = wnd_zone_len(wnd);
|
|
zlen = min(zone_len + len, sbi->zone_max);
|
|
|
|
if (zlen == zone_len) {
|
|
/* MFT zone already has maximum size. */
|
|
} else if (!zone_len) {
|
|
/* Create MFT zone only if 'zlen' is large enough. */
|
|
if (zlen == sbi->zone_max)
|
|
wnd_zone_set(wnd, lcn, zlen);
|
|
} else {
|
|
CLST zone_lcn = wnd_zone_bit(wnd);
|
|
|
|
if (lcn + len == zone_lcn) {
|
|
/* Append into head MFT zone. */
|
|
wnd_zone_set(wnd, lcn, zlen);
|
|
} else if (zone_lcn + zone_len == lcn) {
|
|
/* Append into tail MFT zone. */
|
|
wnd_zone_set(wnd, zone_lcn, zlen);
|
|
}
|
|
}
|
|
|
|
out:
|
|
up_write(&wnd->rw_lock);
|
|
}
|
|
|
|
/*
|
|
* run_deallocate - Deallocate clusters.
|
|
*/
|
|
int run_deallocate(struct ntfs_sb_info *sbi, const struct runs_tree *run,
|
|
bool trim)
|
|
{
|
|
CLST lcn, len;
|
|
size_t idx = 0;
|
|
|
|
while (run_get_entry(run, idx++, NULL, &lcn, &len)) {
|
|
if (lcn == SPARSE_LCN)
|
|
continue;
|
|
|
|
mark_as_free_ex(sbi, lcn, len, trim);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline bool name_has_forbidden_chars(const struct le_str *fname)
|
|
{
|
|
int i, ch;
|
|
|
|
/* check for forbidden chars */
|
|
for (i = 0; i < fname->len; ++i) {
|
|
ch = le16_to_cpu(fname->name[i]);
|
|
|
|
/* control chars */
|
|
if (ch < 0x20)
|
|
return true;
|
|
|
|
switch (ch) {
|
|
/* disallowed by Windows */
|
|
case '\\':
|
|
case '/':
|
|
case ':':
|
|
case '*':
|
|
case '?':
|
|
case '<':
|
|
case '>':
|
|
case '|':
|
|
case '\"':
|
|
return true;
|
|
|
|
default:
|
|
/* allowed char */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* file names cannot end with space or . */
|
|
if (fname->len > 0) {
|
|
ch = le16_to_cpu(fname->name[fname->len - 1]);
|
|
if (ch == ' ' || ch == '.')
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_reserved_name(const struct ntfs_sb_info *sbi,
|
|
const struct le_str *fname)
|
|
{
|
|
int port_digit;
|
|
const __le16 *name = fname->name;
|
|
int len = fname->len;
|
|
const u16 *upcase = sbi->upcase;
|
|
|
|
/* check for 3 chars reserved names (device names) */
|
|
/* name by itself or with any extension is forbidden */
|
|
if (len == 3 || (len > 3 && le16_to_cpu(name[3]) == '.'))
|
|
if (!ntfs_cmp_names(name, 3, CON_NAME, 3, upcase, false) ||
|
|
!ntfs_cmp_names(name, 3, NUL_NAME, 3, upcase, false) ||
|
|
!ntfs_cmp_names(name, 3, AUX_NAME, 3, upcase, false) ||
|
|
!ntfs_cmp_names(name, 3, PRN_NAME, 3, upcase, false))
|
|
return true;
|
|
|
|
/* check for 4 chars reserved names (port name followed by 1..9) */
|
|
/* name by itself or with any extension is forbidden */
|
|
if (len == 4 || (len > 4 && le16_to_cpu(name[4]) == '.')) {
|
|
port_digit = le16_to_cpu(name[3]);
|
|
if (port_digit >= '1' && port_digit <= '9')
|
|
if (!ntfs_cmp_names(name, 3, COM_NAME, 3, upcase,
|
|
false) ||
|
|
!ntfs_cmp_names(name, 3, LPT_NAME, 3, upcase,
|
|
false))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* valid_windows_name - Check if a file name is valid in Windows.
|
|
*/
|
|
bool valid_windows_name(struct ntfs_sb_info *sbi, const struct le_str *fname)
|
|
{
|
|
return !name_has_forbidden_chars(fname) &&
|
|
!is_reserved_name(sbi, fname);
|
|
}
|
|
|
|
/*
|
|
* ntfs_set_label - updates current ntfs label.
|
|
*/
|
|
int ntfs_set_label(struct ntfs_sb_info *sbi, u8 *label, int len)
|
|
{
|
|
int err;
|
|
struct ATTRIB *attr;
|
|
struct ntfs_inode *ni = sbi->volume.ni;
|
|
const u8 max_ulen = 0x80; /* TODO: use attrdef to get maximum length */
|
|
/* Allocate PATH_MAX bytes. */
|
|
struct cpu_str *uni = __getname();
|
|
|
|
if (!uni)
|
|
return -ENOMEM;
|
|
|
|
err = ntfs_nls_to_utf16(sbi, label, len, uni, (PATH_MAX - 2) / 2,
|
|
UTF16_LITTLE_ENDIAN);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
if (uni->len > max_ulen) {
|
|
ntfs_warn(sbi->sb, "new label is too long");
|
|
err = -EFBIG;
|
|
goto out;
|
|
}
|
|
|
|
ni_lock(ni);
|
|
|
|
/* Ignore any errors. */
|
|
ni_remove_attr(ni, ATTR_LABEL, NULL, 0, false, NULL);
|
|
|
|
err = ni_insert_resident(ni, uni->len * sizeof(u16), ATTR_LABEL, NULL,
|
|
0, &attr, NULL, NULL);
|
|
if (err < 0)
|
|
goto unlock_out;
|
|
|
|
/* write new label in on-disk struct. */
|
|
memcpy(resident_data(attr), uni->name, uni->len * sizeof(u16));
|
|
|
|
/* update cached value of current label. */
|
|
if (len >= ARRAY_SIZE(sbi->volume.label))
|
|
len = ARRAY_SIZE(sbi->volume.label) - 1;
|
|
memcpy(sbi->volume.label, label, len);
|
|
sbi->volume.label[len] = 0;
|
|
mark_inode_dirty_sync(&ni->vfs_inode);
|
|
|
|
unlock_out:
|
|
ni_unlock(ni);
|
|
|
|
if (!err)
|
|
err = _ni_write_inode(&ni->vfs_inode, 0);
|
|
|
|
out:
|
|
__putname(uni);
|
|
return err;
|
|
} |