fs/ntfs3: Add file operations and implementation
This adds file operations and implementation Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov
Родитель
3f3b442b5a
Коммит
4342306f0f
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@ -0,0 +1,596 @@
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// 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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* directory handling functions for ntfs-based filesystems
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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/iversion.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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/*
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* Convert little endian utf16 to nls string
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*/
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int ntfs_utf16_to_nls(struct ntfs_sb_info *sbi, const struct le_str *uni,
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u8 *buf, int buf_len)
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{
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int ret, uni_len, warn;
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const __le16 *ip;
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u8 *op;
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struct nls_table *nls = sbi->options.nls;
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static_assert(sizeof(wchar_t) == sizeof(__le16));
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if (!nls) {
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/* utf16 -> utf8 */
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ret = utf16s_to_utf8s((wchar_t *)uni->name, uni->len,
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UTF16_LITTLE_ENDIAN, buf, buf_len);
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buf[ret] = '\0';
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return ret;
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}
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ip = uni->name;
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op = buf;
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uni_len = uni->len;
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warn = 0;
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while (uni_len--) {
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u16 ec;
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int charlen;
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char dump[5];
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if (buf_len < NLS_MAX_CHARSET_SIZE) {
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ntfs_warn(sbi->sb,
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"filename was truncated while converting.");
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break;
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}
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ec = le16_to_cpu(*ip++);
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charlen = nls->uni2char(ec, op, buf_len);
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if (charlen > 0) {
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op += charlen;
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buf_len -= charlen;
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continue;
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}
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*op++ = '_';
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buf_len -= 1;
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if (warn)
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continue;
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warn = 1;
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hex_byte_pack(&dump[0], ec >> 8);
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hex_byte_pack(&dump[2], ec);
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dump[4] = 0;
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ntfs_err(sbi->sb, "failed to convert \"%s\" to %s", dump,
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nls->charset);
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}
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*op = '\0';
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return op - buf;
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}
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// clang-format off
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#define PLANE_SIZE 0x00010000
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#define SURROGATE_PAIR 0x0000d800
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#define SURROGATE_LOW 0x00000400
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#define SURROGATE_BITS 0x000003ff
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// clang-format on
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/*
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* modified version of put_utf16 from fs/nls/nls_base.c
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* is sparse warnings free
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*/
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static inline void put_utf16(wchar_t *s, unsigned int c,
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enum utf16_endian endian)
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{
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static_assert(sizeof(wchar_t) == sizeof(__le16));
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static_assert(sizeof(wchar_t) == sizeof(__be16));
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switch (endian) {
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default:
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*s = (wchar_t)c;
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break;
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case UTF16_LITTLE_ENDIAN:
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*(__le16 *)s = __cpu_to_le16(c);
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break;
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case UTF16_BIG_ENDIAN:
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*(__be16 *)s = __cpu_to_be16(c);
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break;
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}
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}
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/*
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* modified version of 'utf8s_to_utf16s' allows to
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* detect -ENAMETOOLONG without writing out of expected maximum
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*/
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static int _utf8s_to_utf16s(const u8 *s, int inlen, enum utf16_endian endian,
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wchar_t *pwcs, int maxout)
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{
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u16 *op;
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int size;
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unicode_t u;
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op = pwcs;
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while (inlen > 0 && *s) {
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if (*s & 0x80) {
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size = utf8_to_utf32(s, inlen, &u);
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if (size < 0)
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return -EINVAL;
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s += size;
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inlen -= size;
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if (u >= PLANE_SIZE) {
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if (maxout < 2)
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return -ENAMETOOLONG;
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u -= PLANE_SIZE;
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put_utf16(op++,
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SURROGATE_PAIR |
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((u >> 10) & SURROGATE_BITS),
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endian);
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put_utf16(op++,
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SURROGATE_PAIR | SURROGATE_LOW |
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(u & SURROGATE_BITS),
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endian);
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maxout -= 2;
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} else {
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if (maxout < 1)
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return -ENAMETOOLONG;
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put_utf16(op++, u, endian);
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maxout--;
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}
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} else {
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if (maxout < 1)
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return -ENAMETOOLONG;
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put_utf16(op++, *s++, endian);
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inlen--;
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maxout--;
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}
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}
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return op - pwcs;
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}
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/*
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* Convert input string to utf16
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*
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* name, name_len - input name
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* uni, max_ulen - destination memory
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* endian - endian of target utf16 string
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*
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* This function is called:
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* - to create ntfs name
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* - to create symlink
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*
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* returns utf16 string length or error (if negative)
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*/
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int ntfs_nls_to_utf16(struct ntfs_sb_info *sbi, const u8 *name, u32 name_len,
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struct cpu_str *uni, u32 max_ulen,
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enum utf16_endian endian)
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{
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int ret, slen;
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const u8 *end;
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struct nls_table *nls = sbi->options.nls;
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u16 *uname = uni->name;
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static_assert(sizeof(wchar_t) == sizeof(u16));
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if (!nls) {
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/* utf8 -> utf16 */
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ret = _utf8s_to_utf16s(name, name_len, endian, uname, max_ulen);
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uni->len = ret;
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return ret;
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}
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for (ret = 0, end = name + name_len; name < end; ret++, name += slen) {
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if (ret >= max_ulen)
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return -ENAMETOOLONG;
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slen = nls->char2uni(name, end - name, uname + ret);
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if (!slen)
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return -EINVAL;
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if (slen < 0)
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return slen;
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}
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#ifdef __BIG_ENDIAN
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if (endian == UTF16_LITTLE_ENDIAN) {
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int i = ret;
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while (i--) {
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__cpu_to_le16s(uname);
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uname++;
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}
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}
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#else
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if (endian == UTF16_BIG_ENDIAN) {
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int i = ret;
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while (i--) {
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__cpu_to_be16s(uname);
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uname++;
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}
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}
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#endif
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uni->len = ret;
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return ret;
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}
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/* helper function */
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struct inode *dir_search_u(struct inode *dir, const struct cpu_str *uni,
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struct ntfs_fnd *fnd)
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{
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int err = 0;
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struct super_block *sb = dir->i_sb;
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struct ntfs_sb_info *sbi = sb->s_fs_info;
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struct ntfs_inode *ni = ntfs_i(dir);
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struct NTFS_DE *e;
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int diff;
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struct inode *inode = NULL;
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struct ntfs_fnd *fnd_a = NULL;
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if (!fnd) {
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fnd_a = fnd_get();
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if (!fnd_a) {
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err = -ENOMEM;
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goto out;
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}
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fnd = fnd_a;
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}
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err = indx_find(&ni->dir, ni, NULL, uni, 0, sbi, &diff, &e, fnd);
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if (err)
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goto out;
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if (diff) {
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err = -ENOENT;
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goto out;
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}
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inode = ntfs_iget5(sb, &e->ref, uni);
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if (!IS_ERR(inode) && is_bad_inode(inode)) {
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iput(inode);
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err = -EINVAL;
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}
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out:
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fnd_put(fnd_a);
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return err == -ENOENT ? NULL : err ? ERR_PTR(err) : inode;
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}
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static inline int ntfs_filldir(struct ntfs_sb_info *sbi, struct ntfs_inode *ni,
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const struct NTFS_DE *e, u8 *name,
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struct dir_context *ctx)
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{
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const struct ATTR_FILE_NAME *fname;
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unsigned long ino;
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int name_len;
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u32 dt_type;
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fname = Add2Ptr(e, sizeof(struct NTFS_DE));
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if (fname->type == FILE_NAME_DOS)
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return 0;
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if (!mi_is_ref(&ni->mi, &fname->home))
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return 0;
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ino = ino_get(&e->ref);
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if (ino == MFT_REC_ROOT)
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return 0;
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/* Skip meta files ( unless option to show metafiles is set ) */
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if (!sbi->options.showmeta && ntfs_is_meta_file(sbi, ino))
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return 0;
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if (sbi->options.nohidden && (fname->dup.fa & FILE_ATTRIBUTE_HIDDEN))
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return 0;
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name_len = ntfs_utf16_to_nls(sbi, (struct le_str *)&fname->name_len,
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name, PATH_MAX);
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if (name_len <= 0) {
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ntfs_warn(sbi->sb, "failed to convert name for inode %lx.",
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ino);
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return 0;
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}
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dt_type = (fname->dup.fa & FILE_ATTRIBUTE_DIRECTORY) ? DT_DIR : DT_REG;
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return !dir_emit(ctx, (s8 *)name, name_len, ino, dt_type);
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}
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/*
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* ntfs_read_hdr
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*
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* helper function 'ntfs_readdir'
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*/
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static int ntfs_read_hdr(struct ntfs_sb_info *sbi, struct ntfs_inode *ni,
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const struct INDEX_HDR *hdr, u64 vbo, u64 pos,
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u8 *name, struct dir_context *ctx)
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{
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int err;
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const struct NTFS_DE *e;
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u32 e_size;
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u32 end = le32_to_cpu(hdr->used);
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u32 off = le32_to_cpu(hdr->de_off);
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for (;; off += e_size) {
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if (off + sizeof(struct NTFS_DE) > end)
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return -1;
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e = Add2Ptr(hdr, off);
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e_size = le16_to_cpu(e->size);
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if (e_size < sizeof(struct NTFS_DE) || off + e_size > end)
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return -1;
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if (de_is_last(e))
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return 0;
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/* Skip already enumerated*/
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if (vbo + off < pos)
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continue;
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if (le16_to_cpu(e->key_size) < SIZEOF_ATTRIBUTE_FILENAME)
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return -1;
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ctx->pos = vbo + off;
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/* Submit the name to the filldir callback. */
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err = ntfs_filldir(sbi, ni, e, name, ctx);
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if (err)
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return err;
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}
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}
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|
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/*
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* file_operations::iterate_shared
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*
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* Use non sorted enumeration.
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* We have an example of broken volume where sorted enumeration
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* counts each name twice
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*/
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static int ntfs_readdir(struct file *file, struct dir_context *ctx)
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{
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const struct INDEX_ROOT *root;
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u64 vbo;
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size_t bit;
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loff_t eod;
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int err = 0;
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struct inode *dir = file_inode(file);
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struct ntfs_inode *ni = ntfs_i(dir);
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struct super_block *sb = dir->i_sb;
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struct ntfs_sb_info *sbi = sb->s_fs_info;
|
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loff_t i_size = i_size_read(dir);
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u32 pos = ctx->pos;
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u8 *name = NULL;
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struct indx_node *node = NULL;
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u8 index_bits = ni->dir.index_bits;
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/* name is a buffer of PATH_MAX length */
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static_assert(NTFS_NAME_LEN * 4 < PATH_MAX);
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|
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eod = i_size + sbi->record_size;
|
||||
|
||||
if (pos >= eod)
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return 0;
|
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|
||||
if (!dir_emit_dots(file, ctx))
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return 0;
|
||||
|
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/* allocate PATH_MAX bytes */
|
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name = __getname();
|
||||
if (!name)
|
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return -ENOMEM;
|
||||
|
||||
if (!ni->mi_loaded && ni->attr_list.size) {
|
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/*
|
||||
* directory inode is locked for read
|
||||
* load all subrecords to avoid 'write' access to 'ni' during
|
||||
* directory reading
|
||||
*/
|
||||
ni_lock(ni);
|
||||
if (!ni->mi_loaded && ni->attr_list.size) {
|
||||
err = ni_load_all_mi(ni);
|
||||
if (!err)
|
||||
ni->mi_loaded = true;
|
||||
}
|
||||
ni_unlock(ni);
|
||||
if (err)
|
||||
goto out;
|
||||
}
|
||||
|
||||
root = indx_get_root(&ni->dir, ni, NULL, NULL);
|
||||
if (!root) {
|
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err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (pos >= sbi->record_size) {
|
||||
bit = (pos - sbi->record_size) >> index_bits;
|
||||
} else {
|
||||
err = ntfs_read_hdr(sbi, ni, &root->ihdr, 0, pos, name, ctx);
|
||||
if (err)
|
||||
goto out;
|
||||
bit = 0;
|
||||
}
|
||||
|
||||
if (!i_size) {
|
||||
ctx->pos = eod;
|
||||
goto out;
|
||||
}
|
||||
|
||||
for (;;) {
|
||||
vbo = (u64)bit << index_bits;
|
||||
if (vbo >= i_size) {
|
||||
ctx->pos = eod;
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = indx_used_bit(&ni->dir, ni, &bit);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
if (bit == MINUS_ONE_T) {
|
||||
ctx->pos = eod;
|
||||
goto out;
|
||||
}
|
||||
|
||||
vbo = (u64)bit << index_bits;
|
||||
if (vbo >= i_size) {
|
||||
ntfs_inode_err(dir, "Looks like your dir is corrupt");
|
||||
err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = indx_read(&ni->dir, ni, bit << ni->dir.idx2vbn_bits,
|
||||
&node);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = ntfs_read_hdr(sbi, ni, &node->index->ihdr,
|
||||
vbo + sbi->record_size, pos, name, ctx);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
bit += 1;
|
||||
}
|
||||
|
||||
out:
|
||||
|
||||
__putname(name);
|
||||
put_indx_node(node);
|
||||
|
||||
if (err == -ENOENT) {
|
||||
err = 0;
|
||||
ctx->pos = pos;
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ntfs_dir_count(struct inode *dir, bool *is_empty, size_t *dirs,
|
||||
size_t *files)
|
||||
{
|
||||
int err = 0;
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
struct NTFS_DE *e = NULL;
|
||||
struct INDEX_ROOT *root;
|
||||
struct INDEX_HDR *hdr;
|
||||
const struct ATTR_FILE_NAME *fname;
|
||||
u32 e_size, off, end;
|
||||
u64 vbo = 0;
|
||||
size_t drs = 0, fles = 0, bit = 0;
|
||||
loff_t i_size = ni->vfs_inode.i_size;
|
||||
struct indx_node *node = NULL;
|
||||
u8 index_bits = ni->dir.index_bits;
|
||||
|
||||
if (is_empty)
|
||||
*is_empty = true;
|
||||
|
||||
root = indx_get_root(&ni->dir, ni, NULL, NULL);
|
||||
if (!root)
|
||||
return -EINVAL;
|
||||
|
||||
hdr = &root->ihdr;
|
||||
|
||||
for (;;) {
|
||||
end = le32_to_cpu(hdr->used);
|
||||
off = le32_to_cpu(hdr->de_off);
|
||||
|
||||
for (; off + sizeof(struct NTFS_DE) <= end; off += e_size) {
|
||||
e = Add2Ptr(hdr, off);
|
||||
e_size = le16_to_cpu(e->size);
|
||||
if (e_size < sizeof(struct NTFS_DE) ||
|
||||
off + e_size > end)
|
||||
break;
|
||||
|
||||
if (de_is_last(e))
|
||||
break;
|
||||
|
||||
fname = de_get_fname(e);
|
||||
if (!fname)
|
||||
continue;
|
||||
|
||||
if (fname->type == FILE_NAME_DOS)
|
||||
continue;
|
||||
|
||||
if (is_empty) {
|
||||
*is_empty = false;
|
||||
if (!dirs && !files)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (fname->dup.fa & FILE_ATTRIBUTE_DIRECTORY)
|
||||
drs += 1;
|
||||
else
|
||||
fles += 1;
|
||||
}
|
||||
|
||||
if (vbo >= i_size)
|
||||
goto out;
|
||||
|
||||
err = indx_used_bit(&ni->dir, ni, &bit);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
if (bit == MINUS_ONE_T)
|
||||
goto out;
|
||||
|
||||
vbo = (u64)bit << index_bits;
|
||||
if (vbo >= i_size)
|
||||
goto out;
|
||||
|
||||
err = indx_read(&ni->dir, ni, bit << ni->dir.idx2vbn_bits,
|
||||
&node);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
hdr = &node->index->ihdr;
|
||||
bit += 1;
|
||||
vbo = (u64)bit << ni->dir.idx2vbn_bits;
|
||||
}
|
||||
|
||||
out:
|
||||
put_indx_node(node);
|
||||
if (dirs)
|
||||
*dirs = drs;
|
||||
if (files)
|
||||
*files = fles;
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
bool dir_is_empty(struct inode *dir)
|
||||
{
|
||||
bool is_empty = false;
|
||||
|
||||
ntfs_dir_count(dir, &is_empty, NULL, NULL);
|
||||
|
||||
return is_empty;
|
||||
}
|
||||
|
||||
// clang-format off
|
||||
const struct file_operations ntfs_dir_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = generic_read_dir,
|
||||
.iterate_shared = ntfs_readdir,
|
||||
.fsync = generic_file_fsync,
|
||||
.open = ntfs_file_open,
|
||||
};
|
||||
// clang-format on
|
||||
Разница между файлами не показана из-за своего большого размера
Загрузить разницу
Разница между файлами не показана из-за своего большого размера
Загрузить разницу
|
|
@ -0,0 +1,539 @@
|
|||
// 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/iversion.h>
|
||||
#include <linux/namei.h>
|
||||
#include <linux/nls.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "ntfs.h"
|
||||
#include "ntfs_fs.h"
|
||||
|
||||
/*
|
||||
* fill_name_de
|
||||
*
|
||||
* formats NTFS_DE in 'buf'
|
||||
*/
|
||||
int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
|
||||
const struct cpu_str *uni)
|
||||
{
|
||||
int err;
|
||||
struct NTFS_DE *e = buf;
|
||||
u16 data_size;
|
||||
struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1);
|
||||
|
||||
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
|
||||
e->ref.high = fname->home.high = 0;
|
||||
#endif
|
||||
if (uni) {
|
||||
#ifdef __BIG_ENDIAN
|
||||
int ulen = uni->len;
|
||||
__le16 *uname = fname->name;
|
||||
const u16 *name_cpu = uni->name;
|
||||
|
||||
while (ulen--)
|
||||
*uname++ = cpu_to_le16(*name_cpu++);
|
||||
#else
|
||||
memcpy(fname->name, uni->name, uni->len * sizeof(u16));
|
||||
#endif
|
||||
fname->name_len = uni->len;
|
||||
|
||||
} else {
|
||||
/* Convert input string to unicode */
|
||||
err = ntfs_nls_to_utf16(sbi, name->name, name->len,
|
||||
(struct cpu_str *)&fname->name_len,
|
||||
NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
|
||||
if (err < 0)
|
||||
return err;
|
||||
}
|
||||
|
||||
fname->type = FILE_NAME_POSIX;
|
||||
data_size = fname_full_size(fname);
|
||||
|
||||
e->size = cpu_to_le16(QuadAlign(data_size) + sizeof(struct NTFS_DE));
|
||||
e->key_size = cpu_to_le16(data_size);
|
||||
e->flags = 0;
|
||||
e->res = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_lookup
|
||||
*
|
||||
* inode_operations::lookup
|
||||
*/
|
||||
static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
|
||||
u32 flags)
|
||||
{
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
struct cpu_str *uni = __getname();
|
||||
struct inode *inode;
|
||||
int err;
|
||||
|
||||
if (!uni)
|
||||
inode = ERR_PTR(-ENOMEM);
|
||||
else {
|
||||
err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
|
||||
dentry->d_name.len, uni, NTFS_NAME_LEN,
|
||||
UTF16_HOST_ENDIAN);
|
||||
if (err < 0)
|
||||
inode = ERR_PTR(err);
|
||||
else {
|
||||
ni_lock(ni);
|
||||
inode = dir_search_u(dir, uni, NULL);
|
||||
ni_unlock(ni);
|
||||
}
|
||||
__putname(uni);
|
||||
}
|
||||
|
||||
return d_splice_alias(inode, dentry);
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_create
|
||||
*
|
||||
* inode_operations::create
|
||||
*/
|
||||
static int ntfs_create(struct user_namespace *mnt_userns, struct inode *dir,
|
||||
struct dentry *dentry, umode_t mode, bool excl)
|
||||
{
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
struct inode *inode;
|
||||
|
||||
ni_lock_dir(ni);
|
||||
|
||||
inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG | mode,
|
||||
0, NULL, 0, NULL);
|
||||
|
||||
ni_unlock(ni);
|
||||
|
||||
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_mknod
|
||||
*
|
||||
* inode_operations::mknod
|
||||
*/
|
||||
static int ntfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
|
||||
struct dentry *dentry, umode_t mode, dev_t rdev)
|
||||
{
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
struct inode *inode;
|
||||
|
||||
ni_lock_dir(ni);
|
||||
|
||||
inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev,
|
||||
NULL, 0, NULL);
|
||||
|
||||
ni_unlock(ni);
|
||||
|
||||
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_link
|
||||
*
|
||||
* inode_operations::link
|
||||
*/
|
||||
static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
|
||||
{
|
||||
int err;
|
||||
struct inode *inode = d_inode(ode);
|
||||
struct ntfs_inode *ni = ntfs_i(inode);
|
||||
|
||||
if (S_ISDIR(inode->i_mode))
|
||||
return -EPERM;
|
||||
|
||||
if (inode->i_nlink >= NTFS_LINK_MAX)
|
||||
return -EMLINK;
|
||||
|
||||
ni_lock_dir(ntfs_i(dir));
|
||||
if (inode != dir)
|
||||
ni_lock(ni);
|
||||
|
||||
dir->i_ctime = dir->i_mtime = inode->i_ctime = current_time(inode);
|
||||
inc_nlink(inode);
|
||||
ihold(inode);
|
||||
|
||||
err = ntfs_link_inode(inode, de);
|
||||
if (!err) {
|
||||
mark_inode_dirty(inode);
|
||||
mark_inode_dirty(dir);
|
||||
d_instantiate(de, inode);
|
||||
} else {
|
||||
drop_nlink(inode);
|
||||
iput(inode);
|
||||
}
|
||||
|
||||
if (inode != dir)
|
||||
ni_unlock(ni);
|
||||
ni_unlock(ntfs_i(dir));
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_unlink
|
||||
*
|
||||
* inode_operations::unlink
|
||||
*/
|
||||
static int ntfs_unlink(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
int err;
|
||||
|
||||
ni_lock_dir(ni);
|
||||
|
||||
err = ntfs_unlink_inode(dir, dentry);
|
||||
|
||||
ni_unlock(ni);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_symlink
|
||||
*
|
||||
* inode_operations::symlink
|
||||
*/
|
||||
static int ntfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
|
||||
struct dentry *dentry, const char *symname)
|
||||
{
|
||||
u32 size = strlen(symname);
|
||||
struct inode *inode;
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
|
||||
ni_lock_dir(ni);
|
||||
|
||||
inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK | 0777,
|
||||
0, symname, size, NULL);
|
||||
|
||||
ni_unlock(ni);
|
||||
|
||||
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_mkdir
|
||||
*
|
||||
* inode_operations::mkdir
|
||||
*/
|
||||
static int ntfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
|
||||
struct dentry *dentry, umode_t mode)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
|
||||
ni_lock_dir(ni);
|
||||
|
||||
inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR | mode,
|
||||
0, NULL, 0, NULL);
|
||||
|
||||
ni_unlock(ni);
|
||||
|
||||
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_rmdir
|
||||
*
|
||||
* inode_operations::rm_dir
|
||||
*/
|
||||
static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
int err;
|
||||
|
||||
ni_lock_dir(ni);
|
||||
|
||||
err = ntfs_unlink_inode(dir, dentry);
|
||||
|
||||
ni_unlock(ni);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_rename
|
||||
*
|
||||
* inode_operations::rename
|
||||
*/
|
||||
static int ntfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
|
||||
struct dentry *old_dentry, struct inode *new_dir,
|
||||
struct dentry *new_dentry, u32 flags)
|
||||
{
|
||||
int err;
|
||||
struct super_block *sb = old_dir->i_sb;
|
||||
struct ntfs_sb_info *sbi = sb->s_fs_info;
|
||||
struct ntfs_inode *old_dir_ni = ntfs_i(old_dir);
|
||||
struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
|
||||
struct ntfs_inode *old_ni;
|
||||
struct ATTR_FILE_NAME *old_name, *new_name, *fname;
|
||||
u8 name_type;
|
||||
bool is_same;
|
||||
struct inode *old_inode, *new_inode;
|
||||
struct NTFS_DE *old_de, *new_de;
|
||||
struct ATTRIB *attr;
|
||||
struct ATTR_LIST_ENTRY *le;
|
||||
u16 new_de_key_size;
|
||||
|
||||
static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
|
||||
static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
|
||||
1024);
|
||||
static_assert(PATH_MAX >= 4 * 1024);
|
||||
|
||||
if (flags & ~RENAME_NOREPLACE)
|
||||
return -EINVAL;
|
||||
|
||||
old_inode = d_inode(old_dentry);
|
||||
new_inode = d_inode(new_dentry);
|
||||
|
||||
old_ni = ntfs_i(old_inode);
|
||||
|
||||
is_same = old_dentry->d_name.len == new_dentry->d_name.len &&
|
||||
!memcmp(old_dentry->d_name.name, new_dentry->d_name.name,
|
||||
old_dentry->d_name.len);
|
||||
|
||||
if (is_same && old_dir == new_dir) {
|
||||
/* Nothing to do */
|
||||
err = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (ntfs_is_meta_file(sbi, old_inode->i_ino)) {
|
||||
err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (new_inode) {
|
||||
/*target name exists. unlink it*/
|
||||
dget(new_dentry);
|
||||
ni_lock_dir(new_dir_ni);
|
||||
err = ntfs_unlink_inode(new_dir, new_dentry);
|
||||
ni_unlock(new_dir_ni);
|
||||
dput(new_dentry);
|
||||
if (err)
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* allocate PATH_MAX bytes */
|
||||
old_de = __getname();
|
||||
if (!old_de) {
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
err = fill_name_de(sbi, old_de, &old_dentry->d_name, NULL);
|
||||
if (err < 0)
|
||||
goto out1;
|
||||
|
||||
old_name = (struct ATTR_FILE_NAME *)(old_de + 1);
|
||||
|
||||
if (is_same) {
|
||||
new_de = old_de;
|
||||
} else {
|
||||
new_de = Add2Ptr(old_de, 1024);
|
||||
err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
|
||||
if (err < 0)
|
||||
goto out1;
|
||||
}
|
||||
|
||||
ni_lock_dir(old_dir_ni);
|
||||
ni_lock(old_ni);
|
||||
|
||||
mi_get_ref(&old_dir_ni->mi, &old_name->home);
|
||||
|
||||
/*get pointer to file_name in mft*/
|
||||
fname = ni_fname_name(old_ni, (struct cpu_str *)&old_name->name_len,
|
||||
&old_name->home, &le);
|
||||
if (!fname) {
|
||||
err = -EINVAL;
|
||||
goto out2;
|
||||
}
|
||||
|
||||
/* Copy fname info from record into new fname */
|
||||
new_name = (struct ATTR_FILE_NAME *)(new_de + 1);
|
||||
memcpy(&new_name->dup, &fname->dup, sizeof(fname->dup));
|
||||
|
||||
name_type = paired_name(fname->type);
|
||||
|
||||
/* remove first name from directory */
|
||||
err = indx_delete_entry(&old_dir_ni->dir, old_dir_ni, old_de + 1,
|
||||
le16_to_cpu(old_de->key_size), sbi);
|
||||
if (err)
|
||||
goto out3;
|
||||
|
||||
/* remove first name from mft */
|
||||
err = ni_remove_attr_le(old_ni, attr_from_name(fname), le);
|
||||
if (err)
|
||||
goto out4;
|
||||
|
||||
le16_add_cpu(&old_ni->mi.mrec->hard_links, -1);
|
||||
old_ni->mi.dirty = true;
|
||||
|
||||
if (name_type != FILE_NAME_POSIX) {
|
||||
/* get paired name */
|
||||
fname = ni_fname_type(old_ni, name_type, &le);
|
||||
if (fname) {
|
||||
/* remove second name from directory */
|
||||
err = indx_delete_entry(&old_dir_ni->dir, old_dir_ni,
|
||||
fname, fname_full_size(fname),
|
||||
sbi);
|
||||
if (err)
|
||||
goto out5;
|
||||
|
||||
/* remove second name from mft */
|
||||
err = ni_remove_attr_le(old_ni, attr_from_name(fname),
|
||||
le);
|
||||
if (err)
|
||||
goto out6;
|
||||
|
||||
le16_add_cpu(&old_ni->mi.mrec->hard_links, -1);
|
||||
old_ni->mi.dirty = true;
|
||||
}
|
||||
}
|
||||
|
||||
/* Add new name */
|
||||
mi_get_ref(&old_ni->mi, &new_de->ref);
|
||||
mi_get_ref(&ntfs_i(new_dir)->mi, &new_name->home);
|
||||
|
||||
new_de_key_size = le16_to_cpu(new_de->key_size);
|
||||
|
||||
/* insert new name in mft */
|
||||
err = ni_insert_resident(old_ni, new_de_key_size, ATTR_NAME, NULL, 0,
|
||||
&attr, NULL);
|
||||
if (err)
|
||||
goto out7;
|
||||
|
||||
attr->res.flags = RESIDENT_FLAG_INDEXED;
|
||||
|
||||
memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), new_name, new_de_key_size);
|
||||
|
||||
le16_add_cpu(&old_ni->mi.mrec->hard_links, 1);
|
||||
old_ni->mi.dirty = true;
|
||||
|
||||
/* insert new name in directory */
|
||||
err = indx_insert_entry(&new_dir_ni->dir, new_dir_ni, new_de, sbi,
|
||||
NULL);
|
||||
if (err)
|
||||
goto out8;
|
||||
|
||||
if (IS_DIRSYNC(new_dir))
|
||||
err = ntfs_sync_inode(old_inode);
|
||||
else
|
||||
mark_inode_dirty(old_inode);
|
||||
|
||||
old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
|
||||
if (IS_DIRSYNC(old_dir))
|
||||
(void)ntfs_sync_inode(old_dir);
|
||||
else
|
||||
mark_inode_dirty(old_dir);
|
||||
|
||||
if (old_dir != new_dir) {
|
||||
new_dir->i_mtime = new_dir->i_ctime = old_dir->i_ctime;
|
||||
mark_inode_dirty(new_dir);
|
||||
}
|
||||
|
||||
if (old_inode) {
|
||||
old_inode->i_ctime = old_dir->i_ctime;
|
||||
mark_inode_dirty(old_inode);
|
||||
}
|
||||
|
||||
err = 0;
|
||||
/* normal way */
|
||||
goto out2;
|
||||
|
||||
out8:
|
||||
/* undo
|
||||
* ni_insert_resident(old_ni, new_de_key_size, ATTR_NAME, NULL, 0,
|
||||
* &attr, NULL);
|
||||
*/
|
||||
mi_remove_attr(&old_ni->mi, attr);
|
||||
out7:
|
||||
/* undo
|
||||
* ni_remove_attr_le(old_ni, attr_from_name(fname), le);
|
||||
*/
|
||||
out6:
|
||||
/* undo
|
||||
* indx_delete_entry(&old_dir_ni->dir, old_dir_ni,
|
||||
* fname, fname_full_size(fname),
|
||||
* sbi);
|
||||
*/
|
||||
out5:
|
||||
/* undo
|
||||
* ni_remove_attr_le(old_ni, attr_from_name(fname), le);
|
||||
*/
|
||||
out4:
|
||||
/* undo:
|
||||
* indx_delete_entry(&old_dir_ni->dir, old_dir_ni, old_de + 1,
|
||||
* old_de->key_size, NULL);
|
||||
*/
|
||||
out3:
|
||||
out2:
|
||||
ni_unlock(old_ni);
|
||||
ni_unlock(old_dir_ni);
|
||||
out1:
|
||||
__putname(old_de);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
struct dentry *ntfs3_get_parent(struct dentry *child)
|
||||
{
|
||||
struct inode *inode = d_inode(child);
|
||||
struct ntfs_inode *ni = ntfs_i(inode);
|
||||
|
||||
struct ATTR_LIST_ENTRY *le = NULL;
|
||||
struct ATTRIB *attr = NULL;
|
||||
struct ATTR_FILE_NAME *fname;
|
||||
|
||||
while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
|
||||
NULL))) {
|
||||
fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
|
||||
if (!fname)
|
||||
continue;
|
||||
|
||||
return d_obtain_alias(
|
||||
ntfs_iget5(inode->i_sb, &fname->home, NULL));
|
||||
}
|
||||
|
||||
return ERR_PTR(-ENOENT);
|
||||
}
|
||||
|
||||
// clang-format off
|
||||
const struct inode_operations ntfs_dir_inode_operations = {
|
||||
.lookup = ntfs_lookup,
|
||||
.create = ntfs_create,
|
||||
.link = ntfs_link,
|
||||
.unlink = ntfs_unlink,
|
||||
.symlink = ntfs_symlink,
|
||||
.mkdir = ntfs_mkdir,
|
||||
.rmdir = ntfs_rmdir,
|
||||
.mknod = ntfs_mknod,
|
||||
.rename = ntfs_rename,
|
||||
.permission = ntfs_permission,
|
||||
.get_acl = ntfs_get_acl,
|
||||
.set_acl = ntfs_set_acl,
|
||||
.setattr = ntfs3_setattr,
|
||||
.getattr = ntfs_getattr,
|
||||
.listxattr = ntfs_listxattr,
|
||||
.fiemap = ntfs_fiemap,
|
||||
};
|
||||
|
||||
const struct inode_operations ntfs_special_inode_operations = {
|
||||
.setattr = ntfs3_setattr,
|
||||
.getattr = ntfs_getattr,
|
||||
.listxattr = ntfs_listxattr,
|
||||
.get_acl = ntfs_get_acl,
|
||||
.set_acl = ntfs_set_acl,
|
||||
};
|
||||
// clang-format on
|
||||
|
|
@ -0,0 +1,609 @@
|
|||
// 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/nls.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "ntfs.h"
|
||||
#include "ntfs_fs.h"
|
||||
|
||||
static inline int compare_attr(const struct ATTRIB *left, enum ATTR_TYPE type,
|
||||
const __le16 *name, u8 name_len,
|
||||
const u16 *upcase)
|
||||
{
|
||||
/* First, compare the type codes: */
|
||||
int diff = le32_to_cpu(left->type) - le32_to_cpu(type);
|
||||
|
||||
if (diff)
|
||||
return diff;
|
||||
|
||||
/*
|
||||
* They have the same type code, so we have to compare the names.
|
||||
*/
|
||||
return ntfs_cmp_names(attr_name(left), left->name_len, name, name_len,
|
||||
upcase, true);
|
||||
}
|
||||
|
||||
/*
|
||||
* mi_new_attt_id
|
||||
*
|
||||
* returns unused attribute id that is less than mrec->next_attr_id
|
||||
*/
|
||||
static __le16 mi_new_attt_id(struct mft_inode *mi)
|
||||
{
|
||||
u16 free_id, max_id, t16;
|
||||
struct MFT_REC *rec = mi->mrec;
|
||||
struct ATTRIB *attr;
|
||||
__le16 id;
|
||||
|
||||
id = rec->next_attr_id;
|
||||
free_id = le16_to_cpu(id);
|
||||
if (free_id < 0x7FFF) {
|
||||
rec->next_attr_id = cpu_to_le16(free_id + 1);
|
||||
return id;
|
||||
}
|
||||
|
||||
/* One record can store up to 1024/24 ~= 42 attributes */
|
||||
free_id = 0;
|
||||
max_id = 0;
|
||||
|
||||
attr = NULL;
|
||||
|
||||
for (;;) {
|
||||
attr = mi_enum_attr(mi, attr);
|
||||
if (!attr) {
|
||||
rec->next_attr_id = cpu_to_le16(max_id + 1);
|
||||
mi->dirty = true;
|
||||
return cpu_to_le16(free_id);
|
||||
}
|
||||
|
||||
t16 = le16_to_cpu(attr->id);
|
||||
if (t16 == free_id) {
|
||||
free_id += 1;
|
||||
attr = NULL;
|
||||
} else if (max_id < t16)
|
||||
max_id = t16;
|
||||
}
|
||||
}
|
||||
|
||||
int mi_get(struct ntfs_sb_info *sbi, CLST rno, struct mft_inode **mi)
|
||||
{
|
||||
int err;
|
||||
struct mft_inode *m = ntfs_zalloc(sizeof(struct mft_inode));
|
||||
|
||||
if (!m)
|
||||
return -ENOMEM;
|
||||
|
||||
err = mi_init(m, sbi, rno);
|
||||
if (err) {
|
||||
ntfs_free(m);
|
||||
return err;
|
||||
}
|
||||
|
||||
err = mi_read(m, false);
|
||||
if (err) {
|
||||
mi_put(m);
|
||||
return err;
|
||||
}
|
||||
|
||||
*mi = m;
|
||||
return 0;
|
||||
}
|
||||
|
||||
void mi_put(struct mft_inode *mi)
|
||||
{
|
||||
mi_clear(mi);
|
||||
ntfs_free(mi);
|
||||
}
|
||||
|
||||
int mi_init(struct mft_inode *mi, struct ntfs_sb_info *sbi, CLST rno)
|
||||
{
|
||||
mi->sbi = sbi;
|
||||
mi->rno = rno;
|
||||
mi->mrec = ntfs_malloc(sbi->record_size);
|
||||
if (!mi->mrec)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* mi_read
|
||||
*
|
||||
* reads MFT data
|
||||
*/
|
||||
int mi_read(struct mft_inode *mi, bool is_mft)
|
||||
{
|
||||
int err;
|
||||
struct MFT_REC *rec = mi->mrec;
|
||||
struct ntfs_sb_info *sbi = mi->sbi;
|
||||
u32 bpr = sbi->record_size;
|
||||
u64 vbo = (u64)mi->rno << sbi->record_bits;
|
||||
struct ntfs_inode *mft_ni = sbi->mft.ni;
|
||||
struct runs_tree *run = mft_ni ? &mft_ni->file.run : NULL;
|
||||
struct rw_semaphore *rw_lock = NULL;
|
||||
|
||||
if (is_mounted(sbi)) {
|
||||
if (!is_mft) {
|
||||
rw_lock = &mft_ni->file.run_lock;
|
||||
down_read(rw_lock);
|
||||
}
|
||||
}
|
||||
|
||||
err = ntfs_read_bh(sbi, run, vbo, &rec->rhdr, bpr, &mi->nb);
|
||||
if (rw_lock)
|
||||
up_read(rw_lock);
|
||||
if (!err)
|
||||
goto ok;
|
||||
|
||||
if (err == -E_NTFS_FIXUP) {
|
||||
mi->dirty = true;
|
||||
goto ok;
|
||||
}
|
||||
|
||||
if (err != -ENOENT)
|
||||
goto out;
|
||||
|
||||
if (rw_lock) {
|
||||
ni_lock(mft_ni);
|
||||
down_write(rw_lock);
|
||||
}
|
||||
err = attr_load_runs_vcn(mft_ni, ATTR_DATA, NULL, 0, &mft_ni->file.run,
|
||||
vbo >> sbi->cluster_bits);
|
||||
if (rw_lock) {
|
||||
up_write(rw_lock);
|
||||
ni_unlock(mft_ni);
|
||||
}
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
if (rw_lock)
|
||||
down_read(rw_lock);
|
||||
err = ntfs_read_bh(sbi, run, vbo, &rec->rhdr, bpr, &mi->nb);
|
||||
if (rw_lock)
|
||||
up_read(rw_lock);
|
||||
|
||||
if (err == -E_NTFS_FIXUP) {
|
||||
mi->dirty = true;
|
||||
goto ok;
|
||||
}
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
ok:
|
||||
/* check field 'total' only here */
|
||||
if (le32_to_cpu(rec->total) != bpr) {
|
||||
err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
|
||||
{
|
||||
const struct MFT_REC *rec = mi->mrec;
|
||||
u32 used = le32_to_cpu(rec->used);
|
||||
u32 t32, off, asize;
|
||||
u16 t16;
|
||||
|
||||
if (!attr) {
|
||||
u32 total = le32_to_cpu(rec->total);
|
||||
|
||||
off = le16_to_cpu(rec->attr_off);
|
||||
|
||||
if (used > total)
|
||||
return NULL;
|
||||
|
||||
if (off >= used || off < MFTRECORD_FIXUP_OFFSET_1 ||
|
||||
!IsDwordAligned(off)) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Skip non-resident records */
|
||||
if (!is_rec_inuse(rec))
|
||||
return NULL;
|
||||
|
||||
attr = Add2Ptr(rec, off);
|
||||
} else {
|
||||
/* Check if input attr inside record */
|
||||
off = PtrOffset(rec, attr);
|
||||
if (off >= used)
|
||||
return NULL;
|
||||
|
||||
asize = le32_to_cpu(attr->size);
|
||||
if (asize < SIZEOF_RESIDENT) {
|
||||
/* Impossible 'cause we should not return such attribute */
|
||||
return NULL;
|
||||
}
|
||||
|
||||
attr = Add2Ptr(attr, asize);
|
||||
off += asize;
|
||||
}
|
||||
|
||||
asize = le32_to_cpu(attr->size);
|
||||
|
||||
/* Can we use the first field (attr->type) */
|
||||
if (off + 8 > used) {
|
||||
static_assert(QuadAlign(sizeof(enum ATTR_TYPE)) == 8);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (attr->type == ATTR_END) {
|
||||
/* end of enumeration */
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* 0x100 is last known attribute for now*/
|
||||
t32 = le32_to_cpu(attr->type);
|
||||
if ((t32 & 0xf) || (t32 > 0x100))
|
||||
return NULL;
|
||||
|
||||
/* Check boundary */
|
||||
if (off + asize > used)
|
||||
return NULL;
|
||||
|
||||
/* Check size of attribute */
|
||||
if (!attr->non_res) {
|
||||
if (asize < SIZEOF_RESIDENT)
|
||||
return NULL;
|
||||
|
||||
t16 = le16_to_cpu(attr->res.data_off);
|
||||
|
||||
if (t16 > asize)
|
||||
return NULL;
|
||||
|
||||
t32 = le32_to_cpu(attr->res.data_size);
|
||||
if (t16 + t32 > asize)
|
||||
return NULL;
|
||||
|
||||
return attr;
|
||||
}
|
||||
|
||||
/* Check some nonresident fields */
|
||||
if (attr->name_len &&
|
||||
le16_to_cpu(attr->name_off) + sizeof(short) * attr->name_len >
|
||||
le16_to_cpu(attr->nres.run_off)) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (attr->nres.svcn || !is_attr_ext(attr)) {
|
||||
if (asize + 8 < SIZEOF_NONRESIDENT)
|
||||
return NULL;
|
||||
|
||||
if (attr->nres.c_unit)
|
||||
return NULL;
|
||||
} else if (asize + 8 < SIZEOF_NONRESIDENT_EX)
|
||||
return NULL;
|
||||
|
||||
return attr;
|
||||
}
|
||||
|
||||
/*
|
||||
* mi_find_attr
|
||||
*
|
||||
* finds the attribute by type and name and id
|
||||
*/
|
||||
struct ATTRIB *mi_find_attr(struct mft_inode *mi, struct ATTRIB *attr,
|
||||
enum ATTR_TYPE type, const __le16 *name,
|
||||
size_t name_len, const __le16 *id)
|
||||
{
|
||||
u32 type_in = le32_to_cpu(type);
|
||||
u32 atype;
|
||||
|
||||
next_attr:
|
||||
attr = mi_enum_attr(mi, attr);
|
||||
if (!attr)
|
||||
return NULL;
|
||||
|
||||
atype = le32_to_cpu(attr->type);
|
||||
if (atype > type_in)
|
||||
return NULL;
|
||||
|
||||
if (atype < type_in)
|
||||
goto next_attr;
|
||||
|
||||
if (attr->name_len != name_len)
|
||||
goto next_attr;
|
||||
|
||||
if (name_len && memcmp(attr_name(attr), name, name_len * sizeof(short)))
|
||||
goto next_attr;
|
||||
|
||||
if (id && *id != attr->id)
|
||||
goto next_attr;
|
||||
|
||||
return attr;
|
||||
}
|
||||
|
||||
int mi_write(struct mft_inode *mi, int wait)
|
||||
{
|
||||
struct MFT_REC *rec;
|
||||
int err;
|
||||
struct ntfs_sb_info *sbi;
|
||||
|
||||
if (!mi->dirty)
|
||||
return 0;
|
||||
|
||||
sbi = mi->sbi;
|
||||
rec = mi->mrec;
|
||||
|
||||
err = ntfs_write_bh(sbi, &rec->rhdr, &mi->nb, wait);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (mi->rno < sbi->mft.recs_mirr)
|
||||
sbi->flags |= NTFS_FLAGS_MFTMIRR;
|
||||
|
||||
mi->dirty = false;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mi_format_new(struct mft_inode *mi, struct ntfs_sb_info *sbi, CLST rno,
|
||||
__le16 flags, bool is_mft)
|
||||
{
|
||||
int err;
|
||||
u16 seq = 1;
|
||||
struct MFT_REC *rec;
|
||||
u64 vbo = (u64)rno << sbi->record_bits;
|
||||
|
||||
err = mi_init(mi, sbi, rno);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
rec = mi->mrec;
|
||||
|
||||
if (rno == MFT_REC_MFT) {
|
||||
;
|
||||
} else if (rno < MFT_REC_FREE) {
|
||||
seq = rno;
|
||||
} else if (rno >= sbi->mft.used) {
|
||||
;
|
||||
} else if (mi_read(mi, is_mft)) {
|
||||
;
|
||||
} else if (rec->rhdr.sign == NTFS_FILE_SIGNATURE) {
|
||||
/* Record is reused. Update its sequence number */
|
||||
seq = le16_to_cpu(rec->seq) + 1;
|
||||
if (!seq)
|
||||
seq = 1;
|
||||
}
|
||||
|
||||
memcpy(rec, sbi->new_rec, sbi->record_size);
|
||||
|
||||
rec->seq = cpu_to_le16(seq);
|
||||
rec->flags = RECORD_FLAG_IN_USE | flags;
|
||||
|
||||
mi->dirty = true;
|
||||
|
||||
if (!mi->nb.nbufs) {
|
||||
struct ntfs_inode *ni = sbi->mft.ni;
|
||||
bool lock = false;
|
||||
|
||||
if (is_mounted(sbi) && !is_mft) {
|
||||
down_read(&ni->file.run_lock);
|
||||
lock = true;
|
||||
}
|
||||
|
||||
err = ntfs_get_bh(sbi, &ni->file.run, vbo, sbi->record_size,
|
||||
&mi->nb);
|
||||
if (lock)
|
||||
up_read(&ni->file.run_lock);
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* mi_mark_free
|
||||
*
|
||||
* marks record as unused and marks it as free in bitmap
|
||||
*/
|
||||
void mi_mark_free(struct mft_inode *mi)
|
||||
{
|
||||
CLST rno = mi->rno;
|
||||
struct ntfs_sb_info *sbi = mi->sbi;
|
||||
|
||||
if (rno >= MFT_REC_RESERVED && rno < MFT_REC_FREE) {
|
||||
ntfs_clear_mft_tail(sbi, rno, rno + 1);
|
||||
mi->dirty = false;
|
||||
return;
|
||||
}
|
||||
|
||||
if (mi->mrec) {
|
||||
clear_rec_inuse(mi->mrec);
|
||||
mi->dirty = true;
|
||||
mi_write(mi, 0);
|
||||
}
|
||||
ntfs_mark_rec_free(sbi, rno);
|
||||
}
|
||||
|
||||
/*
|
||||
* mi_insert_attr
|
||||
*
|
||||
* reserves space for new attribute
|
||||
* returns not full constructed attribute or NULL if not possible to create
|
||||
*/
|
||||
struct ATTRIB *mi_insert_attr(struct mft_inode *mi, enum ATTR_TYPE type,
|
||||
const __le16 *name, u8 name_len, u32 asize,
|
||||
u16 name_off)
|
||||
{
|
||||
size_t tail;
|
||||
struct ATTRIB *attr;
|
||||
__le16 id;
|
||||
struct MFT_REC *rec = mi->mrec;
|
||||
struct ntfs_sb_info *sbi = mi->sbi;
|
||||
u32 used = le32_to_cpu(rec->used);
|
||||
const u16 *upcase = sbi->upcase;
|
||||
int diff;
|
||||
|
||||
/* Can we insert mi attribute? */
|
||||
if (used + asize > mi->sbi->record_size)
|
||||
return NULL;
|
||||
|
||||
/*
|
||||
* Scan through the list of attributes to find the point
|
||||
* at which we should insert it.
|
||||
*/
|
||||
attr = NULL;
|
||||
while ((attr = mi_enum_attr(mi, attr))) {
|
||||
diff = compare_attr(attr, type, name, name_len, upcase);
|
||||
if (diff > 0)
|
||||
break;
|
||||
if (diff < 0)
|
||||
continue;
|
||||
|
||||
if (!is_attr_indexed(attr))
|
||||
return NULL;
|
||||
break;
|
||||
}
|
||||
|
||||
if (!attr) {
|
||||
tail = 8; /* not used, just to suppress warning */
|
||||
attr = Add2Ptr(rec, used - 8);
|
||||
} else {
|
||||
tail = used - PtrOffset(rec, attr);
|
||||
}
|
||||
|
||||
id = mi_new_attt_id(mi);
|
||||
|
||||
memmove(Add2Ptr(attr, asize), attr, tail);
|
||||
memset(attr, 0, asize);
|
||||
|
||||
attr->type = type;
|
||||
attr->size = cpu_to_le32(asize);
|
||||
attr->name_len = name_len;
|
||||
attr->name_off = cpu_to_le16(name_off);
|
||||
attr->id = id;
|
||||
|
||||
memmove(Add2Ptr(attr, name_off), name, name_len * sizeof(short));
|
||||
rec->used = cpu_to_le32(used + asize);
|
||||
|
||||
mi->dirty = true;
|
||||
|
||||
return attr;
|
||||
}
|
||||
|
||||
/*
|
||||
* mi_remove_attr
|
||||
*
|
||||
* removes the attribute from record
|
||||
* NOTE: The source attr will point to next attribute
|
||||
*/
|
||||
bool mi_remove_attr(struct mft_inode *mi, struct ATTRIB *attr)
|
||||
{
|
||||
struct MFT_REC *rec = mi->mrec;
|
||||
u32 aoff = PtrOffset(rec, attr);
|
||||
u32 used = le32_to_cpu(rec->used);
|
||||
u32 asize = le32_to_cpu(attr->size);
|
||||
|
||||
if (aoff + asize > used)
|
||||
return false;
|
||||
|
||||
used -= asize;
|
||||
memmove(attr, Add2Ptr(attr, asize), used - aoff);
|
||||
rec->used = cpu_to_le32(used);
|
||||
mi->dirty = true;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/* bytes = "new attribute size" - "old attribute size" */
|
||||
bool mi_resize_attr(struct mft_inode *mi, struct ATTRIB *attr, int bytes)
|
||||
{
|
||||
struct MFT_REC *rec = mi->mrec;
|
||||
u32 aoff = PtrOffset(rec, attr);
|
||||
u32 total, used = le32_to_cpu(rec->used);
|
||||
u32 nsize, asize = le32_to_cpu(attr->size);
|
||||
u32 rsize = le32_to_cpu(attr->res.data_size);
|
||||
int tail = (int)(used - aoff - asize);
|
||||
int dsize;
|
||||
char *next;
|
||||
|
||||
if (tail < 0 || aoff >= used)
|
||||
return false;
|
||||
|
||||
if (!bytes)
|
||||
return true;
|
||||
|
||||
total = le32_to_cpu(rec->total);
|
||||
next = Add2Ptr(attr, asize);
|
||||
|
||||
if (bytes > 0) {
|
||||
dsize = QuadAlign(bytes);
|
||||
if (used + dsize > total)
|
||||
return false;
|
||||
nsize = asize + dsize;
|
||||
// move tail
|
||||
memmove(next + dsize, next, tail);
|
||||
memset(next, 0, dsize);
|
||||
used += dsize;
|
||||
rsize += dsize;
|
||||
} else {
|
||||
dsize = QuadAlign(-bytes);
|
||||
if (dsize > asize)
|
||||
return false;
|
||||
nsize = asize - dsize;
|
||||
memmove(next - dsize, next, tail);
|
||||
used -= dsize;
|
||||
rsize -= dsize;
|
||||
}
|
||||
|
||||
rec->used = cpu_to_le32(used);
|
||||
attr->size = cpu_to_le32(nsize);
|
||||
if (!attr->non_res)
|
||||
attr->res.data_size = cpu_to_le32(rsize);
|
||||
mi->dirty = true;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
int mi_pack_runs(struct mft_inode *mi, struct ATTRIB *attr,
|
||||
struct runs_tree *run, CLST len)
|
||||
{
|
||||
int err = 0;
|
||||
struct ntfs_sb_info *sbi = mi->sbi;
|
||||
u32 new_run_size;
|
||||
CLST plen;
|
||||
struct MFT_REC *rec = mi->mrec;
|
||||
CLST svcn = le64_to_cpu(attr->nres.svcn);
|
||||
u32 used = le32_to_cpu(rec->used);
|
||||
u32 aoff = PtrOffset(rec, attr);
|
||||
u32 asize = le32_to_cpu(attr->size);
|
||||
char *next = Add2Ptr(attr, asize);
|
||||
u16 run_off = le16_to_cpu(attr->nres.run_off);
|
||||
u32 run_size = asize - run_off;
|
||||
u32 tail = used - aoff - asize;
|
||||
u32 dsize = sbi->record_size - used;
|
||||
|
||||
/* Make a maximum gap in current record */
|
||||
memmove(next + dsize, next, tail);
|
||||
|
||||
/* Pack as much as possible */
|
||||
err = run_pack(run, svcn, len, Add2Ptr(attr, run_off), run_size + dsize,
|
||||
&plen);
|
||||
if (err < 0) {
|
||||
memmove(next, next + dsize, tail);
|
||||
return err;
|
||||
}
|
||||
|
||||
new_run_size = QuadAlign(err);
|
||||
|
||||
memmove(next + new_run_size - run_size, next + dsize, tail);
|
||||
|
||||
attr->size = cpu_to_le32(asize + new_run_size - run_size);
|
||||
attr->nres.evcn = cpu_to_le64(svcn + plen - 1);
|
||||
rec->used = cpu_to_le32(used + new_run_size - run_size);
|
||||
mi->dirty = true;
|
||||
|
||||
return 0;
|
||||
}
|
||||
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