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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Konstantin Komarov](/assets/img/avatar_default.png)
Added minor refactoring. Added and fixed some comments. In some places, the code has been reformatted to fit into 80 columns. clang-format-12 was used to format code according kernel's .clang-format. Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
2691 lines
56 KiB
C
2691 lines
56 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 "debug.h"
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#include "ntfs.h"
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#include "ntfs_fs.h"
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static const struct INDEX_NAMES {
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const __le16 *name;
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u8 name_len;
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} s_index_names[INDEX_MUTEX_TOTAL] = {
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{ I30_NAME, ARRAY_SIZE(I30_NAME) }, { SII_NAME, ARRAY_SIZE(SII_NAME) },
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{ SDH_NAME, ARRAY_SIZE(SDH_NAME) }, { SO_NAME, ARRAY_SIZE(SO_NAME) },
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{ SQ_NAME, ARRAY_SIZE(SQ_NAME) }, { SR_NAME, ARRAY_SIZE(SR_NAME) },
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};
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/*
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* cmp_fnames - Compare two names in index.
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*
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* if l1 != 0
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* Both names are little endian on-disk ATTR_FILE_NAME structs.
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* else
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* key1 - cpu_str, key2 - ATTR_FILE_NAME
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*/
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static int cmp_fnames(const void *key1, size_t l1, const void *key2, size_t l2,
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const void *data)
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{
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const struct ATTR_FILE_NAME *f2 = key2;
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const struct ntfs_sb_info *sbi = data;
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const struct ATTR_FILE_NAME *f1;
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u16 fsize2;
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bool both_case;
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if (l2 <= offsetof(struct ATTR_FILE_NAME, name))
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return -1;
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fsize2 = fname_full_size(f2);
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if (l2 < fsize2)
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return -1;
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both_case = f2->type != FILE_NAME_DOS && !sbi->options->nocase;
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if (!l1) {
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const struct le_str *s2 = (struct le_str *)&f2->name_len;
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/*
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* If names are equal (case insensitive)
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* try to compare it case sensitive.
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*/
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return ntfs_cmp_names_cpu(key1, s2, sbi->upcase, both_case);
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}
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f1 = key1;
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return ntfs_cmp_names(f1->name, f1->name_len, f2->name, f2->name_len,
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sbi->upcase, both_case);
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}
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/*
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* cmp_uint - $SII of $Secure and $Q of Quota
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*/
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static int cmp_uint(const void *key1, size_t l1, const void *key2, size_t l2,
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const void *data)
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{
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const u32 *k1 = key1;
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const u32 *k2 = key2;
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if (l2 < sizeof(u32))
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return -1;
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if (*k1 < *k2)
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return -1;
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if (*k1 > *k2)
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return 1;
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return 0;
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}
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/*
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* cmp_sdh - $SDH of $Secure
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*/
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static int cmp_sdh(const void *key1, size_t l1, const void *key2, size_t l2,
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const void *data)
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{
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const struct SECURITY_KEY *k1 = key1;
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const struct SECURITY_KEY *k2 = key2;
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u32 t1, t2;
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if (l2 < sizeof(struct SECURITY_KEY))
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return -1;
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t1 = le32_to_cpu(k1->hash);
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t2 = le32_to_cpu(k2->hash);
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/* First value is a hash value itself. */
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if (t1 < t2)
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return -1;
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if (t1 > t2)
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return 1;
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/* Second value is security Id. */
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if (data) {
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t1 = le32_to_cpu(k1->sec_id);
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t2 = le32_to_cpu(k2->sec_id);
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if (t1 < t2)
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return -1;
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if (t1 > t2)
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return 1;
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}
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return 0;
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}
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/*
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* cmp_uints - $O of ObjId and "$R" for Reparse.
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*/
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static int cmp_uints(const void *key1, size_t l1, const void *key2, size_t l2,
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const void *data)
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{
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const __le32 *k1 = key1;
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const __le32 *k2 = key2;
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size_t count;
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if ((size_t)data == 1) {
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/*
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* ni_delete_all -> ntfs_remove_reparse ->
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* delete all with this reference.
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* k1, k2 - pointers to REPARSE_KEY
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*/
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k1 += 1; // Skip REPARSE_KEY.ReparseTag
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k2 += 1; // Skip REPARSE_KEY.ReparseTag
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if (l2 <= sizeof(int))
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return -1;
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l2 -= sizeof(int);
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if (l1 <= sizeof(int))
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return 1;
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l1 -= sizeof(int);
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}
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if (l2 < sizeof(int))
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return -1;
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for (count = min(l1, l2) >> 2; count > 0; --count, ++k1, ++k2) {
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u32 t1 = le32_to_cpu(*k1);
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u32 t2 = le32_to_cpu(*k2);
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if (t1 > t2)
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return 1;
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if (t1 < t2)
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return -1;
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}
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if (l1 > l2)
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return 1;
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if (l1 < l2)
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return -1;
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return 0;
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}
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static inline NTFS_CMP_FUNC get_cmp_func(const struct INDEX_ROOT *root)
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{
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switch (root->type) {
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case ATTR_NAME:
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if (root->rule == NTFS_COLLATION_TYPE_FILENAME)
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return &cmp_fnames;
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break;
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case ATTR_ZERO:
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switch (root->rule) {
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case NTFS_COLLATION_TYPE_UINT:
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return &cmp_uint;
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case NTFS_COLLATION_TYPE_SECURITY_HASH:
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return &cmp_sdh;
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case NTFS_COLLATION_TYPE_UINTS:
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return &cmp_uints;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return NULL;
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}
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struct bmp_buf {
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struct ATTRIB *b;
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struct mft_inode *mi;
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struct buffer_head *bh;
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ulong *buf;
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size_t bit;
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u32 nbits;
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u64 new_valid;
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};
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static int bmp_buf_get(struct ntfs_index *indx, struct ntfs_inode *ni,
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size_t bit, struct bmp_buf *bbuf)
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{
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struct ATTRIB *b;
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size_t data_size, valid_size, vbo, off = bit >> 3;
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struct ntfs_sb_info *sbi = ni->mi.sbi;
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CLST vcn = off >> sbi->cluster_bits;
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struct ATTR_LIST_ENTRY *le = NULL;
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struct buffer_head *bh;
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struct super_block *sb;
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u32 blocksize;
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const struct INDEX_NAMES *in = &s_index_names[indx->type];
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bbuf->bh = NULL;
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b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
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&vcn, &bbuf->mi);
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bbuf->b = b;
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if (!b)
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return -EINVAL;
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if (!b->non_res) {
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data_size = le32_to_cpu(b->res.data_size);
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if (off >= data_size)
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return -EINVAL;
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bbuf->buf = (ulong *)resident_data(b);
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bbuf->bit = 0;
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bbuf->nbits = data_size * 8;
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return 0;
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}
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data_size = le64_to_cpu(b->nres.data_size);
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if (WARN_ON(off >= data_size)) {
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/* Looks like filesystem error. */
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return -EINVAL;
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}
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valid_size = le64_to_cpu(b->nres.valid_size);
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bh = ntfs_bread_run(sbi, &indx->bitmap_run, off);
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if (!bh)
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return -EIO;
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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bbuf->bh = bh;
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if (buffer_locked(bh))
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__wait_on_buffer(bh);
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lock_buffer(bh);
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sb = sbi->sb;
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blocksize = sb->s_blocksize;
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vbo = off & ~(size_t)sbi->block_mask;
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bbuf->new_valid = vbo + blocksize;
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if (bbuf->new_valid <= valid_size)
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bbuf->new_valid = 0;
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else if (bbuf->new_valid > data_size)
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bbuf->new_valid = data_size;
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if (vbo >= valid_size) {
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memset(bh->b_data, 0, blocksize);
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} else if (vbo + blocksize > valid_size) {
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u32 voff = valid_size & sbi->block_mask;
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memset(bh->b_data + voff, 0, blocksize - voff);
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}
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bbuf->buf = (ulong *)bh->b_data;
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bbuf->bit = 8 * (off & ~(size_t)sbi->block_mask);
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bbuf->nbits = 8 * blocksize;
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return 0;
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}
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static void bmp_buf_put(struct bmp_buf *bbuf, bool dirty)
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{
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struct buffer_head *bh = bbuf->bh;
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struct ATTRIB *b = bbuf->b;
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if (!bh) {
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if (b && !b->non_res && dirty)
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bbuf->mi->dirty = true;
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return;
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}
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if (!dirty)
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goto out;
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if (bbuf->new_valid) {
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b->nres.valid_size = cpu_to_le64(bbuf->new_valid);
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bbuf->mi->dirty = true;
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}
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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out:
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unlock_buffer(bh);
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put_bh(bh);
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}
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/*
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* indx_mark_used - Mark the bit @bit as used.
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*/
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static int indx_mark_used(struct ntfs_index *indx, struct ntfs_inode *ni,
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size_t bit)
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{
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int err;
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struct bmp_buf bbuf;
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err = bmp_buf_get(indx, ni, bit, &bbuf);
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if (err)
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return err;
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__set_bit_le(bit - bbuf.bit, bbuf.buf);
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bmp_buf_put(&bbuf, true);
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return 0;
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}
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/*
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* indx_mark_free - Mark the bit @bit as free.
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*/
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static int indx_mark_free(struct ntfs_index *indx, struct ntfs_inode *ni,
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size_t bit)
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{
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int err;
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struct bmp_buf bbuf;
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err = bmp_buf_get(indx, ni, bit, &bbuf);
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if (err)
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return err;
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__clear_bit_le(bit - bbuf.bit, bbuf.buf);
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bmp_buf_put(&bbuf, true);
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return 0;
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}
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/*
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* scan_nres_bitmap
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*
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* If ntfs_readdir calls this function (indx_used_bit -> scan_nres_bitmap),
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* inode is shared locked and no ni_lock.
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* Use rw_semaphore for read/write access to bitmap_run.
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*/
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static int scan_nres_bitmap(struct ntfs_inode *ni, struct ATTRIB *bitmap,
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struct ntfs_index *indx, size_t from,
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bool (*fn)(const ulong *buf, u32 bit, u32 bits,
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size_t *ret),
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size_t *ret)
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{
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struct ntfs_sb_info *sbi = ni->mi.sbi;
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struct super_block *sb = sbi->sb;
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struct runs_tree *run = &indx->bitmap_run;
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struct rw_semaphore *lock = &indx->run_lock;
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u32 nbits = sb->s_blocksize * 8;
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u32 blocksize = sb->s_blocksize;
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u64 valid_size = le64_to_cpu(bitmap->nres.valid_size);
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u64 data_size = le64_to_cpu(bitmap->nres.data_size);
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sector_t eblock = bytes_to_block(sb, data_size);
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size_t vbo = from >> 3;
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sector_t blk = (vbo & sbi->cluster_mask) >> sb->s_blocksize_bits;
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sector_t vblock = vbo >> sb->s_blocksize_bits;
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sector_t blen, block;
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CLST lcn, clen, vcn, vcn_next;
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size_t idx;
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struct buffer_head *bh;
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bool ok;
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*ret = MINUS_ONE_T;
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if (vblock >= eblock)
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return 0;
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from &= nbits - 1;
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vcn = vbo >> sbi->cluster_bits;
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down_read(lock);
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ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx);
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up_read(lock);
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next_run:
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if (!ok) {
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int err;
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const struct INDEX_NAMES *name = &s_index_names[indx->type];
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down_write(lock);
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err = attr_load_runs_vcn(ni, ATTR_BITMAP, name->name,
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name->name_len, run, vcn);
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up_write(lock);
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if (err)
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return err;
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down_read(lock);
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ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx);
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up_read(lock);
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if (!ok)
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return -EINVAL;
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}
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blen = (sector_t)clen * sbi->blocks_per_cluster;
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block = (sector_t)lcn * sbi->blocks_per_cluster;
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for (; blk < blen; blk++, from = 0) {
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bh = ntfs_bread(sb, block + blk);
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if (!bh)
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return -EIO;
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vbo = (u64)vblock << sb->s_blocksize_bits;
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if (vbo >= valid_size) {
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memset(bh->b_data, 0, blocksize);
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} else if (vbo + blocksize > valid_size) {
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u32 voff = valid_size & sbi->block_mask;
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memset(bh->b_data + voff, 0, blocksize - voff);
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}
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if (vbo + blocksize > data_size)
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nbits = 8 * (data_size - vbo);
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ok = nbits > from ?
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(*fn)((ulong *)bh->b_data, from, nbits, ret) :
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false;
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put_bh(bh);
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if (ok) {
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*ret += 8 * vbo;
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return 0;
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}
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if (++vblock >= eblock) {
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*ret = MINUS_ONE_T;
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return 0;
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}
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}
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blk = 0;
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vcn_next = vcn + clen;
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down_read(lock);
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ok = run_get_entry(run, ++idx, &vcn, &lcn, &clen) && vcn == vcn_next;
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if (!ok)
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vcn = vcn_next;
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up_read(lock);
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goto next_run;
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}
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static bool scan_for_free(const ulong *buf, u32 bit, u32 bits, size_t *ret)
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{
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size_t pos = find_next_zero_bit_le(buf, bits, bit);
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if (pos >= bits)
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return false;
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*ret = pos;
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return true;
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}
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|
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/*
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* indx_find_free - Look for free bit.
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*
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* Return: -1 if no free bits.
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*/
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static int indx_find_free(struct ntfs_index *indx, struct ntfs_inode *ni,
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size_t *bit, struct ATTRIB **bitmap)
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{
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struct ATTRIB *b;
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struct ATTR_LIST_ENTRY *le = NULL;
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const struct INDEX_NAMES *in = &s_index_names[indx->type];
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int err;
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b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
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NULL, NULL);
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if (!b)
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return -ENOENT;
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*bitmap = b;
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*bit = MINUS_ONE_T;
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if (!b->non_res) {
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u32 nbits = 8 * le32_to_cpu(b->res.data_size);
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size_t pos = find_next_zero_bit_le(resident_data(b), nbits, 0);
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if (pos < nbits)
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*bit = pos;
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} else {
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err = scan_nres_bitmap(ni, b, indx, 0, &scan_for_free, bit);
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if (err)
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return err;
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}
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return 0;
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}
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|
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static bool scan_for_used(const ulong *buf, u32 bit, u32 bits, size_t *ret)
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{
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size_t pos = find_next_bit_le(buf, bits, bit);
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if (pos >= bits)
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return false;
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*ret = pos;
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return true;
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}
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|
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/*
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* indx_used_bit - Look for used bit.
|
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*
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* Return: MINUS_ONE_T if no used bits.
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*/
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int indx_used_bit(struct ntfs_index *indx, struct ntfs_inode *ni, size_t *bit)
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{
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struct ATTRIB *b;
|
|
struct ATTR_LIST_ENTRY *le = NULL;
|
|
size_t from = *bit;
|
|
const struct INDEX_NAMES *in = &s_index_names[indx->type];
|
|
int err;
|
|
|
|
b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
|
|
NULL, NULL);
|
|
|
|
if (!b)
|
|
return -ENOENT;
|
|
|
|
*bit = MINUS_ONE_T;
|
|
|
|
if (!b->non_res) {
|
|
u32 nbits = le32_to_cpu(b->res.data_size) * 8;
|
|
size_t pos = find_next_bit_le(resident_data(b), nbits, from);
|
|
|
|
if (pos < nbits)
|
|
*bit = pos;
|
|
} else {
|
|
err = scan_nres_bitmap(ni, b, indx, from, &scan_for_used, bit);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* hdr_find_split
|
|
*
|
|
* Find a point at which the index allocation buffer would like to be split.
|
|
* NOTE: This function should never return 'END' entry NULL returns on error.
|
|
*/
|
|
static const struct NTFS_DE *hdr_find_split(const struct INDEX_HDR *hdr)
|
|
{
|
|
size_t o;
|
|
const struct NTFS_DE *e = hdr_first_de(hdr);
|
|
u32 used_2 = le32_to_cpu(hdr->used) >> 1;
|
|
u16 esize;
|
|
|
|
if (!e || de_is_last(e))
|
|
return NULL;
|
|
|
|
esize = le16_to_cpu(e->size);
|
|
for (o = le32_to_cpu(hdr->de_off) + esize; o < used_2; o += esize) {
|
|
const struct NTFS_DE *p = e;
|
|
|
|
e = Add2Ptr(hdr, o);
|
|
|
|
/* We must not return END entry. */
|
|
if (de_is_last(e))
|
|
return p;
|
|
|
|
esize = le16_to_cpu(e->size);
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
/*
|
|
* hdr_insert_head - Insert some entries at the beginning of the buffer.
|
|
*
|
|
* It is used to insert entries into a newly-created buffer.
|
|
*/
|
|
static const struct NTFS_DE *hdr_insert_head(struct INDEX_HDR *hdr,
|
|
const void *ins, u32 ins_bytes)
|
|
{
|
|
u32 to_move;
|
|
struct NTFS_DE *e = hdr_first_de(hdr);
|
|
u32 used = le32_to_cpu(hdr->used);
|
|
|
|
if (!e)
|
|
return NULL;
|
|
|
|
/* Now we just make room for the inserted entries and jam it in. */
|
|
to_move = used - le32_to_cpu(hdr->de_off);
|
|
memmove(Add2Ptr(e, ins_bytes), e, to_move);
|
|
memcpy(e, ins, ins_bytes);
|
|
hdr->used = cpu_to_le32(used + ins_bytes);
|
|
|
|
return e;
|
|
}
|
|
|
|
/*
|
|
* index_hdr_check
|
|
*
|
|
* return true if INDEX_HDR is valid
|
|
*/
|
|
static bool index_hdr_check(const struct INDEX_HDR *hdr, u32 bytes)
|
|
{
|
|
u32 end = le32_to_cpu(hdr->used);
|
|
u32 tot = le32_to_cpu(hdr->total);
|
|
u32 off = le32_to_cpu(hdr->de_off);
|
|
|
|
if (!IS_ALIGNED(off, 8) || tot > bytes || end > tot ||
|
|
off + sizeof(struct NTFS_DE) > end) {
|
|
/* incorrect index buffer. */
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* index_buf_check
|
|
*
|
|
* return true if INDEX_BUFFER seems is valid
|
|
*/
|
|
static bool index_buf_check(const struct INDEX_BUFFER *ib, u32 bytes,
|
|
const CLST *vbn)
|
|
{
|
|
const struct NTFS_RECORD_HEADER *rhdr = &ib->rhdr;
|
|
u16 fo = le16_to_cpu(rhdr->fix_off);
|
|
u16 fn = le16_to_cpu(rhdr->fix_num);
|
|
|
|
if (bytes <= offsetof(struct INDEX_BUFFER, ihdr) ||
|
|
rhdr->sign != NTFS_INDX_SIGNATURE ||
|
|
fo < sizeof(struct INDEX_BUFFER)
|
|
/* Check index buffer vbn. */
|
|
|| (vbn && *vbn != le64_to_cpu(ib->vbn)) || (fo % sizeof(short)) ||
|
|
fo + fn * sizeof(short) >= bytes ||
|
|
fn != ((bytes >> SECTOR_SHIFT) + 1)) {
|
|
/* incorrect index buffer. */
|
|
return false;
|
|
}
|
|
|
|
return index_hdr_check(&ib->ihdr,
|
|
bytes - offsetof(struct INDEX_BUFFER, ihdr));
|
|
}
|
|
|
|
void fnd_clear(struct ntfs_fnd *fnd)
|
|
{
|
|
int i;
|
|
|
|
for (i = fnd->level - 1; i >= 0; i--) {
|
|
struct indx_node *n = fnd->nodes[i];
|
|
|
|
if (!n)
|
|
continue;
|
|
|
|
put_indx_node(n);
|
|
fnd->nodes[i] = NULL;
|
|
}
|
|
fnd->level = 0;
|
|
fnd->root_de = NULL;
|
|
}
|
|
|
|
static int fnd_push(struct ntfs_fnd *fnd, struct indx_node *n,
|
|
struct NTFS_DE *e)
|
|
{
|
|
int i = fnd->level;
|
|
|
|
if (i < 0 || i >= ARRAY_SIZE(fnd->nodes))
|
|
return -EINVAL;
|
|
fnd->nodes[i] = n;
|
|
fnd->de[i] = e;
|
|
fnd->level += 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct indx_node *fnd_pop(struct ntfs_fnd *fnd)
|
|
{
|
|
struct indx_node *n;
|
|
int i = fnd->level;
|
|
|
|
i -= 1;
|
|
n = fnd->nodes[i];
|
|
fnd->nodes[i] = NULL;
|
|
fnd->level = i;
|
|
|
|
return n;
|
|
}
|
|
|
|
static bool fnd_is_empty(struct ntfs_fnd *fnd)
|
|
{
|
|
if (!fnd->level)
|
|
return !fnd->root_de;
|
|
|
|
return !fnd->de[fnd->level - 1];
|
|
}
|
|
|
|
/*
|
|
* hdr_find_e - Locate an entry the index buffer.
|
|
*
|
|
* If no matching entry is found, it returns the first entry which is greater
|
|
* than the desired entry If the search key is greater than all the entries the
|
|
* buffer, it returns the 'end' entry. This function does a binary search of the
|
|
* current index buffer, for the first entry that is <= to the search value.
|
|
*
|
|
* Return: NULL if error.
|
|
*/
|
|
static struct NTFS_DE *hdr_find_e(const struct ntfs_index *indx,
|
|
const struct INDEX_HDR *hdr, const void *key,
|
|
size_t key_len, const void *ctx, int *diff)
|
|
{
|
|
struct NTFS_DE *e, *found = NULL;
|
|
NTFS_CMP_FUNC cmp = indx->cmp;
|
|
int min_idx = 0, mid_idx, max_idx = 0;
|
|
int diff2;
|
|
int table_size = 8;
|
|
u32 e_size, e_key_len;
|
|
u32 end = le32_to_cpu(hdr->used);
|
|
u32 off = le32_to_cpu(hdr->de_off);
|
|
u32 total = le32_to_cpu(hdr->total);
|
|
u16 offs[128];
|
|
|
|
fill_table:
|
|
if (end > total)
|
|
return NULL;
|
|
|
|
if (off + sizeof(struct NTFS_DE) > end)
|
|
return NULL;
|
|
|
|
e = Add2Ptr(hdr, off);
|
|
e_size = le16_to_cpu(e->size);
|
|
|
|
if (e_size < sizeof(struct NTFS_DE) || off + e_size > end)
|
|
return NULL;
|
|
|
|
if (!de_is_last(e)) {
|
|
offs[max_idx] = off;
|
|
off += e_size;
|
|
|
|
max_idx++;
|
|
if (max_idx < table_size)
|
|
goto fill_table;
|
|
|
|
max_idx--;
|
|
}
|
|
|
|
binary_search:
|
|
e_key_len = le16_to_cpu(e->key_size);
|
|
|
|
diff2 = (*cmp)(key, key_len, e + 1, e_key_len, ctx);
|
|
if (diff2 > 0) {
|
|
if (found) {
|
|
min_idx = mid_idx + 1;
|
|
} else {
|
|
if (de_is_last(e))
|
|
return NULL;
|
|
|
|
max_idx = 0;
|
|
table_size = min(table_size * 2, (int)ARRAY_SIZE(offs));
|
|
goto fill_table;
|
|
}
|
|
} else if (diff2 < 0) {
|
|
if (found)
|
|
max_idx = mid_idx - 1;
|
|
else
|
|
max_idx--;
|
|
|
|
found = e;
|
|
} else {
|
|
*diff = 0;
|
|
return e;
|
|
}
|
|
|
|
if (min_idx > max_idx) {
|
|
*diff = -1;
|
|
return found;
|
|
}
|
|
|
|
mid_idx = (min_idx + max_idx) >> 1;
|
|
e = Add2Ptr(hdr, offs[mid_idx]);
|
|
|
|
goto binary_search;
|
|
}
|
|
|
|
/*
|
|
* hdr_insert_de - Insert an index entry into the buffer.
|
|
*
|
|
* 'before' should be a pointer previously returned from hdr_find_e.
|
|
*/
|
|
static struct NTFS_DE *hdr_insert_de(const struct ntfs_index *indx,
|
|
struct INDEX_HDR *hdr,
|
|
const struct NTFS_DE *de,
|
|
struct NTFS_DE *before, const void *ctx)
|
|
{
|
|
int diff;
|
|
size_t off = PtrOffset(hdr, before);
|
|
u32 used = le32_to_cpu(hdr->used);
|
|
u32 total = le32_to_cpu(hdr->total);
|
|
u16 de_size = le16_to_cpu(de->size);
|
|
|
|
/* First, check to see if there's enough room. */
|
|
if (used + de_size > total)
|
|
return NULL;
|
|
|
|
/* We know there's enough space, so we know we'll succeed. */
|
|
if (before) {
|
|
/* Check that before is inside Index. */
|
|
if (off >= used || off < le32_to_cpu(hdr->de_off) ||
|
|
off + le16_to_cpu(before->size) > total) {
|
|
return NULL;
|
|
}
|
|
goto ok;
|
|
}
|
|
/* No insert point is applied. Get it manually. */
|
|
before = hdr_find_e(indx, hdr, de + 1, le16_to_cpu(de->key_size), ctx,
|
|
&diff);
|
|
if (!before)
|
|
return NULL;
|
|
off = PtrOffset(hdr, before);
|
|
|
|
ok:
|
|
/* Now we just make room for the entry and jam it in. */
|
|
memmove(Add2Ptr(before, de_size), before, used - off);
|
|
|
|
hdr->used = cpu_to_le32(used + de_size);
|
|
memcpy(before, de, de_size);
|
|
|
|
return before;
|
|
}
|
|
|
|
/*
|
|
* hdr_delete_de - Remove an entry from the index buffer.
|
|
*/
|
|
static inline struct NTFS_DE *hdr_delete_de(struct INDEX_HDR *hdr,
|
|
struct NTFS_DE *re)
|
|
{
|
|
u32 used = le32_to_cpu(hdr->used);
|
|
u16 esize = le16_to_cpu(re->size);
|
|
u32 off = PtrOffset(hdr, re);
|
|
int bytes = used - (off + esize);
|
|
|
|
/* check INDEX_HDR valid before using INDEX_HDR */
|
|
if (!check_index_header(hdr, le32_to_cpu(hdr->total)))
|
|
return NULL;
|
|
|
|
if (off >= used || esize < sizeof(struct NTFS_DE) ||
|
|
bytes < sizeof(struct NTFS_DE))
|
|
return NULL;
|
|
|
|
hdr->used = cpu_to_le32(used - esize);
|
|
memmove(re, Add2Ptr(re, esize), bytes);
|
|
|
|
return re;
|
|
}
|
|
|
|
void indx_clear(struct ntfs_index *indx)
|
|
{
|
|
run_close(&indx->alloc_run);
|
|
run_close(&indx->bitmap_run);
|
|
}
|
|
|
|
int indx_init(struct ntfs_index *indx, struct ntfs_sb_info *sbi,
|
|
const struct ATTRIB *attr, enum index_mutex_classed type)
|
|
{
|
|
u32 t32;
|
|
const struct INDEX_ROOT *root = resident_data(attr);
|
|
|
|
t32 = le32_to_cpu(attr->res.data_size);
|
|
if (t32 <= offsetof(struct INDEX_ROOT, ihdr) ||
|
|
!index_hdr_check(&root->ihdr,
|
|
t32 - offsetof(struct INDEX_ROOT, ihdr))) {
|
|
goto out;
|
|
}
|
|
|
|
/* Check root fields. */
|
|
if (!root->index_block_clst)
|
|
goto out;
|
|
|
|
indx->type = type;
|
|
indx->idx2vbn_bits = __ffs(root->index_block_clst);
|
|
|
|
t32 = le32_to_cpu(root->index_block_size);
|
|
indx->index_bits = blksize_bits(t32);
|
|
|
|
/* Check index record size. */
|
|
if (t32 < sbi->cluster_size) {
|
|
/* Index record is smaller than a cluster, use 512 blocks. */
|
|
if (t32 != root->index_block_clst * SECTOR_SIZE)
|
|
goto out;
|
|
|
|
/* Check alignment to a cluster. */
|
|
if ((sbi->cluster_size >> SECTOR_SHIFT) &
|
|
(root->index_block_clst - 1)) {
|
|
goto out;
|
|
}
|
|
|
|
indx->vbn2vbo_bits = SECTOR_SHIFT;
|
|
} else {
|
|
/* Index record must be a multiple of cluster size. */
|
|
if (t32 != root->index_block_clst << sbi->cluster_bits)
|
|
goto out;
|
|
|
|
indx->vbn2vbo_bits = sbi->cluster_bits;
|
|
}
|
|
|
|
init_rwsem(&indx->run_lock);
|
|
|
|
indx->cmp = get_cmp_func(root);
|
|
if (!indx->cmp)
|
|
goto out;
|
|
|
|
return 0;
|
|
|
|
out:
|
|
ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct indx_node *indx_new(struct ntfs_index *indx,
|
|
struct ntfs_inode *ni, CLST vbn,
|
|
const __le64 *sub_vbn)
|
|
{
|
|
int err;
|
|
struct NTFS_DE *e;
|
|
struct indx_node *r;
|
|
struct INDEX_HDR *hdr;
|
|
struct INDEX_BUFFER *index;
|
|
u64 vbo = (u64)vbn << indx->vbn2vbo_bits;
|
|
u32 bytes = 1u << indx->index_bits;
|
|
u16 fn;
|
|
u32 eo;
|
|
|
|
r = kzalloc(sizeof(struct indx_node), GFP_NOFS);
|
|
if (!r)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
index = kzalloc(bytes, GFP_NOFS);
|
|
if (!index) {
|
|
kfree(r);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
err = ntfs_get_bh(ni->mi.sbi, &indx->alloc_run, vbo, bytes, &r->nb);
|
|
|
|
if (err) {
|
|
kfree(index);
|
|
kfree(r);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/* Create header. */
|
|
index->rhdr.sign = NTFS_INDX_SIGNATURE;
|
|
index->rhdr.fix_off = cpu_to_le16(sizeof(struct INDEX_BUFFER)); // 0x28
|
|
fn = (bytes >> SECTOR_SHIFT) + 1; // 9
|
|
index->rhdr.fix_num = cpu_to_le16(fn);
|
|
index->vbn = cpu_to_le64(vbn);
|
|
hdr = &index->ihdr;
|
|
eo = ALIGN(sizeof(struct INDEX_BUFFER) + fn * sizeof(short), 8);
|
|
hdr->de_off = cpu_to_le32(eo);
|
|
|
|
e = Add2Ptr(hdr, eo);
|
|
|
|
if (sub_vbn) {
|
|
e->flags = NTFS_IE_LAST | NTFS_IE_HAS_SUBNODES;
|
|
e->size = cpu_to_le16(sizeof(struct NTFS_DE) + sizeof(u64));
|
|
hdr->used =
|
|
cpu_to_le32(eo + sizeof(struct NTFS_DE) + sizeof(u64));
|
|
de_set_vbn_le(e, *sub_vbn);
|
|
hdr->flags = 1;
|
|
} else {
|
|
e->size = cpu_to_le16(sizeof(struct NTFS_DE));
|
|
hdr->used = cpu_to_le32(eo + sizeof(struct NTFS_DE));
|
|
e->flags = NTFS_IE_LAST;
|
|
}
|
|
|
|
hdr->total = cpu_to_le32(bytes - offsetof(struct INDEX_BUFFER, ihdr));
|
|
|
|
r->index = index;
|
|
return r;
|
|
}
|
|
|
|
struct INDEX_ROOT *indx_get_root(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
struct ATTRIB **attr, struct mft_inode **mi)
|
|
{
|
|
struct ATTR_LIST_ENTRY *le = NULL;
|
|
struct ATTRIB *a;
|
|
const struct INDEX_NAMES *in = &s_index_names[indx->type];
|
|
struct INDEX_ROOT *root;
|
|
|
|
a = ni_find_attr(ni, NULL, &le, ATTR_ROOT, in->name, in->name_len, NULL,
|
|
mi);
|
|
if (!a)
|
|
return NULL;
|
|
|
|
if (attr)
|
|
*attr = a;
|
|
|
|
root = resident_data_ex(a, sizeof(struct INDEX_ROOT));
|
|
|
|
/* length check */
|
|
if (root &&
|
|
offsetof(struct INDEX_ROOT, ihdr) + le32_to_cpu(root->ihdr.used) >
|
|
le32_to_cpu(a->res.data_size)) {
|
|
return NULL;
|
|
}
|
|
|
|
return root;
|
|
}
|
|
|
|
static int indx_write(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
struct indx_node *node, int sync)
|
|
{
|
|
struct INDEX_BUFFER *ib = node->index;
|
|
|
|
return ntfs_write_bh(ni->mi.sbi, &ib->rhdr, &node->nb, sync);
|
|
}
|
|
|
|
/*
|
|
* indx_read
|
|
*
|
|
* If ntfs_readdir calls this function
|
|
* inode is shared locked and no ni_lock.
|
|
* Use rw_semaphore for read/write access to alloc_run.
|
|
*/
|
|
int indx_read(struct ntfs_index *indx, struct ntfs_inode *ni, CLST vbn,
|
|
struct indx_node **node)
|
|
{
|
|
int err;
|
|
struct INDEX_BUFFER *ib;
|
|
struct runs_tree *run = &indx->alloc_run;
|
|
struct rw_semaphore *lock = &indx->run_lock;
|
|
u64 vbo = (u64)vbn << indx->vbn2vbo_bits;
|
|
u32 bytes = 1u << indx->index_bits;
|
|
struct indx_node *in = *node;
|
|
const struct INDEX_NAMES *name;
|
|
|
|
if (!in) {
|
|
in = kzalloc(sizeof(struct indx_node), GFP_NOFS);
|
|
if (!in)
|
|
return -ENOMEM;
|
|
} else {
|
|
nb_put(&in->nb);
|
|
}
|
|
|
|
ib = in->index;
|
|
if (!ib) {
|
|
ib = kmalloc(bytes, GFP_NOFS);
|
|
if (!ib) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
down_read(lock);
|
|
err = ntfs_read_bh(ni->mi.sbi, run, vbo, &ib->rhdr, bytes, &in->nb);
|
|
up_read(lock);
|
|
if (!err)
|
|
goto ok;
|
|
|
|
if (err == -E_NTFS_FIXUP)
|
|
goto ok;
|
|
|
|
if (err != -ENOENT)
|
|
goto out;
|
|
|
|
name = &s_index_names[indx->type];
|
|
down_write(lock);
|
|
err = attr_load_runs_range(ni, ATTR_ALLOC, name->name, name->name_len,
|
|
run, vbo, vbo + bytes);
|
|
up_write(lock);
|
|
if (err)
|
|
goto out;
|
|
|
|
down_read(lock);
|
|
err = ntfs_read_bh(ni->mi.sbi, run, vbo, &ib->rhdr, bytes, &in->nb);
|
|
up_read(lock);
|
|
if (err == -E_NTFS_FIXUP)
|
|
goto ok;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
ok:
|
|
if (!index_buf_check(ib, bytes, &vbn)) {
|
|
ntfs_inode_err(&ni->vfs_inode, "directory corrupted");
|
|
ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_ERROR);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (err == -E_NTFS_FIXUP) {
|
|
ntfs_write_bh(ni->mi.sbi, &ib->rhdr, &in->nb, 0);
|
|
err = 0;
|
|
}
|
|
|
|
/* check for index header length */
|
|
if (offsetof(struct INDEX_BUFFER, ihdr) + le32_to_cpu(ib->ihdr.used) >
|
|
bytes) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
in->index = ib;
|
|
*node = in;
|
|
|
|
out:
|
|
if (ib != in->index)
|
|
kfree(ib);
|
|
|
|
if (*node != in) {
|
|
nb_put(&in->nb);
|
|
kfree(in);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_find - Scan NTFS directory for given entry.
|
|
*/
|
|
int indx_find(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const struct INDEX_ROOT *root, const void *key, size_t key_len,
|
|
const void *ctx, int *diff, struct NTFS_DE **entry,
|
|
struct ntfs_fnd *fnd)
|
|
{
|
|
int err;
|
|
struct NTFS_DE *e;
|
|
struct indx_node *node;
|
|
|
|
if (!root)
|
|
root = indx_get_root(&ni->dir, ni, NULL, NULL);
|
|
|
|
if (!root) {
|
|
/* Should not happen. */
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check cache. */
|
|
e = fnd->level ? fnd->de[fnd->level - 1] : fnd->root_de;
|
|
if (e && !de_is_last(e) &&
|
|
!(*indx->cmp)(key, key_len, e + 1, le16_to_cpu(e->key_size), ctx)) {
|
|
*entry = e;
|
|
*diff = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Soft finder reset. */
|
|
fnd_clear(fnd);
|
|
|
|
/* Lookup entry that is <= to the search value. */
|
|
e = hdr_find_e(indx, &root->ihdr, key, key_len, ctx, diff);
|
|
if (!e)
|
|
return -EINVAL;
|
|
|
|
fnd->root_de = e;
|
|
|
|
for (;;) {
|
|
node = NULL;
|
|
if (*diff >= 0 || !de_has_vcn_ex(e))
|
|
break;
|
|
|
|
/* Read next level. */
|
|
err = indx_read(indx, ni, de_get_vbn(e), &node);
|
|
if (err) {
|
|
/* io error? */
|
|
return err;
|
|
}
|
|
|
|
/* Lookup entry that is <= to the search value. */
|
|
e = hdr_find_e(indx, &node->index->ihdr, key, key_len, ctx,
|
|
diff);
|
|
if (!e) {
|
|
put_indx_node(node);
|
|
return -EINVAL;
|
|
}
|
|
|
|
fnd_push(fnd, node, e);
|
|
}
|
|
|
|
*entry = e;
|
|
return 0;
|
|
}
|
|
|
|
int indx_find_sort(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const struct INDEX_ROOT *root, struct NTFS_DE **entry,
|
|
struct ntfs_fnd *fnd)
|
|
{
|
|
int err;
|
|
struct indx_node *n = NULL;
|
|
struct NTFS_DE *e;
|
|
size_t iter = 0;
|
|
int level = fnd->level;
|
|
|
|
if (!*entry) {
|
|
/* Start find. */
|
|
e = hdr_first_de(&root->ihdr);
|
|
if (!e)
|
|
return 0;
|
|
fnd_clear(fnd);
|
|
fnd->root_de = e;
|
|
} else if (!level) {
|
|
if (de_is_last(fnd->root_de)) {
|
|
*entry = NULL;
|
|
return 0;
|
|
}
|
|
|
|
e = hdr_next_de(&root->ihdr, fnd->root_de);
|
|
if (!e)
|
|
return -EINVAL;
|
|
fnd->root_de = e;
|
|
} else {
|
|
n = fnd->nodes[level - 1];
|
|
e = fnd->de[level - 1];
|
|
|
|
if (de_is_last(e))
|
|
goto pop_level;
|
|
|
|
e = hdr_next_de(&n->index->ihdr, e);
|
|
if (!e)
|
|
return -EINVAL;
|
|
|
|
fnd->de[level - 1] = e;
|
|
}
|
|
|
|
/* Just to avoid tree cycle. */
|
|
next_iter:
|
|
if (iter++ >= 1000)
|
|
return -EINVAL;
|
|
|
|
while (de_has_vcn_ex(e)) {
|
|
if (le16_to_cpu(e->size) <
|
|
sizeof(struct NTFS_DE) + sizeof(u64)) {
|
|
if (n) {
|
|
fnd_pop(fnd);
|
|
kfree(n);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Read next level. */
|
|
err = indx_read(indx, ni, de_get_vbn(e), &n);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Try next level. */
|
|
e = hdr_first_de(&n->index->ihdr);
|
|
if (!e) {
|
|
kfree(n);
|
|
return -EINVAL;
|
|
}
|
|
|
|
fnd_push(fnd, n, e);
|
|
}
|
|
|
|
if (le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) {
|
|
*entry = e;
|
|
return 0;
|
|
}
|
|
|
|
pop_level:
|
|
for (;;) {
|
|
if (!de_is_last(e))
|
|
goto next_iter;
|
|
|
|
/* Pop one level. */
|
|
if (n) {
|
|
fnd_pop(fnd);
|
|
kfree(n);
|
|
}
|
|
|
|
level = fnd->level;
|
|
|
|
if (level) {
|
|
n = fnd->nodes[level - 1];
|
|
e = fnd->de[level - 1];
|
|
} else if (fnd->root_de) {
|
|
n = NULL;
|
|
e = fnd->root_de;
|
|
fnd->root_de = NULL;
|
|
} else {
|
|
*entry = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) {
|
|
*entry = e;
|
|
if (!fnd->root_de)
|
|
fnd->root_de = e;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
int indx_find_raw(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const struct INDEX_ROOT *root, struct NTFS_DE **entry,
|
|
size_t *off, struct ntfs_fnd *fnd)
|
|
{
|
|
int err;
|
|
struct indx_node *n = NULL;
|
|
struct NTFS_DE *e = NULL;
|
|
struct NTFS_DE *e2;
|
|
size_t bit;
|
|
CLST next_used_vbn;
|
|
CLST next_vbn;
|
|
u32 record_size = ni->mi.sbi->record_size;
|
|
|
|
/* Use non sorted algorithm. */
|
|
if (!*entry) {
|
|
/* This is the first call. */
|
|
e = hdr_first_de(&root->ihdr);
|
|
if (!e)
|
|
return 0;
|
|
fnd_clear(fnd);
|
|
fnd->root_de = e;
|
|
|
|
/* The first call with setup of initial element. */
|
|
if (*off >= record_size) {
|
|
next_vbn = (((*off - record_size) >> indx->index_bits))
|
|
<< indx->idx2vbn_bits;
|
|
/* Jump inside cycle 'for'. */
|
|
goto next;
|
|
}
|
|
|
|
/* Start enumeration from root. */
|
|
*off = 0;
|
|
} else if (!fnd->root_de)
|
|
return -EINVAL;
|
|
|
|
for (;;) {
|
|
/* Check if current entry can be used. */
|
|
if (e && le16_to_cpu(e->size) > sizeof(struct NTFS_DE))
|
|
goto ok;
|
|
|
|
if (!fnd->level) {
|
|
/* Continue to enumerate root. */
|
|
if (!de_is_last(fnd->root_de)) {
|
|
e = hdr_next_de(&root->ihdr, fnd->root_de);
|
|
if (!e)
|
|
return -EINVAL;
|
|
fnd->root_de = e;
|
|
continue;
|
|
}
|
|
|
|
/* Start to enumerate indexes from 0. */
|
|
next_vbn = 0;
|
|
} else {
|
|
/* Continue to enumerate indexes. */
|
|
e2 = fnd->de[fnd->level - 1];
|
|
|
|
n = fnd->nodes[fnd->level - 1];
|
|
|
|
if (!de_is_last(e2)) {
|
|
e = hdr_next_de(&n->index->ihdr, e2);
|
|
if (!e)
|
|
return -EINVAL;
|
|
fnd->de[fnd->level - 1] = e;
|
|
continue;
|
|
}
|
|
|
|
/* Continue with next index. */
|
|
next_vbn = le64_to_cpu(n->index->vbn) +
|
|
root->index_block_clst;
|
|
}
|
|
|
|
next:
|
|
/* Release current index. */
|
|
if (n) {
|
|
fnd_pop(fnd);
|
|
put_indx_node(n);
|
|
n = NULL;
|
|
}
|
|
|
|
/* Skip all free indexes. */
|
|
bit = next_vbn >> indx->idx2vbn_bits;
|
|
err = indx_used_bit(indx, ni, &bit);
|
|
if (err == -ENOENT || bit == MINUS_ONE_T) {
|
|
/* No used indexes. */
|
|
*entry = NULL;
|
|
return 0;
|
|
}
|
|
|
|
next_used_vbn = bit << indx->idx2vbn_bits;
|
|
|
|
/* Read buffer into memory. */
|
|
err = indx_read(indx, ni, next_used_vbn, &n);
|
|
if (err)
|
|
return err;
|
|
|
|
e = hdr_first_de(&n->index->ihdr);
|
|
fnd_push(fnd, n, e);
|
|
if (!e)
|
|
return -EINVAL;
|
|
}
|
|
|
|
ok:
|
|
/* Return offset to restore enumerator if necessary. */
|
|
if (!n) {
|
|
/* 'e' points in root, */
|
|
*off = PtrOffset(&root->ihdr, e);
|
|
} else {
|
|
/* 'e' points in index, */
|
|
*off = (le64_to_cpu(n->index->vbn) << indx->vbn2vbo_bits) +
|
|
record_size + PtrOffset(&n->index->ihdr, e);
|
|
}
|
|
|
|
*entry = e;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* indx_create_allocate - Create "Allocation + Bitmap" attributes.
|
|
*/
|
|
static int indx_create_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
CLST *vbn)
|
|
{
|
|
int err;
|
|
struct ntfs_sb_info *sbi = ni->mi.sbi;
|
|
struct ATTRIB *bitmap;
|
|
struct ATTRIB *alloc;
|
|
u32 data_size = 1u << indx->index_bits;
|
|
u32 alloc_size = ntfs_up_cluster(sbi, data_size);
|
|
CLST len = alloc_size >> sbi->cluster_bits;
|
|
const struct INDEX_NAMES *in = &s_index_names[indx->type];
|
|
CLST alen;
|
|
struct runs_tree run;
|
|
|
|
run_init(&run);
|
|
|
|
err = attr_allocate_clusters(sbi, &run, 0, 0, len, NULL, ALLOCATE_DEF,
|
|
&alen, 0, NULL, NULL);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = ni_insert_nonresident(ni, ATTR_ALLOC, in->name, in->name_len,
|
|
&run, 0, len, 0, &alloc, NULL, NULL);
|
|
if (err)
|
|
goto out1;
|
|
|
|
alloc->nres.valid_size = alloc->nres.data_size = cpu_to_le64(data_size);
|
|
|
|
err = ni_insert_resident(ni, bitmap_size(1), ATTR_BITMAP, in->name,
|
|
in->name_len, &bitmap, NULL, NULL);
|
|
if (err)
|
|
goto out2;
|
|
|
|
if (in->name == I30_NAME) {
|
|
ni->vfs_inode.i_size = data_size;
|
|
inode_set_bytes(&ni->vfs_inode, alloc_size);
|
|
}
|
|
|
|
memcpy(&indx->alloc_run, &run, sizeof(run));
|
|
|
|
*vbn = 0;
|
|
|
|
return 0;
|
|
|
|
out2:
|
|
mi_remove_attr(NULL, &ni->mi, alloc);
|
|
|
|
out1:
|
|
run_deallocate(sbi, &run, false);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_add_allocate - Add clusters to index.
|
|
*/
|
|
static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
CLST *vbn)
|
|
{
|
|
int err;
|
|
size_t bit;
|
|
u64 data_size;
|
|
u64 bmp_size, bmp_size_v;
|
|
struct ATTRIB *bmp, *alloc;
|
|
struct mft_inode *mi;
|
|
const struct INDEX_NAMES *in = &s_index_names[indx->type];
|
|
|
|
err = indx_find_free(indx, ni, &bit, &bmp);
|
|
if (err)
|
|
goto out1;
|
|
|
|
if (bit != MINUS_ONE_T) {
|
|
bmp = NULL;
|
|
} else {
|
|
if (bmp->non_res) {
|
|
bmp_size = le64_to_cpu(bmp->nres.data_size);
|
|
bmp_size_v = le64_to_cpu(bmp->nres.valid_size);
|
|
} else {
|
|
bmp_size = bmp_size_v = le32_to_cpu(bmp->res.data_size);
|
|
}
|
|
|
|
bit = bmp_size << 3;
|
|
}
|
|
|
|
data_size = (u64)(bit + 1) << indx->index_bits;
|
|
|
|
if (bmp) {
|
|
/* Increase bitmap. */
|
|
err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
|
|
&indx->bitmap_run, bitmap_size(bit + 1),
|
|
NULL, true, NULL);
|
|
if (err)
|
|
goto out1;
|
|
}
|
|
|
|
alloc = ni_find_attr(ni, NULL, NULL, ATTR_ALLOC, in->name, in->name_len,
|
|
NULL, &mi);
|
|
if (!alloc) {
|
|
err = -EINVAL;
|
|
if (bmp)
|
|
goto out2;
|
|
goto out1;
|
|
}
|
|
|
|
/* Increase allocation. */
|
|
err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
|
|
&indx->alloc_run, data_size, &data_size, true,
|
|
NULL);
|
|
if (err) {
|
|
if (bmp)
|
|
goto out2;
|
|
goto out1;
|
|
}
|
|
|
|
if (in->name == I30_NAME)
|
|
ni->vfs_inode.i_size = data_size;
|
|
|
|
*vbn = bit << indx->idx2vbn_bits;
|
|
|
|
return 0;
|
|
|
|
out2:
|
|
/* Ops. No space? */
|
|
attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
|
|
&indx->bitmap_run, bmp_size, &bmp_size_v, false, NULL);
|
|
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_insert_into_root - Attempt to insert an entry into the index root.
|
|
*
|
|
* @undo - True if we undoing previous remove.
|
|
* If necessary, it will twiddle the index b-tree.
|
|
*/
|
|
static int indx_insert_into_root(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const struct NTFS_DE *new_de,
|
|
struct NTFS_DE *root_de, const void *ctx,
|
|
struct ntfs_fnd *fnd, bool undo)
|
|
{
|
|
int err = 0;
|
|
struct NTFS_DE *e, *e0, *re;
|
|
struct mft_inode *mi;
|
|
struct ATTRIB *attr;
|
|
struct INDEX_HDR *hdr;
|
|
struct indx_node *n;
|
|
CLST new_vbn;
|
|
__le64 *sub_vbn, t_vbn;
|
|
u16 new_de_size;
|
|
u32 hdr_used, hdr_total, asize, to_move;
|
|
u32 root_size, new_root_size;
|
|
struct ntfs_sb_info *sbi;
|
|
int ds_root;
|
|
struct INDEX_ROOT *root, *a_root;
|
|
|
|
/* Get the record this root placed in. */
|
|
root = indx_get_root(indx, ni, &attr, &mi);
|
|
if (!root)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Try easy case:
|
|
* hdr_insert_de will succeed if there's
|
|
* room the root for the new entry.
|
|
*/
|
|
hdr = &root->ihdr;
|
|
sbi = ni->mi.sbi;
|
|
new_de_size = le16_to_cpu(new_de->size);
|
|
hdr_used = le32_to_cpu(hdr->used);
|
|
hdr_total = le32_to_cpu(hdr->total);
|
|
asize = le32_to_cpu(attr->size);
|
|
root_size = le32_to_cpu(attr->res.data_size);
|
|
|
|
ds_root = new_de_size + hdr_used - hdr_total;
|
|
|
|
/* If 'undo' is set then reduce requirements. */
|
|
if ((undo || asize + ds_root < sbi->max_bytes_per_attr) &&
|
|
mi_resize_attr(mi, attr, ds_root)) {
|
|
hdr->total = cpu_to_le32(hdr_total + ds_root);
|
|
e = hdr_insert_de(indx, hdr, new_de, root_de, ctx);
|
|
WARN_ON(!e);
|
|
fnd_clear(fnd);
|
|
fnd->root_de = e;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Make a copy of root attribute to restore if error. */
|
|
a_root = kmemdup(attr, asize, GFP_NOFS);
|
|
if (!a_root)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Copy all the non-end entries from
|
|
* the index root to the new buffer.
|
|
*/
|
|
to_move = 0;
|
|
e0 = hdr_first_de(hdr);
|
|
|
|
/* Calculate the size to copy. */
|
|
for (e = e0;; e = hdr_next_de(hdr, e)) {
|
|
if (!e) {
|
|
err = -EINVAL;
|
|
goto out_free_root;
|
|
}
|
|
|
|
if (de_is_last(e))
|
|
break;
|
|
to_move += le16_to_cpu(e->size);
|
|
}
|
|
|
|
if (!to_move) {
|
|
re = NULL;
|
|
} else {
|
|
re = kmemdup(e0, to_move, GFP_NOFS);
|
|
if (!re) {
|
|
err = -ENOMEM;
|
|
goto out_free_root;
|
|
}
|
|
}
|
|
|
|
sub_vbn = NULL;
|
|
if (de_has_vcn(e)) {
|
|
t_vbn = de_get_vbn_le(e);
|
|
sub_vbn = &t_vbn;
|
|
}
|
|
|
|
new_root_size = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE) +
|
|
sizeof(u64);
|
|
ds_root = new_root_size - root_size;
|
|
|
|
if (ds_root > 0 && asize + ds_root > sbi->max_bytes_per_attr) {
|
|
/* Make root external. */
|
|
err = -EOPNOTSUPP;
|
|
goto out_free_re;
|
|
}
|
|
|
|
if (ds_root)
|
|
mi_resize_attr(mi, attr, ds_root);
|
|
|
|
/* Fill first entry (vcn will be set later). */
|
|
e = (struct NTFS_DE *)(root + 1);
|
|
memset(e, 0, sizeof(struct NTFS_DE));
|
|
e->size = cpu_to_le16(sizeof(struct NTFS_DE) + sizeof(u64));
|
|
e->flags = NTFS_IE_HAS_SUBNODES | NTFS_IE_LAST;
|
|
|
|
hdr->flags = 1;
|
|
hdr->used = hdr->total =
|
|
cpu_to_le32(new_root_size - offsetof(struct INDEX_ROOT, ihdr));
|
|
|
|
fnd->root_de = hdr_first_de(hdr);
|
|
mi->dirty = true;
|
|
|
|
/* Create alloc and bitmap attributes (if not). */
|
|
err = run_is_empty(&indx->alloc_run) ?
|
|
indx_create_allocate(indx, ni, &new_vbn) :
|
|
indx_add_allocate(indx, ni, &new_vbn);
|
|
|
|
/* Layout of record may be changed, so rescan root. */
|
|
root = indx_get_root(indx, ni, &attr, &mi);
|
|
if (!root) {
|
|
/* Bug? */
|
|
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
|
|
err = -EINVAL;
|
|
goto out_free_re;
|
|
}
|
|
|
|
if (err) {
|
|
/* Restore root. */
|
|
if (mi_resize_attr(mi, attr, -ds_root)) {
|
|
memcpy(attr, a_root, asize);
|
|
} else {
|
|
/* Bug? */
|
|
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
|
|
}
|
|
goto out_free_re;
|
|
}
|
|
|
|
e = (struct NTFS_DE *)(root + 1);
|
|
*(__le64 *)(e + 1) = cpu_to_le64(new_vbn);
|
|
mi->dirty = true;
|
|
|
|
/* Now we can create/format the new buffer and copy the entries into. */
|
|
n = indx_new(indx, ni, new_vbn, sub_vbn);
|
|
if (IS_ERR(n)) {
|
|
err = PTR_ERR(n);
|
|
goto out_free_re;
|
|
}
|
|
|
|
hdr = &n->index->ihdr;
|
|
hdr_used = le32_to_cpu(hdr->used);
|
|
hdr_total = le32_to_cpu(hdr->total);
|
|
|
|
/* Copy root entries into new buffer. */
|
|
hdr_insert_head(hdr, re, to_move);
|
|
|
|
/* Update bitmap attribute. */
|
|
indx_mark_used(indx, ni, new_vbn >> indx->idx2vbn_bits);
|
|
|
|
/* Check if we can insert new entry new index buffer. */
|
|
if (hdr_used + new_de_size > hdr_total) {
|
|
/*
|
|
* This occurs if MFT record is the same or bigger than index
|
|
* buffer. Move all root new index and have no space to add
|
|
* new entry classic case when MFT record is 1K and index
|
|
* buffer 4K the problem should not occurs.
|
|
*/
|
|
kfree(re);
|
|
indx_write(indx, ni, n, 0);
|
|
|
|
put_indx_node(n);
|
|
fnd_clear(fnd);
|
|
err = indx_insert_entry(indx, ni, new_de, ctx, fnd, undo);
|
|
goto out_free_root;
|
|
}
|
|
|
|
/*
|
|
* Now root is a parent for new index buffer.
|
|
* Insert NewEntry a new buffer.
|
|
*/
|
|
e = hdr_insert_de(indx, hdr, new_de, NULL, ctx);
|
|
if (!e) {
|
|
err = -EINVAL;
|
|
goto out_put_n;
|
|
}
|
|
fnd_push(fnd, n, e);
|
|
|
|
/* Just write updates index into disk. */
|
|
indx_write(indx, ni, n, 0);
|
|
|
|
n = NULL;
|
|
|
|
out_put_n:
|
|
put_indx_node(n);
|
|
out_free_re:
|
|
kfree(re);
|
|
out_free_root:
|
|
kfree(a_root);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_insert_into_buffer
|
|
*
|
|
* Attempt to insert an entry into an Index Allocation Buffer.
|
|
* If necessary, it will split the buffer.
|
|
*/
|
|
static int
|
|
indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
struct INDEX_ROOT *root, const struct NTFS_DE *new_de,
|
|
const void *ctx, int level, struct ntfs_fnd *fnd)
|
|
{
|
|
int err;
|
|
const struct NTFS_DE *sp;
|
|
struct NTFS_DE *e, *de_t, *up_e;
|
|
struct indx_node *n2;
|
|
struct indx_node *n1 = fnd->nodes[level];
|
|
struct INDEX_HDR *hdr1 = &n1->index->ihdr;
|
|
struct INDEX_HDR *hdr2;
|
|
u32 to_copy, used, used1;
|
|
CLST new_vbn;
|
|
__le64 t_vbn, *sub_vbn;
|
|
u16 sp_size;
|
|
void *hdr1_saved = NULL;
|
|
|
|
/* Try the most easy case. */
|
|
e = fnd->level - 1 == level ? fnd->de[level] : NULL;
|
|
e = hdr_insert_de(indx, hdr1, new_de, e, ctx);
|
|
fnd->de[level] = e;
|
|
if (e) {
|
|
/* Just write updated index into disk. */
|
|
indx_write(indx, ni, n1, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* No space to insert into buffer. Split it.
|
|
* To split we:
|
|
* - Save split point ('cause index buffers will be changed)
|
|
* - Allocate NewBuffer and copy all entries <= sp into new buffer
|
|
* - Remove all entries (sp including) from TargetBuffer
|
|
* - Insert NewEntry into left or right buffer (depending on sp <=>
|
|
* NewEntry)
|
|
* - Insert sp into parent buffer (or root)
|
|
* - Make sp a parent for new buffer
|
|
*/
|
|
sp = hdr_find_split(hdr1);
|
|
if (!sp)
|
|
return -EINVAL;
|
|
|
|
sp_size = le16_to_cpu(sp->size);
|
|
up_e = kmalloc(sp_size + sizeof(u64), GFP_NOFS);
|
|
if (!up_e)
|
|
return -ENOMEM;
|
|
memcpy(up_e, sp, sp_size);
|
|
|
|
used1 = le32_to_cpu(hdr1->used);
|
|
hdr1_saved = kmemdup(hdr1, used1, GFP_NOFS);
|
|
if (!hdr1_saved) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (!hdr1->flags) {
|
|
up_e->flags |= NTFS_IE_HAS_SUBNODES;
|
|
up_e->size = cpu_to_le16(sp_size + sizeof(u64));
|
|
sub_vbn = NULL;
|
|
} else {
|
|
t_vbn = de_get_vbn_le(up_e);
|
|
sub_vbn = &t_vbn;
|
|
}
|
|
|
|
/* Allocate on disk a new index allocation buffer. */
|
|
err = indx_add_allocate(indx, ni, &new_vbn);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Allocate and format memory a new index buffer. */
|
|
n2 = indx_new(indx, ni, new_vbn, sub_vbn);
|
|
if (IS_ERR(n2)) {
|
|
err = PTR_ERR(n2);
|
|
goto out;
|
|
}
|
|
|
|
hdr2 = &n2->index->ihdr;
|
|
|
|
/* Make sp a parent for new buffer. */
|
|
de_set_vbn(up_e, new_vbn);
|
|
|
|
/* Copy all the entries <= sp into the new buffer. */
|
|
de_t = hdr_first_de(hdr1);
|
|
to_copy = PtrOffset(de_t, sp);
|
|
hdr_insert_head(hdr2, de_t, to_copy);
|
|
|
|
/* Remove all entries (sp including) from hdr1. */
|
|
used = used1 - to_copy - sp_size;
|
|
memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off));
|
|
hdr1->used = cpu_to_le32(used);
|
|
|
|
/*
|
|
* Insert new entry into left or right buffer
|
|
* (depending on sp <=> new_de).
|
|
*/
|
|
hdr_insert_de(indx,
|
|
(*indx->cmp)(new_de + 1, le16_to_cpu(new_de->key_size),
|
|
up_e + 1, le16_to_cpu(up_e->key_size),
|
|
ctx) < 0 ?
|
|
hdr2 :
|
|
hdr1,
|
|
new_de, NULL, ctx);
|
|
|
|
indx_mark_used(indx, ni, new_vbn >> indx->idx2vbn_bits);
|
|
|
|
indx_write(indx, ni, n1, 0);
|
|
indx_write(indx, ni, n2, 0);
|
|
|
|
put_indx_node(n2);
|
|
|
|
/*
|
|
* We've finished splitting everybody, so we are ready to
|
|
* insert the promoted entry into the parent.
|
|
*/
|
|
if (!level) {
|
|
/* Insert in root. */
|
|
err = indx_insert_into_root(indx, ni, up_e, NULL, ctx, fnd, 0);
|
|
} else {
|
|
/*
|
|
* The target buffer's parent is another index buffer.
|
|
* TODO: Remove recursion.
|
|
*/
|
|
err = indx_insert_into_buffer(indx, ni, root, up_e, ctx,
|
|
level - 1, fnd);
|
|
}
|
|
|
|
if (err) {
|
|
/*
|
|
* Undo critical operations.
|
|
*/
|
|
indx_mark_free(indx, ni, new_vbn >> indx->idx2vbn_bits);
|
|
memcpy(hdr1, hdr1_saved, used1);
|
|
indx_write(indx, ni, n1, 0);
|
|
}
|
|
|
|
out:
|
|
kfree(up_e);
|
|
kfree(hdr1_saved);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_insert_entry - Insert new entry into index.
|
|
*
|
|
* @undo - True if we undoing previous remove.
|
|
*/
|
|
int indx_insert_entry(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const struct NTFS_DE *new_de, const void *ctx,
|
|
struct ntfs_fnd *fnd, bool undo)
|
|
{
|
|
int err;
|
|
int diff;
|
|
struct NTFS_DE *e;
|
|
struct ntfs_fnd *fnd_a = NULL;
|
|
struct INDEX_ROOT *root;
|
|
|
|
if (!fnd) {
|
|
fnd_a = fnd_get();
|
|
if (!fnd_a) {
|
|
err = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
fnd = fnd_a;
|
|
}
|
|
|
|
root = indx_get_root(indx, ni, NULL, NULL);
|
|
if (!root) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (fnd_is_empty(fnd)) {
|
|
/*
|
|
* Find the spot the tree where we want to
|
|
* insert the new entry.
|
|
*/
|
|
err = indx_find(indx, ni, root, new_de + 1,
|
|
le16_to_cpu(new_de->key_size), ctx, &diff, &e,
|
|
fnd);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!diff) {
|
|
err = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (!fnd->level) {
|
|
/*
|
|
* The root is also a leaf, so we'll insert the
|
|
* new entry into it.
|
|
*/
|
|
err = indx_insert_into_root(indx, ni, new_de, fnd->root_de, ctx,
|
|
fnd, undo);
|
|
} else {
|
|
/*
|
|
* Found a leaf buffer, so we'll insert the new entry into it.
|
|
*/
|
|
err = indx_insert_into_buffer(indx, ni, root, new_de, ctx,
|
|
fnd->level - 1, fnd);
|
|
}
|
|
|
|
out:
|
|
fnd_put(fnd_a);
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_find_buffer - Locate a buffer from the tree.
|
|
*/
|
|
static struct indx_node *indx_find_buffer(struct ntfs_index *indx,
|
|
struct ntfs_inode *ni,
|
|
const struct INDEX_ROOT *root,
|
|
__le64 vbn, struct indx_node *n)
|
|
{
|
|
int err;
|
|
const struct NTFS_DE *e;
|
|
struct indx_node *r;
|
|
const struct INDEX_HDR *hdr = n ? &n->index->ihdr : &root->ihdr;
|
|
|
|
/* Step 1: Scan one level. */
|
|
for (e = hdr_first_de(hdr);; e = hdr_next_de(hdr, e)) {
|
|
if (!e)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (de_has_vcn(e) && vbn == de_get_vbn_le(e))
|
|
return n;
|
|
|
|
if (de_is_last(e))
|
|
break;
|
|
}
|
|
|
|
/* Step2: Do recursion. */
|
|
e = Add2Ptr(hdr, le32_to_cpu(hdr->de_off));
|
|
for (;;) {
|
|
if (de_has_vcn_ex(e)) {
|
|
err = indx_read(indx, ni, de_get_vbn(e), &n);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
r = indx_find_buffer(indx, ni, root, vbn, n);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
if (de_is_last(e))
|
|
break;
|
|
|
|
e = Add2Ptr(e, le16_to_cpu(e->size));
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* indx_shrink - Deallocate unused tail indexes.
|
|
*/
|
|
static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
size_t bit)
|
|
{
|
|
int err = 0;
|
|
u64 bpb, new_data;
|
|
size_t nbits;
|
|
struct ATTRIB *b;
|
|
struct ATTR_LIST_ENTRY *le = NULL;
|
|
const struct INDEX_NAMES *in = &s_index_names[indx->type];
|
|
|
|
b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
|
|
NULL, NULL);
|
|
|
|
if (!b)
|
|
return -ENOENT;
|
|
|
|
if (!b->non_res) {
|
|
unsigned long pos;
|
|
const unsigned long *bm = resident_data(b);
|
|
|
|
nbits = (size_t)le32_to_cpu(b->res.data_size) * 8;
|
|
|
|
if (bit >= nbits)
|
|
return 0;
|
|
|
|
pos = find_next_bit_le(bm, nbits, bit);
|
|
if (pos < nbits)
|
|
return 0;
|
|
} else {
|
|
size_t used = MINUS_ONE_T;
|
|
|
|
nbits = le64_to_cpu(b->nres.data_size) * 8;
|
|
|
|
if (bit >= nbits)
|
|
return 0;
|
|
|
|
err = scan_nres_bitmap(ni, b, indx, bit, &scan_for_used, &used);
|
|
if (err)
|
|
return err;
|
|
|
|
if (used != MINUS_ONE_T)
|
|
return 0;
|
|
}
|
|
|
|
new_data = (u64)bit << indx->index_bits;
|
|
|
|
err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
|
|
&indx->alloc_run, new_data, &new_data, false, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
if (in->name == I30_NAME)
|
|
ni->vfs_inode.i_size = new_data;
|
|
|
|
bpb = bitmap_size(bit);
|
|
if (bpb * 8 == nbits)
|
|
return 0;
|
|
|
|
err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
|
|
&indx->bitmap_run, bpb, &bpb, false, NULL);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int indx_free_children(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const struct NTFS_DE *e, bool trim)
|
|
{
|
|
int err;
|
|
struct indx_node *n = NULL;
|
|
struct INDEX_HDR *hdr;
|
|
CLST vbn = de_get_vbn(e);
|
|
size_t i;
|
|
|
|
err = indx_read(indx, ni, vbn, &n);
|
|
if (err)
|
|
return err;
|
|
|
|
hdr = &n->index->ihdr;
|
|
/* First, recurse into the children, if any. */
|
|
if (hdr_has_subnode(hdr)) {
|
|
for (e = hdr_first_de(hdr); e; e = hdr_next_de(hdr, e)) {
|
|
indx_free_children(indx, ni, e, false);
|
|
if (de_is_last(e))
|
|
break;
|
|
}
|
|
}
|
|
|
|
put_indx_node(n);
|
|
|
|
i = vbn >> indx->idx2vbn_bits;
|
|
/*
|
|
* We've gotten rid of the children; add this buffer to the free list.
|
|
*/
|
|
indx_mark_free(indx, ni, i);
|
|
|
|
if (!trim)
|
|
return 0;
|
|
|
|
/*
|
|
* If there are no used indexes after current free index
|
|
* then we can truncate allocation and bitmap.
|
|
* Use bitmap to estimate the case.
|
|
*/
|
|
indx_shrink(indx, ni, i + 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* indx_get_entry_to_replace
|
|
*
|
|
* Find a replacement entry for a deleted entry.
|
|
* Always returns a node entry:
|
|
* NTFS_IE_HAS_SUBNODES is set the flags and the size includes the sub_vcn.
|
|
*/
|
|
static int indx_get_entry_to_replace(struct ntfs_index *indx,
|
|
struct ntfs_inode *ni,
|
|
const struct NTFS_DE *de_next,
|
|
struct NTFS_DE **de_to_replace,
|
|
struct ntfs_fnd *fnd)
|
|
{
|
|
int err;
|
|
int level = -1;
|
|
CLST vbn;
|
|
struct NTFS_DE *e, *te, *re;
|
|
struct indx_node *n;
|
|
struct INDEX_BUFFER *ib;
|
|
|
|
*de_to_replace = NULL;
|
|
|
|
/* Find first leaf entry down from de_next. */
|
|
vbn = de_get_vbn(de_next);
|
|
for (;;) {
|
|
n = NULL;
|
|
err = indx_read(indx, ni, vbn, &n);
|
|
if (err)
|
|
goto out;
|
|
|
|
e = hdr_first_de(&n->index->ihdr);
|
|
fnd_push(fnd, n, e);
|
|
|
|
if (!de_is_last(e)) {
|
|
/*
|
|
* This buffer is non-empty, so its first entry
|
|
* could be used as the replacement entry.
|
|
*/
|
|
level = fnd->level - 1;
|
|
}
|
|
|
|
if (!de_has_vcn(e))
|
|
break;
|
|
|
|
/* This buffer is a node. Continue to go down. */
|
|
vbn = de_get_vbn(e);
|
|
}
|
|
|
|
if (level == -1)
|
|
goto out;
|
|
|
|
n = fnd->nodes[level];
|
|
te = hdr_first_de(&n->index->ihdr);
|
|
/* Copy the candidate entry into the replacement entry buffer. */
|
|
re = kmalloc(le16_to_cpu(te->size) + sizeof(u64), GFP_NOFS);
|
|
if (!re) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
*de_to_replace = re;
|
|
memcpy(re, te, le16_to_cpu(te->size));
|
|
|
|
if (!de_has_vcn(re)) {
|
|
/*
|
|
* The replacement entry we found doesn't have a sub_vcn.
|
|
* increase its size to hold one.
|
|
*/
|
|
le16_add_cpu(&re->size, sizeof(u64));
|
|
re->flags |= NTFS_IE_HAS_SUBNODES;
|
|
} else {
|
|
/*
|
|
* The replacement entry we found was a node entry, which
|
|
* means that all its child buffers are empty. Return them
|
|
* to the free pool.
|
|
*/
|
|
indx_free_children(indx, ni, te, true);
|
|
}
|
|
|
|
/*
|
|
* Expunge the replacement entry from its former location,
|
|
* and then write that buffer.
|
|
*/
|
|
ib = n->index;
|
|
e = hdr_delete_de(&ib->ihdr, te);
|
|
|
|
fnd->de[level] = e;
|
|
indx_write(indx, ni, n, 0);
|
|
|
|
if (ib_is_leaf(ib) && ib_is_empty(ib)) {
|
|
/* An empty leaf. */
|
|
return 0;
|
|
}
|
|
|
|
out:
|
|
fnd_clear(fnd);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* indx_delete_entry - Delete an entry from the index.
|
|
*/
|
|
int indx_delete_entry(struct ntfs_index *indx, struct ntfs_inode *ni,
|
|
const void *key, u32 key_len, const void *ctx)
|
|
{
|
|
int err, diff;
|
|
struct INDEX_ROOT *root;
|
|
struct INDEX_HDR *hdr;
|
|
struct ntfs_fnd *fnd, *fnd2;
|
|
struct INDEX_BUFFER *ib;
|
|
struct NTFS_DE *e, *re, *next, *prev, *me;
|
|
struct indx_node *n, *n2d = NULL;
|
|
__le64 sub_vbn;
|
|
int level, level2;
|
|
struct ATTRIB *attr;
|
|
struct mft_inode *mi;
|
|
u32 e_size, root_size, new_root_size;
|
|
size_t trim_bit;
|
|
const struct INDEX_NAMES *in;
|
|
|
|
fnd = fnd_get();
|
|
if (!fnd) {
|
|
err = -ENOMEM;
|
|
goto out2;
|
|
}
|
|
|
|
fnd2 = fnd_get();
|
|
if (!fnd2) {
|
|
err = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
root = indx_get_root(indx, ni, &attr, &mi);
|
|
if (!root) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Locate the entry to remove. */
|
|
err = indx_find(indx, ni, root, key, key_len, ctx, &diff, &e, fnd);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!e || diff) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
level = fnd->level;
|
|
|
|
if (level) {
|
|
n = fnd->nodes[level - 1];
|
|
e = fnd->de[level - 1];
|
|
ib = n->index;
|
|
hdr = &ib->ihdr;
|
|
} else {
|
|
hdr = &root->ihdr;
|
|
e = fnd->root_de;
|
|
n = NULL;
|
|
}
|
|
|
|
e_size = le16_to_cpu(e->size);
|
|
|
|
if (!de_has_vcn_ex(e)) {
|
|
/* The entry to delete is a leaf, so we can just rip it out. */
|
|
hdr_delete_de(hdr, e);
|
|
|
|
if (!level) {
|
|
hdr->total = hdr->used;
|
|
|
|
/* Shrink resident root attribute. */
|
|
mi_resize_attr(mi, attr, 0 - e_size);
|
|
goto out;
|
|
}
|
|
|
|
indx_write(indx, ni, n, 0);
|
|
|
|
/*
|
|
* Check to see if removing that entry made
|
|
* the leaf empty.
|
|
*/
|
|
if (ib_is_leaf(ib) && ib_is_empty(ib)) {
|
|
fnd_pop(fnd);
|
|
fnd_push(fnd2, n, e);
|
|
}
|
|
} else {
|
|
/*
|
|
* The entry we wish to delete is a node buffer, so we
|
|
* have to find a replacement for it.
|
|
*/
|
|
next = de_get_next(e);
|
|
|
|
err = indx_get_entry_to_replace(indx, ni, next, &re, fnd2);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (re) {
|
|
de_set_vbn_le(re, de_get_vbn_le(e));
|
|
hdr_delete_de(hdr, e);
|
|
|
|
err = level ? indx_insert_into_buffer(indx, ni, root,
|
|
re, ctx,
|
|
fnd->level - 1,
|
|
fnd) :
|
|
indx_insert_into_root(indx, ni, re, e,
|
|
ctx, fnd, 0);
|
|
kfree(re);
|
|
|
|
if (err)
|
|
goto out;
|
|
} else {
|
|
/*
|
|
* There is no replacement for the current entry.
|
|
* This means that the subtree rooted at its node
|
|
* is empty, and can be deleted, which turn means
|
|
* that the node can just inherit the deleted
|
|
* entry sub_vcn.
|
|
*/
|
|
indx_free_children(indx, ni, next, true);
|
|
|
|
de_set_vbn_le(next, de_get_vbn_le(e));
|
|
hdr_delete_de(hdr, e);
|
|
if (level) {
|
|
indx_write(indx, ni, n, 0);
|
|
} else {
|
|
hdr->total = hdr->used;
|
|
|
|
/* Shrink resident root attribute. */
|
|
mi_resize_attr(mi, attr, 0 - e_size);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Delete a branch of tree. */
|
|
if (!fnd2 || !fnd2->level)
|
|
goto out;
|
|
|
|
/* Reinit root 'cause it can be changed. */
|
|
root = indx_get_root(indx, ni, &attr, &mi);
|
|
if (!root) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
n2d = NULL;
|
|
sub_vbn = fnd2->nodes[0]->index->vbn;
|
|
level2 = 0;
|
|
level = fnd->level;
|
|
|
|
hdr = level ? &fnd->nodes[level - 1]->index->ihdr : &root->ihdr;
|
|
|
|
/* Scan current level. */
|
|
for (e = hdr_first_de(hdr);; e = hdr_next_de(hdr, e)) {
|
|
if (!e) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (de_has_vcn(e) && sub_vbn == de_get_vbn_le(e))
|
|
break;
|
|
|
|
if (de_is_last(e)) {
|
|
e = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!e) {
|
|
/* Do slow search from root. */
|
|
struct indx_node *in;
|
|
|
|
fnd_clear(fnd);
|
|
|
|
in = indx_find_buffer(indx, ni, root, sub_vbn, NULL);
|
|
if (IS_ERR(in)) {
|
|
err = PTR_ERR(in);
|
|
goto out;
|
|
}
|
|
|
|
if (in)
|
|
fnd_push(fnd, in, NULL);
|
|
}
|
|
|
|
/* Merge fnd2 -> fnd. */
|
|
for (level = 0; level < fnd2->level; level++) {
|
|
fnd_push(fnd, fnd2->nodes[level], fnd2->de[level]);
|
|
fnd2->nodes[level] = NULL;
|
|
}
|
|
fnd2->level = 0;
|
|
|
|
hdr = NULL;
|
|
for (level = fnd->level; level; level--) {
|
|
struct indx_node *in = fnd->nodes[level - 1];
|
|
|
|
ib = in->index;
|
|
if (ib_is_empty(ib)) {
|
|
sub_vbn = ib->vbn;
|
|
} else {
|
|
hdr = &ib->ihdr;
|
|
n2d = in;
|
|
level2 = level;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!hdr)
|
|
hdr = &root->ihdr;
|
|
|
|
e = hdr_first_de(hdr);
|
|
if (!e) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (hdr != &root->ihdr || !de_is_last(e)) {
|
|
prev = NULL;
|
|
while (!de_is_last(e)) {
|
|
if (de_has_vcn(e) && sub_vbn == de_get_vbn_le(e))
|
|
break;
|
|
prev = e;
|
|
e = hdr_next_de(hdr, e);
|
|
if (!e) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (sub_vbn != de_get_vbn_le(e)) {
|
|
/*
|
|
* Didn't find the parent entry, although this buffer
|
|
* is the parent trail. Something is corrupt.
|
|
*/
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (de_is_last(e)) {
|
|
/*
|
|
* Since we can't remove the end entry, we'll remove
|
|
* its predecessor instead. This means we have to
|
|
* transfer the predecessor's sub_vcn to the end entry.
|
|
* Note: This index block is not empty, so the
|
|
* predecessor must exist.
|
|
*/
|
|
if (!prev) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (de_has_vcn(prev)) {
|
|
de_set_vbn_le(e, de_get_vbn_le(prev));
|
|
} else if (de_has_vcn(e)) {
|
|
le16_sub_cpu(&e->size, sizeof(u64));
|
|
e->flags &= ~NTFS_IE_HAS_SUBNODES;
|
|
le32_sub_cpu(&hdr->used, sizeof(u64));
|
|
}
|
|
e = prev;
|
|
}
|
|
|
|
/*
|
|
* Copy the current entry into a temporary buffer (stripping
|
|
* off its down-pointer, if any) and delete it from the current
|
|
* buffer or root, as appropriate.
|
|
*/
|
|
e_size = le16_to_cpu(e->size);
|
|
me = kmemdup(e, e_size, GFP_NOFS);
|
|
if (!me) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (de_has_vcn(me)) {
|
|
me->flags &= ~NTFS_IE_HAS_SUBNODES;
|
|
le16_sub_cpu(&me->size, sizeof(u64));
|
|
}
|
|
|
|
hdr_delete_de(hdr, e);
|
|
|
|
if (hdr == &root->ihdr) {
|
|
level = 0;
|
|
hdr->total = hdr->used;
|
|
|
|
/* Shrink resident root attribute. */
|
|
mi_resize_attr(mi, attr, 0 - e_size);
|
|
} else {
|
|
indx_write(indx, ni, n2d, 0);
|
|
level = level2;
|
|
}
|
|
|
|
/* Mark unused buffers as free. */
|
|
trim_bit = -1;
|
|
for (; level < fnd->level; level++) {
|
|
ib = fnd->nodes[level]->index;
|
|
if (ib_is_empty(ib)) {
|
|
size_t k = le64_to_cpu(ib->vbn) >>
|
|
indx->idx2vbn_bits;
|
|
|
|
indx_mark_free(indx, ni, k);
|
|
if (k < trim_bit)
|
|
trim_bit = k;
|
|
}
|
|
}
|
|
|
|
fnd_clear(fnd);
|
|
/*fnd->root_de = NULL;*/
|
|
|
|
/*
|
|
* Re-insert the entry into the tree.
|
|
* Find the spot the tree where we want to insert the new entry.
|
|
*/
|
|
err = indx_insert_entry(indx, ni, me, ctx, fnd, 0);
|
|
kfree(me);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (trim_bit != -1)
|
|
indx_shrink(indx, ni, trim_bit);
|
|
} else {
|
|
/*
|
|
* This tree needs to be collapsed down to an empty root.
|
|
* Recreate the index root as an empty leaf and free all
|
|
* the bits the index allocation bitmap.
|
|
*/
|
|
fnd_clear(fnd);
|
|
fnd_clear(fnd2);
|
|
|
|
in = &s_index_names[indx->type];
|
|
|
|
err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
|
|
&indx->alloc_run, 0, NULL, false, NULL);
|
|
if (in->name == I30_NAME)
|
|
ni->vfs_inode.i_size = 0;
|
|
|
|
err = ni_remove_attr(ni, ATTR_ALLOC, in->name, in->name_len,
|
|
false, NULL);
|
|
run_close(&indx->alloc_run);
|
|
|
|
err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
|
|
&indx->bitmap_run, 0, NULL, false, NULL);
|
|
err = ni_remove_attr(ni, ATTR_BITMAP, in->name, in->name_len,
|
|
false, NULL);
|
|
run_close(&indx->bitmap_run);
|
|
|
|
root = indx_get_root(indx, ni, &attr, &mi);
|
|
if (!root) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
root_size = le32_to_cpu(attr->res.data_size);
|
|
new_root_size =
|
|
sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
|
|
|
|
if (new_root_size != root_size &&
|
|
!mi_resize_attr(mi, attr, new_root_size - root_size)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Fill first entry. */
|
|
e = (struct NTFS_DE *)(root + 1);
|
|
e->ref.low = 0;
|
|
e->ref.high = 0;
|
|
e->ref.seq = 0;
|
|
e->size = cpu_to_le16(sizeof(struct NTFS_DE));
|
|
e->flags = NTFS_IE_LAST; // 0x02
|
|
e->key_size = 0;
|
|
e->res = 0;
|
|
|
|
hdr = &root->ihdr;
|
|
hdr->flags = 0;
|
|
hdr->used = hdr->total = cpu_to_le32(
|
|
new_root_size - offsetof(struct INDEX_ROOT, ihdr));
|
|
mi->dirty = true;
|
|
}
|
|
|
|
out:
|
|
fnd_put(fnd2);
|
|
out1:
|
|
fnd_put(fnd);
|
|
out2:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Update duplicated information in directory entry
|
|
* 'dup' - info from MFT record
|
|
*/
|
|
int indx_update_dup(struct ntfs_inode *ni, struct ntfs_sb_info *sbi,
|
|
const struct ATTR_FILE_NAME *fname,
|
|
const struct NTFS_DUP_INFO *dup, int sync)
|
|
{
|
|
int err, diff;
|
|
struct NTFS_DE *e = NULL;
|
|
struct ATTR_FILE_NAME *e_fname;
|
|
struct ntfs_fnd *fnd;
|
|
struct INDEX_ROOT *root;
|
|
struct mft_inode *mi;
|
|
struct ntfs_index *indx = &ni->dir;
|
|
|
|
fnd = fnd_get();
|
|
if (!fnd)
|
|
return -ENOMEM;
|
|
|
|
root = indx_get_root(indx, ni, NULL, &mi);
|
|
if (!root) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Find entry in directory. */
|
|
err = indx_find(indx, ni, root, fname, fname_full_size(fname), sbi,
|
|
&diff, &e, fnd);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!e) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (diff) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
e_fname = (struct ATTR_FILE_NAME *)(e + 1);
|
|
|
|
if (!memcmp(&e_fname->dup, dup, sizeof(*dup))) {
|
|
/*
|
|
* Nothing to update in index! Try to avoid this call.
|
|
*/
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&e_fname->dup, dup, sizeof(*dup));
|
|
|
|
if (fnd->level) {
|
|
/* Directory entry in index. */
|
|
err = indx_write(indx, ni, fnd->nodes[fnd->level - 1], sync);
|
|
} else {
|
|
/* Directory entry in directory MFT record. */
|
|
mi->dirty = true;
|
|
if (sync)
|
|
err = mi_write(mi, 1);
|
|
else
|
|
mark_inode_dirty(&ni->vfs_inode);
|
|
}
|
|
|
|
out:
|
|
fnd_put(fnd);
|
|
return err;
|
|
}
|