1ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross/* 2ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * Copyright (C) 2010 The Android Open Source Project 3ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * 4ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * Licensed under the Apache License, Version 2.0 (the "License"); 5ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * you may not use this file except in compliance with the License. 6ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * You may obtain a copy of the License at 7ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * 8ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * http://www.apache.org/licenses/LICENSE-2.0 9ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * 10ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * Unless required by applicable law or agreed to in writing, software 11ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * distributed under the License is distributed on an "AS IS" BASIS, 12ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * See the License for the specific language governing permissions and 14ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross * limitations under the License. 15ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross */ 16ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 17ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include <sys/stat.h> 18ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include <string.h> 19ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include <stdio.h> 208a63232ae7d992c148b75a03d83df5c2188935fcNick Kralevich 218a63232ae7d992c148b75a03d83df5c2188935fcNick Kralevich#ifdef HAVE_ANDROID_OS 224df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich#include <linux/capability.h> 233ebdcb8f9378320ec126bb130f167b7b4908e605Nick Kralevich#else 248a63232ae7d992c148b75a03d83df5c2188935fcNick Kralevich#include <private/android_filesystem_capability.h> 258a63232ae7d992c148b75a03d83df5c2188935fcNick Kralevich#endif 263ebdcb8f9378320ec126bb130f167b7b4908e605Nick Kralevich 273ebdcb8f9378320ec126bb130f167b7b4908e605Nick Kralevich#define XATTR_SELINUX_SUFFIX "selinux" 283ebdcb8f9378320ec126bb130f167b7b4908e605Nick Kralevich#define XATTR_CAPS_SUFFIX "capability" 29ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 30ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "ext4_utils.h" 31ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "ext4.h" 32ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "make_ext4fs.h" 33ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "allocate.h" 34ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "contents.h" 35ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "extent.h" 36ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross#include "indirect.h" 37b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley#include "xattr.h" 38ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 394605b3fb8a00fa37f617a8d0fe3a095d0503a845Raphael Moll#ifdef USE_MINGW 404605b3fb8a00fa37f617a8d0fe3a095d0503a845Raphael Moll#define S_IFLNK 0 /* used by make_link, not needed under mingw */ 414605b3fb8a00fa37f617a8d0fe3a095d0503a845Raphael Moll#endif 424605b3fb8a00fa37f617a8d0fe3a095d0503a845Raphael Moll 43ec0a2e83dc66d67addeb90e83144187691852a3eColin Crossstatic u32 dentry_size(u32 entries, struct dentry *dentries) 44ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross{ 45ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 len = 24; 46ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross unsigned int i; 476bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross unsigned int dentry_len; 48ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 49ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross for (i = 0; i < entries; i++) { 506bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross dentry_len = 8 + ALIGN(strlen(dentries[i].filename), 4); 51ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (len % info.block_size + dentry_len > info.block_size) 52ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross len += info.block_size - (len % info.block_size); 53ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross len += dentry_len; 54ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 55ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 56ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return len; 57ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross} 58ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 59ec0a2e83dc66d67addeb90e83144187691852a3eColin Crossstatic struct ext4_dir_entry_2 *add_dentry(u8 *data, u32 *offset, 60ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_dir_entry_2 *prev, u32 inode, const char *name, 61ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u8 file_type) 62ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross{ 63ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u8 name_len = strlen(name); 646bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross u16 rec_len = 8 + ALIGN(name_len, 4); 65ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_dir_entry_2 *dentry; 66ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 67ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 start_block = *offset / info.block_size; 682ff1c5b6e8c1457dbb65fb8305db92c74e95dd42Colin Cross u32 end_block = (*offset + rec_len - 1) / info.block_size; 69ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (start_block != end_block) { 70ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross /* Adding this dentry will cross a block boundary, so pad the previous 71ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry to the block boundary */ 72ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (!prev) 73ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross critical_error("no prev"); 74ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross prev->rec_len += end_block * info.block_size - *offset; 75ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross *offset = end_block * info.block_size; 76ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 77ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 78ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry = (struct ext4_dir_entry_2 *)(data + *offset); 79ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry->inode = inode; 80ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry->rec_len = rec_len; 81ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry->name_len = name_len; 82ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry->file_type = file_type; 83ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross memcpy(dentry->name, name, name_len); 84ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 85ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross *offset += rec_len; 86ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return dentry; 87ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross} 88ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 89ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross/* Creates a directory structure for an array of directory entries, dentries, 90ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross and stores the location of the structure in an inode. The new inode's 91ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross .. link is set to dir_inode_num. Stores the location of the inode number 92ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross of each directory entry into dentries[i].inode, to be filled in later 93ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross when the inode for the entry is allocated. Returns the inode number of the 94ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross new directory */ 95ec0a2e83dc66d67addeb90e83144187691852a3eColin Crossu32 make_directory(u32 dir_inode_num, u32 entries, struct dentry *dentries, 968aef66d2125af8de7672a12895276802fcc1948fColin Cross u32 dirs) 97ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross{ 98ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_inode *inode; 996bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross u32 blocks; 1006bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross u32 len; 101ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 offset = 0; 102ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 inode_num; 103ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u8 *data; 104ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross unsigned int i; 105ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_dir_entry_2 *dentry; 106ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 1076bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross blocks = DIV_ROUND_UP(dentry_size(entries, dentries), info.block_size); 1086bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross len = blocks * info.block_size; 1096bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross 110ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (dir_inode_num) { 111ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode_num = allocate_inode(info); 112ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } else { 113ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dir_inode_num = EXT4_ROOT_INO; 114ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode_num = EXT4_ROOT_INO; 115ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 116ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 117ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (inode_num == EXT4_ALLOCATE_FAILED) { 118ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to allocate inode\n"); 119ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 120ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 121ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 122ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross add_directory(inode_num); 123ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 124ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode = get_inode(inode_num); 125ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (inode == NULL) { 126ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to get inode %u", inode_num); 127ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 128ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 129ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 130ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross data = inode_allocate_data_extents(inode, len, len); 131ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (data == NULL) { 1322e905e5f2a3df605c68cb8633580c918e9f4ba71Colin Cross error("failed to allocate %u extents", len); 133ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 134ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 135ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 136ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_mode = S_IFDIR; 137ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_links_count = dirs + 2; 138ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_flags |= aux_info.default_i_flags; 139ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 140ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry = NULL; 141ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 142ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry = add_dentry(data, &offset, NULL, inode_num, ".", EXT4_FT_DIR); 143ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (!dentry) { 144ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to add . directory"); 145ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 146ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 147ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 148ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentry = add_dentry(data, &offset, dentry, dir_inode_num, "..", EXT4_FT_DIR); 149ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (!dentry) { 150ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to add .. directory"); 151ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 152ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 153ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 154ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross for (i = 0; i < entries; i++) { 1556bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross dentry = add_dentry(data, &offset, dentry, 0, 1566bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross dentries[i].filename, dentries[i].file_type); 1576bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross if (offset > len || (offset == len && i != entries - 1)) 1586bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross critical_error("internal error: dentry for %s ends at %d, past %d\n", 1596bd2b5d80db5630cb73e3e5a4be3b38afa241c5aColin Cross dentries[i].filename, offset, len); 160ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross dentries[i].inode = &dentry->inode; 161ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (!dentry) { 162ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to add directory"); 163ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 164ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 165ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 166ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 1678748938228acad9e53c4f3cdfa132d2aff7917bfColin Cross /* pad the last dentry out to the end of the block */ 1688748938228acad9e53c4f3cdfa132d2aff7917bfColin Cross dentry->rec_len += len - offset; 169ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 170ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return inode_num; 171ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross} 172ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 173ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross/* Creates a file on disk. Returns the inode number of the new file */ 174ec0a2e83dc66d67addeb90e83144187691852a3eColin Crossu32 make_file(const char *filename, u64 len) 175ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross{ 176ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_inode *inode; 177ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 inode_num; 178ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 179ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode_num = allocate_inode(info); 180ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (inode_num == EXT4_ALLOCATE_FAILED) { 181ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to allocate inode\n"); 182ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 183ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 184ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 185ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode = get_inode(inode_num); 186ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (inode == NULL) { 187ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to get inode %u", inode_num); 188ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 189ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 190ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 191cf5c39c1851f8826264822414dbab31c1aeaeec6Colin Cross if (len > 0) 192cf5c39c1851f8826264822414dbab31c1aeaeec6Colin Cross inode_allocate_file_extents(inode, len, filename); 193ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 194ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_mode = S_IFREG; 195ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_links_count = 1; 196ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_flags |= aux_info.default_i_flags; 197ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 198ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return inode_num; 199ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross} 200ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 201ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross/* Creates a file on disk. Returns the inode number of the new file */ 2025446bde9c02f6ae95a30d9c178b13a05bb580fe1Nick Kralevichu32 make_link(const char *link) 203ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross{ 204ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_inode *inode; 205ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 inode_num; 206ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u32 len = strlen(link); 207ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 208ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode_num = allocate_inode(info); 209ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (inode_num == EXT4_ALLOCATE_FAILED) { 210ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to allocate inode\n"); 211ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 212ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 213ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 214ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode = get_inode(inode_num); 215ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (inode == NULL) { 216ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross error("failed to get inode %u", inode_num); 217ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return EXT4_ALLOCATE_FAILED; 218ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 219ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 220ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_mode = S_IFLNK; 221ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_links_count = 1; 222ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_flags |= aux_info.default_i_flags; 223ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_size_lo = len; 224ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 225ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (len + 1 <= sizeof(inode->i_block)) { 226ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross /* Fast symlink */ 227ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross memcpy((char*)inode->i_block, link, len); 228ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } else { 229ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross u8 *data = inode_allocate_data_indirect(inode, info.block_size, info.block_size); 230ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross memcpy(data, link, len); 231ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_blocks_lo = info.block_size / 512; 232ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross } 233ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 234ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return inode_num; 235ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross} 236ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 237de61f980c7b034eefac6e0ace718b3c1eb3f6252Colin Crossint inode_set_permissions(u32 inode_num, u16 mode, u16 uid, u16 gid, u32 mtime) 238ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross{ 239ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross struct ext4_inode *inode = get_inode(inode_num); 240ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 241ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross if (!inode) 242ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return -1; 243ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 244ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_mode |= mode; 245ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_uid = uid; 246ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross inode->i_gid = gid; 247de61f980c7b034eefac6e0ace718b3c1eb3f6252Colin Cross inode->i_mtime = mtime; 248de61f980c7b034eefac6e0ace718b3c1eb3f6252Colin Cross inode->i_atime = mtime; 249de61f980c7b034eefac6e0ace718b3c1eb3f6252Colin Cross inode->i_ctime = mtime; 250ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross 251ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross return 0; 252ec0a2e83dc66d67addeb90e83144187691852a3eColin Cross} 253b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley 2544df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich/* 2554df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * Returns the amount of free space available in the specified 2564df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * xattr region 2574df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich */ 2584df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic size_t xattr_free_space(struct ext4_xattr_entry *entry, char *end) 2594df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 2604df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich while(!IS_LAST_ENTRY(entry) && (((char *) entry) < end)) { 2614df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich end -= EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); 2624df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich entry = EXT4_XATTR_NEXT(entry); 2634df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 264b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley 2654df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (((char *) entry) > end) { 2664df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich error("unexpected read beyond end of xattr space"); 2674df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return 0; 2684df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 269b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley 2704df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return end - ((char *) entry); 2714df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 2724df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 2734df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich/* 2744df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * Returns a pointer to the free space immediately after the 2754df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * last xattr element 2764df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich */ 2774df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic struct ext4_xattr_entry* xattr_get_last(struct ext4_xattr_entry *entry) 278b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley{ 2794df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 2804df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich // skip entry 2814df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 2824df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return entry; 2834df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 284b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley 2854df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich/* 2864df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * assert that the elements in the ext4 xattr section are in sorted order 2874df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * 2884df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * The ext4 filesystem requires extended attributes to be sorted when 2894df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * they're not stored in the inode. The kernel ext4 code uses the following 2904df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * sorting algorithm: 2914df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * 2924df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * 1) First sort extended attributes by their name_index. For example, 2934df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * EXT4_XATTR_INDEX_USER (1) comes before EXT4_XATTR_INDEX_SECURITY (6). 2944df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * 2) If the name_indexes are equal, then sorting is based on the length 2954df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * of the name. For example, XATTR_SELINUX_SUFFIX ("selinux") comes before 2964df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * XATTR_CAPS_SUFFIX ("capability") because "selinux" is shorter than "capability" 2974df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * 3) If the name_index and name_length are equal, then memcmp() is used to determine 2984df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * which name comes first. For example, "selinux" would come before "yelinux". 2994df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * 3004df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * This method is intended to implement the sorting function defined in 3014df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich * the Linux kernel file fs/ext4/xattr.c function ext4_xattr_find_entry(). 3024df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich */ 3034df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic void xattr_assert_sane(struct ext4_xattr_entry *entry) 3044df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 3054df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich for( ; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 3064df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); 3074df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (IS_LAST_ENTRY(next)) { 3084df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return; 3094df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3104df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3114df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich int cmp = next->e_name_index - entry->e_name_index; 3124df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (cmp == 0) 3134df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cmp = next->e_name_len - entry->e_name_len; 3144df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (cmp == 0) 3154df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cmp = memcmp(next->e_name, entry->e_name, next->e_name_len); 3164df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (cmp < 0) { 3174df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich error("BUG: extended attributes are not sorted\n"); 3184df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return; 3194df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3204df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (cmp == 0) { 3214df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich error("BUG: duplicate extended attributes detected\n"); 3224df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return; 3234df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3244df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3254df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 3264df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3274df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich#define NAME_HASH_SHIFT 5 3284df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich#define VALUE_HASH_SHIFT 16 3294df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3304df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 3314df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *entry) 3324df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 3334df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich __u32 hash = 0; 3344df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich char *name = entry->e_name; 3354df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich int n; 3364df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3374df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich for (n = 0; n < entry->e_name_len; n++) { 3384df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich hash = (hash << NAME_HASH_SHIFT) ^ 3394df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3404df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich *name++; 3414df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3424df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3434df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (entry->e_value_block == 0 && entry->e_value_size != 0) { 3444df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich __le32 *value = (__le32 *)((char *)header + 3454df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich le16_to_cpu(entry->e_value_offs)); 3464df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich for (n = (le32_to_cpu(entry->e_value_size) + 3474df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 3484df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich hash = (hash << VALUE_HASH_SHIFT) ^ 3494df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3504df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich le32_to_cpu(*value++); 3514df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3524df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 3534df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich entry->e_hash = cpu_to_le32(hash); 3544df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 3554df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3564df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich#undef NAME_HASH_SHIFT 3574df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich#undef VALUE_HASH_SHIFT 3584df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3594df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic struct ext4_xattr_entry* xattr_addto_range( 3604df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich void *block_start, 3614df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich void *block_end, 3624df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *first, 3634df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich int name_index, 3644df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich const char *name, 3654df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich const void *value, 3664df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich size_t value_len) 3674df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 3684df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich size_t name_len = strlen(name); 3694df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (name_len > 255) 3704df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return NULL; 3714df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3724df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich size_t available_size = xattr_free_space(first, block_end); 3734df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich size_t needed_size = EXT4_XATTR_LEN(name_len) + EXT4_XATTR_SIZE(value_len); 3744df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3754df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (needed_size > available_size) 3764df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return NULL; 3774df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3784df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *new_entry = xattr_get_last(first); 3794df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich memset(new_entry, 0, EXT4_XATTR_LEN(name_len)); 3804df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3814df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich new_entry->e_name_len = name_len; 3824df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich new_entry->e_name_index = name_index; 3834df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich memcpy(new_entry->e_name, name, name_len); 3844df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich new_entry->e_value_block = 0; 3854df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich new_entry->e_value_size = cpu_to_le32(value_len); 3864df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3874df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich char *val = (char *) new_entry + available_size - EXT4_XATTR_SIZE(value_len); 3884df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich size_t e_value_offs = val - (char *) block_start; 3894df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3904df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich new_entry->e_value_offs = cpu_to_le16(e_value_offs); 3914df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich memset(val, 0, EXT4_XATTR_SIZE(value_len)); 3924df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich memcpy(val, value, value_len); 3934df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3944df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich xattr_assert_sane(first); 3954df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return new_entry; 3964df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 3974df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 3984df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic int xattr_addto_inode(struct ext4_inode *inode, int name_index, 3994df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich const char *name, const void *value, size_t value_len) 4004df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 4014df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_ibody_header *hdr = (struct ext4_xattr_ibody_header *) (inode + 1); 4024df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *first = (struct ext4_xattr_entry *) (hdr + 1); 4034df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich char *block_end = ((char *) inode) + info.inode_size; 4044df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4054df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *result = 4064df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich xattr_addto_range(first, block_end, first, name_index, name, value, value_len); 4074df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4084df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (result == NULL) 409b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley return -1; 410b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley 4114df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich hdr->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 412b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley inode->i_extra_isize = cpu_to_le16(sizeof(struct ext4_inode) - EXT4_GOOD_OLD_INODE_SIZE); 413b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley 414b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley return 0; 415b4eca4b24af9c80ebb2a7fa2ba539a48096b7576Stephen Smalley} 4164df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4174df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic int xattr_addto_block(struct ext4_inode *inode, int name_index, 4184df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich const char *name, const void *value, size_t value_len) 4194df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 4204df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_header *header = get_xattr_block_for_inode(inode); 4214df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (!header) 4224df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return -1; 4234df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4244df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *first = (struct ext4_xattr_entry *) (header + 1); 4254df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich char *block_end = ((char *) header) + info.block_size; 4264df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4274df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_xattr_entry *result = 4284df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich xattr_addto_range(header, block_end, first, name_index, name, value, value_len); 4294df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4304df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (result == NULL) 4314df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return -1; 4324df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4334df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich ext4_xattr_hash_entry(header, result); 4344df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return 0; 4354df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 4364df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4374df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4384df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichstatic int xattr_add(u32 inode_num, int name_index, const char *name, 4394df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich const void *value, size_t value_len) 4404df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 4414df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (!value) 4424df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return 0; 4434df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4444df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct ext4_inode *inode = get_inode(inode_num); 4454df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4464df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (!inode) 4474df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return -1; 4484df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4494df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich int result = xattr_addto_inode(inode, name_index, name, value, value_len); 4504df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (result != 0) { 4514df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich result = xattr_addto_block(inode, name_index, name, value, value_len); 4524df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich } 4534df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return result; 4544df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 4554df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4564df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichint inode_set_selinux(u32 inode_num, const char *secon) 4574df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich{ 458192238d9081d4ad8c090a77e8e1d40b66e8fae4aSungmin Choi if (!secon) 459192238d9081d4ad8c090a77e8e1d40b66e8fae4aSungmin Choi return 0; 460192238d9081d4ad8c090a77e8e1d40b66e8fae4aSungmin Choi 4614df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return xattr_add(inode_num, EXT4_XATTR_INDEX_SECURITY, 4624df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich XATTR_SELINUX_SUFFIX, secon, strlen(secon) + 1); 4634df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 4644df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4654df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevichint inode_set_capabilities(u32 inode_num, uint64_t capabilities) { 4664df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich if (capabilities == 0) 4674df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return 0; 4684df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4694df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich struct vfs_cap_data cap_data; 4704df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich memset(&cap_data, 0, sizeof(cap_data)); 4714df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4724df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cap_data.magic_etc = VFS_CAP_REVISION | VFS_CAP_FLAGS_EFFECTIVE; 4734df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cap_data.data[0].permitted = (uint32_t) (capabilities & 0xffffffff); 4744df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cap_data.data[0].inheritable = 0; 4754df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cap_data.data[1].permitted = (uint32_t) (capabilities >> 32); 4764df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich cap_data.data[1].inheritable = 0; 4774df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 4784df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich return xattr_add(inode_num, EXT4_XATTR_INDEX_SECURITY, 4794df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich XATTR_CAPS_SUFFIX, &cap_data, sizeof(cap_data)); 4804df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich} 4814df62f342dbbe2f5cca831ce789dc0426d32ec03Nick Kralevich 482