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| 1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 * Use of this source code is governed by a BSD-style license that can be | |
| 3 * found in the LICENSE file. | |
| 4 */ | |
| 5 #include "nacl_mounts/mount_mem.h" | |
| 6 | |
| 7 #include <errno.h> | |
| 8 #include <fcntl.h> | |
| 9 #include <string> | |
| 10 | |
| 11 #include "nacl_mounts/mount.h" | |
| 12 #include "nacl_mounts/mount_node.h" | |
| 13 #include "nacl_mounts/mount_node_dir.h" | |
| 14 #include "nacl_mounts/mount_node_mem.h" | |
| 15 #include "nacl_mounts/osstat.h" | |
| 16 #include "nacl_mounts/path.h" | |
| 17 #include "utils/auto_lock.h" | |
| 18 #include "utils/ref_object.h" | |
| 19 | |
| 20 // TODO(noelallen) : Grab/Redefine these in the kernel object once available. | |
| 21 #define USR_ID 1002 | |
| 22 #define GRP_ID 1003 | |
| 23 | |
| 24 MountMem::MountMem() | |
| 25 : root_(NULL), | |
| 26 max_ino_(0) { | |
| 27 } | |
| 28 | |
| 29 bool MountMem::Init(int dev, StringMap_t& args, PepperInterface* ppapi) { | |
| 30 Mount::Init(dev, args, ppapi); | |
| 31 root_ = AllocatePath(S_IREAD | S_IWRITE); | |
| 32 return (bool) (root_ != NULL); | |
| 33 } | |
| 34 | |
| 35 void MountMem::Destroy() { | |
| 36 if (root_) | |
| 37 root_->Release(); | |
| 38 root_ = NULL; | |
| 39 } | |
| 40 | |
| 41 MountNode* MountMem::AllocatePath(int mode) { | |
| 42 MountNode *ptr = new MountNodeDir(this); | |
| 43 if (!ptr->Init(mode)) { | |
| 44 ptr->Release(); | |
| 45 return NULL; | |
| 46 } | |
| 47 return ptr; | |
| 48 } | |
| 49 | |
| 50 MountNode* MountMem::AllocateData(int mode) { | |
| 51 MountNode* ptr = new MountNodeMem(this); | |
| 52 if (!ptr->Init(mode)) { | |
| 53 ptr->Release(); | |
| 54 return NULL; | |
| 55 } | |
| 56 return ptr; | |
| 57 } | |
| 58 | |
| 59 MountNode* MountMem::FindNode(const Path& path, int type) { | |
| 60 MountNode* node = root_; | |
| 61 | |
| 62 // If there is no root there, we have an error. | |
| 63 if (node == NULL) { | |
| 64 errno = ENOTDIR; | |
| 65 return NULL; | |
| 66 } | |
| 67 | |
| 68 // We are expecting an "absolute" path from this mount point. | |
| 69 if (!path.IsAbsolute()) { | |
| 70 errno = EINVAL; | |
| 71 return NULL; | |
| 72 } | |
| 73 | |
| 74 // Starting at the root, traverse the path parts. | |
| 75 for (size_t index = 1; node && index < path.Size(); index++) { | |
| 76 // If not a directory, then we have an error so return. | |
| 77 if (!node->IsaDir()) { | |
| 78 errno = ENOTDIR; | |
| 79 return NULL; | |
| 80 } | |
| 81 | |
| 82 // Find the child node | |
| 83 node = node->FindChild(path.Part(index)); | |
| 84 } | |
| 85 | |
| 86 // node should be root, a found child, or a failed 'FindChild' | |
| 87 // which already has the correct errno set. | |
| 88 if (NULL == node) return NULL; | |
| 89 | |
| 90 // If a directory is expected, but it's not a directory, then fail. | |
| 91 if ((type & S_IFDIR) && !node->IsaDir()) { | |
| 92 errno = ENOTDIR; | |
| 93 return NULL; | |
| 94 } | |
| 95 | |
| 96 // If a file is expected, but it's not a file, then fail. | |
| 97 if ((type & S_IFREG) && node->IsaDir()) { | |
| 98 errno = EISDIR; | |
| 99 return NULL; | |
| 100 } | |
| 101 | |
| 102 // We now have a valid object of the expected type, so return it. | |
| 103 return node; | |
| 104 } | |
| 105 | |
| 106 MountNode* MountMem::Open(const Path& path, int mode) { | |
| 107 AutoLock lock(&lock_); | |
| 108 MountNode* node = FindNode(path); | |
| 109 | |
| 110 if (NULL == node) { | |
| 111 // Now first find the parent directory to see if we can add it | |
| 112 MountNode* parent = FindNode(path.Parent(), S_IFDIR); | |
| 113 if (NULL == parent) return NULL; | |
| 114 | |
| 115 // If the node does not exist and we can't create it, fail | |
| 116 if ((mode & O_CREAT) == 0) return NULL; | |
| 117 | |
| 118 // Otherwise, create it with a single refernece | |
| 119 mode = OpenModeToPermission(mode); | |
| 120 node = AllocateData(mode); | |
| 121 if (NULL == node) return NULL; | |
| 122 | |
| 123 if (parent->AddChild(path.Basename(), node) == -1) { | |
| 124 // Or if it fails, release it | |
| 125 node->Release(); | |
| 126 return NULL; | |
| 127 } | |
| 128 return node; | |
| 129 } | |
| 130 | |
| 131 // If we were expected to create it exclusively, fail | |
| 132 if (mode & O_EXCL) { | |
| 133 errno = EEXIST; | |
| 134 return NULL; | |
| 135 } | |
| 136 | |
| 137 // Verify we got the requested permisions. | |
| 138 int req_mode = OpenModeToPermission(mode); | |
| 139 int obj_mode = node->GetMode() & OpenModeToPermission(O_RDWR); | |
| 140 if ((obj_mode & req_mode) != req_mode) { | |
| 141 errno = EACCES; | |
| 142 return NULL; | |
| 143 } | |
| 144 | |
| 145 // We opened it, so ref count it before passing it back. | |
| 146 node->Acquire(); | |
| 147 return node; | |
| 148 } | |
| 149 | |
| 150 int MountMem::Mkdir(const Path& path, int mode) { | |
| 151 AutoLock lock(&lock_); | |
| 152 | |
| 153 // We expect a Mount "absolute" path | |
| 154 if (!path.IsAbsolute()) { | |
| 155 errno = ENOENT; | |
| 156 return -1; | |
| 157 } | |
| 158 | |
| 159 // The root of the mount is already created by the mount | |
| 160 if (path.Size() == 1) { | |
| 161 errno = EEXIST; | |
| 162 return -1; | |
| 163 } | |
| 164 | |
| 165 MountNode* parent = FindNode(path.Parent(), S_IFDIR); | |
| 166 MountNode* node; | |
| 167 | |
| 168 // If we failed to find the parent, the error code is already set. | |
| 169 if (NULL == parent) return -1; | |
| 170 | |
| 171 node = parent->FindChild(path.Basename()); | |
| 172 if (NULL != node) { | |
| 173 errno = EEXIST; | |
| 174 return -1; | |
| 175 } | |
| 176 | |
| 177 // Otherwise, create a new node and attempt to add it | |
| 178 mode = OpenModeToPermission(mode); | |
| 179 | |
| 180 // Allocate a node, with a RefCount of 1. If added to the parent | |
| 181 // it will get ref counted again. In either case, release the | |
| 182 // recount we have on exit. | |
| 183 node = AllocatePath(S_IREAD | S_IWRITE); | |
| 184 if (NULL == node) return -1; | |
| 185 | |
| 186 if (parent->AddChild(path.Basename(), node) == -1) { | |
| 187 node->Release(); | |
| 188 return -1; | |
| 189 } | |
| 190 | |
| 191 node->Release(); | |
| 192 return 0; | |
| 193 } | |
| 194 | |
| 195 int MountMem::Unlink(const Path& path) { | |
| 196 return RemoveInternal(path, REMOVE_FILE); | |
| 197 } | |
| 198 | |
| 199 int MountMem::Rmdir(const Path& path) { | |
| 200 return RemoveInternal(path, REMOVE_DIR); | |
| 201 } | |
| 202 | |
| 203 int MountMem::Remove(const Path& path) { | |
| 204 return RemoveInternal(path, REMOVE_ALL); | |
| 205 } | |
| 206 | |
| 207 int MountMem::RemoveInternal(const Path& path, int remove_type) { | |
| 208 AutoLock lock(&lock_); | |
| 209 bool dir_only = remove_type == REMOVE_DIR; | |
| 210 bool file_only = remove_type == REMOVE_FILE; | |
| 211 bool remove_dir = (remove_type & REMOVE_DIR) != 0; | |
| 212 | |
| 213 if (dir_only) { | |
| 214 // We expect a Mount "absolute" path | |
| 215 if (!path.IsAbsolute()) { | |
| 216 errno = ENOENT; | |
| 217 return -1; | |
| 218 } | |
| 219 | |
| 220 // The root of the mount is already created by the mount | |
| 221 if (path.Size() == 1) { | |
| 222 errno = EEXIST; | |
| 223 return -1; | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 MountNode* parent = FindNode(path.Parent(), S_IFDIR); | |
| 228 | |
| 229 // If we failed to find the parent, the error code is already set. | |
| 230 if (NULL == parent) return -1; | |
| 231 | |
| 232 // Verify we find a child which is a directory. | |
| 233 MountNode* child = parent->FindChild(path.Basename()); | |
| 234 if (NULL == child) { | |
| 235 errno = ENOENT; | |
| 236 return -1; | |
| 237 } | |
| 238 if (dir_only && !child->IsaDir()) { | |
| 239 errno = ENOTDIR; | |
| 240 return -1; | |
| 241 } | |
| 242 if (file_only && child->IsaDir()) { | |
| 243 errno = EISDIR; | |
| 244 return -1; | |
| 245 } | |
| 246 if (remove_dir && child->ChildCount() > 0) { | |
| 247 errno = ENOTEMPTY; | |
| 248 return -1; | |
| 249 } | |
| 250 return parent->RemoveChild(path.Basename()); | |
| 251 } | |
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