106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
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#include "Path.h"
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#include "kprintf.h"
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#include "debug.h"
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#include "Dentry.h"
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#include "VfsMount.h"
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#include "Inode.h"
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#include "assert.h"
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#include "VirtualFileSystem.h"
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#include "PathWalker.h"
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Path::Path(Dentry* dentry, VfsMount* mnt) :
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dentry_(dentry), mnt_(mnt)
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{
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}
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bool Path::operator==(const Path& other) const
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{
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return ((dentry_ == other.dentry_) && (mnt_ == other.mnt_));
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}
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Path Path::parent(const Path* global_root) const
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{
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debug(PATHWALKER, "Walk up to parent dir\n");
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assert(dentry_ && mnt_);
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if(isGlobalRoot(global_root))
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{
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debug(PATHWALKER, "Reached global file system root\n");
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return *this;
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}
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if(isMountRoot())
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{
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debug(PATHWALKER, "File system mount root reached, going up a mount to vfsmount %p, mountpoint %p %s\n", mnt_->getParent(), mnt_->getMountPoint(), mnt_->getMountPoint()->getName());
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return Path(mnt_->getMountPoint()->getParent(), mnt_->getParent());
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}
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return Path(dentry_->getParent(), mnt_);
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}
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int Path::child(const ustl::string& name, Path& out) const
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{ // Warning: out parameter may refer to this object!
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debug(PATHWALKER, "Walk down to child %s\n", name.c_str());
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assert(dentry_ && mnt_);
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VfsMount* child_mnt = mnt_;
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Dentry *child_dentry = dentry_->getInode()->lookup(name.c_str());
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if(!child_dentry)
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{
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debug(PATHWALKER, "Error: No child dentry %s\n", name.c_str());
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out = Path();
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return PW_ENOTFOUND;
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}
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#ifndef EXE2MINIXFS
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VfsMount* vfs_mount = vfs.getVfsMount(child_dentry);
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if (vfs_mount != 0)
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{
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debug(PATHWALKER, "Reached mountpoint at %s, going down to mounted file system\n", dentry_->getName());
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assert(child_dentry->getMountedRoot() == vfs_mount->getRoot());
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child_dentry = vfs_mount->getRoot();
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child_mnt = vfs_mount;
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}
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#endif
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out = Path(child_dentry, child_mnt);
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return PW_SUCCESS;
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}
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ustl::string Path::getAbsolutePath(const Path* global_root) const
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{
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if(isGlobalRoot(global_root))
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{
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return "/";
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}
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else if(isMountRoot()) // If this is a mount root, we want the name of the mountpoint instead
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{
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return parent().getAbsolutePath() + mnt_->getMountPoint()->getName();
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}
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else if(parent().isGlobalRoot()) // Avoid adding '/' twice
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{
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return parent().getAbsolutePath() + dentry_->getName();
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}
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else
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{
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return parent().getAbsolutePath() + "/" + dentry_->getName();
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}
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}
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bool Path::isGlobalRoot(const Path* global_root) const
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{
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return (global_root && (*this == *global_root)) ||
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(isMountRoot() && mnt_->isRootMount());
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}
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bool Path::isMountRoot() const
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{
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return dentry_->getParent() == dentry_;
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}
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