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Kernel/Ext2FS: Don't hog both locks in Ext2FSInode::lookup()

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This function was acquiring both the inode and file system locks (in
that order) which could lead to deadlocks.
This commit is contained in:
Andreas Kling 2021-07-15 23:54:48 +02:00
parent 9d7e391f94
commit ace8b9a0ee
1 changed files with 12 additions and 6 deletions
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18
Kernel/FileSystem/Ext2FileSystem.cpp
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@ -1623,12 +1623,18 @@ RefPtr<Inode> Ext2FSInode::lookup(StringView name)
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]:lookup(): Looking up '{}'", identifier(), name);
if (populate_lookup_cache().is_error())
return {};
Locker locker(m_lock);
auto it = m_lookup_cache.find(name.hash(), [&](auto& entry) { return entry.key == name; });
if (it != m_lookup_cache.end())
return fs().get_inode({ fsid(), (*it).value });
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]:lookup(): '{}' not found", identifier(), name);
return {};
InodeIndex inode_index;
{
Locker locker(m_lock);
auto it = m_lookup_cache.find(name.hash(), [&](auto& entry) { return entry.key == name; });
if (it == m_lookup_cache.end()) {
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]:lookup(): '{}' not found", identifier(), name);
return {};
}
inode_index = it->value;
}
return fs().get_inode({ fsid(), inode_index });
}
void Ext2FSInode::one_ref_left()